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Open Access Article
1 - The spatial damping of electrostatic wave in Hall thruster beam plasma
Saty Bharti Sukhmander Singh -
Open Access Article
2 - Bohm sheath criterion for electronegative warm plasma carrying seconadary electron emission in an oblique magnetic field
Yetendra Jha Mayank Kumar Hitendra K. Malik -
Open Access Article
3 - Compressive solitons in a moving e-p plasma under the effect of dust grains and an external magnetic field
Rakhee Malik Hitendra K Malik -
Open Access Article
4 - Ultrasonic studies of ternary liquid mixtures of N-N-dimethylformamide, nitrobenzene, and cyclohexane at different frequencies at 318 K
Manoj Kumar Praharaj Abhiram Satapathy Prativarani Mishra Sarmistha Mishra -
Open Access Article
5 - Dynamical and transport properties in plasmas including three-particle spatial correlations
Hakima Ababsa Med Tayeb Meftah Thouria Chohra -
Open Access Article
6 - Study of electromagnetic solitons excited by different profile pulses
Aparna Sharma Hitendra K. Malik Harish Kumar -
Open Access Article
7 - Hydraulic analysis of sprinkler irrigation network using WaterGEMS software
Younes Shokrian-Fard Shahram Shahmohammadi KalalaghIn this research, sprinkler irrigation network of Sysan area located in Bostanabad city in Azarbayjan Province was analyzed using WaterGEMS software. This irrigation network based on the position of the main, sub-main and lateral pipes divided into three A, B, and C zon MoreIn this research, sprinkler irrigation network of Sysan area located in Bostanabad city in Azarbayjan Province was analyzed using WaterGEMS software. This irrigation network based on the position of the main, sub-main and lateral pipes divided into three A, B, and C zones and with regard to irrigation interval, the number of sets and sprinklers, 9 scenarios were defined. Hydraulic parameters (pressure and velocity) were analyzed in the nodes and the pipes before and after optimization with WaterGEMS, respectively. The hydraulic analysis indicated; based on the required pressure of the sprinkler operation (40 m-H2O) and the maximum supply pressure of the selective pump (70 m-H2O), there was no problem or limitation in supplying the network pressure. In the other words, the pressure aligned with standards. While according to permissible velocity in the sprinkler irrigation pipes, the critical velocities were observed in 4 scenarios in zone B and in 5 scenarios in zone C. By applying the necessary changes in the diameter of the pipes and provided that the pressure variations aligns with standards (less than 20%), the velocities were optimized and aligned with standards. Given that the hydraulic parameters were optimized by decreasing pipe diameter, the optimally designed system with WaterGEMS software led to a decrease of 7.3% in costs compared to the designed and implemented system. Manuscript profile -
Open Access Article
8 - Influence of Temperature and Air Velocity Changes on Drying Process of Peanut in Hot Air Dryer
M. Gholami Parshokohi E. Merzanezhad A. H. Ahmad Beigi M. Salimi BaniIntroduction: Decrease of moisture content to safe level in order to reach maximum maintenance is the principle goal of drying agricultural products. Parameters of temperature and air velocity are considered the main important factors in drying process. Mathematical mod MoreIntroduction: Decrease of moisture content to safe level in order to reach maximum maintenance is the principle goal of drying agricultural products. Parameters of temperature and air velocity are considered the main important factors in drying process. Mathematical modeling of drying process is used to design and improve available drying system and also to control the process. Materials and Methods: In this research, the effect of temperature (40, 50, 60 and 70 ºC) and air velocity (2 and 3 m.s-1) changes on drying time and rate of drying peanut using hot air dryer has been studied. Moisture variations during drying process under different conditions were fitted using various mathematical models including Newton, Two-term, Midili, Page, Modified Page and Logarithmic. Results: Factors of temperature and air velocity had significant effects on the drying time and the rate of drying (P<0.01). Conclusion: Effect of temperature on the drying process was considerable, therefore an increase in this parameter led to a 67.8% decrease in time and a 109% increase in drying rate. The maximum influence of air velocity on drying time and rate was 37.3 and 20.9%, respectively. Moisture variations during the drying process were well fitted to a two-term model(R=0.999). Manuscript profile -
Open Access Article
9 - Comparison of the Performance of Internal and External Loop Air-lift Reactors for Water Treatment by Activated Sludge
Mohammad Ali Salehi Nasrin HakimghiasiBackground and Objective: In This study the impacts of operating conditions such as aeration rate, the downcomer-to-riser cross-sectional area ratio (Ad/Ar), and liquid phase properties on the hydrodynamics and volumetric mass transfer coefficient in three-phase airlift MoreBackground and Objective: In This study the impacts of operating conditions such as aeration rate, the downcomer-to-riser cross-sectional area ratio (Ad/Ar), and liquid phase properties on the hydrodynamics and volumetric mass transfer coefficient in three-phase airlift reactors was investigated. Method: Experiments were conducted in external loop air-lift reactor with downcomer to riser cross-sectional area ratio (AD/AR=0.14) and internal air-lift reactors with downcomer to riser cross-sectional area ratios 0.36 and 1. Air and Water were used as gas and liquid phases, respectively and activated sludge is used as the solid phase. Findings: The liquid circulation velocity, gas holdup and mass transfer coefficient increased with an increase in the superficial gas velocity, decrease the sludge concentration and decrease downcomer to riser cross-sectional area ratio. The maximum amount of gas hold up, 0.178 in external air-lift reactor with 1%(w/w) activated sludge in superficial gas velocity 0.24(m/s) was observed. A model to predict the effect of activated sludge concentration, the superficial gas velocity and the downcomer-to-riser cross-sectional area ratio on the mass transfer activated sludge airlift reactors provided which with the experimental results are in good agreement. Discussion and Conclusion: The evaluation of internal and external reactors performance at different concentration and superficial gas velocity show that the air-lift reactor with external loop has better performance in comparison with internal airlift reactors. Manuscript profile -
Open Access Article
10 - Optimization of rectangular secondary sedimentation tanks inlet (Case study: Tehran Wastewater Treatment Plant)
Akbar Akbarpour Alireza MardookhpourBackground and Objective: One of the most important parts of treatment plants is the sedimentation tanks in them, which play an important role in wastewater treatment. Due to this issue, a correct understanding of the behavior of sediment reservoirs is essential for the MoreBackground and Objective: One of the most important parts of treatment plants is the sedimentation tanks in them, which play an important role in wastewater treatment. Due to this issue, a correct understanding of the behavior of sediment reservoirs is essential for the design and operation of reservoirs. Therefore, it is not far-fetched that engineers are thinking of designing new tanks as best as possible and improving their efficiency. In order to achieve these goals, various methods have been proposed, among which improving the efficiency of reservoirs by changing the geometry in the reservoir is not only important but also an economic method and attracts the opinion of engineers from different aspects. Has attracted.Material and Methodology: The studied model has been removed from the existing wastewater treatment plant in Tehran. In the basic paper, different inputs of flow to the sedimentation pond are analyzed and by comparing the efficiency of different inputs, a specific input is presented as a suggestion. In the present study, the same inlet and reservoir will be used and by adding the sediment parameter as a new parameter, the hydraulic and flow and sedimentation characteristics in the said reservoir will be determined. It is 13 meters wide and 4/4 high. In order to observe the distribution of suspended solids during the settling process, the water in the reservoir at the beginning of the process is free of sediment (clear) and then with the entry of wastewater containing suspended solids, the method of releasing suspended solids and then settling of solids can be Observed in full.Findings: In the model at the entry points, distances of 10, 20 and ... to 60 (output overflow) by creating virtual sensors, flow parameters were used to produce and analyze comparative graphs. The findings indicate that time The analysis is in accordance with the residence time of the regulation is 6500 seconds, which in the range of about 800 to 1000 seconds of analysis (16 minutes) the flow and movement conditions of sediments are balanced and is constant until the end of the residence timeDiscussion and Conclusion: The results show that the contour particles of sediment particles in the reservoir are at times 50, 300, 500 and 1000, respectively. After 1000 seconds to 6500 seconds, the situation is completely stabilized and there is no change in the contours compared to 1000 seconds. On the other hand, the amount of suspended solids in wastewater decreases by moving downstream and reaches zero within 10 meters of the end, which indicates the complete removal of suspended solids in the sedimentation process. The results also show that the most turbulent energy is at the outlet at a distance of 10 meters from the inlet, which is due to the eddy current and rotation in this area. By moving downstream, the turbulence current decreases and at a point 10 meters from the outlet is close to zero, which indicates the correct operation of the tank. Manuscript profile -
Open Access Article
11 - Magnetic fluid lubrication of porous pivoted slider bearing with slip and squeeze velocity
Rajesh C. Shah Dilip B. Patel -
Open Access Article
12 - Investigation on Hot Tearing Susceptibility of A201 Aluminum Alloy in Different Ingate Velocities and Molds
M. H Ayandeh A. A Kashi M. Ghambarian H. Karimi A. Mootabha A. Khoyini E.M. Boushehri -
Open Access Article
13 - Investigation on the Simultaneous Effects of Zn Additions and Critical Ingate Velocity on the Hot Tearing Susceptibility of A356 and A206 Aluminum Alloys
M. Ghambarian S.M.A. Boutorabi F. Shahri -
Open Access Article
14 - Effect of Injection Velocity on Heat Transfer of Water/Alumina Nano Fluid in A Rectangular Microchannel
Afshin Ahmadi Nadooshan Afshin Shiriny Morteza Bayareh -
Open Access Article
15 - Fuzzy-GSA Based Control Approach for Developing Adaptive Cruise Control
M. Bostanian -
Open Access Article
16 - High-Velocity Compaction of Aluminum Powder by Gas Detonation Forming Technique
Tohid Mirzababaie Mostofi Mostafa Sayah Badkhor Hashem Babaei -
Open Access Article
17 - Effect of using a Dynamic Absorber On Vibrations of an Opposed-Piston Ultralight Aircraft Engine
Mohammad Reza Najafi Saied Mahjoub Moghadas Mojtaba Moradi -
Open Access Article
18 - Non-Destructive Assessment of Concrete Quality Produced with Riverbed Sand and Drainage Sand as Fine Aggregates
Aderemi__A__Alabi Alabi Ayobami__Eniola__Agboola Agboola Joseph__Olawale__Akinyele Akinyele Victor MakindeIn this work, the effect of fine aggregates from two different sources on the quality and strength of concrete was determined using UPV measurements. The concrete samples were produced using a nominal mix ratio of 1: 1½: 3 and water-cement ratio of 0.55, with three diff MoreIn this work, the effect of fine aggregates from two different sources on the quality and strength of concrete was determined using UPV measurements. The concrete samples were produced using a nominal mix ratio of 1: 1½: 3 and water-cement ratio of 0.55, with three different aggregate sizes (3/8, ½ and ¾ inches) of granite mixed separately with sand obtained from Ogun river and a local drainage in Abeokuta, Southwestern, Nigeria. UPV was measured through each sample on days 1, 7, 14, 21 and 28 after curing using Pundit lab+ equipment. Comparison of the actual compressive strength and estimated compressive strengths from equations generated for each sample type using the crushed samples on the 7th and 28th days respectively shows that most estimations were within the acceptable ±20% variation. Results show that there is no significant difference between the samples made from using either of the two fine aggregates. Manuscript profile -
Open Access Article
19 - An Analytic Study on the Dispersion of Love Wave Propagation in Double Layers Lying Over Inhomogeneous Half-Space
A Mandi S Kundu P Chandra Pal P Pati -
Open Access Article
20 - Study of Love Waves in a Clamped Viscoelastic Medium with Irregular Boundaries
P Alam M.K Singh -
Open Access Article
21 - Rigidity and Irregularity Effect on Surface Wave Propagation in a Fluid Saturated Porous Layer
R.K Poonia D.K Madan V Kaliraman -
Open Access Article
22 - The Effects of Initial In-Plane Loads on the Response of Composite-Sandwich Plates Subjected to Low Velocity Impact: Using a New Systematic Iterative Analytical Process
K Malekzadeh Fard A Azarnia -
Open Access Article
23 - Axially Symmetric Vibrations of a Liquid-Filled Poroelastic Thin Cylinder Saturated with Two Immiscible Liquids Surrounded by a Liquid
B Sandhyarani J Anand Rao P Malla Reddy -
Open Access Article
24 - Effect of Micropolarity on the Propagation of Shear Waves in a Piezoelectric Layered Structure
R Kumar K Singh D.S Pathania -
Open Access Article
25 - Study of Torsional Vibrations of Composite Poroelastic Spherical Shell-Biot’s Extension Theory
R Gurijala M Reddy Perati -
Open Access Article
26 - Assessment of Different Mathematical Models for Analysis of Low-Velocity Impact on Composite Plates in Presence of Pre-loads
A Davar A Labbafian Mashhadi J Eskandari Jam M Heydari Beni -
Open Access Article
27 - Experimental and Numerical Investigations of the Effect of Impact Angle and Impactor Geometry on the High-Velocity Impact Response of Aluminum Honeycomb Structures
H Alikhani S Derakhshan H Khoramishad -
Open Access Article
28 - Vibration and Stability Analysis of Composite Tube Conveying Fluid Flow Equipped with Piezoelectric Ring
M Nazarzadeh Ansarodi H Biglari M.R Saviz -
Open Access Article
29 - Analytical and Numerical Investigation of Energy Absorption in Graded Aluminum Open Cell Foam under Low Velocity Impact Loading
S Davari S. A Galehdari A AtrianGiven the significance of energy absorption in various industries, light shock absorbers such as structures made of metal foam have been considered. In this study, analytical equation of plateau stress is presented for an open cell foam based on the Gibson-Ashby model, MoreGiven the significance of energy absorption in various industries, light shock absorbers such as structures made of metal foam have been considered. In this study, analytical equation of plateau stress is presented for an open cell foam based on the Gibson-Ashby model, which follows elastic perfectly plastic behavior. For comparison of acquired analytical equations, the problem for a cell and then for three cells that make up an aluminum open cell foam is simulated in ABAQUS/CAE. Using the stress strain diagram, plateau stress and densification strain equations, the specific energy absorbed of the open cell metal foam is extracted. The capacity of absorb energy for an aluminum open cell foam with three cell is obtained once using analytical equations and again by using numerical simulation in ABAQUS/CAE. Numerical results retain an acceptable accordance with analytical equations with less than 3% occurred error for absorbed energy. To ensure the accuracy of numerical simulation, the results of simulating are compared with the results of the simulation of the same foam in a reference whose accuracy is verified by the experiment. Based on the results, the effective cross-sectional area of the foam with Gibson-Ashby cell does not follow the cross-sectional that is used for the calculation of plateau stress in adsorbent structures. Then tow equations are extracted to calculate the effective cross-sectional area and the transfer force. Applying sequential quadratic programming method (SQP) and genetic algorithm (GA), to design a graded metal foam with high specific Energy absorption. Manuscript profile -
Open Access Article
30 - Effect of Rotation and Stiffness on Surface Wave Propagation in a Elastic Layer Lying Over a Generalized Thermodiffusive Elastic Half-Space with Imperfect Boundary
R Kumar V Chawla -
Open Access Article
31 - Effect of Initial Stress on Propagation of Love Waves in an Anisotropic Porous Layer
S Gupta A Chattopadhyay D.K Majhi -
Open Access Article
32 - Analysis of Plane Waves in Anisotropic Magneto-Piezothermoelastic Diffusive Body with Fractional Order Derivative
R Kumar P Sharma -
Open Access Article
33 - Wave Propagation in a Layer of Binary Mixture of Elastic Solids
R Kumar M Panchal -
Open Access Article
34 - Nonlinear Finite Element Eccentric Low-Velocity Impact Analysis of Rectangular Laminated Composite Plates Subjected to In-phase/Anti-phase Biaxial Preloads
M Shariyat M Moradi S Samaee -
Open Access Article
35 - Torsional Surface Wave Propagation in Anisotropic Layer Sandwiched Between Heterogeneous Half-Space
P.K Vaishnav S Kundu S.M Abo-Dahab A Saha -
Open Access Article
36 - Dynamic Fracture Analysis Using an Uncoupled Arbitrary Lagrangian Eulerian Finite Element Formulation
A.R Shahani M.R Amini -
Open Access Article
37 - Free Vibration Analysis of Micropolar Thermoelastic Cylindrical Curved Plate in Circumferential Direction
G Partap R Kumar -
Open Access Article
38 - Analytical Prediction of Indentation and Low-Velocity Impact Responses of Fully Backed Composite Sandwich Plates
M Hosseini S.M.R Khalili -
Open Access Article
39 - Variational Principle and Plane Wave Propagation in Thermoelastic Medium with Double Porosity Under Lord-Shulman Theory
R Kumar R Vohra M.G Gorla -
Open Access Article
40 - Analysis of Axisymmetric Extrusion Process through Dies of any Shape with General Shear Boundaries
H Haghighat G.R Asgari -
Open Access Article
41 - Response of Two Temperatures on Wave Propagation in Micropolar Thermoelastic Materials with One Relaxation Time Bordered with Layers or Half Spaces of Inviscid Liquid
R Kumar M Kaur S.C Rajvanshi -
Open Access Article
42 - Dispersion of Love Wave in a Fiber-Reinforced Medium Lying Over a Heterogeneous Half-Space with Rectangular Irregularity
R.M Prasad S Kundu -
Open Access Article
43 - Problem of Rayleigh Wave Propagation in Thermoelastic Diffusion
R Kumar V Gupta -
Open Access Article
44 - Vibration Analysis of Carotid Arteries Conveying Non-Newtonian Blood Flow Surrounding by Tissues
A.H Ghorbanpour Arani A Rastgoo A. Ghorbanpour Arani R Kolahchi -
Open Access Article
45 - Influences of Heterogeneities and Initial Stresses on the Propagation of Love-Type Waves in a Transversely Isotropic Layer Over an Inhomogeneous Half-Space
P Alam S Kundu -
Open Access Article
46 - Prediction model of limestone rock mass quality, using seismic wave velocity (Case study: Sarvak formation in Bakhtiari dam site)
Mehdi Kianpour Seyed Mahmoud Fatemi Aghda مهدی تلخابلو -
Open Access Article
47 - ارزیابی نرم افزار ANSYS CFX در شبیهسازی توزیع سرعت و فشار بر روی سرریز تاج دایرهای
محمدجواد امیری منوچهر حیدرپور مهدی بهرامی رخساره رستمیاننرم افزار ANSYS CFX، نرم افزاری کارآمد و چند منظوره برای شبیه سازی دینامیک سیالات محاسباتی (CFD) در تمام سطوح و پیچیدگی می باشد. این نرم افزار از روش حجم محدود برای حل عددی جریان های دو و سه بعدی، جریان های تراکم پذیر و تراکم ناپذیر، جریان های لزج و غیرلزج، آرام و Moreنرم افزار ANSYS CFX، نرم افزاری کارآمد و چند منظوره برای شبیه سازی دینامیک سیالات محاسباتی (CFD) در تمام سطوح و پیچیدگی می باشد. این نرم افزار از روش حجم محدود برای حل عددی جریان های دو و سه بعدی، جریان های تراکم پذیر و تراکم ناپذیر، جریان های لزج و غیرلزج، آرام و آشفته با مدل های توربولانس مختلف، سیالات نیوتنی و غیرنیوتنی، محیط های متخلخل، جریان های دائمی و غیر دائمی، و مسائل تقابل سیال و جامد (FSI) استفاده می کند. سازه های کنترل و اندازهگیری جریان از اجزای مهم و ضروری در شبکه های آبیاری و زهکشی می باشند. در بین این سازه ها، سرریزها به علت داشتن روابط ساده و نسبتاً دقیق ازکاربرد بیشتری برخوردارند. به منظور ارزیابی نرم افزار ANSYS-CFX در شبیه سازی جریان بر روی سرریز تاج دایره ای، دو سرریز مجزا یکی با شیب پایین دست و بالادست به ترتیب 45 درجه و قایم و دیگری با شیب پایین دست و بالادست به ترتیب 45 درجه و 60 درجه در نظر گرفته شد. شبیه سازی جریان برای 3 دبی مختلف جریان و باطبع سه مقدار مختلف انجام گردید. نتایج نشان داد که پیشبینی نرم افزار تطابق بسیار خوبی با مقادیر اندازهگیری دارد. شیب بالادست و پایین دست سرریز در خروجی مدل تأثیر چندانی نداشته و مدل به خوبی پروفیل های فشار و سرعت را برای هر دو شیب شبیه سازی کرده است. به طور کلی نتایج مدل در شیب 90-45 نسبت به 60-45 بهتر می باشد. Manuscript profile -
Open Access Article
48 - مطالعه عددی بررسی تأثیر فاصله و زاویه آبشکنها بر توزیع سرعت متوسط و موقعیت حداکثر سرعت در قوس 90 درجه ملایم
یاسر اهلی مرتضی بختیاری مسیح مراستفاده از آبشکن به عنوان یکی از ساده ترین راهکارهای حفاظت از سواحل همواره مورد توجه مهندسین رودخانه بوده است. در تحقیق حاضر هدف، بررسی عددی تأثیر پارامترهای فاصله و زاویه قرارگیری آبشکن ها بر الگوی توزیع سرعت متوسط و موقعیت سرعت حداکثر در شرایط قوس 90 درجه ملایم Moreاستفاده از آبشکن به عنوان یکی از ساده ترین راهکارهای حفاظت از سواحل همواره مورد توجه مهندسین رودخانه بوده است. در تحقیق حاضر هدف، بررسی عددی تأثیر پارامترهای فاصله و زاویه قرارگیری آبشکن ها بر الگوی توزیع سرعت متوسط و موقعیت سرعت حداکثر در شرایط قوس 90 درجه ملایم بوده است بدین منظور از نرم افزار ANSYS CFXبرای شبیه سازی عددی رفتار جریان و جهت کالیبراسیون مدل یاد شده از نتایج داده های آزمایشگاهی برداشت شده سه بعدی سرعت در تحقیق بختیاری و همکاران (2013) استفاده شده است. متغیرهای تحقیق حاضر دو طول آبشکن معادل 15 و 25 درصد عرض کانال آزمایشگاهی، سه فاصله قرارگیری معادل 3 ، 5 و 7 برابر طول آبشکن، در دو زاویه قرارگیری قائم و جاذب در عمق 3 سانتی متر از بستر بوده است که در یک فلوم با نسبت 4 ، عرض 7/0 متر و عمق آب 12/0 متر مورد بررسی قرار گرفت. نتایج صحت سنجی مدل حاکی از مطابقت مناسب میان نتایج مدل عددی و آزمایشگاهی می باشد. نتایج نشان می دهد در شرایط با افزایش فاصله میان آبشکن ها سرعت جریان میان آبشکن ها افزایش یافته و همچنین منجر به افزایش سرعت در دماغه آبشکن ها در حدود 75 سانتی متر در ثانیه می گردد. همچنین نتایج نشان می دهد با قرارگیری آبشکن ها به صورت جاذب حداکثر سرعت به سمت قوس خارجی و داغه آبشکن ها کشیده می شود لذا در این حالت مخرب ترین حالت برای آبشکن ها می باشد. Manuscript profile -
Open Access Article
49 - Experimental Study of Interfacial Friction Factor and Shear Stress in Counter-current Two-phase Flow in a Vertical Pipe
Arash Ghafouri Ashkan Ghafouri Abbas kosarineia Alireza Daneh-DezfuliIn the experimental study, the formation of the annular flow pattern in a vertical pipe with the counter-current two-phase flow has been investigated with the help of image recording and processing techniques. After separating the created two-phase flow regime, the rang MoreIn the experimental study, the formation of the annular flow pattern in a vertical pipe with the counter-current two-phase flow has been investigated with the help of image recording and processing techniques. After separating the created two-phase flow regime, the range of superficial velocity of air (upward) and water (downward) is 3.66-20.94 m/s and 0.06-0.31m/s for annular flow, respectively. The interfacial friction factor (liquid and gas phase) has been evaluated according to the hydrodynamic parameters of the flow. Comparing the average deviation of the results obtained from the current research with the previous research shows that the results are in good agreement. Also, the interfacial shear stress has been calculated and evaluated for two test pipes in the center-current two-phase flow pattern in the annular flow regime. In this research, the interfacial friction factor (liquid and gas phase) is also presented as a new correlation depending on the Reynolds number of the gas flow and the Reynolds number of the liquid flow with a coefficient of determination of R2=0.98. Manuscript profile -
Open Access Article
50 - Investigation of effective parameters (pipe diameter and fluid velocity) on the Simulation of water hammer phenomenon in water pipeline
Nima Asadi Dehmirahmadi Yousof EsmaeiliDue to the importance of water hammer in pipe network and pipe containing liquids in this paper, the diameter of pipe and the velocity of fluid were considered experimentally in laboratory and simulated the problem in HAMMER software. In this study, the tests were carri MoreDue to the importance of water hammer in pipe network and pipe containing liquids in this paper, the diameter of pipe and the velocity of fluid were considered experimentally in laboratory and simulated the problem in HAMMER software. In this study, the tests were carried out with six different types of materials (Brass, Carbon Steel, Copper, Five layer and PVC). It was assumed that valve which causes water hammer was closed fast. Also, how valve closing, is another important issue for this phenomenon. The tests in two modes slow and fast closing valve results showed if it takes more time to close, water hammer is less and the waves would fade faster. Also by examining the results indicate that the diameter of the pipes increasing pipe's diameter, increases the mess flow and fluid's velocity therefore effect of water hammer increases. This phenomenon shows that effect of increasing fluid velocity is more powerful than increasing pipe diameter. Manuscript profile -
Open Access Article
51 - Critical velocity analysis of Fluid-containing Pipe with Non-Classical Boundary Conditions
shahrokh shams Sajad Jangravicalculating the critical velocity of fluid-containing pipes is an important issue in engineering. For this purpose, the critical velocity of fluid-containing pipes with Non-classical boundary conditions is investigated. The equation of motion is based on the Euler-Berno Morecalculating the critical velocity of fluid-containing pipes is an important issue in engineering. For this purpose, the critical velocity of fluid-containing pipes with Non-classical boundary conditions is investigated. The equation of motion is based on the Euler-Bernoulli beam model. Non-classical boundary conditions include conditions such as Translational springs, torsional springs, concentrated mass and dampers. In order to calculate the critical velocity the frequency equation is solved numerically. when real part of frequency equation reaches zero, the critical velocity in the pipe appears and the system becomes unstable.influence of various parameters including spring hardness and concentrated mass on critical velocity is investigated and comparative diagrams of different spring hardnesses and concentrated mass are drawn. The results show that the critical velocity in the Translational double-ended state is higher than the torsional spring-concentrated mass and torsional springconcentrated mass boundary condition . The results also indicate a significant decrease in the frequency in the non-classical boundary condition compare to classical boundary condition. Manuscript profile -
Open Access Article
52 - The study of the vibration of the floating structure due to the excitation of the propeller using numerical analysis of fluid-structure (FSI)
Mahdiesadat Azizai Yousef Amirian Abdolhossein FereidoonVibration of floating structures under the effect of propeller excitation is One of the main issues in the design of floating structures and not paying attention to this issue and the placement Super structure at the bottom of the float, vibrations caused by the stimulu MoreVibration of floating structures under the effect of propeller excitation is One of the main issues in the design of floating structures and not paying attention to this issue and the placement Super structure at the bottom of the float, vibrations caused by the stimulus of the fan can cause problems for crews and individuals and the vibrations from the propeller make noise and also reduce the life of existing machines in the bottom of the float. In this paper the vibrations caused by the propeller stimulation, using a numerical analysis of fluid-structure on a commercial vessel is studied and the results are discussed. First with respect to the geometry and condition a suitable propeller was chosen for the float and the numerical solution for different speeds of the float and the angular velocity of the impeller is done. The floating structure is designed based on the standard and discretization is conducted using finite element. Pressure distribution on the propeller and hull obtained from the numerical solution of fluid flow, has been applied to floating structures in the structural analysis and floating structures due to harmonic loading induced by the rotation of the propeller is investigated and modal analysis of floating structures has been performed And the results of its analysis in a frequency range including natural frequencies that canaries in different modes and rotational speeds of the propeller were recorded. The Results show that in some rotational speeds of the propeller excitation frequency in rotational speed can lead to vibration increase and resonance amplitude The results are compared with the standard range, the results show that with accurate choosing of the propeller And the range of allowable angular velocity and optimization of the structure, we can provide the Requirements for vibration exposure in the limited range. Manuscript profile -
Open Access Article
53 - Time series modeling of Alborzs crustal velocity by using artificial neural networks
Tohid malekzadeh Dilmaghani -
Open Access Article
54 - Modeling of time series of Earth crust velocity field in Azarbaijan using multilayer neural network with PSO training algorithm
Tohid malekzadeh Dilmaghani -
Open Access Article
55 - Trajectory Planning Using High Order Polynomials under Acceleration Constraint
Hossein Barghi Jond Vasif V. Nabiyev Rifat Benveniste -
Open Access Article
56 - The Validity Assessment of Laboratory Shear Modulus Using In-Situ Seismic Piezocone Test Results
Seyed Majdedin Mir Mohammad Hosseini A.A. Hajimohammadi -
Open Access Article
57 - Evaluating the Liquefaction Potential of Soil in the South and Southeast of Tehran based on the Shear Wave Velocity through Empirical Relationships
M Khalili Noutash R Dabiri M Hajialilue Bonab -
Open Access Article
58 - Assessment of Subsurface Explosion caused by Tunnel Construction in Urban Areas
Hossein Haghighimanesh Mohammad Azadi -
Open Access Article
59 - Investigation of oxidation behavior and Thermal spray of mechanically milled CoNiCrAlY–YSZ powders
Mostafa Tahari Morteza Shamanian Esfahani Mehdi Salehi -
Open Access Article
60 - Effects of Colliding Particle Size and Velocity on Mechanical Properties of AZ31 after Surface Mechanical Attrition Treatment: Molecular Dynamics Simulation
Ali Kazemi Ali Heidari Kamran Amini Farshid Aghadavoudi Mohsen Loh-Mousavi -
Open Access Article
61 - Designing and Manufacturing the Multiple Jets Simulator and Experimental Investigation of the Multiple Jets in Crossflow
Saeed Toolani Mohamad Hojaji -
Open Access Article
62 - Potential of Soil Liquefaction Assessment in Chalus and Nowshahr Region during an Earthquake using Shear Wave Velocity (Vs) Method
Narges Afsari samid alizadeh Liquefaction is one of the most common ground deformation effects of earthquakes often a major cause of damage and destruction to buildings and infrastructures. The area on the study (Chalus and Nowshahr region) is located on the coastal strip o More Liquefaction is one of the most common ground deformation effects of earthquakes often a major cause of damage and destruction to buildings and infrastructures. The area on the study (Chalus and Nowshahr region) is located on the coastal strip of Caspian Sea, on the loose alluvial material which has been hit by numerous earthquakes throughout history. In this study, the shear wave velocity (Vs) method has been used with five experimental relationships to evaluate the soil liquefaction potential of Chalus and Nowshahr region under the assumption of non-cementation and cementation conditions. Due to the distribution of boreholes evaluated in the sediment section of the area which is less than 10,000 years old, solutions with non-cemented conditions are acceptable. Analyses have shown that among 46 borehole loops, 35 boreholes are prone to liquefaction, which most of them are located in the region of Nowshahr. Considering the values of the liquefaction potential index obtained, based on the shear wave velocity method, in non-cementation conditions, 8.7% of area is PL = 0, 15.2%, in the range of 5> PL> 0, 41.3% in the range of 15> PL> 5 and 34.8% in the range of 15< PL. Due to the fact that the surface depth is an important parameter in soil lubricity, and the high level of the station, considering the high potential of seismicity of the area as well, the likelihood of liquefaction increases. Manuscript profile -
Open Access Article
63 - Analysis of FGM Beam by FEM Method Applying Abacus Software
mehdi ghohyeei Seyed Alireza Mohajerani Saeed Jafari Mehr Abadi behnaz ghohyeeiLow–velocity foreign object impact damage is one of the most important issues in composite materials used in military and civil structures. Fiber composites are strong sheets, which are subjected to impact loads, to reduce the damage of the impact using hard resin MoreLow–velocity foreign object impact damage is one of the most important issues in composite materials used in military and civil structures. Fiber composites are strong sheets, which are subjected to impact loads, to reduce the damage of the impact using hard resins. In this research, low-speed bullet impact to six beams with FGM layering whose modulus of elasticity in the beam thickness varies from ceramic to metal and the response of the beams to low velocity impact has been investigated by finite element method using Abacus software. The strain, displacement and tension of the beam have been analyzed in two modes of the last layer of the metal and ceramic – metal. A comparison of displacement, tension and strain diagrams along the length of the beam for the six beams has been made. It was observed that the higher the properties of the metal than the ceramic, the higher the amount of displacement and tension and the strain in the beam decreased with increasing degree of ceramic properties compared to the metal. Manuscript profile -
Open Access Article
64 - مطالعه اثرات دوره سرمایی بر کیفیت اسپرم بزهای سانن و جاموناپاری
تی. اسواراموهان کا. نیلانی پی. سورکا پی. ماهادوان ک. بالاسوبرامانیامهدف از مطالعه حاضر آزمودن اثرات دوره سرمایی بر کیفیت منی بزهای سانن و جاموناپاری بود. منی نژادهای بز با استفاده از واژن مصنوعی جمعآوری و در دمای 5 تا 9 درجه سانتیگراد سرد شد. حجم، رنگ و pH منی تازه تعیین شد. پس از رقیقسازی، آزمایش میکروسکپی از نظر تحرک پیشرونده و زند Moreهدف از مطالعه حاضر آزمودن اثرات دوره سرمایی بر کیفیت منی بزهای سانن و جاموناپاری بود. منی نژادهای بز با استفاده از واژن مصنوعی جمعآوری و در دمای 5 تا 9 درجه سانتیگراد سرد شد. حجم، رنگ و pH منی تازه تعیین شد. پس از رقیقسازی، آزمایش میکروسکپی از نظر تحرک پیشرونده و زندهمانی اسپرم صورت گرفت. منی رقیق شده دو نژاد به وسیله آزمایش میکروسکپی از روز 0 تا 3 سرمادهی مورد مقایسه قرار گرفت. هموسایتومتر جهت ارزیابی شمار اسپرمها با استفاده از 10 میکرولیتر منی بارگذاری شد. از رنگآمیزی ائوزین (1 درصد) برای تخمین اسپرمهای زنده استفاده شد. گرچه زندهمانی و سرعت حرکت اسپرمهای دو نژاد بز به طور وابسته به زمان در طی سرمادهی کاهش یافت (05/0>P)، زندهمانی بین بزهای سانن و جاموناپاری به طور معنیدار تفاوت نداشت. در هرحال، تفاوت معنیداری برای میانگینهای سرعت حرکت اسپرم مشاهده شد (05/0>P). تحرک پیشرونده و زندهمانی به طور تدریجی در طی سرمادهی در 5 تا 9 درجه سانتیگراد کاهش داشت. به منظور کسب نرخ موفق بالاتر تلقیح، باید منی سرمادهی شده بز برای دامداران در طی یک روز فراهم شود. Manuscript profile -
Open Access Article
65 - Capability of f-k and SPAC methods in determining shear wave velocity of subsurface soil
Mehran Esfahanizadeh Mohammad Davoodi Ebrahim Haghshenas Mohammad Jafari -
Open Access Article
66 - Velocity Distribution in the 90-degree Bend based on the Probability and Entropy Concept
S. Sadeghfam Y. Hassanzadeh , M. Moazamnia -
Open Access Article
67 - Water Velocity Measurements in Open Channels Using Volumetric Current Meter (VCM)
Seyyed Ali Akbar Moosavi Mohammad Abdolahipour-Haghighi Gholamreza Mohammadi -
Open Access Article
68 - 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
69 - Application of Soft Computing Methods in the Analysis of Velocity Field in Dividing Channel
Sohrab Karimi Hossein Bonakdari Hojat Karami Amir Hossein Zaji -
Open Access Article
70 - Discharge Estimation by using Tsallis Entropy Concept
M Moazamnia H Bonakdari -
Open Access Article
71 - Numerical Simulation of Sediment Distribution and Transmission in Pre-Sedimentation basins Using FV Method and Comparison with the Experimental Results
Mohammad Reza Borna Mohammad Reza Pirestani -
Open Access Article
72 - A study on dust event over Kermanshah station and its relation to jet stream, March 27, 2003
N. Seyedzadeh Agdam P. S. Katirai A. Ranjbar Saadat AbadiThis study was on dust in Kermanshah synoptic station in March 27, 2003. Mean daily 500hpa geopotential height, mean sea level and 250hpa wind field maps analysis showed a middle atmospheric trough over Black Sea and the north of the Mediterranean Sea which is consisten MoreThis study was on dust in Kermanshah synoptic station in March 27, 2003. Mean daily 500hpa geopotential height, mean sea level and 250hpa wind field maps analysis showed a middle atmospheric trough over Black Sea and the north of the Mediterranean Sea which is consistent with a middle atmospheric low pressure over Iraq, east of Turkey and north of Saudi Arabia. In addition, the divergence of subtropical jet stream in 200hpa level and polar front jet stream in 250hpa level is the most important reason for convergence and induced upward motions over deserts in Iraq, Syria and Jordan, between 35-50 ° longitudes and 30-35 ° latitudes. The intensity of dust was related to the vertical angle between the center of the surface low pressure and 500hpa level low geopotential height. Manuscript profile -
Open Access Article
73 - بررسی تحلیلی و عددی تأثیر تراکم پرتابه بر توانایی نفوذ آن در زره پوش آلومینا
حسین کیا علی مهدی پور عمرانی -
Open Access Article
74 - EFFECTS OF MAGNETIC FIELD ON THE RED CELL ON NUTRITIONAL TRANSPORT IN CAPILLARY-TISSUE EXCHANGE SYSTEM
Nirmala P Ratchagar Vijaya Kumar -
Open Access Article
75 - MATHEMATICAL ANALYSIS OF NEWLY DESIGNED TWO POROUS LAYERS SLIDER BEARING WITH A CONVEX PAD UPPER SURFACE CONSIDERING SLIP AND SQUEEZE VELOCITY USING FERROFLUID LUBRICANT
Rajesh Shah Ramesh C. Kataria -
Open Access Article
76 - Comparing Aerodynamic Terminal Velocity of Open and Closed Mouth Pistachio Nuts Using Wind Column
Kobra Heidarbeigi Sadegh SamadiDetermining the terminal velocity as one of the important aerodynamic properties of particles and grains is essential for pneumatic separation, grading, and handling. A wind tunnel system was used in the present research to measure the aerodynamic terminal velocity of p MoreDetermining the terminal velocity as one of the important aerodynamic properties of particles and grains is essential for pneumatic separation, grading, and handling. A wind tunnel system was used in the present research to measure the aerodynamic terminal velocity of pistachio nuts. Some physical properties were measured and calculated. The effects of pistachio mouth status at four levels (closed, open, and semi-open mouth, and shell) were investigated on its terminal velocity. The volume, mass and density of that were 1.33±0.37 cm3, 0.97±0.31 g and 0.72±0.18 g cm3-1, respectively. The average aerodynamic terminal velocity of pistachio was 9.43±1.38 m s-1. The aerodynamic terminal velocity of the pistachio had a direct relationship with the studied physical characteristics, except for density. The terminal velocity of open-mouth pistachio nuts (9.50±0.61 m s-1) was significantly lower than that of closed (10.12±0.51 m s-1) and semi-open mouth (10.16±0.62 m s-1) nuts, with the terminal velocity of the shells (6.51±0.65 m s-1) showing the lowest values. The results revealed that terminal velocity can be considered for pneumatic separation of shells from pistachio nuts as well as the separation of open-mouth nuts from closed-mouth ones. Manuscript profile -
Open Access Article
77 - Investigation of Microstructure of Alumina Single-Splate Made By Solution Precursor High-Velocity Flame Spraying
Saeid Taghi-ramezani Zia ValefiSolution precursor thermal Spraying (SPTS) processes are suitable methods for producing nano-structured coatings. Due to the uncompleted reactions such as solvent evaporation and pyrolysis of the precursor, achieving coatings with controlled properties at a satisfactory MoreSolution precursor thermal Spraying (SPTS) processes are suitable methods for producing nano-structured coatings. Due to the uncompleted reactions such as solvent evaporation and pyrolysis of the precursor, achieving coatings with controlled properties at a satisfactory precipitation rate remains an important challenge in these processes that needs to precise control of spray parameters. In this study, in order to investigate the effect of Solution precursor high velocity flame spraying parameters such as fuel and oxygen content, spraying distance and solution injection rate, single-scan spraying test was performed on glass substrates. The morphology of the formed splats and their structural characteristics were investigated using Scanning Electron Microscope (SEM). Structural comparison in the single-scan spraying test performed in two ratios of fuel to oxygen, showed that in the flame parameter with oxygen pressure of 6 bar and fuel 3 bar at the injection rate of Solution precursor 20 cm3/min and spray distance of 5 cm was selected as the optimal parameter. In this parameter, due to the low injection rate of the solution and higher heat transfer per drop of the solution precursor and completion of processes that resulting in melting and crystallization, the number of splats increased. Also, evaluation of single-scan spraying in the flame with oxygen pressure of 8 bar and fuel bar of 4 bar and spray distance of 5 cm showed that the injection rate of 40 cm3/min solution precursor would be more appropriate due to increasing the number of fine splats and improving coating efficiency. Manuscript profile -
Open Access Article
78 - کاهش ارتعاشات پوستههای استوانهای FGM هوشمند با استفاده از لایههای مگنتواستریکتیو
منصور درویزه رضا انصاری ابوالفضل درویزه رضا رجبیه فرددر این مقاله تحلیل رفتار ارتعاشی پوستههای استوانهای FGM هوشمند مجهز به لایههای سنسور و عملگر مگنتواستریکتیو مورد بررسی قرار گرفته است. به منظور کاهش ارتعاش، از یک کنترل تناسبی فیدبک منفی سرعت در تعامل با لایههای حسگر و عملگر استفاده شده است. برای لحاظ کردن اثرات ت Moreدر این مقاله تحلیل رفتار ارتعاشی پوستههای استوانهای FGM هوشمند مجهز به لایههای سنسور و عملگر مگنتواستریکتیو مورد بررسی قرار گرفته است. به منظور کاهش ارتعاش، از یک کنترل تناسبی فیدبک منفی سرعت در تعامل با لایههای حسگر و عملگر استفاده شده است. برای لحاظ کردن اثرات تغییر شکل برشی و عرضی و اینرسی دورانی، فرمولبندی مسئله براساس تئوری تغییر شکل برشی مرتبه اول موسوم به FSDT انجام شده است. پوستههای FGM مورد مطالعه ترکیبی از فلز و سرامیک در نظر گرفته شده است که خواص ساختاری آنها وابسته به دما و مدرج در جهت ضخامت پوسته استوانهای مطابق با کسر حجمی قانون توانی میباشد. لایههای مگنتواستریکتیو نیز از جنس ترفنول دی در نظر گرفته شدهاند. از روش انتگرال زمانی نیومارک و آنالیز مودال برای حل معادلات دیفرانسیل مربوطه به ترتیب در حوزه زمان و فرکانس استفاده شده است. اثرات مشخصههای کاهش ارتعاشات لایههای مگنتواستریکتیو در دو حوزه زمان و فرکانس، تأثیر موقعیت مکانی قرارگیری این لایهها، ضخامت آنها و پارامترهای کنترل مورد تحقیق قرار گرفتهاند. Manuscript profile -
Open Access Article
79 - تحلیل فرایند اکستروژن پیچشی در قالب با سطح مقطع بیضوی با استفاده از روش کران بالا
یاسر میرباقری حامد معصومی مجید سیدصالحیفرایند اکستروژن پیچشی روش جدیدی برای تولید فلزات و آلیاژهای شدیداً تغییرشکل یافته است. در این فرایند، تغییرشکل پلاستیک شدیدی با ماهیت برشی در ماده ایجاد می­شود. در این مقاله با پیشنهاد یک میدان سرعت مجاز، به همراه تکنیک کران بالا، مقدار انرژی لازم برای فرایند انجام Moreفرایند اکستروژن پیچشی روش جدیدی برای تولید فلزات و آلیاژهای شدیداً تغییرشکل یافته است. در این فرایند، تغییرشکل پلاستیک شدیدی با ماهیت برشی در ماده ایجاد می­شود. در این مقاله با پیشنهاد یک میدان سرعت مجاز، به همراه تکنیک کران بالا، مقدار انرژی لازم برای فرایند انجام اکستروژن پیچشی پیش­بینی می­شود. در مدل پیشنهادی امکان اعمال تغییر در پارامترهایی نظیر هندسه قالب و شرایط اصطکاک وجود دارد و تأثیر این عوامل بررسی شده است. بهعلاوه مدل حاضر پارامترهای بحرانی طراحی قالب را پیش­بینی می­کند. برای نشان دادن صحت عملکرد مدل، مقادیر پیش­بینی شده با نتایج حاصل از حل اجزای محدود مقایسه شده که مبین هماهنگی منطقی بین رفتار آن­ها در قالب میباشد. Manuscript profile -
Open Access Article
80 - The comparison of dominant and non-dominant hand velocity during Gyakuzuki technique in elite Karatekas
ُSalar Hariri Vahid Akbaree Rahim Teymuri Ali jahani