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Open Access Article
1 - The quantum fluctuations of charge and current in a driven nonlinear LC-circuit with a linear capacitor and a nonlinear inductor
Ameneh Zamani Hasan Pahlavani -
Open Access Article
2 - Impact of p-type semiconductor substrate on the transient response of metal-semiconductor-metal photodetector
Ali Barkhordari Hamid Mashayekhi Şemsettin Altındal Süleyman Özçelik Yashar Azizian-Kalandaragh -
Open Access Article
3 - A theoretical mesh-free scheme to model viscous drop interactions: a particle-based method
Alejandro Acevedo-Malavé -
Open Access Article
4 - Unsteady isothermal flow behind a magnetogasdynamic shock wave in a self-gravitating gas with exponentially varying density
G. Nath -
Open Access Article
5 - Analytical study of nonlinear oscillatory systems using the Hamiltonian approach technique
Martin Hermann Masoud Saravi Hadi Ebrahimi Khah -
Open Access Article
6 - The comparison of homotopy perturbation method with finite difference method for determination of maximum beam deflection
Masoud Saravi Martin Hermann Hadi Ebrahimi Khah -
Open Access Article
7 - Solutions of D-dimensional Schrodinger equation for Woods–Saxon potential with spin–orbit, coulomb and centrifugal terms through a new hybrid numerical fitting Nikiforov–Uvarov method
A. Niknam A. A. Rajabi M. Solaimani -
Open Access Article
8 - The new implicit finite difference scheme for two-sided space-time fractional partial differential equation
Hamid Reza Khodabandehlo Elyas Shivanian Shaaban MostafaeeFractional order partial differential equations are generalizations of classical partial differential equations. Increasingly, these models are used in applications such as fluid flow, finance and others. In this paper we examine some practical numerical methods to solv MoreFractional order partial differential equations are generalizations of classical partial differential equations. Increasingly, these models are used in applications such as fluid flow, finance and others. In this paper we examine some practical numerical methods to solve a class of initial- boundary value fractional partial differential equations with variable coefficients on a finite domain. Stability, consistency, and (therefore) convergence of the method are examined. It is shown that the fractional method based on the shifted Grunwald formula is unconditionally stable. This study concerns both theoretical and numerical aspects, where we deal with the construction and convergence analysis of the discretization schemes. A numerical example is presented and compared with exact solution for its order of convergence./////////Fractional order partial differential equations are generalizations of classical partial differential equations. Increasingly, these models are used in applications such as fluid flow, finance and others. In this paper we examine some practical numerical methods to solve a class of initial- boundary value fractional partial differential equations with variable coefficients on a finite domain. Stability, consistency, and (therefore) convergence of the method are examined. It is shown that the fractional method based on the shifted Grunwald formula is unconditionally stable. This study concerns both theoretical and numerical aspects, where we deal with the construction and convergence analysis of the discretization schemes. A numerical example is presented and compared with exact solution for its order of convergence. Manuscript profile -
Open Access Article
9 - An efficient iterative method for solving differential equations of fuzzy Bratu type
Bahram AgheliIn this paper, we consider the Brato differential equation, in which the boundary condition values are fuzzy values and the purpose is to calculate the approximate Solution. For this, first, using arithmetic operations on fuzzy data, we convert the Bratu differentia MoreIn this paper, we consider the Brato differential equation, in which the boundary condition values are fuzzy values and the purpose is to calculate the approximate Solution. For this, first, using arithmetic operations on fuzzy data, we convert the Bratu differential equation into three sets of differential equations with exact value, and then, using the Tamimi and Ansari method (TAM), the approximate solution of the differential equation can be calculated. Finaly, two examples to express efficiency and simplicity by finding an approximate solution have been presented. Matmetica software has been used for all calculations and plots. Manuscript profile -
Open Access Article
10 - A new method for solving n-order fuzzy differential equation by using polynomial interpolation
Elham Ahmadi Nazanin AhmadiA new method for solving n-order fuzzy differential equation by using polynomial interpolationA new method for solving n-order fuzzy differential equation by using polynomial interpolationGiven the importance of the role of fuzzy differential equations in science and en MoreA new method for solving n-order fuzzy differential equation by using polynomial interpolationA new method for solving n-order fuzzy differential equation by using polynomial interpolationGiven the importance of the role of fuzzy differential equations in science and engineering,in this paper, we study a numerical method for solving N th order fuzzy differential equations under generalized differentiability. In this method a solution of fuzzy differential equation is approximated by fuzzy polynomial in the form of piece wise fuzzy polynomials in eachsub interval of interval solution. In special case, for solving second order fuzzy differential equation under generalized differentiability, according to the type of differentiability, four cases are considered, then fuzzy polynomial approximation in each cases for solving fuzzy differential equation were constructed. The order of the piece wise fuzzy polynomial in each sub interval of solution is two .Finally this method is illustrated by solving two second order fuzzy differentialequations under generalized differentiability. Manuscript profile -
Open Access Article
11 - Numerical solution of Voltra algebraic integral equations by Taylor expansion method
Azizollah Babakhani E. Enteghami H. HosseinzadeAlgebraic integral equations is a special category of Volterra integral equations system, that has many applications in physics and engineering. The principal aim of this paper is to serve the numerical solution of an integral algebraic equation by using the Taylor expa MoreAlgebraic integral equations is a special category of Volterra integral equations system, that has many applications in physics and engineering. The principal aim of this paper is to serve the numerical solution of an integral algebraic equation by using the Taylor expansion method. In this method, using the Taylor expansion of the unknown function, the algebraic integral equation system becomes a linear equation system of the unknown function and its derivatives. Moreover, the convergence analysis of this method will be shown by preparing some theorems. Several examples are included to illustrate the efficiency and accuracy of the proposed technique and also the results are compared with the different methods. Manuscript profile -
Open Access Article
12 - Some properties of sums of weighted composition operators on the Fock space
Mahsa Fatehi Asma NegahdariLet H be a Hilbert space. For each f∈H, we define a multiplication operator M_φ by M_φ (f)=φf. Let φ be an entire function. For each f belongs to the Fock space F^2, the composition operator C_φ is defined by C_φ (f)=f∘φ. For entire func MoreLet H be a Hilbert space. For each f∈H, we define a multiplication operator M_φ by M_φ (f)=φf. Let φ be an entire function. For each f belongs to the Fock space F^2, the composition operator C_φ is defined by C_φ (f)=f∘φ. For entire functions ψ, φ and f∈F^2, the weighted composition operator C_(ψ,φ) on F^2 are given by C_(ψ,φ) (f)=ψ.(f∘φ). Let T be a bounded operator on H, the set W(T)={⟨Tf,f⟩:‖f‖=1} is called the numerical range of T. In this paper, we find the point spectrum of some operators C_(ψ_1,φ_1 )+C_(ψ_2,φ_2 ), when φ_1 and φ_2 have the some fixed point. Moreover, we obtain an invariant subspace for the operator (C_(ψ_1,φ_1 )+C_(ψ_2,φ_2 ) )^*. Then by these results, for compact operators C_(ψ_1,φ_1 ) and C_(ψ_2,φ_2 ), we find the spectrum of C_(ψ_1,φ_1 )+C_(ψ_2,φ_2 ). Then for φ_1 and φ_2 which have the some fixed point, we investigate the numerical range of C_(ψ_1,φ_1 )+C_(ψ_2,φ_2 ). Manuscript profile -
Open Access Article
13 - Studying a numerical stable and quadratic convergence method for solving a new class of absolute value equations.
mozafar rostami Taher Lotfi Ali BerahmandIn this paper, a new class of absolute value equations is studied as follows:Ax-B|x|-b=o, ( B≠I, σ_"max" (|B|)<σ_"min" (A) ), This new class of absolute value equations, the single value absolute matrix B is less than the single value matrix A and the MoreIn this paper, a new class of absolute value equations is studied as follows:Ax-B|x|-b=o, ( B≠I, σ_"max" (|B|)<σ_"min" (A) ), This new class of absolute value equations, the single value absolute matrix B is less than the single value matrix A and the matrix B is not exclusively the identity matrix..Therfore the power of choice is wider than other methods of the absolute value equations and all matrices are arbitrary and this new class of absolute value equation is the NP hard problem..We solve this new class using a generalized Newton method and also convergence and numerical stability. Also, by testing the numerical examples of the efficiency and effectiveness of the solution method for the new class, it has been studied with other works that have been done including Lotfi and Zainali and Mangasarain and Khaksars method.Eceptthis new class and Lotfi and Zainali method are quadratic convergence, the rest methods are linear convergence. Manuscript profile -
Open Access Article
14 - 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
15 - Approximated solution of First order Fuzzy Differential Equations under generalized differentiability
T. Allahviranloo N. Ahmady E. AhmadyIn this research, a numerical method by piecewise approximated method for solving fuzzy differential equations is introduced. In this method, the solution by piecewise fuzzy polynomial is present. The base of this method is using fuzzy Taylor expansion on initial value MoreIn this research, a numerical method by piecewise approximated method for solving fuzzy differential equations is introduced. In this method, the solution by piecewise fuzzy polynomial is present. The base of this method is using fuzzy Taylor expansion on initial value of fuzzy differential equations. The existence, uniqueness and convergence of the approximate solution are investigated. To show the advantage of method, this method is compared with the Euler method that was introduced in [۱], and it is shown this method is more accurate than Euler method for solving fuzzy differential equations under generalized differentiability. Manuscript profile -
Open Access Article
16 - extend numerical radius for adjointable operators on Hilbert C^* -modules
M. Shah Hosseini B. MOOSAVIIn this paper, a new definition of numerical radius for adjointable operators in Hilbert -module space will be introduced. We also give a new proof of numerical radius inequalities for Hilbert space operators.In this paper, a new definition of numerical radius for adjointable operators in Hilbert -module space will be introduced. We also give a new proof of numerical radius inequalities for Hilbert space operators. Manuscript profile -
Open Access Article
17 - Stability Analysis of a Fractional Order Model of HIV virus and AIDS Infection in the Community
M. S. Shahrokhi Dehkordi Y. AhmadiIn this paper a non-linear model with fractional order is presented for analyzing and controlling the spread of HIV virus. Both the disease-free equilibrium and the endemic equilibrium are found and their stability is discussed. The basic reproduction number , which is MoreIn this paper a non-linear model with fractional order is presented for analyzing and controlling the spread of HIV virus. Both the disease-free equilibrium and the endemic equilibrium are found and their stability is discussed. The basic reproduction number , which is a function of the constant parameters in the model, plays an essential role in the stability of the above model. In more precise expression, When the disease-free equilibrium is attractor, but when , is unstable and the endemic equilibrium exists and it is an attractor. Finally numerical simulations are also established to investigate the influence of the parameters in the model on the spread of the disease. Manuscript profile -
Open Access Article
18 - Dual Spacization Approach to the Electronic Publishing
Saied Reza Ameli -
Open Access Article
19 - Numerical solution for one-dimensional independent of time Schrödinger Equation
Z. Yousefian N. Shadmani -
Open Access Article
20 - Investigation of analytical and numerical solutions for one-dimensional independent-oftime Schrödinger Equation
Z. Yousefian Molla Gh. Islampour -
Open Access Article
21 - Study of the degree of development of East Azerbaijan cities by numerical taxonomy and cluster analysis
jafar ebrahemiAbstractSince one of the main pillars of development is attention to equality and justice in the distribution of resources between different sectors of society, therefore, the concentration and inappropriate distribution of facilities and services in different regions h MoreAbstractSince one of the main pillars of development is attention to equality and justice in the distribution of resources between different sectors of society, therefore, the concentration and inappropriate distribution of facilities and services in different regions have always been considered as one of the pitfalls of development, which requires a scientific review. In this research, the main goal was to study the degree of development of the cities of East Azerbaijan province. To achieve this goal, 31 indicators of development were assessed in three categories: socio-cultural, health, and economic and infrastructure in 20 cities. The methodology of this study is to classify the provinces based on numerical mal taxonomy and cluster analysis and also, the method of collecting is documentary information. The results of this study showed that, the cities of Tabriz, Marand and Maragheh are in high ranking of development, respectively, and the cities of Khadafrien and Charaymahq are in the last positions. The results of the research show that, the development rate in the western part of the province was higher than the eastern regions, and the level of development is in relation to the distance from the center, and access to rail and road transport lines. Manuscript profile -
Open Access Article
22 - Study of the degree of development of East Azerbaijan cities by numerical taxonomy and cluster analysis
Jafar Ebrahimi Mostafa Azkla Samad Rasolzadeh RasolzadehAbstract Since one of the main pillars of development is attention to equality and justice in the distribution of resources between different sectors of society, therefore, the concentration and inappropriate distribution of facilities and services in different regions MoreAbstract Since one of the main pillars of development is attention to equality and justice in the distribution of resources between different sectors of society, therefore, the concentration and inappropriate distribution of facilities and services in different regions have always been considered as one of the pitfalls of development, which requires a scientific review. In this research, the main goal was to study the degree of development of the cities of East Azerbaijan province. To achieve this goal, 31 indicators of development were assessed in three categories: socio-cultural, health, and economic and infrastructure in 20 cities. The methodology of this study is to classify the provinces based on numerical mal taxonomy and cluster analysis and also, the method of collecting is documentary information. The results of this study showed that, the cities of Tabriz, Marand and Maragheh are in high ranking of development, respectively, and the cities of Khadafrien and Charaymahq are in the last positions. The results of the research show that, the development rate in the western part of the province was higher than the eastern regions, and the level of development is in relation to the distance from the center, and access to rail and road transport lines. Manuscript profile -
Open Access Article
23 - A Study of Challenges of Constant Urban Development of Qazvin from Spatial justice's Viewpoint
mahmoud davaran اصغر نظریانOne of the main goals of constant development is to establish spatial justice in order to provide the citizens with freedom, welfare, and security. This essay takes advantage of numerical taxonomy, AHP, and Topsis techniques to study challenges of Qazvin's constant deve MoreOne of the main goals of constant development is to establish spatial justice in order to provide the citizens with freedom, welfare, and security. This essay takes advantage of numerical taxonomy, AHP, and Topsis techniques to study challenges of Qazvin's constant development in terms of spatial justice, and it tries to answer the following question : Is it possible to distribute indices of constant development of Qazvin's urban regions spatially ? This research has been done by using an analytical – descriptive method, and all required information has been compiled based on library sources. The analysis of taxonomy shows that six districts of Qazvin have a lower rank of development and district 9 with Fi= 0/199 ranks first. It is 3.8 times more developed than district 3 with Fi =0/759. In the urban ranking of Qazvin' s districts, district 3 with Fi = 0/762 is in a better position in terms of development indices compared with districts 1 and 2. The above mentioned results show Qazvin's constant urban development's challenges from spatial justice's point of view. Manuscript profile -
Open Access Article
24 - Assessment effect of structure and texture characteristics of rock units in Alvand pluton on the outcrop resistance against destruction and weathering
Hossein Bakhtiari Ebrahim Moghimi Mohammadreza ServatiThe Alvand plutonic mass is one of the largest plutonic bodies in the Sanandaj – Sirjanmetamorphic belt. This paper evaluates outcrop relative resistance of rock units againstdestruction and weathering based on intact rock texture and structure properties with usi MoreThe Alvand plutonic mass is one of the largest plutonic bodies in the Sanandaj – Sirjanmetamorphic belt. This paper evaluates outcrop relative resistance of rock units againstdestruction and weathering based on intact rock texture and structure properties with using thenumerical value. For this purpose at first the some properties of texture and structure as thecriteria were chosen and indexed. Then relative resistance outcrop of rock unites based onnumerical value from 1 to 10 was assessed, and the zoning map was provided. AccordinglyPegmatitic granite has minimum resistence with 3.75 and Olivine gabbro has maximumreasistence with 5.75. Weighted average degree of Alvand pluton was specified 5.1 whichreflects the moderate resistance degree outcrops against destruction and weathering in terms ofstructure and texture characteristics between internal igneous rocks. Manuscript profile -
Open Access Article
25 - Uncertainty Evaluation due to TIGGE Global System Precipitation Data for Flood Forecasting
Soudabeh Behiyan Motlagh Afshin Honarbakhsh Asghar AzizianBackground and Aim: The occurrence of frequent floods in Iran necessitates a flood forecasting and warning system with a suitable lead time. The use of numerical rainfall forecasting models in flood forecasting and warning is one of the important measures taken by resea MoreBackground and Aim: The occurrence of frequent floods in Iran necessitates a flood forecasting and warning system with a suitable lead time. The use of numerical rainfall forecasting models in flood forecasting and warning is one of the important measures taken by researchers in most parts of the world. The TIGGE database includes mid-term precipitation forecasts simulated by global forecast centers. The purpose of this research is to evaluate the efficiency and the degree of uncertainty caused by the rainfall forecasts of four numerical models of the TIGGE database (including CPTEC, ECCC, ECMWF, and KMA) for simulating floods with the HEC-HMS hydrological model.Methods: In this research, the precipitation data of seven meteorological stations were used to evaluate the uncertainty of discharge from TIGGE database precipitation prediction models in the Poldokhtar watershed. Also, three flood events on March 24, 2017, April 6, 2018, and April 15, 2018, were studied. At first, precipitation forecasts were extracted from four centers CPTEC, ECCC, ECMWF, and KMA. Due to the existence of systematic error in the forecasts, a bias correction was done on them, and to correct the bias, the Delta method was used. Processed and raw forecasts of four rainfall forecasting models were entered into the HEC-HMS model for flood forecasting, and in the next step, the flow uncertainty assessment of the HEC-HMS model was performed in all members of the four rainfall forecasting models. In this research, 5 factors P, R, S, T, and RD were used for uncertainty analysis.Results: The results indicate the significant superiority of the ECMWF model in predicting precipitation events. The use of all 4 rainfall sources led to an acceptable simulation of the flood peak flow in three different events. Also, the predicted peak discharge time had little difference from the observed data. According to the results of the uncertainty analysis, the ECMWF model was considered the best model based on P, R, S, T, and RD factors. The KMA model performed well in severe and very severe floods. The group prediction system of TIGGE models also had an acceptable performance in all events. Also, the hydrological-meteorological prediction model predicted the time of flood occurrence and the probability of occurrence well.Conclusion: The intended research investigates flood forecasting and warning in the Poldokhtar watershed using the meteorological-hydrological system, based on meteorological forecasts of the TIGGE database and flood simulation using the HEC-HMS hydrological model. The final product of this system is probable discharge and flood forecast. The results reveal the success of the TIGGE database in flood forecasting. The ECMWF model excelled in predicting peak discharge. The upper and lower band calculation method was used to determine the uncertainty, which showed the uncertainty well. This system displayed the time of peak discharge well and with a small time delay, which indicates its good performance. The predicted rainfall from the four centers used in this study (ECMWF, ECCC, CPTEC, and KMA) have significant differences. To reduce these differences, we used a multi-model group forecasting system that had encouraging results. Manuscript profile -
Open Access Article
26 - Reduction of Turbulence Reduction in Water Tanks with Vertical and Horizontal Walls Using Ansys Numerical Model
Ali Nomiri Amir Khosrojerdi Ali SaremiBackground and Aim: Tanks structures must maintain their applications after large earthquakes, and on the other hand, these structures must behave in a way that does not cause damage during an earthquake. Therefore, the application of the baffles is one of the suitable MoreBackground and Aim: Tanks structures must maintain their applications after large earthquakes, and on the other hand, these structures must behave in a way that does not cause damage during an earthquake. Therefore, the application of the baffles is one of the suitable methods to tackle with earthquake inertial forces. The main idea in baffle systems is to reduce the frequency of the structure and bring it to a value less than the frequencies containing the dominant earthquake energy. Baffles installed inside water tanks can reduce a significant amount of earthquake acceleration in the body and crest of the tank during an earthquake.Method: In order to investigate the effects of the vertical and horizontal plates adjusted through the reservoir tanks, the flow characteristics were simulated by employing the CFD (Ansys Fluent). Two vertical and horizontal plate were designed for this purpose. To decreasing the error of mesh sizes, the different mesh sizes with different types of the meshes were employed and the results of the simulation were compared together to find out the suitable mesh geometry. Moreover, to validate the numerical model, the height of the water waves was compared by the past literature to make sure of the suitable numerical model. Thus, by increasing the earthquake accelerin in the numerical model, the flow properties were investigated according to the different conditions of the numerical modeling.. Displacement and shear stress at the top of the tanks were measured through the numerical models due to different tests condition in controlled and uncontrolled statuses. Furthermore, the conducted acceleration through the tank liquid was measured over the time for different numerical models. Some hydraulic parameters were considered for comparison through the discussion section such as water surface elevation so these parameters were extracted from the numerical results by the software advices. Results: The comparison between numerical results and past studies indicated that the presented numerical model has acceptable error and the elevation of the water waves through the tanks has good agreement with experimental pasts models through the literatures. Furthermore, the results of the mesh analysis showed that the error of the square mesh is approximately 11.2 percent compared to the triangular shape. As a result, the squire mesh with less sizes were considered to solve the flow’s equation through the numerical model. The initial results of the vertical and horizontal baffles illustrated that presence of the baffles can significantly reduce the fluctuation of the displacement, shear stress and liquid acceleration over the time. And the agitations of tests function over the time were tended to the less values compared by the initial time. The results indicate that equipping the tanks with baffle systems has a good performance on safety and improving the dynamic behavior of the tanks and this approach has a significant effect on the displacement and acceleration responses of the studied tank. Tanks with vertical baffles will perform better due to higher energy absorption. Also, as the water depth in the reservoir increases, the amount of energy dissipation for the reservoirs were decreased.Conclusion: The results of the numerical model calibrated with experimental data showed that the tank equipped with the vertical baffle produces more control force and damping than the horizontal baffle and has a better performance than the horizontal walls, furthermore, they reduce the pressure on the wall. Also, the results indicate that equipping the tanks with baffle systems can increase the safety through the tanks and improving the dynamic behavior of the tanks. Finally, the tanks with vertical baffles had better perform to absorption of the energy. Also, as the water depth in the reservoir increases, the amount of energy dissipation for the reservoirs were decreased. Comparison over the time among the extracted data from numerical model showed that due to passed time, the fluctuation of the investigated parameters such as displacement and shear stress of the top of the tank attained less values which can show that the controlled tank has much stability along the earthquakes. Manuscript profile -
Open Access Article
27 - Estimation of Wheat Irrigation Water by Inverse Solution Method of the Production Functions under Water Stress Conditions Using NIAZAB System
Niazali Ebrahimipak Ali Abdzad Gohari Arash TaftehBackground and Aim: Different factors are effective in increasing wheat production, one of the most important of which is water. Determining the actual consumed water of wheat in arid and semi-arid regions is of particular importance and the economic use of water is a s MoreBackground and Aim: Different factors are effective in increasing wheat production, one of the most important of which is water. Determining the actual consumed water of wheat in arid and semi-arid regions is of particular importance and the economic use of water is a serious and very important issue for farmers and researchers who cultivate and produce wheat under irrigation. The season of wheat cultivation has a direct effect on its water requirement due to the change in the energy pattern affecting evapotranspiration, and it will definitely have a lower water requirement in winter than in spring and summer. Therefore, the present study was conducted in order to investigate the water requirement system in determining the actual amount of irrigation water and wheat plant yield based on the inverse solution of the production function under water stress conditions for Alvand variety wheat in Qazvin province.Method: The research was conducted in 2017-2019 crop years in Qazvin province on a land of 600 square meters in Esmailabad research station (49º 52' N, 36º 15' E, 1285 MSL). The experimental design was in the form of split plots and in the form of a randomized complete block design with three replications. So that the main factor of irrigation management includes providing water requirements of 20 (I1), 40 (I2), 60 (I3), 80 (I4) and 100 percent (I5) and secondary treatment includes irrigation until the end of the flowering stage (S1) and The pulping of the seed was (S2). The country's using NIAZAB system was provided by the Soil and Water Research Institute (SWRI). This system is designed to determine the water requirement of farmland and Orchard products, which has the ability to estimate and determine the water requirement, Consumed water and plants irrigation planning at the level of the region, city, catchment and plain. One of the prominent points of this system is its location-based nature, and the user can extract their regional needs by referring to the system and can allocate the water used for the cultivation pattern under different usage options to the beneficiaries of the agricultural water stakeholder with the ability to provide an update.Results: The results showed that the root mean square error in Tafteh, Pasquale and Raes methods was 122, 83 and 126 mm per day, respectively, and Pasquale method had a better estimation than other methods. In Pasquale's method, the best normalized root mean square error was observed with 0.18%. The index of agreement or consistency in Tafteh, Pasquale and Raes methods was 0.95, 0.98 and 0.95%, respectively, and the Coefficient of Efficiency of the model was 0.77, 0.91 and 0.73, respectively. The results of the statistical analysis showed that the measured and simulated values are close to the 1:1 line and have a good relationship, and the coefficient of determination values in the studied years showed 0.98. The results of estimation the amount of wheat plant evapotranspiration in the using NIAZAB system in the Qazvin plain with the methods of Tafteh et al. (2013), Pasquale et al. (2017) and Raes et al. (R2=0.98) were high and the root mean square error in Tafteh, Pasquale and Raes methods was 120, 83 and 126 mm per day, respectively, in which Pasquale's method had a better estimation than other methods.Conclusion In general and according to the statistical results, a good approximation was observed between the real data and the using NIAZAB system in determining the amount of irrigation water under water stress conditions, which indicates the appropriate evaluation of the water requirement system and the ability to simulate the wheat yield function in relation to different treatments. It was irrigation and this system can be used as a suitable tool in estimating water needs to improve water management in wheat. Manuscript profile -
Open Access Article
28 - Determining the Amount of Water Use and Evapotranspiration of Bean Using Tafteh, Pasquale and Raes Methods under the Conditions of Drip and Furrow Irrigation
Ali Abdzad Gohari Fatemeh Keykhaei Niazali EbrahimipakBackground and Aim: Due to the limitation of water resources, proper use of water is necessary, and the use of appropriate irrigation methods in fields is an appropriate strategies to use water. Water stress can affect crop yield in the field. Therefore, the correct met MoreBackground and Aim: Due to the limitation of water resources, proper use of water is necessary, and the use of appropriate irrigation methods in fields is an appropriate strategies to use water. Water stress can affect crop yield in the field. Therefore, the correct method of irrigation and management of water consumption is one of the basic issues in farms. The deficit irrigation strategy with the water requirement supply approach can be considered as a practical and efficient technique to ensure more crop yield, without compromising the physiological processes and yield. Therefore, the scope of this research is to estimate the amount of water consumed and the amount of evapotranspiration of the bean plant with the aim of evaluating the field conditions and comparing it with Tafteh, Pasquale and Raes methods. Method: The present study aims to determine the amount of water use and evapotranspiration of bean using Tafteh, Pasquale and Raes methods and based on the inverse solution of the yield production function in Markazi Province and at the Khomin Bean National Research Station at an altitude of 1930 meters above sea level with a length of 49 degrees and 57 minutes of latitude and 33 degrees and 39 minutes of latitude were implemented in 2016 and 2017. In this experiment, the irrigation treatment including furrow and drip-tape as the main factor and, the values of water requirement including 100, 75 and 55% of water requirement as a sub-factor and in the form of split plots in the form of randomized complete blocks design were done in three replications. Cultivated variety was of native type and its planting time was on the 10th and 9th of June respectively in the first and second year. Drip irrigation tapes were placed on the stacks and irrigation was carried out in the same way until the seedling was fully established in the stage of emergence of the third three leaves. Results: The highest seed yield with an average of 2683 kg/ha was obtained in the furrow irrigation method and by providing 100% of the water requirement. In evaluating evapotranspiration, the root mean square error (RMSE) in Tafteh, Pasquale and Raes methods were 0.160, 117.8 and 0.185 mm respectively and the root mean square normal error (RMSEn) were 0.448, 0.330 and 0.518 percent respectively. The index of agreement or compatibility (d) in Tafteh, Pasquale and Raes methods were 0.295, 0.600 and 0.081% respectively. In the investigation of irrigation water amounts, the root mean square error (RMSE) in Tafteh, Pasquale and Raes methods was 156.7, 117.5, and 181.3 mm, respectively, and the root mean square normal error (RMSEn) was 0.446, 0.335 and 0.516 percent respectively. The index of agreement or compatibility (d) in Tafteh, Pasquale and Raes methods were 0.324, 0.602 and 0.118% respectively. Conclusion: In general and according to the statistical results, Tafteh, Pasquale and Raes methods had an acceptable estimate of the amount of irrigation water and the amount of evapotranspiration in the furrow and drip conditions under different amounts of water requirement. Therefore, they can be used as appropriate tool in the estimation of water use in the studied area. Manuscript profile -
Open Access Article
29 - Study the Long-Term Effects of Industrial and Agricultural Uses on the Fluctuations of the Groundwater Level of Shazand Plain
Siamak Amiri Ahmad Rajabi Saeid Shabanlou Fariborz Yosefvand Mohammad ali IzadbakhshBackground and Aim: Nowadays, by increasing the water demand in different sectors, the withdrawal amount from groundwater resources is increasing leading to more drawdown of Markazi province aquifers. One of the most suitable methods for the optimal management of ground MoreBackground and Aim: Nowadays, by increasing the water demand in different sectors, the withdrawal amount from groundwater resources is increasing leading to more drawdown of Markazi province aquifers. One of the most suitable methods for the optimal management of groundwater resources is the analysis of the behavior of aquifers in various conditions using mathematical models. The objective of this paper is to investigate the effects of withdrawal for agricultural and industrial consumptions on the groundwater level of the Shazand plain located in Markazi Province and the impact of a 20% increase in irrigation efficiency of farms in the case of the development of under pressure and low-consumption systems using the GMS numerical model. Method: First, the conceptual and numerical model of the Shazand aquifer was executed in the GMS software and calibrated in the steady state. Then, the model was recalibrated in a transient state for the statistical period from October 2015 to September 2019. To examine the reactions of the model to the changes of important and effective parameters, the sensitivity analysis of the model was performed and the model was verified for the statistical period of October 2019 to September 2021. Then, the changes in the groundwater level in the aquifer under two reference management scenarios and increasing irrigation efficiency were investigated and compared. In the reference scenario assuming the continuation of the current conditions and in the efficiency increase scenario assuming a 20% increase in irrigation efficiency, the simulation of changes in the groundwater level in the entire Shazand plain for the upcoming 20 years from October 2021 to September 2041 was carried out. Results: Based on the obtained results, the RMSE error value related to the steady state recalibration is about 0.7 meters and the average RMSE error value in the transient state in all months of simulation in two recalibration and validation periods is less than 0.6 meters, which shows the high accuracy of the model in simulating the groundwater level in the whole plain. The sensitivity analysis showed that the changes in specific yield and hydraulic conductivity parameters have the greatest effect on the fluctuations of groundwater in the whole plain. The results showed that in the reference scenario, the drop in the groundwater level at the end of the 20-year operation period is 3.95 meters. In the scenario of a 20% increase in efficiency, with the reduction of extraction from wells due to the increase in irrigation efficiency, the amount of drop will reach 2.76 meters, in which case the amount of drop will be mitigated by 1.2 meters. Conclusion: According to the results, the highest drop in the groundwater level in both reference and increase in efficiency scenarios in the central areas of the plain is 9.2 and 6.9 meters, respectively, and the lowest drop in the western areas of the plain is 1 and 0.5 meters, respectively. Considering that the agricultural sector has the greatest impact on the level drop in the aquifer in the central areas of the plain, it is better to focus management plans to control withdrawal from the aquifer, such as increasing efficiency or modifying the cultivation pattern, on this sector. In case of the implementation of systems under pressure and increasing efficiency in the plain, the amount of drawdown in the region will be mitigated to some extent, but the problem will not be solved and it is necessary to implement supplementary programs to cultivate high consumption plants instead of high consumption crops and in the industry sector instead of extracting groundwater, treated municipal wastewater should be used. Manuscript profile -
Open Access Article
30 - Laboratory and Numerical Study into Retention of the Heavy Metal Pollutant Lead by Nanoclay Cloisite Na+
Mohammad Amiri Morteza DeiranlouBackground and Objective: In spite of the numerous studies published on soil-pollutant interaction in recent years, no considerable research has been conducted on the interaction between heavy metal pollutants and nanoclays. Lead is a common heavy metal pollutant i MoreBackground and Objective: In spite of the numerous studies published on soil-pollutant interaction in recent years, no considerable research has been conducted on the interaction between heavy metal pollutants and nanoclays. Lead is a common heavy metal pollutant in geotechnical and environmental projects. Moreover, although researchers have introduced equations for retention of metal pollutants in soils, no research has been conducted on heavy metal retention capability of nanoclays and the effect of carbonate on equations related to retention capability. Therefore, this study intended to examine the geotechnical-environmental behavior of nanoclays and carbonate-modified nanoclays in terms of capability to adsorb the heavy metal pollutant lead and to propose equations for pollutant retention by nanoclays. Method: To achieve this objective a series of environmental and geotechnical experiments were conducted to analyze the mechanism of retaining the heavy metal pollutant lead by examining pH variations, capability of pollutant retention, and through evaluating X-ray diffraction (XRD). Moreover, a series of linear and non-linear equations was used to study the capability of nanoclay Cloisite Na+ in retaining the heavy metal pollutant lead at various ambient pH values and different carbonate contents of the specimens. Findings: Results showed that carbonate content was an effective factor in pollutant retention and had to be included in the numerical equations. Inclusion of the pH variation parameter in the equations increased the correlation coefficient in the proposed equations. Discussion and Counclusion: The proposed numerical equations can be a proper substitute for laboratory methods, and also can be used in designing landfill sites. Manuscript profile -
Open Access Article
31 - Investigation of the Effect of Karkheh Dam on Ground Water Resources Using GMS Model (Case study: Dasht-Abbas, Dehloran)
mohammadreza rezaei Shahla Paimozd Ayad AazamiBackground and Objective: The most obvious effect of the dams is the change of the hydrological regime of the adjacent areas, among which these changes can be referred to the change in the base level of the adjacent aquifers. In this study, Karkheh dam and its effe MoreBackground and Objective: The most obvious effect of the dams is the change of the hydrological regime of the adjacent areas, among which these changes can be referred to the change in the base level of the adjacent aquifers. In this study, Karkheh dam and its effect on groundwater fluctuations in Abbas plain have been studied. Method: In this study, the statistics of nearby stations, 192 exploitation wells and 24 piezometric wells were used. Numerical modeling of groundwater has been done by GMS software in Dasht-Abbas aquifer in the south of Ilam province in the water year of 2011-2012. This model was calibrated in two permanent (three months) and non-permanent (12 months) for one and a half years and then for one year. Findings: The results of calibration indicate the optimal simulation of Dasht-Abbas aquifer and small differences in observational and computational values of water table level. Also, the results of water balance showed that the groundwater level in the years before the arrival of water Karkheh dam - 7.03 and after the completion of water supply channels of the positive plain balance and its amount has increased to 26.50 million cubic meters in the water year 2011-2012. Therefore, Karkheh Dam has a positive effect on the groundwater balance of the plain. Discussion and Conclusion: From the study of groundwater balance in Dasht- Abbas, it is concluded that the calibrated model in stable and unstable state has been able to simulate the water level of piezometric wells with great accuracy. The hydrograph of the piezometric wells of Dasht-Abbas showed that the water level of Dasht-Abbas is increasing. The results of groundwater balance modeling showed that the reserve changes due to the water balance of Abbas plain are positive and show the upward trend of the plain hydrograph, increasing water table and the evaporation crisis. Manuscript profile -
Open Access Article
32 - A Numerical Model for Prediction of Oil Slick Movement from Spill Accident Between Khark Island and Busher Port in The North Coastal of Persian Gulf in Summer
Shahla Habibi Ali Akbar BidokhtiAbstractIntroduction: This paper presents a three- dimensional numerical model based on 3- D Navier –Stokes and continuity equations. The model is used to simulate the prediction of the movement of oilslicks from spill accident in region between Khark Island and B MoreAbstractIntroduction: This paper presents a three- dimensional numerical model based on 3- D Navier –Stokes and continuity equations. The model is used to simulate the prediction of the movement of oilslicks from spill accident in region between Khark Island and Busher Port in the north coastal ofPersian Gulf.Material and Method: A three – dimensional model is developed based on the mass transportequation to predict the movement of oil particles in the water column. The model uses Boussinesqapproximation as Lipps. For the advection term in the model an upwind weighted, multidimensionalpositive definite advection transport algorithm (MPDATA) is used. Base on this algorithm an explicitfinite difference scheme that uses an anti-diffusive velocity sense for equilibrium diffusion effect isused. Densities of the oil and water, wind speed and horizontal and vertical diffusion coefficients arevariable in the model.Results: The computational domain covers an area of 555180 km2 with 11346 grids andx y 3000 m in spill point, 21 km offshore. The model predicts concentration distribution ofoil particles and current speeds and directions for 1.7, 7 and 14 hours in summer after spill accident in5, 10 and 15 meters levels. Numerical results show that particles spreading are towards Busher Port insummer. There is good agreement with valid theories and experiment of data runs.Discussion: This research can be helpful to predict the movement of oil pollution at sea to collectpollution from spill accident to avoid the risk of moving it to the beach. Manuscript profile -
Open Access Article
33 - Mathematical modeling for the phytoremediation of oil-contaminated soils
Faraz Montazerolsedgh Reza Ezzatian Soheila YaghmaeiIn recent years, the use of plants for soil remediation has been of much interest. Much effort has been put into lab work to obtain experimental data, but despite the great importance of theoretical aspect, less attention has been paid to this issue. The present study i MoreIn recent years, the use of plants for soil remediation has been of much interest. Much effort has been put into lab work to obtain experimental data, but despite the great importance of theoretical aspect, less attention has been paid to this issue. The present study is an effort to investigate the theoretical and mathematical concepts governing this process. Basic definitions are presented briefly. Also, the governing mechanisms are discussed. After presenting the continuity and mass transfer equations, first the validity of the obtained equations is verified in a real example with experimental data. Then, the equations are solved numerically and the results are studied and discussed. The findings show that variables such as root length (as an index of plant species), humidity, soil texture and the other parameters, which appear in the equations, affect the process. Moreover, by the proper selection of plants, the operation provided a model which can predict the result of phytoremediation. Manuscript profile -
Open Access Article
34 - Study of photocatalytic decomposition of reactive colorants from textile wastewaters: finite elements numerical modeling and experimental results
Khashayar Badii Faramarz Doulati Ardejani Seyed Zia-e-din Shafaei Tonekaboni Niaz Mohammad Mahmoodi Farrokh Legha AminiWastewaters containing reactive colorants from different industries can be harmful to the environment. Therefore, it is so important to remove colorants from wastewater before they are discharged into the environment. In this research, a simple mathematical model expand MoreWastewaters containing reactive colorants from different industries can be harmful to the environment. Therefore, it is so important to remove colorants from wastewater before they are discharged into the environment. In this research, a simple mathematical model expanded by finite elements method has been proposed which is capable of simulating the process of colorants removal from industrial wastewaters. The proposed model has been solved by a combination between SEEP/W and CTRN/W software. The model was examined by an example. The example was a study on transportation modeling of a pollutant in a porous media water flow by two analytical and numerical solutions. After the calibration of the model, its results were compared with those of an experimental research for decolorization of Reactive Orange 107 (a Cibacron colorant) by photocatalytical process (UV/TiO2/H2O2) at a batch reactor in laboratory scale. The results showed good prediction by the model. The experimental results showed that Cibacron colorants, such as Reactive Orange 107, would be mineralized by the photocatalytic process (UV/TiO2/H2O2). Although, the production of these types of wastewater is almost unavoidable, a suitable environmental management program can be developed to minimize the effects of these pollutants. Manuscript profile -
Open Access Article
35 - Estimation the risk-neutral processes in jump–diffusion models of gold coin future contracts in Iran Mercantile Exchange
Nahid Malekiniya hosein asgari aloujEstimation the risk market prices and the functions of the stochastic processes of the model are necessary in commodity derivatives pricing. When a closed-form solution is unclear, estimating of the risk market price is a main question in the jump–diffusion models MoreEstimation the risk market prices and the functions of the stochastic processes of the model are necessary in commodity derivatives pricing. When a closed-form solution is unclear, estimating of the risk market price is a main question in the jump–diffusion models. This paper along with Gomez's, Habibilashgari's and Rodriguez's review (2016) is suggested to estimate the functions of the risk-neutral processes directly from market data of Iran. In this approach, there is no need to estimate the physical drift and the risk market prices of coin future contracts pricing. This research estimates the risk-neutral drifts, volatilities and parameters of the jump range distributions with Iran Mercantile Exchange data of the coin future contract , from 2010 to 2017. The findings show that JDM and DM under price the futures prices and the prices obtained with the JDM are closer to the observed prices than those obtained with the DM. For the longest maturities the JDM provides smaller errors than the DM. The higher the maturity, the higher the differences between the two models. Manuscript profile -
Open Access Article
36 - presenting a model to optimize liquidity measures in tehran stock exchange
Alireza Fatemi Iraj Noravesh Farhad Hanifi Mani Sharifiliquidity is a fundamental aspect of stock market efficiency and in terms of methodology , most of the theories related to the structure of financial markets account for the implications of liquidity behavior more than other market characteristics . therefore , the cent Moreliquidity is a fundamental aspect of stock market efficiency and in terms of methodology , most of the theories related to the structure of financial markets account for the implications of liquidity behavior more than other market characteristics . therefore , the central role of market liquidity in the form of prices , and reducing the costs and risks of sustainable development and stability of financial systems is important , so liquidity issue has attracted much attention in recent years in academic studies as well as in important publications . in this research , the criteria of each liquidity type are introduced and the relationship between them is studied . in fact , the main question of this research is what measure is the criterion for the selection of liquidity in tehran stock exchange . the purpose of this thesis is to evaluate and compare liquidity capability and design a model for explaining liquidity measures in tehran stock exchange with emphasis on 11 different measures . for this purpose , a sample of eight firms listed in tehran stock exchange ( tse ) during the period 1380 to 1389 were reviewed . to achieve the goal of this research , factor analysis - vikor 's numerical algorithm which is one of multi - criteria decision making methods is used . Manuscript profile -
Open Access Article
37 - An Efficient Numerical Algorithm For Solving Linear Differential Equations of Arbitrary Order And Coefficients
S. Hatamzadeh-Varmazyar Z. Masouri -
Open Access Article
38 - روش عددی صریح برای سیستمهای دینامیک غیرموضعی با تأخیردر زمان بر پایه درونیابی اسپلاین مربعی
حسن پنج مینی بهروز پارسا مقدم الهام هاشمی زادهدر این مقاله، روشی صریح برای حل عددی معادلات دیفرانسیل غیرموضعی با تأخیر در زمان ارائه و مورد بررسی قرار می گیرد. در روش ارائه شده، درونیابی اسپلاین مربعی بکار گرفته شده است و خطای روش ارائه شده آنالیز گردیده است. کارایی و اعتبار روش پیشنهادی در مدلهای آیکدا و هاتچینسو Moreدر این مقاله، روشی صریح برای حل عددی معادلات دیفرانسیل غیرموضعی با تأخیر در زمان ارائه و مورد بررسی قرار می گیرد. در روش ارائه شده، درونیابی اسپلاین مربعی بکار گرفته شده است و خطای روش ارائه شده آنالیز گردیده است. کارایی و اعتبار روش پیشنهادی در مدلهای آیکدا و هاتچینسون غیرموضعی تأخیری با استناد مفاهیم خطا و همگرایی روشهای عددی به ازای مقادیر مختلف پارامترهای مرتبه کسری نمایان شده است. Manuscript profile -
Open Access Article
39 - بکارگیری ماتریس عملیاتی جدید برای حل معادلات انتگرال کسری غیرخطی
فائزه سالکی رضا عزتیدر این مقاله یک روش عددی برای حل معادلات انتگرالی کسری غیر خطی (NFIE) بر اساس توابع پایه ی جدیدی که در مرجع ]16[ معرفی شده است، ارائه می گردد. ابتدا، ماتریس های عملیاتی تعمیم و بهبود داده شده تا بتواند مناسب انتگرال های کسری گردند. به کمک انتگرال گیری دقیق، ماتریس Moreدر این مقاله یک روش عددی برای حل معادلات انتگرالی کسری غیر خطی (NFIE) بر اساس توابع پایه ی جدیدی که در مرجع ]16[ معرفی شده است، ارائه می گردد. ابتدا، ماتریس های عملیاتی تعمیم و بهبود داده شده تا بتواند مناسب انتگرال های کسری گردند. به کمک انتگرال گیری دقیق، ماتریس های مذکور به صورت پارامتری بدست می آیند. سپس، روش حل تشریح و بر روی معادلات انتگرالی غیر خطی اعمال می شوند. همچنین، تحلیل خطا صورت گرفته و مرتبه ی همگرایی بدست می آید. علاوه بر آن، مثال های عددی متعددی به ازای مقادیر بازه ی گسترده ای از مرتبه ی کسری بودن معادله و نیز توان جمله های غیر خطی ارائه می گردد. مقایسه ی نتایج با حل دقیق و نیز با نتایجی که در مطالعات پیشین گزارش شده اند توانایی، دقت قابل توجه و نیز برتری روش حاضر را نسبت به روش های مشابه نشان می دهد. Manuscript profile -
Open Access Article
40 - تاثیر سطح مقطع بر روی اختلاط سیالات در میکرومیکسرهای مارپیچ؛ روش عددی
توحید دهقانی رضا پیرخوش قیافه پریسا بالازاده فرهاد صادق مغانلومیکرومیکسرها بخش مهمی از سیستمهای میکروسیالات هستند. در کار حاضر، اختلاط در سه سطح مقطع بررسی شده است. در اثر تولید گردابه های دین، شاخص اختلاط ۹۹ درصد در طول کوتاهتری از میکرومیکسر ودر رینولدز ۱۰ بدست آمده است. همچنین در مقایسه با سطح مقطع های مثلثی و دایره ای س Moreمیکرومیکسرها بخش مهمی از سیستمهای میکروسیالات هستند. در کار حاضر، اختلاط در سه سطح مقطع بررسی شده است. در اثر تولید گردابه های دین، شاخص اختلاط ۹۹ درصد در طول کوتاهتری از میکرومیکسر ودر رینولدز ۱۰ بدست آمده است. همچنین در مقایسه با سطح مقطع های مثلثی و دایره ای سطح مقطع مستطیلی راندمان بهتری دارد. Manuscript profile -
Open Access Article
41 - Stagnation-point flow of a viscous fluid towards a stretching surface with variable thickness and thermal radiation
B. C. Prasanna ‎Kumara ‎‎G. K‎. ‎ ‎Ramesh‎ A. J. Chamkha‎ B. J. ‎Gireesha‎‎ -
Open Access Article
42 - Non-Newtonian thermal convection of eyring-powell fluid from an isothermal sphere with biot number effects
S. Abdul ‎Gaffar‎ V. Ramachandra Prasad E. Keshava Reddy -
Open Access Article
43 - A Piecewise Approximate Method for Solving Second Order Fuzzy Differential Equations Under Generalized Differentiability
E. Ahmady N. Ahmady -
Open Access Article
44 - MHD boundary layer heat and mass transfer of a chemically reacting Casson fluid over a permeable stretching surface with non-uniform heat source/sink
B. J. Gireesha‎ B. Mahanthesh‎ M. M. Rashidi‎ -
Open Access Article
45 - Two-phase Boundary Layer Flow, Heat and Mass Transfer of a Dusty Liquid past a Stretching Sheet with Thermal Radiation
K. L. Krupa ‎Lakshmi‎ B. J. ‎Gireesha‎ Rama S R Gorla B. Mahanthesh‎ -
Open Access Article
46 - On Optimal Quadrature Rule for Solving Fuzzy Fredholm Integral Equations
R. Ezzati M. M. Sadatrasou -
Open Access Article
47 - Poetic Measures in Modern Poetry
Ahmad Zakeri Fatemeh Bafghi ZadehKHKJKHKJ Manuscript profile -
Open Access Article
48 - Physical and Numerical Investigations of Gas Turbine Blades Failure
H.R. Faridi A. Momeni M. Mohammadpour V. Sarfarazi -
Open Access Article
49 - 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
50 - Studying the Shear and Discharge Rate of Proteins in Microfluidic Junctions, Under Electrokinetic EffectsStudying the Shear and Discharge Rate of Proteins in Microfluidic Junctions, Under Electrokinetic Effects
Babak kamali Doust Azad Sasan Asiaei Borhan Beigzadeh -
Open Access Article
51 - Numerical simulation of multilayer cellular scaffolds with 3D and 1D elements
Hamid Reza khanaki Sadegh Rahmati Mohammad Nikkhoo Mohammad Haghpanahi Javad Akbari -
Open Access Article
52 - Direct Kinematics Solution of 3-RCC Parallel Robot using a Semi-Analytical Homotopy Method
Seyyed Mojtaba Varedi-Koulaei Masoumeh Rahimi -
Open Access Article
53 - Fabrication, Testing and Analysis of Composite Lattice Panels Under Three-Point Bending Load
Mahdi Farhadi Ali Davar Mohsen Heydari Beni Jafar Eskandari JamThanks to their high strength-to-weight ratio, lightweightness, and excellent energy absorption, composite lattice panels can be used in the aerospace, marine, automotive, and other industries. These structures can be used as an alternative to string-reinforced structur MoreThanks to their high strength-to-weight ratio, lightweightness, and excellent energy absorption, composite lattice panels can be used in the aerospace, marine, automotive, and other industries. These structures can be used as an alternative to string-reinforced structures, honeycomb (core) sandwich panels, and aluminum grid structures. In this paper, a composite lattice panel is first fabricated from glass/epoxy by hand lay-up method using a silicon rubber mold. In this method, a Kagome composite lattice panel with twelve layers of resin-impregnated fibers was fabricated during a continuous process. After fabrication, the test panel was shown under three-point bending and failure modes. Also, a numerical simulation of three-point bending was performed in ABAQUS software. Then, the simulation results were compared with those of the experimental test, indicating a good convergence between the experimental test results and the finite element ones up to the point of failure. Due to changes in directions of force, these structures have a high ability to withstand damage, and therefore, continue to withstand the load after the failure of one or more ribs. Also, there is no sudden and sharp drop in the load-bearing capacity of the structure despite the force being maximized, which can be attributed to the high energy absorption of such structures. Instead, the force decreases slowly with fluctuations, and the structure continues to absorb energy until final failure. Therefore, such lightweight structures can be used in applications where energy absorption is of great importance. Manuscript profile -
Open Access Article
54 - 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
55 - 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
56 - 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
57 - 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
58 - The Effect of Magnetic Nanoparticles on Dynamic Behavior of Aorta Artery with Atherosclerosis Under the Action of Pulsating Blood Velocity
M.R Motaghedifar A Fakhar H Tabatabaei M Mazochi -
Open Access Article
59 - A Modified Model to Determine Heat Generation in the Friction Stir Welding Process
A Ghiasvand S Hasanifard M Zehsaz -
Open Access Article
60 - Investigation of Stress State of the Layered Composite with a Longitudinal Cylindrical Cavity
V. Yu Miroshnikov -
Open Access Article
61 - Study of the Mechanical Behavior of Municipal Solid Waste Landfill Using a Viscoplastic Constitutive Model
R Slimani D Dias B Sbartai L Oxarango -
Open Access Article
62 - Numerical and Experimental Analysis of Impact and Damage on Composite Sandwich Panels with Grid-Stiffened Core
J Faraji Shoaa A Davar J Eskandari Jam M Heydari Beni -
Open Access Article
63 - Dynamic and Quasi-Static Plastic Behavior of Single and Nested Thin-Walled Square Tubes Under Lateral Loading
B Shabani S Gohari Rad A Alijani R Rajabiehfard -
Open Access Article
64 - 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
65 - Numerical and Experimental Study on Ratcheting Behavior of Steel Cylindrical Shells with/without Cutout Under Cyclic Combined and Axial Loading
M Shariati K Kolasangiani H.R Epakchi H Chavoshan -
Open Access Article
66 - Numerical and Experimental Study on Ratcheting Behavior of Plates with Circular Cutouts under Cyclic Axial Loading
K Kolasangiani M Shariati Kh Farhangdoost A Varvani-Farahani -
Open Access Article
67 - A Second-Order Accurate Numerical Approximation for Two-Sided Fractional Boundary Value Advection-Diffusion Problem
Elyas Shivanian Hamid Reza Khodabandehlo -
Open Access Article
68 - Using the Finite Differences Method for the Fredholm Integral Equations of the Second Kind
Nooshin Pashmakian Ali Farajzadeh نورالدین پرندین -
Open Access Article
69 - A Numerical Approach for Solving Forth Order Fuzzy Differential Equations Under Generalized Differentiability
E. Ahmadi N. Ahmadi -
Open Access Article
70 - Application of iterative Jacobi method for an anisotropic diusion in image processing
M. Knanian A. DavariImage restoration has been an active research area. Dierent formulations are eective in high qualityrecovery. Partial Dierential Equations (PDEs) have become an important tool in image processingand analysis. One of the earliest models based on PDEs is Perona-Malik m MoreImage restoration has been an active research area. Dierent formulations are eective in high qualityrecovery. Partial Dierential Equations (PDEs) have become an important tool in image processingand analysis. One of the earliest models based on PDEs is Perona-Malik model that is a kindof anisotropic diusion (ANDI) lter. Anisotropic diusion lter has become a valuable tool indierent elds of image processing specially denoising. This lter can remove noises without degradingsharp details such as lines and edges. It is running by an iterative numerical method. Therefore, afundamental feature of anisotropic diusion procedure is the necessity to decide when to stop theiterations. This paper proposes the modied stopping criterion that from the viewpoints of complexityand speed is examined. Experiments show that it has acceptable speed without suering from theproblem of computational complexity. Manuscript profile -
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71 - توسعه همزمان مدل عددی و هوش مصنوعی جهت شبیهسازی جریان بر روی سرریزهای جانبی
عباس پارسائی امیر حمزه حقی آبی شادی نجفیانمدلسازی عددی پدیده های هیدرولیکی از مهمترین بخشهای علم مهندسی هیدرولیک است. مدل سازی عددی معمولاً شامل حل معادلات دیفرانسیل حاکم بر جریان و همچنین تخمین ضرایب موجود در این معادلات می باشد. در مدل سازی عددی هیدرولیک جریان عبوری از بعضی از سازه های مورد استفاده در Moreمدلسازی عددی پدیده های هیدرولیکی از مهمترین بخشهای علم مهندسی هیدرولیک است. مدل سازی عددی معمولاً شامل حل معادلات دیفرانسیل حاکم بر جریان و همچنین تخمین ضرایب موجود در این معادلات می باشد. در مدل سازی عددی هیدرولیک جریان عبوری از بعضی از سازه های مورد استفاده در مهندسی آب، مانند سرریزهای جانبی نیاز به حل همزمان معادلات دیفرانسیل و تخمین ضریب شدت جریان می باشد. سرریزهای جانبی یکی از انواع سرریزهایی است که به طور وسیعی در انواع پروژه های مهندسی آب مورد استفاده قرار می گیرد. معادله حاکم بر هیدرولیک سرریزهای جانبی معادله متغیر مکانی می باشد که یک معادله دیفرانسیل معمولی است که ضریب شدت جریان نیز در آن حضور دارد. مطالعه بر روی مشخصات هیدرولیکی این نوع سازه به دو قسمت برآورد پروفیل سطح آب و تخمین ضریب دبی تقسیم می شود. حل معادله دیفرانسیل هیدرولیک سرریز جانبی منجر به برآورد پروفیل سطح آب عبوری از روی این سازه می شود. برای مدل سازی ضریب شدت جریان نیز نیاز است که از روش های پرقدرتی مانند انواع مدل های هوش مصنوعی استفاده شود. در این تحقیق با توجه به اهمیت موضوع، برای مدل سازی عددی هیدرولیک سرریز جانبی معادله جریان متغیر مکانی با استفاده از روش رانج کوتای مرتبه چهار حل گردیده و برای تخمین ضریب شدت جریان به توسعه مدل هوش مصنوعی شبکه عصبی تطبیقی (ANFIS) پرداخته شده است. خروجی مدل عصبی تطبیقی به عنوان یکی از ورودی های مدل عددی بشمار میرود. نتایج کلی نشان می دهد که مدل نهایی که از ترکیب دو مدل هوش مصنوعی و مدل عددی تشکیل شده است از توانایی بسیار مناسبی جهت شبیه سازی هیدرولیک این سازه برخوردار می باشد. Manuscript profile -
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72 - شبیهسازی جریان عبوری از شیر پروانهای با استفاده از نرم افزار فلوئنت (مطالعه موردی: سد تنگوئیه به گل گهر سیرجان )
مجتبی ابراهیمی رضا محمد پوردر سیستم های انتقال آب، شیرها یکی از مهمترین اجزا هستند که به عنوان واحد ایمنی و همچنین کنترل کننده جریان (قطع و وصل جریان و تنظیم مقدار جریان عبوری) در آرایش بندی های مربوط به خطوط انتقال آب مورد استفاده قرار می گیرد. در این تحقیق با توجه به وجود حوضچه های متعدد در خط Moreدر سیستم های انتقال آب، شیرها یکی از مهمترین اجزا هستند که به عنوان واحد ایمنی و همچنین کنترل کننده جریان (قطع و وصل جریان و تنظیم مقدار جریان عبوری) در آرایش بندی های مربوط به خطوط انتقال آب مورد استفاده قرار می گیرد. در این تحقیق با توجه به وجود حوضچه های متعدد در خط لوله انتقال آب سد تنگوئیه به شرکت صنعتی و معدنی گل گهر سیرجان شیر پروانه ای مورد استفاده در این حوضچه ها با استفاده نرم افزار فلوئنت مورد شبیه سازی قرار گرفته است. شرایط شبیه سازی در این تحقیق به این شرح می باشد: مدل استفاده شده در شبیه سازی مدل k-ε در حالت Standard است، به منظور بررسی اثر دیواره ها تابع Standard Wall Function برای تمامی حالات، انتخاب روش PISO برای کوپل فشار- سرعت و روش Standard برای گسسته سازی ترم فشار و برای گسسته سازی ممنتوم، روش Power Law، و شرط مرز ورودی در ورودی لوله برابر فشار ورودی معادل 14 بار انتخاب شد. خصوصیات جریان مانند سرعت، فشار و آشفتگی در حالت های بازشدگی مختلف مورد بررسی قرار گرفته است. نتایج جریان نشان می دهد که سرعت در محل دریچه ها هنگام باز و بسته شدن دریچه افزایش می یابد در بررسی فشار نیز مشاهده شد با بسته شدن شیرها فشار در محل دریچه شیرها کاهش می یابد. همچنین مشاهده شد فشار پشت دریچه در دو حالت منفی می شود. نتایج حاصل از بررسی تلاطم نشان داد بیشترین تلاطم را در شیر پروانه ای در بازشدگی 70 درجه می توان مشاهده کرد. در دبی مشخص و ثابت در دو شیر های پروانه ای، برای بدست آوردن بهترین شرایط مرزی، انواع شرایط مرزی جریان ورودی و خروجی استفاده شد. مرزهای ورودی شامل مرز فشار ورودی و مرز سرعت ورودی میباشند. Manuscript profile -
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73 - شبیهسازی یک بعدی آبشویی رسوب در مخازن سدها
روزبه آقامجیدیکنترل رسوبات در مخازن سدها، یکی از موضوعات مهم در مدیریت مخازن سدها بوده و موجب افزایش تأثیر در جهت افزایش عمر مفیدآنها میکردد. مخازن سدها به عنوان یک مانع، باعث تله اندازی رسوب، با راندمان بالا شده واز انتقال رسوب به رودخانه پایین دست، جلوگیری میکند. افزایش مق Moreکنترل رسوبات در مخازن سدها، یکی از موضوعات مهم در مدیریت مخازن سدها بوده و موجب افزایش تأثیر در جهت افزایش عمر مفیدآنها میکردد. مخازن سدها به عنوان یک مانع، باعث تله اندازی رسوب، با راندمان بالا شده واز انتقال رسوب به رودخانه پایین دست، جلوگیری میکند. افزایش مقدار رسوبات در مخزن، باعث کاهش عمر مفید سدها و نیز کاهش استفاده از آنها میگردد. برای تخلیه قسمتی از رسوبات مخزن، روشهای مختلفی مورد مطالعه قرار می گیرد. آبشویی رسوب درمخزن سد، به علت استفاده از انرژی جریان آب و نیز عدم نیاز به منبع انرژی اضافی، (مانند لایروبی) در مخازن مختلف سراسر دنیا مورد استفاده قرار گرفته است و از اولین کزینهها در مدیریت و بهره برداری از سدها و مخازن می باشد. دراین مقاله یک مدل ریاضی یک بعدی با جریان یکنواخت، در مورد آبشویی رسوب در مخزن سد، مورد مطالعه قرار کرفته است. این مدل با فرض داشتن پروفیل اولیه رسوب و نیز حل معادله پیوستگی رسوب و بر اساس روش تفاضلهای محدود تهیه شده است و توانایی محاسبه پروفیل رسوب با زمان را دارد. هم چنین مقدار حجم رسوبات شسته شده و نیز حجم آب مخزن با گامهای زمانی متفاوت در این مدل، محاسبه میگردد. این مدل برای دادههای آزمایشگاهی و دادههای واقعی مورد ارزیابی قرارگرفت. نتایج حاصل در مقایسه با مقادیر واقعی، در حد رضایت بخشی بود. لازم به ذکر است که هم گرایی حاصل از تکرار در مدل پس از 40 بار تکرار با خطای کمتر 0.00001روی داد. مقایسه نتایج این مدل با نتایج مدل HEC-6، مزیت این مدل وضعف مدل HEC-6، را در پیشبینی پروفیل بستر فرسایش یافته در اثر ابشویی هیدرولیکی نشان میدهد. مدل HEC-6، معمولا جهت بررسی حرکت یک بعدی جریان رسوبات در مخازن و رودخانهها، استفاده می گردد. Manuscript profile -
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74 - تاثیر استغراق خروجی تخلیهکننده تحتانی بر میزان هوادهی بین دو دریچه اضطراری و سرویس در سدهای بلند
مهدی جورابلو مهدی فولادی پناه فاطمه ناصری حامد سرکرده مرتضی ماروسیاستفاده از تونل های تخلیه کننده تحتانی به منظور تخلیه و نیز تنظیم سطح آب مخزن از اهمیت بسیار زیادی در مدیریت عملکرد سد برخوردار هستند. میزان بازشدگی دریچه سرویس و دریچه اضطراری در تونل ها نقش مهمی در تغییرات فشار، سرعت و ضریب آبگذری و در نهایت عملکرد تونل دارند. در این Moreاستفاده از تونل های تخلیه کننده تحتانی به منظور تخلیه و نیز تنظیم سطح آب مخزن از اهمیت بسیار زیادی در مدیریت عملکرد سد برخوردار هستند. میزان بازشدگی دریچه سرویس و دریچه اضطراری در تونل ها نقش مهمی در تغییرات فشار، سرعت و ضریب آبگذری و در نهایت عملکرد تونل دارند. در این تحقیق میزان هوادهی جریان بین دریچه سرویس و اضطراری در دو مدل فیزیکی سد کارون 4 و قیزقلعه سی با شرایط پایاب آزاد و مستغرق مورد بررسی قرار گرفت. در این راستا ضریب هوادهی برای هر مدل به صورت آزمایشگاهی اندازه گیری شد. همچنین به منظور بررسی نوسانات فشار حاصل از جت خروجی از دریچه ها در محل حوضچه آرامش، شبیه سازی عددی به کمک نرم افزار Flow3D انجام شد. نتایج نشان داد که استغراق خروجی اثر کاهنده به میزان 50 درصد بر هوادهی جریان دارد. این بدان معنی است که چنانچه تخلیه کننده در خروجی مستغرق باشد، امکان رخداد پدیده کاویتاسیون بیشتر خواهد بود و در نتیجه نیاز به سازه هوارسان با ابعاد بزرگتر می باشد. همچنین مشاهده شد با انجام هوادهی در جت میزان نوسانات در کف حوضچه کاهش پیدا می کند و امکان رخداد کاویتاسیون نیز از بین می رود. Manuscript profile -
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75 - 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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76 - شبیه سازی عددی انتشار آلودگی در رودخانهها بوسیله توسعه همزمان روش عددی حجم محدود و مدل شبکه عصبی تطبیقی
عباس پارسائی محمد مهدی احمدی کوروش قادریمطالعه بر روی کیفیت آبهای سطحی از اهمیت ویژهای برخوردار است. این موضوع با توجه به اینکه یکی از مهمترین منابع تأمین آب برای مصارف شرب، کشاورزی و صنایع، رودخانهها هستند نیاز به توجه بیشتری دارد. متأسفانه رودخانهها گاهی به عنوان مکانی برای تخلیه فاضلاب در نظر گرفته می Moreمطالعه بر روی کیفیت آبهای سطحی از اهمیت ویژهای برخوردار است. این موضوع با توجه به اینکه یکی از مهمترین منابع تأمین آب برای مصارف شرب، کشاورزی و صنایع، رودخانهها هستند نیاز به توجه بیشتری دارد. متأسفانه رودخانهها گاهی به عنوان مکانی برای تخلیه فاضلاب در نظر گرفته می شوند. به همین دلیل آلودگی رودخانهها به یکی از مهمترین مسائل و مشکلات در محیط زیست تبدیل شده است. معادله حاکم بر انتشار آلودگی در رودخانه ها، معادله انتقال و پخش است که از نوع معادلات دیفرانسیل جزئی میباشد. این معادله از پرکاربرد ترین معادلات در مهندسی سیالات مخصوصا مهندسی آب میباشد و به صورت کلی معادله حرکت نامیده میشود. در توسعه مدل های کامپیوتری جهت شبیه سازی انتشار آلودگی در آبراهه ها علاوه بر حل عددی معادله حرکت، نیاز به پیش بینی ضریب پخشیدگی نیز میباشد. برای محاسبه ضریب پخش فرمول های تجربی فراوانی ارائه شده است که ارزیابی این روابط نشان می دهد اکثر این معادلات دارای دقت مطلوب نمی باشد. به همین جهت استفاده از روش های هوش مصنوعی اجتناب ناپذیر است. در این مقاله برای گسسته سازی معادله حرکت از روش حجم محدود استفاده و برای تخمین ضریب پخشیدگی شبکه عصبی تطبیقی (ANFIS) توسعه داده شده است. نتایج مدل ANFIS توسعه داده شده نشان می دهد که مدل تهیه شده در مراحل مختلف توسعه مانند آموزش و آزمایش برای تخمین ضریب پخشیدگی از توانایی بسیار مناسبی برخوردار می باشد( و ) بعد از توسعه مدل هوش مصنوعی به توسعه کلی مدل کامپیوتری پرداخته شده است دقت مدل کامپیوتری با حل تحلیلی معادله حرکت و همچنین داده های مشاهداتی رودخانه سورن در انگلستان مورد بررسی قرار گرفت. مقایسه نتایج مدل ارائه شده با دادهای اندازه گیری شده رودخانه سورن در ایستگاه های مورد مطالعه به ترتیب دارای دقتی( و و ) می باشد. نتایج کلی نشان می دهد که مدل کامپیوتری توسعه داده شده از توانایی بسیار مناسبی جهت شبیه سازی انتشار نیز آلودگی در رودخانه ها برخوردار میباشد. Manuscript profile -
Open Access Article
77 - Numerical study on nanofluid natural convection in a vacuum tube solar collector with phase change materials
seyed Alireza Nazem Iman ZahmatkeshAs an eternal and widespread energy source, solar energy has a low density while its intensity is changing continuously. Unavailability of the solar energy in nights and the gap between the time of radiation and its consumption are concerned as the main drawbacks of thi MoreAs an eternal and widespread energy source, solar energy has a low density while its intensity is changing continuously. Unavailability of the solar energy in nights and the gap between the time of radiation and its consumption are concerned as the main drawbacks of this type of energy. In applications such as domestic hot water (DHW), phase change materials (PCMs) can successfully remove this shortcoming due to their high thermal capacity and constant temperature during the phase change process. However, thermal conductivity of water is relatively low which reduces the performance of vacuum tube solar collectors. This properties can be improved substantially with the utilization of nanofluids. This paper presents a numerical study on nanofluid natural convection in a vacuum tube solar collector with phase change materials. The studied nanoparticles include copper oxide, titanium oxide, iron oxide, aluminum oxide, and graphene oxide. The obtained results show that for all of the current nanoparticles, rise in the nanoparticles volume fraction is accompanied by a decrease in the exit temperature of the collector. It is found that the highest temperature belongs to the graphene oxide nanoparticles. Manuscript profile -
Open Access Article
78 - Logical designing of yield pillar base on coal pillars yielding process
Kazem Oraee Navid HosseiniThe longwall mining method is one of the best methods for exploitation of underground horizontalto near horizontal coal layers. The high production and safety are the typical advantages. Entriesof both sides longwall panel having important role in product and safety. Wi MoreThe longwall mining method is one of the best methods for exploitation of underground horizontalto near horizontal coal layers. The high production and safety are the typical advantages. Entriesof both sides longwall panel having important role in product and safety. With increasing depth ofmine, difficulty of supporting condition of entries increases. One of the basic solutions for suchentries stability, particularly at deep mines, is to use yield chain pillars. Since, the behavior of coalpillar at post-peak regime is not known, so the logical designing of these yield chain pillars are notwell established.In this paper, two strain-softening models with numerical and analytical fundamentals areanalyzed. These models are studied for a row of yield chain pillar at longwall mining system at700 m dept of surface ground. In this study, only development phase of longwall mining system iscontemplated while the deformation, yielding and failure possibility are considered beforelongwall operation runs. Results show in deep longwall mine yield chain pillar can be used. Inaddition, both analyzed strain-softening models, having required potential for rather optimumunderstanding of pillar yielding behavior. Therefore, could be a base for yield pillar logical design.Study development shows this approached yield pillar design is sensitive to pillar behavior aftercoal peak strength. In addition, due to two-dimensional modeling, front abutment load influencecould not be evaluated Manuscript profile -
Open Access Article
79 - Design of pillars size in under ground mines by ground reaction curve method
Kamran Goshtasbi Shobeir ArshadnejadMining methods are mainly depending on physical and geometrical structure of ore bodies. Room &pillar mining is very important in underground mining methods. Because of it is simplicity, highproduction and low cost of operations. Room & pillar method includes so MoreMining methods are mainly depending on physical and geometrical structure of ore bodies. Room &pillar mining is very important in underground mining methods. Because of it is simplicity, highproduction and low cost of operations. Room & pillar method includes some intersecting tunnels in orebody, for stability of these tunnels, some parts of ore body must remain in the form of columns or socalled pillar. Designing of the pillars is very important for increasing of the performance anddecreasing of ore loss. Hence many empirical formulae are presented for designing of the pillars, butbased on limited data. In fact, the particular restriction of each formula limits its application in variousconditions and ore bodies. In this paper a new method is suggested for determination of optimumpillars design in various conditions by numerical modeling and ground reaction curve. By this methodall of rock mass geomechanical and geometrical characteristics can be considered for designing of thepillars. This new method is based on ground reaction curve by making 18 models in 30, 40 and 50meters depth with different width to height ratio (W/h) of the pillar. Each of the resulted curves inlinear part which states the elastic behavior of rock mass determines the desirable width to height ratio(W/h). An Underground salt rock mine (Soltan abad’s mine) was selected for validating of thesuggested method. The W/h for stable pillars in the mine is between 1.3 and 1.6. The result obtained ofground reaction curves is 1.375 for W/h which showing the accuracy of suggested method. Manuscript profile -
Open Access Article
80 - Numerical modeling of soil bearing capacity coefficients under earthquake load
Pezhman Fazeli سهیل GHorehEvaluation of soil bearing capacity coefficients of has been the focus of a significant amount of studiesby various researchers. In all conducted studies and analyses, by considering different forms ofearthquake load with pseudo-static performance, different results hav MoreEvaluation of soil bearing capacity coefficients of has been the focus of a significant amount of studiesby various researchers. In all conducted studies and analyses, by considering different forms ofearthquake load with pseudo-static performance, different results have been obtained. In this research,evaluation of soil bearing capacity coefficients under earthquake load has been carried out using finiteelements software Plaxis and the obtained results have been compared with those from other publishedstudies. Moreover, the effect of the inertia of the underpinning soil on the soil bearing capacitycoefficients was modeled in the pseudo- static mode and the results indicated that bearing capacitycoefficients obtained from pseudo-static gave good agreement with other methods. However,comparison of these two results revealed that the results obtained from numerical modeling are moreconservative and are on the safety side. Finally, since the pseudo –static load is not characterized as anappropriate alternative for the earthquake load; the effect of underpinning soil on the manner oftransferring the earthquake waves until reaching the foundation bed has been also investigated.Evaluation of soil bearing capacity coefficients of has been the focus of a significant amount of studiesby various researchers. In all conducted studies and analyses, by considering different forms ofearthquake load with pseudo-static performance, different results have been obtained. In this research,evaluation of soil bearing capacity coefficients under earthquake load has been carried out using finiteelements software Plaxis and the obtained results have been compared with those from other publishedstudies. Manuscript profile -
Open Access Article
81 - Representing a modern method to tunnel stability analysis with introducing a new scheme for Ground Reaction Curve (GRC); case study: Garin dam water Diversion tunnel
S.M Hoseini کاوه Ahangari کامران GoshtasbiThe most important problem in tunneling project about design and performance is selectionsuitable pattern for drilling and support system, in order to stability of rock mass and reductionplasticity zone. Meanwhile determine the amount of tunnel wall deformation prior to MoreThe most important problem in tunneling project about design and performance is selectionsuitable pattern for drilling and support system, in order to stability of rock mass and reductionplasticity zone. Meanwhile determine the amount of tunnel wall deformation prior to supportinstallation is of great importance. When a tunnel is excavated, there is a certain amount ofdeformation, usually 35-45 percent of the fnal tunnel wall deformation, before the support canbe installed. Determining this deformation can be done using either a) observed feld values, orb) numerically from 3D fnite-element models or symmetrical fnite-element models, or c) byuse of empirical relationships such as those proposed by Panet or Vlachopoulos-Diederichs. Inthis paper, convergence-confnement method is applied to tracing ground characteristic curveusing numerical software models and then stress relaxation is exerted to modal that equivalentwith occurred critical convergence until prior to support installation. In this study, a new chartis introduced which unlike conventional charts, the modulus reduction flow has been used inthat vertical axis. Finally the safety factor of support system has been calculated by three different methods. Manuscript profile -
Open Access Article
82 - Numerical modeling of segmental lining of Golab water conveyance tunnel due to reduced environmental impact
mehdi saneiaraei meisam hakimianbidgoli mohamadamin vashadi araeiLack of proper drinking water is a major problem in the Central and Eastern cities of the country. Therefore, the necessity of water transmission projects are posed and since meeting these needs using traditional methods are very difficult, time-consuming and costly; so MoreLack of proper drinking water is a major problem in the Central and Eastern cities of the country. Therefore, the necessity of water transmission projects are posed and since meeting these needs using traditional methods are very difficult, time-consuming and costly; so the mechanized excavation of tunnels and segmental lining are used. The water transferred through the pipes has significant surface destruction. That would result in serious environmental problems. Also, transferring water through the pipes is more expensive than the tunnel. In this paper, after introducing all procedures of segments design, segmental lining of Golab water conveyance tunnel using finite element was modeled. Firstly, loads on segmental lining was determined by UDEC software after installation in tunnel. Then, these amounts of load on the segments used for modeling was applied in ABAQUS software. Results obtained by 3D modeling software showed that the greatest amount of displacement of segments under different stress conditions concerns to the bottom segment. Based on the performed modeling, due to the high compressive stress, the crack is only seen in segment concrete and these results are totally in compliance with Golab tunnel segments observations. Manuscript profile -
Open Access Article
83 - Estimating the Loss of Life of the Electrical Power Transformer based on TOT and HST
Mohammad Tolou Askari Mobina Afagh -
Open Access Article
84 - 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
85 - 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
86 - 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
87 - 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
88 - Numerical Solution and Evaluation of Variation Power and Efficiency of Conventional and moving regenerator of Beta-type Stirling Engine In the case of Adiabatic with Exchangers Ideal
Alireza Ahmadpour nader rahbar hadi kargar sharifabadThe purpose of this research was to develop a thermodynamic model for engine via changing the form of regenerator. In conventional beta-type Stirling the working fluid passes between the compression and expansion space via the bypass of the main cylinder. In the present MoreThe purpose of this research was to develop a thermodynamic model for engine via changing the form of regenerator. In conventional beta-type Stirling the working fluid passes between the compression and expansion space via the bypass of the main cylinder. In the present study a new form of regenerator was proposed for the beta-type Stirling engine. In this new form successive homogeneous layers of sguare wire meshes filled the space of displacer piston so that the displacer piston took the role of regenerator and displacer simultaneously. To this end modeling was done using MATLAB software and the obtained results were compared with the published values. Manuscript profile -
Open Access Article
89 - 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
90 - 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
91 - Numerical analysis of the effects of a common and porous fin on the heat transfer rate and distilled water production in a solar desalination
Reza Shaabani Hadi Kargar SharifabadDue to the fresh water shortage crisis in all around the world, many types of desalination systems have been developed. One of the most used type of them is solar desalination system. In this paper, a parametric study has been employed for investigation of the effects o MoreDue to the fresh water shortage crisis in all around the world, many types of desalination systems have been developed. One of the most used type of them is solar desalination system. In this paper, a parametric study has been employed for investigation of the effects of mounting a normal and porous fin on the heat transfer and water production rates of solar still desalination. A fin with different porous intensity in different positions has been put in solar desalination. For modelling the mentioned desalination, the desalination geometry has been meshed and the 3D simulation has been performed using ANSYS Fluent software. As the result of simulation, putting fin in optimum position in a solar still desalination leads to considerable increment of Nusselt number which results in increase of mass transfer and fresh water production rates. In addition, employment of porous fin will cause decrease in heat transfer and mass transfer rates. Finally, the effects of adding fin on the vortexes in the desalinator and its impacts on temperature and mass fractions differences in various zones has been also examined. Manuscript profile -
Open Access Article
92 - 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
93 - 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
94 - A Clay Bullae and Five Tablets From Tepe Sofalin, Rey Plain, Iran
Morteza Hessari Rouhollah Yosefi -
Open Access Article
95 - Analysis of Factors that Influence Automobile Workshop Queue Performance Using Design of Experiments
Welly Sugianto Reazul Haq Abdul Haq -
Open Access Article
96 - Numerical Simulation of the Segmental Tunnels Performance in the Swelling Rocks
Arash Jeddi Rouzbeh Dabiri -
Open Access Article
97 - 3D Analysis of Improved Soft Ground with a Group of Floating of Stone Columns Laid on the Appropriate Bed
Mohammad Shabani Mehdi Hatami Hasan Golmaee Saman Arechi -
Open Access Article
98 - Numerical Parametric study of Geosynthetic-Gabion Walls under Different Surcharge Loads
Mahmoud Khalatbari Abolfazl Rezaeipour Rashid Hajivand Dastgerdi Mehran Ghannad Sahand Shokri -
Open Access Article
99 - Assessment of Soil cohesion of Soils on Tunnel Excavation
Mohammad Azadi -
Open Access Article
100 - Deformation Performance of the Karkheh Earth Dam with Mixed and Pure Clay Coreunder Seismic Excitations
Majdedin Mir Hosseini R. Bahrami M. AsadolahiPajouh -
Open Access Article
101 - Soil-Interaction of Intake Pressure Tunnels under Ground Strength Reduction Conditions due to Cracking of the Lining (Case study: Dasht-e-Abbas intake pressure tunnel)
seysd majddin Mir Mohammad Hosseini P Malek Mohammadib M. Asadolahi Pajouhc -
Open Access Article
102 - The Stability Assessment of Dasht-e-Abbas Pressure Intake Tunnel Subjected to Ground Strength Reduction-Iran
S. M Mir Mohammad Hosseini P Malek Mohammadi M Kargar -
Open Access Article
103 - Numerical Modeling of the Effect of Geocell Elements’ Dimensions on Behavior of Circular Footings
Soheil Ghareh -
Open Access Article
104 - The Behavior of Suction Bucket under Cyclic Loading in Saturated Lands
Seyed.Majdedin Mir Mohammad Hosseini M. Emdadi Far T.S. Mir Mohammad Hosseini -
Open Access Article
105 - Earth Pressure behind an Integral Bridge Abutment and Comparison with that behind a Conventional Bridge Abutment under Traffic Loads
Fatemeh khatibi Seyed Majddin Mir Mohammad Hosseini -
Open Access Article
106 - An Investigation on the Behavior of Retaining Structure of Excavation Wall Using Obtained Result from Numerical Modeling and Monitoring Approach. (A Case Study of International "Narges Razavi 2 Hotel", Mashhad)
Soheil Ghareh Mehdi Saidi -
Open Access Article
107 - Buckling of Stiffened Thin Walled Cylindrical Shells due to Global Shear
Mehran seyedRazzaghi F. Karimi -
Open Access Article
108 - Numerical Solution of Seismic Wave Propagation Equation in Uniform Soil on Bed Rock with Weighted Residual Method
M.H. Jahangir -
Open Access Article
109 - Determining the Likelihood of Damage in Concrete and its Physical Structure
leila Shahryari -
Open Access Article
110 - The Effect of Lower Detachment Zone on Buckle Folds Geometry
O Barani -
Open Access Article
111 - Vortex-induced energy harvesting of an elliptic blade in high-Reynolds lid-driven cavity flow
Ali Akbar Hosseinjani Ghasem Akbari -
Open Access Article
112 - The Effect of Self-monitoring of Attention Training on Mathematical Problem Solving of Elementary Male Students with a Learning Disability in Math
Fatemeh Seyyedi Rahim BadriThis study was aimed to investe the effect of self- monitoring of attention training on math performance of students with a math disability. The pretest – posttest control group design was used. The participants consisted of 50 fifth grade students with a learning MoreThis study was aimed to investe the effect of self- monitoring of attention training on math performance of students with a math disability. The pretest – posttest control group design was used. The participants consisted of 50 fifth grade students with a learning problem in math who were selected from among the elementary school students in Khoy. They were randomly assigned to two experimental and one control groups. Diagnostic tests of mathematical learning disability (Key Math.), mathematical problem solving test and Raven' children intelligence test were used to collect the data. The results were analyzed the using ANCOVA. The results indicated that the students with math disability in the experimental group who received self- monitoring of attention training achieved higher scores in solving verbal math problems and numerical calculations in the posttest than the ones in the control group. Manuscript profile -
Open Access Article
113 - The Effect of Teaching Math through UCMAS Method on Mental Development of Children Aged 5 to 12 in Tabriz
Farah Pak Oskouei Jahangir YariThe present study sought to investigate the effect of teaching math through UCMAS method on mental development of children aged 5 to 12 in Tabriz. The design of the study was pretest posttest with control group. The research population included all primary students at t MoreThe present study sought to investigate the effect of teaching math through UCMAS method on mental development of children aged 5 to 12 in Tabriz. The design of the study was pretest posttest with control group. The research population included all primary students at the age of 5 to 12 in Tabriz in the academic year 2013-2014 from which , 60 students (30 in the experimental group and 30 in the control group) were selected through cluster sampling. Then, both groups took the pre-test. The experimental group was taught math through UCMASA method. To collect the data, Gobaribonab et al's mathematical problem solving test, Wechsler's numerical Memory Scale, and Abedi's logical mathematical intelligence scale were used. The reliability of the problem solving, numerical memory, and logical-mathematical tests were 0.92, 0.88, and 0.67 respectively. The validity of the test was at a desired level. The analysis of covariance was used for analyzing the data. The results showed that teaching through UCMAS improves problem solving numerical memory, and logical -mathematical intelligence in children. Therefore, teaching math through UCMAS can enhance mathematical skills and abilities in children Manuscript profile -
Open Access Article
114 - Evaluating ecological capability for urban development using multi-criteria decision making models (Case Study: Ardabil Province)
kolsum yarmohammadi zahra khodabakhshi amin nazarpoorAbstract One of the main stages of land use is the ecological capability of the land. Since it is impossible to limit the development of cities, they should be tailored to meet the needs of today and tomorrow, so that environmental damage can not be avoided. The purpose MoreAbstract One of the main stages of land use is the ecological capability of the land. Since it is impossible to limit the development of cities, they should be tailored to meet the needs of today and tomorrow, so that environmental damage can not be avoided. The purpose of this study is to assess the ecological capability of Ardabil province for urban development. . In this research, the zoning of the ecological capability of Ardabil province has been done by combining the fuzzy model and Shannon entropy, and then, using numerical taxonomy, priority has been given to environmental power in Ardabil province, in five optimal, favorable, moderate , Weak and very weak power of the region for sustainable urban development. The use of multi-criteria models, including fuzzy inference and the production of maps that are close to reality, can effectively assist in the identification of lands for the establishment and development of the city of Ardabil province. The results of this study showed that in both methods (fuzzy and taxonomic), northern parts of the province are suitable regions to the most suitable, the southern parts are inadequate, parts of the eastern parts are moderate to suitable and inappropriate western parts. According to the findings, the areas are very convenient 12.22%, suitable for 18.27%, 20.20%, inappropriate 25.13%, and very inappropriate 23.26% of the province. The results of the research can be of great help in locating the cities appropriately to prevent environmental crises and make sustainable and sustainable use of the Manuscript profile -
Open Access Article
115 - Numerical Analysis of surface Ozone and its relation to synoptic patterns in Tehran
Ali Afshariazad Bahman Ramezani atoosa bigdeli mohammadreza afshariazadThis research tries to assess the emission and concentration of surface Ozone related to the synoptic weather patterns in general circulation of atmosphere. 2020 – 2021 is the time and Tehran is the place of this research. Based on the defined scenarios, the extre MoreThis research tries to assess the emission and concentration of surface Ozone related to the synoptic weather patterns in general circulation of atmosphere. 2020 – 2021 is the time and Tehran is the place of this research. Based on the defined scenarios, the extreme emission day, the pure day accompanied with stability and instability of the atmosphere, air pressure in sea level and 500 hpa. Skew-T chart from Mehrabad airport were analyzed. The emission datum was taken from the six stations of the air quality control organization in Tehran. The analysis was done daily and seasonally. The result of the research shows that in 24 hours emissions the most concentration happens in the mid-day and last until 6 in the evening. Among the seasons, summer has the most concentration because of the dominance of high pressure in atmosphere, increase in surface temperature high radiation and wind speed. More than 6 m Manuscript profile -
Open Access Article
116 - 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
117 - Urban Development Leveling of the Cities in Bushehr Province Using Numerical Taxonomy Model
gholamreza moradi Mahsa DehghanianAssessing the level of development of communities has been a concern for regional planners in all countries. The use of quantitative criteria for the classification of settlements leads to understanding the level of inequality between residential areas and provides a me MoreAssessing the level of development of communities has been a concern for regional planners in all countries. The use of quantitative criteria for the classification of settlements leads to understanding the level of inequality between residential areas and provides a measure to reduce and eliminate these inequalities. To address regional imbalances, regions need to be identified and classified based on their level of development in different areas. The aim of this research is to identify disadvantaged areas and plan for reducing intra-regional disparities to achieve balanced development. In this study, 12 indices have been selected within the framework of numerical taxonomy analysis to assess the level of development and classify the counties of Bushehr Province. The research method used in this study is descriptive-analytical. Based on this classification, Bushehr with a development coefficient of 0.01382 is the most developed city, while Jam with a coefficient of 0.724444 is identified as the most disadvantaged city in the province. The results of this research indicate a center-periphery pattern dominating the spatial structure of Bushehr Province. Manuscript profile -
Open Access Article
118 - Numerical Simulation of Homogeneous, Two and Three Lattice Layers Scaffolds with Constant Density
Hamid Khanaki Sadegh Rahmati Mohammad Nikkhoo Mohammad Haghpanahi Javad Akbari -
Open Access Article
119 - The Recommend of Filler Metal to Increasing the Corrosion Resistance of Gas Pipeline
Esmaeil Jafari Mohammad Sadegh Karimi -
Open Access Article
120 - 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
121 - Investigation of Effective Plastic Strain Heterogeneity and the Effect of Using Interface Sheet in Constrained Groove Pressing of Copper Sheet
Moein Gholami Ali Hasanabadi -
Open Access Article
122 - Design and Fabrication of a Longitudinal-Torsional Ultrasonic Transducer
Yahya Radi Najafabadi Reza Nosouhi Frahad Sajajid -
Open Access Article
123 - Investigation of the dynamic response of the subsea transmission pipeline under explosion impact using experimental and numerical methods
Hamid nasiri mohammad asadian ghahferokhi Madjid Ghodsi Hassanabad amin bahmanpourSea and high seas are very important, which can be considered in two aspects. On the one hand, the seas have economic, commercial, logistical, military, and geopolitical advantages, in addition, they pave the way for increased maritime diplomacy. In addition to these ad MoreSea and high seas are very important, which can be considered in two aspects. On the one hand, the seas have economic, commercial, logistical, military, and geopolitical advantages, in addition, they pave the way for increased maritime diplomacy. In addition to these advantages, the harsh natural conditions at sea, such as the presence of high waves, tsunamis, sea ice, as well as ammunition and unused military equipment buried under water left over from the First and Second World Wars, also from the imposed war, which could impose a lot of potential human and financial risks due to explosions. In this paper, using the Abaqus finite element software, the dynamic response of a cylindrical tube buried in the sea subjected to the explosion is investigated applying numerical and experimental methods. Finite element models based on the experimental models were examined and the numerical results were compared with the experimental data. The results indicated that the maximum impact wave pressure, bubble propagation duration and displacement due to the cylinder deformation in the experimental and finite element analysis were well compatible Manuscript profile -
Open Access Article
124 - A Study of the Seismic Behavior of Special Steel Moment Resistancewith the Use ofDouble and Reverse Arc-Shaped Fuse on the Beam Flange
Aboozar saleh seyyed mehdi zahraei seyyed rasool Mir ghaderiUnexpected brittle failure in steel rigid frameconnectionsby concentrated tensions on the welded area and connectionvulnerability in high ductility demands as occurred during the Northridge (1994) and Kobe (1995)has challenged ductility properties and ability to absorbs MoreUnexpected brittle failure in steel rigid frameconnectionsby concentrated tensions on the welded area and connectionvulnerability in high ductility demands as occurred during the Northridge (1994) and Kobe (1995)has challenged ductility properties and ability to absorbseismic energy in this type of structural system. So in design of this type of structural system, creating ductility and ability to withstand cyclic large deformations is important. On this basis, in present study two new beam-to-column moment connections with reduced beam section by double orreverse arc-shaped fuseare studied in capacity design approach. The arc-shaped fuse, by removing flange and a part of web and replacing double orreverse arc-shapedin the section bending of the beam, resulted in a ductile fuse away from beam-to-column connections components, which prevents connection vulnerability in high ductility demands. The purpose has been numerically studied byfournumericalmodelsunder cyclic load using ABAQUS 6.10 finite element software. Obtained numerical results were compared with those of other studies. The numerical results show that arc-shapedfuse creates ductile fuses faraway from beam-to-column connectioncomponents and can satisfy acceptance conditions of special moment resistance connection based on AISC and FEMA. The arc-shaped fusecan increase drift story capacity up to 8% without any significant strength loss through increasing the out-of-plane stiffness of the beam longitudinal axis against lateral-torsional buckling.According toelasticflexural strengthandstiffnessof beam criteria,the reversearc-shaped fuseisabetter choicethan double arc-shaped fuse. Manuscript profile -
Open Access Article
125 - Evaluation of Reinforced Concrete Frames with Steel & Concrete X-Shape Brace Strengthened with CFRP under Cyclic Loads
ahmad rahbar ranji mohammad pasalariThe choice of lateral forces resistance system type depends on the composition of the loading, structural behavior, gravity loads transition to the base, architectural design, geometric dimensions, building code restrictions, the amount of lateral forces, the maximum di MoreThe choice of lateral forces resistance system type depends on the composition of the loading, structural behavior, gravity loads transition to the base, architectural design, geometric dimensions, building code restrictions, the amount of lateral forces, the maximum displacement and, etc. Today, the use of concrete dual frames has become very common in many modern structures, including high-rise buildings and building retrofitting. In this study, RC frames with X-shaped steel braces and Concrete X-Shape braces Strengthened with CFRP under Cyclic seismic loading have been investigated. Initially an RC frame in 3 manners such as RC frame, RC frame with concrete X-shaped braces and RC frame with X-shaped steel braces previously tested by Haddad et al. (2015) modeled and analyzed in ABACUS finite element software. Then the results of numerical analysis and laboratory study were compared. The results were fairly well-matched. Finally, after verification of the ABACUS software results, the proper composition of the carbon fiber reinforced polymer (CFRP) retrofitting was studied, and the load-displacement hysteresis diagrams, load-displacement and final load ratios for the proposed samples were compared. Manuscript profile -
Open Access Article
126 - Investigation of the Girth Size and intervals Effect on Lateral Buckling Strength of Built-up Double I & C-Sections Columns
jaber hemayati ahmad rahbar ranji Steel composite columns with parallel girth are one of the common types of columns used in steel structures in the country (IRAN). Despite many studies on the behavior of these columns, the impact dimensions and spacing of girth on t More Steel composite columns with parallel girth are one of the common types of columns used in steel structures in the country (IRAN). Despite many studies on the behavior of these columns, the impact dimensions and spacing of girth on the buckling load of these columns have been less considered. In addition to resistance criteria, in designing of pressure members, the stability criteria must also be considered. In other words, the pressure members of a structure will be defeated effectively by local buckling before reaching maximum compressive strength or influence of buckling phenomenon. The local buckling is one of the common instability of structural members and is an important factor in design of the Built-up columns, so the buckling phenomenon of these columns must be strongly controlled. In this research, 10 columns by double I sections and 6 columns by double C sections were analyzed by different intervals of girths. All column sections are double IPE140 or UNP140. Dimensions of the girth in double I sections are 100×180 mm, with thickness of 4, 6 and 8 mm, by intervals axes to axes 400, 600 and 800 mm in both side. Dimensions of the girth in double C sections are 100×140 mm, with thickness of 4 and 6 mm, by intervals axes to axes 400, 600 and 800 mm in both side. Finally, the elastic buckling load of these columns was obtained by using the Abacus finite element software and compared with the relationships in the tenth chapter of the National Building Regulations. Manuscript profile -
Open Access Article
127 - Investigating the efficiency of modified element-free Galerkin method in solving static problems and optimization
Ramin Vafaei Poursorkhabi Ali Zareh Alireza Alizadeh Majdi Fariba Behrouz SarandThe finite element method has been used comprehensively in traditional and academic works. The common finite element method is a powerful method in solving boundary value problems that transforms strong differential form equations into weak form equations using domain d MoreThe finite element method has been used comprehensively in traditional and academic works. The common finite element method is a powerful method in solving boundary value problems that transforms strong differential form equations into weak form equations using domain discretization. Even though the finite element method has sufficient accuracy in displacements, but calculating the stress field by FEM has low accuracy. This paper uses the modified element-free Galerkin method to solve some numerical elastostatics problems. At first, a one-dimensional elastic bar is considered, which is subjected to a volumetric force with linear changes along the length of the bar. A comparison between the original element-free Galerkin method, the modified element-free Galerkin method and the exact solution has been made to check the accuracy, efficiency and the required time cost. The presented study indicates that these mentioned methods have the same accuracy, but the modified EFG method can be very time-consuming compared to others, mainly when a large number of degrees of freedom is used with a large size of the support domain. The numerical solution of the modified and original element-free Galerkin methods is compared with Timoshenko’s analytical responses for the bending of an elastic beam. This comparison exhibits that modified and original methods have excellent agreements with the analytical ones in calculating displacement values. Despite the same accuracy in estimating the displacements, the calculation of the stress field indicates that the modified method is less accurate than the original method. It is shown that by increasing the number of degrees of freedom, the accuracy of the modified method for estimating the stress field improves. Increased degrees of freedom are used for introducing the domain of the beam. In this study accuracy of the stress solution in the modified EFG method is improved. However, the modified EFG method is yet more time-consuming than others. According to the results, the modified element-free Galerkin method can be nominated as a powerful mesh-free method based on moving least squares that has shape functions with interpolation properties. Having interpolator shape functions in this method makes it possible to combine it with other numerical methods and apply boundary conditions with less computational cost. The results exhibit that the displacement calculation error in the presented method was at most 5% compared to the analytical solution method. Also, the maximum error rate in the presented method for stress estimation was equal to 15%. Manuscript profile -
Open Access Article
128 - Investigating the effect of panel zone rigidity on behavior of tubular web reduced beam section connections
aboozar saleh aboozar saleh amir mahdi heydari tafreshiConcentrated major stresses in area of beam-to-column welded connections of steel moment frames have been proposed in the high density demands as a critical factor in connection vulnerabilities. Reducing the stress concentration in the connections can be accompl MoreConcentrated major stresses in area of beam-to-column welded connections of steel moment frames have been proposed in the high density demands as a critical factor in connection vulnerabilities. Reducing the stress concentration in the connections can be accomplished with the intentionally weakening of the cross section of the beam connected to the column. By this method, the plastic hing is formed in the weakened section and the demand is included on the connecting components. In this study, the effect of the panel rigidity on the behavior of the beam connection with the reduced bending strength section with the tube has been investigated. Eight connections of various thicknesses have been investigated. Connections are analyzed using finite element modeling under static loading. In this research, it is observed that with increasing the thickness of the web panel zone, the loss of the strength curve decreases and the connection experiences more drift. Also by increasing the thickness the von mises stress in the panel zone decreased. The values of stress and displacement were observed in the tube web in larger thicknesses are bigger. The failure of the column and the connection panel zone in the connections decreased with the increase of the connection panel zone thickness. The lowest energy dissipation is related to the weakest panel zone connection. By increasing the thickness of the panel zone connection, it would be expected that more energy would be lost from the connection. In general, according to the results obtained in this study, application of thickness less than the calculated value in seismic design is not recommended. Manuscript profile -
Open Access Article
129 - Numerical Analysis of Post-Tensioned Steel Moment Connections with Top and Seat Angles
rohollah ahmadi jazani peyman Shadman heydari mehdi amriiTo reduce or eliminate residual deformations in the main members of the structures after an earthquake, researchers presented the idea of using self-centering systems. Several types of self-centering systems have been proposed.One of the strategies for created self cent MoreTo reduce or eliminate residual deformations in the main members of the structures after an earthquake, researchers presented the idea of using self-centering systems. Several types of self-centering systems have been proposed.One of the strategies for created self centering in structures, using post-tensioned(PT) steel moment connections. Until now several types of PT steel connections is provided. In this paper, results of numerical analysis using finite element method in ABAQUS software for five full-scale model of interior PT steel connections with bolted top and seat angles has been studied. The results of numerical analysis in this research demonstrate the beams and columns remain essentially elastic while inelastic deformation of the top and seat angles provided energy dissipation and also using post-tensioning method, increase loading capacity significantly without residual deformation in main members of the connection. In a PT connection, maximum stresses in beam created at the flange of beam and using longer reinforcing plate, cause decrease stresses created in beam and reduce various damage index and risk of brittle fracture in tension angles.Cyclic behavior of numerical model of PT connection with combined axial load and drift demand shows that the axial load reduces bearing capacity of connection. Manuscript profile -
Open Access Article
130 - Numerical investigation of the perimeter Wall Behavior under blast Loading with the approach of protecting structures and facilities
yaser moeini ahmad ganjali Mohammad TajiBy increasing the risk of explosive terrorist attacks and threats to all types of structures and buildings, a careful study of the behavior of structures under explosive loading is considered as an important matter. A simple method to protect important structures agains MoreBy increasing the risk of explosive terrorist attacks and threats to all types of structures and buildings, a careful study of the behavior of structures under explosive loading is considered as an important matter. A simple method to protect important structures against explosive loads is to improve the security of the environment by using protective perimeter walls against explosive loading. In this research, the effect of reinforced concrete perimeter walls with and without canopy has been investigated. Different parameters such as the geometrical shape of the perimeter wall, the element removal and degradation rate, wall displacement, the scaled distance change and the explosive mass have been investigated. Finite element software (LS-DYNA (R11.1.0) has been used for modeling. For this purpose, the perimeter walls were designed in three different shapes and conditions. The results indicate that the existence of canopies for the perimeter walls under explosive loading has positive effects, so that the canopied perimeter walls with a canopy angle of 90 degrees compared to other types of wall, at different station distances and in the same conditions, reduce the displacement rate in the protected structure by about 11 percent. Furthermore, the location of perimeter walls and obtaining a safe distance in placing these walls is very effective in enhancing safety and reducing the vulnerability of the facilities and structures protected by these walls. Manuscript profile -
Open Access Article
131 - Settlement Analysis Of Embankment Dams with Numerical Analytics Geo_ Slope
kamal rahmani Saber piroti Arasto ArmaganiThe first thing that is vital in the modern embankment dams Construction, it is the correct and monitoring of the geotechniqual constructions. From the experimental results in this work is determination of rules that can help us in performing of the future works. Now, i MoreThe first thing that is vital in the modern embankment dams Construction, it is the correct and monitoring of the geotechniqual constructions. From the experimental results in this work is determination of rules that can help us in performing of the future works. Now, it is considered that inverted analysis method is a very useful tool for understanding the behavior of dam in the hand of engineeres. By investigation of data and using inverted deciding in construction of dams. In this paper monitoring of Mahabad dams With using acculate tools information and numerical analytic has considered. In performing of numerical analytic, it is used by Geo Slope Software package that is a analytic software base on finite element method. By helping in convey of data and performing inverted analysis, condition of Mahabad embankment dams has analysed. While it is more than thirty years form the dams, in the beginning of the construction of this dam, has considered the unusul settlements and horizontal displacements. As foundation settlement up to ending of performing operation (from 1344 to 1348), has measured 125 cm and during exploitation (from 1349 to 1376), has measured 70 cm. From the time of construction, the maximum settlement and horizontal displacement are measured 140 cm and 110 cm respectively. After construction cutoff walls and finishing operation injection in foundation of dam, rate of seepage from foundation is decreased too and according to the numerical calculations in negligible extent is (0.04 centimeter cube in minute) and rate of seepage in body dam is (7.5 centimeter cube in minute). Manuscript profile -
Open Access Article
132 - Evaluation of Flexural Performance of Steel I-Beams Prestressed with Unbounded Bar Tendons by Numerical Analysis Method
Afshin Yadegari rasool khodayari mohammad ali lotfollahi YaghinThe basic purpose of applying the Prestressing technique in steel structures, weight decrease of sections because of is increase their load-carrying capacity that this eventually led to the realization of technical and economic advantages of such structures are. In this MoreThe basic purpose of applying the Prestressing technique in steel structures, weight decrease of sections because of is increase their load-carrying capacity that this eventually led to the realization of technical and economic advantages of such structures are. In this paper, prestressing method in steel I-beams, as post-tensioning of the external tendons installed in various samples of steel beams, to determine the increase of flexural strength and improve of load capacity, is analysis and evaluation by the finite element software of ABAQUS. Considering the existence of experimental results in this study, and comparison between these results and analysis done for each of the samples, among them a suitable corresponded can be observed and applying the prestressing technique, Flexural behavior of beams in the form of indicators such as stress, strain and displacement bottom flang of the beem in the mid-span, are all significantly to be improved. Manuscript profile -
Open Access Article
133 - An Optimization Method on Hyperbolic Indicator
Reza Fallah-Moghaddam -
Open Access Article
134 - An Optimization Function On Depreciation of Assets
Reza Fallah-Moghaddam -
Open Access Article
135 - Investigation of the Effect of Geometric Parameters on Head of the Morning Glory Spillway
Majid Ehsani ali akbar salehi neyshabouriBased on the water surface elevation, there is three types of flow control: flow control at the spillway crest, flow control at the shaft and flow control at the top of the shaft tunnel. In the following research, Flow3D software used for numerical modeling and the resu MoreBased on the water surface elevation, there is three types of flow control: flow control at the spillway crest, flow control at the shaft and flow control at the top of the shaft tunnel. In the following research, Flow3D software used for numerical modeling and the results were compared with experimental work, and good agreement was observed. Also, discharge - head graph is plotted for morning glory spillway, which shows by increasing the head, control point moves from the crest to the vertical shaft and then to downstream tunnel. In the case of complete submergence, significant changes in the head are observed with a low increase in flow rate. A parametric study has been done on the length of the vertical shaft and elbow radius. the results show the direct effect of these changes on head of the crest morning glory spillway, so that by increasing the length of the shaft, at a specified discharge increase head on crest, also by increasing the radius of the elbow, the head height on the crest reduced after the submergence elbow of morning glory spillway. Manuscript profile -
Open Access Article
136 - Investigation Effective Factors On Energy Depreciation Of Stepped Spillways
saeed razmara Abbas mansoriIn recent decades, stepped spillways have been a significant role in this case.. This research is based on The flow energy calculated on these edged steps and simple steps in nappe flow and skimming flow regimes. Difference in height, width and edge slopes will determin MoreIn recent decades, stepped spillways have been a significant role in this case.. This research is based on The flow energy calculated on these edged steps and simple steps in nappe flow and skimming flow regimes. Difference in height, width and edge slopes will determine the effects of each of these parameters on energy dissipation ratio And then the analysis of sixteen model with different geometries were conducted by Gambit and Fluent software for two discharges ٣/٦ lit/s (nappe flow) and ٢٥ litr/s (skimming flow) by the total of ٣٢ models. And with regard to the results achieved, the influence of the edge for nappe flow has been regarded according to Chamani and Rajaratnani equations. With regard to the results, it is suggested that the existence of the edge at the step end can be enhanced the energy dissipation ratio along the stepped chute. Of course the ratio of this effect in flow and skimming regimes are not the same and these effects are decreased by increasing of discharge. Manuscript profile -
Open Access Article
137 - Investigating the Effect of Distance and Diameter Ratios of Spindle Shape Stands on the Amount of Force Generated by Waves in the Base Group in a Regular Arrangement
Mohammad Ghatarband Mehdi Behdarvandi AskarIn this research, in order to optimize the marine structures through changing their shape and distances, the force in each of the base group columns was investigated. In the present thesis, the shape of spindle was used for the cross section of the columns because the s MoreIn this research, in order to optimize the marine structures through changing their shape and distances, the force in each of the base group columns was investigated. In the present thesis, the shape of spindle was used for the cross section of the columns because the spindle shape has a better hydrodynamic quality when encountering waves. Moreover, the shape was investigated more closely in four vertex angles encountering waves with the 30°, 45°, 60°, and 90° angles. Afterwards, each of these spindle shapes were investigated in five different equal longitudinal and latitudinal distances with the results being presented in diagrams in the present paper. These five distances presented as dimensionless ratios S/D include 1.8, 2.9, 4, 5.5, and 9. The results indicate that the amount of force is directly proportional to the vertex angle, and inversely proportional to the columns' distance from each other. Manuscript profile -
Open Access Article
138 - Temperature Variations Modeling in the Persian Gulf Using the Numerical Model of POM
Seyed Majid MosaddadTemperature, Salinity and density are as some of physical properties of sea water often varying there. Thermocline is a property as temperature varying in water column and having variations in terms of time and space. Study and investigation of existence and developing MoreTemperature, Salinity and density are as some of physical properties of sea water often varying there. Thermocline is a property as temperature varying in water column and having variations in terms of time and space. Study and investigation of existence and developing trend with seasonal variations conduct the researcher to some information about inter fluid events. Numerical methods have errors and approximations. Predicted values will be closer to real ones depending on more knowledge about influence of present forces and effective factors on the problem; so little errors happen in numerical study. Of course it is helpful to predict results for different time periods in suitable time and so compete them with measured values for evaluation of the results in the case study zone. In this research running a numerical model during a 6 months period from winter using measured values of temperature (ROPME 1992), and applying initial and boundary conditions, also effective factors on physical conditions variations in the zone, summer temperatures are resulted; Therefore formation and development of thermocline will be studied. In fact, development of thermocline from Strait of Hormuz to northwest of the Persian Gulf (Arvand river estuary) has been investigated by numerical modeling of temperature variations as dominant parameter. Manuscript profile -
Open Access Article
139 - Temperature Variations Modeling in the Persian Gulf
Seyed Majid MosaddadTemperature, Salinity and salinity are as some of physical properties of sea water often varying there. Thermocline, is a property as temperature varying in water column and having variations in terms of time and space. Study and investigation of existence and developin MoreTemperature, Salinity and salinity are as some of physical properties of sea water often varying there. Thermocline, is a property as temperature varying in water column and having variations in terms of time and space. Study and investigation of existence and developing trend with seasonal variations conduct the researcher to some information about inter fluid events. Numerical methods having errors and approximations, and predicted values will be closer to real ones that it is related to more knowledge about influence of present forces and effective factors on the problem.Therefore, little errors happens in numerical study. Of course it is helpful to predict results for different time periods in suitable time and so compete them with measured values for evaluation of the results in the case study zone. Running a numerical model, Princeton, during a 6 months period from winter using measured values of temperature, and applying initial and boundary conditions, also effective factors on physical conditions variations in the zone, summer temperatures are resulted and so formation and development of thermocline will be analyzed. In fact, development of thermocline from strait of Hormuz to Northwest of the Persian Gulf (Arvand river estuary) has been investigated. Manuscript profile -
Open Access Article
140 - Investigation of maximum scour depth in compound structure of weir-gate due to gate opening using FLOW-3D numerical model
behnam namadian Ebrahim AsadiThe flow and drainage structures are widely used in irrigation and drainage networks due to their simple and relatively precise relationships. The flow causes the return of water and consequently increases the flow cross section and decreases the speed and also creates MoreThe flow and drainage structures are widely used in irrigation and drainage networks due to their simple and relatively precise relationships. The flow causes the return of water and consequently increases the flow cross section and decreases the speed and also creates suitable conditions for sediment deposition and waste in the water, which is considered as a disadvantage of this structure. With the accumulation of sediments upstream, the flow conditions are changed and the accuracy of the extracted relationships is reduced to estimate the discharge. By combining the flow and valve, it is possible to reduce the problems and disadvantages of using each one alone and at the same time use their advantages so that the depositable materials behind the flow and accumulator in the hatch entrance pass through the substructure. Rhine, the combined behavior of spillway flow with jet out from under the hatch, creates different conditions downstream of such structures and causes scour changes downstream of this. The overall purpose of this study was to investigate the effect of valve opening rate on scouring rate in the case of discharge through the combined structure, upstream head height using flow-3D numerical model.The results show that by reducing the opening of the valve, the height of the water on the structure increases and causes the scour depth to increase. Also, by increasing the flow rate over the spillway and under the valve and the height of the upstream water, the maximum scour depth increases. Manuscript profile -
Open Access Article
141 - Ranking the Developing of Rural Districts in Ardabil Province based on Numerical Taxonomy Model
J. Jafarzadeh H. Rostamzadeh ایرج KhoshbakhtanUsing criteria and methods of classification in ranking settlement in the spatial system of the regions, on the one hand, resulted in recognition of the amount of inequality in settlement parts and on the other hand, it is considered as a criteria to reduce and eliminat MoreUsing criteria and methods of classification in ranking settlement in the spatial system of the regions, on the one hand, resulted in recognition of the amount of inequality in settlement parts and on the other hand, it is considered as a criteria to reduce and eliminate existing inequalities among them. In order to solve the problems caused by the lack of the region balance, the first step is identifying and ranking regions in terms of enjoying technology in the fields of social and economic services. In this study, by employing eight index to study developing in the framework of Analyzing Numerical Taxonomy (NTA) action was taken to ranking the degree of developing rural districts in Ardabil province. Method of this study is descriptive-Analytic. Population in the present study were all of 69 rural districts in Ardabil province. At this ranking, Kalkhoran rural district of the central part of Ardabil county and eastern Qeshlaqdasht rural district of part of Qeshlaqdasht in Bilehsavar county by developing coefficient 0.3 and also 0.96 were identified the most enjoyed and the most deprived rural districts of the province, respectively. On the basis of this research, the center-around model is governed on the spatial structure of the rural districts in Ardabil province. Manuscript profile -
Open Access Article
142 - A Comparative Study of the Development of Urban Areas in Rasht by Using Multi Criteria Evaluation Methods
Alireza danesh nasrollah molaei akbar motamedimehrLack of resources and facilities in urban areas makes essential the efficiency assessment of areas. So, resources should be allocated in such a way that most services can be offered through existing resources. To identify the development or underdevelopment of areas, it MoreLack of resources and facilities in urban areas makes essential the efficiency assessment of areas. So, resources should be allocated in such a way that most services can be offered through existing resources. To identify the development or underdevelopment of areas, it is necessary to study inequalities patterns and differences between them, and also, studying the degree of superiority of one place compared to the structure of similar locations in the city. The recognition of the existing differences among different areas in the city in terms of enjoyment of various indicators, in order to be aware of the development or deprivation levels, reduce regional disparities and set programs in accordance with the conditions and facilities of each area is an unavoidable necessity. In this study, attention has been paid to determining and ranking the degree of development of urban areas in Rasht based on 63 indicators in five educational, health care, socio-cultural, economic-commercial, and urban civil installations. To achieve the objectives of the study, the Numerical Taxonomy model, Morris Model and TOPSIS model have been used. By applying these models and analysis, each of the five areas of Rasht city, the ranking and the level of development of each area has been determined separately. The results of the study show that more facilities and services have been focused on the city center. Therefore, inequality in five areas is observed with significant difference. As such, in analyzing all three models, areas one and two have more favorable situation, but area five is of the most deprived regions. In fact, the farther the areas are from the center of the city, the lower facilities and services they will receive. This is the result of polar policies growth, as a result of which, all of the facilities and power are concentrated on one or more areas, and other areas act as marginal. Due to the nature and the difference in method of ranking the indexes, degree of development of study areas in each model is different from the other model. In order to achieve the same result in the assessment of development areas, percentage of changes, intensity of changes, and coefficient of variation were calculated and the results were extracted based on the divided indicators. - Manuscript profile -
Open Access Article
143 - رتبهبندی و سطح توسعهیافتگی با توجه به شاخصهای کشاورزی مطالعه موردی: منطقه سیستان
Ali Sardar Shahraki Javad Shahraki Seyed Arman Hashemi Monfaredمنطقه سیستان یکی از مهمترین مناطق کشاورزی در استان سیستان و بلوچستان می باشد. از این­رو با توجه به ناهمگنی در بخش کشاورزی و دانستن این تفاوت­ها، هدف از این پژوهش، بدست آوردن سطح توسعه­یافتگی کشاورزی در منطقه سیستان می­باشد. برای این منظور، از دو رو Moreمنطقه سیستان یکی از مهمترین مناطق کشاورزی در استان سیستان و بلوچستان می باشد. از این­رو با توجه به ناهمگنی در بخش کشاورزی و دانستن این تفاوت­ها، هدف از این پژوهش، بدست آوردن سطح توسعه­یافتگی کشاورزی در منطقه سیستان می­باشد. برای این منظور، از دو روش تحلیل سلسله مراتبی فازی (FAHP) و تاکسونومی عددی با در نظر گرفتن 20 شاخص مهم در بخش کشاورزی این منطقه، استفاده گردید. اطلاعات مورد نیاز از طریق تکمیل پرسشنامه از کارشناسان خبره و سالنامه­های آماری در بخش کشاورزی بدست آمد. هم­چنین برای تجزیه و تحلیل اطلاعات از ترم افزارهای Matlab وSPSS استفاده شد. نتایج مدل تاکسونومی عددی نشان داد که بخش­های مرکزی، شیب آب و پشت آب جزء بخش­های کمتر توسعه­یافته هستند و بخش­های میانکنگی و جزینک در رده بخش­های توسعه­نیافته قرار دارند. هم­چنین نتایج تکنیک تحلیل سلسله مراتبی فازی (FAHP) حاکی از بود که بخش­های مرکزی، پشت آب و شیب آب در رتبه­های اول توسعه­یافتگی از لحاظ شاخص­های کشاورزی در منطقه قرار دارند و بخش­های جزینک و میانکنگی در رتبه های چهارم و پنجم جای گرفتند. لذا به طور کلی، مشخص می­شود که منطقه سیستان از لحاظ سطح توسعه­یافتگی کشاورزی در وضعیت نامناسبی قرار دارد. در این راستا پیشنهاد می­گردد برنامه ریزی مناسب جهت ارتقاء سطح توسعه­یافتگی کشاورزی در دستور کار قرار گیرد. Manuscript profile -
Open Access Article
144 - عوامل موثر بر توسعه روستایی در استان گیلان با تاکید بر نقش واحدهای تعاونی
حسین اصدق پور زهرا امیری واژهی توسعه درمعانی خاص خود و در ترکیب با واژههای دیگر، حامل برخی اختلاف­نظرها است ، اما درمعنای عام اگر بهبود اوضاع عمومی یک جامعه تعریف گردد، مفهومی مقبول نظریه­پردازان و سیاست­مداران جوامع مختلف خواهدبود. در ایران نیز پس­از تاکید رهبر معظم ان More واژهی توسعه درمعانی خاص خود و در ترکیب با واژههای دیگر، حامل برخی اختلاف­نظرها است ، اما درمعنای عام اگر بهبود اوضاع عمومی یک جامعه تعریف گردد، مفهومی مقبول نظریه­پردازان و سیاست­مداران جوامع مختلف خواهدبود. در ایران نیز پس­از تاکید رهبر معظم انقلاب بر"طراحی مدل ایرانی­اسلامی پیشرفت"، این مفهوم عام درمیان برنامهریزان کلان کشور اهمیت ویژهای یافت. توسعه روستایی به ­عنوان را هبردی به ­منظور بهبود زندگی اجتماعی و اقتصادی روستاییان، بدون­شک در کشوری که حیات اجتماعی آن بر روستا و روستاییان استوار است به توسعه در سطح ملی کمک خواهد کرد. قانون اساسی جمهوری اسلامی ایران نیز با تعابیری توسعه و عمران روستایی را در زمره وظایف دولت برمیشمارد. در پژوهش حاضر با هدف تعیین سهم هریک از عوامل مورد توافق توسعه روستایی، در ایجاد توسعه ی پایدار روستایی استان گیلان، داده­های مربوط به 75 شاخص توسعه روستایی از آمارهای رسمی موجود استخر اجو به روش تاکسونومی عددی، ذیل شش عامل طبقه­بندی و هممعیارشده، سپس سهم هر یک بوسیله تحلیلهای آماری، به ترتیب: 1-منابع انسانی ،2-هزینه­ های زیربنایی،3- هزینه­ های فرهنگی ­اجتماعی،4- عملکرد اقتصادی،5-موقعیت و منابع طبیعی 6-مدیریت روستایی، رتبه­بندی گردید. هم­چنین تاثیر واحدهای تعاونی در توسعه روستایی و تغییر سهم عوامل آن، بسیار ناچیز ارزیابی­شد که لزوم بازنگری در ساختار اقتصادی و مدیریت روستایی استان با توجه به نظام بهره­برداری تعاونی را آشکار میسازد. Manuscript profile -
Open Access Article
145 - Effective methods to reduce the pit wall displacement (Case study: Pars complex project)
Masoumeh Mehrabi Ali Uromeihy -
Open Access Article
146 - Geotechnical-Geological studies and tunnel support design at Rudbar-Lorestan dam site, Iran
Saeed Masoud Shamsoddin Parviz Maarefvandz -
Open Access Article
147 - Numerical Modeling and Stability Analysis of Shallow Foundations Located Near Slopes (Case Study: Phase 8 Gas Flare Foundations of South Pars Gas Complex)
Mohammad Azarafza Ebrahim Asghari-Kaljahi Mohammadreza Moshrefy-far -
Open Access Article
148 - Comparison of Equivalent Continuum and Discontinuum Methods in Stability Analysis of a Natural Underground Karst
Mahnaz Laghaei Alireza Baghbanan Masoud Torkan Siavash Norouzi Meysam Lak -
Open Access Article
149 - Finite element numerical modeling of geogrid-reinforced shallow foundation’s behavior on loose soils
Morteza Alemyparvin -
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150 - Numerical finite element modeling for earth-dam grouting and curtains wall design by Plaxis software
Reza Poursalim Alireza Alizade Majdi -
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151 - Deformations Analysis and Finite Element Numerical Modeling of Soil’s Excavations Improved by Soil Nailing
Morteza Alemyparvin -
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152 - Application of micro-pile for excavated trench dynamic stabilization by using three-dimensional finite element numerical method
Leyla Hamedi Ali Sanaeirad -
Open Access Article
153 - Numerical modeling to evaluate the effect of soil liquefaction on the bearing capacity of piles
Bahram Chatrenoor Ahmad Maleki -
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154 - Contamination Effects on the Bearing Capacity of Circular Shallow Foundation Rested on Sand
Alireza Hajiani Boushehrian -
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155 - Three-dimensional Finite Elements Numerical Modeling for Strip Foundations on Granular Soils Reinforced with Micro-piles
Leyla Hamedi Ali Sanaeirad -
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156 - Numerical modeling of sealing curtain design performance in earth-dams implemented on layered soils (Case study: Abbasabad dam)
Seyed Shahb Emamzadeh Amir Taheri -
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157 - Numerical finite element modeling of creep behavior in clayey soil specimen under axial loading
Mahdi Aslalinezhad Fard -
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158 - Numerical Modeling for Behavioral Analysis of Expansive Soil under Shallow Foundations
Mehdi Kouhdaragh Morteza Alemyparvin -
Open Access Article
159 - Numerical modeling and seismic behavior analysis of strip foundation on sandy soils
Morteza Alemyparvin Mehdi Kouhdaragh -
Open Access Article
160 - Numerical Analysis for Tectonic Activity and Landslide Stability Evaluation in Baneh, Kurdistan, Iran
Semko Arefpanah Alireza Sharafi -
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161 - Failure area evaluation of the coupler with threaded bar: Experimental and Numerical study
mohamad reza shokrzadeh Fariborz Nateghi Allahe Mohammad Reza Mansoori, pasha pasha -
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162 - 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 -
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163 - Model study reservoir flushing
S.H Ghoreishi M.R Majdzadeh Tabatabai -
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164 - CFD and dimensionless parameter analysis of Froude number to determine the flow regime over ogee spillways
H.R Vosoughifar A.R Daneshkhah -
Open Access Article
165 - Investigating the effect of Inlet and Outlet location on Flow field and Sedimentation pattern of a rectangular settling basin using CCHE2D
M.R Majdzadeh Tabatabaie M.R Pirestani S Alimohamadi -
Open Access Article
166 - Influence of Slope and the Number of Steps on Energy Dissipation in Stepped Spillway Using Numerical Model
J Bazargan M safakheil -
Open Access Article
167 - CFD Application in 3D flow filed modeling of a large dam reservoir
A Khosronejad -
Open Access Article
168 - Stepped Spillway Performance: Study of the Pressure and Turbulent Kinetic Energy versus Discharge and Slope
Khosro Morovati Afshin Eghbalzadeh -
Open Access Article
169 - Numerical Simulation of Skewed Slot Effect on Local Scour Reduction
T Esmaeili A.A Dehghani M.R Pirestani Tetsuya Sumi -
Open Access Article
170 - Effective processes on the fate of oil slick after spill accidents in marine environment - important in numerical models of oil spill
Shahla Habibi Vahed ZanjaniThis paper presents the effective processes on the oil slick after spill accidents in sea. Processes include advection, evaporation, dissolution, photo-oxidation, sedimentation and biodegradation which are described by analytical methods. The processes can influenc and MoreThis paper presents the effective processes on the oil slick after spill accidents in sea. Processes include advection, evaporation, dissolution, photo-oxidation, sedimentation and biodegradation which are described by analytical methods. The processes can influenc and change the initial parameters of oil, including density, water content and viscosity. Spreading process play a governing role during a period of several hours after spill accidents, while the process of transforming oil slick may occur during a period of several days. Estimation of evaporation, advection and the thickness of the oil layer is used in calculating the ratio of the natural dispersion by numerical models. The evaporation and the thickness determine the lifetime of oil slick on the sea surface by many models. In addition, estimates of the layer area of the slick can be used to evaluate efficiency of oil spill control methods and evaluation of their environmental impacts. The study was performed in the Assalouyeh marine region on the northern coasts of Persian Gulf, for effective processes on the fate of gas condensate slick. The results show that after spill accidents, the gas condensates transfer into the atmosphere due to evaporation and atmospheric and marine conditions, and also penetrate in the water column. Due to wind velocity, gas condensates move away from the coast in the winter and in summer due to higher stability at sea, gas condensate particles can accumulate on the surface (especially for larger particles). Manuscript profile -
Open Access Article
171 - Comparison of results of 2 three-dimensional numerical models to predict the movement of oil slick from an accidental spill in the Singapore Strait
Sh. Habibi Vahed ZanjaniThis paper presents a three- dimensional numerical model for prediction of themovement of oil slicks from a spill accident in the Strait of Singapore. The results ofthis model are compared with the results of the model which was run by Chao et al.This model has previous MoreThis paper presents a three- dimensional numerical model for prediction of themovement of oil slicks from a spill accident in the Strait of Singapore. The results ofthis model are compared with the results of the model which was run by Chao et al.This model has previously been developed for prediction of movement of gascondensates from spill accidents in the Assalouyeh marine Oil and Gas region andhas achieved good results. The model is simulated based on the solution of theNavier-Stokes and the continuity equations. For the solution of advection term anupwind weighted multidimensional positive definite advection transport algorithm(MPDATA) used. This algorithm uses an explicit finite difference scheme with ananti-diffusive velocity for equilibrium diffusion. Comparison of the results of the twomodels showed good consistency that is considered for the introduced model as areliable verification. Manuscript profile -
Open Access Article
172 - Comparison of results of 2 three-dimensional numerical models to predict the movement of oil slick from an accidental spill in the Singapore Strait
J. Khoshkhoo H. Khara H. Babaei M. Pedram JarfThis paper presents a three- dimensional numerical model for prediction of themovement of oil slicks from a spill accident in the Strait of Singapore. The results ofthis model are compared with the results of the model which was run by Chao et al.This model has previous MoreThis paper presents a three- dimensional numerical model for prediction of themovement of oil slicks from a spill accident in the Strait of Singapore. The results ofthis model are compared with the results of the model which was run by Chao et al.This model has previously been developed for prediction of movement of gascondensates from spill accidents in the Assalouyeh marine Oil and Gas region andhas achieved good results. The model is simulated based on the solution of theNavier-Stokes and the continuity equations. For the solution of advection term anupwind weighted multidimensional positive definite advection transport algorithm(MPDATA) used. This algorithm uses an explicit finite difference scheme with ananti-diffusive velocity for equilibrium diffusion. Comparison of the results of the twomodels showed good consistency that is considered for the introduced model as areliable verification. Manuscript profile -
Open Access Article
173 - تحلیل کمانش پیچشی میل گاردان کامپوزیتی خودرو بر اساس تئوری مرتبه بالا با در نظر گرفتن تغییر شکل اولیه
مهدی حسینی محمد شرعیات -
Open Access Article
174 - Ranking of Provinces of the Country Based on Business Space Indicators by Numerical Taxonomy
FAZEL QORBANI Ahmad Sarlak Gholamali HajiThe purpose of this study is to rank the provinces of the country based on business space indicators based on 22 components of business space in the period 1394-1384, which was evaluated using numerical taxonomy technique. The research method is descriptive the and is a MoreThe purpose of this study is to rank the provinces of the country based on business space indicators based on 22 components of business space in the period 1394-1384, which was evaluated using numerical taxonomy technique. The research method is descriptive the and is an applied research type. In this research, in order to rank the provinces of the country based on 22 indexes of business space during 1384-1394, usined numerical taxonomic techniques, and the method of collecting library information based on raw data from the research group of the Parliamentary Research Center Islamic Council of Iran has been used. Based on the average results of a seven-year period based on the 22 business environment indicators, the provinces of Guilan, Chaharmahal Bakhtiari, Ardebil and Central have ranked first to fourth, respectively, the best estimate of the business environment. West Azerbaijan, Bushehr, Kohgiluyeh and Boyer Ahmed and Ilam have been ranked 27 to 30, respectively. Named the most disadvantaged provinces in the country. Manuscript profile -
Open Access Article
175 - Some results on higher numerical ranges and radii of quaternion matrices
Gh. Aghamollaei N. Haj Aboutalebi -
Open Access Article
176 - A numerical solution of mixed Volterra Fredholm integral equations of Urysohn type on non-rectangular regions using meshless methods
M. Nili Ahmadabadi H. Laeli Dastjerdi -
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177 - Some improvements of numerical radius inequalities via Specht’s ratio
Y. Khatib M. Hassani -
Open Access Article
178 - New lower bound for numerical radius for off-diagonal $2\times 2$ matrices
B. Moosavi M. Shah HosseiniNew norm and numerical radius inequalities for operators on Hilbert space are given. Among other inequalities, we prove that if $ A, B \in B(H) $, then \[\Vert A \Vert - \frac{3 \Vert A-B^* \Vert }{2} \leq \omega\left(\left[\begin{array}{cc} 0 & A \\ B & 0 \end{array}\r MoreNew norm and numerical radius inequalities for operators on Hilbert space are given. Among other inequalities, we prove that if $ A, B \in B(H) $, then \[\Vert A \Vert - \frac{3 \Vert A-B^* \Vert }{2} \leq \omega\left(\left[\begin{array}{cc} 0 & A \\ B & 0 \end{array}\right]\right).\] Moreover, $\omega(AB) \leq \frac{3}{2} \Vert Im(A) \Vert \Vert B \Vert + D_{B}\; \omega(A) $. In particular, if $ A $ is self-adjointable, then $\omega(AB) \leq D_{B} \Vert A \Vert$, where $D_{B}=\underset{\lambda \in \mathbb{C}}{\mathop{\inf}}\,\left\| B-\lambda I \right\|$. Manuscript profile -
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179 - Solving the liner quadratic differential equations with constant coefficients using Taylor series with step size h
M. Karimian -
Open Access Article
180 - A mathematically simple method based on denition for computing eigenvalues, generalized eigenvalues and quadratic eigenvalues of matrices
M. Nili Ahmadabadi -
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181 - A note on unique solvability of the absolute value equation
T. Lotfi H. Vieseh -
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182 - Higher rank numerical ranges of rectangular matrix polynomials
Gh. Aghamollaei M. Zahraei -
Open Access Article
183 - Approximate solution of system of nonlinear Volterra integro-differential equations by using Bernstein collocation method
Sara Davaeifar Jalil Rashidinia -
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184 - Analytical Solution of Steady State Substrate Concentration of an Immobilized Enzyme Kinetics by Laplace Transform Homotopy Perturbation Method
Devipriya Ganeshan -
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185 - Optimal Control of Hand, Foot and Mouth Disease Model using Variational Iteration Method
Devipriya Ganeshan L. Jane Darne -
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186 - A Model of Coronavirus Pandemic Spread with Lockdown and Quarantine
Dejen Mamo -
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187 - 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 -
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188 - Mathematical Model for the Effects of Intervention Measures on the Transmission Dynamics of Tungiasis
JAIROS SHINZEH Livingstone Luboobi -
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189 - Advanced Refinements of Numerical Radius Inequalities
Farzaneh Pouladi Najafabadi Hamid Moradi -
Open Access Article
190 - Analytical Solution of the Effect of Awareness Program by Media on the Spread of an Infectious Disease by Homotopy Perturbation Method
Devipriya Ganeshan -
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191 - Casimir Energy in Non-relativistic Backgrounds: Numerical Approach
Mozhgan Belyad Mohammad Reza Tanhayi Tanhayi -
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192 - Norm and Numerical Radius Inequalities for Hilbert Space Operators
Mohsen Omidvar Mahdi Ghasvareh -
Open Access Article
193 - An explicit method for numerical solution of the equation governing the motion of a particle under arbitrary force fields
Ghiyam Eslami Masoumeh Zeinali -
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194 - A SIXTH ORDER METHOD FOR SOLVING NONLINEAR EQUATIONS
Farshid Mirzaee Afsun Hamzeh -
Open Access Article
195 - ADOMIAN DECOMPOSITION METHOD AND PADÉ APPROXIMATION TO DETERMINE FIN EFFICIENCY OF CONVECTIVE SOLAR AIR COLLECTOR IN STRAIGHT FINS
Tabet Ismail M. Kezzar K. Touafe N. Bellel S. Gherieb A. Khelifa M. Adouane -
Open Access Article
196 - Ranking 8 Metropolises Of Iran in Terms Of Level Of Development With AHP and Taxonomy(1390)
A. Monsef M. Sameti M. Mousavi MadaniEconomic growth and development has been important to economists. Every economist has mentioned different elements in order for economic growth in every country. One of these elements is paying attention to regional development and the necessity of appropriate distribut MoreEconomic growth and development has been important to economists. Every economist has mentioned different elements in order for economic growth in every country. One of these elements is paying attention to regional development and the necessity of appropriate distribution of resources in order to equally develop all regions of a country. These indexes have been categorized into five categories as the following: Economic, cultural and educational, construction and housing, hygiene and treatment, and urban facilities indexes; this study has been done in 1390. To do this study, two methods of numerical taxonomy and the process of hierarchy analysis have been applied to help.The results obtained from the method of taxonomy show that metropolitan cities, Tehran, Isfahan, Tabriz, Karaj, Mashhad, Qom, Shiraz, and Ahvaz are the most developed cities in Iran respectively. The results obtained from the process of hierarchy analysis show that metropolitan cities, Tehran, Isfahan, Karaj, Mashhad, Tabriz, Shiraz, Qom, and Ahvaz are the most developed cities in Iran respectively. Manuscript profile -
Open Access Article
197 - Ranking Eight Metropolitan Cities of Iran in Terms Level of Development AHP and 2011 classifiction
A. Monsef M. Sameti M. Mousavi MadaniEconomic growth and development has been important to economists. Every economist has mentioned different elements for economic growth. One of these elements is paying attention to regional development and the necessity of appropriate distribution of resources in order MoreEconomic growth and development has been important to economists. Every economist has mentioned different elements for economic growth. One of these elements is paying attention to regional development and the necessity of appropriate distribution of resources in order to equally develop all regions of a country. These indexes have been categorized into five categories as the following: Economic, cultural and educational, construction and housing, hygiene and treatment, and urban facilities indexes; This study has been done in 2011. To do this study, two methods of numerical taxonomy and the process of hierarchy analysis have been applied. The results obtained from the method of taxonomy show that metropolitan cities, Tehran, Isfahan, Tabriz, Karaj, Mashhad, Qom, Shiraz, and Ahvaz are the most developed cities in Iran, respectively. The results obtained from the process of hierarchy analysis show that metropolitan cities, Tehran, Isfahan, Karaj, Mashhad, Tabriz, Shiraz, Qom, and Ahvaz are the most developed cities in Iran, respectively Manuscript profile -
Open Access Article
198 - Development gap in Provinces of Iran
Jamal Fatholahi Vahid Kafili Ali Reza TagizadeganThe need for sustainable development is to have regional justice in development. The imbalance in the regional justice will be an obstacle to sustainable development in long term. Understanding the development of regions is the first step to eliminate the regional dispa MoreThe need for sustainable development is to have regional justice in development. The imbalance in the regional justice will be an obstacle to sustainable development in long term. Understanding the development of regions is the first step to eliminate the regional disparities. In the present study two periods 1390 and 1375 has been chosen to assess the level of developments of provinces. According to the research literature and access to data and information, various educational and cultural, housing and infrastructural, demographic and sanitary indicators has been selected, due to the each indicator, the necessary adjustments has been made. To determine the degree of the developments of Iran’s provinces, two methods of taxonomy and TOPSIS has been used. The obtained results show that despite the reduction in the standard deviation and range of the provincial development index, there are some regional disparities in Iran yet and center-periphery test pattern is confirmed for both periods. Due to the Potential differences in different regions, applying the same program for all areas is not possible. Accordingly it is recommended that in the context of national development plans, regional plans with a focus on regional capacities must be done So that sustainable development be achieved for all areas. Manuscript profile -
Open Access Article
199 - The Story of momayyez (slash) in Grammar and Literary and Rhetoric ones from the Past up to now
Mohammad Reza SharifiMomayyez is one of the constituent elements syntax structure and grammatical and literary arrays which has created communicative and semantic function in language and superficially had added to the beauty and rhetoric of the language. In other words, in the beginning of MoreMomayyez is one of the constituent elements syntax structure and grammatical and literary arrays which has created communicative and semantic function in language and superficially had added to the beauty and rhetoric of the language. In other words, in the beginning of Persian poetry it was limited to syntax and grammar and the relation of number and that to be counted in Khorasani style, but gradually and specifically in Araghi style, with themes of literary arrays of illusion and congruency and mystical speculations together with imagination ; and in Indian style it has become complex and abstract. Furthermore, the article in Farsi language because of its diversity has complex structure and momayyes ( slash ) is one of the elements in the category of a morpheme which accompanies the noun and is counted. The numerical momayyez are used with countable nouns but the subject has not been studied as it should and has been remained unknown. Some grammarians have called it numerical dependent, illuminator, complex counting character and common relations of the number. We have tried, in this paper, to study the momayyez from grammatical and rhetorical point of view from the past up to now. Manuscript profile -
Open Access Article
200 - 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
201 - بررسی اثر قطر نانوذرات بر جابجایی آزاد نانوسیال آب- اکسید آلومینیوم با استفاده از مدلهای تکفازی و دوفازی
میثم اسفندیاری بابک مهماندوست آرش کریمی پوردر این پژوهش، اثر قطرنانوذرات در جابجایی آزاد نانوسیال آب- اکسید آلومینیوم در یک محفظه با مدل دو فازی و تکفازی بررسی شده است. محدوده عدد رایلی 105 تا 107 در کسر حجمیهای 01/0 تا 03/0 برای نانوذرات با قطر-های گوناگون (25، 33، 50 و 100) نانومتر در نظر گرفته شده است. با ت Moreدر این پژوهش، اثر قطرنانوذرات در جابجایی آزاد نانوسیال آب- اکسید آلومینیوم در یک محفظه با مدل دو فازی و تکفازی بررسی شده است. محدوده عدد رایلی 105 تا 107 در کسر حجمیهای 01/0 تا 03/0 برای نانوذرات با قطر-های گوناگون (25، 33، 50 و 100) نانومتر در نظر گرفته شده است. با توجه به طبیعت دوفازی بودن نانوسیالها، نیاز به مدلسازی با استفاده از این در حال افزایش است. فرض تکفازی (بر خلاف دو فازی) برای نانوسیالها بر این اساس است که رفتارهای هر دو فازجامد (نانوذرات) و فاز مایع (سیال پایه) کاملاً مشابه هستند. در این مطالعه، از دیدگاه اویلری- اویلری و مدل مخلوط با توجه به اثرات حرکت براونی و ترموفرسیس استفاده شده است. حرکت براونی و ترموفرسیس به ترتیب تحت اثرات گرادیان کسر حجمی و گرادیان دما بوجود میآیند که سبب بوجود آمدن لغزش میان نانوذرات و سیال پایه میشوند؛ بنابراین، نوعی ناهمگنی در رفتار میان نانوذرات و سیال پایه بوجود میآید. این ناهمگنی منجر به اثرات قابل توجهی در نتایج مدلسازی دوفازی میشود که تطابق بهتری نسبت به مدلسازی تکفازی با نتایج تجربی ایجاد میکند. نتایج نشان میدهند که با افزایش قطر و مقدار کسر حجمی نانوذرات انتقال حرات کاهش مییابد. همچنین، اثر قطر نانوذرات بر جریان و انتقال حرارت محسوس است. Manuscript profile -
Open Access Article
202 - 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
203 - CFD simulation of hydrothermal of a nanofluid in a microchannel subjected to a magnetic field
Mohammad Reza Assari Arman Mohammadian Alireza Jafar Gholibeik -
Open Access Article
204 - 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 -
Open Access Article
205 - تحلیل عملکرد یاتاقانهای کفگرد هیدرو دینامیکی با روش درونیابی مشتق
مهدی زارع مهرجردی اصغر دشتی رحمت آبادی محمدرضا فاضلروش درونیابی مشتق تعمیم یافته[1]، یک روش حل عددی مرتبه بالاست. در این روش، برخلاف سایر روشهای عددی از مقادیر تابع آزمایشی مورد استفاده بر روی تمامی نقاط دامنه مسئله برای حدس مقادیر مشتق تابع مجهول اصلی استفاده میشود. از مزایای این روش میتوان به همگرایی سریعتر نس Moreروش درونیابی مشتق تعمیم یافته[1]، یک روش حل عددی مرتبه بالاست. در این روش، برخلاف سایر روشهای عددی از مقادیر تابع آزمایشی مورد استفاده بر روی تمامی نقاط دامنه مسئله برای حدس مقادیر مشتق تابع مجهول اصلی استفاده میشود. از مزایای این روش میتوان به همگرایی سریعتر نسبت به سایر روشهای عددی موجود، نظیر روش اجزاء محدود[2] و تفاضل محدود[3] برای رسیدن به نتایج با دقت یکسان و نیز توانایی بالای این روش در حل معادلات دیفرانسیل غیرخطی حاکم بر مسائل مختلف، اشاره نمود. در این مقاله از روش درونیابی مشتق تعمیم یافته برای تحلیل عملکرد گروهی از یاتاقانهای کفگرد هیدرو دینامیکی تحت عنوان یاتاقانهای کشویی با کفشک شیب ثابت استفاده شده است. در نهایت نتایج حاصل از این بررسی برای یاتاقانهای کف گرد مورد نظر در حالتهای یک بعدی و دوبعدی با نتایج حل دقیق و نتایج حاصل از سایر روشهای عددی مقایسه شده است. مقایسه در حالات مختلف، نشان دهنده برقراری تطابق خوبی بین نتایج حاصل از روش درونیابی مشتق تعمیم یافته و سایر روشهای حل عددی میباشد. [1]- Generalized Differential Quadrature (GDQ) Method [2]- Finite Element Method) FEM) [3]- Finite Difference Method (FDM) Manuscript profile -
Open Access Article
206 - محاسبه میزان مقاومت غلطشی تایر با استفاده از نتایج تحلیل برهم کنش استاتیکی آن با جاده
حسین گلبخشی مسلم نامجوطبق بررسی های صورت گرفته از میان پدیده های مختلفی چون اصطکاک، مقاومت آیرودینامیکی هوا و سایر افت های مکانیکی، مقاومت غلطشی ناشی از خاصیت ویسکو الاستیسیته لاستیک، عامل مهمی است که 33-10 %کل اتلاف انرژی در وسایل نقلیه را به خود اختصاص می دهد. بدین جهت تحلیل و شناخت اثرات Moreطبق بررسی های صورت گرفته از میان پدیده های مختلفی چون اصطکاک، مقاومت آیرودینامیکی هوا و سایر افت های مکانیکی، مقاومت غلطشی ناشی از خاصیت ویسکو الاستیسیته لاستیک، عامل مهمی است که 33-10 %کل اتلاف انرژی در وسایل نقلیه را به خود اختصاص می دهد. بدین جهت تحلیل و شناخت اثرات مربوط به این افت نقش بسزایی در کاهش مقاومت در برابر حرکت وسیله نقلیه و در نتیجه کاهش مصرف انرژی دارد. بیشتر مراجع و مقالات منتشر شده در این زمینه مقاومت غلطشی را کسری از انرژی کرنشی ذخیره شده در تایر می دانند که به علت پدیده هیستریتیس در هر دور گردش تایر به هدر می رود. در تحلیل حاضر، با استفاده از نتایج تحلیل سه بعدی برهم کنش استاتیکی تایر و سطح صلب جاده، نخست نحوه تغییرات زمانی تنش-کرنش در مقاطع مختلف تایر مشخص گردیده است و سپس با استفاده از یک برنامه کامپیوتری در محیط نرم افزار متلب مقادیر تنشها و کرنشهای اصلی حاصل از شش مولفه تانسورهای تنش و کرنش جهت محاسبه افت هیستریتیک و در نتیجه مقاومت غلطشی تایر به کار می روند. نتایج حاصل از تحلیل حاضر در مقایسه با مطالعات عددی و تجربی صورت گرفته در این زمینه دقت قابل توجهی نشان می دهند. Manuscript profile -
Open Access Article
207 - Construction and validation of Persian computer version of Numerical Stroop test in students
faezeh adibniaThe aim of this study was to construct and validate the Persian version of the numerical stroop test in students. The research method is descriptive-survey of construction and validation type. The study population was the second grade elementary students of Arak (fourth MoreThe aim of this study was to construct and validate the Persian version of the numerical stroop test in students. The research method is descriptive-survey of construction and validation type. The study population was the second grade elementary students of Arak (fourth, fifth and sixth grades), 315 students were selected by multi-stage cluster sampling. The numerical stroop computer test was developed in Delphi. The tools of color-word stroop test, Raven’s IQ test and Connors Teacher Rating scale were used. The content validity of the test made by experts was confirmed. The convergent validity of the constructed test was also assessed using the color-word Stroop test. The convergence of the color-word stroop test with the numerical stroop section was 0.78 and with the physical stroop section was 0.71. The reliability of the designed student retest with a time interval of 21 days was also 0.88. Considering the research findings, it can be concluded that numerical strop test is a suitable cognitive tool and it can be used in future research to examine selective attention in various educational disorders such as learning disorders and other mental disorders. Manuscript profile -
Open Access Article
208 - Heat transfer Simulation of solar wall phase chang materials (PCM) for energy storage and optimization
Ali Akbar Hosseinjaniphase change materials have a high capacity in thermal energy storage, these materials can be used to prevent the heat transfer into the building besides optimize and improve the performance of the refrigeration and air conditioning system. Adding phase change materials Morephase change materials have a high capacity in thermal energy storage, these materials can be used to prevent the heat transfer into the building besides optimize and improve the performance of the refrigeration and air conditioning system. Adding phase change materials (PCM) to the building can improve the inside comfort temperature and save consumption energy of the building. In this article the parameters that affect the performance of PCM in the building walls, such as phase change temperature, latent heat, thickness, thermal conductivity, etc., have been investigated using ANSYS software. the numerical simulation of thermal energy storage in the solar walls of the building have investigated using phase change materials in different thicknesses with different heat flux rates. This wall is designed to capture the sun energy during the day, reducing energy consumption and optimizing it during peak times. Manuscript profile