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Open Access Article
1 - Simulating the Production Line of Reinforcement Bars and Determining the nondominant Solutions for the Number of Cranes
Mohammadali Afshar Kazemi Mahmoud Alborzi Shadi MahjoubraveshIn this research, it has been attempted to model the production line of reinforcement barsusing discrete simulation modeling to determine the number of cranes required, considering therelevant factors such as, production line speed, failure rates of each machine and the MoreIn this research, it has been attempted to model the production line of reinforcement barsusing discrete simulation modeling to determine the number of cranes required, considering therelevant factors such as, production line speed, failure rates of each machine and the spacerequirement. To achieve this, the production process was first investigated and an appropriatesimulation model was formulated using the Enterprise Dynamics (ED) simulation package. Therelevant data were then collected for each entity through time study. The sample size and thestatistical distributions were identified. To check for model validation, the simulation resultswere compared with actual data using statistical tests. To determine the desired number ofcranes and improve the production line performance, three indices i.e. output rate, productivityfactor and mean waiting time were determined through expert opinion and eight differentlayouts were constructed as alternatives considering the space constraint. All three indices weredetermined through simulation taking a reproducible approach. The weights of the criteria werecomputed using the Entropy technique and the alternatives were ranked using the TOPSISmethodology Manuscript profile -
Open Access Article
2 - The dynamics of plasmoid instability in the presence of asymmetric parallel shear flow.
Hossein Lotfi Mahboub Hosseinpour -
Open Access Article
3 - Effect of long-rang interactions on the Kosterlitz-Thouless transition
Yazid Benbouzid Slimane Chala Mostefa Maache -
Open Access Article
4 - Investigation of the optimal material type and dimension for spallation targets using simulation methods
Seyed Amir Hossein Feghhi S. A. H. Feghhi Zohreh Gholamzadeh C. Tenreiro Claudio Tenreiro -
Open Access Article
5 - Influence of the inlet gas velocity components on the survival of the vertex of gas in the plasma torch
M. Gharaeinia S. Saviz A. H. Sari -
Open Access Article
6 - Time-dependent one-dimensional simulation of atmospheric dielectric barrier discharge in N2/O2/H2O using COMSOL Multiphysics
F. Sohbatzadeh H. Soltani -
Open Access Article
7 - A parametric study on the PD pulses activity within micro-cavities
Alireza A. Ganjovi -
Open Access Article
8 - Estimation of photo-degradation of dielectrics surrounding the narrow channel due to PD activity
Alireza A. Ganjovi -
Open Access Article
9 - One-dimensional simulation of hydrogen production kinetic models by water vapor plasmolysis in a DBD plate reactor
Mostafa El-Shafie Shinji Kambara Yukio Hayakawa -
Open Access Article
10 - Micromagnetic analysis of Heusler alloy-based perpendicular double barrier synthetic antiferromagnetic free layer MTJs
Bahniman Ghosh Kshitij Dwivedi -
Open Access Article
11 - The new wave-ring helical (WRH) slow-wave structure for traveling wave tube amplifiers
Nasser Panahi S. Saviz M. Ghorannevis -
Open Access Article
12 - Thematic Analysis of Lifestyle in SIMS (Video Game)
Behrouz Minaei Seyed Mohammad Ali Seyed HosseiniThis Article studies a simulated lifestyle in “The SIMS 3” which is one of the best seller computer games. The Research’s aim is identifying simulated model of life in this video game which was developed in Simulation genre. According to differences wh MoreThis Article studies a simulated lifestyle in “The SIMS 3” which is one of the best seller computer games. The Research’s aim is identifying simulated model of life in this video game which was developed in Simulation genre. According to differences which exist in the nature of digital games (a type of interactive media) and mass media, in this article two qualitative methods were used to approach research’s aim. The two qualitative methods were “participant observation” and “thematic analysis”. The article argues that “The SIMS 3” is a simulation of consumption-oriented lifestyle in which consumption has more semiotic value than it’s functional and exchangeable values. Manuscript profile -
Open Access Article
13 - Assessing energy performance of simulation-powered internal sun shading devices for residential buildings in Tehran
Alireza Karimpour darab diba Iraj EtesamSustainable development as a process for meeting human development goals while sustaining the ability of natural systems to continue to provide the natural resources has an undeniable impact on all aspects of human life. Energy efficiency is an essential factor for sust MoreSustainable development as a process for meeting human development goals while sustaining the ability of natural systems to continue to provide the natural resources has an undeniable impact on all aspects of human life. Energy efficiency is an essential factor for sustainable development and in spite of worldwide climate change problems caused by fossil fuel use, energy consumption levels in Iran, while already high, continues to rise each year. About 40% of energy consumed by the residential buildings in this country is fossil fuel-derived. Therefore providing solutions to reduce energy consumption in this sector is very important. Tehran is largest city of Iran, and significant amounts of energy are consumed in these city. However, due to its location in semi-arid climatic region, high sun’s radiation even in winter and low relative humidity of the air, this city has a high potential for energy conservation in residential buildings. Therefore the introduction of energy efficient buildings in this city would have a significant overall impact on national energy consumption levels. Sun shading devices are one of the most efficient elements to manage the interaction between the interiors and exteriors of buildings. They can significantly reduce cooling loads, improve thermal comfort, prevent the heat loss in the winter and reduce potential glare problems in residential buildings. Sun shading devices can be categorized according to their placement as interior, exterior and mid-pane. Result of research and studies shows that the effectiveness increase 35% by using outside shade protection instead of inside one. This research is aware of this fact that optimized internal sun shading devices are not comparable with the external sun shading devices in efficiency and performance. Although due to the increased utilization of them in the residential buildings, this research studied the internal sun shading devices and determined the optimized internal sun shading system, and then analyzed its effect on the energy consumption in the residential building model. In this study at the first phase, the combination of four types of internal sun shading devices with three types of windows are evaluated by the Parasol simulation software to determine the optimized internal sun shading system. Simulations show that the double glazed transparent window with dense reflective Roller Blind (as optimized sun shading system), has most appropriate thermal behavior. At the next step, a building model as a case study (The six-story apartment in the city of Tehran) was considered for simulations of energy consumption. The Building Calc. software was applied for energy simulations and heating, cooling and total energy consumption of building was calculated with and without optimized internal sun shading system. The result shows that efficiency of internal sun shading devices increase by using dense texture, high reflectance and low transfer rate. Also only by using optimized internal sun shading system reduce energy consumption of residential buildings in Tehran up to 14%. Because of the large coordination with Iran’s economic, cultural and social conditions this method could be one of the best solutions to reduce the energy demand in residential buildings. Manuscript profile -
Open Access Article
14 - Wind tunnel flow simulation and aerodynamic shape optimization of tall buildings to improve the drag coefficient under wind forces
Abdollah Baghaei Daemei seyed rahman eghbali Hossein Moez Payam BahramiAerodynamic behavior is an important characteristic of tall and ductile buildings, so aerodynamic design can play a key role in reducing the wind effects. A tall building response to wind can be controlled by application of aerodynamic improvements to building’s d MoreAerodynamic behavior is an important characteristic of tall and ductile buildings, so aerodynamic design can play a key role in reducing the wind effects. A tall building response to wind can be controlled by application of aerodynamic improvements to building’s design in order to manipulate the wind flow pattern and break the effective wind force acting on the structure. Traditionally the approach of structural engineers to mitigating wind loading and associated deflections and motions on tall buildings was to stiffen the building with the aim of increasing the natural frequency. Tall buildings are extremely sensitive to the wind. Thus, assessment of wind loads to design these buildings is essential. Monitoring the wind, which is forcing extraordinary tall buildings, is highly challenging. Due to increasing construction in recent decades, the study on wind flow over tall buildings has become a popular subject in theoretical research and applied engineering applications. By looking at recent constructions in Iran, it is obvious that despite the fact that constructing tall buildings is spreading, there is less concentration on environmental factors such as the wind’s aerodynamic. In tall buildings, aerodynamic behavior generally becomes important. The wind-induced building response of tall buildings can be reduced by means of aerodynamic from design and modifications that change the flow pattern around the building or break up the wind affecting the building face. Aerodynamic-based design can be divided into two types, “aerodynamic architectural design” and “aerodynamic architectural modifications” and their subgroups. The accurate estimation of the critical response parameters, such as top floor accelerations and displacements, is of fundamental importance when ensuring reliable designs of tall buildings. Methods to this end are typically set in a modal analysis framework and therefore require the estimation of the generalized forcing functions. Tall buildings are particularly prone to dynamic excitations such as those from natural disasters like strong winds and earthquakes, and this has become an especially important design issue. One way to minimize wind-induced vibrations of tall buildings is to focus more on their shapes in the design stage. Investigated aerodynamic forces and wind pressures acting on tall buildings with various unconventional configurations. The proposed of this research, investigation of aerodynamic shape optimization on tall buildings in order to reduce drag force. The aerodynamic forms such as a set-back, tapered and helical (twisted) and also aerodynamic modifications such as a chamfered corner, rounded corner and recessed corner to control and reduce wind forces and vortices on tall buildings are considered. On this basis, the study was carried out with numerical simulation of wind tunnel test on 29 building models. In order to construct 3D models, AutoCAD 2014 software was deployed and also to numerically simulate wind tunnel Autodesk Flow Design 2014 is used. Building samples were entered into the software via format FBX. The results showed that for a tall building with a triangular footprint and height of about 150 meters, base shape with chamfered corners of aerodynamic modification and tapered of aerodynamic form can have the best aerodynamic behavior against wind forces. Manuscript profile -
Open Access Article
15 - Economic Analysis and Assessing Energy Performance of Simulation-Powered Optimal Window Type and Window to Wall Ratio for Residential Buildings in Tehran
Alireza Karimpour Darab Diba Iraj EtessamToday, with the rapid depletion of fossil energy sources and increasing of environmental problems, supervision and management of energy consumption becomes more important. Looking at the breakdown of energy consumption by sectors, the buildings sector is seen as one of MoreToday, with the rapid depletion of fossil energy sources and increasing of environmental problems, supervision and management of energy consumption becomes more important. Looking at the breakdown of energy consumption by sectors, the buildings sector is seen as one of the priority areas. About 40% of energy consumption of the residential buildings in Iran is fossil fuel-derived. In recent years, housing units increased significantly in Tehran as the largest and most populous city of Iran and targeted subsidies policy is implemented and energy costs have gone up. Therefore providing solutions to reduce energy consumption in this sector is very important. Windows are one of the most important components of building thermal coating that affect the energy efficiency and environmental thermal comfort. It is obvious windows play a critical role in saving energy because about 30% of the total energy loss occurs through them. Therefore the evaluation of the optimal window type and window to wall ratio in the first phase of architectural design, plays an important role in the energy efficiency and improving the quality of indoor environment. The main objective of this paper is to present an approach that provides assistance for designers to select optimal ratio of window to wall for residential buildings concerning economic analysis that affect this assessment. In this research, a building model as a case study (the six-story apartment in the city of Tehran) is considered and then its energy consumption optimized via simulation software. Based on the simulations, two optimization parameters, window to wall ratio and type of windows, are evaluated. In this regard, at the first phase, four types of window glazing with same size in four main orientations and a window to wall ratio of 5 to 55% on residential building was simulated to determine the optimized window to wall ratio through evaluating of energy consumption. At the next step, optimized windows in three directions was considered on building model for simulations of energy consumption and then optimized windows in terms of energy efficiency was identified. Finally, for economic analysis of the use of optimal windows, a newly designed building that uses the optimal window is economically compared to a house that is architecturally and structurally similar to existing buildings and has more energy consumption. The energy costs, payback period and internal rate of return of these two buildings are compared to find the economical differences. The results show that energy consumption of residential buildings in Tehran reduced up to 20/3% only by using high performance windows and optimum wall to window ratio. It can be concluded that the influence and sensitivity of window-wall ratio on the total energy consumption are related to the orientation of outside window, and the glazing types of window. The window orientations could be prioritized in the following order: south, east, west, and north. Also according to the current price of fuel in Iran and the 17/8 years payback period that Obtained from economic analysis, the additional initial cost will be offset by the proposed policies. Manuscript profile -
Open Access Article
16 - Sensitivity Analysis of Constructional Specifications on Thermal Performance of Naturally Ventilated Box Window Double Skin Facade in Hot Arid Climate of Iran (Tehran)
Faryal sadat Siadati Rima Fayaz Nilofar NikghadamThe function of the double-skin facade with natural ventilation is based on the thermal performance and airflow of the cavity. Structural features of a naturally ventilated double-skin façade that affect its thermal performance and fluid dynamics include geometri MoreThe function of the double-skin facade with natural ventilation is based on the thermal performance and airflow of the cavity. Structural features of a naturally ventilated double-skin façade that affect its thermal performance and fluid dynamics include geometric features such as cavity dimensions, airflow path, air inlet, and outlet areas, shading devices material and their location in the cavity, and material properties that are optical and thermal characteristics of transparent skin. In this research, Fluent Software was used to simulate the computational fluid dynamics, and by sensitivity analysis, the effect of changes in structural properties on thermal performance was evaluated. For this aim, 144 simulation scenarios with cavity depths of 30, 60, 90, and 120 cm, inlet and outlet cross-sections of 0.2, 0.4, and 0.8 m2, louver shadings with 0, 30, 45, 60, and 90 degree angles located at one third distance close to the exterior wall of the façade, the model without shading, exterior glass with regular and low emission layer were investigated, and the following results were obtained:- Cavity Depth: It was observed that as the depth increases, the velocity of airflow in the cavity decreases. Changing the width of the hole changes the surface temperature of the inner glass up to a maximum of 0.80 ° C (up to 2%). As the depth of the cavity increases, the heat flux transmitted through the inner glass surface decreases in most cases (up to 6.5%).- Cross-section: As the cross-section increases, the air velocity in the cavity increases the temperature of the inner glass surface changes irregularly but, in most cases, decreases. In addition, the heat flux passing through the inner glass surface often increases (up to a maximum of 16.3%).- Shading: In the case without shading, the air velocity in the cavity is 0.30 to 0.70 m/s, and in the case with 45 degrees of shading, the air velocity in the cavity is between 0.30 and 0.92 m/s. In the case without shading, the temperature of the inner glass surface changes from 39.3 to 41.0 ° C, and in the case with 45 degrees, changes are between 38.65 to 39.5 ° C. In the case without shading, the heat flux transmitted through the inner glass surface changes from 78.0 to 120.0 W/m2, and in the case with 45 degrees shading, differences between 43.0 to 48.2 W/m2. The sensitivity of the heat flux transmitted through the inner glass surface to the presence or absence of shading can lead to a reduction of the heat flux transmittance through the inner glass surface by up to 61.0%.- Exterior glass type of DSF: In the case without shading, the reduction rate of heat flux from the inner glass surface is 19.44% to 29.78%, and in the case with 45-degree shading is from 17.71% to 24.44%. By changing the exterior glass's material (low emission or regular), the heat flux transmitted through the inner glass surface changes by 32.2 and 120 W/m2. Manuscript profile -
Open Access Article
17 - The Role of Daylight within the Vault of Shahrak-e-Gharb Jame Mosque in Tehran
Seyed Hesamodin Tabibian Farah Habib Seyed Amir Hosein Garakani -
Open Access Article
18 - Campus Wind Environment Evaluation (Case Study: North China University of Technology)
Biao WANG Shuai SUN Ying LI Yuxin HOU Yaning XIE Yuyao REN Qiutong JIN -
Open Access Article
19 - Measuring The Quality of Natural Lighting in A Building with Double Skin Façade (DSF)
A. E. Manubawa LMF Purwanto A. Ardiyanto -
Open Access Article
20 - Investigating the wind-induced effects on Tall Buildings to reduce Drag Coefficient through Large Eddy Simulation (LES)
Najmeh Mastari Farahani Abdollah Baghaei Daemei Payam Madelat Seyedeh Maryam Abbaszadegan -
Open Access Article
21 - Proposing a New Approach to Optimize the Windcatcher's Performance
Mansoureh Tahbaz مونا محتاج Atefeh Dehghan Touran PoshtiHot and humid climate is one of the robust climates in the world. Vernacular architecture in this area answer to climate conditions with solutions, one of these solutions are windcatchers. Nowadays most of these windcatchers are closed because they are not responsive to MoreHot and humid climate is one of the robust climates in the world. Vernacular architecture in this area answer to climate conditions with solutions, one of these solutions are windcatchers. Nowadays most of these windcatchers are closed because they are not responsive to current thermal comfort conditions. The reduction of wind speed and the lack of control over the entering hot weather can be considered as two main weaknesses of the windcatchers in these areas. This research suggested to install Damper and Fan to improve the performance of windcatchers in vernacular houses of Bandar-Kong. five windcatchers have been selected as case studies and their performance has been simulated and measured in 24 different modes: open windcatcher (past method), closed windcatcher (current state), windcatcher with valve and windcatcher with fan are four general modes wich are divided to 6 subset. Design Builder 7.0.0.116 is used for simulations. operative temperature is calculated for each space in 24 different modes. The results show that using fan and damper, increase thermal comfort hours from about 43 to 52 percent. Besides using fans and dampers can obviously reduce temperatures over 35degrees. Manuscript profile -
Open Access Article
22 - Explaining the Methods of Architecture Representation Using Semiotic Analysis (Umberto Eco's Theory of Architecture Codes)
Seyed Mojtaba Shojaee Seyed Ali Akbar Saremi -
Open Access Article
23 - Studying the Thermal Behavior of Winter Sections in Yazd Traditional Homes and Its Optimum Situation
Mohammad Kazemi A.Reza Mahmoodabadi -
Open Access Article
24 - Classical and Bayesian inference based on progressive type-II hybrid censored data from the Poisson-Exponential distribution
masoumeh mohammadi monfared Mohammad Hassan Behzadi reza arabi belaghiIn this paper, the problem of estimating unknown parameters is investigated when lifetime data following Poisson-exponential distribution under classical and Bayesian frameworks based on progressively type-II hybrid censored data. We compute point and associated interva MoreIn this paper, the problem of estimating unknown parameters is investigated when lifetime data following Poisson-exponential distribution under classical and Bayesian frameworks based on progressively type-II hybrid censored data. We compute point and associated interval estimates under classical and Bayesian approaches. For point estimates in the problem of estimation, we compute maximum likelihood estimators of model using Expectation-Maximization (EM) and Stochastic Expectation-Maximization (SEM) algorithms under classical approach, these algorithms are easily implemented. We compute Bayes estimates with the help of Lindley and importance sampling technique under informative and non-informative priors using different loss functions namely squared error, LINEX as well as general entropy in Bayesian framework. The associated interval estimates are obtained using the Fisher information matrix and Chen and Shao method respectively under classical and Bayesian approaches. We analysis real data set, and conduct Monte Carlo simulation study for the comparison of various proposed methods. Finally, we present a conclusion. Manuscript profile -
Open Access Article
25 - Simulation and optimization model of the Signoff units in order to increase the logistic productivity and reduce the production and quality costs: A Case Study in Saipa Automotive Company
mohammad sarvar masouleh amir AziziIn the present research, an optimization process was performed in Signoff unit of Saipa Corporation based on the discrete event simulation using a multiple objective function. The required information, including the operation classes (product inspection, adjustment, and MoreIn the present research, an optimization process was performed in Signoff unit of Saipa Corporation based on the discrete event simulation using a multiple objective function. The required information, including the operation classes (product inspection, adjustment, and reworking), the flow between different workstations, operation times, production cost identification, etc., were extracted from the actual data recorded for March 2018- March 2019 period. For the purpose of simulation, firstly, the model was built using the Arena software and all effective parameters and variables were introduced into the model following the planning of various scenarios. Upon a predetermined number of iterations, the bottleneck was identified and the model was verified. Next, in a primary phase, the OptQuest software was utilized to find the optimal number of workers for minimizing the production costs after 378 iterations (upon satisfaction of an automatic stop criterion), and the result was used as input for a secondary phase where the model was optimized for enhancing the operational capacity of the logistic units upon 303 iterations. Using the results of this research, it was anticipated to achieve 21.6% drop in the number of Operator along with 10% increase in the logistic capacity, 4% reduction in the production costs, and 2% increase in the production rate. Manuscript profile -
Open Access Article
26 - Simulating and Forecasting OPEC Oil Price Using Stochastic Differential Equations
R. Farnoosh P. Nabati M. AziziThe main purpose of this paper is to provide a quantitative analysis to investigate the behavior of the OPEC oil price. Obtaining the best mathematical equation to describe the price and volatility of oil has a great importance. Stochastic differential equations are one MoreThe main purpose of this paper is to provide a quantitative analysis to investigate the behavior of the OPEC oil price. Obtaining the best mathematical equation to describe the price and volatility of oil has a great importance. Stochastic differential equations are one of the best models to determine the oil price, because they include the random factor which can apply the effect of different economical and political elements .In order to earn the best model, at first we study the effectiveness of different stochastic differential equations models and then using the daily OPEC oil price in years 2003 to 2016, according to the high oscillation of oil price due to the various economical and political creases, we divide the data to four parts and estimate the unknown parameters of the equations in these time periods using the General Method of Moment. At last, the best model can be defined by attention to the main price chart and numerical simulations. Manuscript profile -
Open Access Article
27 - Utilizing Monte Carlo Method for Ranking Extreme Efficient Units in Data Envelopment Analysis
Gh-R .Jahanshahloo M. Zahedi-SereshtData envelopment analysis (DEA) is a mathematical programming method for calculatingefficiency of decision making units (DMU). In calculating the efficiency score of unitsthrough DEA we may come up with some efficient units. But the question is among theseefficient unit MoreData envelopment analysis (DEA) is a mathematical programming method for calculatingefficiency of decision making units (DMU). In calculating the efficiency score of unitsthrough DEA we may come up with some efficient units. But the question is among theseefficient units which of them is better. As we know, it is possible to rank inefficient unitsthrough efficiency score; however, for ranking efficient units it is not helpful and othermethods should be developed in these regards. To obviate this problem there have been somany attempts in the literature which have their pros and cons. Cross-efficiency method wasfirst introduced by Sexon et al. for ranking efficient units. The major problem of this methodis alternative optimal solutions in each model which must be solved for each DMU. Anotherproblem of this method is dependency of obtained solutions on the solution obtained by otherunits. Another method which has widely been used is super efficiency, presented byAnderson and Petersen. There are several flaws in their suggested method. Infeasibility,instability, dependency of the model on the input and output orientation and non-zero slackvariables are the weaknesses of this method which may occur in specific problems. Thisarticle is an attempt to present a method which does not have the aforementioned problemsand can be utilized to calculate the rank of extreme efficient units through using the Hit orMiss Monte Carlo method. At the end of the article some examples are made in order to showthe efficiency of the presented method. Manuscript profile -
Open Access Article
28 - Measures for the Development and Education of Humanitarian Law in Iran
مهدی ZakerianIranian society has always shown a special interest inlearning human rights and humanitarian law. In this regard,examples abound as follow: pursuing charity activities,establishment of the Iran’s Red Crescent Society and itspredecessor, ratification of four Geneva MoreIranian society has always shown a special interest inlearning human rights and humanitarian law. In this regard,examples abound as follow: pursuing charity activities,establishment of the Iran’s Red Crescent Society and itspredecessor, ratification of four Geneva Conventions andthe Additional Protocols, etc. This fact along with the politicaland economic characteristics of the Middle East increase thesignificance attached to the development and education ofhumanitarian law in Iran. In this context, the main question ofthe research would be how the education of humanitarian lawcan be expanded and institutionalized in Iran. To answer theaforementioned question, the authour offers the hypothesisthat informal education is of more efficiency in training andinstitutionalizing the humanitarian international law in Iran. Healso applies the instruments of observation, experimentation andthe survey of research findings in the field of humanitarian law inIran in order to test the hypothesis. He examines and comparesthe modern texts on the formal and informal education ofhumanitarian law, and modern methods of tranining humanitarian law with the informal traditional education of humanitarian law inthe country Manuscript profile -
Open Access Article
29 - Survey on the Fisibility of Substitution Catastrophe Securitization and Current Reinsurance in Iranian Insurance Industry
Kambiz Peykarjou hanieh davodiAfter 2004, Alternative Risk Transfer (ART) has been more popular in the Litriture of Financial Economics & Financial Management. For using ART, many Researches Pursue Resolution, which Minimize Claims of this Catastrophe, through Risk Distribution Cycle, or if any MoreAfter 2004, Alternative Risk Transfer (ART) has been more popular in the Litriture of Financial Economics & Financial Management. For using ART, many Researches Pursue Resolution, which Minimize Claims of this Catastrophe, through Risk Distribution Cycle, or if any Profitability, find Subsititutions of ART; such as Insurance. However, we study about this, by Estimating Nnon-linear relation between Claims of Catastrophe and Insured Risk Capitals(IRC), Accounting Loss Distribution Function(LDF), given Historical Data(HD) & using Monte Carlo Simulation(MCS) and then, Stimating Value at Risk(VaR) of Conditional Loss Distribution Function of Catastroph(CLDFC), which has almost Optimal Profitability. Manuscript profile -
Open Access Article
30 - Combined Application of State Space in ARIMA Form Model and Monte Carlo Simulation Method to Forecast TEPIX Index
Aghigh Farhadi Farhad GhaffariIn this study, we estimated the parameters using the State Space model described inARIMA form. We’ve also used the Monte Carlo Method for simulating the process in10000 reputations. Then the estimated parameters and the Monte Carlo simulationmethod are used to for MoreIn this study, we estimated the parameters using the State Space model described inARIMA form. We’ve also used the Monte Carlo Method for simulating the process in10000 reputations. Then the estimated parameters and the Monte Carlo simulationmethod are used to forecast TEPIX index, including 739 observations as an in-sampledata from 21th of January 2011 to 19th February 2014 and 59 observations from 20thFebruary 2014 to 21th May 2014 as an out of sample data . Furthermore, For moreinvestigation we’ve considered different horizons of forecasting, short-term (equal to 1week), mid-term (equal to 1 month) and long term (equal to 3 month). The results showedthat Tehran stock market data has enough efficiency to forecast them, and showed that theState Space in Form ARIMA model and the Monte Carlo simulation method can be usedas a predictive algorithm for TEPIX index and other indices with similar nature. Manuscript profile -
Open Access Article
31 - Risk Analysis & Financial Evaluation in Power Plant BOT
Faramarz Nouri Parastoo Mohammadi Esmaeil VassafThe aim of this thesis is identifying and modeling the risks of the power plant BOTprojects. Main identified risks in this study are project financing risk(equity ratio risk)and the risk of revenue of project. In order to model the risks, we used the MartingaleVariance MoreThe aim of this thesis is identifying and modeling the risks of the power plant BOTprojects. Main identified risks in this study are project financing risk(equity ratio risk)and the risk of revenue of project. In order to model the risks, we used the MartingaleVariance Model (MVM) for the revenue risk and the Triangular distribution function forthe equity ratio risk. We applicated the Monte Carlo simulations method for obtainingthe probability distribution function and critical values of the decision index (Net PresentValue, Internal Rate of Return, Debt Service Coverage Ratio). The one of thermal powerplant projects data prepared by MAPNA, has been implemented in this study. The resultsof the simulation indicate that the risk of negative NPV of project is 13.41 percent and therisk of DSCR lower than 1.2 is 8.65 percent. Therefore, the sponsors suffering more risksthan lenders in the studied project. Manuscript profile -
Open Access Article
32 - The Effect of Selecting the Type of Objective Function on Individual Default in Individual Retirement Account (Case study: Iran)
Ezatollah Abbasian Mohammad Ali Kamali Reza Tehrani Mojtaba MirlohiA retired person faces two major risks: life-long risk and investment risk. In this paper, we examine the effect of decision-making policy on the amount of defaults by using two objective functions for wealth at retirement time. The expressed policies relate to the retu MoreA retired person faces two major risks: life-long risk and investment risk. In this paper, we examine the effect of decision-making policy on the amount of defaults by using two objective functions for wealth at retirement time. The expressed policies relate to the return on target markets for investment and the discount rate in the economy. In the modeling of these policies, a dynamic programming approach combined with historical simulation has been used. The results indicate the importance of selecting the objective function. Given the severe economic fluctuations in the country, as well as the need for greater wealth accumulation and greater participation in controlling economic fluctuations, the policy of focusing on pension with the lower wealth in retirement period as an optimal policy - because of the acceptance of lower risk for a certain level of wealth - and more use of the wealth function during retirement time is suggested. Manuscript profile -
Open Access Article
33 - A dynamic modeling of future pricing for investment asset with known income
Reza Tehrani Amirali Abbaszadeh Asl masoud FekriThere are different ways of system analysis. System thinking is a novel and very effective method in this field. Actually, system dynamic approach offers a dynamic model of a process in the real world and systematically analyzes related factors. In other words, it indic MoreThere are different ways of system analysis. System thinking is a novel and very effective method in this field. Actually, system dynamic approach offers a dynamic model of a process in the real world and systematically analyzes related factors. In other words, it indicates the influence of changes on each effective factor on the entire system in each moment. In this paper, primarily, a dynamic model is proposed by investigating different effective factors on future price of assets which include known income and the way of arbitrage opportunities with non-correct prices are simulated. Thus, scenarios are offered to illustrate the changes of different effective factors on system and arbitrage opportunities made as a result to these changes Manuscript profile -
Open Access Article
34 - Assessing the Efficiency of the Value-at-Risk Index (VAR) using Extreme Value Theory in comparison with traditional risk assessment methods
Mehrdokht Mozaffari Hashem NikoomaramGenerally, the greatest risk in the capital market or in the portfolio of investors occurs when large sudden changes occur in the unfavorable portfolio. These losses are in the distribution sequence, and for this purpose they are called "limitative values". In this rese MoreGenerally, the greatest risk in the capital market or in the portfolio of investors occurs when large sudden changes occur in the unfavorable portfolio. These losses are in the distribution sequence, and for this purpose they are called "limitative values". In this research, the logarithmic efficiency of the Tehran Stock Exchange Index based on the information received during the time interval between the day (due to the use of high frequency data) during the years 1392 to 1395, and the use of the maximum block approach in measuring the VaR value index is used. It turned out VaR index was calculated using historical simulation methods and variance-covariance method as the traditional risk assessment criteria and the results were compared. The results of data analysis in R software showed that the use of monthly information in calculating the risk-weighted value index has a higher predictive accuracy and the error rate (test error) in this case is lower than traditional risk assessment methods. Manuscript profile -
Open Access Article
35 - Provide a product life Cycle Optimization Model Using Agent Based Simulation
mohammad farahbakhsh mahmod modiri seyed mohammad ali khatami firozabadi alireza Puorebrahimi -
Open Access Article
36 - Optimum Staff Leveling of Hospital Emergency Department Using a Simulation Based Approach
Amir Hossein Khoshbin mohamad mhdi sepehri Sedigh RaissiIntroduction: Allocation of human resource properly can have an effective role in the hospital emergency departments cost performance. This research has been conducted to provide the optimal solution on staff leveling for emergency department of hospitals. Methods: This MoreIntroduction: Allocation of human resource properly can have an effective role in the hospital emergency departments cost performance. This research has been conducted to provide the optimal solution on staff leveling for emergency department of hospitals. Methods: This research is an applied research and deploys from analytic analysis. The population of study include patients referred to a given emergency department on Imam Reza Hospital in Tabriz at a period of three months in 1393. After analyzing the current patient workflow, required data concerning the patients’ inter-arrival time, cycle times in different stations gathered for 900 patients during three weeks. Based on such data, simulation models designed using the Arena software features and finally the model verified and validated. Then proposed linear programming model based on minimizing patients’ average stay time, helped to calculate optimum staff leveling. Results: Result of sensitivity analysis on DTDT, show that if operational budget of emergency department increased 10%, 20%, 30%; The LOS leads to 359,337,308 minutes. In the lower budget, this correlation is apparent and significant. Conclusion: Simulation results revealed that increasing on the number of physicist has the most priority on extra investment. Also, the proposed simulation model helped the operating managers to get more sense on the effects of the relevant controllable factors to total efficiency on the emergency department; in simulated framework, without operational experience, examine intended scenarios and comparing results then select best solutions. Manuscript profile -
Open Access Article
37 - A Study on the Organizational Output by Concluding Break Even-Point through the Application of Matlab Simulink Method
P. Aswal M. Kumar A. Gupta -
Open Access Article
38 - A Simulation Based of Setting Policy in Project Acceptance Based on Experiences in Project-Driven SME's
S. Izadin R. Radfar J. Nazemi -
Open Access Article
39 - The effect of management accounting teaching by role-playing simulation on students' learning and retention
vahideh tabibirad zahra dianati reza gholami Reza Gholami Jamkarani Hossein AbbasianIn recent years, a significant number of Scientific and professional accounting authorities (such as IFAC, CPA, ICAA, AECC) have called for the development of a wide range of skills in accounting graduates and the diversification of a holistic approach to teaching MoreIn recent years, a significant number of Scientific and professional accounting authorities (such as IFAC, CPA, ICAA, AECC) have called for the development of a wide range of skills in accounting graduates and the diversification of a holistic approach to teaching. The aim of this study was to investigate the effect of simulation teaching l approach through role-playing as a comprehensive teaching method on students' learning and retention, while teaching concepts related to decision making in management accounting. The population of the present study includes all students (undergraduate) of Management Accounting of Islamic Azad University, Saveh Branch in the academic year of 2020-2021 and the samples include two management accounting groups of 60 students (31 in the experimental group and 29 in the control group). The two groups are taught by a single teacher. Findings indicate that students in the experimental group learn and remember better than the control group. Also, the results of a survey of students (through a questionnaire) at the end of the course showed an increase in motivation and effectiveness of this teaching l method in strengthening their verbal and communication skills and better learning the basic concepts of management accounting. Manuscript profile -
Open Access Article
40 - Developing a New Dynamic Model for Art full Waste Management
محسن قدمی میترا آفتاب آذری مینا قدمیIntroduction and Research Objectives: The aim of this study is considering moral and intellectual human dimensions as one of the essential components to reach art full development. For this purpose, according to zero based theory induced by natural and living system MoreIntroduction and Research Objectives: The aim of this study is considering moral and intellectual human dimensions as one of the essential components to reach art full development. For this purpose, according to zero based theory induced by natural and living systems cycle, we consider three cycles of production, distribution and usage and then articulate the behavior of variables affecting human development in a non ‐linear and dynamic space and therefore remind system managers and regulators of their roles. Method: This study is a theoretical‐applied research and its methodology, regarding subject and goals, is of cause and effect kind and its implementation is rather nonlinear mathematical modeling. In execution, the research method is a combinational method Results: In dynamic model, the sensitivity of subsidiary and fixed variables were analyzed by considering their cause ‐effect relations and the most sensitive one was identified. Considering the model, one can find that : a) In production process, the most important damages affecting on intellectual human dimensions are weak knowledge management, lack of capacity management, inefficiency of supervising system and distrust (prejudice), lack of pluralism, lack of comprehensive theory on health and weak policymaking; b) In distribution process, the most important damages affecting on intellectual human dimensions are unilateral transfer of information, Censorship, lack of financial support, lack of transparency, lack of capacity management, inefficiency of social security coverage system and offense; c) In usage process, the most important damages affecting on intellectual human dimensions are lack of motivation (no motivation), personal and mental causes and social cynicism. In spite of being distinguishable, behaviors are never similar and it is impossible to exactly specify their details. As behaviors are rather qualitative than quantitative In order to give a primary prediction, it is necessary to use non ‐linear planning and computer simulation to identify qualitative patterns and behavior as a whole. Manuscript profile -
Open Access Article
41 - Physicochemical properties analysis and dopamine D2 receptor (D2R) docking of zotepine as an atypical antipsychotic antagonist
Mehdi Nabati Vida Bodaghi-Namileh -
Open Access Article
42 - Evaluation of [18F]FPTT Molecular structure and its binding to progesterone receptor (PR) for PET scan of breast cancer FPTT Molecular structure and its binding to progesterone receptor (PR) for PET scan of breast cancer
Mehdi Nabati Vida Bodaghi-Namileh Mohammad Mazidi -
Open Access Article
43 - The Molecular Docking and Molecular Dynamics Simulation of Some HIV-1 protease Inhibitors For the treatment of Coronavirus Disease-19
ghasem ghasemi babak motahary robabe Sayadikordabadi Asghar Alizadehdakhel -
Open Access Article
44 - Sensing of Methanol and Ethanol with Nano-Structured SnO2 (110) in Gas Phase: Monte Carlo Simulation
N. Mangkorntong L. Mahdavian F. Mollaamin M. Monajjemi -
Open Access Article
45 - Investigation of Ethanol Effect on Albumin Active Site by Simulation Methods and Calculation of its Heat Capacity
N. Dalili Mansour K. Zare G. Ghasemi -
Open Access Article
46 - Molecular dynamics simulation of interaction of Melittin and DMPC bilayer: Temperature dependence
F. Kaveh H. Pasdar -
Open Access Article
47 - Investigation of Monte Carlo, Molecular Dynamic and Langevin dynamic simulation methods for Albumin- Methanol system and Albumin-Water system
M. Monajjemi N. Dalili Mansour A. Kazemi Babaheydari M. Khaleghian -
Open Access Article
48 - Theoretical Study of Drug Delivery Ability of Carbon INanotube
N. Dalill Mansour K. Zare A Elsagh -
Open Access Article
49 - Gyration Radius and Energy Study at Different Temperatures for Acetylcholine Receptor Protein in Gas Phase by Monte Carlo, Molecular and Langevin Dynamics Simulations
M. Monajjemi A. R. Oliaey -
Open Access Article
50 - Energy study at different solvents for potassium Channel Protein by Monte Carlo, Molecular and Langevin Dynamics Simulations
F. Mollaamin T. Nejadsattari I. Layali -
Open Access Article
51 - Physical adsorption between mono and diatomic gases inside of Carbon nanotube with respect to potential energy
B. Esfandiari M. Monajjemi -
Open Access Article
52 - Characterization of Carbon Nanotube (CNT) in Adsorption Gas: Monte Carlo and Langevin Dynamic Simulation
L. Mahdavian M. Monajjemi R. Zhiani -
Open Access Article
53 - Molecular Modeling Studies on Vinblastine Binding Site of Tubulin for Antimitotic agents
Z. Varmaghani F. Mollaamin L. Pishkar B. Khalili Hadda -
Open Access Article
54 - Introducing critical residues in the human prion protein and its Asp 178 Asn mutant by molecular dynamics simulation
S. Mansouri -
Open Access Article
55 - Interaction of Pyrimidine Nucleobases with Silicon Carbide Nanotube: Effect of Functionalization on Stability and Solvation
S. Ketabi S. M. Hashemianzadeh -
Open Access Article
56 - Modifications of Internal Molecular Structures of Asphalt Components Due to Physical Aging
Iffat R. Arisa -
Open Access Article
57 - Autism and the Three Main Theories of Cognition
Azadeh Doustelahi Seyed Ali Samadi Mostafa TaqaviExtensive studies on neuropsychiatric disorders have had a significant impact on our understanding of the structure and function of the brain and nervous system; To the extent that they have had important philosophical implications in the field of philosophy of mind and MoreExtensive studies on neuropsychiatric disorders have had a significant impact on our understanding of the structure and function of the brain and nervous system; To the extent that they have had important philosophical implications in the field of philosophy of mind and cognitive sciences. Autism is a disorder that has had many changes since its inception. Research on this disorder has made it a topic in philosophical psychology. The process of this research on cognitive and behavioral deficits in people with autism has had valuable insights into the development and structure of social cognition. In this regard, the three main theories of cognition, namely the theory of mind, the theory of simulation and the theory of executive control or the theory of metacognition, each with a different approach to autism disorder, introduce different causes. In this article, we will start with the clinical definition of autism, then introduce the three main theories of cognition, and finally show the superiority of simulation theory over the other two theories Manuscript profile -
Open Access Article
58 - Folk Psychology: Theory of Mind or Mental Simulation?
نوید فرهنگ وصالیThe assumption that people understand each other by employing a‘folk’ or “commonsense” psychology is currently pervasive inphilosophy of mind, cognitive science and various other disciplines.Folk psychology is almost always taken to consist prima MoreThe assumption that people understand each other by employing a‘folk’ or “commonsense” psychology is currently pervasive inphilosophy of mind, cognitive science and various other disciplines.Folk psychology is almost always taken to consist primarily of anability to attribute internal propositional attitude states, principallybeliefs and desires, in order to predict and explain behavior in adeductive structure, so “folk psychology” also called “belief- desirepsychology”. But this is not the only theory that considers interactionbetween people, there is also a rival that called simulation theory. Thistheory is the greatest opponent of “folk psychology”. In this researchI, like Ratcliff, call all the things that people do to understand, explainand predict each other, folk psychology. And call the first view “folkpsychology as a theory of mind” and the second one “folk psychologyas a mental simulation” or “simulation” alone. In this paper I will beginby the most accepted view, folk psychology as a theory of mind, ,based on Fodor’s view, then we will come to some critics that bring upby Goldman. After these critics we will present simulation view andanswer to some of its critics to “folk psychology as a theory of mind”.Then, at the end of the essay I will conclude that we can mix this toview together and present a hybrid theory to consider what peoplereally do to explain and predict each other behavior. Manuscript profile -
Open Access Article
59 - Climate Signals applied to the prediction of evaporation in west of Iran
Enayatolah Rahmati Majid Montazeri Amir Gandomkar Mehran Lashani ZandEvaporation is one of the climatic variables that predict significant role in the planning of water. Due to the relatively high rainfall in areas of West Iran, awareness of the evaporation rate of water in these areas is essential for proper management.The factors influ MoreEvaporation is one of the climatic variables that predict significant role in the planning of water. Due to the relatively high rainfall in areas of West Iran, awareness of the evaporation rate of water in these areas is essential for proper management.The factors influencing rate of evaporation, which are climatic signals according to their role in predicting enables evaporation. Evaporation prediction was performed using artificial neural network model based on climatic signals. the data of evaporation at three synoptic stations and the most important climate signals whit at least 20 years of monthly analysis using NeuroSolution software. The results show that the most Important signals affecting the evaporation areas include; Nina3, Nina1, Sw monsoon, Mei and Nina4.Comparison of observed data with a high correlation between the ANN output data shows. So that the correlation of the Kermanshah station is 71%, Hamedan 82% and Sanandaj 80%.The output data of the neural network and climatic signals, can accurately predict the top 97% of the areas evaporation. Manuscript profile -
Open Access Article
60 - Utilizing Computer Simulation and DEAGP to Enhance Productivity in a Manufacturing System
B. Vaisi A. Ebrahimi -
Open Access Article
61 - Modeling rainfall event characteristics using D-vine copulas
مریم شفائی احمد فاخری فرد یعقوب دین پژوه رسول میرعباسیInvestigation of precipitation characteristics is necessitate in understanding and predicting phenomena of precipitation such as runoff and flood. Therefore in this study, dependence among the main characteristics of a rainfall event (i.e., rainfall depth R, maximum rai MoreInvestigation of precipitation characteristics is necessitate in understanding and predicting phenomena of precipitation such as runoff and flood. Therefore in this study, dependence among the main characteristics of a rainfall event (i.e., rainfall depth R, maximum rainfall depth M, wet period L, and dry period D) were modeled using D-vine structure. Firstly, different multivariate probability distributions were built, making all the permutations of the conditioning variables and then Archimedean and Elliptic copulas were used for fitting each pair-copula. The best copula family was selected for fitting on each pair-copula according to different criteria. In the next stage, M-R-D-L structure, i.e., with D conditioned by L, R by D and L, and M by R, D, and L, was known as the most suitable structure considering to AIC and BIC criteria. Finally, rainfall event characteristics were simulated using the selected structure. In order to evaluation of simulation accuracy of proposed model, the main statistics of simulated variables were compared with those of observed variables. The results showed that the majority of simulated statistics have good accordance with observed statistics. Manuscript profile -
Open Access Article
62 - Assessment of CERES-Wheat Model in simulation of varieties of wheat yield under different irrigation treatments
زهرا سعادتی معصومه دلبری Ebrahim Amiri مهدی پناهی محمد حسین رحیمیان مسعود قدسیThe simulation models of yield response to water are expected to play an increasingly important role in the optimization of water productivity (WP) in agriculture. In this study, the CERES-Wheat model was used to simulate of wheat yield response under different irrigati MoreThe simulation models of yield response to water are expected to play an increasingly important role in the optimization of water productivity (WP) in agriculture. In this study, the CERES-Wheat model was used to simulate of wheat yield response under different irrigation-cultivar treatments with three irrigation treatments in main plots and Five wheat cultivars in sub plots consisted of C1:C-75-5, C2: C-78-4, C3:C-78-8, C4: C-79-6 and C5: C-79-16 in Mashhad region during the years of 2002-2003 and 2003-2004. According to the results, the relative root mean square error of grain yield simulation by CERES-Wheat model was 7 and 10 % for 2002-2003 and 2003-2004 years, respectively. Because, the relative root mean square error was less than 10 percent, so done well simulation. Also, the root mean square error calculated for grain yield for both years was less than 10 percent of the observed mean. The results are indicating a good match to the simulation results of the model. The value water productivity based on crop evapotranspiration and irrigation water value in I3-C-79-6 treatment has the value highest for both years of 2002-2003 and 2003-2004. Therefore, the noted irrigation management (I3) and wheat cultivar (C-79-6) can be recommended in the study area. The overall findings of this study to confirm the optimal performance of the model CERES-Wheat in the growth process simulation and the water impact on yield in the study area. Manuscript profile -
Open Access Article
63 - Climate change impact assessment on hydrological regimes of a mountainous river basin in Iran
Mohammad Reza KhazaeiIn this paper climate change impacts on hydrological regime of a mountainous river basin is assessed. In order to do that, scenarios of global climate models are downscaled by using change factor method. The climate scenarios are used as inputs of a rainfall-runoff mode MoreIn this paper climate change impacts on hydrological regime of a mountainous river basin is assessed. In order to do that, scenarios of global climate models are downscaled by using change factor method. The climate scenarios are used as inputs of a rainfall-runoff model, which is well calibrated for the basin, and daily stream-flow series for present condition and future scenarios (2067-93) are simulated. By comparison of river-flow characteristics for present condition and future scenarios, the climate change impacts on hydrologic regime of the basin are assessed. for analysis of the emission scenarios uncertainty, scenarios of A2, A1B, and B1, which relevant to high, medium, and low emission scenarios, respectively. Based on the results, basin temperature will increase between 3 to 5 Celsius degrees and potential evapotranspiration will increase for all month of the year. Despite uncertainty of emission scenarios, under all emission scenarios, annual average of rainfall and stream flow will raise; however, seasonal cycle of rainfall and river flow will change, too. Average river flow in the autumn and winter will increase, while the average river flow in spring and summer will decrease. Decreasing of the river flow in the second half of the water year, Implies the importance of considering of the climate change impacts on the river-flow for designing of dam’s reservoir. Manuscript profile -
Open Access Article
64 - Evaluation of the sunflower yield, water productivity and soil salinity simulation under water and salinity stresses using the AquaCrop model
moazam khaleghiThe AquaCrop model is a powerful tool for the simulation of crop response to the different quantitative and qualitative management of irrigation that advanced by FAO. In this study, the latest version of this model (v. 6) was evaluated for simulating sunflower yield, wa MoreThe AquaCrop model is a powerful tool for the simulation of crop response to the different quantitative and qualitative management of irrigation that advanced by FAO. In this study, the latest version of this model (v. 6) was evaluated for simulating sunflower yield, water productivity and soil salinity under different irrigation management using saline water. Field data were collected in order to calibration and validation of model during two crop years (2014 and 2015). The experiment was conducted as a factorial design in completely randomized blocks including two factors: the quantitative irrigation management in two levels (full irrigation and partial root zone drying irrigation in 75%) and the qualitative irrigation management in three levels (non-saline water, saline water and non-saline and saline water alternation), with three replications. While a significant reduction of 3.1-32% in grain yield were observed under water-saving irrigation treatments compared to FI (4706.7 and 4367.2 kg ha-1 in 2014 and 2015, respectively), the PRD1 treatment resulted in a slight reduction of 3.1% and 5% in grain yield, in 2014 and 2015, respectively. FI had the highest WPET (0.90 and 0.89 kg m-3 in 2014 and 2015, respectively), and PRD1, PRD3, FSI, SI and PRD2 treatments ranked next. Sensitive analysis result showed that the model sensitivity to the volumetric soil water content at soil saturation and field capacity point, maximum canopy cover, HIO, time to flowering, time to CCx and CGC is more than other input parameters. Manuscript profile -
Open Access Article
65 - Operational management of agricultural bore wells in paddy fields
Hamideh noory sara Pashankpoor Abdol Majid Liaghat Arezo Nazi Ghameshloo Mohammadreza YazdaniIn this research, an operational simulation model was developed to indicate the importance of agricultural bore wells as an irrigation water resource and sustainable management of them to supply irrigation demand of paddy fields. The main approach of this research was b MoreIn this research, an operational simulation model was developed to indicate the importance of agricultural bore wells as an irrigation water resource and sustainable management of them to supply irrigation demand of paddy fields. The main approach of this research was based on maximum using of local water resources (e.g. wells, ponds). In the proposed model, crop evapotranspiration, irrigation requirement and interval and water head in soil and bore well are daily calculated based on input data and simulation equations. Then, using of obtained irrigation scheduling and considering the limitation of minimum permission level in bore well, water harvesting days from bore well, pumping discharge and time, pond water in fields and runoff are calculated. Simulation of groundwater level fluctuation in the out of paddy rice growing season in unsaturated condition of soil was computed by Hydrus-1D. The model was run for paddy fields of Rasht Rice Research Institute for normal year; The results indicated that 10 irrigation events were required that six and four of them were supplied by bore well and canal, respectively. The obtained results in the studied paddy fields showed that shallow groundwater level was discharged by precipitation in the out of paddy rice growing season and raised from depth of 4.85 m to 1.82 m. Therefore, operation of bore wells during paddy rice growing season as well as considering minimum permission water head does not cause considerable groundwater drawdown and unsustainable operation Manuscript profile -
Open Access Article
66 - Estimation of Inflow to Urmia Lake Using Time Series and Basin's Future Simulation Modeling in Two Long and Short Term Scenarios
اردلان شریف نسب Mojtaba ShourianThe Urmia Lake is the largest and the most important internal lake in Iran and is one of the most valuable international hemispherical resources in the world. But the Lake has been gradually getting dried nowadays. If the Lake gets completely dried, irreparable environm MoreThe Urmia Lake is the largest and the most important internal lake in Iran and is one of the most valuable international hemispherical resources in the world. But the Lake has been gradually getting dried nowadays. If the Lake gets completely dried, irreparable environmental, economical and social damages would be appeared in the region. So, finding a practical solution for surviving the Urmia Lake is crucial. In the present research, it has been tried to predict the inflows of the rivers leading to the Urmia Lake, once based on the long term period’s recorded data and another time based on the recent dry period’s recorded data, by using autoregressive moving average (ARMA) time series models in order to exert the effects of the recent drought in the forecasted data. The ARMA models are developed in the MATLAB soft ware. After calibration of the created models, the predicted discharges of the basin’s rivers were entered into the simulation model of MODSIM in order to estimate the water consumptions in the basin's future condition and finally the entering flows to the Urmia Lake in each of two forecasting scenarios. Results show that in each of two forecasting scenarios of long and short periods, the environmental water right of the lake wouldn’t be supplied totally. Also, if the agricultural water consumptions would get reduced about 14% and 56% in long and short periods respectively, the lake’s water right would be supplied completely. Manuscript profile -
Open Access Article
67 - Simulation of sugar beet growth under water stress using AquaCrop model
Zahra Saadati Masoomeh Delbari مهدی پناهی Ebrahim AmiriSimulation models that illustrate the effects of water on crop yield are useful tools to optimize water productivity and improve farm level water management. In this study, the performance of AquaCrop model to simulate canopy cover, biomass and yield of the sugar beet a MoreSimulation models that illustrate the effects of water on crop yield are useful tools to optimize water productivity and improve farm level water management. In this study, the performance of AquaCrop model to simulate canopy cover, biomass and yield of the sugar beet and soil water content under six irrigation treatments was evaluated. The irrigation treatments were consisted of full irrigation (T1) as control, removing last irrigation (T2), applying irrigation water at 10% greater than control (T3), applying irrigation water at 10 (T4), 20 (T5) and 30% (T6) less than control. The experiment was conducted at Aleshtar in Lorestan province during growing seasons of 2014 and 2015, using a randomized complete block design. The first and second year’s data were used for calibrating and validating of the model, respectively. Evaluation of the model was performed using the coefficient of residual mass, root mean square error, normalized root mean square error, index of agreement and coefficient of determination. According to the results, the normalized root mean square error in the canopy cover and soil water content simulations for calibration was 5.18 to 9.41 percent and 9.91 to 17.23 percent, respectively and for validation was 6.64 to 9.2 percent and 12.36 to 25.77 percent, respectively. Also, the normalized root mean square error in the yield and biomass simulations for calibration was 7.3 and 8.67 percent and for validation was 7.69 and 9.82 percent, respectively. The results indicated a good performance of the AquaCrop Model in simulating the canopy cover development, biomass and yield of sugar beet and soil water content under different irrigation managements. Therefore, the AquaCrop model can be used to explore management scenarios to improve the sugar beet water management over the study region. Manuscript profile -
Open Access Article
68 - Evaluating the potential of groundwater resources using a combination of data mining methods:(Case study: Hormozgan province, Sarkhon plain)
fateme riahi hasan vagharfard peyman daneshkar araste hamid kardan moghadamThe porpose of this study is the ground water potential mapping.using four methods, stochastic forest, GLM, Domain, and GAM. in addition, four methods for combining these methods for potential mapping were also evaluated. for this purpose, eleven criteria include the sl MoreThe porpose of this study is the ground water potential mapping.using four methods, stochastic forest, GLM, Domain, and GAM. in addition, four methods for combining these methods for potential mapping were also evaluated. for this purpose, eleven criteria include the slope , profile curvature ,(Topographic Curvature), total curvature, index (spi), index (spi), index (twi), land use, soil and demographic elevation model were used according to the experience of experts and researchers. in order to validate the 76 of wells with high discharge were, it has been used for simulation (70 %) and validation (30%) before modeling the linear test on the criteria, there is no linear relationship between variables. according to, the results of the evaluation using the ROC curve showed that all four used methods have excellent accuracy and AUC over 90%. then, the results of four methods were combined with mean averaging method. The final potential showed that 32.89% of the lands have good potential for exploiting groundwater resources.The results of the importance factors also showed that the slope, height, and power index were the most important factors. The results of this research can serve as information bases for planners and local authorities to evaluate, plan, manage, sustainably use and synthesize groundwater resources in the future. Manuscript profile -
Open Access Article
69 - Fluctuations Analysis of Rainfall and Runoff in Aras Border Basin under Climate Change Conditions
Amin Sadeqi Yagob DinpashohIn this study, rainfall and runoff data recorded of selected stations of Aras Boundary Basin were used to analyze rainfall and runoff fluctuations and they are projected for horizons, 2050. The Pettitt test was used to detect the breakpoint in rainfall and runoff time s MoreIn this study, rainfall and runoff data recorded of selected stations of Aras Boundary Basin were used to analyze rainfall and runoff fluctuations and they are projected for horizons, 2050. The Pettitt test was used to detect the breakpoint in rainfall and runoff time series. Trends in rainfall and runoff were also calculated using the original and modified Mann-Kendall test. To project the future, general circulation models (GCMs) under two greenhouse gas emission scenarios i.e. RCP4.5 (low emission) and RCP8.5 (high emissions) were used. The Eureqa Formulize tool was used to simulate the rainfall-runoff process. Results showed that most of the abrupt changes have occurred in the second half of the 1990s. 83% of seasonal time series breakpoints were related to runoff. Also, 67% of the abrupt changes have occurred in the winter and spring seasons. The highest increase in annual rainfall (according to RCP4.5 scenario) at Nir station is expected to be 9% and the highest decrease in annual rainfall (according to RCP8.5 scenario) at Khoy station is predicted at 11%. It is also worth mentioning that in the seasonal time scale will have the highest rainfall reduction in summer. The Eureqa Formulize performed very well at all stations with NRMSE of less than 0.5%. The results indicated that the lowest slope of the base period runoff trend line (in seasonal time scale) was -1.3 million m3 in summer at Badalan station. There will be no significant change in the annual flow in the future period. Manuscript profile -
Open Access Article
70 - Simulation of Long-Term Rainfall in Babolsar City by Using Optimized Wavelet-Extreme Learning Machine
hamed karimi mohammad ali izadbakhsh behrouz yaghoubi saeid shabanlouIn this study, the long-term rainfall in Babolsar city was simulated by means of an optimized AI model. To do this, the extreme learning machine (ELM) and the wavelet transform (WT) were combined. It should be stated that the monthly rainfall values from 1951 to 2019 we MoreIn this study, the long-term rainfall in Babolsar city was simulated by means of an optimized AI model. To do this, the extreme learning machine (ELM) and the wavelet transform (WT) were combined. It should be stated that the monthly rainfall values from 1951 to 2019 were applied, meaning that 70% of the observed values were employed to training the AI models and 30% of rest were utilized to testing these models. Firstly, the activation functions of the ELM models were evaluated; as a result, the sigmoid was chosen as the best activation function. Moreover, the lags of time series were introduced using the autocorrelation function (ACF) that four ELM models were defined through those identified lags. By performing a sensitivity analysis, the superior ELM model was introduced. The values of correlation coefficient (R), variance accounted for (VAF), and scatter index (SI) for the ELM model were respectively computed to be 0.524, 27.064, and 0.819. Furthermore, different mother wavelets were examined and the “dmey” was opted as the best mother wavelet. The wavelet transform enhanced the accuracy of the simulations significantly. For instance, the VAF index for the hybrid WELM model equaled to 86.461. It is noteworthy that the hybrid model was evaluated for different decomposition levels (DL) and then the best one was detected. Also, the (t-1) and (t-12) lags were identified as the most effective input lags. Manuscript profile -
Open Access Article
71 - Simulation of Stream Flow Hydrographs Using Flexible Distributed Hydrological Model (WetSpa) in Khorram Abad Basin
ehsan fatapour Ali Afrous babak aminnejad Ali Saremi amir khosrojerdiBackground and Purpose: The use of hydrological models in watersheds has always been of interest to water resources researchers. Hydrological simulation models are valuable tools for investigating challenging issues related to watershed management, such as the effect of MoreBackground and Purpose: The use of hydrological models in watersheds has always been of interest to water resources researchers. Hydrological simulation models are valuable tools for investigating challenging issues related to watershed management, such as the effect of climate change on water resources and the effect of urbanization on floods and droughts. Spatial distribution hydrological model WetSpa is used to simulate river flow at basin scale. The model uses the observed topography, land use, soil map, and daily meteorological time series (rainfall, evaporation and temperature) to predict hydrographs and distributional-spatial hydrological parameters of the basin. In this article, the object-oriented, modular and process-oriented model of WetSpa, which is prepared based on the flexible modeling approach, is applied to simulate the daily hydrograph in Khorramabad basin.Method: The inputs of the model include digital elevation maps, soil type, land use, and time series of precipitation, temperature, and potential evaporation and transpiration, which are from the statistics of 6 meteorological stations in a ten-year period (water year 84-85 until 93-94) is used. After preparing the inputs of the model, at first the maps of the distribution parameters are automatically generated in the map format by the GIS pre-processing component of the model. After that, the model is calibrated using a 5-year statistical period (water year 84-85 to 89-88) of precipitation, temperature, and potential evaporation and transpiration data. The model uses Thiessen polygons to apply precipitation, temperature, and evaporation data. For this purpose, the daily discharges of Jam Anjir hydrometric station located at the outlet of the studied watershed are used. Model calibration is done manually by determining the values of 11 global (general) parameters of the model, so that the best match between simulation and observational hydrograph is obtained. And finally, the validation of the model is carried out based on a 5-year statistical period (water year 89-88 to 94-93) and the values of the global parameters obtained in the calibration stage.Findings: The maps of distributed parameters are produced, which after preparing the inputs of Mashdand's production model showed that the average potential runoff coefficient of the area is 63% and the concentration time of the area is 17 hours. In the following, according to the 11 global parameters, which symbol and range of changes are specified in table (3), the model global (general) parameters values are obtained in the calibration stage. Comparing the simulated hydrograph by the model and the observed hydrograph in the calibration stage shows that the best match between the observed and simulated data is established with a correlation coefficient of 0.39. Validation of the model is also based on a 5-year statistical period (water year 89-88 to 94-93) and the values of global parameters. The output files of the model illustrate that 26.15% of the precipitation becomes runoff during the calibration period. During the validation period, the share of total runoff from precipitation is 26.42%. Moreover, the simulation results of the model demonstrate the ratio of evaporation to precipitation in the calibration and validation periods is 57.18 and 69.20%, respectively. Additionally, the results of the evaluation of the model based on the Kling-Gupta index (KGE) present the value of 0.68 for the calibration period and 0.74 for the validation period.Results: In this article, the effectiveness of WetSpa model is investigated in order to simulate the daily flow of Khorram Abad River at Cham Anjir hydrometric station. According to the results obtained from this research, it can be said that the Wetspa spatial distribution model has the ability to simulate the hydrological behavior of the basin with acceptable accuracy. The graphical comparison of the calculated and observed hydrographs for the calibration and evaluation period also shows a relatively good match between the two hydrographs. Examining the results of calculating of the water balance components by the model demonstrates that the outflow in the calibration and validation period accounted for 26.15 and 26.42% of the total precipitation respectively, seems logical considering the major land use of mountains and pastures in the irrigation basin. Manuscript profile -
Open Access Article
72 - Role of Biological Measures in Soil Erosion Processes using InVEST Model in the Sharghong Watershed, South Khorasan, Iran
Reza Chamani Sahar Mostafaei Younjali Seyed Hamidreza SadeghiIntroduction and Aim: Ecosystems nowadays play a unique role in meeting human demands and offering a variety of services to their stakeholders. However, occurrence of various happening, including population increase and rising demand for basic human requirements,&n MoreIntroduction and Aim: Ecosystems nowadays play a unique role in meeting human demands and offering a variety of services to their stakeholders. However, occurrence of various happening, including population increase and rising demand for basic human requirements, have created problems for Ecosystem Services (ES). As a result, land degradation is a significant environmental issue that is impacted by a variety of elements and factors. Soil conservation and erosion prevention can benefit from management and conservation measures, as well as the development of plant cover in a watershed. Therefore, an effort has been made in this study to assess how the Sharghong Watershed in Southern Khorasan, Iran, and its biological and management activities affect soil erosion at various rainfall intensities. Method: The Sharghong Watershed, with an area of 94.87 km2, is located in Birjand Township, South Khorasan Province, Iran. The mean annual precipitation in the watershed is approximately 210 mm. Due to its steep slopes in the eastern and southeastern parts, the presence of residential areas and barberry orchards in the floodplain, and intense precipitation in the spring, the Sharghong Watershed has a good potential for flooding. for evaluating. The role of biological restoration operations in soil erosion processes in study watershed InVEST Model was used. Annual precipitation data from the Qaen, Birjand, Mousavieh, and Mansourabad stations were utilized for the period between 2002 and 2020, with return periods of 2, 5, 10, and 50 years, to generate the inputs for the InVEST model. The erosivity, erodibility, crop management and land maintenance factor were then determined. Results: The maximum rainfall erosivity index (R) values for return periods of 2, 5, 10, and 50 years were 47.08, 63.68, 85.01, and 98.94 MJ mm ha-1h-1, respectively. The minimum values of R for the same return periods were 42.88, 56.68, 74.47, and 85.85 MJ mm ha-1h-1, respectively. The annual sediment yield for return periods of 2, 5, 10, and 50 years were 6699.27, 9024.56, 17452.27, and 20862.30 t, respectively. Following the implementation of the management scenario in different sub-watersheds, sediment yield reached 6439.39, 8668.37, 16892.94, and 17390.87 t, respectively. The obtained results indicated reductions of 3.9, 3.9, 3.2, and 1.7%, respectively, for return periods of 2, 5, 10, and 50 years. Conclusion: In this research, the role of biological management in controlling erosion and sedimentation in the Sharghonj Watershed during the different return periods of rainfall has been evaluated. The results of the research indicate that with the increase in the intensity of rainfall, in the current land use, the amount of erosion and sedimentation has increased, but with the application of management scenarios at the level of different sub-catchment, erosion and sedimentation has slightly decreased during the different return periods of rainfall. Due to the fact that the intensity of rainfall in the region plays an important role in creating erosion and its effect is intensified by the combination of sloping lands, the principled use of land in accordance with its potential can play an effective role in preventing land degradation. Therefore, the approaches of this research can be beneficial for providing a suitable management model for managers, operators and beneficiaries of watersheds. Manuscript profile -
Open Access Article
73 - Simulation of furrow irrigation performance using seasonal modeling under various on-farm water managements
Mahboobeh Ghobadi Hamed Ebrahimian Fariborz AbbasiIncreasing irrigation efficiency has been become one of the main solutions to be considered on-farm increasing water productivity due to limited water resources. The objective of this study was to apply a seasonal simulation model to determine irrigation performance ind MoreIncreasing irrigation efficiency has been become one of the main solutions to be considered on-farm increasing water productivity due to limited water resources. The objective of this study was to apply a seasonal simulation model to determine irrigation performance indicators for different scenarios such as deficit irrigation, inflow rate and frequency of irrigation, under two different fields in Karaj (College of Agriculture and Natural Resources and Seed and Plant Improvement Institute farms) in order to decrease irrigation losses and improve irrigation water uniformity. The results showed that the College farm had more runoff losses due to heavier soil texture and shorter furrows compared with to the Institute farm. Irrigation efficiency increased when reducing inflow rate and frequency of irrigation, irrigation efficiency increased about 40% in the higher irrigation frequency by reducing inflow rate from 0.64 to 0.22 L/s. In addition, the highest efficiency happened in three-day irrigation frequency with 0.22 L/s inflow rate. However, the Institute farm had larger deep percolation losses than the college farm. Moreover, the results of simulated soil moisture during the growing season showed that the difference between the minimum and maximum soil moisture was less under lower values of inflow rate and irrigation frequency (such as three-day irrigation frequency and 0.3 L/s inflow rate in the Institute farm and three-day irrigation frequency and 0.22 L/s in the College farm). The seasonal simulation model had good capability to evaluate furrow irrigation performance under different on-farm water managements. Manuscript profile -
Open Access Article
74 - Evaluating some pedotransfer functions for simulation of transient water flow in soil
Sanam Jafari Gilandeh Ali Rasoulzadeh Habib KhodaverdilooQuantitative description of soil hydraulic properties is necessary for any scheduling related to soil and water resources conservation. Soil hydraulic properties are important inputs for simulation of water flow and solute transport in soil. Since direct measurement of MoreQuantitative description of soil hydraulic properties is necessary for any scheduling related to soil and water resources conservation. Soil hydraulic properties are important inputs for simulation of water flow and solute transport in soil. Since direct measurement of these properties is time consuming and costly, pedotransfer functions (PTFs) have been widely and successfully used for their prediction. Yet, little efforts have been made for functional evaluation of PTFs predictions for application in simulating transient soil water flow. In this study, soil water retention curve (SWRC) of a clay soil was predicted, using some selected local and global PTFs. SWRC was also measured in the laboratory by direct method. Validity of studied PTFs in terms of prediction of SWRC was examined. By applying both predicted and measured hydraulic parameters to HYDRUS-1D program for simulation of soil water flow, functional behavior of PTFs was quantitatively compared in terms of simulation of water flow in soil. The obtained results indicated that both the selected global PTFs (Rosetta) with root mean square error (RMSE) < 0.025 cm3cm-3 and some regional PTFs (Ghorbani-1) with RMSE < 0.014 cm3cm-3 can reasonably well predict SWRC of soil surface. For prediction of SWRC of subsurface soil, the RMSE value of global PTFs was larger than 0.107 cm3cm-3 and was ranged from 0.036 to 0.356 cm3cm-3 for the local PTFs. However, for simulation of soil water flow a different set of PTFs was most efficient. RMSE values of adjusted Ghorbani PTF (S-Gh&H (Adj.)) for simulation of water content of surface and subsurface soils were 0.025 and 0.055 cm3cm-3, respectively. RMSE value of Wosten (1997, 1999) PTFs for surface soil was larger than 0.149 cm3cm-3 and for subsurface soil was less than 0.058 cm3cm-3. Simulation with the measured SWRC had RMSE values of 0.013-0.040 cm3cm-3 for surface and subsurface soils, respectively. It can be concluded that when validating PTFs, one should consider the objective for which the PTFs are assessed. A PTF might be accurate enough for predicting SWRC, but not for particular q(h) range governing the soil water redistribution process. Using such PTFs might lead to large errors in simulating soil water content. Manuscript profile -
Open Access Article
75 - Evaluation of temporal variation of splash erosion in different slopes and agricultural and forest land uses
Ashkan Yusefi Ahmad Farrokhian Firouzi Bijan Khalili MoghaddamSoil erosion is one of the major worldwide environmental challenges and its related destructive effects cannot be ignored at both inside and outside of a region. Splash and transport of soil particles by raindrops are the initiating mechanisms of water erosion. The obje MoreSoil erosion is one of the major worldwide environmental challenges and its related destructive effects cannot be ignored at both inside and outside of a region. Splash and transport of soil particles by raindrops are the initiating mechanisms of water erosion. The objective of this research was to investigate temporal variations of splash erosion in different slopes and land uses using a rainfall simulator. The experiment was conducted as factorial based on completely randomized design with three replicates. The experimental treatments were consist of slope at two levels (5 and 15%), duration of rainfall at four levels (5, 10, 15 and 20 minute) and different land uses (forest and agriculture).The results indicated that amount of splash increased with increasing rainfall duration. The amount of splash erosion of the 20-min rainfall duration was 2.08, 1.76 and 1.08 times more than of 5, 10 and 15-min, respectively. The average soil loss by splash erosion in agricultual and forest land uses was 29.37 and 25.56g.m-2, respectively. Furthermore, the results showed that as slope increased from 5 to 15% the amount of splash erosion increased 11%. In general, at all rainfall durations, splash erosion increased significantly with changes in slope steepness (from 5 to 15%) and land use from forest to agriculture, but there was no significant difference between the15 and 20-min rainfall durations. Manuscript profile -
Open Access Article
76 - Development of multi-purpose reservoir operation hedging rule in water resources shortage conditions using MODSIM8.1
Parinaz Razaghi Hossein Babazadeh Mojtaba ShourianUneven distribution of precipitation in many arid and semi- arid regions like Iran, has led to water reserved for a reliable supply. Recently, large dam construction is more extended for water storage. Construction of the reservoir, while the high costs, it also has man MoreUneven distribution of precipitation in many arid and semi- arid regions like Iran, has led to water reserved for a reliable supply. Recently, large dam construction is more extended for water storage. Construction of the reservoir, while the high costs, it also has many environmental problems. Consecutive drought events have led to hedging rules is more considered by reservoirs operators. This study aimed to develop hedging policies for reducing stress during drought years through the water store before stress period. Therefore, Namroud storage dam river system was simulated using the MODSIM8.1. After the calibration, hedging rule algorithm was coded in the model and it was run with and without hedging implementation. The system operation indices such as satisfaction, reliability, vulnerability, resiliency and sustainability of the system were calculated for two states. The results were shown that the developed hedging rule algorithm cause adjustment the big stress and uniformity distributed in operation period. With hedging rule implementation, reliability and system sustainability indices were increased 10 and 7 percent, respectively, and vulnerability and resiliency indices were decreased 18 and 9 percent respectively. These results were shown the indices were improved under hedging rule. Manuscript profile -
Open Access Article
77 - Effect of type and application level of polyacrylamide on soil loss
Seyed Hamidreza Sadeghi Zeinab Karimi Hossein Ali BahramiSoil erosion is one of the basic issues at global, regional and local scales. Considering management plans in hindering its effects has therefore significant importance. Additionally, application of additive materials including polyacrylamide is one of new techniques in MoreSoil erosion is one of the basic issues at global, regional and local scales. Considering management plans in hindering its effects has therefore significant importance. Additionally, application of additive materials including polyacrylamide is one of new techniques in the field of soil erosion control. Despite of application of Polyacrylamide in runoff and soil erosion management, its contemporary effect in type and the amount of usage has been less considered. The present study was therefore carried out in order to determine the impressibility of soil loss in small plots from application of flour and soluble polyacrylamide in different levels of 0.4, 2, and 6 g m-2 under the laboratory conditions. To this end, three plots with dimensions of 0.5*0.5m and 30% slope were used. In order to apply the current study, rainfall was simulated on study plots with intensity of 50 and 80 mm h-1 and respective duration of 17 and 8 min after 48 h from using polyacrylamide in flour and soluble types. The results obtained from statistical tests verified significant (P=0.00) effect of polyacrylamide type and different rainfall intensities on the amount of soil loss in different levels of the polyacrylamide usage. In addition, the performance of powder application of polyacrylamide under study conditions was found better than that recorded for the solute application and therefore is recommended for the purpose of soil loss control. Manuscript profile -
Open Access Article
78 - Gilan; optimized allocation; rain harvest; simulation-optimization model
Mona Deyhool Hamideh Noory Farhad Mirzaei Mohammad Reza YazdaniOptimal operation of local resources can be effected in conservation water resources of paddy fields and corrected water distribution. Therefore, in this study, a simulation-optimization model of exploit ponds has been developed for investigate the role of ponds to stor MoreOptimal operation of local resources can be effected in conservation water resources of paddy fields and corrected water distribution. Therefore, in this study, a simulation-optimization model of exploit ponds has been developed for investigate the role of ponds to store local water and use it to supply irrigation water requirement of paddy fields. Evapotranspiration, irrigation water requirement, irrigation interval and pond balance were simulated and then number of canal intake, storage volume and released volume of pond were optimized by binary genetic algorithm. The developed model was applied for Fashtam pond in Sangar, Gilan province. The result showed that in normal year 54% of irrigation requirement of paddy fields were supplied by rainfall and runoff water saved in Fashtam pond and the rate of over flow water of pond to maximum volume of that were74%. The model result for scenario of increasing pond storage two times showed the rate of pond in supplying irrigation requirement of paddy fields is increased to 91% Manuscript profile -
Open Access Article
79 - Trend of soil loss and sediment concentration changeability due to application of polyacrylamide
Seyed Hamid Reza Sadeghi Zeinab Hazbavi Habibollah Younesi Morteza BehzadfarSoil erosion control is very important to natural resources conservationists and managers. For this reason, different methods and practices have been developed and used to control soil erosion. Application of soil amendments is one of the most recent technologies in soi MoreSoil erosion control is very important to natural resources conservationists and managers. For this reason, different methods and practices have been developed and used to control soil erosion. Application of soil amendments is one of the most recent technologies in soil and water conservation. However, different aspects of its application have not comprehensively been considered. Hence, the present research intended to assess the application of polyacrylamide (PAM) as an important soil amendment on soil loss and sediment concentration. The research was conducted under simulated rainfall condition in small plots on the loess soils of Bojnourd City located in Northern Khorasan Province, Iran. Accordingly, the laboratory experiments were conducted in treatments of 0 (control), 0.4, 0.6, 1, 2, 3, 4 and 6 g m-2 of polyacrylamide with simulated rainfall intensity of 72 mm h−1 with 30 minutes duration in three replicates. The collected data on soil loss and sediment concentrations showed that polyacrylamide significantly reduced both soil loss (P=0.04) and sediment concentration (P= 0.004). The maximum sum amount of soil loss and sediment concentration were 49.32 g and 10.79 g/l, respectively, at control treatment and their minimum were 18.03 g and 6.93 g/l respectively, at 6 g/m2 level of PAM application.Also, the results showed that the polyacrylamide had no significant effect on temporal changes of soil loss and sediment concentration during event duration (P>0.3). The results suggest that PAM, as an available amendment, can be recommended for water and soil conservation purposes. Manuscript profile -
Open Access Article
80 - Effect of wheat straw on changing time to runoff and runoff coefficient in laboratory plots under rainfall simulation
Ataollah Kavian Maziar Mohammadi Moghadaseh Fallah Leila GholamiThe runoff and soil erosion is most basic of environmental, agricultural and food production problems in the world, that these had adverse effects on the natural ecosystems and man-managed. One of the most important factors of runoff and soil erosion control is using or MoreThe runoff and soil erosion is most basic of environmental, agricultural and food production problems in the world, that these had adverse effects on the natural ecosystems and man-managed. One of the most important factors of runoff and soil erosion control is using organic and inorganic mulches, that they have most role in runoff and soil erosion control. Therefore in this study, for studying time to runoff and runoff coefficient changes used from an organic mulch (wheat straw mulch) in laboratory conditions. The experiments was done using rainfall simulation, in slope of 30% and plot scale of 0.5 m2 with 3 replications, with two cover percent of 50 and 90% and rainfall intensities of 50 and 100 mm h-1 for 10 min and then the time to runoff and runoff coefficient rates measured. The results showed that in rainfall intensities of 50 and 90 mm h-1, the conservation treatment could increase and decrease time to runoff and runoff coefficient, respectively and the cover of 90% had more effect in increasing time to runoff and decreasing runoff coefficient. The enhancement percent of time to runoff in rainfall intensities of 50 and 100 mm h-1 (cover of 90%) was 102.37 and 70.80%, respectively. The reduction percent of runoff coefficient in rainfall intensities of 50 and 100 mm h-1 (cover of 90%) also was 36.58 and 27.31%, respectively. The effect of conservation treatment and rainfall intensity variables evaluated significant expect in the effect of rainfall intensity × conservation treatment. Manuscript profile -
Open Access Article
81 - Quantitative Investigation and Simulation of CO2 Sequestration in Petroleum Reservoirs Aquifer
iman darvishi Mohamad Hossein Ghazanfarri Riyaz KharratBackground and Objective: Generation and emission of greenhouse gases in air has caused climate changes and global heating. So, it is really important to reduce greenhouse gases generation or to dispose them. Injection of CO2 in hydrocarbon formations in order to EOR in MoreBackground and Objective: Generation and emission of greenhouse gases in air has caused climate changes and global heating. So, it is really important to reduce greenhouse gases generation or to dispose them. Injection of CO2 in hydrocarbon formations in order to EOR in depleted oil and gas reservoirs and in aquifers is one of the disposal ways. Method: In this project using commercial simulator CO2 Sequestration in an oil reservoir aquifer has been simulated in compositional way. Reservoir connected aquifer has been simulated using Fetkovich model and injection wells are completed in aquifer section. Simulation has been performed under four different scenarios in vertical and horizontal wells. Findings: CO2 injection and storage in aquifer are possible in different cases like free gas, sequestrated (entrapped) gas, gas solved in water and storage as solid minerals that with regards the conditions in this study, entrapped gas and free gas were resultful. Discussion and Conclusion: Results show better potential for this end for horizontal wells than vertical wells, which two horizontal (3.3e+11 sm3) wells or six vertical wells (6.9e+11) are required to inject and store specified volume of CO2 and due to the importance of well completion and durability of gas in reservoir, down completion is suggested. Manuscript profile -
Open Access Article
82 - Investigating the Role of Global Warming on Wind Speed and Sea Level Pressure Fluctuations in Sistan Region
Esmaeil Poudineh Broumand Salahi Mahmoud Khosravi Mohsen HamidianpourBackground and Objective: The temporal variability of local winds of Sistan during the period of global warming is the subject of this research. In recent decades, global warming has brought about tangible changes in the temperature of the planet and has influenced othe MoreBackground and Objective: The temporal variability of local winds of Sistan during the period of global warming is the subject of this research. In recent decades, global warming has brought about tangible changes in the temperature of the planet and has influenced other atmospheric parameters such as wind speed. Method: In the study of atmospheric parameters, estimating the effect of global warming on these parameters is important. For this purpose, variations in the Sistan wind speeds and sea level pressure in the study area under the conditions of the two scenarios A2 and B2 from the output of the global Hadcm3 model were downscaled and for three periods of 30 years up to 2099, the changes in these two parameters were generated and examined. Findings: The results showed that the average wind speed calculated by scenario B2 for the period 2010-2039, 2040-2069 and 2070-2070 respectively 0.67, 0.88 and 1.15 m / s Relative to the Basic course will increase. Also, the average wind speed variation under A2 scenario Conditions, which is a pessimistic scenario, is 1.36 and 1. 57 and 1.79 m / s for the periods 2039-2039 and 2069-2070 and 2070-2070 Also, the pressure calculated by scenario B2 for the period 2010-2039, 2040-2069, and 2070-2070 will be reduced to 0.04, 0.10, and 0.16, respectively, compared to the base period. Discussion and Conclusions: The results showed that the decline in pressure and increase in wind speed has not been uniformly distributed throughout the year. However, during the winter and spring and summer, pressure drop is more regular than the autumn season. Manuscript profile -
Open Access Article
83 - Feasibility of using geothermal energy in building in order to reduce carbon dioxide pollutant emissions in environment (Case Study: Hamedan)
mahdi shaabanian mohammadhadi kaboli ali dehghanbanadaki leila zareBackground and Objective: The thermal behavior of underground buildings is different from that of above ground buildings. The approaching temperature of the inner layers of the earth to the average annual outdoor temperature reduces the heat exchange of these buildings MoreBackground and Objective: The thermal behavior of underground buildings is different from that of above ground buildings. The approaching temperature of the inner layers of the earth to the average annual outdoor temperature reduces the heat exchange of these buildings compared to buildings on the ground. Reducing energy consumption reduces greenhouse gas emissions. The purpose of this study is to evaluate the feasibility of using geothermal energy in buildings to reduce carbon dioxide emissions in the city of Hamedan with cold climatic conditions in 2019. Method: The simulation was performed by using version 8-1-0 of Energy Plus software. In the model, a standard 900 Ashrae sample space with residential usage was considered. At first the building was located on the ground as default and its energy consumption was set to 0/424 MWh /m2. In later stages, the sample is gradually placed in depth in successive steps equal to 0.5, 1, 1.5, 2, 2.5 and 3 meters. Findings: findings showed that in each depth, 14.51%, 28.38%, 44.56%, 57.25%, 74.70% and 79.07% of the annual energy requirements of the sample space has been reduced. On the other hand, in each scenario, the carbon dioxide pollutant emissions as the main greenhouse gas, has been declined to 0.65, 1.27, 1.99, 2.57, 3.35 and 3.55 percent, respectively. Discussion and Conclusion: Therefore, It was concluded that Placement of buildings under the ground reduces carbon dioxide pollutant emissions in environment. Manuscript profile -
Open Access Article
84 - An Investigation into Self-Purification and Modeling of Changes in Nitrogen and Phosphor along Dez River (The Distance between Dez Dam and Band Ghir Bridge)
Omid Babamiri Safar Marofi Arash AzariBackground and Objective: It is necessary to use mathematical models to determine the expected reaction of a river to the effects of entrance of pollutants. Such models can simulated the effects of current and future loadings and help managers and authorities make their MoreBackground and Objective: It is necessary to use mathematical models to determine the expected reaction of a river to the effects of entrance of pollutants. Such models can simulated the effects of current and future loadings and help managers and authorities make their final decisions. The purpose of this study is to simulate and be aware of the trend of nitrogen and phosphorus changes along the Dez River (Dez Dam to Ghir Dam Bridge) using the Qual2kw model and also to calculate the percentage of river self-purification. Method: The present study was aimed at measuring and comparing the data of the quality of Dez River water collected from three stations. Self-purification model of the river was determined by inserting qualitative and quantitative data retrieved from the stations, and the entering wastewaters in the dry season were created and calibrated. Findings: The results of the present study showed that the river has poor self-purification power. The highest self-purification power was related to N-NH4 parameter in 2014 (45%). The level of non-organic phosphor along the river had an increasing trend. Discussion and Conclusion: The level of nitrate nitrogen and ammonia nitrogen within the distance of 173 to 90 km of the river had an increasing trend due to influx of sewage. The best modelling for N-NH­4 parameter was related to 2016 with a standard error of 0.02. Manuscript profile -
Open Access Article
85 - Hydrogeological Assessment of the Groundwater Heat Pump (GWHP) System
Hajar Barzegar Hadi Jafari Seyed Majid HashemianBackground and objective: Groundwater heat pump (GWHP) system that uses the constant temperature of the groundwater as the source of the clean and renewable energy for heating and cooling, is applied as a strategy for energy saving and the CO2 reduction. In this techniq MoreBackground and objective: Groundwater heat pump (GWHP) system that uses the constant temperature of the groundwater as the source of the clean and renewable energy for heating and cooling, is applied as a strategy for energy saving and the CO2 reduction. In this technique, groundwater is extracted by pumping wells, passed through the heat exchanger and then returned to aquifer through the injection shafts. This research is aimed to assess the Groundwater Heat Pump (GWHP) System from hydrogeological point of view. Method: Regarding the mathematical similarities between transport of the heat and mass in porous media, the applied computer code of MT3DMS in mass transport modelling, was used in this study for simulation of the heat transfer in the groundwater system to assess the GWHP from hydrogeological viewpoint. Finding: The results show that a thermal plume is developed around the injection well due to the energy exchanges in GWHP system. This plume is regarded as an indicator of the impact of the injected water temperature on the underground source. Its extent and direction which are directly affected by the hydrogeological parameters is not fair from the heat transport aspect and finally the performance of the GWHP system. Discussion and Conclusion: Modelling results clearly show that with the change in hydraulic conductivity in relation to the type of the sediments in porous media, hydraulic gradient and porosity of aquifer, the extent of the thermal plume is changed, expecting impacts on functionality of the GWHP system. The results of the study can be used in utilization of the GWHP system in the country, of course after the technical-and-economic justifications. Manuscript profile -
Open Access Article
86 - Simultaneous Simulation of Gasification Reactor and Steam Cycle of Tehran's Waste Incineration Power Plant
Milad Banaei gholamreza SalehiBackground and Objective: The purpose of this paper is simulationg of gasification and steam cycle of Tehran waste power plant in order to achieve and identify the parameters affecting the efficiency and output of power plant. The information obtained through this simul MoreBackground and Objective: The purpose of this paper is simulationg of gasification and steam cycle of Tehran waste power plant in order to achieve and identify the parameters affecting the efficiency and output of power plant. The information obtained through this simulation, in addition to being used to increase the productivity and efficiency of Tehran power plant, can be used as valuable information in other waste power plants of the country should also be employed. Method: By considering the obtained data from Process Flow Diagram, actual operation condition of this plant, the analyses of Tehran’s urban waste and using Aspen plus software as the simulating and modeling tool. The developed simulation model has been validated by using actual operating condition of the plant and also the experimental results of the verified papers. Findings: The result shows that the moisture content and the composition of the inlet MSW have significant impact on the output power of this plant. The findings indicate that a 10% reduction in the moisture content of inlet MSW cause an increase of 30% in output power. Also, by increasing the wood and the green waste in the combination of inlet MSW, the output power will be reduced. Discussion and Conclusion: Generally, MSW has low thermal value due to its high percentage of biological ingredients. Therefore, identifying the factors which are affecting the efficiency and power output of the power plant is essential and important. In this regard, the simulation shows that the high percentage of wood-containing compounds and green waste in the input waste will reduce the output power of this plant. As a result, implementing necessary measures to reduce the amount of moisture content of incoming waste as well as achieving the combination with the least amount of wood and green waste will increase the efficiency and the output power of this plant. Manuscript profile -
Open Access Article
87 - Investigating the Effect of Different Energy Saving Strategies on Energy Rating of Building by Design Builder Software (Case Study: Office Building)
Afshin Fathalian Hadi KargarsharifBackground and Objective: Reducing fossil energy resources, the environmental impact of high energy consumption and increasing the energy consumption in the building section, has increased the importance of attention to building energy consumption in the country. Provid MoreBackground and Objective: Reducing fossil energy resources, the environmental impact of high energy consumption and increasing the energy consumption in the building section, has increased the importance of attention to building energy consumption in the country. Providing the standard of building energy consumption in our country is one of the important activities in this regard. This study aimed to determine the effect of different strategies to reduce energy consumption in the energy classification of office buildings as a case study by Design Builder software. Method: In this study, the total energy consumption of of an office building in Semnan climate was simulated by Design Builder software and the results obtained by the software, with the actual energy consumption of the building in 2016, which was obtained from the energy bills (electricity and gas) of the building, were validated. Then, using the energy rating of building, different strategies for reducing energy consumption were simulated and compared with the existing situation. Findings: Using energy simulation software, various energy efficiency strategies such as using external horizontal shading and removing internal shading, replacing windows with low-emitting double-glazed windows instead of single-glass windows and installing a thermal insulation in the external wall of the building were investigated that 15.2, 18.4 and 8.2% reduction in energy consumption achived compared to normal case, respectively. Then, the intensity of building energy consumption for each of the proposed strategies were calculated and the energy rating was determined for each. Discussion and Conclusion: The results showed that the replacement of external shading instead of internal shading had the least amount of savings and had no effect on the change in energy rating and the use of a combination of double glazing instead of single-walled and thermal insulation in the outer wall of the building while upgrading to the classification, the optimal suggested mode. Finally, the results of this study showed that in the case of accurate simulation of existing buildings and then validation the effects of different strategies on energy rating and consumption can be predicted accurately. Manuscript profile -
Open Access Article
88 - Optimization of future land use changes using CLUE-s model in the Ramian Township
Majid Mohammady Jafar DastoraniBackground and Objective: land use changes and conversion of natural resources to agricultural and residential area is an important problem in many countries. Land use change is an essential determinant factor in hydrological processes and is known as an affecting facto MoreBackground and Objective: land use changes and conversion of natural resources to agricultural and residential area is an important problem in many countries. Land use change is an essential determinant factor in hydrological processes and is known as an affecting factor on hydrological parameters such as runoff volume, flood frequency, base flow, subsurface and surface flow. Regard to importance of land use many models was presented to simulate land use changes. The main objective of this research was to simulate the land use changes of Ramian Township for future as a case study site. Material and Methodology: The main objective of this research was to simulate the land use changes of Ramian Township as a case study site. At first, land use maps related to years of 2000 and 2012 were prepared using remote sensing techniques and Landsat images, and then CLUE-s model was applied to simulate land use map of 2030 and create scenarios. Four scenarios were designed using CLUE-s model and define some limitation of land use change. Discussion & Conclusion: the results showed that the main land use change in Ramian Township was the conversion of forest and rangeland areas to agriculture and residential land. 18.07 km2 of forest and range were converted to agriculture and residential area. Of course in the designed scenarios conversion of this land use types were limited at the specific locations. Land use simulation and scenario design can be very useful for programmers and natural resources managers. Manuscript profile -
Open Access Article
89 - Hazard Identification and Consequences Analysis of Possible Accidents in the Tank Farm & Flare of the ILAM Gas Refinery by ETBA and PHAST Soft wear
seyed Rohollah sharifi fatemeh RazavianBackground and Objective: The ILAM Gas Refinery, which produces natural gas, ethane, C3+, C5+, and Sulphur, is situated in the west of Iran and in the Central Zagros Range, and thus, examining the consequences of possible industrial accidents considering the probable ef MoreBackground and Objective: The ILAM Gas Refinery, which produces natural gas, ethane, C3+, C5+, and Sulphur, is situated in the west of Iran and in the Central Zagros Range, and thus, examining the consequences of possible industrial accidents considering the probable effects on personnel, equipment, installations, and the environment is of great importance. Method: In this study, the risks related to the storage tanks and flare were identified and prioritized. Then, the consequences of the identified risks for the selected scenarios comprising radiation due to fire, the pressure due to an explosion, and leakage of toxic material were modeled using the Process Hazard Analysis Software Tool (PHAST) for possible accidents. In this study, the ETBA method identified 70 risks, among which seven of them were in the unacceptable range, in which four risks were associated to the spherical storage tanks, loading (two risks), and the cylindrical storage tank and the flare were each assigned one risk. The risk associated with the heat energy of the spherical and cylindrical storage tanks and the flare were significant. Subsequently, the consequences of four scenarios including the sudden release of gas from the spherical storage tank, leakage of gas condensate from the cylindrical tanks, leakage of Liquid Petroleum Gas (LPG) from the loading arm, and flare-off were selected for simulation. Discussion and Conclusion: In the first scenario, the radiation resulting from fire and the shockwave of the spherical storage tank explosions affected a wide area of the refinery. In the second scenario, leakage of condensate gas from the adjacent wall to the cylindrical storage tanks is of certain significance. In the third scenario, the location of the loading platform is unsuitable. In the fourth scenario, the height of the flares is suitable and the release of toxic and flammable gases does not pose a significant consequence for the installations and people in connection. Reviewing the fire extinguisher systems, constant assessment of the lightning arrestors, and conducting firefighting drills are among the recommendations of this study. Manuscript profile -
Open Access Article
90 - Thermodynamic and Environmental Simulation and Analysis of Tehran Petroleum Refinery Power and Steam Plant
Mohammad Hasan Khoshgoftar Manesh Mohammad TolamiBackground and Objectives: Oil refineries are the most energy-intensive industries and produce a lot of pollutions. So, thermodynamic simulation is important for performance analysis of equipment, estimation of emissions and environmental impacts. In this paper, simulat MoreBackground and Objectives: Oil refineries are the most energy-intensive industries and produce a lot of pollutions. So, thermodynamic simulation is important for performance analysis of equipment, estimation of emissions and environmental impacts. In this paper, simulation and thermodynamic and environmental analysis of Tehran refinery power and steam plant have been studied. Method: In this regards, two scenarios for performance improvement of steam and power system have been proposed for Tehran refinery. Thermodynamic simulation of each main component has been performed in Matlab Environment. To verification of simulation results, Thermoflex and Star software have been employed. Also, Sima Pro software has been used for estimation of environmental impacts based on Life Cycle Assessment (LCA). Findings: Results show the accuracy of the thermodynamic simulation is very high. The power of steam turbines has been increased by 8.87 % in the second and third scenarios. Also, the environmental impacts have been reduced 16 % in second and 60% in third scenarios. Discussion and Conclusion: According to the proposed scenarios and optimization of Tehran Refinery steam network, the efficiency of the network increases energy consumption and production of pollutants is significantly reduced. Manuscript profile -
Open Access Article
91 - Design, simulation and comparison of two novel renewable energy systems consisting of solar, biofuel and incineration plant to generate power and freshwater in Abu Musa Island
mohsen rostami Masoud Behzadinia Amirhamzeh FarajollahiBackground and Objective: With population growth and the pattern changes of the societies towards consuming more energy and resources, the reduction of fossil fuel reserves, lack of access to freshwater resources, and increasing environmental pollutants caused people to MoreBackground and Objective: With population growth and the pattern changes of the societies towards consuming more energy and resources, the reduction of fossil fuel reserves, lack of access to freshwater resources, and increasing environmental pollutants caused people to feel the need of using new and cleaner methods of energy production. Therefore, the use of renewable energy systems is one way to solve some of these problems. Material and Methodology: The present research is descriptive-analytical with an applied approach that its purpose is to use renewable energy in two design scenarios including solar collector, biofuels, and incineration plant in order to meet the partial need for the power and freshwater of the island. The simulation of the two proposed scenarios was performed by MATLAB, TRNSYS, and AspenTech engineering software. Techno-economical evaluations of the power and freshwater produced along with environmental impacts were also analyzed and reported. Findings: According to the results, it was found that the second scenario consisting of incineration plant - biofuel produced more power and freshwater than the first scenario and can also facilitate the management of waste in the region, while the first design including a solar collector - biofuel despite its lower power production, supplied cleaner energy with much better financial results. Discussion and Conclusion: To summarize, both proposed scenarios have high potential to meet a major portion of the region's needs, and, based on strategic policies and sustainable development, each design can be selected according to the current priorities of the region. Manuscript profile -
Open Access Article
92 - Land use changes predicition in Zagros forest areas based on Markov Chain Model
Ali Qaderian Naser Ahmadi SaniBackground and Objective: Today, due to increasing population growth and land use changes and its impact on the environment, monitoring and modeling land use changes is one of the main prerequisites for optimum use of land and achieving sustainable development. The purp MoreBackground and Objective: Today, due to increasing population growth and land use changes and its impact on the environment, monitoring and modeling land use changes is one of the main prerequisites for optimum use of land and achieving sustainable development. The purpose of this study was to evaluate and predict the spatial and temporal dynamics of land use in the county of Sardasht, in order to obtain basic information for planning in line with sustainable forest management.Material and Methodology: Data from the Landsat 7 images (+ETM) 2003, and Landsat 8 (OLI) 2015 were analyzed. The Maximum Likelihood algorithm has been used to mapping the land use for the years. The analysis of the change dynamics using traditional Markov Chain and Cellular Automata was predicted for the next 25 years.Findings: The overall accuracy of classified images in 2003 and 2015 was 89% and 94%, respectively, and the Kappa coefficient was 0.87 and 0.92. The results showed that during the period, bout 7% of the forest area has decreased and the agricultural lands has increased by 72%. According to the Markov transmission probability matrix the classes most affected by these changes is the forests and rangelands that changed to agricultural and residential.Discussion and Conclusion: Changes in the extent of forests until 2040 show that the area of forests will decrease continuously. The results of current study could provide quantitative information, which represents a base for assessing the sustainability in the management of Zagros forest ecosystems and for taking actions to mitigate degradation. Manuscript profile -
Open Access Article
93 - Comparison of the Fixed External Sun Shading Devices Performance in order to Daylight Control (Case Study: Southern Facade in Yazd Climate)
Tahereh Nasr Zahra YarmahmoodiBackground and Objective: With the advancement of technology, there has been an increase in energy consumption. For example, in hot and dry climates, where the amount of heat and sunlight is high during the day, it causes too much sunlight to enter the interior and incr MoreBackground and Objective: With the advancement of technology, there has been an increase in energy consumption. For example, in hot and dry climates, where the amount of heat and sunlight is high during the day, it causes too much sunlight to enter the interior and increases the temperature, which increases the consumption of cooling energy. Fixed sun shading in this climate can greatly reduce cooling energy consumption. Therefore, the purpose of this study is to identify different types of fixed external sun shading devices and finally select the best of them in terms of performance to optimize energy consumption in hot and dry climates.Material and Methodology: The research method is quantitative and simulation-modeling. The data collection tool for the theoretical foundations section is library and documentary. In this way, the fixed sun shading devices are modeled in Rhino 6 software and Grasshopper plugin. After that, the climate of Yazd, which is hot and dry, has been selected for energy analysis by the Ladybug Tools 1.1.0 in a Grasshopper environment in order to achieve a suitable type of fixed external sun shading devices in hot and dry climates. Thermal analyzes have been performed in Ecotect software. Findings: The results of the present research show that the geometric, eggcrate and horizontal shading devices have the best performance in terms of optimizing energy consumption. Discussion and Conclusion: Therefore, considering that geometric shading devices are very similar to the shading devices in traditional Iranian architecture, it can be concluded that proper innovation by preserving the principles and avoiding blind imitation of the past can be desirable and economical solutions to the problems of the present age. Manuscript profile -
Open Access Article
94 - Assessment of the Impacts of Increasing Cavity Depth and Floor Numbers on Energy Performance of Different Types of Double Skin Facade in Office Buildings of Cold Climate in 36 Different Scenarios (Case Study: An Office Building in Tabriz)
Shirin Nourivand Lida Balilan Lida Balilan Maziar AsefiBackground and Objective: As a result of the rising awareness of environmental issues and the increase in the cost of energy, building professionals increasingly have to consider the sustainability and energy performance of their designs by using building energy perform MoreBackground and Objective: As a result of the rising awareness of environmental issues and the increase in the cost of energy, building professionals increasingly have to consider the sustainability and energy performance of their designs by using building energy performance simulation tools. The aim of the current study is to optimize energy consumption of office buildings in cold climate of Tabriz and providing optimal model of double skin façade (DSF) in this climate.Material and Methodology: The research method in this paper is based on causal research and simulation. The research tool in this paper is Design Builder software. The energy performance of DSF is studied in 36 scenarios under 4 types of DSFs in an office building in cold climate of Tabriz in three cavity depths of 0/7, 1 and 1/3m in three modes: 5,10 and 15-story to achieve minimum energy consumption.Findings: The results indicate that, the 5-story box window type with a depth of 1/3m has a minimum electricity consumption and the 15-story multi-story type with a depth of 0/7m has a minimum gas consumption. In a fixed cavity depth, electricity consumption will increase and gas consumption will decrease by increasing the numbers of floors. Electricity consumption also increases with the increase of cavity depth. The 15-story multi-story DSF with a cavity depth of 1m has the lowest total energy consumption and the 5-story corridor DSF with a cavity depth of 0/7m has the highest total energy consumption.Discussion and Conclusion: Due to the high heating needs of the cold climate and energy efficiency of DSF facades, it is necessary to choose the appropriate type for this region. Manuscript profile -
Open Access Article
95 - Evaluating Contemporary Housing in Hot and Arid Climates with a Focus on Climate Responsiveness and Residential Satisfaction (Case Study: Isfahan City, Iran)
Golbarg Sadeghian Mansoureh Tahbaz Pantea HakimianBackground and Objectives: The need for suitable housing is an issue not just for individuals but also for governments. If efficient design is not adopted in the face of climate change, serious consequences will follow, including an increase in environmental issues and, MoreBackground and Objectives: The need for suitable housing is an issue not just for individuals but also for governments. If efficient design is not adopted in the face of climate change, serious consequences will follow, including an increase in environmental issues and, as a result, a deterioration in the quality of human life in various societies. In this regard, it is necessary to identify the existing situation and evaluate the climatic principles employed in the design of contemporary housing, as well as measure living conditions, occupants' comfort, and quality of life in apartments.Material and Methodology: This study's methodology is quantitative, and its strategy is case study, field research, and simulation using Design Builder and Climate Studio software. In addition, the descriptive survey method and statistical analysis with SPSS software using a questionnaire were employed to evaluate residential satisfaction. Therefore, Zaitoun Residential Complex in Isfahan was selected as a case study for post-occupancy evaluation. Findings: According to the questionnaire results, the complex's response to the climate was not very desirable due to disregard for the detailed design of dwelling apartments in the existing situation. The simulation results also revealed that the macro-scale climatic strategies used to optimize energy consumption and the thermal and visual comfort of interior spaces were inadequate. As a result, the energy label for this complex was given an F.Discussion and Conclusion: In terms of residential satisfaction, differences in the design quality of each individual apartment and inaccuracy in designing the details can be problematic, so all climatic principles of microscale design must be considered, as well as the equitable distribution of natural energy sources among each flat. Evaluation of built housing projects not only helps us to understand the performance of present buildings but also creates a knowledge base for the design of future buildings. Manuscript profile -
Open Access Article
96 - Determining the Optimal Inclination Angle for Atrium Daylighting in Tehran Based on Sun Angles and Climatic Features
Alireza Bagheri mohammadali khanmohammadi Haniyeh SanaieianBackground and Objective: Daylight has a positive effect on people's health, employee productivity and property value. However, with the growth of high-rise buildings in populated cities, access to natural light for the lower floors are challenging. Atrium is one of the MoreBackground and Objective: Daylight has a positive effect on people's health, employee productivity and property value. However, with the growth of high-rise buildings in populated cities, access to natural light for the lower floors are challenging. Atrium is one of the strategies for bringing daylight to these floors. Atrium’s daylight performance can be evaluated before construction thanks to computer simulations. Until now, daylight simulation has been limited to one cloudy sky condition. With the help of new methods of computer simulation of daylight, it is possible to study the effects of sun angles and sky conditions throughout the entire hours of a year. This development has made it possible to apply the direct sunlight component to the simulation and study its impacts of architectural features that are related to it. This study focuses on the effect of the angle of inclination of the inner walls of the atrium on the daylight performance of adjacent rooms.Material and Methodology: Different angles of the atrium in the north and south direction have been studied by the method of "Climate-based daylight modeling" for the city of Tehran. (sDA), (ASE) and (UDI) are daylight metrics which have been used in computer simulations.Findings: The inclination of the inner walls of the atrium at an angle of 20 degrees to the south improves all three criteria mentioned in the lower floors of it. However, the inclination of the atrium walls to the north, not only reduces the daylight in the lower parts, but also increases the glare in the upper floors.Discussion and Conclusion: Although the effect of inclination angle on daylight performance of atrium is not as prominent as other factors, the designer can maximize this effect in the early stages of design, with the correct arrangement and prioritization of spaces to benefit from daylight. Manuscript profile -
Open Access Article
97 - Determination of Optimal Operation Strategy for CAES in Fluctuating-Hourly Electricity Market with High Renewable Wind Power Penetration (Case Study: Khorasan Regional Electricity Co.)
Mahdi Ghaemi Asl Mostafa Salimifar Mostafa Rajabi Mashhadi Mohammad Hossien Mahdavi AdeliBackground and Purpose: With influx of sustainable and renewable energy with high penetration into the production system, Compressed Air Energy Storage (CAES) could be used for creation of an acceptable adequate and smooth Electricity production system. CAES plants oper MoreBackground and Purpose: With influx of sustainable and renewable energy with high penetration into the production system, Compressed Air Energy Storage (CAES) could be used for creation of an acceptable adequate and smooth Electricity production system. CAES plants operate on electricity markets by storing energy when electricity prices are low and producing electricity when prices are high. An essential condition for the profitability of the CAES in hybrid systems is appropriate strategy for CAES operation about the sale and purchase of energy. This study aimed to determine optimal operating strategy for CAES systems fluctuating-hourly electricity market with high penetration of renewable wind power. Method: In this study, with simulation of production system of Khorasan Regional Electricity Company power plants which among all, the theoretical optimal strategy provides the highest net income for the storage unit. But since the market price of the upcoming hourly-fluctuating market is not pre-determined, two prognostic and historical practical-operational strategies have used for Setting up compressed air energy storage system. Findings: The results show that prognostic and historical practical-operational strategies, on average have 93% and 89% of theoretical optimal strategy s’ net income, respectively, in all six simulated capacities for compressed air energy storage system. Discussion and Counclusion: Based on the results, it is necessary to use power storage in order to increase grid stability and reliability of production in hybrid systems with high renewable power penetration; because a Black-Start must be ready in grid for Possible Black-Out situations which could provide load of grid in the least possible time. Use a CAES could be a great way that not only guarantees reliability and stability of grid in emergencies, but also is economically feasible and have operational suitable profit. Manuscript profile -
Open Access Article
98 - Simulation of Rainfall-Runoff for Gharesou Watershed Using SWAT Model
Mohammadreza Goodarzi Bagher Zahabiyoun Alireza Massah BavaniBackground and Objective: Rainfall-runoff Simulation is very important in many hydrological studies, such as investigating the effects of climate change on river flow, flood prediction and planning of water resources. SWAT model was used to simulate stream flow transpor MoreBackground and Objective: Rainfall-runoff Simulation is very important in many hydrological studies, such as investigating the effects of climate change on river flow, flood prediction and planning of water resources. SWAT model was used to simulate stream flow transport, sediment and quality variables (nitrogen and phosphorus...) in the watershed areas. SWAT model is a distributed time series model with physical basis. This model has an ability to connect to GIS, in a way that vast volumes of data as information layers such as land use, soil map and the DEM using GIS capabilities are used by the model. The main purpose of this study is testing SWAT model performance as a simulator of flow at the catchment scale. Method: This study attempts to prepare a model for Gharesou catchment. Moreover, the parameters were optimized using SWAT-CUP optimizer. Findings: The model was calibrated for the years 1992-1996 and validated for the years 1998-2000. The coefficient of determination (R2) for monthly flow was equal to 0.82 and Nash-Sutcliffe coefficient (Ens) was equal to 0.8 in the calibration period while in the validation period these coefficients were 0.77 and 0.73, respectively. Conclusion: These results indicate the success of the SWAT model, using optimized parameters, for the stream flow simulation in Gharesou catchment. Manuscript profile -
Open Access Article
99 - Study of Hydrogen Adsorption on FeTi and Single-Walled Carbon Nan tube (SWCN) Using Molecular Dynamic Simulation
Reza Alizadeh Parvin NasiriFinding a new method for storage of huge amount of hydrogen gas with the proper safety manners forusing in vehicles and other equipments has attracted the environmental and energy researching centersattention. In this research by using molecular dynamics simulation the MoreFinding a new method for storage of huge amount of hydrogen gas with the proper safety manners forusing in vehicles and other equipments has attracted the environmental and energy researching centersattention. In this research by using molecular dynamics simulation the adsorption isotherms ofmolecular hydrogen on FeTi nano particles system and Single-Walled Carbon Nanotube (SWCN) atseveral temperatures ranging from 60 to 100 K by calculation of Adsorption coverage. Iso-steric heat,and binding energy were studied at different temperatures and pressures. The amount of Hydrogenadsorbed at the pressure: 10 MPa and temperature: 60 K for the first layer on the FeTi nano particleswas gained between0.28 to 0.35 and inside the SWNT in highest chosen diagonal was 0.008.Consequently the FeTi nano particles can be used as a new and suitable material in order to storage thehydrogen gas in fuel cells. Manuscript profile -
Open Access Article
100 - Prediction of Phenol Adsorption by Sawdust from Wastewater Using Intelligent Methods
Mohsen Keshavarz Tork Ahad Ghaemi Mansour Shirvani Background and Objective: Phenol presence and its derivatives in water and waste water on human health and the environment is one the major concerns. Because of the toxicity of phenol and also because of the presence of even low concentrations in natural resource More Background and Objective: Phenol presence and its derivatives in water and waste water on human health and the environment is one the major concerns. Because of the toxicity of phenol and also because of the presence of even low concentrations in natural resources, water disinfection and oxidation processes can lead to the formation of additional components. This material is one of the most common organic pollutants in water. In this research, adsorption of phenol from wastewater by sawdust was simulated using intelligent techniques. Method: Intelligent techniques including multi-layer Perceptron, radial basis functions network and support vector regression were used. To design the network structure as well as the training and testing of 125 sets of experimental data is used. Performance evaluation criteria and stop network consists of % AARE and, which is used for all three models. Findings: All models compared results showed that the support vector regression with 0.5132 and 0.979, respectively, for %AARE and is the best model. All models are better results than the quadratic polynomial model showed. Discussion and Conclusion: Models showed good agreement with experimental data. The optimum conditions for the removal of phenol were 127.6 mg/l of initial phenol concentration, 0.84 g/l of adsorbent dose, natural pH value of 3.62 and 146.9 min of contact time, under these conditions the maximum removal efficiency was 91.23%. Manuscript profile -
Open Access Article
101 - Evaluating the performance of Sistan and Zahak diversion dams in Sistan River using HEC-RAS hydraulic model
Meysam Amiri Mahdi Kaikha Farzad HassanpourBackground and Objective: Rivers are the main arteries of human life, thus control and proper exploitation of these surface resources require a proper understanding of their behavior and investment in the river improvement. By reviewing and evaluating the projects carri MoreBackground and Objective: Rivers are the main arteries of human life, thus control and proper exploitation of these surface resources require a proper understanding of their behavior and investment in the river improvement. By reviewing and evaluating the projects carried out in this area, their positive and negative aspects can be checked and the obtained results can be used to overcome the projects shortcomings, improve their efficiency and make the future projects more fruitful. Method: Sistan River is the major border river between Iran and Afghanistan and Sistan life depends on it. The length of this river in Iran is about 70 Km. This study attempts to evaluate the performance of Sistan and Zahak diversion dam structures and the structures alongside the river using HEC-RAS hydraulic model. Findings: The results show that these structures increase the maximum Sistan flood power transmission in the absence of these structures from 500 m3/s to 810 m3/s. Considering the importance of estimating Manning roughness coefficient with high precision for hydraulic calculation in the river engineering projects, the main river bed roughness coefficient for the main river and the flood plains of Sistan were estimated as 0.02 and 0.035, respectively. It was also found that Discharge-Return period relation can be expressed as. Existence of diversion dam structures on the unpredictable rivers such as Sistan River may double the flood power transmission in some cases. Discussion and Conclusion: In this study, the effect of 310 m3 per power transmission increse through Sistan River was observed. The reasons for the relatively low impact (the xpectation was more) are slight slope of Sistan plain, and water expansion on flood plain and back water in the direction of Sistan River flow. Manuscript profile -
Open Access Article
102 - Investigation of Pollution Dispersion in Urban Canyons Using an Approach of wind Direction and Trees Position (Case study: Urban Texture in Isfahan)
Seyyed Hossein Hosseini Pouya Bakhtiari Nazanin Nasrollahi Background and Objective: Vegetation that is commonly used in urban design has a significant impact on air quality in the urban canyons. Thus, planners should be aware of vegetation impacts. In Isfahan metropolis, though vegetation covers a considerable portion o More Background and Objective: Vegetation that is commonly used in urban design has a significant impact on air quality in the urban canyons. Thus, planners should be aware of vegetation impacts. In Isfahan metropolis, though vegetation covers a considerable portion of the city, the streets are encountered with pollution problems. In this study, distribution of pollution in urban canyons is evaluated using an optimal model for pollution reduction. Method: A three-dimensional modeling software called ENVI-met along with local and sub-climatic air quality model based on CFD-computational fluid dynamics- is used to study the influence of vegetation on pollution level in urban canyons. In this study, first a sample of real field and next a simpler version of the selected area are simulated. Findings: Different parameters such as height to width ratio in urban canyons, density of trees, location of trees in the streets and gaps between the trees are evaluated. Conclusion: The obtained results show that the increase of wind velocity in the shallow valleys is at the the lower level and the absence of natural obstacles such as trees reduces the level of pollution due to the high velocity of wind at this condition. When trees are located in the center of urban canyons, pollution and tree distances are inversely correlated and pollution level reduces by increasing the distance between the trees. In the other words, the pollution that is caught by the tree canopies decreases with the reduction in tree canopies. Manuscript profile -
Open Access Article
103 - Evaluation of people’s attitude towards noise pollution in the crowded streets of Rasht city in 2000
Marzieh Sadat Ayatollah Shirazi Noushin Birjandi Karim Keshavarz ShokriBackground and Objective: Rainfall-runoff simulation is very important in many hydrological studies, such as investigating the effects of climate change on river flow, flood prediction and planning of water resources. SWAT model was used to simulate stream flow transpor MoreBackground and Objective: Rainfall-runoff simulation is very important in many hydrological studies, such as investigating the effects of climate change on river flow, flood prediction and planning of water resources. SWAT model was used to simulate stream flow transport, sediment and quality variables (nitrogen and phosphorus) in the watershed areas. SWAT model is a distributed time series model with physical basis. This model has an ability to connect to GIS, in a way to cover a vast volume of data as information layers such as land use, soil map and DEM while GIS capabilities are used by the model. The main purpose of this study is testing SWAT model performance as a simulator of flow at the catchment scale. Method: This study attempts to prepare a model for Gharesou catchment. Moreover, the parameters were optimized using SWAT-CUP optimizer. Findings: The model was calibrated for the years 1992-1996 and validated for the years 1998-2000. The coefficient of determination (R2) for monthly flow was equal to 0.82 and Nash-Sutcliffe coefficient (Ens) was equal to 0.8 in the calibration period while in the validation period these coefficients were 0.77 and 0.73, respectively. Conclusion: These results indicate the success of the SWAT model, using optimized parameters, for the stream flow simulation in Gharesou catchment. Manuscript profile -
Open Access Article
104 - Contagious topological dynamics in the Iranian stock market
samad sedaghati Ruhollah Farhadi Mir Feyz FallashamsContagion in financial markets takes place both because of fundamental or non-fundamental reasons like herd behaviors that can increase market risk levels and even end in inefficient allocation of financial resources. Thus, understanding the contagion and its dynamics w MoreContagion in financial markets takes place both because of fundamental or non-fundamental reasons like herd behaviors that can increase market risk levels and even end in inefficient allocation of financial resources. Thus, understanding the contagion and its dynamics will be critical for the participants of financial market. Hence, using network-based epidemic modeling, the study examined the dynamics of contagion in the Iranian stock market from 2011 to 2019 and short-term and long-term scales. To this end, first the correlation network of 46 Iranian stock market groups was developed and then analyzed using short-term and long-term contagion dynamics simulations. The results showed that the extent and speed of contagion is much higher in the short-term than in long-term and in long-term a significant number of groups can be immune to the contagion. However, in long-term the rate of return to pre-contagion status is shorter than in short-term Manuscript profile -
Open Access Article
105 - Dynamic analysis of a comprehensive model of risk management in the banking system using a systems thinking approach
seyyed yahya asadollahi aliasghar taherabady farhad shahveisi farshid kheirollahiThe banking industry, as one of the most important sectors of the economy, plays a very important role in attracting and directing depositors, providing services to people and participating in economic and social development, and in this way, it faces many risks that ar MoreThe banking industry, as one of the most important sectors of the economy, plays a very important role in attracting and directing depositors, providing services to people and participating in economic and social development, and in this way, it faces many risks that are particularly important to manage and control. One of the important steps for management of the risk is determination of the factors affecting on it. The purpose of the study is to present a dynamic model for bank liquidity risk management. For this purpose, system dynamics methodology has been used to find the risk-generating structure and provide an effective solution to manage it. In this method, the stimulation of different scenarios is possible by providing a mathematical model. In this regard, the results of the implementation of the four decision-making scenarios on the model were simulated and analyzed. The results show that decreasing the legal deposit and deferred loans and increasing the deposit attraction will affect on reducing banks' liquidity risk. Manuscript profile -
Open Access Article
106 - Calculating Tail Value at Risk Using a EGARCH-Extreme Learning Machine Model And The long-term forecast approach in the insurance industry
reza raei Azam Honardoust ezzatolah abbasianOne of the most important methods for market risk measurement is Value-at-risk (VaR) that financial institutions such as banks, insurers and investment funds use them extensively. VaR as a risk measure is heavily criticized for not being sub-additive, thus the researche MoreOne of the most important methods for market risk measurement is Value-at-risk (VaR) that financial institutions such as banks, insurers and investment funds use them extensively. VaR as a risk measure is heavily criticized for not being sub-additive, thus the researchers focuses on the assessment of the Tail value-at-risk (TVaR), and this measure is using on the Basel Committee on Banking and Solvency II of Europe and Swiss Solvency Test (SST). this paper focuses on TVaR to measure the risk of the stock market. Considering that the time horizon of the risks of an insurer unlike banks is annually. thus, to calculate the TVaR, we use of the two methods of the variance-covariance approach with the EGARCH-Extreme learning Machine model to volatility forecasting and use of square-root-of-time rule; and Filtered Historical simulation model. The results of using the daily returns of the Tehran Stock Exchange Index for 1388 to 1396 confirm that the EGARCH-Extreme learning Machine model with use of square-root-of-time rule performs better in TVaR calculation in terms of efficiency and accuracy. Manuscript profile -
Open Access Article
107 - Portfolio VaR Modelling using EVT-Pair-Copulas Approach
Ali Souri Saeed Falahpor Ali Foroush Bastani Ehsan AhmadiThe purpose of this research is to model Value-at-Risk (VaR) of portfolio with EVT-Pair-Copulas approach. In the financial literature, a significant amount of empirical studies have been done on the characteristics of financial assets returns and researchers have found MoreThe purpose of this research is to model Value-at-Risk (VaR) of portfolio with EVT-Pair-Copulas approach. In the financial literature, a significant amount of empirical studies have been done on the characteristics of financial assets returns and researchers have found a set of stylized facts about this subject. In this regard leptokurtic, left-skewed, weak autocorrelation, volatility clustering, and heteroscedasticity can be mentioned. Any estimation of risk without considering these characteristics or using unrealistic assumptions about financial assets returns increases the probability of failure in the risk management process. For this purpose, at first, the marginal distributions of returns are obtained using extreme value theory (EVT). Concerning characteristics of financial assets returns and also the primary filter to apply EVT, we use heteroscedasticity models for the marginal distributions of assets. Then the structure of the dependence between different stocks is estimated by using C-Vine, D-Vine, and R-Vine pair copula models. Afterward, the VaR of portfolio is estimated using the Monte Carlo simulation method. The final results show that the model with GARCH marginal distribution and R-Vine pair copula has been able to achieve the best performance among rival models at 95% confidence level. Manuscript profile -
Open Access Article
108 - Installment Option Valuation by Least Squares with Checking the Solution Convergence
Hamed Hamedinia Mahdi RezyatiAn installment option is a European option in which the holder pays the option as a series of payments instead of paying all up-front. If all payments pay, the holder will be able to exercise the option at maturity time. However, the installment option will be terminate MoreAn installment option is a European option in which the holder pays the option as a series of payments instead of paying all up-front. If all payments pay, the holder will be able to exercise the option at maturity time. However, the installment option will be terminated even if one installment is not paid. This study is divided into two sections. First, the importance of installment option is studied; the relationship between installment option and Venture Capital is explained; and it is studied how BLS model is failed to evaluate the installment option. As the exact evaluation of installment option is extremely complicated and usually intractable, Monte Carlo simulation and Least Squares (LS) have been applied to evaluate installment option. Second, the three optimum values, function type, number of base variables and number of simulated path, as important factors on this method are calculated. So, numerical valuation converges to exact solution. Manuscript profile -
Open Access Article
109 - Rating parametric and nonparametric methods for estimating the expected shortfall and value at risk
Mohammadreza Rostami Alireza Saranj Zoha SavariFinancial market developments make it more important to measure market risks correctly. In this paper we investigatethe forecasting accuracy of different historical simulation models in relation to the risk measure expected shortfall and in comparison to established par MoreFinancial market developments make it more important to measure market risks correctly. In this paper we investigatethe forecasting accuracy of different historical simulation models in relation to the risk measure expected shortfall and in comparison to established parametric models.we used historical simulation, mirrored historical simulatin,volatility weighted historical simulation,filtered historical simulation and GARCH(1,1) models.The data that we used consists of Tehran stock exchange market index from 2010 to 2014.Christofferson backtest used for value at risk and mc neil & frey backtest used for expected shortfall. According to unconditional coverage backtesting ,mirrored historical simulation model was rejected and others were accepted and according to independence backtesting all models were accepted thus the christoferson backtest will omit the mirrored historical simulation model and According to mc neil and frey backtest all models were accepted and finally the model confidence set procedure showed that semi parametric models are best models to forecast expected shortfall. Manuscript profile -
Open Access Article
110 - The Evaluation of Venture Capital as an Installment Option and Real Options
Ali Foroush Bastani Hamed Hamedi NiaThe evaluation of VC projects (companies) is very important because the present value of them defines the proportion of Entrepreneur’s profit from all future profit of that project (company). In this article, VC projects have been evaluated by using Real Options a MoreThe evaluation of VC projects (companies) is very important because the present value of them defines the proportion of Entrepreneur’s profit from all future profit of that project (company). In this article, VC projects have been evaluated by using Real Options and Installment Option. In order to doing that, the lower and upper bounds based on “No-Arbitrage” condition are obtained for pricing installment option in both discrete and continuous time. These bounds have been used for pricing Venture Capital projects. With simulation of stock price by Monte Carlo, they have been compared with DTS bounds (the bounds obtained by other authors). Results reveal the bounds in the present study are more effective than DTS bounds. For more confidence, the Bounds have been compared with Monte Carlo simulation based on Least Square approach (we have changed that approach to be used in the evaluation of Installment Option); as expected, they have confirmed each other. Manuscript profile -
Open Access Article
111 - Investment Project Valuation Using Real Option Approach(The Case of a 500 MV Power Generation Plant)
Mortaza Baky Haskuee Rojin DavoodiDynamic and complicated circumstances of economic activities, and consequently increase in risks require an efficient analytical method of investment and financing decision making in which does not suffer from traditional methods shortcoming such as stationarity. Real o MoreDynamic and complicated circumstances of economic activities, and consequently increase in risks require an efficient analytical method of investment and financing decision making in which does not suffer from traditional methods shortcoming such as stationarity. Real option analysis developed in response to this requirement.This paper provides a framework to study advantage of using real option theory in evaluating power generation projects in comparison to traditional methods. First, it uses abandon option and its different real option pricing methods, then compares to traditional methods. To compare traditional and real option methods, it uses Monte Carlo simulation.The results show that real option pricing methods do not differ significantly, because when time steps increase, option value increases and all methods converge. Monte Carlo simulation results show that in real option methods risk decreases and return increases in comparison to traditional methods. Manuscript profile -
Open Access Article
112 - پیش بینی الگو برای واحدهای تصمیم گیرنده در تحلیل پوششی داده ها
مرتضی شفیعی فرهاد حسین زاده لطفی هیلدا صالحاگرچه تحلیل پوششی داده­ها یک ابراز قدرتمند برای ارزیابی عملکرد واحدهای تحت ارزیابی می­باشد ولی این تکنیک دارای محدودیت­هایی نیز می­باشد. به عنوان نمونه یکی از محدودیت­های این روش، ارزیابی عملکرد سیستم براساس ورودی و خروجی­های قدیم است بنابر Moreاگرچه تحلیل پوششی داده­ها یک ابراز قدرتمند برای ارزیابی عملکرد واحدهای تحت ارزیابی می­باشد ولی این تکنیک دارای محدودیت­هایی نیز می­باشد. به عنوان نمونه یکی از محدودیت­های این روش، ارزیابی عملکرد سیستم براساس ورودی و خروجی­های قدیم است بنابراین نتایج ارزیابی به­دست آمده از مدل­های کلاسیک DEA، برای پیش بینی تغییرات کارایی واحدها در آینده و در نتیجه ارایه الگوی مناسب برای رسیدن به یک واحد کارا، کاربردی نمی­باشد . بنابراین هدف این مقاله پیشنهاد یک روش جدید به منظور پیش بینی کارایی سیستم براساس ورودی و خروجی شبیه سازی شده با استفاده از سیستم پویا و تکنیک­های شبیه سازی است. زیرا با پیش بینی کارایی واحد تحت ارزیابی، مدیران در یک سیستم می­توانند برنامه ریزی دقیق­تری برای آینده داشته باشند. برای این منظور با استفاده از یک حلقه بازخورد، ورودی­ها و خروجی­ها در واحدهای تصمیم گیرنده در آینده مورد پیش بینی قرار گرفت سپس با استفاده از مدل CCR و ورودی­ها و خروجی­های پیش­بینی، شده به پیش بینی کارایی واحد تحت ارزیابی پرداختیم. Manuscript profile -
Open Access Article
113 - مطالعه عددی دو مکانیزم واکنشی روی شعله Delft III با استفاده از شبیهسازی گردابههای بزرگ و رهیافت بستگی ممان مشروط
مهدی زکیانی رودسرییک مدل بستگی ممان مشروط همراه با رویکرد پیشرفته LES برای شبیهسازی شعله هدف کارگاه آموزشی TNF، شعله متان پایلوت Delft II، استفاده شده است. برای مدلسازی مقیاسهای زیرشبکهای، در این پژوهش از مدل اسماگورینکی ثابت استفاده شده است. مدل بستگی ممان مشروط مرتبه اول برای مدلس Moreیک مدل بستگی ممان مشروط همراه با رویکرد پیشرفته LES برای شبیهسازی شعله هدف کارگاه آموزشی TNF، شعله متان پایلوت Delft II، استفاده شده است. برای مدلسازی مقیاسهای زیرشبکهای، در این پژوهش از مدل اسماگورینکی ثابت استفاده شده است. مدل بستگی ممان مشروط مرتبه اول برای مدلسازی اندرکنش جریان آشفته-واکنش شیمیایی استفاده میشود. برای محاسبه سرعت مشروط و اتلاف اسکالر مشروط از میانگینگیری حجمی مشروط با هموارسازی استفاده میشود. برای مطالعه اثر مکانیزم شیمیایی، از دو مکانیسم مختلف واکنش متان استفاده میشود. اولین مکانیسم شیمیایی متان، یک مرحلهای با 4 گونه و 1 واکنش است. مکانیسم دوم، مکانیسم شیمیایی اسموک است که از 16 گونه و 25 واکنش تشکیل شده است. برای انتگرالگیری در زمان،معادلات ناویر-استوکس فیلتر شده، از یک روش پیشبینیکننده- تصحیحکننده دقیق مرتبه دوم زمانی استفاده میشود. نشان داده شده است که مکانیسم واکنش تقریباً هیچ تأثیری بر میدان سرعت و میدانهای اسکالر ندارد. با این حال، میدان دما با استفاده از مکانیسم واکنش پیچیدهتر تحت تأثیر قرار میگیرد. Manuscript profile -
Open Access Article
114 - برآورد پارامترهای توزیع بر نوع 12 بسط یافته با استفاده از اصل بیشینه سازی انتروپی با بر پایه ی مقادیر رکورد k
مهدی رجایی سلماسیدر این مقاله روش جدیدی برای تخمین پارامترهای توزیع بر نوع 12 بسط یافته با استفاده از اصل بیشینه سازی انتروپی بر پایه ی مقادیر رکورد k به کار گرفته شده است. از شبیه سازی مونت کارلو برای ارزیابی عملکرد این روش و مقایسه آن با روشهای شناخته شده دیگر استفاده شده است. نتایج ش Moreدر این مقاله روش جدیدی برای تخمین پارامترهای توزیع بر نوع 12 بسط یافته با استفاده از اصل بیشینه سازی انتروپی بر پایه ی مقادیر رکورد k به کار گرفته شده است. از شبیه سازی مونت کارلو برای ارزیابی عملکرد این روش و مقایسه آن با روشهای شناخته شده دیگر استفاده شده است. نتایج شیبیه سازی نشان دادند که روش اصل بیشینه سازی انتروپی عملکرد بهتری داشته است. Manuscript profile -
Open Access Article
115 - توزیع پیشین جفریز برای خانواده توزیع های نمایی چوله بریده شده
سعید میرزاده انیس ایرانمنش احسان ارمزدر این مقاله توزیع پیشین جفریز مستقل برای برآورد بیز پارامترهای مجهول مکان، مقیاس و چولگی در خانواده توزیع های نمایی بریده شده چوله(TESSD) مورد مطالعه قرار گرفته است. با وجود ناسره بودن توزیع پیشین، سره بودن توزیع پسین اثبات شده است. برای ارزیابی عملکرد برآوردهای بیز حا Moreدر این مقاله توزیع پیشین جفریز مستقل برای برآورد بیز پارامترهای مجهول مکان، مقیاس و چولگی در خانواده توزیع های نمایی بریده شده چوله(TESSD) مورد مطالعه قرار گرفته است. با وجود ناسره بودن توزیع پیشین، سره بودن توزیع پسین اثبات شده است. برای ارزیابی عملکرد برآوردهای بیز حاصل در مدل معرفی شده و مقایسه آن با مدل چوله آزالینی، مطالعات شبیه سازی به روش های مونت کارلو برای چند توزیع خاص از این خانواده انجام شده است. نتایج حاصله برتری برآوردهای بیز در خانواده TESSD نسبت به توزیع های چوله آزالینی را نشان می دهد. Manuscript profile -
Open Access Article
116 - A Hybrid Heuristic Algorithm to Solve Capacitated Location-routing Problem With Fuzzy Demands
A. ‎Nadizadeh‎‎ A. Sadegheih A. Sabzevari ‎Zadeh‎ -
Open Access Article
117 - Variance analysis of control variate technique and applications in Asian option pricing
B. Fathi ‎Vajargah‎ A. Salimipour‎ S. Salahshour‎ -
Open Access Article
118 - Evaluating Quasi-Monte Carlo (QMC) algorithms in blocks decomposition of de-trended
K. Fathi Vajargah -
Open Access Article
119 - Modeling of Groundwater Quality Parameters Using Artificial Neural Network and Geostatistics Models (Case Study: Zeidoun plain)
Abdol Amir Echreshzadeh Aslan EgdernezhadBackground and Aim: One of the obstacles to develop sustainable is the poor quality of water. The assessment of water quality is usually based on chemical decomposition and measurement of chemical parameters of water. Measuring these parameters in big area is costly and MoreBackground and Aim: One of the obstacles to develop sustainable is the poor quality of water. The assessment of water quality is usually based on chemical decomposition and measurement of chemical parameters of water. Measuring these parameters in big area is costly and time-consuming, as result it required to estimating methods for prediction of those parameters. The purpose of this study is to model the groundwater quality parameters of Zeydoon plain using ANN+PSO and geostatistics models. Methods: For this purpose, the information of 42 observation wells in Zeidoon plain on a monthly basis for 7 years has been used. Neural network model inputs including qualitative parameters SO42- ، pH ، HCO32-، Na+، Mg2+، Ca2+، TDS، SAR and EC were considered. Findings: The results of simulation of groundwater quality parameters using ANN + PSO model showed that in SAR simulator model the highest simulation accuracy is related to the model with sigmoid logarithm function, in EC simulator model the highest accuracy is similar. The construction is related to the model with the stimulus function of the sigmoid tangent. Also, in the TDS simulator model, the highest simulation accuracy of the model with the sigmoid tangent stimulus function was obtained. As RMSE and MAE have the lowest value and R2 index has the highest value. The results of simulation of groundwater quality parameters using the geostatistical model showed that the highest accuracy of the kriging model in the simulation is related to EC, SAR and TDS parameters, respectively. Discussion and Conclusion: Finally, comparing the results of comparing the results of ANN + PSO model and Kriging model showed that ANN + PSO model is more accurate in simulating groundwater quality parameters of Zidon plain than Kriging model. Also, the results of this research showed that the combination of intelligent models with optimization algorithms with correct architecture and complete model inputs are used as a useful tool for simulating groundwater quality parameters. Manuscript profile -
Open Access Article
120 - Plants Performance on Noise Pollution Reduction based on Visual Characteristics Perspectives
Ahmad Hami Neda khodayariBecause of the rapid industrialization, urbanization and other communication and transport systems, noise pollution has reached to a disturbing level over the years. Plants have been suggested as an affordable and natural construction to mitigate outdoor noise pollution MoreBecause of the rapid industrialization, urbanization and other communication and transport systems, noise pollution has reached to a disturbing level over the years. Plants have been suggested as an affordable and natural construction to mitigate outdoor noise pollution in comparison to concrete, metal, plastic and other man-made materials. The goal of noise control is to promote relaxation, satisfaction and well-being in urban residents. Green belt is known as one of the most important and effective method in residential areas to reduce noise pollution caused by road traffic in urban areas. A row of trees may be an effective technique than other barrier in decreasing noise pollution. In recent years, several methods have been used for measuring the effects of landscape elements on noise reduction. This study attempts to review the applied methods herein. The results showed that green elements not only mitigate noise pollution but also play important role in creating attractive scenes for people which may enhance human tolerance for noise pollution. In addition, organization of plants and their aesthetic values may have positive role on noise reduction. Manuscript profile -
Open Access Article
121 - Modeling the emission and spread of air pollutants in Beyhaqi passenger terminal of Tehran under different scenarios
maryam karimi farzam Babaie Hooman Bahmanpour ali mohammadi Mohammad Reza TapeshBackground and Objective: The purpose of this research is to measure air pollutants (especially PM10) in Beyhaqi Terminal of Tehran and to model the release of this pollutant under various conditions. Material and Methodology: In order to measure the pollutant of suspe MoreBackground and Objective: The purpose of this research is to measure air pollutants (especially PM10) in Beyhaqi Terminal of Tehran and to model the release of this pollutant under various conditions. Material and Methodology: In order to measure the pollutant of suspended particles with a diameter of 10 microns (PM10), a portable device model Grimm 108/109 was used. In the selected points, sampling was done once a month during the year, three days a month and 3 times a day, and the sampling was done at different times of the day, i.e. morning, noon and evening, according to the increase and decrease of vehicle traffic. And for the purpose of modeling, Austal view, version 7 software was used. Findings: The results showed that the concentration measured in the autumn and winter seasons was higher than the first six months of the year. Since in the standard of the World Health Organization, the daily limit for this pollutant is 50 micrograms per cubic meter, it can be seen that in the first scenario, in some areas (distances less than 300 meters from the source), the concentration of the pollutant exceeded the standard. The rest of the ranges are within the standard range. In the second scenario and based on the emission reduction factor of 70%, it was determined that all areas are within the standard range. Discussion and Conclusion: Finally, reducing the stopping time of cars, not turning on lights and using exhaust absorbent filters will help to reduce the emission of suspended particles. Manuscript profile -
Open Access Article
122 - Comparison performance of two models DRAINMOD and Artificial Neural Network (ANN) for the forecast of water table
Atefeh Sayadi Shahraki Abd Ali Naseri Amir Soltani MohammadiAbstract Farm experiments are useful in knowing the drainage systems but they have considerable limitations including the inability to use them as prediction tools. Application of simulation models can cover these deficiencies but it is necessary to use the field data MoreAbstract Farm experiments are useful in knowing the drainage systems but they have considerable limitations including the inability to use them as prediction tools. Application of simulation models can cover these deficiencies but it is necessary to use the field data to evaluate the accuracy of the model. In this study, Artificial Neural Networks (ANN) and model DRAINMOD are used to predict water table. For this purpose, field R9-11 of the Debal Khazaei sugarcane plantation is selectedand Input parameters of the models, including fluctuations in water table, the volume of irrigation water, drainage flow, Climatic data, Soil physical properties and Drainage system parameters were measured from November 2013 to October 2014. The results have showed that the artificial neural network method has a highest accuracy in predicting water table. So that the average RMSE between measured and simulation with Artificial Neural Networks and DRAINMOD obtained 0.02 and 16.8 respectively. Manuscript profile -
Open Access Article
123 - Green Rooftop; approach towards qualitative improvement in microclimatic and tourism attraction in Sustainable city
Marjan Khanzadeh NatanziToday, thinkers and environment and urban designers are concerned about the inevitable growth of metropolises trying to propose some methods to moderate its effects. This has resulted in some patterns that reduce its disturbing effects along with improving the quality o MoreToday, thinkers and environment and urban designers are concerned about the inevitable growth of metropolises trying to propose some methods to moderate its effects. This has resulted in some patterns that reduce its disturbing effects along with improving the quality of life in these cities. Mankind is aware of the value of the sustained spaces and is trying to answer his needs, holding permanent horizons in view. These efforts resulted in patterns of sustained metropolises, a steady and dense city. But this human achievement is not, like his other achievements, without a consequence. Research shows that increase in the density of the city disturbs the balance in the illumination of the city spaces in addition to damaging the heat transfer between the earth, buildings and the atmosphere. It also affects the internal heat of the city, increases the temperature and influences the velocity of the wind. In another view, higher density means a decreased opportunity for building green spaces resulting in a demolished desirability of the spaces. It also results in crowdedness and brings about air pollution. As flat planes that occupy a large share in such dense cities, roofs are of great importance to us. Good effects of green patterns on improving the climatic conditions like moderating undesirable consequences of dense cities decrease of heat and sun waves, the velocity of the wind and pollution posits a good potential in plans. Bruce’s non-hydrostatic model is used in this research to simulate a site in three conditions of its current state, increase in density and greening the roofs. Then effects of rooftop greening especially on air temperature and wind velocity are studied. Finally a comparison is made between the results of this research and other researches done in this field t achieve a broader insight into how greening the roofs may affect low-scale environmental conditions specially in dense cities by using plants in higher scales. There is also a discussion about other benefits of this approach to show its value in architectural and urban projects. Manuscript profile -
Open Access Article
124 - A Review of Rural Land Use Planning Models
Azade Mehri Abdolrassoul SalmanmahinyNowadays, environmental crises caused by the irrational use and land conversion, have made ecological evaluation and land use planning ever more essential. Different methods are used in land evaluation and land use planning. In this paper, land use planning models have MoreNowadays, environmental crises caused by the irrational use and land conversion, have made ecological evaluation and land use planning ever more essential. Different methods are used in land evaluation and land use planning. In this paper, land use planning models have been reviewed and techniques with different objectives, applications, and land uses have been identified. Reviewing the existing land use planning models included the analysis and evaluation of their main characteristics. Land use planning models have been studied in five groups, including expert systems, multi-criteria evaluation, mathematical programming, mixed techniques, and spatial simulation models. Each of these groups has several sub-groups and the models studied in this paper may constitute Decision Support Systems (DSSs) that are usually integrated into a GIS. The aim of this paper is to analyze and offer a structured overview towards facilitating selection of a particular and appropriate method for any land use planning application Manuscript profile -
Open Access Article
125 - Greening the Rooftop; One step towards microclimatic amelioration and tourism attraction in Sustainable city
Marjan Khanzadeh NatanziAbstractToday, thinkers and environment and urbandesigners are concerned about the inevitablegrowth of metropolises trying to propose somemethods to moderate its effects. This has resultedin some patterns that reduce its disturbing effectsalong with improving the qualit MoreAbstractToday, thinkers and environment and urbandesigners are concerned about the inevitablegrowth of metropolises trying to propose somemethods to moderate its effects. This has resultedin some patterns that reduce its disturbing effectsalong with improving the quality of life in thesecities.Mankind is aware of the value of the sustained spacesand is trying to answer his needs, holding permanenthorizons in view. These efforts resulted in patterns ofsustained metropolises, a steady and dense city.But this human achievement is not, like his otherachievements, without a consequence. Research showsthat increase in the density of the city disturbs thebalance in the illumination of the city spaces in additionto damaging the heat transfer between the earth, buildingsand the atmosphere. It also affects the internalheat of the city, increases the temperature andinfluences the velocity of the wind. In anotherview, higher density means a decreased opportunityfor building green spaces resulting in ademolished desirability of the spaces. It alsoresults in crowdedness and brings about airpollution.As flat planes that occupy a large share in such densecities, roofs are of great importance to us. Good effectsof green patterns on improving the climatic conditionslike moderating undesirable consequences of densecities decrease of heat and sun waves, the velocity ofthe wind and pollution posits a good potential in plans.Bruce’s non-hydrostatic model is used in this researchto simulate a site in three conditions of its current state,increase in density and greening the roofs. Theneffects of rooftop greening especially on air temperatureand wind velocity are studied. Finally a comparison ismade between the results of this research and otherresearches done in this field t achieve a broader insightinto how greening the roofs may affect low-scaleenvironmental conditions specially in dense citiesby using plants in higher scales. There is also adiscussion about other benefits of this approach toshow its value in architectural and urban projects. Manuscript profile -
Open Access Article
126 - Lie Permit from the viewpoint of narratives
Hossein Sharif Asgari Hashem AndisheThis article deals with “lie permit from the viewpoint of narratives”. We initially have studied the first case of lie permit that is the existence of exigency and the reasons of lie permit if necessary and in the continuation, we have pointed MoreThis article deals with “lie permit from the viewpoint of narratives”. We initially have studied the first case of lie permit that is the existence of exigency and the reasons of lie permit if necessary and in the continuation, we have pointed to the argumentation of non-binding promise and conciliation among Muslims. Thenceforth, the debate on dissimulation, grandiloquence, and jocular lie is considered and at the end, sham oath is mentioned. Manuscript profile -
Open Access Article
127 - Jurisprudence study of the relation and its legal effects in human simulation
mostafa ameri siahooyi alireza asgari mohammad mahdi ahmadi ahmad moradkhaniSimulation or cloning is one of the nascent methods of the medical world in the treatment of infertility, which, unlike normal reproduction, is a living creature without fertilization and a combination of a physical cell and a sexual cell. The right to assign the child MoreSimulation or cloning is one of the nascent methods of the medical world in the treatment of infertility, which, unlike normal reproduction, is a living creature without fertilization and a combination of a physical cell and a sexual cell. The right to assign the child to his or her parent is one of the most fundamental human rights. This article attempts to answer the questions and challenges in the jurisprudential review of the status of parental affairs in a child. Here, reproduction of the dual origin (parent) is compared to the genetic characteristics of the child and reproduction simulations of the parent (father or mother), and, moreover, the simulation license in the context of the conjugation relationship or the outside It is also being discussed. Every available ideas gives different results that various aspects of it are considered in the judgments of the Imams, and, finally, it is stated that, firstly, there is a relation in simulation. Secondly, the parent and the owner of the cell Cloned as the child's parent, that is, the owner of the cell and the child derived from the owner of the cell, are also twins. Also, the works of Nasab will be include the respect of marriage, custody of the child, Qahiri province, the obligation to spend, and inheritance. Manuscript profile -
Open Access Article
128 - An investigation and comparison of effective factors on variations of Honsfield numbers in CT scanners
Ameneh Abdollahi Qomi Parviz Zobdeh Saeed Karim Khani ZandiObjectives:This study was conducted to evaluate effective factors in variation of amount of Handsfield numbers in different CT scanners, considering the importance of CT number equivalence in diagnostic programs and cancer treatment by radiotherapy. Providing the better MoreObjectives:This study was conducted to evaluate effective factors in variation of amount of Handsfield numbers in different CT scanners, considering the importance of CT number equivalence in diagnostic programs and cancer treatment by radiotherapy. Providing the better functional solutions for CT calibration, improving the quality of diagnostic and therapeutic programs, the emphasis on accepted tolerance and controlling the errors resulted from dose calculated by treatment planning systems were studied.Methods:The process performed on raw data obtained during the calibration procedure on ten CT scanners in different radiotherapy centers in IRAN. This quality control tests performed by a selected approved Iranian company.Results: This research focused on CT Number correctness and accuracy tests section in calibration procedure. The factors influencing the variation of Honsfield numbers in CT scans were evaluated by analyzing the obtained data. Data are compared with other factors that cause to alter Handsfeld CT number and reported in previous researches.Creating an error and changing the numbers of CTs causes change in the CT density curve and ultimately effects on treatment plan and the received patient dose. Therefore, it should minimize the error rate by evaluating the effective factors of the TPS. The main factors affecting on Honsfield numbers are: photon energy, the characteristics of materials in phantoms used for calibration of the systems, physical phantom shape and diameter, patient/phantom position and image reconstruction algorithm.Conclusion: It is strongly recommended that a well-documented assessment program is required to ensure Honsfield numbers changes in the confined range of treatments. Manuscript profile -
Open Access Article
129 - QSAR studies, docking and molecular dynamics simulation of a number of heterocyclic compounds including nitrogen oxide as new anti-tuberculosis agents
Ghasem Ghasemi Babak Motahary Robabe SayadikordAbadiObjectiv: Mycobacterium tuberculosis (Mtb), is agent of tuberculosis. A series of novel N‑Oxide-Containing Heterocycles have been reported as selective Mycobacterium tuberculosis inhibitors. QSAR, Docking, and Molecular Dynamics Simulation studies were investigated.Mate MoreObjectiv: Mycobacterium tuberculosis (Mtb), is agent of tuberculosis. A series of novel N‑Oxide-Containing Heterocycles have been reported as selective Mycobacterium tuberculosis inhibitors. QSAR, Docking, and Molecular Dynamics Simulation studies were investigated.Materials and Methods: Imperialist Competitive Algorithm (ICA), Partial least squares (PLS), Principle Component Regression (PCR), Least Absolute Shrinkage, Selection Operator (LASSO), and Monte-Carlo simulation were used to create QSAR models. The molecular docking and molecular dynamics simulation were carried out on Mycobacterium tuberculosis (Mtb) strain H37Rv (PDB: 4XGQ).Findings: Atomic masses, atomic sanderson electronegativities, Ghose–Viswanadhan-Wendoloski antiinfective-like index and Ghose –Viswanadhan-Wendoloski hyptonic-like index were important in our study. The SMILES files have been used with coralsea software. The root-mean square errors of the training set, and the test set for ICA model, were 0.2970, 0.1395 respectively. The results of the Monte-Carlo method were the following: n=7, R²=0.9931, Q²=0.9857, MAE=0.039 (Training set); n=6, R²=0.9413, Q²=0.9107, MAE=0.367 (Test set).Conclusion: Molecules 10 and 11 were presented as the most stable ones that may be introduced for further investigations, including clinical experiments. Manuscript profile -
Open Access Article
130 - A DFT and Molecular Dynamics Study on Inhibitory Action of Three Amine Derivatives on Corrosion of Carbon Steel
Mohammad Hossein Ghorbani Maryam Dehdab -
Open Access Article
131 - Investigation on the Simultaneous Effects of Zn Additions and Critical Ingate Velocity on the Hot Tearing Susceptibility of A356 and A206 Aluminum Alloys
M. Ghambarian S.M.A. Boutorabi F. Shahri -
Open Access Article
132 - Simulation of Steel Sheets Cold Rolling in Sticky Friction Conditions to Reduction of Scrap and Tools Wear
Arab N -
Open Access Article
133 - Physical and Numerical Investigations of Gas Turbine Blades Failure
H.R. Faridi A. Momeni M. Mohammadpour V. Sarfarazi -
Open Access Article
134 - Investigating the Effect of Cutting Condition on the Plastic Energy in Turning Process of AISI 1050
Mohammad Meghdad Fallah Seyyed Reza Hamzeloo -
Open Access Article
135 - Study of the Early Development Factors of Failure in Valves of Reciprocating Compressors by Experimental and Numerical Simulation
Mostafa Sayahbadkhor Ali Mozafari Alireza Naddaf Oskouei -
Open Access Article
136 - Preform and Process Design of Ti-6Al-4V Compressor Blade using Equipotential Lines and 3D FE Simulation
M. Soleimanzadeh M.M. Fallah -
Open Access Article
137 - Process Parameters Optimization in Gas Blow Forming of Pin-type Metal Bipolar Plates using Taguchi and Finite Element Methods
M. Moradian A. Doniavi V. Modanloo V. Alimirzaloo -
Open Access Article
138 - A study on the numerical simulation of thermo-mechanical behavior of the novel functionally graded thermal barrier coating under thermal shock
N. Nayebpashaee H. Vafaeenezhad S. M. M. Hadavi S. H. Seyedein M. R. Aboutalebi H. Sarpoolaky -
Open Access Article
139 - Time-Dependent Reliability Analysis of Mechanical Structures using an Analytical Approach
Mohammad Reza Moarefzadeh -
Open Access Article
140 - Ultrasonic Assisted Equal Channel Angular Extrusion Process (UAECAE)
Hamed Razavi Yaghoub Tadi Beni Mohammad Baharvand -
Open Access Article
141 - The Numerical Modeling to Study the Multi-Pass Friction Stir Processing on Magnesium Casting Alloy AZ91
hoda agha amini fashami Mohammad Hoseinpour Gollo Nasrollah Bani Mostafa Arab Bahram Nami -
Open Access Article
142 - Modeling and Simulation of 6DOF Robot Manipulators with Tactile Position-Force Control
Mohammad Reza Najafi Ahmad Khoogar Hadi Darabi -
Open Access Article
143 - Design, Numerical and Experimental Investigation of High Swirling Flow in an Annular Combustion Chamber
Zahra Ghahramani Masoud Zareh Hossein Pourfarzaneh Farshad Pazooki -
Open Access Article
144 - Simulation of Friction Stir Extrusion using Smoothed Particle Hydrodynamics (SPH)
Mostafa Akbari Mansour Hakimollahi parviz Asadi Hossein Rahimi Asiabaraki -
Open Access Article
145 - Heat Transfer of Wavy Microchannel Heat Sink with Microtube and Ag/Water-Ethylene Glycol Hybrid Nanofluid
Akram Jahanbakhshi Afshin Ahmadi Nadooshan morteza Bayreh -
Open Access Article
146 - Numerical Simulation of Hot Forging Process of KIA Car Brake’s Output Shaft
saeid Hashemian Peyman Mashhadi Keshtiban Abuzar Es'haghi Oskui -
Open Access Article
147 - Evaluation of Sperling’s Index in Passenger and Freight Trains Under Different Speeds and Track Irregularities
sajjad sattari Mohammad Saadat Sayed Hasan Mirtalaie mahdi salehi ali soleimani -
Open Access Article
148 - Numerical Analysis of The Crater Diameter and Penetration Depth of The Target Due to The Impact of Short-Rod Segmented Projectiles at High Velocity
Behnam Yasemi Hamid Soleimanimehr Hossein Khodarahmi sadegh rahmati Najmeh khazraiyan -
Open Access Article
149 - Simulation of a Freight Train and The Effect of Wheel Flat Defect on The Wheel/Rail Dynamic Forces
Sajjad Sattari Mohammad Saadat Sayed Hasan Mirtalaie Mehdi Salehi Ali SoleimaniWheel/rail interaction is one of the most important research topics in railway engineering and generally includes impact response, vibrations, and track safety. Track structure failures caused by wheel/rail impact dynamic forces can lead to significant economic loss thr MoreWheel/rail interaction is one of the most important research topics in railway engineering and generally includes impact response, vibrations, and track safety. Track structure failures caused by wheel/rail impact dynamic forces can lead to significant economic loss through damage to rails, ballast, fastening system, etc. Wheel/rail impact forces occur due to defects in wheels and/or rails such as wheel flats, irregular wheel profiles, rail corrugation, etc. A wheel flat can cause a large dynamic impact force as well as high frequency forced vibrations, which will eventually lead to damage to the train and track structure. In the present work, a freight train (3D model) was used to analyze the dynamic impact caused by the wheel flat using UM software. The effects of wheel flat depth and length (0, 0.2, 0.5, 1, 1.5, 2, and 3 mm) at two speeds of 50 and 80 km/h on wheel/rail dynamic forces have been investigated. The results showed that the presence of a wheel flat defect significantly increases the wheel/rail dynamic impact. For example, by increasing the wheel flat depth to 3 mm, the values of maximum force at speeds of 50 and 80 km/h have changed by about 235% and 400%, respectively. Manuscript profile -
Open Access Article
150 - A Study on The Effects of Different Pad Materials on Brake System Performance of a High-Capacity Elevator by FEM Simulation
Mohammad Sajjad Mahdieh Farshad Nazari Ali Riyadh KhairullahThe brake system must be reliable and display unchanging action throughout its use, as it guards the health and life of many people. Properly matched friction pair, a drum, and a brake pad have a great impact on these factors. The brake pads are far more complex compone MoreThe brake system must be reliable and display unchanging action throughout its use, as it guards the health and life of many people. Properly matched friction pair, a drum, and a brake pad have a great impact on these factors. The brake pads are far more complex components. New technologies make it possible to develop materials with various compositions and different proportions and connect them permanently in fully controllable processes. This elaboration shows that all these factors have a greater or lesser impact on the coefficient of friction, resistance to friction wear and high temperature, and the brake pad’s operating life. The friction materials are required to provide a stable coefficient of friction and a low wear rate at various operating speeds, pressures, temperatures, and environmental conditions. The aim of this work is therefore to investigate the possibility of using a Finite Element Analysis (FEA) approach to evaluate the braking performance of a heavy-duty elevator with different non-conventional pad materials including Composite Carbon fiber reinforced, Composite Epoxy SMC and SiC (silicon carbide). The results show that the performance of SiC (silicon carbide) is better than two other materials. In the braking system with SiC, the required time for stoppage of the system is lower than two other materials. Manuscript profile -
Open Access Article
151 - Optimization of Electromagnetic Railgun and Projectile’s Trajectory by Genetic Algorithm
Navid Moshtaghi Yazdani Mohammad Hasan Olyaei -
Open Access Article
152 - Evaluation of Breast Tumor with Antipodal Vivaldi Antenna
Emine AVŞAR AYDIN -
Open Access Article
153 - Designing Ultra-low-power Cardiac Pacemaker with Quantum Cellular Automation Technology
Mojdeh Mahdavi Mohammad Amin Amiri -
Open Access Article
154 - Comparison of spatial resolution of LandSat and SPOT satellite images in measuring landscape fragmentation
Ehsan Rahimi Abdol-Rasoul Salman Mahini Seyed Hamed Mir Karimi Hamid Reza Kamyab Sattar SoltanianSince the foundation of landscape ecology, the correlation between spatial patterns and ecological processes has always been regarded as one of key topics in this discipline. In this context, landscape metrics provide valuable information for the interpretation of lands MoreSince the foundation of landscape ecology, the correlation between spatial patterns and ecological processes has always been regarded as one of key topics in this discipline. In this context, landscape metrics provide valuable information for the interpretation of landscape patterns. It is clear that the scale of input data and the scale of analysis must be coherent in order to calculate and interpret landscape metrics correctly. One main method that is often used to assess the scaling effects on landscape pattern is to manipulate the grain size or pixel size in satellite images. In this study, The SPOT and LandSat satellite images of 1986 and 2010 and simulations and maps of Markov-cellular automata models of 2020 were used. The effects of spatial resolution on 8 metrics were evaluated using the software FRAGSTATS in class and landscape levels. The results showed that the changes in grain size have significant effects on landscape metrics and their changes in the future so that the increased grain size will lead to the deacreased number of patches (NP), patch density (PD), LSI and CONAG. In general, metrics showed two types of irregular and increase behaviors according to the reduced grain size; in this study, the changes in grain size are more sensitive than the other metrics. So, the application of these metrics in landscape studies shoulde be considerably paid attention. Manuscript profile -
Open Access Article
155 - Simulation of surface runoff using GIS-based model of Limburg soil erosion model (LISEM)
Roya Jafari Vahed Berdi Sheikh Mohsen Hosseinalizadeh Hassan Rezaei MoghadamSimulation of runoff resulted from any significant rainfall events can help to estimate the severity of floods. To protect watersheds, application of a model which is able to predict runoff at certain times and places is essential. Therefore, this study aimed to simulat MoreSimulation of runoff resulted from any significant rainfall events can help to estimate the severity of floods. To protect watersheds, application of a model which is able to predict runoff at certain times and places is essential. Therefore, this study aimed to simulate runoff generation in upstream catchments of the Shahrake Behzisti as well as assessing the effect of implementation of vegetation management scenarios, using three relatively intense rainfall events occurred in recent years. The model of physically based Limburg soil erosion model (LISEM) within PCRaster GIS and programming language was applied in this study. In order to run the LISEM model, four basic raster maps of digital elevation model, landuse, soil texture and roads (impervious areas) were prepared. Digital elevation model map of the catchment was extracted from the Ultracam image of 1 m resolution within the ArcGIS environment. During this study, only two events on 2/11/2014 and 16/9/2015 led to runoff generation. Thus, the first event was used for calibration and the second one for validation of the model. Statistical comparison of the simulated and observed hydrographs of the rain events on 2/11/2014 and 16/9/2015 showed the correlation coefficients of 0.80 and 0.76 and Nash-Sutcliffe criteria of 0.8 and 0.5 respectively. The results of the simulation showed that the model was able to predict total runoff, peak discharge, runoff initiation time and time to peak discharge with relatively good performance. The results of the application of the LISEM model showed that runoff volume and peak discharge significantly decreased by implementation of vegetation management scenarios. Manuscript profile -
Open Access Article
156 - Simulation and Optimization of Dual Gate - Dual Material Tunnel Transistor
Reza Talebzadeh Javad Hasanvand Ali MirIn this paper, we designed and simulated a new TFET. Due to the band-to-band tunneling current mechanism, the TFETs show a low current and subthreshold slope of less than 60mV/dec. As a result, they can be a suitable alternative to MOSFET for use in low-power switching MoreIn this paper, we designed and simulated a new TFET. Due to the band-to-band tunneling current mechanism, the TFETs show a low current and subthreshold slope of less than 60mV/dec. As a result, they can be a suitable alternative to MOSFET for use in low-power switching circuits. But its main disadvantage is its low on-state current compared to MOSFET. In this article, an optimized two-gate-two-material tunnel transistor structure is proposed in which the tunneling rate of carriers increased by adding two regions with inherent impurity compared to the common two-gate TFET structures. We simulated the proposed TFET in two dimensions using Silvaco-Atlas software and analyzed its results. The results are as follows: the on-state current (Ion=5.49×10-6A/µm), off current (Ioff=2×10-18A/µm), Subthreshold slope (SS=15.02mV/dec), and the Ion/Ioff =2.74×1012. The calculated results show the improvement of the DC parameters of the device. Manuscript profile -
Open Access Article
157 - Temperature Effect on Mechanical Properties of Top Neck Mollusk Shells Nano-Composite by Molecular Dynamics Simulations and Nano-Indentation Experiments
A Nouroozi Masir A Darvizeh A Zajkani -
Open Access Article
158 - Chip Formation Process using Finite Element Simulation “Influence of Cutting Speed Variation”
A Kherraf Y Tamerabet M Brioua R Benbouta -
Open Access Article
159 - A Modified Model to Determine Heat Generation in the Friction Stir Welding Process
A Ghiasvand S Hasanifard M Zehsaz -
Open Access Article
160 - Three-Dimensional Simulation of a Steel Plate Deformation as a Result of Underwater Shock Wave using Fluid-Solid Interaction
A Jafari Valdani A AdamianPresent study considered deformation of a solid plate as result of external pressure wave. So, a detailed investigation of underwater explosions (UNDEX) and their effects on solid structures is the main objective of this paper. To accomplish this, numerical methods have MorePresent study considered deformation of a solid plate as result of external pressure wave. So, a detailed investigation of underwater explosions (UNDEX) and their effects on solid structures is the main objective of this paper. To accomplish this, numerical methods have been used to analyze the UNDEX structure qualitatively and quantitatively. Afterward, perpendicular blades are used to reinforce a marine structure. Governing equations in solid and fluid media were discretized using finite element and finite volume schemes, respectively. As for fluid-structure interaction (FSI), two-way coupling methods were used to map the results of fluid and solid media. The numerical method's validity can be confirmed by comparing numerical results with the analytical solution. Pressure-time diagrams follow the analytical solution reasonably well, indicating that the numerical method is valid. Additionally, results indicate that a pressure wave with amplitude of 20 MPa is generated by the detonation of explosive charge under water. Furthermore, reinforcement blades appear to reduce deformation in structures by increasing their resistance to explosive charges. These blades increase the strength of the plate where it could tolerate the Von-Mises stress up to 750 MPa. Manuscript profile -
Open Access Article
161 - Dynamics of a Running Below-Knee Prosthesis Compared to Those of a Normal Subject
A Ebrahimi Mamaghani H Zohoor K Firoozbakhsh R Hosseini -
Open Access Article
162 - Transient Nonlinear Vibration of Randomly Excited Cylindrical Shallow Panels in Non Aging Viscous Medium
A Asnafi -
Open Access Article
163 - Influences of Small-Scale Effect and Boundary Conditions on the Free Vibration of Nano-Plates: A Molecular Dynamics Simulation
S.F Asbaghian Namin R Pilafkan -
Open Access Article
164 - SIMULATION FUNCTIONS AND INTERPOLATIVE CONTRACTIONS
Andreea Fulga -
Open Access Article
165 - An Analysis of the Repeated Financial Earthquakes
Fateme Taleghani Mahdi Salehi Alireza Shakibaiee -
Open Access Article
166 - Stock Option Pricing by Augmented Monte-Carlo Simulation models
Jalal Seifoddini -
Open Access Article
167 - Making Decision on Selection of Optimal Stock Portfolio Employing Meta Heuristic Algorithms for Multi-Objective Functions Subject to Real-Life Constraints
Ali Sepehri Hassan Ghodrati Ghazaani Hossein Jabbari Hossein Panahian -
Open Access Article
168 - Oil Price estimating Under Dynamic Economic Models Using Markov Chain Monte Carlo Simulation Approach
Kianoush Fathi Vajargah Hossein Eslami Mofid Abadi Ebrahim Abbasi -
Open Access Article
169 - New Criterion For Fractal Parameter In Financial Time Series
Mehrzad Alijani bahman banimahd Ahmad Yaghobnezhad -
Open Access Article
170 - Optimization of estimates and comparison of their efficiency under stochastic methods and its application in financial models
Kianoush Fathi vajargah Hamid Mottaghi Golshan Abbas Arjomandfar -
Open Access Article
171 - Deep Learning Application in Rainbow Options Pricing
Ali Bolfake Seyed Nourollah Mousavi Sima Mashayekhi -
Open Access Article
172 - Multivariate geostatistical analysis: an application to ore body evaluation
Mohammad Maleki Nasser MadaniIt is now a common practice in the mining industry to deal with several correlated exploratory attributes, which need to be jointly simulated to reproduce their correlations and assess the multivariate grade risk. Approaches to multivariate simulation, which remove the MoreIt is now a common practice in the mining industry to deal with several correlated exploratory attributes, which need to be jointly simulated to reproduce their correlations and assess the multivariate grade risk. Approaches to multivariate simulation, which remove the correlation between attributes of interest prior to simulation and re-imposing of the relationship afterward, have been gaining popularity over the more common joint simulation methodologies. This is due to their better accuracy and computational efficiency as the number of attributes for simulation increases. Principal component analysis (PCA) is one of these approaches. However, PCA suffers from some drawbacks such as the factors that are uncorrelated just for collocated locations. Minimum/maximum autocorrelation factors (MAF) is a modification of the PCA method where the factors are uncorrelated for two lags. As an expectation, when the linear co-regionalization model contains only two nested structures, the factors do not have any spatial correlations. The main aim of this research is to compare the results of the MAF approach with some traditional approaches for multivariate simulation (co-simulation and independent simulation approaches). To this end, two variables have been simulated with three different methods and are then compared based on some yardsticks such as the ability to reproduce the original correlation coefficient between two variables. The results showed that MAF has the capability to reproduce the intrinsic correlation between the variables. Manuscript profile -
Open Access Article
173 - Ground-motion simulation for the 2017 Mw7.3 Ezgeleh earthquake in Iran by using the Empirical Green's Function Method
Maryam Pourabdollahi Arezou Dorostian Habib Rahimi Attieh Eshaghi -
Open Access Article
174 - SPS Model: a significant algorithm to reduce the time and computer memory required in geostatistical simulations
Behnam Sadeghi -
Open Access Article
175 - Simulation of water-based nanofluids injection into oil reservoirs using the streamline method
Narges Milaninasab Behzad VaferiThe main goal of all reservoir simulators is to predict the flow performance and oil recovery factor. Most commercial simulators solve the equations governing reservoir behavior with the finite difference approach. To solve the three-dimensional equations of flow in a p MoreThe main goal of all reservoir simulators is to predict the flow performance and oil recovery factor. Most commercial simulators solve the equations governing reservoir behavior with the finite difference approach. To solve the three-dimensional equations of flow in a porous media with the finite difference method, the grid dimension has an effect on the simulation results (i.e., divergence). In addition, the simulation of complex reservoirs with a large number of network blocks needs a long computational time. In order to eliminate the effect of block size and increase the speed of simulation, the streamline method has been proposed, which is widely used in the management of hydrocarbon reservoirs. The streamline method can monitor the flow direction in the reservoir, injection efficiency, pore volume, and well allocation coefficient to determine the volume of fluid transferred between injection and production wells. Also, in recent years, many studies have been conducted on the effect of nanofluid injection on the characteristics of oil reservoirs and the increase in oil recovery. Since the streamline method has not been used to simulate the nanofluid injection in oil reservoirs, in this research the effect of water-silica nanofluid injection on the flow equations of phases has been investigated. The simulation results showed that nanofluid injection into the reservoir is more effective than pure water injection and increases oil production. Moreover, it was observed that the reservoir oil type (light and heavy) has an insignificant effect on the simulation results. Manuscript profile -
Open Access Article
176 - Service Process Modeling through Simulation and Scenario Development for Insurance Analysis
Reza Shakerin Abbas Toloie Eshlaghy -
Open Access Article
177 - Modeling Optimal Capital Structure Via System Dynamics Approach
Hamid Abdoli Reza Tehrani Amen Khadivar -
Open Access Article
178 - The Analysis of Mobile Phone Consumers’ Behavior by Combining System Dynamics (SD) and Agent-based Modelling (ABM)
Navid Nadimi Abbas Toloie Eshlaghy -
Open Access Article
179 - Modeling of Overdue Receivables in the City Bank Using Factor-based Simulation (Northwestern Provinces of the Country)
davoud norouzi alireza bafandeh zendeh morteza honarmand azimi -
Open Access Article
180 - Assessment of VSM Scenarios by Simulation of Logistics Systems in Petrochemical Company
Mohsen Parhizgar -
Open Access Article
181 - Energy Consumption in the Traditional Houses based on the Cold and Dry Climate (Case Study: Mashhad's Traditional Houses)
Javid Ahmadi Seyyed Mehdi Maddahi reza mirzaei -
Open Access Article
182 - Molecular dynamics simulation study on the drug discovery in covid-19 disease
Pejman Shir Ali Poor Elham Tazikeh-Lemeski -
Open Access Article
183 - پیشبینی اثر تغییر اقلیم بر رواناب ماهانه حوضهی دز با استفاده از مدل IHACRES
ثریا صیاحی علی شهبازی خیراله خادمیشناسایی و ارزیابی تغییرات جریان ناشی از تغییر اقلیم یکی از مهمترین فاکتورهای برنامه ریزی مدیریت منابع آب می باشد و این مسئله خصوصا در مناطقی که جمعیت زیادی از آن به کشاورزی مشغول هستند، اهمیت دوچندان می یابد. حوضه آبریز دز به عنوان یک قطب کشاورزی در کشور از Moreشناسایی و ارزیابی تغییرات جریان ناشی از تغییر اقلیم یکی از مهمترین فاکتورهای برنامه ریزی مدیریت منابع آب می باشد و این مسئله خصوصا در مناطقی که جمعیت زیادی از آن به کشاورزی مشغول هستند، اهمیت دوچندان می یابد. حوضه آبریز دز به عنوان یک قطب کشاورزی در کشور از جمله مناطقی است که تغییرات آبدهی ناشی از پدیده تغییر اقلیم می تواند جمعیت زیادی را تحت تاثیر قرار دهد. در این تحقیق، ابتدا با استفاده از داده های شبکه ای بارش APHRODITE و مجموعه داده های شبکه ای دمای CHCN-CAMS، مدل هیدرولوژیکی IHACRES برای حوضه مورد نظر واسنجی شد. سپس با معرفی دما و بارش سناریوی 6/2 گزارش پنجم (CMIP5) به مدل هیدرولوژیکی مذکور، تغییرات آبدهی حوضه آبریز در دوره های آتی شبیه سازی می شود. نتایج نشان از افزایش 17/0 تا 2 درجه ای دما و تغییرات 3 تا 75 درصدی بارندگی در دوره 2011-2035 نسبت به دوره مشاهداتی 1983-2007 دارد. نتایج شبیه سازی رواناب برای دوره آتی حاکی از افزایش 7/9 درصدی متوسط رواناب سالانه درازمدت رواناب نسبت به دوره مشاهداتی می باشد. Manuscript profile -
Open Access Article
184 - شبیه سازی کمی و کیفی جریانهای ورودی و خروجی به مخازن تالاب در راستای احیای تالاب هورالعظیم
کاظم حمادی سمانه عبدویستالاب هورالعظیم، تالابی بزرگ و دائمی است که بین دو کشور ایران و عراق قرار گرفته است. با ورود جریان به تالاب شکل هندسی تالاب به صورت یک مخروط ناقص وارونه عمل می کند بدین صورت که با ورود جریان ارتفاع سطح آب تالاب همزمان با گسترش سطح صورت می گیرد. در این پژوهش با بکارگیری Moreتالاب هورالعظیم، تالابی بزرگ و دائمی است که بین دو کشور ایران و عراق قرار گرفته است. با ورود جریان به تالاب شکل هندسی تالاب به صورت یک مخروط ناقص وارونه عمل می کند بدین صورت که با ورود جریان ارتفاع سطح آب تالاب همزمان با گسترش سطح صورت می گیرد. در این پژوهش با بکارگیری روابط هندسی مخروط ناقص نسبت به شبیه سازی هندسی مخازن پنجگانه و برآورد دبی مورد نیاز جهت پر شدن هر مخزن در ترازهای مختلف تالاب اقدام شد. نتایج نشان داد جهت پر شدن مخازن 1 و 2 در طول یک سال آبی نیاز به دبی سالانه 72 متر مکعب در ثانیه و مخزن 3 نیاز به دبی حدود 18 متر مکعب در ثانیه به ترتیب معادل 662 و 579 میلیون متر مکعب در سال دارند. به منظور خیس ماندن تمام یا بخشی از دو مخزن 4 و 5 ظرفیت ایمنی حدود 6/1 میلیارد متر مکعب در سال معادل دبی سالانه 53 مترمکعب در ثانیه لازم است که تلفیقی از آب رودخانه و آب زهکشی است. همچنین با این اختلاط 50 درصدی، هدایت الکتریکی آب این دو مخزن در حدود 5500 میکروموس بر سانتیمتر کنترل خواهد شد. ارقام ذکر شده برای تالاب در حالت پر و شرایط عالی است اما با توجه به محدودیت های منابع آب پیشنهادات دیگری برای حالت پر و خالی شدن مخازن در مقاله ارایه شده است. Manuscript profile -
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185 - مدلسازی هیدروگراف جریان با استفاده از GIS و مدل هیدرولوژیکی توزیعی در حوزه دینور کرخه
مریم آذین‏ مهر عبدالرضا بهره‏ مند آتنا کبیردر این مقاله اساس مدل‏ سازی در حوزه بصورت تقسیم‏‏ بندی آن بصورت شبکه‏ ای می ‏باشد، به ­طوری که هر سلول یک تابع پاسخ مستقل و منحصر به­ فردی نسبت به سایر سلول‏ ها دارد. از مجموع پاسخ‏ های جریان سلول‏ ها، هیدروگراف جریان از سطح حوزه Moreدر این مقاله اساس مدل‏ سازی در حوزه بصورت تقسیم‏‏ بندی آن بصورت شبکه‏ ای می ‏باشد، به ­طوری که هر سلول یک تابع پاسخ مستقل و منحصر به­ فردی نسبت به سایر سلول‏ ها دارد. از مجموع پاسخ‏ های جریان سلول‏ ها، هیدروگراف جریان از سطح حوزه حاصل می ‏شود. روش ارائه شده، پیش ‏بینی هیدروگراف جریان حوزه رودخانه با استفاده از مدل هیدرولوژیکی WetSpa است. WetSpa یک مدل هیدرولوژیکی- توزیعی بر پایه GIS می‏باشد که در مقیاس حوزه عمل کرده و برای پیش‏ بینی سیلاب و مدیریت حوزه آبخیز توسعه یافته است. مدل فیزیکی بوده و قادراست فرایندهای هیدرولوژیکی بارش، ذوب برف، ذخیره برگابی، ذخیره چالابی، رواناب سطحی، نفوذپذیری، تبخیر و تعرق، نفوذ عمقی، جریان زیر سطحی، جریان آب زیر زمینی و... را به طور پیوسته در زمان و مکان شبیه ‏سازی نموده و تعادل آب و انرژی را در هر سلول رستری برقرار نماید. مدل از لایه های توپوگرافی، کاربری و خاک و همچنین آمار هواشناسی روزانه برای پیش‏ بینی هیدروگراف ‏های سیل و توزیع مکانی پارامترهای هیدرولوژیکی حوزه استفاده می ‏نماید. نقشه‏ های رقومی توپوگرافی، کاربری اراضی و بافت خاک سه نقشه اصلی مدل بوده که در قالب GIS و با ابعاد سلولی100 ×100 متر به مدل وارد شدند. مدل با 76 ماه آمار هیدرومتئورولوژیکی اندازه‏گیری شده در حوزه دینور کرخه در کرمانشاه به کار برده شد. نتایج شبیه‏ سازی حاکی از تطابق خوب بین هیدروگراف ‏های شبیه‏ سازی و مشاهده‏ای است به طوریکه مدل قادر است هیدروگراف ‏های روزانه را با دقت خوب و بر اساس معیار ناش-ساتکلیف دوره واسنجی و کلینگ- گوپتا دوره اعتبارسنجی به ترتیب 66 درصد و 72 درصد پیش ‏بینی نماید. Manuscript profile -
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186 - شبیه سازی بهره برداری از مخزن سد سورک با استفاده از مدل Hec-ResSim
مرضیه اکبری رسول میر عباسی نجف آبادی محمد حسین باقریبا توجه به رشد فزاینده تقاضای آب و تنوع نحوه مصرف آب، شبیه­سازی پارامترهای بهرهبرداری مخازن آبی از کاربردی­ترین و ضروری­ترین اقدامات جهت دست­یابی به مدیریت بهینه سدها است. در این مطالعه، نحوه بهره­برداری از مخزن سد سورک با استفاده از مدل HEC-ResSim Moreبا توجه به رشد فزاینده تقاضای آب و تنوع نحوه مصرف آب، شبیه­سازی پارامترهای بهرهبرداری مخازن آبی از کاربردی­ترین و ضروری­ترین اقدامات جهت دست­یابی به مدیریت بهینه سدها است. در این مطالعه، نحوه بهره­برداری از مخزن سد سورک با استفاده از مدل HEC-ResSim شبیه­سازی گردید. شبیه­سازی با توجه به آبدهی ورودی سال­های آبی 81-1380 تا 91-1390، نیازهای آبی پایین­دست و ویژگی­های فیزیکی و بدنه مخزن انجام گردید. نتایج اولیه نشان داد که مخزن سد در اکثر مواقع قادر به تأمین نیازهای پایین­دست (کشاورزی و زیست­محیطی) نمی­باشد. در نتیجه جهت بررسی عملکرد سد در شرایط مختلف سه سناریو ارائه شد. در این سناریوها تأمین کامل نیاز زیست­محیطی و تأمین درصدی از نیاز کشاورزی با در نظر گرفتن شیوه صحیح آبیاری مورد بررسی قرار گرفت. نتایج حاکی از تأمین نیازهای پایین­دست در برخی از مواقع بود. با تغییر الگوی کشت و افزایش راندمان آبیاری می­توان بهترین بهره­وری را از آب موجود در این منطقه داشت. Manuscript profile -
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187 - بررسی آبشکن بر الگوی جریان و تثبیت ساحل در رودخانه کارون با استفاده از نرم افزار CCHE2D
بابک نیک خوی امین بردباراز جمله روشهای متداول کنترل فرسایش کناری رودخانهها، استفاده از آبشکنهای نفوذناپذیر میباشد که در صورت طراحی و اجرای صحیح، علاوه بر کنترل فرسایش کناری، منجر به بازیابی و احیای اراضی با ارزش حاشیه رودخانهها میشود. آبشکنها علاوه بر کنترل فرسایش کناری، منجر به بازیابی Moreاز جمله روشهای متداول کنترل فرسایش کناری رودخانهها، استفاده از آبشکنهای نفوذناپذیر میباشد که در صورت طراحی و اجرای صحیح، علاوه بر کنترل فرسایش کناری، منجر به بازیابی و احیای اراضی با ارزش حاشیه رودخانهها میشود. آبشکنها علاوه بر کنترل فرسایش کناری، منجر به بازیابی و احیای اراضی با ارزش حاشیه رودخانه میگردند و در صورت عدم اجرای صحیح و طراحی غلط ممکن است باعث تشدید فرسایش و نابودی خاکهای زراعی شوند. شاید بتوان گفت مهمترین قسمت طراحی آبشکنها، جانمایی آنها میباشد. برای تعیین طول آبشکنها و همچنین فاصلهی آنها تئوری خاصی وجود ندارد. در این تحقیق به شبیهسازی الگوی جریان حول آبشکنهای ساده در رودخانه کارون حد فاصل اهواز تا خرمشهر در محدوده 5 کیلومتری جنوب اهواز پرداخته شد. نصب آبشکن در قوس بیرونی به علت پایین آوردن سرعت، باعث جلوگیری از فرسایش و در نتیجه تثبیت ساحل میشود. با افزایش دبی از 100 تا 2000 مترمکعب بر ثانیه سرعت جریان از17/0 متر بر ثانیه به 1/2 متر بر ثانیه رسید و با نصب آبشکن سرعت جریان از 11/0 متر بر ثانیه به 57/0 متر بر ثانیه رسید. همچنین تنش برشی از 08/0 نیوتن بر متر مربع به 36/9 نیوتن بر متر مربع رسیده و با نصب آبشکن تنش برشی از 03/0 نیوتن بر متر مربع به 72/0 نیوتن بر متر مربع رسید. نتایج کاهش سرعت جریان و تنش برشی با نصب آبشکن بیانگر اندازه محدوده تاثیر آبشکن بر جلوگیری از فرسایش ساحل قوس بیرونی میباشد. Manuscript profile -
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188 - شبیهسازی منابع و مصارف سد مخزنی مهاباد با سیاست تامین حداکثری مصارف با استفاده از نرم افزار HEC-ResSim
میثم اسدی لور علیرضا پرویشی بهره­برداری از مخزن یکی از موضوعات کلیدی در بین مسائل گوناگون منابع آب می­باشد. در ارزیابی طرحهای برنامهریزی منابع آب معمولا به جنبه­های تامین آب برای نیازهای مصرفی و اثرات زیست­محیطی آن مورد توجه میباشد؛ و در این میان اثرات این طرح­ها بر ا More بهره­برداری از مخزن یکی از موضوعات کلیدی در بین مسائل گوناگون منابع آب می­باشد. در ارزیابی طرحهای برنامهریزی منابع آب معمولا به جنبه­های تامین آب برای نیازهای مصرفی و اثرات زیست­محیطی آن مورد توجه میباشد؛ و در این میان اثرات این طرح­ها بر انرژی تولیدی در نیروگاه­ها مورد توجه قرار نمی­گیرد. در این پژوهش سعی شده اثرات تغییر منحنی فرمان سد مهاباد در قالب دو سناریو عملکرد مخزن از زاویه تولید انرژی برقابی در سد (مهاباد) و تامین نیازهای حداکثری پایین دست مورد بررسی قرار گیرد. سناریوهای برنامهریزی شامل سناریو I (حفظ حجم مخزن سد مهاباد در شرایط خشکسالی و ترسالی در رقوم نرمال) و سناریوII (تامین حداکثری نیازهای کشاورزی و تولید برق آبی) می باشد که جهت شبیه سازی به صورت ماهانه وارد مدل Hec-ResSim شد. در این مدل بر اساس اطلاعات دریافتی از شرکت مدیریت منابع آب، مشخصات هندسی مخزن سد مهاباد و اطلااعات مصرفکنندههای پایین دست سد مهاباد و نیاز زیست محیطی رودخانه مهاباد ترسیم و به عنوان ورودی وارد مدل شبیه ساز شد. مدل برای یک دوره 29 ساله از سال 1370 تا 1399 اجرا و نتایج نشان از برتری سناریو II بر سناریو I داشت به طوریکه در شرایط اجرای سناریو II میزان تامین بخش کشاورزی از 7/30 درصد به 3/63 درصد افزایش یافته بود؛ همچنین با اجرای سناریو II میزان تولید انرژی برقآبی از 1/38 مگاوات در ساعت به 3/43 مگاوات در ساعت افزایش داشت. Manuscript profile -
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189 - مدلسازی عددی جریان آزاد در سرریزهای کرامپ گابیونی
محمد توکل صدرآبادی منوچر فتحی مقدم رضا محمدپورسرریزهای گابیونی به دلیل سازگاری با محیط زیست و تأثیر مستقیم بر پارامترهای کیفی رودخانه و از طرفی در دسترس بودن و سادگی اجرا و طراحی، طی سال های اخیر مورد توجه قرار گرفته اند. در این تحقیق پارامتر های هیدرولیکی سرریز گابیونی کرامپ با حالت جریان آزاد شامل ضریب دبی، پروفی Moreسرریزهای گابیونی به دلیل سازگاری با محیط زیست و تأثیر مستقیم بر پارامترهای کیفی رودخانه و از طرفی در دسترس بودن و سادگی اجرا و طراحی، طی سال های اخیر مورد توجه قرار گرفته اند. در این تحقیق پارامتر های هیدرولیکی سرریز گابیونی کرامپ با حالت جریان آزاد شامل ضریب دبی، پروفیل سطح آب و حجم دبی درون‎گذر از محیط متخلخل به صورت عددی با استفاده از مدل سه بعدی Flow 3D بررسی شده اند. در این تحقیق در مجموع 18 مدل مختلف شامل 6 هندسه ی مختلف سرریز با سه تخلخل مختلف مصالح (43، 44 و 46 درصد) مورد بررسی قرار گرفت. نتایج نشان می دهد که افزایش قطر ذرات به افزایش همزمان دبی درون‎گذر، ضریب دبی جریان و در نتیجه افزایش افت منجر می شود. همچنین اینکه افزایش زوایای خارجی بالادست و پایین دست سرریز باعث کاهش ضریب دبی و نیز دبی درون‎گذر خواهد شد. به علاوه اینکه مشخص شد که تاثیر تغییرات شیب پایین دست بر ضریب دبی و شیب بالادست بر دبی درون‎گذر بیشتر است. در انتها با استفاده از رگرسیون غیر خطی چند متغیره روابطی تجربی برای محاسبه ضرایب دبی و دبی درون‎ گذر از این سرریزها ارائه شده است. Manuscript profile -
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190 - کارآیی مدل برنامه ریزی ژنتیک در شبیه سازی فرآیند بارش- رواناب (مطالعه موردی : حوضه آبریز رودخانه خرم آباد)
حمیدرضا باباعلی زهره رامک رضا سپهوندپیش­بینی میزان دبی رودخانه یکی از مسایل مهمِ مهندسی منابع آب است؛ این موضوع از نظر برنامـه­ریـزی، مـدیریت، و سیاست­گذاری منابع آبی در راستای توسعة اقتصادی و زیستمحیطی به­ویژه در کشوری مثل ایران، با منابع آبی محدود اهمیت بسیار زیادی دارد. آگاهیازچگونگیارت Moreپیش­بینی میزان دبی رودخانه یکی از مسایل مهمِ مهندسی منابع آب است؛ این موضوع از نظر برنامـه­ریـزی، مـدیریت، و سیاست­گذاری منابع آبی در راستای توسعة اقتصادی و زیستمحیطی به­ویژه در کشوری مثل ایران، با منابع آبی محدود اهمیت بسیار زیادی دارد. آگاهیازچگونگیارتباطبینبارندگیورواناب حوضه­هایآبریزبخشجدانشدنیمطالعاتطرح­هایآبی می­باشد. فقدانداده­هایکافیبارش-رواناببهدلیلنبود ایستگاه­هایآبسنجیمناسب،اهمیتبه­کارگیری روش­های نامستقیم و الگوریتم­های فراکاوشیرابرایبرآوردمیزانروانابحوضه­های آبریزبیشازپیشنمایانمی­سازد. در این تحقیق از مدل برنامه­ریزی ژنتیک به­منظور شبیه­سازی فرآیند بارش-رواناب حوضه آبریز رودخانه خرم­آباد استفاده شده است و برای معرفیالگوهاوشناساییبهترینالگویحاکمبرماهیت جریان، با استفاده از توابع برازش و انجام فرآیندهای توسعه­ای و تکرار به منظور یافتن تعداد تکرار بهینه، همه داده­های دوره آماری به دو دسته آموزش و آزمایش(52% آموزش و 48% آزمایش) تقسیم شدند و برنامه برای 1000 تکرار اجرا گردید. همچنین جهت ارزیابی روابط حاصله از مدل شبیه­ساز، از شاخص­های جذر میانگین مربعات خطا (RMSE)،میانگین خطای مطلق(MSE) وضریب تعیین (R2) استفاده شده است. بررسی­های انجام شده حاکی از آن است که فرمول استفاده شده شماره 3 بیشترین انطباق را با داده­های مشاهداتی دارد. بنابراین پیشنهاد میشود جهت مطالعات بارش- رواناب این حوضه از فرمول ذکر شده استفاده گردد. نتیجه این تحقیق مدل برنامه­ریزی ژنتیک را یک روش صریح و دقیق برای پیش­بینی جریان رودخانه­ در حوضه آبریز رودخانه خرم­آباد پیشنهاد می­نماید. Manuscript profile -
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191 - Using conceptual modelling in Agent-based simulation for allocating organization jobs to employees
Alireza Moumivand adel azar Abbass Toloie AshlaghiThe present paper introduces a model by investigating studies that have applied Agent-Based Modelling to improve organization system problems. The model is made of two parts (a conceptual model and an Agent-based model) and their interactions. The conceptual model struc MoreThe present paper introduces a model by investigating studies that have applied Agent-Based Modelling to improve organization system problems. The model is made of two parts (a conceptual model and an Agent-based model) and their interactions. The conceptual model structures the simulation by determining input, output, modelling activities, and system boundaries. Then, the computer model based on the validated and verified conceptual model was built. For practical application of the model, employees’ dissatisfaction of OG companies over promotion system was modeled. Regarding the agent based simulation of promotion process, modelling team with multiple perspectives involving managers, employees, and modelers suggest three scenarios to address the problem. The first scenario suggests financial compensation for employees; the second scenario recommends one grade increase in all the company job-grades; and the last scenario is a combination of them. The results of this investigation indicate that by implementing the first, second and third scenarios the overall dissatisfaction of the company will decrease 57, 42, and 78% over 10 years respectively. Finally, the modelling team proposes the last scenario for implementing in company. Manuscript profile -
Open Access Article
192 - Designing Hybrid Simulation Model Using Paradigms of Discrete Event Simulation and System Dynamics in Order to Analyze Insurance Company
Reza Shakerin Abbass Toloie Eshlaghy Reza RadfarAccording to the increasing role of competition among insurance companies in achieving greater market share, insurance companies are forced to seek methods for increasing customer satisfaction and loyalty. The insurance companies pay special attention to the provided se MoreAccording to the increasing role of competition among insurance companies in achieving greater market share, insurance companies are forced to seek methods for increasing customer satisfaction and loyalty. The insurance companies pay special attention to the provided service quality and thus the duration of service delivery plays an important role in customer perception of service quality.This study attempts to design a model for increasing customer satisfaction and its effect on the market of insurance sales by using simulation paradigms. The present study is descriptive in terms of purpose because it tests the relationship between the declared variables during the research in a particular community and in terms of method, a quantitative study based on the mathematical modeling approach with combined simulation paradigms using Anylogic software. The research findings show the designed model is matched with the real world, which means the output data is accurate and valid. After relating the Discrete Event Simulation Model by identifying the interaction points with the System Dynamics Simulation Model, the mixed scenario in increasing sales has been implemented. Considering the Discrete Event Simulation Model and System Dynamics Model are implemented interactively with each other at the beginning of the simulation model, so due to high rate of customer satisfaction, the input rate is raised by the System Dynamics Model and percentage of employee performance is increased. As the number of dissatisfied customers increases over a period of time, the input rate is reduced by the System Dynamics Model until the system is finally balanced. Manuscript profile -
Open Access Article
193 - Dynamic Analysis of Ordering System in the Supply Chain with the Dynamics of Systems Approach
sayyed mohammad reza davoodi Shahab forutan chehrThe supply chain is a dynamic system that includes all activities related to the creation and delivery of a product, from the raw material stage to the final customer. Sapco's supply chain management needs future decisions and the design of new capacities with a compreh MoreThe supply chain is a dynamic system that includes all activities related to the creation and delivery of a product, from the raw material stage to the final customer. Sapco's supply chain management needs future decisions and the design of new capacities with a comprehensive and interconnected approach. One of the management tools based on this approach is the system's dynamic knowledge. This science has the ability to simulate the supply chain, with the help of this simulation, the uncertain outcomes of decisions are revealed. An analysis of the fluctuations in the behavior of customer orders can provide a key role in predicting customer demand, sales, timely delivery, sales staff adjustments, and other factors. In this paper, the dynamic analysis of the order system in the supply chain with the dynamics of the system is examined. In this paper, based on the principles of the dynamics of the system, following the statement of the ordering system problem in the supply chain, the hypotheses that give rise to the problem are explained; then the dynamic model related to the problem of fluctuations in the ordering system of presentation It will be. first, the main variables were identified and their relationships were formulated in the form of Ali rings, then, by designing the main model, in the form of flow accumulation chart, was simulated in the software. After designing and simulating the final model, validation tests and sensitivity analysis were performed on the model that showed the validity of the model. Manuscript profile -
Open Access Article
194 - Development a dynamic model for analyzing and evaluating Startup scenarios in Iran
Farzad Haghighi-Rad Afshin Neshatitartups are the engine of the economy and the development of these businesses has a major impact on economic growth. To transform a startup into a powerful business in the business environment, finding an investor is a vital step that can drive startup companies to grow Moretartups are the engine of the economy and the development of these businesses has a major impact on economic growth. To transform a startup into a powerful business in the business environment, finding an investor is a vital step that can drive startup companies to grow and expand. In this way one of the major challenges of the founders of the emerging business is to attract investors to invest in supporting new ideas. To achieve this, by identifying the key factors affecting the success of emerging businesses based on the results of previous research, and using simulation models, different policies and scenarios can be made before implementing in an environment Laboratory test and scenario where the results of its implementation are justified in terms of investment. In this paper, the generic model of system dynamics presented by Huang and Konk (Xiaojun Huang, Martin Kunc, 2012) is intended as the base model. By defining a new variable, market attractiveness, the model is developed and various scenarios that are followed by the founders of startups have been evaluated. The simulation results indicate that increasing the attractiveness of the market will lead to an increase in potential customers and the process of converting it to actual customers Manuscript profile -
Open Access Article
195 - Designing SAIPA supply chain resilience scenarios to evaluate the production process
Somayeh Shafaghizadeh Sadoullah Ebrahimnejad Mehrzad Navabakhsh Seyed Mojtaba SajadiContemporary supply chains are complex networks of processes that are subject to many disruptions; a resilient supply chain will be able to respond more quickly to changes by creating capabilities. The effect of supply chain network components on each other under condit MoreContemporary supply chains are complex networks of processes that are subject to many disruptions; a resilient supply chain will be able to respond more quickly to changes by creating capabilities. The effect of supply chain network components on each other under conditions of uncertainty contributes to complexity and disruption. The supply chain must be pushed towards a resiliency strategy in order to reduce disruptions and deal with issues that arise from the supply chain. The purpose of this paper is to analyze network processes from supplier to distributor, in proportion to the convergence of processes by a combination of resilience factors in the automotive industry. The design of the proposed scenarios with the combination of effective resilience factors is presented, which is based on the opinion of industry experts and also takes the vulnerable factors and disorders of each level into account. First, the sources of supply chain risks such as disruptions, delays and vulnerabilities are identified and then twenty-four scenarios are designed with a combination of resilience factors of flexibility, visibility, velocity, and visibility. The company''s complex supply chain is simulated based on the system''s past rate and statistical distribution functions, and then the network DEA is used to select the superior scenario. The indicators of each scenario or simulation output are selected based on the DEA, ranking the most efficient scenario. Finally, the relationships between them have been explored using mathematical analysis and the creation of a regression model between the simulation indices and the output of scenarios. Manuscript profile -
Open Access Article
196 - Present an algorithm based on Gert method and Monte Carlo simulation to manage and control The research and development projects (Case study: Model airplane)
Amir Afsar Seyed Jalal ZiaeiGiven the growing importance of project management and control issues and the benefits of choosing the right management method according to the specific type of project, The purpose of this study is to provide an appropriate method for planning and managing research and MoreGiven the growing importance of project management and control issues and the benefits of choosing the right management method according to the specific type of project, The purpose of this study is to provide an appropriate method for planning and managing research and development projects. Uncertainty of activities and time required to complete each project activity, requires the project manager to use techniques appropriate to the specific nature of the project under review. In this paper, by describing the probabilistic project of constructing a model airplane according to the probabilistic conditions, a suitable algorithm based on Gert method and Monte Carlo simulation is presented in such a way that as a result the project manager can analyze the basic components from the output of the algorithm and estimate random variables such as the expected time of project completion and the average cost of completing project activities and extract the desired results to better manage and control the project. In order to provide a better understanding of the proposed algorithm, the results of using the algorithm to plan and manage the model aircraft construction project will be reviewed and explained and As a result, the expected time and cost of the project is extracted within a 95% confidence interval. Manuscript profile -
Open Access Article
197 - Designing a Model for Employment Development in Yazd Province by the System Dynamics Approach
Hamed Fallah Tafti Syed Ali Naghavi Mir-Mohammad Asaadi FiruzabadiThe inquiry about labor market evaluation in provinces of the country shows that Yazd is one of the provinces that have been faced with the more increasing unemployment rate in the recent years; as the unemployment rate in this province has increased from 5.2% in 1375 t MoreThe inquiry about labor market evaluation in provinces of the country shows that Yazd is one of the provinces that have been faced with the more increasing unemployment rate in the recent years; as the unemployment rate in this province has increased from 5.2% in 1375 to 9.4% in 1389. In this research, we intend to identify the major effective factors on employment development by designing the Yazd province employment model. We also intend to anticipate the future of the province employment with regard to the reciprocal relations of the factors and with attention to various environmental and demographic circumstances. The implementation of this model offers several scenarios in employment development on the basis of system dynamics principles; that can help the major decision makers choose the appropriate policies. The mentioned model is designed on the basis of system dynamics methods. For this reason, the Yazd province employment development was simulated by “Vensim PLE” software concerning the public and private sectors. A period of 30 years from 1385 to 1415 was selected for implementation and test validity of the model. In the end, after explaining the conceived situation for the future of the province employment, with presenting results of the model, a number of suggestions will be given to help choose the appropriate policies in taking future opportunities and increasing the management power against future threats. Manuscript profile -
Open Access Article
198 - Developing an Optimization Algorithm for Multi-product and Multi-level Inventory Systems with Random Parameters
Fariborz Jolai Sayyed Mohammad Reza Davoodi Ali Mohaghar Mohammad Reza MehreganThe present study aimed to develop and compare a simulated model of multi-product and multi-level inventory systems. The model is developed for the final product, different medium products, and the main product. The main purpose of optimization is to minimize costs func MoreThe present study aimed to develop and compare a simulated model of multi-product and multi-level inventory systems. The model is developed for the final product, different medium products, and the main product. The main purpose of optimization is to minimize costs function. The servicing level of units is measured through backfilling rate that should be more than a minimum level. In the proposed algorithm, the local optimization was found through the genetic algorithm. Since point estimation of goal function and backfilling rates are done on the simulation in the present study based, the statistical methods were used for investing possibility of solutions. Finally, one example was presented in the three-level network. Because linear localization is an especial form of second-order localization, the difference between goal function and estimated volume was at the minimum level. Undoubtedly, it is expected that the estimated point of this algorithm is better than the estimated point of linear localization. Manuscript profile -
Open Access Article
199 - Simulating the Impacts of Innovation Investment Policies on Organizational Knowledge Stock Using System Dynamics Approach
Mohammad Mirkazemi Mood Ali MohagharKnowledge is always recognized as an important factor in innovation. However, the needed knowledge for innovation is not always available to organizations readily and it requires that the organization generates a major part of the knowledge. Such knowledge creation can MoreKnowledge is always recognized as an important factor in innovation. However, the needed knowledge for innovation is not always available to organizations readily and it requires that the organization generates a major part of the knowledge. Such knowledge creation can happen through investing in innovation and developing new products. This study aims at investigating the complicated and dynamic nature of the relationship between knowledge creation and investment decision on innovation. Therefore, present paper uses a systematic view and system dynamics approach, as well as its tools such as casual diagrams, the flow diagram, and simulation. The tools are used to study the impacts of different investing policies on organizational knowledge stock. A case study is provided to test the applicability of represented model in the real world. The findings show that the most appropriate policy is allocating resource based on the gap between real knowledge stock and goal knowledge stock. Manuscript profile -
Open Access Article
200 - A New Approach for Solving Multi-layered Facility Location Models under Uncertainty Using fuzzy Simulation
Mahdi Yousefi Nejad Attari Saeed Kolahi-Randji Ensiyeh Neyshabouri JamiDifferent systems have complex behaviors associated with the uncertainty of an important loss issue. Integration of discrete event systems in order to incorporate the uncertainty presented with the theory of fuzzy collections. Multi-layer facility location models have c MoreDifferent systems have complex behaviors associated with the uncertainty of an important loss issue. Integration of discrete event systems in order to incorporate the uncertainty presented with the theory of fuzzy collections. Multi-layer facility location models have complex behavior. In this model, customers receive different services in different layers addressing. The study seeks to provide a facility location models with multiple layers of serving and taking into account the density of the system. The proposed model is for a fuzzy nine linear programming model and it is placed in the field of highly complex issues. In order to solve the mathematical model, fuzzy simulation approaches have been used. In this regard, the applicant is to facilitate functions such as minimizing the travel and waiting time in the queue is the applicant. It is noted that after the implementation, the basic models and scenarios created and Arena software results of fuzzy been ranked. Manuscript profile -
Open Access Article
201 - Numerical Simulation and the Effect of Rotational Speed on the Performance and Thickness of the Gas Film of Dry Gas Seal of the Centrifugal Compressor
Navid Bozorgan Arash Ostovari Nadia Jalalifar Moosa GhasemiIn this paper, using computational fluid dynamics, the dynamic properties of the flow in the two-way grooves of a centrifugal compressor gas seal are simulated. The computational area consists of a gas film between two fixed and rotating rings and the space inside the g MoreIn this paper, using computational fluid dynamics, the dynamic properties of the flow in the two-way grooves of a centrifugal compressor gas seal are simulated. The computational area consists of a gas film between two fixed and rotating rings and the space inside the grooves. Leak performance is tested at thicknesses of 3.08 and 5.08 μm. In order to perform the numerical solution, the continuity and Navier-Stokes equations are solved assuming complete gas using disorganized cells. The flow regime is considered layered. The results obtained include the pressure distribution. The results of numerical solution of the geometric model with bidirectional C-shaped groove were evaluated with Gabriel experimental results. Geometry discussed in this dissertation is the geometry of dry gas compressor C-14200 alkylation unit of Abadan Oil Company. The results show that the rotation speed of the Dry Gas Seal, or DGS for short, has a significant effect on the hydrodynamic effect, while the pressure of the outer radius and the thickness of the gas film both reduce the hydrodynamic effect. Manuscript profile -
Open Access Article
202 - Simulation of the autonomous robot control system in different geometric conditions of the pipe and the effect of the optimal torque distributor on the energy consumption of the robot
Hosain Mashjoor Koresh Heidari Shirazi In the present research, an autonomous wheeled seven-degree-of-freedom robot with an adaptation mechanism to a passive diameter pipe was designed with the help of Adams software, and after checking the correctness of its movement, by designing a More In the present research, an autonomous wheeled seven-degree-of-freedom robot with an adaptation mechanism to a passive diameter pipe was designed with the help of Adams software, and after checking the correctness of its movement, by designing a fuzzy controller in the Simulink section of the software, the dynamic simulation of its movement in various geometric conditions such as straight and vertical pipes, elbows, pipes with reducers, deposits and corrosion were investigated. A fuzzy controller was designed to guide this robot inside the tube, and its control system was implemented using direct current motors for each of the robot's wheels. The ability of the fuzzy controller of the robot to follow the desired input speed and its response characteristics in the steady state were investigated, and the presented results showed that the fuzzy controller performs better in following high speeds and has a better transient response at these speeds. Using the optimal torque distribution system, the robot control system is improved and the output signal of the fuzzy controller can be sent to the robot wheels in a targeted way. Therefore, the application of this method caused a significant reduction in the power consumption of the robot and optimization of its energy consumption. This designed robot has a high potential for making an accurate sample, commercialization and responding to the current needs of the country's oil and gas industry due to its less expensive mechanism compared to similar ones. Manuscript profile -
Open Access Article
203 - Toward Process Innovation By Using Simulation Technique
Gh. Bodaghi J. Mahmudi Innovation indicates the creative thought that means the introduction of new product, process and service to the market. Innovation means the use of mental capabilities in order to form a new concept or idea. Companies need innovation for long-term survival in to More Innovation indicates the creative thought that means the introduction of new product, process and service to the market. Innovation means the use of mental capabilities in order to form a new concept or idea. Companies need innovation for long-term survival in today's competitive world; otherwise, they easily will be removed from the competitive scene.Although innovation may has numerous advantages to the organization by decreasing the costs or improving the efficiency, there are main risks which computer simulation can decrease them and increase the success of chance of their implementation. In this paper we review the literature and definitions of innovation and its different types, especially process of innovation. Then, we consider the simulation and its definitions, advantages and disadvantages, and also the importance of using simulation toward the process innovation. Therefore, toward the process innovation, a comprehensive compound methodology basis of twenty four simulation methodologies and approaches is presented. Finally, the results of a project performed at the Iranian high council of informatics are mentioned by the use of this methodology and SIMPROCESS simulation software. Manuscript profile -
Open Access Article
204 - Coal exploratory pattern estimation by geological uncertainty and analysis of fault presence effect (Parvadeh III region)
Omid Asghari Naser Madani-EsfahaniGeostatistical simulation methods have known as a powerful tool for estimating spatial distribution of geologicaluncertainty and risk in the mining exploration. This method is used in metal mining industry very much but wasless in coal mining industry. Parvadeh III is l MoreGeostatistical simulation methods have known as a powerful tool for estimating spatial distribution of geologicaluncertainty and risk in the mining exploration. This method is used in metal mining industry very much but wasless in coal mining industry. Parvadeh III is located in east of central Iran. This deposit has 5 layers as: C1, C2,B1, B2, and D, that layer C1 was chosen as a layer which can reflect alone the specification of Parvadeh IIIbecause of low ash, lack of continuity of the coefficient of zero and first place in terms of having quality. In thisresearch, at first Sequential Gaussian Simulation (SGS) has applied in order to carbon accumulation and faultestimation. Then accumulation geological uncertainty for coal resource classification has obtained using errormaps. More optimal number of boreholes in the area, according to the 95% confidence level has determined.Since the uncertainty and risk have significant role in geological fault coal resource estimation and previousstudies estimated mineral resources and reserves of coal has also been ignored, according to these criteria thepresence of fault probability maps were determined. The places that have probability of fault presence about100% are the riskiest regions for coal resource estimation. Finally, this method can be used for subsequentanalysis to design exploratory pattern because of the high performance. Manuscript profile -
Open Access Article
205 - Optimizing the conjunctive use of Surface and underground water resources and its impact on the environment (Case Study of the central city of Gorgan
MAHMOOD ZAKERINIRI SEYIDERFAN HOSSINI SEYIDEMAD HOSSINI ATA OLLAH NAJAFI JEILANIAn integrative operating system consists of a surface water subsystem and groundwater subsystem. To satisfy water demands, these subsystems interact with each other. They will act as two parallel tanks that they can use each other's storage volume through sending the op MoreAn integrative operating system consists of a surface water subsystem and groundwater subsystem. To satisfy water demands, these subsystems interact with each other. They will act as two parallel tanks that they can use each other's storage volume through sending the operating commands. This paper presents a simulation-optimization model for designing dimensions as a mass form whose components include periodic series.For more accurate results, water status relating to two years with eight seasons, in the first year, the amount of water was more than the second year, have also been studied. In this method, simulation method is placed in optimized model so that it forms a simulation-optimization model. The results, which were based nonliner programming, revealed that release from the dam reservoir will not necessarily be similar to non-consolidated model. Also based on the other results, we can refer to the optimized design of model components such as dams and wells and optimal usage command. Manuscript profile -
Open Access Article
206 - Assessment of Adaptive neural fuzzy inference systems and support vector regression in runoff estimation(A case study:Dez Basin)
Ghazaleh Ahmadian Ahmadabad Mahmoud Zakeri Niri Saber Moazami GoudarziEstimation of discharge flow in basin due to impact on water resource management can have an important economic role.In this research several computationals intelligence techniques suchas:ANN,SVR and ANFIS have been used to prediction the runoff dez basin.correlation be MoreEstimation of discharge flow in basin due to impact on water resource management can have an important economic role.In this research several computationals intelligence techniques suchas:ANN,SVR and ANFIS have been used to prediction the runoff dez basin.correlation between stations was investigated and stations of kamandan,zoorabad and daretakht were eliminated due to small correlation with around stations.then due to lack of human intervention with using xlstat software were evaluated trend of stations and were selected stations without trend.Inorder to evaluate the performance of models were used correlation,RMSE and NSE.Results of this research showed that ANFISwith clustering approach gives better estimation than grid partitioning approach.ANN, ANFIS and SVR have agood ability to simulate the flow of dez basin. Manuscript profile -
Open Access Article
207 - Exploring the possibility ofaccurately model in wettability alteration mechanism for LSW process via Eclipse simulator
Mohsen Najafi Seyed Jamal Sheykh Zakariyaee Naser Akhlaghi OlghiIn this paper, the proper modeling of the wettability modification mechanism in the process of water injection with low salinity was investigated using the eclyps simulator. Most reservoirs are in their late stages of production, and still a high percentage of oil is av MoreIn this paper, the proper modeling of the wettability modification mechanism in the process of water injection with low salinity was investigated using the eclyps simulator. Most reservoirs are in their late stages of production, and still a high percentage of oil is available in reservoirs; hence the need to find a way to increase oil production from these reservoirs is more and more felt. Hence, the methods of harvesting should be used. One of the ways of treating withdrawal can be low intake of water with salinity. In this project, the method of water injection with low salinity is investigated with the aim of increasing the recycling of oil. To achieve this goal, the Ellips simulator is used. The heavy oil fluid model is modeled for oil reservoir; then water injection is simulated with different salinity (low salinity). Salines are considered to be high salinity with a concentration of 45000 PPM and low salinity, with concentrations of 24000 PPM, 8000, respectively. Water injection with different salinity increases the recovery rate of oil. The results show that water injection with salinity of PPM is 8000, with an oil recovery rate of 38% to 50%. Manuscript profile -
Open Access Article
208 - Velocity Estimation of Moving Target by GB-SAR Sensor Using MIMO Antennas
Negar Zahedi Jalal Amini Many researchers and users have drawn their attention to the radars with Multiple Input-Multiple Output (MIMO) antennas in recent years. The reason is the capabilities that these systems provide to the users, including its low cost, the similarity of the output of More Many researchers and users have drawn their attention to the radars with Multiple Input-Multiple Output (MIMO) antennas in recent years. The reason is the capabilities that these systems provide to the users, including its low cost, the similarity of the output of MIMO antenna arrays compared to conventional systems with similar characteristics, and its strength. One of the applications of this system in Radar Remote Sensing is identifying the objects and their movement speed. This article’s primary purpose is to identify the moving object and determine its speed by Doppler processing and Fourier transform. For this purpose, firstly general topics related to MIMO systems are mentioned, and then available explanations on how to identify the moving objects are provided. Finally, the characteristics of the sensor used in the laboratory and the results of two different simulations in a software environment are presented. The first simulation is to determine the proper angle of transmission of waves to the object, and the second simulation is to identify two moving objects in two different modes: 1- moving two objects at different speeds while the sensor is stationary and 2- simultaneous movement of two objects and also moving the sensor at different speeds. Manuscript profile -
Open Access Article
209 - Simulation of snowmelt runoff by (SRM) hydrological model Using MODIS Satellite Imagery
Ehsan FouladvandPrediction and estimation of runoff from snowfall and a quantitative understanding of its various production processes is considered as one of the important topics in hydrology. Therefore, the quantitative and qualitative achievement of it with a systemic approach in th MorePrediction and estimation of runoff from snowfall and a quantitative understanding of its various production processes is considered as one of the important topics in hydrology. Therefore, the quantitative and qualitative achievement of it with a systemic approach in this regard is of importance since it forms the basis of studies of construction projects in various fields of development and exploitation in water resources and hydraulic structures and other environmental areas in the watersheds. Regarding the fact that snow cover represents the amount of stored water, so spatial-temporal (spatiotemporal) monitoring of snowmelt runoff is of great importance in hydrological forecasting in this region.The determination of the amount of snowmelt runoff is a function of regional characteristics and the availability of regional data. Therefore, in order to achieve this, ground operation and the creation of a denser network of snow survey stations are needed, which is almost impossible and is not economical. Therefore, in this study, in order to simulate runoff and estimate the share of snowmelt runoff in Marboreh River, simultaneously, optical satellite data and hydrological modelling of runoff are used as advantages. So that, snow product of the 8-day MODIS at 500-meter resolution was used to calculate the snow cover. Finally, the results obtained from runoff simulation by the coefficient of determination and subtracting volume, which were obtained at 0.93 and 3.48 respectively, indicate the high accuracy of the simulation for the area under study. Manuscript profile -
Open Access Article
210 - The Effect of Number of Steps on the Performance of a Cascade Type Solar Still
Nader Rahbar فاطمه علی پناهThe purpose of this study is to simulate fluid flow in a weir-type cascade solar still, assuming steady-state and air being the ideal gas and incompressible. The commercial software FLUENT is used for numerical simulation of the process. SIMPLE algorithm is used to calc MoreThe purpose of this study is to simulate fluid flow in a weir-type cascade solar still, assuming steady-state and air being the ideal gas and incompressible. The commercial software FLUENT is used for numerical simulation of the process. SIMPLE algorithm is used to calculate the relationship between pressure and velocity. In addition, first order upwind method is applied for separation of displacement and interpolation of pressure. Numerical simulations are performed for Solar Still with four to ten and also with twelve steps. Results of investigations on a Solar Still with different number of steps, in which the height of the steps is constant value of 2 cm, show that increasing the number of steps causes to increase water production up to eight steps. Furthermore, the highest rate of water production was 232 ml/m3hr for solar still with eight steps. Manuscript profile -
Open Access Article
211 - The Effect of Partially Cooling on the Productivity of a Tubular Solar Still – A Numerical Study
Ehsan Fotouhi Bafghi Nader RahbarToday, Solar stills have become a popular water purification facilities in desalination research areas. They use solar energy as a never ending, low cost and clean energy. They have no moving parts and without any noise. In this study, we investigate the effect of parti MoreToday, Solar stills have become a popular water purification facilities in desalination research areas. They use solar energy as a never ending, low cost and clean energy. They have no moving parts and without any noise. In this study, we investigate the effect of partially cooling on the productivity of a tubular solar still. For this purpose, 2-D finite volume method was used to solve velocity, momentum, energy and mass transfer equations for humid air inside the enclosure. Moreover, the effect of using glass-cover partially-cooling on the stream lines, isotherms, mass fraction and water productivity was investigated. The results showed that numerical simulation has a good agreement with experimental results. Furthermore, we concluded that increasing the Rayleigh number and using partially cooling lead to enhance water productivity. Moreover, the maximum productivity was achieved in Ra=105 when using partially cooling on top of the glass cover. Manuscript profile -
Open Access Article
212 - Investigation the effect of diameter and temperature on mechanical properties of single-walled boron nitride nanotubes by molecular dynamics simulation
Mohammad reza Mostafaei Abdolhosein Fereidoon Masoud Darvish ganjiThe molecular dynamics (MD) simulation is used to calculate the mechanical properties of single-walled BNNTs (SWBNNT). The effects of diameter, chirality and temperature on the mechanical properties of respected systems have been investigated. The results showed that, z MoreThe molecular dynamics (MD) simulation is used to calculate the mechanical properties of single-walled BNNTs (SWBNNT). The effects of diameter, chirality and temperature on the mechanical properties of respected systems have been investigated. The results showed that, zigzag BNNTs are stiffer than armchair ones with nearly the same diameter. Also the Young’s modulus of both type of SWBNNTs increase when the tube diameter increases till the specific diameter and then decrease slightly. We found that diameter changes have no significant influence on the failure stress and strain of zigzag BNNTs. In addition, the results confirmed that all measured mechanical properties decrease with increasing temperature. Our simulation findings afford not only a molecular level understanding of the BNNTs but also may be instructive to mechanical engineers and scientists who attempt to develop effective mechanical properties. Manuscript profile -
Open Access Article
213 - Numerical simulation and experimental study on a microscale vortex tube
نادر رهبر Mostafa Shateri Mohsan Taherian محمد صادق ولی پورIn This paper the energy separation phenomenon in a micro-scale vortex tube was investigated by using the computational fluid dynamic. The flow is assumed as steady, turbulent, compressible ideal gas, and the shear-stress transport is used for modeling of turbulence phe MoreIn This paper the energy separation phenomenon in a micro-scale vortex tube was investigated by using the computational fluid dynamic. The flow is assumed as steady, turbulent, compressible ideal gas, and the shear-stress transport is used for modeling of turbulence phenomenon. The results show that 3-D CFD simulation is more accurate than 2-D axisymmetric one. Moreover, optimum cold-mass ratios to maximize the refrigeration-power and isentropic-efficiency are evaluated. The results of static temperature, velocity magnitude and pressure distributions show that the temperature-separation in the micro-scale vortex tube is a function of kinetic-energy variation and air-expansion in the radial direction. Manuscript profile -
Open Access Article
214 - Atomistic simulations on the influence of diameter, number of walls, interlayer distance and temperature on the mechanical properties of MWBNNTs
mohammad reza mostafaei Abdolhosein Fereidoon Masoud Darvish ganjiBy using molecular dynamics (MD) simulation the mechanical properties of single, double and triple walled BNNTs (SWBNNT, DWBNNT and TWBNNT) is investigated. The effects of diameter, chirality, interlayer distance and temperature on the mechanical properties of respected MoreBy using molecular dynamics (MD) simulation the mechanical properties of single, double and triple walled BNNTs (SWBNNT, DWBNNT and TWBNNT) is investigated. The effects of diameter, chirality, interlayer distance and temperature on the mechanical properties of respected systems have been investigated. The results showed that, zigzag BNNTs are stiffer than armchair ones with nearly the same diameter. Also, the Young’s modulus of both type of DWBNNTs and TWBNNT increase when the tube diameter increases. In addition, the results confirmed that all measured mechanical properties decrease with increasing temperature. Furthermore, the Young’s modulus of DWBNNTs are smaller than TWBNNTs and larger than SWBNNT. We showed that the Young’s modulus of DWCNTs with various interlayer distances increase when separation wall distances were decreased. Our simulation findings afford not only a molecular level understanding of the BNNTs but also may be instructive to mechanical engineers and scientists who attempt to develop effective mechanical properties. Manuscript profile -
Open Access Article
215 - Numerical Study on the Effect of dimension of Steps on the Performance of a Cascade Solar Still
Nader Rahbar فاطمه علی پناهThe purpose The purpose of this study is to simulate fluid flow in a weir-type cascade solar still, assuming steady-state and air being the ideal gas and incompressible. The commercial software FLUENT is used for numerical simulation of the process. SIMPLE algorithm is MoreThe purpose The purpose of this study is to simulate fluid flow in a weir-type cascade solar still, assuming steady-state and air being the ideal gas and incompressible. The commercial software FLUENT is used for numerical simulation of the process. SIMPLE algorithm is used to calculate the relationship between pressure and velocity. In addition, first order upwind method is applied for separation of displacement and interpolation of pressure. The effective parameters on unit productivity are the distance between glass surface and water, height of solar still, the number of vortexes and convective heat transfer coefficient. Results of investigations on a Solar Still with different height of steps, indicated that the productivity increases with increasing the height of stairs. Although, it should be noted that in each model with specific number of stairs there is an upward-downward trend; in other words, there is an optimum point in each model with specific number of stairs. Also, the still in the specific model of six-stairs with the height of 3.5 cm of stairs had maximum productivity. Manuscript profile -
Open Access Article
216 - Structural analysis and numerical simulation of composite beam subjected to a harmonic moving load on Pasternak viscoelastic foundation
Mohamad Javad Rezvani Roholah RezaieIn this paper, dynamic response of an infinite Timoshenko beam subjected to a harmonic moving load based on the first order shear deformation theory (FSDT) is studied. The beam made of a symmetric laminated composite that is located on a generalized Pasternak viscoelast MoreIn this paper, dynamic response of an infinite Timoshenko beam subjected to a harmonic moving load based on the first order shear deformation theory (FSDT) is studied. The beam made of a symmetric laminated composite that is located on a generalized Pasternak viscoelastic foundation. It is assumed that the mechanical properties of the beam change in the direction of the beam thickness but remain constant in the axial direction. By selection of an appropriate displacement field for the composite beam, and using the principle of total minimum potential energy, the governing partial differential equations of motion are obtained and solved through a complex infinite Fourier transformation method. In this study, by using numerical simulation, the effects of stiffness, damping and shear layer viscosity coefficient of foundation, velocity and frequency of the moving load over the beam response are studied. Then, the numerical simulation results for deflection, shear force and bending stress are abtained. The results show that, when the normal stiffness, shear layer viscosity coefficient, velocity and frequency of the moving load increases, the deflection, shear force and bending stress of the composite beam decreases. The results obtained from the FSDT are compared with the results of a finite element and good agreement is found. Therefore, the dynamic responses of the composite beam under moving load can be found with high accuracy by using the finite element method. Manuscript profile -
Open Access Article
217 - Molecular dynamic simulation for investigation of temperature, neck length and sheet size influence on mechanical properties of graphene nanobud
marjan khorasani Abdolhosein FereidonCarbon has several allotropes. One of the newest carbon allotrope is graphene nanobud. It isn’t available in laboratory. Graphene nanobud is formed by connecting fullerene and graphene sheet. Molecular dynamic simulation is used for calculating mechanical properti MoreCarbon has several allotropes. One of the newest carbon allotrope is graphene nanobud. It isn’t available in laboratory. Graphene nanobud is formed by connecting fullerene and graphene sheet. Molecular dynamic simulation is used for calculating mechanical properties of graphene nanobuds. Influence of temperature, neck length and size of graphene sheet are estimated in this study. The results shows that Young’s modulus has a little changes with temperature arrises. In another word, with increasing temperature the Young’s modulus doesn’t change very much and just alittle decrease. Also seen that in constant temperature with increasing the size of graphene sheet, the Young’s modulus arises. Our simulation findings afford not only a molecular level understanding of graphene nanobud but also may be instructive to mechanical engineers and scientists who attempt to develop effective mechanical properties. Manuscript profile -
Open Access Article
218 - Thermodynamic analysis and optimization of the power piston Stirling engine beta can be used to increase the output power and efficiency
سید بهمن حسین زاده ساداتی Hadi Kargar Sharifabad نادر رهبرThe purpose of this article is to develop a thermodynamic model appropriate to be piston Stirling engine beta-type deformation is to increase efficiency and output power l. For this purpose, thermodynamic modeling is done in two parts, the first part was isothermal mode MoreThe purpose of this article is to develop a thermodynamic model appropriate to be piston Stirling engine beta-type deformation is to increase efficiency and output power l. For this purpose, thermodynamic modeling is done in two parts, the first part was isothermal modeling and then using the results of numerical modeling to model the geometry of adiabatic method is performed. In fact, the results of the first part (modeling isothermal), as initial values of the second part (modeling adiabatic), is used. Modeling was performed using MATLAB software and by changing the diameter of the piston, the heat input, heat output and engine efficiency. The results obtained were compared with published values, compared. Manuscript profile -
Open Access Article
219 - Numerical Investigation and Optimization of Die Parameters in Parallel Tubular Channel Angular Pressing Process
Amin Armanian Hassan khademi zadehIn this day and age, the ultra-fine materials due to their unique properties have found a special place in various industries. By reducing the grain size, the share of atoms at the grain boundaries has been increased and the increase of grain boundaries prevents the mov MoreIn this day and age, the ultra-fine materials due to their unique properties have found a special place in various industries. By reducing the grain size, the share of atoms at the grain boundaries has been increased and the increase of grain boundaries prevents the movement of dislocations and increases the strength. One method of producing ultra-fine materials is imposing severe plastic deformation. In order to apply Plastic deformation, disparate methods can be used that parallel angled channels are used in this study. ABAQUS finite element software is used to analyze the process numerically and to optimize the results, neural network and genetic algorithm methods have been used. In this study, the effects of die parameters including channel angle, tube length, increase of diameter difference and the friction coefficient are checked out. The results depicted that the coefficient of friction and pipe length which are tested, played a pivotal role in the homogenization of strain distribution separately; that by increasing the supposed friction coefficient and reducing the length of the tube, the strain distribution will be homogeneous. The difference between the increase in the diameter of pipe and the angle of die’s channel will have little impact on the improved uniformity of strain distribution. On the other hand, increasing the coefficient of friction, pipe length and diameter of pipe ends with an increase in the force of process while increasing the angle of die’s channel culminated in reducing the formation force. Additionally, considering the results obtained from optimization of parameters, Manuscript profile -
Open Access Article
220 - Energy simulation of office building with current materials in Semnan climate
afshin fathalian Hadi Kargar SharifabadOne of modern world challenges is saving energy consumption. Multiple increase in energy price on one hand and limitation of fossil fuel as well as its consequent bio environmental pollution on the other hand have shown the necessity of sensible energy application. Mean MoreOne of modern world challenges is saving energy consumption. Multiple increase in energy price on one hand and limitation of fossil fuel as well as its consequent bio environmental pollution on the other hand have shown the necessity of sensible energy application. Meanwhile energy consumption in construction sector is so high that saving even as little as possible in this section will have significant effect on efficiency rate of no renewable sources. Considering multiple relevant parameters in energy consumption with no application of simulating tools cannot permit reasonable decisions on designing building parts. In this research the proportion of annual energy consumption of office building located in Semnan city climate with application of design builder software has been simulated. Accuracy of results from simulation has been validated with recorded numbers at annual electricity and gas bills at the building. Manuscript profile -
Open Access Article
221 - Investigating the effect of flash gutter geometry on material flow and defect formation in cold forging of AA 3003 Aluminum alloy
milad Bandad Mehrdad Ozve AminianThe aim of this study, is study on the effects of flash gutter geometry on the material flow, predict of defect formation and forging process parameters in cold forging. For this purpose, effects of three flash geometry with trapezoidal, oval and square shapes were inve MoreThe aim of this study, is study on the effects of flash gutter geometry on the material flow, predict of defect formation and forging process parameters in cold forging. For this purpose, effects of three flash geometry with trapezoidal, oval and square shapes were investigated on the simple frustum part. The effect of flash gutter geometry simulated using ABAQUS finite element software and then form with the optimized flash gutter was manufactured and forging process to verify the simulation results on a piece of AA3003aluminum alloy, was carried out. The results showed that trapezoidal flash gutter had more appropriate conditions for material flow than other cases. According to the simulation results, the maximum plastic strain was formed around the flash area and its value was maximum in the die with trapezoidal flash gutter, which was due to the greater flow of the material in the trapezoidal flash gutter geometry. According to the simulation results prediction, the distribution and exerted applied pressure to produce the final part on die with square flash gutter was more than others. The maximum applied pressure was on the flash area of die, which was the largest for the square flash gutter, and had the smallest amount of trapezoidal flash gutter geometry. Manuscript profile -
Open Access Article
222 - Design and Modeling of Ultrasonic Phased Array Testing and Ultrasonic waves propagation Simulation in Metal Plate by Finite Element Software (ABAQUS)
shahram yareieeUltrasonic Phased Arrays are an emerging technology in nondestructive testing and evaluation. The type of linear phased array probe is a prevailing type in which elements are placed side by side and longitudinally. In this paper ultrasonic phased array testing (UPAT) is MoreUltrasonic Phased Arrays are an emerging technology in nondestructive testing and evaluation. The type of linear phased array probe is a prevailing type in which elements are placed side by side and longitudinally. In this paper ultrasonic phased array testing (UPAT) is introduce and in order to modeling and design UPAT consideration of wave equation solution by Finite Element is proposed. ABAQUS 6.14 is used as finite element software. Wave propagation in two form is simulated, straight and inclined. Direct and sectorial scanning is based on these forms of waves propagation. Time delay is the most important issue that should be considered in UPAT modeling. Results of simulation is verified by comparing previous research in UT field. Finally, results in additional to proposed the obvious view of UPAT, it's so useful for properly design probes and defect detection UPAT devices. Using finite element methods in this field is cost and time effective. Manuscript profile -
Open Access Article
223 - Robust-design-optimization of Flutter velocity of an aeroelastic high-aspect-ratio wing
meysam elyasi ALIREZA ROUDBARIIn this study, with the assumption of uncertainty in system design variables, a robust Optimization of the Flutter velocity aeroelastic wing with high-aspect-ratio under the bending-torsion effect is examined . Therefore, the aerospace wings are firstly modeled based on MoreIn this study, with the assumption of uncertainty in system design variables, a robust Optimization of the Flutter velocity aeroelastic wing with high-aspect-ratio under the bending-torsion effect is examined . Therefore, the aerospace wings are firstly modeled based on the Euler-Bernoulli cantilever beam model in quasi-steady aerodynamic conditions. After validating the results, in the simulation section, by using the Runge-Kutta numerical solution and the theory of Eigenvalues, the system response time and Flutter velocity are obtained. Therefore, by choosing parameters such as bending and torsional rigidity and mass per unit wing as optimization variables the effect of uncertainty on the design variables and optimized by genetic algorithm. In addition, the values of variables before and after optimization, as well as the rate of improvement of the Flutter velocity are presented in a robust and deterministic optimization. Finally, based on the optimization results, design variables for achieving an appropriate stability structure in terms of the phenomenon Flutter is confirmed. Manuscript profile -
Open Access Article
224 - Study of increasing the length of the tube on thermosyphon heat pipe performance
farshid neemati Hadi Kargar SharifabadThe heat pipe as superconductors can play an essential role in heat transfer According to the application, are designed in different sizes The heat pipe for heat transfer with very high thermal conductivity that heat energy by evaporation and condensation of a working f MoreThe heat pipe as superconductors can play an essential role in heat transfer According to the application, are designed in different sizes The heat pipe for heat transfer with very high thermal conductivity that heat energy by evaporation and condensation of a working fluid with minimal temperature drop pass When the heat of evaporation area is the working fluid evaporates and creates a pressure gradient in the tube The steam pressure gradient along the tube makes the move to steam condenser condenses in the condenser is, the latent heat is released. The working fluid of the heat pipe by gravity thermosyphon returns to the evaporation zone In this study the vapor and liquid inside the heat pipe is modeled thermosyphon type It is assumed that the flow is permanent and peaceful two-dimensional and volumetric forces have been ignored. In this paper, the finite volume method and SIMPLE algorithm is used. The geometry of the model with the software Gambit drawing grid and numerical calculations to using a software package Efficient called Ansys Fluent by subsidies carried out and the results with the results of a study comparing the temperature of the wall and the heat pipe in all three areas have been analyzed. Manuscript profile -
Open Access Article
225 - Experimental and Numerical Investigation of Explosive Wave blasting on the Aluminum Plate
shahram yareiee majid GanjiExplosion is fast chemical reaction that alters primary explosive material to gas. Explosion process include two general part of starting explosion and interaction between environment and explosion products. Study of plate performance and investigation elastic – p MoreExplosion is fast chemical reaction that alters primary explosive material to gas. Explosion process include two general part of starting explosion and interaction between environment and explosion products. Study of plate performance and investigation elastic – plastic behavior and plate rupture is essential to determine relation of those with plate geometric parameter. Shock tube is used for modeling and simulation of loading explosion. In this paper, Experimental and FEM modeling are used to Investigation of Explosive Wave blasting on the Aluminum Plate. Simulation is done by ANSIS Autodyn software. Shock tube was designed and fabricated in order to experimental study. Manuscript profile -
Open Access Article
226 - Investigation on the effect of the honeycomb core orientation to lateral plates on the energy absorption capacity of the sandwich panel used in the elevator hole
amir ghiasvand hossein ahmadi rashid soran hasanifardSandwich panels are used due to the ability of the core to absorb energy efficiently to Damped the kinetic energy from collision and exposure to the explosive wave. In the present study, the effect of the orientation of the core of honeycomb sandwich panel to the latera MoreSandwich panels are used due to the ability of the core to absorb energy efficiently to Damped the kinetic energy from collision and exposure to the explosive wave. In the present study, the effect of the orientation of the core of honeycomb sandwich panel to the lateral plates and the loading direction on the absorption and dissipation of energy due to the cabin lift with a sandwich panel embedded in the elevator hole has been investigated. Six angles of 0, 5, 10, 20, 30 and 45 degrees were used for this purpose. It was observed that by increasing the angle of orientation of the panel core, the stiffness of the panel will fall, and this decrease will occur with a greater increase in the angle of the more orientation of the core strongly. By increasing the amount of honeycomb core angle from the optimal limit, the structure will experience compression and due to large plastic strains, which causes the stiffness of the panel to rise and the panel acts as a rigid body due to its incompressibility and its energy depreciation is severely reduced. Manuscript profile -
Open Access Article
227 - The Effect of Polyurethane Mandrels and NBR in the Bending Process of Steel Pipe with using the Numerical Simulation and Experimental Test
Seyed Ali Poursayed Rezaee majid jabbariToday, the bent tubes of various bending radius are widely used in the automobile, aerospace, and shipbuilding industries. In the tubes bending, the smaller the bending radius and wall thickness of the tube, the greater the likelihood of defects such as wrinkle, rupture MoreToday, the bent tubes of various bending radius are widely used in the automobile, aerospace, and shipbuilding industries. In the tubes bending, the smaller the bending radius and wall thickness of the tube, the greater the likelihood of defects such as wrinkle, rupture and non-circularity of the cross-section of the tube. Therefore, one of the most important issues is how to fix these defects. For the reduction of wrinkle and rupture, the effect of geometric parameters of bending tools, mold and mandrels in pipes are been considerate. The type of mandrel used in the bending process can be effective in optimizing bending mold force and the reduction of wrinkle and rupture. In the paper, the simulation and test of the rotational tube bending process will be presented with using elastomer mandrels of polyurethane elastomeric mandrels and NBR and then the crucial mechanical and physical properties for steel tubes of different diameters. Then the optimal parameters are determined for bending the tube without rupture with using mold force, internal and kinetic energy. The test results verify the simulation results. Manuscript profile -
Open Access Article
228 - Numerical Simulation of Pool Boiling Heat Transfer, Focusing On Surface Structural Characteristics In ANSYS Fluent: A review
Ermia Zargham Mohammad Hassan Nobakhti morteza khayatMultiphase flows, such as pool boiling, are complex multi-physical -multi-scale problems that require a multitude of numerical techniques to solve different physics combined for a specific set of flow parameters and different regimes. For this reason, a well-established MoreMultiphase flows, such as pool boiling, are complex multi-physical -multi-scale problems that require a multitude of numerical techniques to solve different physics combined for a specific set of flow parameters and different regimes. For this reason, a well-established numerical solution for well-validated predictive simulations has not yet been clearly defined. The main purpose of this study is to summarize the methods and basic principles of numerical simulation of pool boiling and explain all the steps of its implementation in ANSYS Fluent software in a clear and transparent manner. In this research, the details of numerical models and the results obtained for the nucleate boiling regime are presented to analyze the single bubble dynamics and calculate the critical heat flux. Heat flux is also included. The results of this study show that numerical simulations have a relatively good agreement with laboratory and experimental data. Manuscript profile -
Open Access Article
229 - Numerical simulation of smoke behavior in fire conditions in a short urban tunnel
Mehdi RafieiAlong with the increasing development of countries, the daily need to transport various goods and equipment and travel in general for many reasons is increasing and for this reason, the number of different types of cars has significantly increased in recent years. In th MoreAlong with the increasing development of countries, the daily need to transport various goods and equipment and travel in general for many reasons is increasing and for this reason, the number of different types of cars has significantly increased in recent years. In this way, this issue has caused heavy traffic on highways and various roads in big cities. Various actions and approaches, including public transportation, have been taken into consideration to facilitate the traffic. However, in some cases the solution to facilitate traffic jams, especially in big cities, is to build urban tunnels. Therefore, in recent years, urban tunnels have been considered as a solution to facilitate traffic. In this regard, the study of safety in tunnels becomes very important. The aim of this article is to simulate a fire in a short tunnel with natural ventilation to consider the behavior of smoke in different scenarios of natural air flow in the tunnel. The results of CFD simulation showed that limited fire (usual small passenger cars) will not cause problems for people as well as rescue team, especially fire extinguishing. Manuscript profile -
Open Access Article
230 - Simulation of clearance effect on LDR in stainless steel deep drawing
Ali Fathi Jokandan Mehrdad Ozve AminianDeep drawing is one of the most important processes in the sheet metal forming industry where a flat sheet is drawn by the punch into the hole matrix And It takes the shape of the punch. The effective parameter in this process is clearance between punch and matrix MoreDeep drawing is one of the most important processes in the sheet metal forming industry where a flat sheet is drawn by the punch into the hole matrix And It takes the shape of the punch. The effective parameter in this process is clearance between punch and matrix. Finite element method is a useful tool for the study of process and impact parameters affecting it. In this project the effect of clearance between punch and matrix on LDR was considered and result are showed 0.9 mm clearance is more optimum suitable for 0.6 mm sheet thickness in deep drawing and decreased to 0.66 mm clearance the LDR was decreased. Manuscript profile -
Open Access Article
231 - Prediction of Urban Construction Changes Using Satellite Images Based on CA-MARKOV Models (case study: Sari)
Sahab Bidgoli Kashani Mehran Fadavi Valiollah AzizifarAlong with the ever-increasing urban population, the amount of construction in the city space has been developed. The development of construction in the horizontal space and regardless of the existing restrictions has led to environmental, economic and legal problems fo MoreAlong with the ever-increasing urban population, the amount of construction in the city space has been developed. The development of construction in the horizontal space and regardless of the existing restrictions has led to environmental, economic and legal problems for the citizens. Achieving the amount, intensity and direction of construction development from the past to the present and predicting the construction situation in the future is the first step towards the scientific and practical management of the physical development of urban construction, planning and providing suitable solutions in order to create a balance between allocation Spatial-spatial construction and all kinds of legal, economic and environmental considerations. Data and information extracted from satellite images, while showing the historical changes of urban construction, are used as the main, necessary and necessary input data for models to predict its future state. In this research, satellite images of TM, ETM+ and OLI sensors of Landsat satellite were used in the time periods of 1997-2007 and 2007-2017 related to the city of Sari. After performing geometrical corrections, city area maps were prepared. Then, by using the effective parameters in urban construction changes, using the Cellular Automata(CA) Markov Model, the accuracy of the simulations was checked. Finally, for validation, the simulated maps and the ground reality map were matched with each other. The simulation of the construction development process in 2027 using the CA-Markov model showed that if the existing management regulations continue, this area will decrease from 4617.90 hectares in 2017 to 4357.44 hectares in 2027. But the examination of change maps and stability maps showed that new areas will be under construction between 2017 and 2027, which were mainly used for agriculture and barren land. Manuscript profile -
Open Access Article
232 - Designing an intelligent dynamic model of preventive maintenance and repairs in the textile and clothing industry in the interaction of production with the help of simulation (a case study of Borujerd textile factories)
سیدشهرام فاطمی مهرداد جوادی اسماعیل نجفی امیر عزیزیAbstractThe aim of the research is "designing a smart dynamic model of preventive net using simulation in interaction with production" based on the documentation of textile and clothing industries under the title of dynamic preventive net model. In order to calculate th MoreAbstractThe aim of the research is "designing a smart dynamic model of preventive net using simulation in interaction with production" based on the documentation of textile and clothing industries under the title of dynamic preventive net model. In order to calculate the dynamics of the system, Vansim software and research data were prepared based on a sample of 2000 data and reports from the textile and clothing industries during the years 2016 to the end of 2014 and the textile factories of Borujerd as the location of the project on a semi-annual basis. The results of the research show that the growth rate of "working environment on the net" has reached the lowest growth rate of 1.2% in 2016 and 3.5% in 2018 and a higher growth of 6% in 2014. The growth rate of "Internet technology" has reached an average growth rate of 1.2% in 1396, 5% in 1398, and a higher growth of 8.5% in 1400. The dynamic growth rate of the variable "Strategy in Net" has reached the maximum growth rate of 1% in 2016, 6% in 2018, and a higher rate of growth in 2014, i.e. 9.5% (optimal state). Manuscript profile -
Open Access Article
233 - Structural and molecular analysis of SARSCoV-2 spike protein following S494P point mutations using bioinformatics and molecular dynamics methods.
Mehr Ali Mahmood Janlou Hasan Saheb jamii elham tazikeh lemeskiThe emergence of some mutations in the SARS-CoV-2 receptor binding domain (RBD) can increase the spread and pathogenicity due to the conformational changes and increase the stability of Spike protein. Due to the formation of different strains of SARS-CoV-2 by mutations, MoreThe emergence of some mutations in the SARS-CoV-2 receptor binding domain (RBD) can increase the spread and pathogenicity due to the conformational changes and increase the stability of Spike protein. Due to the formation of different strains of SARS-CoV-2 by mutations, and their catastrophic effect on public health, the study of the effect of mutations by scientists and researchers around the world is inevitable. According to available evidence, the S494P variant is observed in several SARS-CoV-2 strains from Michigan, USA. To investigate how the S494P natural mutation alters receptor binding affinity in RBD, we performed structural analysis of wild-type and mutant spike proteins using some bioinformatics and computational tools. The results show that S494P mutation increases the spike protein stability. Also, applying docking by HADDOCK displayed higher binding affinity to hACE2 for mutant spike than wild type possibly due to the increased β-strand and Turn secondary structures which increases surface accessibly surface area (SASA) and the chance of interaction. The analysis of S494P as a critical RBD mutation may provide the continuing surveillance of spike mutations to aid in the development of COVID-19 drugs and vaccines. Manuscript profile -
Open Access Article
234 - In silico study to Identify New Inhibitors of Staphylococcus aureus (S. aureus) Sortase A
hassan sahebjamee Mehr Ali Mahmood JanlouIntroduction: Inhibition of key enzymes in bacteria that exert low evolutionary pressure can be a drug development strategy for bacterial antibiotic resistance. Sortase A (Srt A) is a transpeptidase that is widely used in site-specific protein modification. This enzyme MoreIntroduction: Inhibition of key enzymes in bacteria that exert low evolutionary pressure can be a drug development strategy for bacterial antibiotic resistance. Sortase A (Srt A) is a transpeptidase that is widely used in site-specific protein modification. This enzyme has a key function in the interactions between Staphylococcus aureus and the host and has been considered a promising target for the drug development of resistant bacteria. To date, some Srt A inhibitors have been discovered most of them are derived from flavonoid compounds, like myricetin. Aim: Since computational methods for monitoring the behavior of biomolecules at the microscopic level are more accurate and cost-effective, therefore, in this research, our goal is to use computational methods to find similar molecules but with higher binding and inhibitory effect than myricetin. Materials and Methods: In this study, we used computational methods such as structure-based virtual screening, molecular docking, MM-PBSA approach, and MD simulation. A molecular docking approach was used to understand protein-ligand interactions and inhibition constants in terms of affinity. MD simulation technique was used to monitor the conformational changes of Srt A enzyme. After the MD simulation studies, the MM-PBSA approach was used to interpret the binding free energy. Results: First, Chemspider's chemical library was screened by the "Similarity search" method, in which myricetin was placed as a reference molecule. The second stage of screening was done using PyRx software, so that the top 10 compounds were carefully selected based on their inhibitory potential from the set of ligands obtained from the previous stage. These compounds were subjected to Autodock4.2 for molecular docking. As a result, it was observed that compound-73945561 has a higher inhibitory effect than myrsteine. To investigate the stability and efficiency of ligand binding mode, free Srt A, its complexes with myrsteine and the best selected compound were subjected to 50s molecular dynamics simulation. MD simulation results showed that compound-73945561 had better binding profiles and interactions than myrsteine as a reference inhibitor, and steadily unstable behavior was observed in the docking complex. Conclusion: Overall, compound-73945561 may serve as a new inhibitor or provide a scaffold for further optimization toward the design of more potent SortA inhibitors. The development of such inhibitors would be an essential strategy against resistant bacteria. Manuscript profile -
Open Access Article
235 - Comparative study of computer simulation softwares
fatemeh fakhar -
Open Access Article
236 - The Intelligent Modeling
M Asghari M. A Badamchizadeh M. E Akbari -
Open Access Article
237 - A Novel Self-tuning Zone PID Controller for Temperature Control via a PLC code
abbas rezaei ashtiyani majid ghandchi -
Open Access Article
238 - Analysing the Climatic Impact of Central Courtyards in Traditional Houses of Tabriz
Sasan Moradi Mehrdad Matin Rima Fayaz -
Open Access Article
239 - Role of Environmental Simulation at the Early Stage of Design in Order to Achieve Outdoor Thermal Comfort: A Case Study of Ekbatan and Apadana Residential Complexes in Tehran, Iran
Mehdi Khakzand Morteza Ojaqlou Mohsen Faizi Mina Vard -
Open Access Article
240 - Finding the Best Orientation of the Educational Buildings in Hot Arid Regions in Iran, in order to achieve theOptimum Annual Energy Consumption, Using Computer Simulation (Case Study: a Double Class School in Zahedan)
Hamid Aibaghi Esfahani Kourosh Momeni Faramarz Hassan Pour -
Open Access Article
241 - Improving the energy efficiency of existing residential buildings by applying passive and cost-effective solutions in the Hot and humid region of Iran
Amin Mohammadi Joseph Daraio -
Open Access Article
242 - Evaluation of Noise Pollution in the Architectural Site Analysis Process based on Environmental Impact Assessment Matrix
Mehrdad Azizi Mahmud Rezaei Vahid Ghobadian -
Open Access Article
243 - Optimal window area of a kinetic facade to provide daylight in an office building in Tehran.
Fataneh Sangtarash Rima Fayaz niloufar Nikghadam Mohammad Reza Matini -
Open Access Article
244 - QSAR, Molecular docking and Molecular dynamics studies simulation of Epigenetic inhibitors
ghasem ghasemi babak motahary Robabe SayadikordAbadi omid alizadehDevelopment of QSAR and molecular docking is a key to the elucidation of pathomechanisms of epigenetic diseases. Quantitative structure- activity relationship (QSAR), Molecular docking and molecular dynamics simulation were carried out for some modulators of modified ch MoreDevelopment of QSAR and molecular docking is a key to the elucidation of pathomechanisms of epigenetic diseases. Quantitative structure- activity relationship (QSAR), Molecular docking and molecular dynamics simulation were carried out for some modulators of modified chromatin proteins as anticancer agents. The Imperialist Competitive Algorithm (ICA), partial least squares (PLS), Principle component regression(PCR), Coralsea,and Multiple Linear Regression (MLR) were used to achieve the QSAR models. Suitable descriptors were selected which includes features such as atomic mass, Van der waals volume, shape and geometrical structure of compounds. Then, molecular docking studies were performed using Autodock Vina software which had a high throughput accuracy. Based on features such as number of hydrogen bonds, bonding length, binding affinity, and also root-mean-square deviation (RMSD), the best complex were selected. In general, QSAR, molecular docking and molecular dynamics simulation illustrated that compounds 9 and 14 were selected as suitable agents for the design of anticancer drugs. Drug-likeness descriptors of compounds calculated by DruLiTo. In the molecular docking study, the maximum binding affinity of -9 kcal/mol was obtained between each of enzyme systems (PDB: 3MXF) and the geometric-optimized molecules, representing a strong interaction. Manuscript profile -
Open Access Article
245 - Black Widow Optimization (BWO) Algorithm in Cloud Brokering Systems for Connected Internet of Things
Nasim Jelodari Ali AsgharPourhaji Kazem -
Open Access Article
246 - Coordination Approach to Find Best Defense Decision with Multiple Possibilities among Robocup Soccer Simulation Team
Ashkan Keshavarzi Nader Zare -
Open Access Article
247 - Simulation of Fabrication toward High Quality Thin Films for Robotic Applications by Ionized Cluster Beam Deposition
Esmaeil Zaminpayma -
Open Access Article
248 - A Survey of Solutions to Protect Against All Types of Attacks in Mobile Ad Hoc Networks
Maryam Fathi Ahmadsaraei Abolfazl Toroghi Haghighat -
Open Access Article
249 - Delay Model Estimation in RC-tree Circuits Based on the Power-lognormal Distribution
Farshad Safaei -
Open Access Article
250 - System dynamics modeling for assessment of customer satisfaction criteria at the level of comprehensive quality management
Hasan Dehghan Dehnavi Zahra DelshadSuccess of comprehensive quality management is associated with the ability to learn, absorb, adapt and implement changes in organizational attitudes and their integration into the organization. The condition of the organization's success is to improve the company's perf MoreSuccess of comprehensive quality management is associated with the ability to learn, absorb, adapt and implement changes in organizational attitudes and their integration into the organization. The condition of the organization's success is to improve the company's performance in the area of rapid accountability in a customer-focused organization and operations based on comprehensive quality management. The purpose of this study is to investigate and improve the quality of customer-orientation using the system's dynamical approach. In this study, by reviewing the theoretical literature and a survey of experts and experts, the criteria for customer expectations were identified. After identifying components and customer expectations variables, simulation was started by providing dynamic hypotheses and causal circles, flow diagrams, and mathematical equations were completed. For this purpose, the Vensim software dynamics model provides a way to find out the relationship between the factors associated with meeting customer expectations. The results of this research can be used for industries that intend to plan for meeting the expectations of customers at the level of comprehensive quality management. Manuscript profile -
Open Access Article
251 - Improving throughput of shahid rajaee harbor using simulation and multiple criteria decision making
Ali Khatami Firouz Abadi Laya Olfat Ali Mohtashami Mohsen Rahimi Mazare ShahiIn this paper we evaluate the optimum composition of improver alternatives for loading and unloading operations in container terminal of shahid rajaee harbor in iran. We will use simulation and multiple criteria decision making for this purpose. To simulating system an MoreIn this paper we evaluate the optimum composition of improver alternatives for loading and unloading operations in container terminal of shahid rajaee harbor in iran. We will use simulation and multiple criteria decision making for this purpose. To simulating system and improver alternatives we use ARENA software and to analyze alternatives we use AHP and TOPSIS technique. In this research, 4 main alternatives and 4 decision making criteria are considered for ranking. 4 main alternatives are berth, gantry crane, transtainer, reach staker, and 4 decision making criteria are cost, life time, lead time, amount of annual loading and unloading. Considering the constraints of system for increasing facilities and also considering decision making criteria, the best alternative to improve system were specified. This alternative is created by composition of 5 berth, 15 gantry crane, 38 transtainer, and 44 reach staker. Manuscript profile -
Open Access Article
252 - Optimization the layout of filling station by simulation in queue theory
Sadegh Abedi Reza Radfar Naser HamidiEnergy and fuel crisis and magnified demands for fuel consumption caused varies challenges in the word. With19889 million liter annual consumption of gasoline, according to international reports, Iran is the tenth country in the word. In recent years, tremendous increas MoreEnergy and fuel crisis and magnified demands for fuel consumption caused varies challenges in the word. With19889 million liter annual consumption of gasoline, according to international reports, Iran is the tenth country in the word. In recent years, tremendous increases in fuel prices brought optimization and management of fuel consumption into the limelight. In this paper we are trying to maximize the capacity of filling stations and to elevate customer’s satisfaction through modeling these stations. Queue theory and simulation are instruments that we used in this research. Manuscript profile -
Open Access Article
253 - A Desirable Model for Optimizing the Policy of Service to Customers with Simulation Queue and MCDM Approach
Mahmud Modiri Nooredin AnvariTodays, Post Corporation is played an important role to decrease the traffic mass, air pollution and speedup the works. These organizations are classified as a service organization dealing with costumers and staffs. Every days, these organization is faced with large amo MoreTodays, Post Corporation is played an important role to decrease the traffic mass, air pollution and speedup the works. These organizations are classified as a service organization dealing with costumers and staffs. Every days, these organization is faced with large amount of people which standed in queues. Analysis of queuing systems and decrease the UNFAVORABLE effects of expect is, one of the most noticeable subjects in practical mathematic and operation research. This research is followed above trend. Moreover it is helped to post corporation to decrease their problem providing reasonable services to costumers. First, the problem is defined. Next, system of office queuing is recognized. Finally the total office is chosen in Alborz province for starting special study and determining the way of giving service presentation to costumers as well. As a result, a mathematic model is exhibited based on queuing system structure. The results are shown with Enterprise Dynamic simulation software. The most important advantage of this software is, helped to optimize the system and to predict the function. At the end of study, 4 patterns are also proposed based on experts view. Moreover, three indexes are chosen for evaluation. After all, sequence of models is done based on Topsis Procedure. Manuscript profile -
Open Access Article
254 - Effect of Experiential Learning in Management and Performance of Organizations through Simulation with Chess
Mahtab Nabi Bidhendi Gholamhassan ShirdelOrganizations and offices are one of the main principles in human society. Management and leadership are among the most important indices of survival and destruction in organizations. Given the importance of competition among organizations, managers should select the mo MoreOrganizations and offices are one of the main principles in human society. Management and leadership are among the most important indices of survival and destruction in organizations. Given the importance of competition among organizations, managers should select the most appropriate method in order to achieve their goals earlier than rivals. The question raised in this regard is whether experiential learning influences the management and performance of organizations. One of the effective methods for experiential learning is simulation because it provides users with the opportunity to investigate different solutions and results at the lowest risk and cost and in the shortest time. chess simulation is thought to be one of the most direct methods to use experiential learning model because it creates opportunities to use a number of management tools. Employing chess principles and methods and investigating the relevant impacts on organization and performance, the goals and resources of large organizations (human resources) and barriers to the achievement of goals were taken into account in this study. The parameters were considered to be chess pieces (according to the importance of organizational parameters), and different games were designed. After implementing the scenarios (games) in Arena, the most appropriate scenario was extracted and implemented to achieve organizational goals. Finally, the best scenario would be the one having highest score and lowest number of moves in the game of chess. Manuscript profile -
Open Access Article
255 - Monte Carlo Simulation to Compare Markovian and Neural Network Models for Reliability Assessment in Multiple AGV Manufacturing System
Hamed Fazlollahtabar Mohamma Saidi-Mehrabad -
Open Access Article
256 - Performance Improvement through a Marshaling Yard Storage Area in a Container Port Using Optimization via Simulation Technique (Case Study at Shahid Rajaee Container Port)
Mohammad Reza Ghanbari Parham Azimi -
Open Access Article
257 - A New Dynamic Random Fuzzy DEA Model to Predict Performance of Decision Making Units
Ali Yaghoubi Maghsoud Amiri Azamdokht Safi Samghabadi -
Open Access Article
258 - Productivity Improvement through Line Balancing by Using Simulation Modeling
Aregawi Yemane Gebremedhin Gebremicheal Teklewold Meraha Misgna Hailemicheal -
Open Access Article
259 - Determination of Criticality Indexes in the Remanufacturing Process: A GERT-based Simulation Approach
Elham Babaei Abdollah Aghaie Mojtaba Hajian heidary -
Open Access Article
260 - Productivity Improvement of BOB T-shirt through Line Balancing Using Control Limit analysis and discrete event simulation (Case study: - MAA Garment and Textile Factory)
aregawi yemane -
Open Access Article
261 - Performance Measurement and Improvement of Healthcare Service Using Discrete Event Simulation in Bahir Dar Clinic
aregawi yemane hagazi heniey kidane Gidey Gebrehiwet -
Open Access Article
262 - Daily Rainfall Forecasting Using Meteorology Data with Long Short-Term Memory (LSTM) Network
Soo See Chai Kok Luong Goh -
Open Access Article
263 - Performance Analysis of Remanufacturing System Considering Inspection & Grading Policies, Sourcing Policies and Resource Policies Under Multiple Quality Scenarios: Towards Environmental Sustainability
Magdalene Andrew-Munot Shirley Jonathan Tanjong -
Open Access Article
264 - Modelling of Crowd Evacuation with Communication Strategy using Social Force Model
Cheah Shiang Norhaida Hussain -
Open Access Article
265 - Assessing the impact of environmental aspects, land use, and R&D policies on peri-urban agriculture using a system dynamics approach
Armin Cheraghalipour Emad Roghanian -
Open Access Article
266 - A Review of Three Decades Using Agent-Based Modelling and Simulation in Marketing and Consumer Behavior
Zahra Sadeqi-Arani Omid Roozmand -
Open Access Article
267 - A Hybrid Meta-Heuristic Method to Optimize Bi-Objective Single Period Newsboy Problem with Fuzzy Cost and Incremental Discount
Ata Allah Taleizadeh Seyed Taghi Akhavan Niaki -
Open Access Article
268 - A Simulation Model for Optimization of the Internal Handling Fleet Size at Shahid Rajaee Container Port Based on Performance Evaluation
Parham Azimi Mohammad Reza Ghanbari -
Open Access Article
269 - A New Hybrid Algorithm to Optimize Stochastic-fuzzy Capacitated Multi-Facility Location-allocation Problem
Esmaeil Mehdizadeh Mohammad Reza Tavarroth Vahid Hajipour -
Open Access Article
270 - Numerical Simulation of the Segmental Tunnels Performance in the Swelling Rocks
Arash Jeddi Rouzbeh Dabiri -
Open Access Article
271 - Determining the Likelihood of Damage in Concrete and its Physical Structure
leila Shahryari -
Open Access Article
272 - The characteristics of the optimal sunlit space according to operative temperature and energy simulation in mountain villages (Case study: Shemiranat villages of Tehran)
Sepideh Babazadeh Saloot , Mansoureh Tahbaz, Leila Karimifard, Seyed Amir MansouriThe alleys of the villages are the narrators of the people who were the creators of architecture not so long ago, which today is the study platform of many researchers for the settlement and construction of Iran.What causes this attention and importance is the achieveme MoreThe alleys of the villages are the narrators of the people who were the creators of architecture not so long ago, which today is the study platform of many researchers for the settlement and construction of Iran.What causes this attention and importance is the achievement that is the result of years of life experience of rural people.In order to preserve and maintain the villages, it is inevitable to pay attention to harmony with the environment, landscape and climate and to use renewable energies instead of fossil fuels. This research deals with one of the most important and fundamental components of climate and environmental compatibility, that is, paying attention to solar energy in rural houses in cold and mountainous areas.Paying attention to the space of the sunny courtyard in the body of rural houses, although it is related to the architecture of the past; But paying attention to solar energy is not limited by time and the mutual and inevitable connection of local context and new constructions shows the important fact that in order to maintain kinship and connection between rural structures and to optimize and save energy consumption, reflection and attention to local patterns and creating links In the form of new and modern architecture, it is vital, important and valuable for the village.The main goal of this research is to identify and introduce the sunlit space and to express its role in creating a micro-climate in order to benefit from renewable solar energy and save energy.The basic and important question of this research is, what are the characteristics of a favorable and effective sunlit space in microclimate and what factors does it depend on? And what role does new architecture and construction have on the quality of the sunlit space, sometimes neglecting the solar envelope and creating unwanted shadows on the sunlit space of the vernacular houses?This research is an applied research in terms of its purpose and it is a qualitative-quantitative research in terms of its nature.Collecting the information of this research was done by library and documentary method and a significant part of it was done in the field and in the villages.The sample community in this research was the mountain villages of Shemiranat, Tehran, based on factors, 10 villages were selected, and after many observations in these villages, 40 native houses were visited, studied and analyzed. The studied statistical population, along with conversations and qualitative interviews with the villagers and residents of these native houses, a selected example with a dominant sunny courtyard, was simulated by Design Builder software in order to answer the problem and validate the local conversations. The design builder software that was used in this research is a building energy performance simulation user interface that uses the Energy Plus simulation engine. This tool calculates and analyzes the heat transfer from different levels of the building throughout the year and estimates the temperature of the indoor environment. In this way, by taking into account the type of facility system and taking into account the appropriate temperature of the environment, the amount of energy consumption of the building can be obtained.According to the results of the research and many examples observed in the mountain villages, the quality of the sunny courtyard and the extent of its influence in creating a microclimate are dependent on several factors that oblige the builders of rural housing to comply with the rules in construction.The idea of using the sunlit space is often suitable for climates that are cold and there is a need to intensify the flow of solar energy and heat into the building; Therefore, as much importance is given to energy absorption as it is to preserve it in the internal environment. Therefore, using a covered balcony, which the villagers do with experience, and cover the sun porches and courtyards with plastic in winter, will create an uncontrolled space (similar to a greenhouse) that will also contribute to the energy supply of the company. and it is very effective and by reducing the temperature difference, it will reduce heat loss; Therefore, in general, the issue of design should be looked at as a set of solutions, and definitely one element or factor alone will not guarantee ideal and optimal conditions. Manuscript profile -
Open Access Article
273 - Simulation of Grain Yield and Biomass of Corn at Different Irrigation Regimes and Nitrogen Application
مهتا Haghjoo A. BahraniDSSAT-CMS computer model simulates growth, development and crop production under the management conditions such as variation in soil moisture, soil carbon, soil nitrogen and nitrogen leaching. In this study, first CERES-Maize model with 20% moisture depletion and then g MoreDSSAT-CMS computer model simulates growth, development and crop production under the management conditions such as variation in soil moisture, soil carbon, soil nitrogen and nitrogen leaching. In this study, first CERES-Maize model with 20% moisture depletion and then grain yield and biomass of corn at harvesting time were calibrated. Calibration coefficients for corn single cross 260 were P1=169, P2=0.386, P5750, G2=775.9, G3=8.82 and PHINT39.20. Results showed that the model estimates grain yield and biomass in normalized mean root of error squares (RMSEn), Wilmot agreement index (d) and correlation (R2) coefficient at 18, 90 and 82 percent and 29, 84 and 84 percent respectively. Therefore, CERES-Maize model has the high precision in simulation of these two traits and also simulation was desirable in Shiraz region. The model simulated grain yield better than biomass. In general, the model can be used for irrigation and nitrogen management in the region. Manuscript profile -
Open Access Article
274 - Evaluation of Linear and Nonlinear Regression Models to Describe Response of Germination to Temperature in Lentil (Lens culinaris Medik. )
سمانه Rahban Gh. Rassam B. Torabi A. Khoshnood YazdiThis study was carried out to determine the requirements of cardinal temperatures and biological hours for germination of lentil by using different linear and nonlinear regression models. To do this, a split plot experiment based on randomized completely design with fou MoreThis study was carried out to determine the requirements of cardinal temperatures and biological hours for germination of lentil by using different linear and nonlinear regression models. To do this, a split plot experiment based on randomized completely design with four replications was conducted in germinator. Experimental treatments were three lentil cultivars (Gacgsaran, Kimia and Bilehsovar) under seven fixed temperature regimes (5, 10, 15, 20, 25, 30 and 35°C). Beta, Dent-like and Segmented models were applied to evaluate the relationship between germination rate and temperature. Root mean square deviation (RMSD), coefficient of determination (R2), coefficients of variation (CV (and linear regression coefficients (a, b) were used to detect the perfect model. Results of fitting the models indicated that the response of lentil germination to temperature is best described by a segmented function. Cardinal temperatures estimated by this model were 0.89 to 1.23°C for base temperature, 23.41 to 26.94°C for optimum temperature and 35.15 to 45°C for ceiling temperature. Significant difference in base temperature among cultivars was not observed, but cultivars had significant difference in optimum and ceiling temperatures. Biological hour's requirement for germination ranged between 25.43 to 31.37 hours. The quantitative information provided by this research can be used in prediction of germination of lentil cultivars. Manuscript profile -
Open Access Article
275 - Evaluation of AquaCrop Model in Simulating Yield and Water Use Efficiency of Three Corn Hybrids under Hot-Dry Climatic Conditions
Yaser Esmaeilian Mahmoud RamroudiNowadays, crop simulation models have a key role in crop growth and yield estimation, production planning, production economy and identifying strategies for crops supply. In this research, AquaCrop model was calibrated and evaluated for three corn hybrids; (DC 370, ZP 6 MoreNowadays, crop simulation models have a key role in crop growth and yield estimation, production planning, production economy and identifying strategies for crops supply. In this research, AquaCrop model was calibrated and evaluated for three corn hybrids; (DC 370, ZP 677, and SC 704) under different levels of water supply (non stress, mid stress, and severe stress) and nitrogen rates (0, 120, 180, and 240 kg N/ha). For model validation, normalized root mean square error (nRMSE) and determination of coefficient (R2) were used. Result showed that the model simulated grain yield of corn hybrids with high precision. Simulation precision decreased with increasing drought stress. The lowest nRMSE (7.5%) and highest R2 (0.93) were obtained from ZP 677 hybrid. The model simulated corn biological yield with more deviation percentage than grain yield. However, it´s variation trend due to variation in drought stress level or nitrogen fertilizer predicted well according to field experiment. nRMSE ranged from 6.8 and 10.9, while R2 varied from 0.82 to 0.92. AquaCrop model simulated the variation of water use efficiency of corn hybrids with reasonable accuracy, so that it´s value increased with increasing drought stress and nitrogen fertilizer application, while, model outputs in most situations were lower than measured values. The best model validation result (nRMSE=6.4% and R2= 0.93) obtained from ZP 677 hybrid. According to the results were obtained, AquaCrop model can be applied with high reliability for simulating corn yield under similar climatic regions of this experiment. Manuscript profile -
Open Access Article
276 - Artificial Simulation in Viewpoints of Sunni Jurists
Seyed Reza Ehsanpour Hadi Garakani Madiheh HashempourSunni jurists have different views about the artificial simulation. Permission or forbiddance of simulation depends on its type: IUI or IVF. Most of the jurists who oppose IUI believe that it is against the Quran verses and Sunna of Holly Prophet and results in disturbi MoreSunni jurists have different views about the artificial simulation. Permission or forbiddance of simulation depends on its type: IUI or IVF. Most of the jurists who oppose IUI believe that it is against the Quran verses and Sunna of Holly Prophet and results in disturbing the lineage. In addition, IUI surgery pre-requirements are ejaculation by sperm donor and touching body of women by physician to simulate, which both of them are forbidden. On the other side, those jurists who are in believe of artificial simulation surgeries answers: there are no clear and explicit Islamic verses, which ban this kind of surgery, it never results in lineage disturbance and ejaculating for obtaining sperm from husbands by their wives will solve the forbiddance (Hurmat). In addition, there is a juridical rule saying: Necessities makes bans and forbiddance permitted. Arguments about simulating by sperm of dead or divorced husband are more controversial. In sum, most of the Sunni jurists believe that artificial simulation is permitted only if done in waiting time of death and divorce. These arguments are also true about IVF but some jurists depended it on some conditions including ensuring the right of the fetus life. Manuscript profile -
Open Access Article
277 - The Effectiveness of Simulation-Based Teaching in Physics on Secondary School Students' Creativity in Isfahan in the Academic Year 2018-2019
Mohammad Javad khoshtale Farzaveh VasefianThe purpose of this study was to determine the effectiveness of simulation teaching method in physics course on creativity of second high school students in Isfahan city during the academic year 2018-2019. The research method is quasi-experimental design with pre-test a MoreThe purpose of this study was to determine the effectiveness of simulation teaching method in physics course on creativity of second high school students in Isfahan city during the academic year 2018-2019. The research method is quasi-experimental design with pre-test and post-test design. In order to measure creativity based on Torrance's view, Abedi's creativity test was used in the four subscales of Fluency, Elaboration, Intivative, and Flexibility. For this purpose, 50 high school students were selected from Isfahan Secondary High School in Experimental Sciences in Physics by multi-stage cluster random sampling. The learners were trained in two groups of 25 students with different fields of study, experimental group with simulation teaching method and control group with traditional teaching method without any intervention for eight weeks, each session for 90 minutes. For all test and control groups, one teacher was used for learning. Data were analysed by SPSS 25 software at two levels of descriptive and inferential statistics using multivariate analysis of covariance (Mankova). Finally, the results of the analysis showed that the simulation-based teaching method can have a significant difference in the fluid, elaborate, and creative subscales (P<0.05), but there is no significant difference in their creativity flexibility component (P>0.05). Overall, this style of teaching promoted creativity in these learners. Manuscript profile -
Open Access Article
278 - Project Efficiency Estimation Based on Dynamic Simulation Model of Earned Value Management
Mojtaba Bakhshandeh Yahya Zare MehrjerdiEarned Value Management (EVM) is known as an efficient and well-known tool for project management. Examining various sources, it was observed that although the EVM analytical model has introduced good indicators for measuring project progress, it is weak in estimating t MoreEarned Value Management (EVM) is known as an efficient and well-known tool for project management. Examining various sources, it was observed that although the EVM analytical model has introduced good indicators for measuring project progress, it is weak in estimating the final cost of the project and does not predict the process of cost change and project efficiency. On the other hand, nothing has been done so far to use system dynamics in EVM.Therefore, considering the capacity of system dynamics in modeling complex systems and setting parameters dynamically based on model variables, the main problem of modeling research is the value model obtained by simulating system dynamics. The dynamic hypothesis of the research was that there are dynamics between the main indicators of EVM. Identifying these dynamics and the way they affect each other can lead to estimating the process of changing costs and project efficiency by the end of the project.Through presenting the causal loop diagram and the stack flow diagram of the proposed model, the variables were determined and after simulation, the model was validated by performing various tests and different policy scenarios were presented.The comparison of the results of the research simulation model with the results of the EVM analytical model revealed that there is a slight difference between the results and the efficiency. The main contribution of the research is the creation of a simulation model based on system dynamics as the core of the simulation to estimate the trend and the final amount of efficiency and cost of the project, which can be part of a more comprehensive simulation model.This can be used to determine the impact of various project management functions on improving project efficiency, which is the main suggestion for further research. Manuscript profile -
Open Access Article
279 - Interval Estimate of Project Time Completion Using Simulation Approach
Amin Zeinalzadeh Jafar Hosseini Dolama Majid Bagerzadeh KhajehThis paper aims to utilize an approach for computing time completion of project network paths with determined activities that can be used to estimate the time completion of a project. Activity durations are considered to be deterministic in critical path method (CPM). S MoreThis paper aims to utilize an approach for computing time completion of project network paths with determined activities that can be used to estimate the time completion of a project. Activity durations are considered to be deterministic in critical path method (CPM). Since it is impossible to predict future events in a deterministic manner, project evaluation and review technique (PERT) is introduced which studies project with probabilistic activity durations. In this technique, large variance of path durations can influence the calculation accuracy, in which case the simulation technique is an appropriate method. In this paper, a sample arrow network is chosen, and a time distribution is fitted for each activity with Input Analyzer Software using some historical data. Mean square error, chi-square and Kolmogorov-Smirnov (K-S) tests are used as three measures to evaluate the goodness-of-fit. In the next stage, a computer model is built for the network in Arena 7.0 software. This model is run 120 times and based on these replications, the minimum required sample size for (1-α) Í100% confidence interval is specified. Finally, a confidence interval is computed for duration of each network path and based on this; the time completion of project is estimated. Manuscript profile -
Open Access Article
280 - Evaluating the Role of Urban Form in Energy Consumption of Building Masses and Thermal Comfort of Open Urban Spaces in the Hot and Dry Climate
Maryam Farokhi Shahab KariminiaIn the past, cities have been good examples of energy-efficient urban design in terms of ecological constraints. Looking at traditional cities and comparing them with modern urban planning, we see adverse environmental consequences in the scale of design of building uni MoreIn the past, cities have been good examples of energy-efficient urban design in terms of ecological constraints. Looking at traditional cities and comparing them with modern urban planning, we see adverse environmental consequences in the scale of design of building units and the spatial structure of cities. Therefore, it seems necessary to identify the effective factors in the design of traditional sustainable cities, using simulation software before the project or in the proposed options, to the optimal forms in the components (individual buildings) and Urban combinations (urban textures) was achieved. The present research combines descriptive-analytical methods, typological studies, drawing and simulation of models, following the analysis of energy consumption and thermal comfort in different types of building forms, urban blocks, and spatial structure of Isfahan in 4 historical periods. Therefore, by using energy simulation software (Design Builder) and thermal comfort (Envi-Met) and analysis of Space Syntax, the relationship between independent variables (physical and spatial characteristics of the urban fabric) and dependent variables, the amount of energy consumption (to provide heating, cooling, and lighting) and thermal comfort, in each of the proposed scenarios, has been investigated. Based on the results, it is possible to formulate guidelines for the climatic design of urban structures in the form of three components; The system and pattern of segmentation and segregation of urban land, the shape and characteristics of the mass/space in urban contexts and the pattern of the network of texture passages, regulation, and operational construction. The dominant forms of the Qajar period are more sustainable forms than other historical periods in terms of energy performance and adaptation to the climate. Also, spatial structures with the highest degree of spatial connection can provide a higher percentage of thermal comfort conditions in urban open spaces. Manuscript profile -
Open Access Article
281 - Land Use Changes Modeling and Future Predictions Using CA-ANN Simulation in the Watershed of 25 (Shenroud, Siahkal)
Roghayeh JahdiIn this study, we analyzed the spatial–temporal trends of land use dynamics from 2000 to 2021 using remote sensing data. The image classification was based on three main land use classes, i.e. forest, artificial areas (agriculture and built-up), and other natural MoreIn this study, we analyzed the spatial–temporal trends of land use dynamics from 2000 to 2021 using remote sensing data. The image classification was based on three main land use classes, i.e. forest, artificial areas (agriculture and built-up), and other natural areas (bare lands, grassland, plantation, shrubland, water bodies, and woodlands). Maps of land use changes in the area for 2000-2021 show that built-up areas have increased by 9.3%. In contrast, forest and other natural areas decreased by 7.1% and 2.2%, respectively. In addition, an integrated CA-ANN (Artificial Neural Networks- Cellular Automata) model was used to predict land use changes from 2021–2042. The percentage of correctness for the simulation was 91%, and the overall kappa value was 0.86. Similar to the classified maps in 2000-2021, the prediction maps from 2021–2042 illustrated increasing trends in built-up areas by 4.7% and decreasing trends in the forest by 4.26% and other natural areas by 0.4%. In this work, we implemented ordinary least squares (OLS) regression models to predict land cover changes in the study area as a function of explanatory variables [elevation, slope, and proximity variables - distance to the city center, roads, villages, and streams-]. The results of the OLS models showed a relatively good performance for predicting land use changes with an R-squared value greater than 0.5. These results provide important knowledge that can help develop future sustainable management and planning and help managers make informed decisions to improve environmental and ecological conditions. Manuscript profile -
Open Access Article
282 - An Integration of System Dynamics Modelling Approach into the Balanced Scorecard for a Case Study
Maryam Ebrahimi Amir Daneshvar -
Open Access Article
283 - Evaluation of green service supply chain performance in urban management of Tehran Municipality, using simulation
mahdi alizadeh mohammad mehdi movahedi hasanali aghajani -
Open Access Article
284 - Optimization of die geometry for Tube Channel Pressing
Mohammad Hassan Farshidi -
Open Access Article
285 - Finite element simulation of pyroplastic deformation, anisotropic shrinkage and heterogeneous densification for ceramic materials during liquid phase sintering process
Hamed Yaghoubi Esmail Salahi Fateme Taati -
Open Access Article
286 - Prediction of forging force and barreling behavior in isothermal hot forging of AlCuMgPb aluminum alloy using artificial neural network
hamidreza Rezaei Ashtiani p shahsavari -
Open Access Article
287 - 3D finite element study of temperature variations during equal channel angular pressing
Mehdi Shaban Ghazani A. vajd B. Mosadeg -
Open Access Article
288 - Plastic deformation of 7075 Aluminum Alloy using Integrated Extrusion-Equal Channel Angular Pressing
mehdi shaban sahel gozalzadeh beitallah eghbali -
Open Access Article
289 - Fabrication of Aluminum Rectangular Twist Waveguides: Experimental Investigation and FEM Simulation
Mina Amiri Ramin Ebrahimi -
Open Access Article
290 - Analytical and Numerical Evaluation of Wire Flat Rolling Process Based on the Slab Method and DEFORM-3D
Behzad Pasoudeh Hadi tagimalek -
Open Access Article
291 - Numerical Simulation Of Heat Affected Zone Microstructure During Laser Surface Melting
M Amin Jabbareh H Asadi -
Open Access Article
292 - An Investigation Into the Effects of Friction and Anisotropy Coefficients and Work Hardening Exponent on Deep Drawing With FEM
R Hosseini A Ebrahimi mamaghani A Asa -
Open Access Article
293 - Studying meso-scale eddies under the influence of coastal currents in the Persian Gulf and their role in the regional climate
امین رئیسی حسام الدین مهرفر* حسام الدین مهرفر* عباسعلی علی اکبری بیدختی عباسعلی علی اکبری بیدختی مسعود ترابی آزاد مسعود ترابی آزاد کامران لاری محمد جعفر ناظم السادات محمد جعفر ناظم السادات مجتبی عظام مجتبی عظامThe role of meso-scale eddies and coastal currents is of great importance in ocean and climate studies. In this regard, data related to the sea level height were extracted from the AVISO reference data series since 2010 to 2014, and meso-scale eddies were identified and MoreThe role of meso-scale eddies and coastal currents is of great importance in ocean and climate studies. In this regard, data related to the sea level height were extracted from the AVISO reference data series since 2010 to 2014, and meso-scale eddies were identified and tracked based on the sea level height and using ArcGiS software. Moreover, coastal currents were simulated by numerical COHERENS model to influence the formation of meso-scale eddies. The results showed an annual average of 78 meso-scale eddies with a minimum life span of one week, which are often cyclical (59.1%) and decrease the temperature of the region atmosphere. The largest activity area of meso-scale eddies is in the inlet of the Persian Gulf from the Strait of Hormuz and northwest of the Persian Gulf. The strongest eddies are observed in the summer, and in line with the simulation results, the currents with the highest intensities occur from June to August. Manuscript profile -
Open Access Article
294 - Encapsulation of Methane Molecules into C60 Fullerene Nanocage: DFT and DTFB-MD Simulations
Masoud Darvish Ganji Fahimeh Bonyasi Sepideh Tanreh Mahyar Rezvani Malak Hekmati -
Open Access Article
295 - Hydrogen storage capacity of Si-decorated B80 nanocage: firstprinciples DFT calculation and MD simulation
Masoud Darvish Ganji Nasim Ahmadian -
Open Access Article
296 - Molecular Dynamics Investigation of The Elastic Constants and Moduli of Single Walled Carbon Nanotubes
Mohammad Mahdi Zaeri Saeed Ziaei-Rad -
Open Access Article
297 - Design and Analysis of a Two stage Class AB Operational Trans-conductance Amplifier in 180 –nm Technology
shahrbanoo ghorbanzadeh hadi dehbovid Alireza ghorbani Seyed Mehdi Abedi Pahnekolaei -
Open Access Article
298 - Heat Transfer Analysis and Estimation of CHF in Vertical Channel
K. Dolati Asl E. ‎ Abedini‎ Y. Bakhshan‎ A. Mohammadi Karachi‎ R. Hamidi Jahromi -
Open Access Article
299 - Agent-based Simulation of Entry and Exit of Production Firms in Supplier-Dominated Industries
Zahra Asadollahi Sohi Hossein RaghfarThis article explores how different factors influence the number and dynamics of firms in supplier-dominated industries. These industries are typically traditional, small, and depend on external suppliers for innovation. The article uses a hybrid simulation of system dy MoreThis article explores how different factors influence the number and dynamics of firms in supplier-dominated industries. These industries are typically traditional, small, and depend on external suppliers for innovation. The article uses a hybrid simulation of system dynamics and agent-based modeling to capture the realistic assumptions that firms do not have complete market information and make decisions based on simple heuristics and past and current conditions. The article conducts experiments to examine how initial conditions, machine life, economic parameters, producer optimism, production growth rate, and demand elasticity affect the entry and exit patterns and the number of firms in the industry. The article uses variables such as the time to reach the peak number of firms, the number of firms at the peak, and the number of firms at the end of the simulation period to represent the shape of the industry distribution. The experiments show that the initial number of firms, demand elasticity, machine life, and financial resources have the most significant effects on the distribution shape, while other factors such as economic growth also have some nonlinear effects. Manuscript profile -
Open Access Article
300 - Feasibility Investigation of Hydroforming of Dental Drill Body by FEM Simulation
Mohammad Sajjad Mahdieh Mohammad Reza Esteki -
Open Access Article
301 - Numerical Study of Effective Parameters in the Deep Drawing Process of a Cylindrical Cup and Comparison with Experimental Results
Hamidreza Gharehchahi Mohammad Javad Kazemzadeh-Parsi Ahmad Afsari Mehrdad Mohammadi -
Open Access Article
302 - Simulation of Drug Release in a Polymer Screw
Amirhossein Badami Sayed Hasan Mirtalaie -
Open Access Article
303 - Production Optimization on the Flow Shop Scheduling Problem: A Simulation Study
Farshid Salehi Seyed Mojtaba Sajadi Mohammad Mehdi Karami -
Open Access Article
304 - Effects of Colliding Particle Size and Velocity on Mechanical Properties of AZ31 after Surface Mechanical Attrition Treatment: Molecular Dynamics Simulation
Ali Kazemi Ali Heidari Kamran Amini Farshid Aghadavoudi Mohsen Loh-Mousavi -
Open Access Article
305 - CAD Model and Finite Element Analysis of a Knee Brace for General Applications
Shayan Babaeifard Mohammad Saadat Amirhossein Badami -
Open Access Article
306 - A Comparison of Job-shop and Group Technology Using Simulation by ARENA
Siyavash Khaledan Hadi Shirouyehzad -
Open Access Article
307 - Numerical and Experimental Study of Geometrical Dimensions on Laser-TIG Hybrid Welding of Stainless Steel 1.4418
Mahmoud Moradi Majid Ghoreishi Azam Rahmani -
Open Access Article
308 - Numerical Simulation of the Effect of Elastic Deformation of work rolls on the rolling force and Comparison with the Results obtained by the Slab Method during the reciprocating cold rolling
Mohammad Heydari Vini -
Open Access Article
309 - Design and Fabrication of a Longitudinal-Torsional Ultrasonic Transducer
Yahya Radi Najafabadi Reza Nosouhi Frahad Sajajid -
Open Access Article
310 - A Study on the Forming of Sheet Metal Parts Using Multi-Point Forming Technology
Vahid Rikhtehgar Nezami Behrooz Zareh Abbas Vafaee Sefat -
Open Access Article
311 - Simulation of a Microgripper with Electrothermal Actuator Using COMSOL Software Based on the Finite Element Method
Amin Rouhani Esfahani Mojtaba Kolahdouzan Mehran Moradi -
Open Access Article
312 - A Comparison of Job-Shop and Group Technology Using Simulation by ARENA
Siyavash Khaledan Hadi Shirouyehzad -
Open Access Article
313 - Presenting a New Approach in Simulation and Analysis of Shoulder Error on Radar Antenna Beam of Space-Based Artificial Aperture
Mehdi Shamekh Roozbeh Hamzehyan Najmeh Cheraghi Shirazi Abdolrasul GhasemiSince most space-based synthetic aperture radar systems have an accuracy of less than one meter in the resolution of images, very accurate processing of synthetic aperture radar data to produce images with high-resolution accuracy is of particular importance. In this ar MoreSince most space-based synthetic aperture radar systems have an accuracy of less than one meter in the resolution of images, very accurate processing of synthetic aperture radar data to produce images with high-resolution accuracy is of particular importance. In this article, methods for actual modeling and simulation of the space-based synthetic aperture radar system are presented and the raw data were obtained. For simulation and modeling, the main characteristics of the real satellite synthetic aperture radar system related to sensor mode/dynamics, target observation, antenna beam patterns, pointing errors on the antenna beam, and raw data generation are reflected. Analyzes based on simulations show the effectiveness of the presented methods. In the simulation, the presented method compensates for the phase errors induced by the aiming errors of the antenna beam. The results of the centralization of raw data, the calculated value of the resolution accuracy of the slant range is equal to 1.89 meters. Also, the average values of the measured slant range resolution accuracy, peak side-lobe ratio (PSLR), and integrated side-lobe ratio (ISLR) for the Interrogation Rate Frequency (IRF). An unweighted point in the focused image was obtained around 1.94 m, 13.57 dB and -10.26 dB respectively. The calculated value of azimuth resolution accuracy is 2.24 meters and the average values of measured azimuth resolution accuracy, PSLR, and ISLR for unweighted point target IRFs are 2.29 meters, -12.57 dB and -9.68 dB, respectively. These results show the effectiveness of the proposed method. In other words, the performance of space-based synthetic aperture radar image formation using the proposed method for raw data is very good, so the various effects induced by the real synthetic aperture radar sensor are reflected. Therefore, these results confirm the proposed methods for forming the space-based synthetic aperture radar image. Manuscript profile -
Open Access Article
314 - Designing a Two-Phase BLDC Motor and Finite-Element Analysis of Stator Slots Structure Effects on the Motor Operation
Mehrdad Jafarboland Abdolamir NekoobinDesigning a two-phase brushless direct current motor (BLDC) and analyzing effects of stator slots structure on the motor operation are main objectives of this paper. At first BLDC motor with three different structures for stator slots is designed by using RMxprt softwar MoreDesigning a two-phase brushless direct current motor (BLDC) and analyzing effects of stator slots structure on the motor operation are main objectives of this paper. At first BLDC motor with three different structures for stator slots is designed by using RMxprt software and efficiency of BLDC motor for different structures in full-load condition has been presented, then the BLDC motor in different conditions by using Maxwell 3D software is designed and with finite element method is analyzed electromagnetically. The results of simulations show that by varying stator slots structure efficieny and operation of motor have changed significantly therefore with correct choosing of stator slots structure intersted operation can be found. Manuscript profile -
Open Access Article
315 - Improving the Drive System of Permanent Magnet Linear Synchronous Motor Based on Direct Thrust Force Control Applying Space Vector Modulation
Mehdi Manoochehri Javad Faiz Ghazanfar ShahgholianApplying the direct thrust force control (DFC) method in permanent magnet linear synchronous motor (PMLSM) leads to some important problems. The most important disadvantages of applying this method are electromagnetic force and linkage flux big ripple and variable switc MoreApplying the direct thrust force control (DFC) method in permanent magnet linear synchronous motor (PMLSM) leads to some important problems. The most important disadvantages of applying this method are electromagnetic force and linkage flux big ripple and variable switching frequency. In this paper space vector modulation (SVM) technique is applied for removing the disadvantages of classic DFC method. SVM technique makes the switching frequency constant and provides continues Voltage space compared with discrete space in classic method. Simulation results confirmed the theory. They show that combining the DFC method with SVM technique removes lots of the disadvantages of classic DFC method like big ripples and variable switching and remains the benefits of this method. Manuscript profile -
Open Access Article
316 - Modeling and Simulation of the Single Phase Voltage Source UPS Inverter With Fourth Order Output Filter
Javad Faiz Ghazanfar Shahgholian Mehdi EhsanA UPS inverter operates in wide load impedance ranges from resistive to capacitive or inductive load. At the same time, fast transient load response, good load regulation and good switching frequency suppression is required. The variation of the load impedance changes t MoreA UPS inverter operates in wide load impedance ranges from resistive to capacitive or inductive load. At the same time, fast transient load response, good load regulation and good switching frequency suppression is required. The variation of the load impedance changes the filter transfer characteristic and thus the output voltage value. In this paper, an analysis and simulation of the single phase voltage source uninterruptible power supply (UPS) with fourth order filter (multiple-filter) in output inverter, based on the state space averaging and small signal linearization technique, is proposed. The simulation results show the high quality sinusoidal output voltage at different loads, with THD less than %5. Manuscript profile -
Open Access Article
317 - In-silico Analysis of Chemical Interaction Space Governed by Diclofenac Sodium and Las Quorum Sensing Receptors in Pseudomonas aeruginosa
S. Shirin ShahangianMost of the pathogenic characteristics of Pseudomonas aeruginosa, a very well-known opportunist gram-negative bacteria, are modulated by its quorum sensing systems. Therefore, blocking quorum sensing pathways can be used as a strategy to confront P. aeruginosa. Non-ster MoreMost of the pathogenic characteristics of Pseudomonas aeruginosa, a very well-known opportunist gram-negative bacteria, are modulated by its quorum sensing systems. Therefore, blocking quorum sensing pathways can be used as a strategy to confront P. aeruginosa. Non-steroidal anti-inflammatory drugs are among the most popular chemicals used as therapeutics against microbial infections. The chemical interaction space of diclofenac sodium, a well-known non-steroidal anti-inflammatory drug, has been investigated herein against two major receptors (LasI and LasR) involved in the quorum sensing system of P. aeruginosa. Optimized structures of ligands and receptors were subjected to molecular docking simulations, applying the AutoDock Vina plugin available in PyRx software. Results obtained from docking and non-covalent interaction space analyses revealed suitable binding energies against both LasI and LasR receptors. However, the binding energy of diclofenac sodium was more negative for LasR, showing its higher affinity for the LasR receptor. Finally, based on our results, it is suggested that diclofenac sodium has a good potential to bind both LasI and LasR receptors. This, in turn, can followed by the downregulation of some virulence factors genes. Therefore, diclofenac sodium can be considered a potent inhibitor of quorum sensing in P. aeruginosa. Manuscript profile -
Open Access Article
318 - Simulation and nonlinear analysis behavior of seismic gusset plates connection bracing
mojtabe gorji Ahmad maleki mehdi yosefvand In this study, to simulate the behavior gusset plate connection of bracing under cyclic loading is investigated. For this purpose to model and simulated the behavior of ABAQUS software is used gusset plate connection. In modeling the nonlinear s More In this study, to simulate the behavior gusset plate connection of bracing under cyclic loading is investigated. For this purpose to model and simulated the behavior of ABAQUS software is used gusset plate connection. In modeling the nonlinear static analysis, nonlinear materials and geometry, boundary conditions flexible and cyclic loading of used and finally the model is validated by the results of experimental models. This paper shows that cyclic behavior of the gusset plate connection can be well predicted by the finite element method. The simulation results and analysis as well as the ability to model the behavior of nonlinear seismic is capable connection plate. It can also gusset plate connection buckling in the pressure modeling and predict. Manuscript profile -
Open Access Article
319 - The effect of interactive simulation on learning mathematics and creativity of fourth grade students in Alborz province
Parichehr Alipour Ahar sousan Baleghizadeh shayesteh hashemiolyaThe aim of this study was to investigate the effect of interactive simulation on learning mathematics and creativity of fourth grade elementary students in Alborz province.The research method was quasi-experimental with pre-test design, post-test with control group. By MoreThe aim of this study was to investigate the effect of interactive simulation on learning mathematics and creativity of fourth grade elementary students in Alborz province.The research method was quasi-experimental with pre-test design, post-test with control group. By multi-stage multi-stage cluster sampling of 60 people in two groups of 30 girls and boys in two groups of control (training with Shad program and WhatsApp) and experiments (training with interactive simulation PhET) were selected. Before the training, both groups underwent a pre-test and after the training, a post-test was performed for both groups Data collection tools were used to measure math lesson learning, researcher-made test ,"Children's Creativity Questionnaire" were used to measure creativity. The reliability of the math test was 0.716 with Kuder Richardson method and the reliability of the Creativity Questionnaire was Cronbach's alpha with 0.826. Two-way analysis of covariance was used for statistical analysis. The results showed education with interactive simulation had a significant effect on the learning rate of mathematics and creativity of fourth grade elementary students compared to education with a Shad program and WhatsApp. Also, the average scores of learning mathematics as well as creativity in the post-test stage are higher among male students than female. Manuscript profile -
Open Access Article
320 - On the Effect of Multimedia and Simulated Environment of Stock Exchange Education on Students Learning
Aref Hashemi Hossein Mahdizadeh Yassan Allah Poorashraf Maryam AziziThis study aimed to investigate the impact of multimedia and simulated environment of training of stock exchange and foreign currency, compared with current methods (lectures, booklets, power point presentation), on students learning at the University of Ilam. The popul MoreThis study aimed to investigate the impact of multimedia and simulated environment of training of stock exchange and foreign currency, compared with current methods (lectures, booklets, power point presentation), on students learning at the University of Ilam. The population of the study was undergraduate students in business management, economics and accounting at the University of Ilam. Using random sampling method, 184 of them were chosen as the sample. The data collection tool was a researcher-made questionnaire whose validity was confirmed by the experts. Its reliability based on Cronbach alpha Coefficient was estimated 0.734. The data from the survey were analyzed using Mann Whitney U test and those from the semi-experimental were analyzed by covariance analysis and t-test. The results suggested a significant difference between mean scores of the two groups in that the experimental group was more effective than the control group. In addition, students from the experimental group were more satisfied with the simulated environment and estimated their learning as qualified. Manuscript profile -
Open Access Article
321 - The Effect of Educational Simulator Software’s on Learning and Remembering in University Students and Comparing it with Traditional Teaching Methods
Abolfazl Lakdashti Reza Yousefi Khadigeh KhatiriSince the main goal of educational technology is to facilitate and improve learning performance, educational simulators can be used to achieve this goal. In this paper, the degree of effectiveness of the simulator software (a case study on Opnet, PSpice, Paket trace, an MoreSince the main goal of educational technology is to facilitate and improve learning performance, educational simulators can be used to achieve this goal. In this paper, the degree of effectiveness of the simulator software (a case study on Opnet, PSpice, Paket trace, and MatLab) on the learning and remembering in engineering students of non- profit Universities in Sari (2009-2010) and comparing it with traditional teaching methods was taken into consideration. The research method was a semi-experimental one with two groups of students in which posttest and pretest were used. The population was divided into experimental and control groups, the former was taught using simulator software and the latter using traditional methods. To gather data, a questionnaire was used. Research findings were analyzed through SPSS software, descriptive statistical methods such as frequency tables, percentage, mean and inferential statistical methods such as t test. The results confirmed that there was a meaningful difference between learning and remembering in teaching through educational simulators and teaching through traditional methods. In other words, education simulators had increasing and desirable effect on students learning and remembering. Manuscript profile -
Open Access Article
322 - برنامه ریزی بهینه واحد تعهد با توجه به عدم قطعیت باد با استفاده از الگوریتم جستجو فاخته
Saniya Maghsudlu sirus mohammadiدر این مقاله، یک روش جدید برای بررسی نقش واحدهای باد به عنوان یک تولید کننده انرژی در برنامه ریزی مشکل تعهد واحد ارائه شده است. امروزه، منابع انرژی تجدید پذیر به علت عدم آلودگی محیط زیست، و در نتیجه هزینه های حاشیه ای بسیار کم، در سیستم قدرت خیلی مورد توجه قرار گر Moreدر این مقاله، یک روش جدید برای بررسی نقش واحدهای باد به عنوان یک تولید کننده انرژی در برنامه ریزی مشکل تعهد واحد ارائه شده است. امروزه، منابع انرژی تجدید پذیر به علت عدم آلودگی محیط زیست، و در نتیجه هزینه های حاشیه ای بسیار کم، در سیستم قدرت خیلی مورد توجه قرار گرفتند. اما این منابع با عدم اطمینان همراه هستند، حل مشکل تعهد واحد به عنوان یک بهینه سازی سیستم برنامه قدرت سنتی مطرح شده است که تلاش میکند با تعیین واحد های ورود و خروج مطلوب و تولید بهینه در هر واحد کل هزینه تولید را به حداقل رساند. سپس، در این مطالعه با استفاده از یک الگوریتم تکرار شونده به طور تصادفی با تخصیص توابع چگالی متناسب با سرعت باد، عدم اطمینان از واحد باد تولید شده است در برنامه تعهد واحد . تجزیه و تحلیل UC با نیروی باد به منظور به حداقل رساندن هزینه کل سیستم انجام می شود. در این مقاله برای رسیدن به راه حل بهینه، یک الگوریتم جستجوکاکو فرا ابتکاری (CS) با سرعت همگرایی بالا استفاده می شود تا مشکل تعهد واحد با توجه IEEE سیستم تست 10 واحد استاندارد را حل کند. نتایج شبیه سازی کارآمدی روش پیشنهادی را برای کاهش هزینه های تولید و بهبود سودها نشان میدهد. Manuscript profile -
Open Access Article
323 - A NONLINEAR MATHEMATICAL MODEL FOR ASTHMA: EFFECT OF ENVIRONMENTAL POLLUTION
NARESHA RAM Agraj Tripathi -
Open Access Article
324 - مقایسه صحت ارزش های پیش بینی ژنومی درتراکم های مارکری و جمعیت های مرجع مختلف با استفاده از مدل BLUP برپایه اطلاعات شجره ای و ژنومی
ش. برجسته غ.ر. داشاب م. رکوعی م.م. شریعتی م. وفای والهبرای استفاده موفقیت­ آمیز از انتخاب ژنومی، تراکم مارکری و ساختار جمعیت مرجع بسیار تأثیرگذار خواهد بود. تحقیق حاضر به ­منظور مقایسه صحت پیش ­بینی ارزش­ های اصلاحی ژنومیکی در تراکم ­های مختلف نشانگری شامل پائین (K5)، متوسط (K50) و بالا (K777) در جمعیت Moreبرای استفاده موفقیت­ آمیز از انتخاب ژنومی، تراکم مارکری و ساختار جمعیت مرجع بسیار تأثیرگذار خواهد بود. تحقیق حاضر به ­منظور مقایسه صحت پیش ­بینی ارزش­ های اصلاحی ژنومیکی در تراکم ­های مختلف نشانگری شامل پائین (K5)، متوسط (K50) و بالا (K777) در جمعیت شبیه ­سازی شده براساس سناریوهای مختلف انتخاب جمعیت­ مرجع بود. بعد از شبیه­ سازی ساختار جمعیت پایه (تحت تأثیر جهش و رانش) و جمعیت اخیر (تحت تأثیر انتخاب)، تعداد 800 حیوان در جمعیت مرجع قرار گرفتند. سه سناریو جهت کاهش تعداد جمعیت مرجع مورد استفاده قرار گرفت که شامل: 1) 400 حیوان با بیشترین رابطه خویشاوندی با جمعیت هدف، 2) 400 حیوان با بیشتر میزان همخونی، 3) 400 حیوان انتخاب شده به صورت تصادفی. ارزش اصلاحی ژنومی افراد برای صفات با دو سطح وراثت­پذیری (0.5 و 0.25) با استفاده از بهترین پیش­ بینی نااریب خطی (BLUP) با ترکیب ­های مختلفی از اطلاعات شجره­ای و ژنومی شامل، ABLUP که تنها از ماتریس روابط شجره­ای (A) استفاده نموده، GBLUP که تنها از ماتریس روابط ژنومی (G) استفاده نموده، و BLUP|GA که از ترکیب هر دو ماتریس A و G براساس یک پارامتر وزنی (l) استفاده می ­نماید، برآورد گردید. با افزایش l مدل پیش ­بینی از GBLUP (که l برابر صفر است) به ABLUP (که l برابر یک می ­باشد) تغییر می­ نماید. نتایج نشان داده که بدون توجه به اثرات تراکم پنل، استفاده از ماتریس G (l=0) و ماتریس A (l=1) به ترتیب بیشترین و کمترین مقادیر صحت پیش ­بینی را داشتند. با مقایسه سناریوهای مختلف انتخاب جمعیت مرجع نشان داده شد که استفاده از همه افراد در جمعیت مرجع منجر به بیشترین برآورد صحت ارزش ­های اصلاحی گردید (P<0.05). در مقابل استفاده از پنل­ های با تراکم کمتر به­ طور قابل ملاحظه ­ای صحت پیش ­بینی ارزش ­های اصلاحی را کاهش دادند. انتخاب افراد با روابط خویشاوندی ژنتیکی بالاتر جمعیت مرجع با هدف به ­طور معنی­ داری کاهش صحت پیش ­بینی ژنومی به علت اندازه جمعیت مرجع کوچک را بهبود بخشید. Manuscript profile -
Open Access Article
325 - پتانسیل برنامه اصلاح نژادی ژنومی در مرغان بومی ایران
س. ابراهیم‏پورطاهر ص. علیجانی س.ع. رأفت ا.ر. شریفیگله­های بومی در کشورهای کم درآمد و در حال توسعه همچون ایران، نقش مهمی ایفا می‏کنند. توسعه انتخاب ژنومی می‏تواند یک استراتژی جدید در اصلاح نژاد مرغان بومی باشد. هدف از این مطالعه بررسی کاربرد برنامه انتخاب ژنومی در مرغان بومی ایران از لحاظ اقتصادی و از دیدگاه Moreگله­های بومی در کشورهای کم درآمد و در حال توسعه همچون ایران، نقش مهمی ایفا می‏کنند. توسعه انتخاب ژنومی می‏تواند یک استراتژی جدید در اصلاح نژاد مرغان بومی باشد. هدف از این مطالعه بررسی کاربرد برنامه انتخاب ژنومی در مرغان بومی ایران از لحاظ اقتصادی و از دیدگاه ژنتیکی بود. در این مطالعه دو سناریو شامل سناریوی مرسوم با 3360 و 3380 حیوان با یک سناریوی ژنومی با استفاده از نرم‏افزار ZPLAN+ مقایسه شد. صفات موجود در شاخص انتخاب، تعداد تخم‏ مرغ، وزن بدن، متوسط وزن تخم ‏مرغ و سن بلوغ جنسی بود. در سناریوی ژنومی اندازه جمعیت مرجع متفاوت مد نظر بودند. در این سناریو اطلاعات ژنومی خروس‏ها (800 خروس تعیین ژنوتیپ شده بود) به اطلاعات موجود در سناریوی مرسوم بر پایه متد شاخص انتخاب اضافه شدند. فاصله بین‏نسلی در همه سناریوهای مرسوم و ژنومی 5/14 ماه بود. در مقایسه سناریوها، رشد ژنتیکی و سود اقتصادی در سناریوی ژنومی با افزایش اندازه جمعیت مرجع افزایش یافت (88/126 یورو تا 45/147 یورو با 80 خروس) و (20/140 یورو تا 77/160 یورو با 60 خروس) در هر واحد حیوانی. قابلیت اعتماد شاخص انتخاب در سناریوی مرسوم در مسیر خروس‏ها 33/0 بود. قابلیت اعتماد در سناریو ژنومی با 80 خروس انتخابی برابر 61/0 تا 84/0 و در سناریوی ژنومی با 60 خروس انتخابی 66/0 تا 87/0 بود و در مقایسه با سناریوی مرسوم بالاتر بود. این مطالعه نشان داد که انتخاب ژنومی می‏تواند نرخ پیشرفت ژنتیکی را در مرغان بومی افزایش دهد. در حالیکه هزینه‏های سناریوهای ژنومی از سناریوی مرسوم بالاتر بود اما اطلاعات ژنومی دقت و رشد ژنتیکی را در صفات هدف اصلاحی افزایش داد. Manuscript profile -
Open Access Article
326 - The Comparison of Four Economical Selection Indices for Improving the Performance of Kermani Sheep under Rural Production System
N. Kargar Borzi M.S. Mokhtari -
Open Access Article
327 - Population Viability Analysis on Kurd Horse Breed
H.R. Bahmani S. Badbarin H. Amin Rasouli -
Open Access Article
328 - Investigation and Comparison of Performance of Modern Intelligent tTechniques in Groundwater Nitrate Simulation
Jafar SerajiToday, due to recent drought, one of the main sources of drinking water in the country is underground resources, and also nitrate is one of the most important pollutants of groundwater resources, which has adverse effects on people's health. The present study seeks to c MoreToday, due to recent drought, one of the main sources of drinking water in the country is underground resources, and also nitrate is one of the most important pollutants of groundwater resources, which has adverse effects on people's health. The present study seeks to compare and provide an efficient and innovative technique for simulating and predicting nitrate in these resources. Therefore, three artificial neural networks (ANN) models of neuro-fuzzy inference system (ANFIS) and vector-supported vector (SVM) are compared in simulation as a data-driven tool. Simulation based on observation samples from wells in the aquifer under study for 13 years and the modeling period has been selected monthly. Estimates of model simulations include magnesium (Mg), bicarbonate (Hco3), calcium (Ca), sodium (Na). First, the heterogeneous simulation of heterogeneity is carried out on different makeup. Based on the results of the evaluation of the neo-Frazi system The correlation coefficient of R2 = 9978/0 and MS2 = 0002 have better capability and capability. Manuscript profile -
Open Access Article
329 - Simulation of Distribution and Source Determination for Groundwater Quality Pollutants (Case Study: Nobandegan Plain)
syed amir bijan elhamian gholamreza rakhshanderoo Amirhoseini JavidDue to the population growth and their agricultural needs, access to water is considered a serious crisis. The objective of this paper is to simulate groundwater resources in Nobandegan plain, Fars, as a case study, to obtain the path and intensity of groundwater flow, MoreDue to the population growth and their agricultural needs, access to water is considered a serious crisis. The objective of this paper is to simulate groundwater resources in Nobandegan plain, Fars, as a case study, to obtain the path and intensity of groundwater flow, and to determine the distribution and origin of groundwater quality pollutants using GMS software. First, groundwater flow hydraulics in the plain has been simulated, calibrated and validated. Then, having the intensity and direction of groundwater flow in the plain and its interaction with adjacent aquifers, the distribution of qualitative pollutants has been investigated and simulated. Finally, combining groundwater quality and quantity information, possible origin of pollutants in the plain has been investigated and determined. Maximum values for groundwater hardness and salinity in the plain were 1272 (mg / l.CaCO3) and 3178 (µ mho / cm), respectively, which are relatively high and indicate low groundwater quality in the plain. However, pollutant levels decreased in the central areas of the plain where the aquifer thickness increases and some dilution takes place. Groundwater quality is saline in terms of salinity and very hard in terms of hardness. Investigating land use over the plain shows that the possible origins of groundwater pollution are dense agricultural activities in the northern areas, and location of Nobandegan city and villages there. Pollutants concentration in central plain decreased, apparently due to the lack of any city, village, or agricultural activity, in addition to aquifer thickness increase there. Manuscript profile -
Open Access Article
330 - Simulation and Optimization Models for Flood Control by Genetic Algorithm: Application to Karkheh Dam
FARHAD SALEHI Mosen Najarch Mohammad Mehdi Najafizade Mohammad MirhossineThe paper demonstrates a simulation-optimization framework for enhancing the real-time flood control with gated spillways at places where no flood forecasting data is available. A multi-objective modeling scheme is presented for flood management in a gated spillway in w MoreThe paper demonstrates a simulation-optimization framework for enhancing the real-time flood control with gated spillways at places where no flood forecasting data is available. A multi-objective modeling scheme is presented for flood management in a gated spillway in which the operator may specify the priorities on floods based on their different return periods. Two different operation strategies are devised. Both of the operating strategies employ ten-stage policies, which mainly rely on the reservoir water level as the input data. The second strategy benefits from both observed reservoir water level and flood peak. The optimal values of the models parameters are obtained using genetic algorithm. This is a novel approach because none of its policies needs flood forecasting data, thus, making them adaptable to any flood with any return period. To evaluate the performances of the proposed models, the flood control through gated spillway of Karkheh reservoir is considered where flood hydrographs with different return periods are routed through the reservoir. Manuscript profile -
Open Access Article
331 - Simulation of Laminar Flow in Small Channels of Emitters Using FLOW3D Software
Hojatollah Saghi Mahdi Delghandi Saeed BroomandnasabEmitter is the key component in drip irrigation system. Therefore Hydraulic performance of the emitter is an important factor affecting the capability of drip irrigation. Because of small size and complex structure of labyrinth-channel used in most drip emitters, it is MoreEmitter is the key component in drip irrigation system. Therefore Hydraulic performance of the emitter is an important factor affecting the capability of drip irrigation. Because of small size and complex structure of labyrinth-channel used in most drip emitters, it is not possible to observe the flow behavior of water passing through the channel. Also Process production of emitters is time-consuming and expensive. Therefore In this study, the flow in emitters' channels was simulated by FLOW3D software. For this purpose 3 types emitter (A, B and C) were selected and sizes of their channels were calculated by photographing with Scanning Electronic Microscope (SEM). To calculate the relationship between pressure and rate of emitters discharge, laminar model was used. Simulated results were compared with experimental results. Average of prediction error percentage (Er) was about 2 percent for A and B emitters and about 12 percent for C emitter. Hence simulated data showed a good agreement with the experimental data. Manuscript profile -
Open Access Article
332 - A New Design for Two-input XOR Gate in Quantum-dot Cellular Automata
Hossein Khademolhosseini Yaser Nemati -
Open Access Article
333 - Presenting a Hybrid Method to Increase Lifetime of Wireless Sensor Networks Using Effective Determination of Operating Mode of Sensors in Regional Coverage
Javad Aramideh Homayun Motameni -
Open Access Article
334 - A Utility-Based Data Replication Algorithm in Large Scale Data Grids
Najme Mansouri -
Open Access Article
335 - MAC Protocols in Underwater Wireless Sensor Networks: Issues and Simulations
Reza Mohammadi Seyyed Yahya Nabavi Reza Javidan -
Open Access Article
336 - کاربرد مدل پایلوت برای بهبود بهره وری آب برنج در رشت، شمال ایران
Maryam Shadpour Mohammadreza Khaledian MohammadHassan Biglouei Mojtaba Rezaeiبه­منظور واسنجی و اعتبارسنجی مدل پایلوت برای برنج در اقلیم مرطوب، مطالعه حاضر در قالب بلوک کامل تصادفی با سه تکرار روی رقم متداول محلی هاشمی در سال­های زراعی 2001، 2002، 2005، 2006 و 2007 انجام شد. پژوهش حاضر در موسسه تحقیقات برنج کشور در رشت انجام شد. مقایسه مق Moreبه­منظور واسنجی و اعتبارسنجی مدل پایلوت برای برنج در اقلیم مرطوب، مطالعه حاضر در قالب بلوک کامل تصادفی با سه تکرار روی رقم متداول محلی هاشمی در سال­های زراعی 2001، 2002، 2005، 2006 و 2007 انجام شد. پژوهش حاضر در موسسه تحقیقات برنج کشور در رشت انجام شد. مقایسه مقادیر اندازه­گیری شده و شبیه­سازی شده عملکرد دانه و ماده خشک براساس آماره­های کارآیی نش-ساتکلیف، ریشه میانگین مربعات خطا و ریشه میانگین مربعات خطای نرمال شده انجام شد. نتایج نشان داد که ریشه میانگین مربعات خطا برای مراحل واسنجی و اعتبارسنجی به­ترتیب 69/0 و 72/0 تن در هکتار بود. ریشه میانگین مربعات خطای نرمال شده برای مراحل واسنجی و اعتبارسنجی به­ترتیب 5/9 و 1/14 درصد بود. ریشه میانگین مربعات خطای نرمال شده برای عملکرد دانه و ماده خشک به­ترتیب 74/8 و 37/13 درصد بود. مقادیر آماره کارآیی نش-ساتکلیف بین 84/0 تا 98/0 بود. نتایج نشان داد که مدل پایلوت می­تواند برای مدیریت صحیح آب در رژیم­های مختلف آبیاری برنج به­کار رود. تجزیه و تحلیل سناریوهای مختلف مدیریتی نشان داد که بهترین رژیم آبیاری، رژیم آبیاری تناوبی با دور آبیاری هشت روز می­باشد. Manuscript profile -
Open Access Article
337 - شبیه سازی و مدیریت یکپارچه منابع آب تحت سناریوی آب مجازی مطالعه موردی: حوضه هیرمند ایران
علی سردار شهرکی جواد شهرکی سید آرمان هاشمی منفردحوضه هیرمند به دلیل وجود خشکسالی، هم­چنین رشد روز افزون مصارف آب و رقابت بخش­های مختلف، وارد مرحله بحرانی آب شده است، این خطر در سال­های آتی تشدیدتر خواهد شد. بنابراین برای مقابله با آن می بایست نسبت به انواع مصرف آب با حساسیت بیشتری برخورد کرد. از جمله این Moreحوضه هیرمند به دلیل وجود خشکسالی، هم­چنین رشد روز افزون مصارف آب و رقابت بخش­های مختلف، وارد مرحله بحرانی آب شده است، این خطر در سال­های آتی تشدیدتر خواهد شد. بنابراین برای مقابله با آن می بایست نسبت به انواع مصرف آب با حساسیت بیشتری برخورد کرد. از جمله این مصارف، آب مجازی می­باشد. در پژوهش حاضر، تقاضای آب مجازی محصولات کشاورزی منطقه سیستان در سال زراعی 93-1392 محاسبه و با استفاده از مدل WEAP اثرات اجرای این سناریو از سال 2015 تا 2030 بر منابع و مصارف آب پیش­بینی گردید. طبق نتایج محصولات گوجه­فرنگی و یونجه با این­که نیازآبی بالایی داشتند، اما به سبب عملکرد بالای تولید، تقاضای آب مجازی کمتری داشته­اند، هم­چنین بیشترین نیاز آب مجازی برای دو محصول گندم و جو بدست آمد. نتایج مدل WEAP نشان داد که در سناریوی آب مجازی، سالیانه به طور میانگین مقدار تقاضای آب 61 درصد برای کارایی خالص و 17 درصد برای کارایی به حالت فعلی کمتر شده است. تقاضای تأمین نشده حدود 383 میلیون متر مکعب کاهش خواهد یافت. بنابراین با توجه به شرایط خشکسالی حاکم بر منطقه، اجرای این سناریو در جهت حفظ منابع آب بسیار مناسب خواهد بود، از این­رو پیشنهاد می شود که طرح­های توسعه کشاورزی در منطقه سیستان با توجه به این مفهوم آب مجازی، برنامه­ریزی و سرمایه­گذاری شوند. Manuscript profile -
Open Access Article
338 - Effective methods to reduce the pit wall displacement (Case study: Pars complex project)
Masoumeh Mehrabi Ali Uromeihy -
Open Access Article
339 - Application of verification in groundwater flow simulation using PMWIN and MODFLOW computer codes (A case study of Behbehan plain aquifer modeling)
نصرالله کلانتری حمیدرضا ماجدی -
Open Access Article
340 - Evaluating Factors Affecting Project Success: An Agile Approach
Mohammad Sheikhalishahi Mohammad Amin Amani Ayria Behdinian -
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341 - The role of web-based systems in improving business processes using simulation approach (Case study: Credit card)
Asghar Ataee Ghortolmesh Abbas Toloie Eshlaghy Alireza Pourebrahimi -
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342 - Application on concurrent product design and process planning for a Bicycle design
Abbas Al-Refaie -
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343 - Distribution network design under demand uncertainty using genetic algorithm and Monte Carlo simulation approach: a case study in pharmaceutical industry
Arman Izadi Ali mohammad Kimiagari -
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344 - Distribution network design under demand uncertainty using genetic algorithm and Monte Carlo simulation approach: a case study in pharmaceutical industry
Arman Izadi Ali Mohammad Kimiagari -
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345 - New scheduling rules for a dynamic flexible flow line problem with sequence-dependent setup times
Hamidreza Kia Seyed Hassan Ghodsypour Hamid Davoudpour -
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346 - Determining production level under uncertainty using fuzzy simulation and bootstrap technique, a case study
Mohammadreza Hamidi Kamran Shahanaghi Armin Jabbarzadeh Ehsan Jahani Zahra Pousti -
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347 - Constrained consumable resource allocation in alternative stochastic networks via multi-objective decision making
Seyed Saeid Hashemin Seyed Mohammad Taghi Fatemi Ghomi -
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348 - Reliability analysis of repairable systems using system dynamics modeling and simulation
M. Srinivasa Rao V. N. A. Naikan -
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349 - Periodic flexible maintenance planning in a single-machine production environment
Mehdi Iranpoor S. M. T. Fatemi Ghomi -
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350 - Assembly line performance and modeling
Arun B. Rane Vivek K. Sunnapwar -
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351 - Evaluation of trade and production policy in Iranian SME (a system dynamics model)
Farzad Haghighi‑Rad Ramin Ghadimi Farshad Goldoust -
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352 - Optimal design of supply chain network under uncertainty environment using hybrid analytical and simulation modeling approach
N. Chiadamrong V. Piyathanavong -
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353 - Quantitative risk management in gas injection project: a case study from Oman oil and gas industry
Mohammad Miftaur Rahman Khan Khadem Sujan Piya Ahm Shamsuzzoha -
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354 - Adaptive policy of buffer allocation and preventive maintenance actions in unreliable production lines
Paolo Renna -
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355 - Development of simulation model for performance evaluation of feed water system in a typical thermal power plant
S Gupta P.C Tewari A.K Sharma -
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356 - Assembly line balancing to minimize balancing loss and system loss
D Roy D Khan -
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357 - A hybrid method to find cumulative distribution function of completion time of GERT networks
S.S Hashemin S.M.T Fatemi Ghomi -
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358 - Study on implementation of one-piece lean line design using simulation techniques: A practical approach
V Ramesh K.V Sreenivasa Prasad T.R Srinivas -
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359 - A new approach for constraining failure probability of a critical deteriorating system Yard crane scheduling in port container terminals using genetic algorithm
H Babaei K Shahanaghi A Bakhsha -
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360 - Flexible resource management and its effect on project cost and duration
Desta A. Hailemariam Xiaojun Shan Sung H. Chung Mohammad T. Khasawneh William Lukesh Angela Park Adam Rose Denis C . Pinha Rashpal S. Ahluwalia -
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361 - Emergency department resource optimisation for improved performance: a review
Kazi Badrul Ahsan M. R. Alam Doug Gordon Morel M. A . Karim -
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362 - Failure Probability of Damaged RC Frame under Fire Using Markov Chain.
MohammadJavad Goodarzi Hamidreza Tavakoli syyed milad hasheminejad alireza mohseni saravi majid moradi -
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363 - Numerical investigation of a new structural configuration of a concrete barrier wall under the effect of blast loads
Ahmed K. Taha Zhengguo Gao Dahai Huang M. S. Zahran -
Open Access Article
364 - Application of nanofluids for heat transfer enhancement in solar water heaters
محمد رضا جعفری نصر سیده فاطمه حسینیIn this study, techniques for heat transfer enhancement reviewed. Application of nanofluids was studied as a new technique for more energy saving and heat recovery. Transys version17 simulation was used for prediction of thermal efficiency of water and various nanofluid MoreIn this study, techniques for heat transfer enhancement reviewed. Application of nanofluids was studied as a new technique for more energy saving and heat recovery. Transys version17 simulation was used for prediction of thermal efficiency of water and various nanofluids in a flat plate solar collector. Nano fluids that were used in this simulation analysis are copper oxide, copper, and alumina. The results show that the heat transfer and thermal efficiency of copper nanofluid are greater than other working fluids while the exergy efficiency of alumina is greater. Gambit 2.4.6 was used for our CFD calculation along with the Fluent version17.2. We used a model to numerically simulate the heat transfer. The governing equations and corresponding boundary conditions are converted to dimensionless forms and solved numerically by the finite element method. The results show that efficiency of copper is 67% and it is greater than alumina and copper oxide efficiency. Manuscript profile -
Open Access Article
365 - Simulation of increasing of light olefins production yield from methanol using HZSM-5 zeolite catalysis
محمد رستمی زاده پیمان تقوی حسین حضرتیLight olefins (ethylene, propylene, and butylene) can be produced from methanol through non-oil route. In this study, HZSM-5 catalyst was synthesized by hydrothermal method and characterized using X-ray diffraction (XRD), Field emission scanning electron microscopy (FE- MoreLight olefins (ethylene, propylene, and butylene) can be produced from methanol through non-oil route. In this study, HZSM-5 catalyst was synthesized by hydrothermal method and characterized using X-ray diffraction (XRD), Field emission scanning electron microscopy (FE-SEM), N2 adsorption-desorption (BET), Fourier transform infrared spectroscopy (FT-IR), and NH3 temperature programmed desorption (NH3-TPD) analysis. The catalysis included microsphere morphology which led to mesoporous structure formation and acceleration of diffusion. Based on characterization, the catalysis represented high crystallinity, high surface area and appropriate acidity properties. The results showed that the catalysis provided high methanol conversion (99.5%), selectivity of light olefins (82%), and long-term catalytic lifetime (72h). In order to increase the production yield, suitable reaction groups and kinetics in consistent with the catalysis performance was determined and methanol to olefin (MTO) process was simulated. The simulation results showed well agreement with the experimental data. Optimization of kinetic and operational parameters of MTO resulted in high methanol conversion and light olefins selectivity as 100 % and 94.1 %, respectively. The catalysis performance in the MTO process under the optimized operational conditions was confirmed the simulation results which indicated practicality of applied simulation and optimization Manuscript profile -
Open Access Article
366 - optimal model sales in gold ounce and s&p 500 markets on the basis of optimal stopping
amir mahmoudian maryam khalili araghi hamidreza vakilifardExtended Abstract Throughout history, predicting price in financial markets has always been of high interest to financial activists and analysts. Recently, various methods have been proposed and adopted to predict the dynamism of financial markets using time series o MoreExtended Abstract Throughout history, predicting price in financial markets has always been of high interest to financial activists and analysts. Recently, various methods have been proposed and adopted to predict the dynamism of financial markets using time series of records of prices. However, high-precision predication of financial prices is still a deemed long-term challenge that constantly call for state-of-the-art approaches. Purpose Thus, the purpose of the current study was to examine the efficacy of optimal stopping, also known as early stopping and use its connection with branching processes to predict the optimal buying and selling prices in several financial markets. gold ounce market and S&P 500 index have been predicted in short term and long-term frameworks on the basis of fixed horizon. And for each. frame work, different time frames have been selected. Closing price data from 1995 to 2022 have been used for every time frame. Methodology Advanced methods for optimal stopping include approximating the value function and then using that approximation in a policy. Although such policies can work very well, they are generally not guaranteed to be interpretable (Siokan and Mišić 2020). On the other hand, some researchers have proposed that the optimal stop models are too complicated to solve well and the strategies of buying at a low price and selling at a high price are not very practical in this theory (Liu and Mo 2022). According to the issues raised, the researcher intends to use the optimal stop theory and its connection with branch processes to implement and examine this theory in a number of prominent international financial markets. In this research, we are going to use the optimal stop statistical theory to predict the time of buying and selling in these markets in an optimal way. Finding The optimal stopping algorithm seeks to determine the maximum value from a set of random variables that are exhibited in the order they are generated. Each variable should either be selected when exhibited or be skipped in favor of the next variable, and if all the variables till the nth variable are skipped, this variable is selected automatically. It should be borne in mind that the theory of optimal stopping first examines the previous data and finds out whether there is a divergence, according to which it determines which market cannot be predicted based on this theory. In general, these random variables are considered as independent and co-distributed. Yet, due to the complexity of this theory, even in this case, solving problems directly proves to be very difficult, and hence the correlation between this theory and branch processes are employed to simplify solution. The steps of this process are as follows: Step 1 The analyst finds the planning horizon (20 - horizon in the present paper) Step 2 Determine the statistical distribution of values using statistical tests, including the goodness of fit, chi-square, Chebyshev's inequality, and Q-Qplot (Moud et al. 1973) Step 3 Transforming it to a normal distribution using Box-Cox Transformations (Cox-Box 1964), and converting to the standard normal distribution (minus mean value divided by standard deviation) (Moud et al. 1973) Step 4 Using inverse distribution function (using probability integral transform theorem) (Moud et al. 1973) and transforming it to considered distribution in branching process and determining convergency or divergence of data (Ross 1983; Shishebor et al. 2004) Step 5 Predicting the best point for optimal buy or sell at a determined horizon (Assaf et al. 2000) Step 6 Reversing all transforms and predicting real values (Assaf et al. 2000) Conclusion The results indicate that by optimal stopping for short term framework, S&P 500 index indicates %67 success and gold ounce shows %53 success in the prediction of prices. In long term framework, S&P 500 index's success equals to %68 and gold ounce equals to %85 in prediction of prices. The obtained results show that the optimal stop theory has performed better in predicting the gold price in the long-term time frame and the S&P 500 in the short-term time frame. The S&P 500 market and the gold market have obtained the most predictability based on the optimal stop theory. This can be confirmed by market traders because the S&P 500 and gold market are interesting markets from a technical and trading point of view. The number of transactions and high liquidity and the difference in spread and commission in these two markets compared to other markets can be indicative of this. Also, the high volatility in the two mentioned markets due to the uncertainty regarding the continuation of prices and key economic indicators presents countless opportunities to traders. According to the obtained results, the optimal stopping can be used as a trading and analytical indicator. Also, the characteristic of optimal stopping is that based on historical data, it shows the prediction as the optimal point (buying and selling price) in the future. Due to the fact that examining the financial markets both from the study and analytical point of view and from the trading point of view by using a variety of forecasting patterns and indicators requires understanding the possibilities of market behavior, choosing a time frame and having a strategy. Manuscript profile -
Open Access Article
367 - Operation of Multiple Reservoirs by utilization of Simulation Method for Analysis of System Dynamics
A Mansoori V Khatib -
Open Access Article
368 - Model study reservoir flushing
S.H Ghoreishi M.R Majdzadeh Tabatabai -
Open Access Article
369 - Modeling Lake Urmia Water-Level Changes using Local Linear Neuro-Fuzzy Method
Arash Razmkhah Seyed Reza Alvankar Abbas Kakahaji -
Open Access Article
370 - بررسی مروری بر Forging و تأثیر بر قسمت تولید شده
مریم صالح -
Open Access Article
371 - A Method for Measuring Transient Switching Overvoltage Case study: Electricity network of Imam Khomeini Airport City
Mojtaba Rabiei Seyed Mohammad Hassan Hosseini -
Open Access Article
372 - Terminal Sliding Mode Controller for Tracking a Wheeled Mobile Robot
Fahimeh Kordi Hamidreza Reza Alikhani Javad Nikoukar -
Open Access Article
373 - Alyzing the Effects of Fuel Price Reform on Electricity Industry’s Financial Balance, Employing a Simulation of the Function of the Market
jamshid Pajooyan Taymot mohammadi Ali Asghar Ismail Nia elham gaforiyan Abstract This article is devoted to the study of the impact of a reform in power plant fuel prices on the key variables of Iran's electricity market (average electricity price and the financial balance of the electricity industry). It is based on a simulation m More Abstract This article is devoted to the study of the impact of a reform in power plant fuel prices on the key variables of Iran's electricity market (average electricity price and the financial balance of the electricity industry). It is based on a simulation model. In this regard, we employed a model in which the presence or absence of competition in the electricity market is based on the amount of power plant storage factor that is available in every hour. The corresponding critical storage factor, which is based on actual operation, is also calculated. Due to a suppressed price cap and availability rate (that is even lower than what is necessary for sending optimal investment signals), the current price cap and availability rate is not a valid starting point for calculating the desired effects. Hence, before examining the effects of a price reform on the mentioned variables, the price cap and availability rates need to be adjusted to a level that can guarantee a minimum IRR for investors in this sector. According to calculations, in order to sending the necessary signals for investment, by assuming a fixed availability rate, it is necessary to increase the current price cap (nearly 417 Rials per kilowatt hour) to a new level (570 Rials per kilowatt hour). According to that, the average wholesale market price will increase from nearly 600 Rials per kilowatt hour to 706 Rials per kilowatt hour. The implementation of this policy imposes a financial burden of about 29894 billion Rials to the Ministry of Energy. Given that, in markets amid with a price cap (and hence an availability payment), a price reform in fuel price, requires a proportional modification in the market price cap. Based on this obligation, the effects of the price reform on the mentioned variables, is calculated and analyzed. The analysis is based on three different scenarios about fuel price for power plants; The price of gas used in the petrochemical industry (as a raw material for this industry), the price of gas that is exported to Turkey, and, the minimum bound foreseen in the "law on the targeting of subsidies" in relation to the price of natural gas. Implementation of the mentioned scenarios will increase the market cap from 570 Rials per kilowatt hour to 1783, 3655 and 2830 Rials per kilowatt hour respectively. Adjusted average market price, proportional to the adjustment made in the market price cap, would be equivalent to 1922, 3801 and 2973 rials per kilowatt hour respectively. Furthermore, the financial burden corresponding to these scenarios will be 61717, 156574 and 114866 billion Rials respectively. Manuscript profile -
Open Access Article
374 - Modeling of Aboveground Net Primary Production Using Topography Factors in Siahpoush and Ganjgah Rangelands of Ardabil Province, Iran
Mehdi Moameri Pashmineh Mohammadnezhad Ardavan Ghorbani Farid Dadjuo Vadood Mahammadi -
Open Access Article
375 - Simulation Model for a Nomadic Animal Production System in Southern Iran
Gh. R. Badjian Dahlan Ismail M. Sh. Othman A.A. Mehrabi -
Open Access Article
376 - Value at Risk Assessment in Tehran Stock Exchange using Non-parametric and parametric Approaches
ebrahim ghanbari memeshi seyed ali nabavi chashmi erfan memarianThe purpose of this study is to evaluate the value at risk of stock indexes based on parametric and nonparametric approaches in Tehran Stock Exchange. In this regard, the Tehran Stock Exchange (TEPIX) index was used as a representative of market portfolios and daily dat MoreThe purpose of this study is to evaluate the value at risk of stock indexes based on parametric and nonparametric approaches in Tehran Stock Exchange. In this regard, the Tehran Stock Exchange (TEPIX) index was used as a representative of market portfolios and daily data for the period 13/10/2009-12/11/2019. In this study, first, the results of estimating the value at risk using two models of exponentially weighted Moving Average (EWMA) and Monte Carlo simulation (MC) are presented. The performance tests of these models are then compared with other models including GARCH and historical simulation models. The estimation results of these models were obtained using Eviews 10 and Matlab 2018 software. The results show that the exponential moving average (EWMA) model is more efficient and more accurate than other models. The results also show that based on violation ratio and Back Tests, non-parametric models such as Monte Carlo simulation have overestimated the value at risk . Manuscript profile -
Open Access Article
377 - Optimizing AGV Colonie’s Efficiency by Fuzzy Simulation
Shabnam Ezadpanah Alireza Mohammadion Armen Adamian -
Open Access Article
378 - Adequacy studies of different renewable resources using Monte Carlo simulation method
Amir Ghaedi Reza Sedaghati Mehrdad MahmoudianProduced power of wind, solar, run of the river, ocean thermal, tidal and wave power plants is respectively, dependent on wind velocity, sun radiation, river flow, temperature of ocean upstream, period & height of waves, tidal level or tidal stream velocity. Due to wide MoreProduced power of wind, solar, run of the river, ocean thermal, tidal and wave power plants is respectively, dependent on wind velocity, sun radiation, river flow, temperature of ocean upstream, period & height of waves, tidal level or tidal stream velocity. Due to wide change in these quantities, produced power of these renewable resources changes a lot over time. As the penetration level of renewable resources in electric network is increased, reliability and other aspects of electric network may be affected that should be studied. Analytical method is not suitable to study uncertainties of output power of renewable resources in reliability analysis of electric network with these renewable power plants. Thus, the current research suggests Monte Carlo simulation method to study effect of renewable power plants on reliability indices. Renewable power plants studied in the research are wind turbines, solar farms, wave energy converters, run of the river power plants, both types of tidal units, and ocean thermal energy conversion systems. Numerical studies are performed on test electric networks, to study these renewable resources impact on reliability indices of electric networks with renewable power plants. It is concluded from numerical outcomes that these renewable power plants improve reliability performance of electric network. However, due to the variation of renewable resources, the impact of renewable power plants on reliability performance of the electric network is less than the conventional units with the same capacity. Manuscript profile -
Open Access Article
379 - Loss of Load Expectation Assessment in Deregulated Power Systems Using Monte Carlo Simulation and Intelligent Systems
H Haroonabadi M.-R Haghifam -
Open Access Article
380 - Stochastic Congestion Alleviation with a Trade-off between Demand Response Resources and Load Shedding
Abbas Tabandeh Amir Abdollahi Masoud Rashidinejad -
Open Access Article
381 - Unit Commitment in Presence of Wind Power Plants and Energy Storage
Reza Khanzadeh Mahmoud Reza Haghifam -
Open Access Article
382 - Establishment of stock portfolio based on network-based epidemic modeling in the Iranian stock market
samad sedaghati Roohollah Farhadi. Mir Feyz FallahDue to the importance of transmission in financial markets, in the present study, using network-based epidemic modeling, the Iranian stock market in the period from 2011 to 2020 has been analyzed in three scales: daily, seasonal and annual. For this purpose, the correla MoreDue to the importance of transmission in financial markets, in the present study, using network-based epidemic modeling, the Iranian stock market in the period from 2011 to 2020 has been analyzed in three scales: daily, seasonal and annual. For this purpose, the correlation network of 46 Iranian stock market groups has been constructed and by creating daily, seasonal and annual graphs and to identify the topological properties and structure of the Iranian stock market network, the minimum spanning tree has been calculated and transmission dynamics have been analyzed using simulations. The results show that in the daily period, the minimum cover tree has 13 groups on the main branch and in the seasonal period has 19 groups and in the annual period 28 groups are on the main branch of the minimum cover tree. Also, network-based epidemic modeling (with a thousand repetitions) showed that in the short term, the market spread is faster and the changes (for example, due to an information shock) spread to more groups. And almost all market groups are affected by the changes Manuscript profile -
Open Access Article
383 - A Portfolio Optimization Model for a Private Equity Investment Company under Data Insufficiency Condition with an Artificial Bee Colony Meta-heuristic Approach
Fereydoun Rahnama Roodposhti Ehsan Sadeh Mirfeiz Fallahshams reza Ehteshamrasi jamil JalilianDifferent investors with different investment levels have a goal in common which is to reach a portfolio of assets which further to meeting the expected rate of return would have the least possible level of risk. In this study we aim to help an investment company to det MoreDifferent investors with different investment levels have a goal in common which is to reach a portfolio of assets which further to meeting the expected rate of return would have the least possible level of risk. In this study we aim to help an investment company to determine an optimized combination of assets containing the stocks of its subsidiary companies as well as other lower risk assets. One of the main challenges in investing in private companies’ stocks, is the lack of data related to their return and risk compared with public companies. In this paper we apply a simulation approach which is able to generate valid random numbers in data insufficiency condition to calculate the return and the risk of the private assets. Furthermore, defining the problem as a bi-objective optimization problem and regarding the fact that portfolio selection is an NP-Hard problem, we use a multi-objective covariance-based artificial bee colony algorithm to solve our problem. The results show that efficient portfolios are the ones have both high risk and low risk assets simultaneously. Manuscript profile -
Open Access Article
384 - Volatility Clustering in financial markets based on the agent based model
zahra shirazianThe purpose of this study is to investigate the clustering of fluctuations in financial markets, including the stock market, with the underlying model of simulation.Time series of financial asset returns show the clustering of volatility, which shows that large changes MoreThe purpose of this study is to investigate the clustering of fluctuations in financial markets, including the stock market, with the underlying model of simulation.Time series of financial asset returns show the clustering of volatility, which shows that large changes in prices tend to form clusters together And these clusters will last for a long time. Time series of financial asset returns often exhibit the volatility clustering property: large changes in prices tend to cluster together, resulting in persistence of the amplitudes of price changes. After recalling various methods for quantifying and modeling this phenomenon, we discuss several economic mechanisms which have been proposed to explain the origin of this volatility clustering in terms of behavior of market participants and the news arrival process. A common feature of these models seems to be a switching between low and high activity regimes with heavy-tailed durations of regimes. Finally, we discuss a simple agent-based model which links such variations in market activity to threshold behavior of market participants and suggests a link between volatility clustering and investor inertia. Manuscript profile -
Open Access Article
385 - Volatility clustering in financial markets based on the agent based model
zahra shirazian Hashem Nikoomaram Fereydoon Rahnamay Roodposhti Taghi TORABIThe purpose of this study is to investigate the clustering of fluctuations in financial markets, including the stock market, with the underlying model of simulation. Time series of financial asset returns show the clustering of volatility, which shows that large changes MoreThe purpose of this study is to investigate the clustering of fluctuations in financial markets, including the stock market, with the underlying model of simulation. Time series of financial asset returns show the clustering of volatility, which shows that large changes in prices tend to form clusters together And these clusters will last for a long time. Time series of financial asset returns often exhibit the volatility clustering property: large changes in prices tend to cluster together, resulting in persistence of the amplitudes of price changes. After recalling various methods for quantifying and modeling this phenomenon, we discuss several economic mechanisms which have been proposed to explain the origin of this volatility clustering in terms of behavior of market participants and the news arrival process. A common feature of these models seems to be a switching between low and high activity regimes with heavy-tailed durations of regimes. Finally, we discuss a simple agent-based model which links such variations in market activity to threshold behavior of market participants and suggests a link between volatility clustering and investor inertia. Manuscript profile -
Open Access Article
386 - Selection of the optimal method in calculating the value at risk of investment fund
Ali Najafi moghadamDuring the past several years experience extraordinary explosion of collective investment organisms or of investment companies (who buys the shares of other companies), led to the agencies responsible for controlling and monitoring these investments are a The series is MoreDuring the past several years experience extraordinary explosion of collective investment organisms or of investment companies (who buys the shares of other companies), led to the agencies responsible for controlling and monitoring these investments are a The series is based on Value at Risk management guidelines apply. But the flexibility that many questions regarding the accurate and appropriate estimation model provokes. The purpose of this article Choose from three parametric method, historical simulation and Monte Carlo Simulation is the best way to predict the possible losses if the investment fund files open Tunisians find. For this purpose, different methods of estimating VaR propose. The descriptive statistical characteristics of 14 cases we analyzed combined investment fund. Then we present the results of experimental studies, so we can take advantage of Monte Carlo simulation method to predict the potential value of the company's chief of investor Tunisian specify. Manuscript profile -
Open Access Article
387 - A Simulation Based Optimization Model for Pricing Basket Options
Ehsan Hajizadeh Masoud MahootchiToday, in the famous financial markets, options and futures are very important contracts for reducing the risk of investors. Many active practitioners in the financial markets really believe that mispricing or incorrect valuation of these securities would be the main re MoreToday, in the famous financial markets, options and futures are very important contracts for reducing the risk of investors. Many active practitioners in the financial markets really believe that mispricing or incorrect valuation of these securities would be the main reason of collapse of some financial institutions. The complexity of option pricing/valuation, especially in the case of American basket options, as high dimensional options, has motivated many researchers to develop numerical and simulation-based models. In this paper, a new simulation-based approach for pricing/valuation of American basket option is proposed. Furthermore, for scenarios generation, we use a Monte Carlo simulation technique using a t-student copula-GARCH method and Extreme Value Theory to handle the nonlinearity of dependencies between variables. To verify the computational efficiency and the accuracy of the proposed methodology, we compare the results of prices obtained through the proposed models with those achieved through the Monte Carlo simulation and the method developed by Ju for European basket options. Manuscript profile -
Open Access Article
388 - Estimating the probability of Loss of Credit Portfolio using the sharp asymptotic method and Latent variable model
Mohammad reza Haddadi Reza Maaboudi Saeedeh FallahyanThe purpose of the study is to obtain a probability of a very high loss for a credit portfolio in a fixed time horizon and to calculate the loss of this portfolio in the worst possible case (the defaults of all customers). For this purpose, the Copula function approach MoreThe purpose of the study is to obtain a probability of a very high loss for a credit portfolio in a fixed time horizon and to calculate the loss of this portfolio in the worst possible case (the defaults of all customers). For this purpose, the Copula function approach is used. A Copula function is a new tool that increases the accuracy of the calculation of this probability. Gaussian Copulas cannot simulate the dependence between the members of the portfolio. For this reason, the T- Copula method has been used as an alternative model in this paper. The T-Copula pattern, in contrast to the normal Copula method, supports the extreme dependence between variables. The structure of a multivariate distribution t is the ratio of a multivariate normal distribution on the second root of a Chi-square random variable. If the denominator of the distribution chooses values close to zero, then the corresponding vector coordinates of the random variables are distributed t , Can record large joint movements. The Chi-square random variable plays "common shock" roles. The present study, using the hidden variables method, has calculated the probable unpredictability of loss for a heterogeneous portfolio of given facilities consisting of 250 borrowers. For this purpose, based on the type of borrowed loans, borrowers are divided into three groups. Using the Monte Carlo simulation method, the probability of a loss in this portfolio is estimated, then the residue levels in each group of agents and the total amount of exposure are calculated. The findings showed that, considering the degree of freedom 2 for the distribution of the student's t-test related to the vector of hidden variables, the maximum probability of loss of credit portfolio Has been 11.01. Manuscript profile -
Open Access Article
389 - Analytical Solution of Steady State Substrate Concentration of an Immobilized Enzyme Kinetics by Laplace Transform Homotopy Perturbation Method
Devipriya Ganeshan -
Open Access Article
390 - A Model of Coronavirus Pandemic Spread with Lockdown and Quarantine
Dejen Mamo -
Open Access Article
391 - Proposing A stochastic model for spread of corona virus dynamics in Nigeria
Aliyu Kinafa -
Open Access Article
392 - Stability Analysis of a Malaria Transmission Model for the Effect of Infected Immigrants with Temperature and Rainfall Dependent Parameters
Victor Yiga Hasifa Nampala Julius Tumwiine -
Open Access Article
393 - The Lindley-Lindley Distribution: Characterizations, Copula, Properties, Bayesian and Non-Bayesian Estimation
Christophe Chesneau Haitham Yousof G. Hamedani Mohamed Ibrahim -
Open Access Article
394 - Mathematical Model for the Effects of Intervention Measures on the Transmission Dynamics of Tungiasis
JAIROS SHINZEH Livingstone Luboobi -
Open Access Article
395 - Mathematical Modeling of COVID-19 Pandemic with Treatment
Abayneh Bezabih -
Open Access Article
396 - Analytical Solution of the Effect of Awareness Program by Media on the Spread of an Infectious Disease by Homotopy Perturbation Method
Devipriya Ganeshan -
Open Access Article
397 - A MODEL FOR EVOLUTIONARY DYNAMICS OF WORDS IN A LANGUAGE
A. Yadav J. Dash M. Padhee S. Bhattacharya -
Open Access Article
398 - CONSTANT STRESS ACCELERATED LIFE TESTING DESIGNWITH TYPE-II CENSORING SCHEME FOR PARETO DISTRIBUTION USING GEOMETRIC PROCESS
Mustafa Kamal -
Open Access Article
399 - COUPLING MODEL FOR MULTI-COMPONENT GAS PERMEATION PROCESS
A. Hussain A. Qayyum -
Open Access Article
400 - EFFECT OF ELECTRIC FIELD ON PD ACTIVITY AND DAMAGE INTO SOLID DIELECTRIC MATERIALS
Alireza Ganjovi -
Open Access Article
401 - SIMULATION OF TETRACYCLINE ONTO GRAPHENE NANO SHEET
Gholamreza Soliemani Ehsan Ezzatpour Ghadim Salimeh Kimiagar -
Open Access Article
402 - Performance Evaluation of FAO AquaCrop Model to Predict Maize Grain Yield and Biomass under different water regimes and fertilizer
Ebrahim Amiri Afshin KhorsandThis study was conducted for performance evaluation of AquaCrop model to predict grain yield and biomass of maize in Lahijan, Iran for two years (2010-2011). The experiment was a randomized block based on a split plot design with three replications. Irrigation treatment MoreThis study was conducted for performance evaluation of AquaCrop model to predict grain yield and biomass of maize in Lahijan, Iran for two years (2010-2011). The experiment was a randomized block based on a split plot design with three replications. Irrigation treatments as main plots were in three irrigation levels 6, 12 and 18 days, respectively. Nitrogen fertilizer treatments as sub-plots in four levels of 0, 120, 180 and 240 kg per hectare, respectively. Evaluation simulated and measured grain yield and biomass by adjusted coefficient of correlation; and by normalized root mean square errors (NRMSE). Based on results, the average normalized root mean square error of calibration and validation in grain yield prediction for the genotype (SC704), were calculated 14.74 and 12.01 percent, respectively and for biomass, were calculated 10.31 and 9.66, respectively. Also, the regression coefficient (R2) of calibration and validation for maize grain yield, were calculated 0.84 and 0.77, respectively and for maize biomass, were calculated 0.91 and 0.86, respectively. Results indicated that, the AquaCrop model predicted maize grain yield and biomass prediction with an appropriate precision. Manuscript profile -
Open Access Article
403 - Investigation of harvest index linear increase and related parameters in filling grain period of chickpea (Cicer arietinum)
jafar pourreza Afshin Soltani Abdolah BahraniQuantitative information regarding biomass partitioning in chickpea (Cicer arietinum L.) is limited or inconclusive. The objective of this study was to predict biomass partitioning to seed based on harvest index in chickpea crops grown under well-watered conditions. A f MoreQuantitative information regarding biomass partitioning in chickpea (Cicer arietinum L.) is limited or inconclusive. The objective of this study was to predict biomass partitioning to seed based on harvest index in chickpea crops grown under well-watered conditions. A field experiments, with 3 sowing dates and 4 plant densities, was conducted in Gorgan during 2004-2005. Crop biomass and phenological stages were measured between emergence and maturity. Density increase and delay in sowing date led to each phonological stages period decrease. Harvest index increased in seed filling period linearly. The effect of density on harvest index linear increase was not significant but there was different between sowing date. The time of beginning harvest index linear increase, decreased from 26 to 8 days from first sowing date to third one, but there was any difference in plant density. therefore From obtained coefficient in this research we can use in chickpea growth simulation models. Manuscript profile -
Open Access Article
404 - Optimizing Waiting Time in Urban Public Transportation System Using Simulation Approach (Case Study: Isfahan Bus Company)
Tooba JabarootianPublic transportation system plays an important role in economic growth and urban development, including reducing transportation costs and increasing efficiency. To increase the share of public transportation systems in urban travel, measures need to be taken to improve MorePublic transportation system plays an important role in economic growth and urban development, including reducing transportation costs and increasing efficiency. To increase the share of public transportation systems in urban travel, measures need to be taken to improve their management and increase their efficiency. In this regard, the most important step in planning for this area is to revise or redefine the routes of the network lines. This process is known as a strategic step in managing long-term programs for the network. Given the growing trend of urbanization in large cities and the need for reliable and efficient public transportation, optimizing and improving the performance of public transportation networks is of great importance. Efficient planning and operation of transportation systems require accurate estimation of passenger waiting times. In this article, using a queuing system, simulation and optimization of urban public transportation system have been investigated with a case study of the Isfahan Bus Company in order to reduce waiting times at bus stops. In this study, first, the current performance of Isfahan's public transportation network was examined using simulation, and then by making changes to the network and various parameters, optimal solutions for reducing waiting times were proposed. The results of the simulation of Isfahan's bus transportation system show that significant improvements in the performance of the public transportation network can be achieved by making corrective changes to the structure and scheduling of the buses. Manuscript profile -
Open Access Article
405 - The effects of plant density and nitrogen fertilizer amounts as top dressing on yield of potato at Damavand region
A. Roozbahani M. M. MirzaeiThis study was carried out in 2004 in Damavand region to evaluate the effect of plant density and nitrogen fertilizer amounts as top dressing on yield and yield components of potato (Agria cultivar) on a split plot design of the study comprised of randomized compl MoreThis study was carried out in 2004 in Damavand region to evaluate the effect of plant density and nitrogen fertilizer amounts as top dressing on yield and yield components of potato (Agria cultivar) on a split plot design of the study comprised of randomized complete blocks design with four replications. In this experiment, plant densities (7.97, 5.29 and 3.32 plant /m) and nitrogen fertilizer amounts (0, 100, 200 and 300 kg urea/ha) were levels of main plot and sub plot respectively. Characteristics such as number of tuber per plant, average tuber weight, weight of tubers per plant, tuber yield (t/ha) and dry matter percentage after harvesting were recorded and statistically analyzed. The results showed that there were significant differences between plant densities and nitrogen fertilizer levels for all traits(Duncan 1%). Means comparison showed that density of 5.29 plants per square meter and fertilizer levels (200 and 300 kg urea/ ha) from the point of view of all traits were superior to the others. Also interaction effects of plant density and nitrogen fertilizer statistically were significant for all characteristics. Manuscript profile -
Open Access Article
406 - The effects of salinity on germination of three clover species(Trifolium spp.)
N. AbdiThe effects of salinity levels of NaCl were examined on seed germination of three clover species: Trifolium pratense, T. resupinatum and T. repens. Salinity levels comprised of 0 (control), 50, 100, 150, 200, 250 and 300 milimolar NaCl. Treatments were arranged factoria MoreThe effects of salinity levels of NaCl were examined on seed germination of three clover species: Trifolium pratense, T. resupinatum and T. repens. Salinity levels comprised of 0 (control), 50, 100, 150, 200, 250 and 300 milimolar NaCl. Treatments were arranged factorial design and were compared in a Completely Randomized Design (CRD) with three replications. Results showed clover species, salinity levels and their interactions had a significant effect on germination percentage of clovers. As the level of salinity increased, seed germination decreased. In regard to salinity tolerance at germination stage,T. resupinatum was the most tolerant species and T. pratense and T. repens, were ranked as the second and third grade respectively. As the level of salinity increased,the percentage of abnormal seedling on T. resupinatum, the percentage of hard un-germinated seeds On T.pratense and the percentage of smooth un-germinated seeds on T. repens, were increased Manuscript profile -
Open Access Article
407 - Life table and reproduction parameters of Orius albidipennis Reuter on different developmental stages of Tetranychus urticae Koch
K. Eskandarli A.A. Talebi R. Vafaei Shoushtari A. HosseininiaThe predatory bug Orius albidipennis is one of the most important biological control agents of some orchard, cultivated and ornamental crop pests in Iran. Therefore, determination of its biological characteristics is important. In this research, life table and populatio MoreThe predatory bug Orius albidipennis is one of the most important biological control agents of some orchard, cultivated and ornamental crop pests in Iran. Therefore, determination of its biological characteristics is important. In this research, life table and population parameters of O. albidipennis were investigated in a growth chamber at temperature of 25±1ºC, 65± 10% relative humidity and a photoperiod of 14:10 (L:D) hours on different developmental stages of Tetranychus urticae. The experiment was carried out using 100 one day old eggs of O. albidipennis and mortality of different developmental stages was estimated daily. The results indicated that age specific mortality of O. albidipennis on different developmental stages of two-spotted spider mite was started from 4th day and increased gradually with regular fluctuations. Life expectancy was increased after emerging of nymphs and then was decreased regularly. Life expectancy was estimated 12.97 and 18.86 days in nymph and adult emerging time, respectively. The gross fecundity rate, gross fertility rate and gross hatch were determined 76.45±0.42, 60.12±2.29 and 0.79, respectively. The mean numbers of eggs per female per day was estimated 4.25 eggs. Manuscript profile -
Open Access Article
408 - The efficiency of two methods of egg's lacewing releasing with 1:5 ratio in greenhouse
Z. R. Kerahroodi B. HatamiLacewings are the predatory insects that widely used in biological control programs. Among them, Chrysoperla carnea (Stephens) (Neu.: Chrysopidae) is a promising biological control agent in releasing against pests in greenhouses and fields. In this study, two release me MoreLacewings are the predatory insects that widely used in biological control programs. Among them, Chrysoperla carnea (Stephens) (Neu.: Chrysopidae) is a promising biological control agent in releasing against pests in greenhouses and fields. In this study, two release methods of lacewing’s eggs were compared: distribution of eggs mixed with sawdust as an egg carrier and dispensation of the eggs using chrysobag (the special net bags). Experiments were conducted on the cucumber Cucumis sativum L., against cotton aphid, Aphis gossypii Glover in netted cages. Ratio 1:5 was compared in two methods in a condition that each cage contained 4 plants and density of aphids was higher than that of the last experiments. This experiment was conducted in a randomized complete block design. First egg release showed no significant difference between two methods. Approximately 80-84% reduction in population density of aphids was observed compared with control treatment. However 2nd egg release, 7 days after 1st release, showed 94-95% reduction in aphid population. Better control of aphids was observed with repeated egg release. If experiments conducted in cage without presence of generalist predators (such as ants) of eggs, two methods had the same effect to control aphids. Although two methods had the same efficacy without presence of ant, if eggs released in greenhouses and fields, chrysobag protects eggs from ants and other predators. Therefore, chrysobag with a high efficiency and without bad affect on host plant. Chrysobag method suggested to be used in commercial greenhouses and field Manuscript profile -
Open Access Article
409 - Connecting rods, fatigue analysis of universal tractor via finite element method by using ANSYS
S. A. Mireei M. Omid A. JafariAt the present research the connecting rod of universal tractor (U650) was simulated using ANSYS software and with its fatigue analysis, longevity after a 1000000-cycle load, was assessed. The goal of the investigation was analyzing connecting rod behavior against repet MoreAt the present research the connecting rod of universal tractor (U650) was simulated using ANSYS software and with its fatigue analysis, longevity after a 1000000-cycle load, was assessed. The goal of the investigation was analyzing connecting rod behavior against repetitive loads for fatigue phenomena. The results not only save cost and time but also optimize design process. By sophisticated analysis, critical nodes which probability of crack growth is more were finding. Results show that the critical point of crack growth obtained with 26.793 Mpa .This point in both tensile and compression test shows critical attitude. With fully reversed loading condition, load fluctuation cycle is about 108 so that with less stress concentration factor, it could be increase. The results obtained from the present paper can be used to bring up modifications in connecting rod manufacturing. Manuscript profile -
Open Access Article
410 - Finite element simulation of the effect of the second pulse current on temperature distribution and nugget size in resistance spot welding of TRIP1100 steel
Hamid Ashrafi Iman HajianniaIn this study, simulation of the effect of the second pulse current on temperature distribution and nugget size of TRIP1100 steel during resistant spot welding was performed by finite element method. Then, the effect of the second pulse current on the weld nugget size, MoreIn this study, simulation of the effect of the second pulse current on temperature distribution and nugget size of TRIP1100 steel during resistant spot welding was performed by finite element method. Then, the effect of the second pulse current on the weld nugget size, weld nugget microstructure and mechanical properties of the resistant spot welds of the above-mentioned steel was experimentally investigated. Temperature distribution, weld nugget dimensions and heating and cooling cycles during resistant spot welding were predicted by simulation. Based on the simulated thermal cycles and continuous cooling transformation diagram of the TRIP1100 steel, a fully martensitic microstructure was predicted for the weld nugget in all currents. A good agreement was obtained between the simulated and experimental results. It was observed that the nugget diameter logarithmically increases with increasing the second pulse current. Furthermore, the microstructure of weld nugget in all samples was fully martensitic. Assessment of the mechanical properties of the welded samples by shear tension test demonstrated that the maximum load increases with increasing the weld nugget diameter. Nevertheless, the fracture energy decreased with increasing the nugget diameter. Manuscript profile -
Open Access Article
411 - Investigating the Effect of Poly (D L-Lactic Acid) Molecular Weight on the Shape Memory Parameters: A Molecular Dynamics Study
Mohammad Amini Abbas MontazeriShape memory polymers are a subset of smart materials that can regain their original shape after a temporary deformation. In recent years, these polymers have been vastly utilized in many industries (especially biomedical). The main purpose of this study was to find the MoreShape memory polymers are a subset of smart materials that can regain their original shape after a temporary deformation. In recent years, these polymers have been vastly utilized in many industries (especially biomedical). The main purpose of this study was to find the influence of the polymer molecular weight on the various shape memory parameters. Additionally, the mechanisms governing the shape memory behavior of polymers are thoroughly studied. Calculating the glass transition temperature and exploring its role on the shape memory behavior of polymeric materials are the other objectives of the current research. In this study, all models were built via Materials Studio and all the simulations were carried out using LAMMPS software. Based on the obtained results, the glass transition temperature of polymer increases with increasing the degree of polymerization. The attempts made to achieve an optimal microstructure revealed that the shape fixity parameter increases from 90% to 94% with increasing the molecular weight from 36000 g/mol to 108000 g/mol. In contrast to the shape fixity, the shape recovery parameter follows a descending trend with increasing the molecular weight. This is attributed to an increase in the ratio of the fixed phase to its reversible counterpart. Manuscript profile -
Open Access Article
412 - بررسی اثر آغازگر کمانشی در جذب انرژی لولههای جدار نازک استوانهای با استفاده از شبیهسازی عددی
فائزه عبدالهی محمد جواد رضوانیلولههای استوانهای جدار نازک به عنوان جاذب انرژی ضربه بواسطه ساخت و نصب آسان و ظرفیت جذب انرژی بالا در صنایع خودرو سازی استفاده میشوند. با این حال، ضعف اصلی لولههای استوانهای در نیروی پیک اولیه بالا میباشد. لذا، در این مقاله، برای غلبه بر این ضعف از یک آغازگر کمانش Moreلولههای استوانهای جدار نازک به عنوان جاذب انرژی ضربه بواسطه ساخت و نصب آسان و ظرفیت جذب انرژی بالا در صنایع خودرو سازی استفاده میشوند. با این حال، ضعف اصلی لولههای استوانهای در نیروی پیک اولیه بالا میباشد. لذا، در این مقاله، برای غلبه بر این ضعف از یک آغازگر کمانشی در ابتدای لوله استفاده شده است. این آغازگر کمانشی شامل یک میله فولادی است که توسط نوارهای کششی در ابتدای لوله استوانهای نصب شده است. در این مطالعه، پارامترهای مربوط به آغازگر از جمله ارتفاع پیش ضربه آغازگر، تعداد نوارهای کششی، زاویه قرارگیری نوارها بر روی بدنه لولههای استوانهای بررسی میشوند. بدین منظور شبیه سازی شبه استاتیک برای تعیین نیروی ماکزیمم لهیدگی، راندمان نیروی لهیدگی و جذب انرژی ویژه با استفاده از نرم افزار Ls-Dyna انجام گردید. برای بررسی صحت شبیهسازی عددی، نتایج آن با تست تجربی مقایسه شده است. نتایج نشان میدهند که مشخصات ضربهپذیری و عملکرد لولههای استوانهای با وجود آغازگرهای کمانشی به طور قابل ملاحظهای بهبود مییابد. Manuscript profile -
Open Access Article
413 - ارائه یک مدل ترمودینامیکی برای شبیهسازی موتور اشتعال جرقهای با سوخت مخلوط گاز طبیعی و اتانول
حسن زمانیسوخت گاز طبیعی به عنوان یک سوخت جایگزین از خواص احتراقی مناسب و آلودگی کمتری برخوردار است و میتواند انتخاب مناسبی برای نسل آینده باشد. مدلهای شبیهسازی از نظر کاهش در زمان و هزینهها برای طراحی و توسعه موتورهای جدید و همچنین ارزش فنی در شناخت نقاطی که نیاز به توجه خاص Moreسوخت گاز طبیعی به عنوان یک سوخت جایگزین از خواص احتراقی مناسب و آلودگی کمتری برخوردار است و میتواند انتخاب مناسبی برای نسل آینده باشد. مدلهای شبیهسازی از نظر کاهش در زمان و هزینهها برای طراحی و توسعه موتورهای جدید و همچنین ارزش فنی در شناخت نقاطی که نیاز به توجه خاص در طراحیها دارد، دارای اهمیت بسزایی هستند. در این پژوهش به ارائه مدلی ترمودینامیکی برای بررسی پارامترهای ترمودینامیکی یک موتور اشتعال جرقهای با سوخت ترکیبی مخلوط متان (C2H6O) و اتانول (CH4) پرداخته میشود. پارامترهای ترمودینامیکی شامل فشار و دمای درون سیلندر موتور، کار خورجی، انتقال حرارت به دیواره سیلندر و حرارت اتلافی بواسطه نشتی هستند. برای شبیهسازی موتور، از روابط حاکم برای مدلسازی دو ناحیهای احتراق استفاده شده است. این روابط در نرم افزار متلب به کد تبدیل شده و در نهایت با ترسیم نمودارها، مورد تحلیل قرار میگیرند. نتایج بیانگر این موضوع است که اضافه شدن درصدهای بالاتر اتانول به سوخت متان، افزایش مقادیر فشار درون سیلندر، کار خروجی و انتقال حرارت (در مرحله قدرت) را به همراه دارد. این در حالی است که متان خالص از کمترین انرژی اتلافی بواسطه نشتی و بیشترین دما در ناحیه نسوخته برخوردار است. Manuscript profile -
Open Access Article
414 - شبیه سازی جریان گالیوم در یک قالب حلقوی در حضور میدان مغناطیسی به منظور بهبود فرآیند ریختهگری
مسعود افرند مسعود کثیریوجود جریان جابجایی آزاد درون محفظهای که از یک مذاب در حال انجماد پر شده است باعث پدیدار شدن یک ساختار غیر همگن و درشت دانه در محصول نهایی میگردد. با اعمال میدان مغناطیسی مناسب بر مذاب درون محفظه، جریان جابجایی آزاد کاهش یافته و یک ساختار ریز دانه و همگن در محصول نهایی Moreوجود جریان جابجایی آزاد درون محفظهای که از یک مذاب در حال انجماد پر شده است باعث پدیدار شدن یک ساختار غیر همگن و درشت دانه در محصول نهایی میگردد. با اعمال میدان مغناطیسی مناسب بر مذاب درون محفظه، جریان جابجایی آزاد کاهش یافته و یک ساختار ریز دانه و همگن در محصول نهایی بوجود می آید. در این تحقیق، با استفاده از روش حجم محدود، به بررسی عددی تأثیر اعمال یک میدان مغناطیسی بر جریان جابجایی آزاد و میدان دما در حالت دائم و آرام درون یک حلقه طویل، که گالیم مذاب در فضای بین دو استوانه افقی هم محور قرار دارد پرداخته شده است. دیوارههای خارجی و داخلی حلقه به ترتیب دارای دمای سرد و گرم هستند. اثر قدرت میدان مغناطیسی بر میدان جریان و میدان دما، تأثیر تغییرات پارامترهای مختلف دیگری نظیر عدد رایلی، زاویة اعمال میدان مغناطیسی و نسبت شعاع های داخلی و خارجی حلقه بر میدان جریان و میدان دما مورد بررسی قرار گرفت. نتایج نشان داد که با مایل کردن میدان معناطیسی نسبت به افق مقدار عدد ناسلت افزایش یافت که این افزایش در بازه ای خاص از اعداد هارتمن محسوس تر است. همچنین با افزایش عدد رایلی روند تغییر عدد ناسلت برحسب قدرت میدان مغناطیسی تغییری نمیکند. Manuscript profile -
Open Access Article
415 - بررسی اثر سرعت خطی و دورانی ابزار بر روی جریان مواد و تولید حرارت در جوشکاری اصطکاکی اغتشاشی پلی متیل متاکریلات (PMMA)
حامد آقاجانی درازکلا در این پژوهش اثرات سرعت خطی و سرعت دورانی ابزار جوشکاری اصطکاکی اغتشاشی بر روی توزیع و تولید حرارت در سطح و درون اتصال، سیلان مواد و هندسهی محل اغتشاش پلی متیل متاکریلات (PMMA)، مورد مطالعه قرار گرفت. بهمنظور شبیهسازی فرآیند از روش دینامیک سیالات محاسباتی از م More در این پژوهش اثرات سرعت خطی و سرعت دورانی ابزار جوشکاری اصطکاکی اغتشاشی بر روی توزیع و تولید حرارت در سطح و درون اتصال، سیلان مواد و هندسهی محل اغتشاش پلی متیل متاکریلات (PMMA)، مورد مطالعه قرار گرفت. بهمنظور شبیهسازی فرآیند از روش دینامیک سیالات محاسباتی از مجموعه نرم افزار تجاری CFD Fluent 6.4 استفاده شد. برای بالا بردن دقت شبیهسازی، خط جوش که در مرز بین قطعهکارها قرار داشت، به عنوان یک سیال غیر نیوتنی با رفتار شبهمذاب در اطراف پین ابزار مدل سازی شد. نتایج حاصل از شبیه سازی نشان داد که با افزایش نسبت سرعت چرخشی به سرعت خطی ابزار، جریان مواد در جلو ابزار اندکی بیشتر میشود و ابعاد منطقه اغتشاش بزرگتر میگردد. بیشینه درجه حرارت تولید شده و اغتشاش مواد در سمت پیشرو اتصال مشاهده شد. نتایج حاصل از این مدل توسط نتایج تجربی مورد مقایسه قرار گرفت و تطابق قابل قبولی با آنها داشت. براساس پارامترهای جوشکاری مورد بررسی، حداکثر حرارت تولید شده 115 درجه سانتیگراد، بیشینه سرعت جابجایی مواد 24/0 متر بر ثانیه در شانه ابزار و بیشینه فشار ایجاد شده بر روی سیال 9 مگاپاسکال در محل اتصال پیش بینی شد. Manuscript profile -
Open Access Article
416 - Molecular simulation for prediction of mechanical properties of polylactic acid polymer for biotechnology applications
Amin Mansouri Ali Heidari Fatemeh Karimian Amir Mohammad Gholami Mehran Latifi Sheyda Shahriari -
Open Access Article
417 - The relationship between body mass index (BMI) and dental caries (dmft) and simulation of mechanical properties of lithium disilicate restoration
Behnoush Selahbarzin Yaser Mokhaieri Kowsar Mollai -
Open Access Article
418 - A study on stamping of airliner’s tail connector part through FEM simulation
Mohammad Sajjad Mahdieh Farshad Nazari Taif Ahmed Mussa Hossein Torfy Salehi -
Open Access Article
419 - بررسی نرخ سایش غلتکها در فرایند شکلدهی مجدد غلتکی سرد بهکمک شبیهسازی اجزای محدود
مهدی سلمانی تهرانی رضا خدابنده شهرکی حسام ولیدیاین مقاله به بررسی اثرات سایش غلتکها و شبیهسازی این پدیده در فرایند شکلدهی مجدد غلتکی اختصاص دارد. برای شبیهسازی پدیده سایش و بررسی نرخ سایش غلتکها از نرمافزار شبیهسازی اجزای محدود ABAQUS استفاده شده است. قطعه تولیدی مورد نظر در شبیهسازی فرایند شکلدهی مجدد غلتکی Moreاین مقاله به بررسی اثرات سایش غلتکها و شبیهسازی این پدیده در فرایند شکلدهی مجدد غلتکی اختصاص دارد. برای شبیهسازی پدیده سایش و بررسی نرخ سایش غلتکها از نرمافزار شبیهسازی اجزای محدود ABAQUS استفاده شده است. قطعه تولیدی مورد نظر در شبیهسازی فرایند شکلدهی مجدد غلتکی سرد دارای پروفیل مربعی است. پس از انجام شبیهسازی با توجه به مدل سهبعدی ایجاد شده، ناحیههای مستعد سایش روی غلتکها بررسی میشوند. همچنین اثر تغییر پارامترهای مهم مانند جنس، ضریب اصطکاک و ضخامت ورق بر روی سایش غلتکها بررسی شده است. در انتها به منظور اعتبارسنجی، نتایج حاصل از شبیهسازی با نتایج مطالعات تجربی موجود، مقایسه شده است. Manuscript profile -
Open Access Article
420 - بررسی تجربی و عددی طراحـی پیش فرم در کشش عمیق چند مرحله ای ورق های نازک فولادی استحکام بالا
اکبر زمانی علیشاه مهدی تاجداری جعفر اسکندری جم جمال صیدیدر این مقاله نتایج حاصل از آزمایش تجربی فرآیند کشش عمیق در تولید یک استوانه­ی سرکروی از جنس نوعی فولاد استحکام بالا با نتایج شبیه­سازی آن و سه نوع طراحی پیش­فرم پیشنهادی (ارائه شده) مقـایسه گردید، تا ضمن سنجش میزان صـحت نتـایج و دقت نرم­افـزار اجزاء محدو Moreدر این مقاله نتایج حاصل از آزمایش تجربی فرآیند کشش عمیق در تولید یک استوانه­ی سرکروی از جنس نوعی فولاد استحکام بالا با نتایج شبیه­سازی آن و سه نوع طراحی پیش­فرم پیشنهادی (ارائه شده) مقـایسه گردید، تا ضمن سنجش میزان صـحت نتـایج و دقت نرم­افـزار اجزاء محدود در پیش­بینی فرآیند کشش­عمیق چند مرحله­ای در ورق­های نازک فولادی استحکام بالا ، مقادیر نسـبت کشـش­حـدی مـراحل مختلف کشش و بازکشش آزمون تجربی نیز بهبود یابند. برای شبیه­سازی، از نرم­افزار اجزاء ­محدود آباکوس نسخه 3-9-6 استفاده گردید. در این تحقیق، ماده­اولیه، یک لوح دایروی از ورق فولادی 4130- AISI آنیل شـده با ضخامت mm 2 می­باشـد که در بررسی تجربی طی یک مرحله کشش، سه مرحله بازکشش و دو مرحله عملیات حرارتی آنیل به استوانه­ای با سر کروی تبدیل شد. برای معرفی خواص مکانیکی این فولاد آزمایش کشش تک محوری انجام و از نتایج آن استفاده گردید. مقایسه نتایج توزیع ضخامت در نرم­افزار اجزاء ­محدود با ضخامت‎های اندازه­گیری شده در پیرامون قطعات تولیدی در مراحل مختلف کشش و بازکشش صورت گرفت و از دقت خوبی برخوردار بود (حدوداً 55/2 درصد خطا) و بر همین اساس طراحی­های پیشنهادی نیز شبیه­سازی شد تا ویژگی‎های مناسب­ترین طرح معرفی گردد Manuscript profile -
Open Access Article
421 - بررسی عددی و تجربی برگشت فنری در خمش U شکل ورقهایی از جنس فولاد DP600
محمد شفیعی علویجه حسین ترابیان حسین امیرآبادییکی از مهمترین محدودیتها در شکلدهی مطلوب ورقهای فلزی، پدیده بازیابی کشسان در طول باربرداری است که به برگشت فنری و انحنای دیواره جانبی منجر میشود. بنابراین پیشبینی برگشت فنری و انحنای دیواره جانبی برای تولید محصولات دقیق ضروری است. در این تحقیق، تأثیر نیروی ورقگیر، Moreیکی از مهمترین محدودیتها در شکلدهی مطلوب ورقهای فلزی، پدیده بازیابی کشسان در طول باربرداری است که به برگشت فنری و انحنای دیواره جانبی منجر میشود. بنابراین پیشبینی برگشت فنری و انحنای دیواره جانبی برای تولید محصولات دقیق ضروری است. در این تحقیق، تأثیر نیروی ورقگیر، ضریب اصطکاک، ضخامت و استحکام تسلیم ورق بر مقادیر برگشت فنری و شعاع انحنای دیواره جانبی در فرایند خمکاری U شکل ورقهایی از جنس فولاد DP600 مورد بررسی قرار گرفته است. برای بررسی این عوامل از نرمافزار اجزای محدود آباکوس استفاده شده و نتایج حاصل از این نرمافزار با نتایج آزمایشگاهی مورد مقایسه قرار گرفتهاند. نتایج آزمایشگاهی، نتایج شبیهسازی اجزای محدود را تصدیق میکنند. پس از حصول اطمینان از صحت روش تحلیل اجزای محدود، بهوسیله آزمایشهای تجربی، روش تحلیل اجزای محدود با نرمافزار آباکوس بهعنوان ابزاری قدرتمند، سریع و مؤثر جهت انجام بررسی بعضی پارامترهای مهم فرایند خمکاری U شکل ورق، مانند نیروی ورقگیر، ضریب اصطکاک، ضخامت و استحکام تسلیم ورق، معرفی میشود. در نهایت با استفاده از نرمافزار مینی تب که یک نرمافزار آماری است، نتایج شبیهسازی اجزای محدود تجزیه و تحلیل شده و معادلاتی برای پیشبینی مقادیر برگشت فنری و شعاع انحنای دیواره جانبی با استفاده از مقادیر ضریب اصطکاک، نیروی ورقگیر، ضخامت و استحکام تسلیم ورق آمده است. Manuscript profile -
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422 - تاثیر هندسه زبری دیواره نانوکانال در رفتار جریان پوازیه نانوسیال آب-مس
محمد میثم امراللهی پورشیرازی داود طغرایی احمدرضا عظیمیانرفتار جریان داخل نانوکانال­ها با توجه به گسترده شدن کاربردهای آنها در سیستم­های نوین از اهمیت زیادی برخوردار است. با توجه به نتایج بدست آمده در این تحقیق شرط عدم لغزش روی دیواره نانوکانال، شرط قابل قبولی نیست زیرا لغزش در این ابعاد به پارامترهای متفاوتی از جمله Moreرفتار جریان داخل نانوکانال­ها با توجه به گسترده شدن کاربردهای آنها در سیستم­های نوین از اهمیت زیادی برخوردار است. با توجه به نتایج بدست آمده در این تحقیق شرط عدم لغزش روی دیواره نانوکانال، شرط قابل قبولی نیست زیرا لغزش در این ابعاد به پارامترهای متفاوتی از جمله زبری سطح دارد. در این تحقیق با ثابت نگه داشتن مساحت جانبی زبری ، اثر تغییر شکل آن بر روی رفتار جریان سیال بررسی شده است. مدلسازی به کمک نرم­افزار متن باز لمس با روش شبیه­سازی دینامیک مولکولی تعادلی انجام شده است. برخلاف تحقیقات گذشته، از نانوسیال موجود در شرایط آزمایشگاهی مانند آب-مس استفاده شده است. نتایج بدست آمده نشان از بیشترین تاثیر گذاری زبری مستطیلی و کمترین تاثیر گذاری زبری مثلثی بر رفتار جریان دارد و در نتیجه لغزش در نانوکانال با زبری مثلثی با شدت بیشتری رخ می­دهد. وجود زبری روی سطح باعث افزایش تعداد نوسانات در لایه های سیال می­شود ولی دامنه نوسان در نزدیکی دیواره صاف نسبت به زبر افزایش یافته است. حضور نانوذرات نیز باعث افزایش این اثرگذاری بر خواص جریان می­شود. Manuscript profile -
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423 - تحلیل لهیدگی محوری لوله های جدارنازک ساندویچی به کمک آزمایش های تجربی و شبیه سازی اجزاء محدود
سجاد آذرخش عباس رهیکاربرد سیستم­های جذب انرژی ضربه در صنایع مختلف از اهمیت ویژه­ای برخوردار است. لوله­های جدارنازک به­خاطر سبکی، ظرفیت جذب انرژی بالا، طول لهیدگی زیاد و نسبت جذب انرژی به وزن بالا به­عنوان یکی از کارآمدترین سیستم­های جذب انرژی کاربرد روز­افزونی Moreکاربرد سیستم­های جذب انرژی ضربه در صنایع مختلف از اهمیت ویژه­ای برخوردار است. لوله­های جدارنازک به­خاطر سبکی، ظرفیت جذب انرژی بالا، طول لهیدگی زیاد و نسبت جذب انرژی به وزن بالا به­عنوان یکی از کارآمدترین سیستم­های جذب انرژی کاربرد روز­افزونی پیداکرده­اند. دراین پژوهش با انجام آزمایش­های تجربی و شبیه سازی اجزاء محدود، شیوه فروریزش سازه­های جدارنازک ساندویچی توخالی و پرشده با فوم پلی­یورتان تحت اثر بارگذاری شبه­استاتیک محوری مورد بررسی و مقایسه قرار گرفته است . در مطالعه­ی آزمایشگاهی نمونه­های استوانه­ای به روش اکستروژن ساخته شده و بین دو صفحه­ی صلب تحت اثر بارگذاری شبه­استاتیک قرار گرفته و سپس نحوه­ی فروریزش نمونه، تغییرات نیرو و مقدار انرژی لازم تعیین شده اند. مدلی برای شبیه سازی فرآیند فروریزش با استفاده از تحلیل اجزای محدود ارائه و اثر رفتار غیرخطی مواد، تماس و تغییر شکل بزرگ در این شبیه سازی در نظر گرفته شده است. شبیه سازی نمونه­های آزمایش شده در نرم افزار آباکوس به صورت سه­بعدی و به روش صریح اجرا شده است. مقایسه­ی نتایج آزمایشگاهی و شبیه سازی نشان می­دهد که مدل ارائه شده برای تعیین پاسخ فروریزش و تعیین نمودار نیرو- جابه­جایی و میزان انرژی جذب شده مناسب است. با استفاده از مدل عددی، اثر ضخامت لوله، جنس مواد، عیوب هندسی و چگالی فوم بر متوسط نیروی فروریزش، میزان انرژی جذب شده و نحوه­ی فروریزش پوستههای استوانهای بررسی شده است. نتایج پژوهش نشان می­دهند که وجود فوم باعث افزایش میزان جذب انرژی در سازه­ها می­شود؛ این افزایش در میزان جذب انرژی و نیروی متوسط لهیدگی در چگالی­های بالاتر فوم، نمایان­تر است. Manuscript profile -
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424 - بررسی آزمون اصطکاکی تی شکل برای آلیاژ تیتانیوم در دمای بالا
فرزان براتی یاسر نعمتیمتغیرهای متعددی بر فرایند شکل­دهی فلزات تاثیر گذار می­باشند که یکی از مهمترین آنها اصطکاک است.اصطکاک بر نحوه سیلان ماده و همچنین نیروی مورد نیاز برای شکل­دهی اثر گذار می باشد. برای تعیین میزان و نحوه تاثیر آن داشتن مقدار دقیق ضریب اصطکاک ضروری است. این مقاله Moreمتغیرهای متعددی بر فرایند شکل­دهی فلزات تاثیر گذار می­باشند که یکی از مهمترین آنها اصطکاک است.اصطکاک بر نحوه سیلان ماده و همچنین نیروی مورد نیاز برای شکل­دهی اثر گذار می باشد. برای تعیین میزان و نحوه تاثیر آن داشتن مقدار دقیق ضریب اصطکاک ضروری است. این مقاله مربوط به مطالعه تجربی و عددی روی آلیاژ تیتانیوم با استفاده از آزمون اصطکاکی تی شکل در دمای بالا است. و با استفاده از شبیه سازی اجزا محدود و آزمایشهای تجربی اثرات پارامترهای دما، سرعت ، شعاع گوشه قالب، و شرایط اصطکاکی در آزمون تی شکل مورد مطالعه قرار گرفته است. بر اساس نتایج تجربی و عددی مشخص شد حساسیت اصطکاک در آزمایشتی شکلبا افزایش سرعت قالب یا کاهش شعاع لبه قالب و دمای آزمون،افزایش می­یابد. همچنین همخوانی بین مقادیر ضریب اصطکاک به دست آمده به وسیله نرم افزار تحلیل اجزا محدود و منحنی کالیبراسیون اصطکاکی برای شرایط مختلف اصطکاک دیده شد. Manuscript profile -
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425 - مدلسازی یاتاقان مغناطیسی با استفاده از نرمافزار Ansoft
محمد اسماعیلی ادبی شهربانو فرخندهدر این مقاله به بررسی معادلات ماکسول سه بعدی در نرمافزار Ansoft پرداخته شده است. راه حلهای Ansoft بیشتر بر اساس معادلات ماکسول و تحلیل اجزای محدود (FEA) برنامهریزی شدهاست. چنانکه تحلیل سادهای جهت محاسبه نیروی مغناطیسی موجود میان دو قطب مغناطیسی همنام که مقابل یکدیگ Moreدر این مقاله به بررسی معادلات ماکسول سه بعدی در نرمافزار Ansoft پرداخته شده است. راه حلهای Ansoft بیشتر بر اساس معادلات ماکسول و تحلیل اجزای محدود (FEA) برنامهریزی شدهاست. چنانکه تحلیل سادهای جهت محاسبه نیروی مغناطیسی موجود میان دو قطب مغناطیسی همنام که مقابل یکدیگر قرار گرفتهاند انجام گرفته و مدل سازی در نرم افزارAnsoft شرح داده و تأثیر پارامترهای مختلفی مانند جنس مواد و ابعاد هندسی بر مقدار نیروی مغناطیسی بررسی شده است. نتایج این پژوهش نشان میدهد که با در نظر گرفتن حالت خاصی از جنس مواد و ابعاد هندسی مقدار نیروی مغناطیسی 09133/18 نیوتن است. در پایان تعدادی انتخاب که میتوانستند در نرمافزار Ansoft جهت نقشهکشی مدل و تحلیل استفاده شود استخراج گردید. Manuscript profile -
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426 - بررسی عددی تاثیر مسیرهای فشار دوخطی بر پرشدن گوشه قالب در فرآیند هیدروفرمینگ لوله در قالب جعبه ای شکل
محسن لوح موسوی میثم شهبازیپر شدن گوشه قالب در فرآیند هیدروفرمینگ، از مسائل بسیار مهم است. تعریف صحیح مسیر فشار، یکی از پارامترهای مهم در بهبود پرشدگی گوشه قالب به شمار می رود. با این حال به دلیل پیچیدگی مسئله، هنوز ارتباط بین مسیر فشار با میزان پرشدگی گوشه به خوبی مشخص نیست. در این مقاله، تاثیر Moreپر شدن گوشه قالب در فرآیند هیدروفرمینگ، از مسائل بسیار مهم است. تعریف صحیح مسیر فشار، یکی از پارامترهای مهم در بهبود پرشدگی گوشه قالب به شمار می رود. با این حال به دلیل پیچیدگی مسئله، هنوز ارتباط بین مسیر فشار با میزان پرشدگی گوشه به خوبی مشخص نیست. در این مقاله، تاثیر مسیرهای فشار دو خطی مختلف بر پر شدن گوشه قالب در فرآیند هیدروفرمینگ لوله در قالب جعبه ای شکل به صورت عددی و تجربی بررسی شده است. مسیر فشار دو خطی، ساده ترین مسیر فشار ممکن برای انجام فرآیند هیدروفرمینگ لوله در قالب جعبه ای شکل است. در این حالت، فشار داخلی در ثانیه اول فرآیند (مرحله آب بندی) تا یک مقدار اولیه افزایش یافته و پس از انجام عمل آب بندی به تدریج تا رسیدن به فشار نهایی (فشار کالیبراسیون) بطور خطی افزایش می یابد. نشان داده می شود که برای مسیرهای فشار دوخطی که فشار اولیه آنها کمتر از فشار تسلیم باشد، یک چروکیدگی اولیه مفید در گوشه بوجود می آید که باعث بهبود پرشدگی بیشتر قالب در گوشه های طولی قالب می گردد، درحالیکه برای سایر مسیرها، در ابتدای فرآیند یک برجستگی محدب اتفاق می افتد و به همین خاطر، جریان مواد به درون قالب کند شده و در نتیجه، گوشه قالب بطور نامناسب شکل می گیرد. Manuscript profile -
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427 - استخراج عددی نمودار حد شکل دهی فولاد 304 بر اساس تغییر فاز در فرایند کشش عمیق
مسعود نصر اصفهانی مهران مرادی فرهاد حاجی ابوطالبیهدف از انجام این تحقیق، استخراج پارامترهای لازم برای مدل­سازی آسیب به روش عددی و با استفاده از نرم­افزار ABAQUS است. برای مقایسه و بررسی صحت نتایج این روش، این پارامترها به روش عملی استخراج شده­اند. برای این منظور، ابتدا پارامترهای نمودار FLD بهطور عم Moreهدف از انجام این تحقیق، استخراج پارامترهای لازم برای مدل­سازی آسیب به روش عددی و با استفاده از نرم­افزار ABAQUS است. برای مقایسه و بررسی صحت نتایج این روش، این پارامترها به روش عملی استخراج شده­اند. برای این منظور، ابتدا پارامترهای نمودار FLD بهطور عملی از آزمون اریکسن برای فولاد زنگ نزن نیمه­پایدار آستنیتی304 استخراج شده است. با یک روش جدید، رفتار تغییر فاز از آستنیت به مارتنزیت این فولاد در حین شکل­دهی کشش عمیق توسط نرم­افزارهای CLEMEX و SIGMAPLOT مدل شده است و نتایج آن با تعریف تغییرات خواص مکانیکی و فیزیکی ماده الاستیک-پلاستیک با برنامه­نویسی به زبان فورترن توسط زیربرنامه VUMAT به نرم­افزار ABAQUS انتقال می­یابد. سپس آزمون اریکسن در نرم­افزار ABAQUS شبیه­سازی گردیده و از زیربرنامه­ ذکرشده جهت تعریف تغییرات خواص در شبیه­سازی استفاده شده است. نقاط مستعد به گلویی شدن موضعی، برای تمام نمونه­ها شناسایی شده و نمودار FLD عددی بر اساس کرنش­های اصلی در این نقاط ترسیم شده است، در پایان، نتایج حاصل از این روش و پارامترهای به­دست آمده از آزمایش عملی روی نمودار FLD مقایسه می­شوند. Manuscript profile -
Open Access Article
428 - طراحی، ساخت و شبیهسازی خودروی کارتینگ
احمد کشاورزی علی اکبر صالحیامروزه با گسترش فعالیت فدراسیون اتومیبل رانی در دنیا یک از کارکردهای قدیمی خودرو یعنی مسابقه و تفریح هر روز بیشتر در دنیا مشتاقان تازهای مییابد. یکی از بهترین و ایمن ترین مسابقات مسابقات خودروهای کارتینک است. که سابقه ای نزدیک یک قرن در دنیا دارد. خودروهای کارت، خودر Moreامروزه با گسترش فعالیت فدراسیون اتومیبل رانی در دنیا یک از کارکردهای قدیمی خودرو یعنی مسابقه و تفریح هر روز بیشتر در دنیا مشتاقان تازهای مییابد. یکی از بهترین و ایمن ترین مسابقات مسابقات خودروهای کارتینک است. که سابقه ای نزدیک یک قرن در دنیا دارد. خودروهای کارت، خودروهای کوچکی هستند که میتواند با پایداری مناسب بر روی جاده و کنترل مسیر منحنی هیجان و نشاط را برای رانندگان به ارمغان بیاورند. پایداری و کنترل در هنگام عبور از پیچها دو پارامتر مهم در طراحی خودروهای کارتینک میباشد که باید طراحان همیشه در نظر داشته باشند. در این مقاله ابتدا با استفاده از روش عددی یک مدل از خودروی کارتینگ در نرم افزار Adams ساخته می شود و نتایج مختلف آزمون دینامیکی بر روی مدل انجام میگیرد و در نهایت نتایج بدست آمده از شبیهسازی با استفاده از خودروی کارتینگ ساخته شده در دانشگاه آزاد اسلامی واحد خمینی شهر مورد ارزیابی قرار میگیرد. Manuscript profile -
Open Access Article
429 - بررسی پارامترهای ولتاژ و تعداد دور سیمپیچ بر روی فرآیند شکلدهی الکترومغناطیس ورق های V شکل آلومینیوم
سجاد نادیان برسیانی احمد کشاورزی امین کلاه دوزجهت شکل­دهی قطعات بدون اثر­گذاری سنبه بر روی آنها از نیروی الکترومغناطیس که یکی روش­های شکل­دهی سریع می­باشد، استفاده می­شود. استفاده از این نیرو باعث می­شود که قطعات شکل­دهی داده شده دارای کمترین برگشت فنری و پارگی را داشته باشند و به عل Moreجهت شکل­دهی قطعات بدون اثر­گذاری سنبه بر روی آنها از نیروی الکترومغناطیس که یکی روش­های شکل­دهی سریع می­باشد، استفاده می­شود. استفاده از این نیرو باعث می­شود که قطعات شکل­دهی داده شده دارای کمترین برگشت فنری و پارگی را داشته باشند و به علت عدم اثر گذاری هزینه­های ساخت تجهیزات مانند ساخت سنبه کاهش می­یابد. در این مقاله از نیروی الکترومغناطیس جهت شکل­دهی ورق­های آلومینیوم به شکل ­وی شکل استفاده شده است. در شکل­دهی الکترومغناطیس سیم­پیچ­ها رابط بین دستگاه و قطعه­کار می­باشند. به همین جهت در این مقاله به بررسی تعداد دور و ولتاژ دستگاه در 10 سطح پرداخته شده است. با توجه به نتایج بدست آمده و تحلیل آنها با استفاده از روش­اماری فاکتوریل کامل، نشان داده شد که بهترین حالت شکل­دهی در ولتاژ 1500 ولت و سیم­پیچ 35 دور می­باشد که دلیل آن ولتاژ بالای دستگاه جهت ایجاد یک شدت جریان آنی و تعداد دور مناسب جهت انتقال کامل نیرو به قطعه کار می­باشد. بطوریکه با افزایش تعداد دور به 40 دور میزان شکل­دهی به مقدار 34/3 درصد کاهش یافته است Manuscript profile -
Open Access Article
430 - A BIBLIOMETRIC ANALYSIS OF BUILDING ENERGY SIMULATION AND OCCUPANT BEHAVIOR CULTURE ON SCOPUS DATABASE
Somayeh Dowlat Ghazal Safdarian Heidar Jahanbakhsh Fahime MotazedianThe use of fossil fuels and resulting greenhouse gas emissions are the primary causes of climate change, which are among the major challenges facing humanity currently and in the future. Buildings, accounting for half of the world's energy consumption during constructio MoreThe use of fossil fuels and resulting greenhouse gas emissions are the primary causes of climate change, which are among the major challenges facing humanity currently and in the future. Buildings, accounting for half of the world's energy consumption during construction and operation, have a significant potential for energy reduction. One of the fundamental solutions for estimating and reducing energy consumption in buildings is the use of energy simulation. The aim of this study is to comprehensively review the existing literature in the field of energy simulation in buildings based on previous studies to provide a complete description of the research conducted in this area. Using a systematic research method, information extracted from the Scopus database between 1982 and 2022 was preprocessed and classified. By examining 2929 scientific documents and considering the functional objectives of bibliometric studies, trends and declines, the most important articles, authors, and countries in the field were identified. Additionally, with regard to network objectives, influential co-citation patterns were identified, and then hotspots in the field were identified through explicit content analysis of keywords. Finally, gaps and future research trends in the field of energy simulation in buildings were identified and introduced. Manuscript profile -
Open Access Article
431 - The Strategic Model of the Effect of Knowledge Management on the Production Rate: Fuzzy Cognitive Mapping Approach
Alireza Agha gholizade sayar Kamran Rahimi Reza Gharaeepour Zohreh Hassani Knowledge management in different organizations has been adapted by effective use of resources and achieving competitive advantage. In this regard, organizations must consider a model for solving their current problems that can be the most effective in the More Knowledge management in different organizations has been adapted by effective use of resources and achieving competitive advantage. In this regard, organizations must consider a model for solving their current problems that can be the most effective in the organization's outputs with the least conflict. Therefore, in this study, the basics and variables of knowledge management were used to evaluate the supply chain performance of an oil products company. For this purpose, 5 main indicators of knowledge management including: creation, storage, sharing, exploitation and evaluation of knowledge were used, which these 5 indicators in the form of 26 variables were considered as model input. In the proposed model, first 26 knowledge management variables are refined by fuzzy cognitive mapping methods and the importance of each of them is determined, then using the concepts of systems dynamics, their effect on supply chain variables is measured in the form of cause and effect diagrams. Finally, according to the flow diagram and presentation of scenarios, we see that by using the proposed model, the production rate will increase by 30%. Manuscript profile -
Open Access Article
432 - A simulation Model to Predict and Improve the Performance of the Working Team and Achieve better Human-Resource Management Strategies (Case Study: Department of Industrial Management, Faculty of Management and Economics, Sciences and Research Branch, Islamic Azad University)
fatemeh eskandar reza radfar abas toloiGiven the importance of the role of human resources in organizations, strategic planning for achieving the optimum number of human resources in an organization is vital. The purpose of this research is to present a model for simulating and predicting team performance in MoreGiven the importance of the role of human resources in organizations, strategic planning for achieving the optimum number of human resources in an organization is vital. The purpose of this research is to present a model for simulating and predicting team performance in industrial management teams in order to identify human-resource performance and improve human-resource management strategies. The factors that influence team performance are identified and extracted from previous studies, and then the timing of each task is examined in three scenarios, i.e. optimistic, probabilistic and Web-based, by identifying the processes that influence team performance. Model inputs are the number of students, the number of faculty, and the number of experts. Based on related studies, team performance outputs are three categories: The number of books, articles and theses; the desirability of team members; and the number of tasks completed, rejected, needed to revise or waiting in queue. The simulation was performed using Any Logic software. The results show that the desirability of the group manager and the training expert have the highest values in most scenarios and the number of tasks in the execution queue has a significant value in all scenarios. In some cases it is essential that new policies be adopted to improve HRM strategies in the industrial management department. Manuscript profile -
Open Access Article
433 - Strategic Analysis of Mobile Value Added Services (M-VAS) Market in Iran Using the System Dynamics Approach
Mohammad Ali Valafar naser hamidi mahmood alborzi Seyed Javad Iranban FardDespite the launch of mobile app markets in Iran, these markets have not been able to capture a significant market share under a highly competitive environment. Therefore, it is very important for industry managers to review and improve the acceptance process of these m MoreDespite the launch of mobile app markets in Iran, these markets have not been able to capture a significant market share under a highly competitive environment. Therefore, it is very important for industry managers to review and improve the acceptance process of these markets. After identifying the factors influencing the acceptance and attractiveness of marketplaces, this study examined the network effect by providing a dynamic model based on bass diffusion theory and modeled and simulated the studied market. This was done by presenting dynamic hypotheses, plotting causal loop diagram (CLD), stock-flow diagram (SFD), and entering mathematical equations in Vensim software. Then, after validating and ensuring the correctness of the model's performance, two different policies were implemented in the model. The research findings show that under the pressure of the Play Store, Iranian markets are still forced to improve their services and at the same time try to reduce the competitive distance with it. These marketplaces need to reconfigure their existing resources and core competencies, given the market dynamics and to gain emerging opportunities. Manuscript profile -
Open Access Article
434 - Designing strategic model of waste reduction in the supply chain : systems dynamics approach
Alireza Agha gholizade sayar Majid Ghaderi rahghi Kamran Rahimi Mehdi IzadyarIn today's world, the economic and social development of societies, due to the scarcity of resources, is highly dependent on the planned and optimal use of resources and facilities. The increasing trend of waste in the supply chain is one of the main challenges of most MoreIn today's world, the economic and social development of societies, due to the scarcity of resources, is highly dependent on the planned and optimal use of resources and facilities. The increasing trend of waste in the supply chain is one of the main challenges of most countries, especially developing countries. Therefore, the optimal use of resources and reducing the amount of waste play a key role in improving the efficiency of organizations. Therefore, in this study, we seek to provide a dynamic strategic model for reducing waste in the supply chain of petroleum products in the framework of systems thinking. This research has been studied in a petrochemical company for a period of 20 years. In the proposed model, using the opinions of experts, first 26 knowledge management variables are refined by fuzzy cognitive mapping methods and the importance of each of them is determined, then using the concepts of systems dynamics, their effect on supply chain variables in the form of cause chart. Finally, according to the flow diagram and the proposed scenarios, at the end of the study period, the amount of waste is reduced by 45%, which leads to a reduction in system costs. Manuscript profile -
Open Access Article
435 - Evaluation of Aquacrop model for decreasing water stress effects due to different wheat planting date
Mohammad Reza Emdad arash taftehPlanting date is one of the effective factors for crop yield production that appropriate chooses; it can increase plant yield production. One of the advanced and practical models in the water, soil and plant is Aquacrop that has high ability and performance in different MorePlanting date is one of the effective factors for crop yield production that appropriate chooses; it can increase plant yield production. One of the advanced and practical models in the water, soil and plant is Aquacrop that has high ability and performance in different crop simulation and environmental conditions. In this regard using of long term meteorological data of 14 years (2000-2014), the effect of general different planting dates of wheat (within 7 days) in the Hamidiyeh region using Aquacrop model was investigated. In order to validate and comparing the results of Aquacrop model simulation with measured data, two pilots were considered. The results of yield measured data in two pilots in 2014-2015 indicated that if wheat is cultivated in the range of the second decade of November, the wheat yield production can increase from 2 to 2.6 ton/ha. The results of the model simulation and measured data showed that the Aquacrop model has high performance and ability for wheat yield simulation based on wheat planting date and can be used in the similar conditions with reasonable accuracy(root mean square error and absolute error are 0.26 and 11% respectively) in different planting dates for wheat yield simulation. Regarding to probability of rainfall occurrence in second decade of November (about 37 %), selecting planting date in that range accompanying with increasing soil surface moisture (about 80%), than planting date in first decade, can increase seed germination. In this condition water stress is less and more yields are predictable. Manuscript profile -
Open Access Article
436 - Ranking Bank Branches with Interval Data By IAHP and TOPSIS
Tayebeh Rezaeitaziania Mahnaz Barkhordariahmadi -
Open Access Article
437 - Evaluation of Aquacrop Model for predicting wheat yield indifferent fertilizer managments
Mohammad Reza Emdad Arash TaftehLack of supply fertilizer (on time and sufficient quantitities) affects wheat yield. On the other hand, in most of the Khozestan soils, soil organic carbon is very low and ferilizer managment is very poor. The climatic data required in Aquacrop model was collected from MoreLack of supply fertilizer (on time and sufficient quantitities) affects wheat yield. On the other hand, in most of the Khozestan soils, soil organic carbon is very low and ferilizer managment is very poor. The climatic data required in Aquacrop model was collected from sinoptic metereological wheather station of Ahvaz. In this research, to different fertilizer management inclouding regular fertilizer management by farmer and non-limited fertilzer for whaet production has been considered. Based on farm management and phenological stage of wheat plant, grain yield is measured and compared with the results that simulated by Aquacrop model. in the first year, effect of different fertilizer management( optimal nutritional condition) and farmer fertilizer management in three pilots of hamidiyeh was investigated. After that simulation and validation of data has been conducted using Aquacrop model. In the second year two fertilizer management inclouding farmer and non-limited fertilizer management were used for data verification and compaired with that resulted in first year. The average wheat yeild in regular fertilizer that measured and simiulated by Aquacrop model were about 2.7 and 2.6 ton/h respectively. Data simulation of wheat yield showed a close results with measured data in field condition. The results of second year showed that in non-limited fertilizer condition, the wheat yield in measured and simulation condition by Aquacrop are 4.5 and 4.3 t/h respectively(with 5%Error). These results demonstrated that Aquacrop model has high performance and ability for crop yeilds simulation in different fertilizer managements. Manuscript profile -
Open Access Article
438 - Evaluation of the Behavior of Reinforced Concrete (RC) Beams Reinforced with FRP Bars Containing Ground Granulated Blast Furnace Slag (GGBFS)
Arsalan Usefi pour Leila Hosseinzade Seyedeh Mahdieh Miralami yousof zandiwas studied. Compressive, and splitting tensile strengths were used to investigate the mechanical properties of concrete containing ground granulated blast furnace slag (GGBFS) at 28 days of age. GGBFS was used in the form of weight percentages instead of cement (0, 30, Morewas studied. Compressive, and splitting tensile strengths were used to investigate the mechanical properties of concrete containing ground granulated blast furnace slag (GGBFS) at 28 days of age. GGBFS was used in the form of weight percentages instead of cement (0, 30, 40, and 50%). The results of the experiments were used to simulate the properties of concrete materials in ABAQUS software. According to the results, the compressive and splitting tensile strengths of the specimen with 30% GGBFS were 10% and 5.02% higher than those of the control specimen. Then 12 concrete beams were simulated in ABAQUS software. The effect of bar type (steel and GFRP), the ratio of longitudinal reinforcement, and the mechanical properties of concrete with and without GGBFS were investigated. The results showed that increasing the ratio of GFRP longitudinal reinforcement in beams without GGBFS caused a significant increase in the load-bearing capacity up to 21.89% and a decrease in the central displacement of the beams up to 15.10%. Also, the use of steel bars with the same ratio of longitudinal reinforcement as GFRP bars achieved better results (an increase of 29.38% in bearing capacity and a decrease of 35.15% in the central displacement of the specimens). It should be noted that the values of the bearing capacity and central displacement of the simulated specimens were compared with the corresponding values in the relations provided in the ACI 440.1R-15 guide. Manuscript profile -
Open Access Article
439 - Evaluation of potato water productivity under deficit irrigation conditions using modeling approach
mahsa mostafavi Yousef Hasheminejhad محمد آرمین Hamid Marvi koorosh shojaeiThis study was conducted in order to evaluate the SWAP model to simulating yield and water productivity of potato under deficit irrigation conditions in the main potato cultivation regions of Razavi Khorasan province, including Fariman, Ghoochan, and Golmkan in 2019. Fi MoreThis study was conducted in order to evaluate the SWAP model to simulating yield and water productivity of potato under deficit irrigation conditions in the main potato cultivation regions of Razavi Khorasan province, including Fariman, Ghoochan, and Golmkan in 2019. First, the model performance to simulate the leaf area index and potato yield was evaluated based on the measurements taken from the fields of three locations. Then, using the evaluated model, the potato yield and water productivity were simulated under different irrigation and deficit irrigation scenarios, including irrigation based on farmer management, and 100, 90, 80, 70, 60 and 50% of potato water requirement. The results showed that the SAWP model had good performance in simulating potato leaf area index (R2>0.89 and RMSE<0.73), yield (R2=0.96 and RMSE=5.908 kg ha-1), and water productivity (R2=0.93 and RMSE=0.5 kg m-3). Compared to full irrigation, by reducing irrigation water amount to 50% of the water requirement, the potato yield decreased. The amount of yield decrease for each one percent decrease in the amount of irrigation water in Ghoochan, Fariman, and Golmkan was 255.97, 120.19 and 78.62 kg ha-1, respectively. The potato water also increased by using deficit irrigation up to 50% of the water requirement in Golmkan and Fariman and up to 90% of the water requirement in Ghoochan. In general, by adopting the deficit irrigation at the level of 80% of the water requirement in Golmakan and Fariman and 90% of the water requirement in Ghoochan, it is possible to improve the water productivity compared to full irrigation while maintaining the optimum yield. Manuscript profile -
Open Access Article
440 - Improvement of Agents Performance in Artificial Society Using Reinforcement Learning
Amirpooyan Khodabakhshi Arash Rahman Mohsen RohaniAbstract Usually in multi-agent systems, interactions between agents and agents interactions with the environment would be formed as selection and implementation of operations of a limited set of specific actions by agents. Therefore, the type and complexity rate of th MoreAbstract Usually in multi-agent systems, interactions between agents and agents interactions with the environment would be formed as selection and implementation of operations of a limited set of specific actions by agents. Therefore, the type and complexity rate of the emergent behaviours resulting from these interactions is also dependent on the how to implementation and numbers of applicable behaviours by the agents. In the conducted research it was tried to investigate the impact of learning on improvement of agents’ behaviour in the selection of methods (strategies) of experience transfer and in improving the welfare indexes (measures) in the artificial society with the development of model of acquiring and transferring experience as well as adding learning capability to agents. Reinforcement learning was the learning method proposed in this study to increase the range of agents’ capabilities. With using this method, agents learned over time how to select and implement more appropriate actions in confrontation with different environmental conditions to be closer to the individual and social goals. The results of simulation and experiments showed that applying learning process can lead to improve behaviour of agents and improve welfare indexes (measures) in the artificial society. Manuscript profile -
Open Access Article
441 - Examining the verdict of simulation therapy from the point of view of Shia and Hanafi jurisprudents
sayed askari Hosseini Moghadam alireza safari عباس عرب خزائلی Sayed Ali Hashmi Khan AbbasiAmong the evolving human achievements are therapeutic simulation and the technique of obtaining stem cells from the embryo. In this technology, embryos are created in the laboratory to use the stem cells of those embryos to treat diseases. In the meantime, obtaining ste MoreAmong the evolving human achievements are therapeutic simulation and the technique of obtaining stem cells from the embryo. In this technology, embryos are created in the laboratory to use the stem cells of those embryos to treat diseases. In the meantime, obtaining stem cells from laboratory embryos, which is the basis of therapeutic simulation, is desirable in Islamic jurisprudence for some and rejected by others. Accordingly, in this study, we intend to use the Islamic rules in a comparative comparison to analyze and analyze therapeutic simulation in terms of the jurisprudence of Islamic religions. The research method of this article is descriptive analysis. Research information has also been collected in a library. Findings show that famous Shiite and Sunni jurists agree in this regard and consider the use of this treatment technique as a step towards a deeper understanding of the hidden traditions of the universe and based on the principle of immorality and permission, accept it according to the principles. And they consider the claim of impermissibility to be justified. Manuscript profile
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