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Qazvin, Iran

Imam Khomeini International University is one of the universities in Iran which was founded after the Islamic Revolution. The bill of IKIU’s constitution was ratified by The Iranian Parliament in January 1984. Constituent organs of IKIU include Board of trustees, president, and council. Deputies for Education, Research, and Students and Culture are some of the other departments of IKIU. In addition, the Science and Technology Park, and the central library with more than 100000 copies of books and magazines beside the other educational and research facilities provide great and ideal grounds for scientific and research activities for students. Bringing welfare for international students in addition to establish many dormitory complexes, IKIU has formed the Brilliant-Talent students’ Office to recognize top students and to support and guide the students, providing educational and welfare facilities. With seven faculties could, suitably, meet various educational preferences of students. Also, Persian Language Teaching Center which has been hosted students from more than ninety-six countries so far, enjoying equipped language labs, library, and computer site will, definitely, create a joyful and memorable atmosphere for students to learn Persian Language. Wikipedia.

Shivanian E.,Imam Khomeini International University
Engineering Analysis with Boundary Elements | Year: 2013

In this paper the meshless local radial point interpolation (MLRPI) method is applied to simulate a nonlinear partial integro-differential equation arising in population dynamics. This PDE is a competition model in which similar individuals are competing for the same resources. It is a kind of reaction-diffusion equation with integral term corresponding to nonlocal consumption of resources. In MLRPI method, it does not require any background integration cells so that all integrations are carried out locally over small quadrature domains of regular shapes, such as circles or squares in two dimensions and spheres or cubes in three dimensions. The point interpolation method is proposed to construct shape functions using the radial basis functions. A one-step time discretization method is employed to approximate the time derivative. To treat the nonlinearity, a simple predictor-corrector scheme is performed. Also the integral term, which is a kind of convolution, is treated by the cubic spline interpolation. The numerical studies on sensitivity analysis and convergence analysis show that our approach is stable. Finally, two numerical examples are presented showing the behavior of the solution and the efficiency of the proposed method. © 2013 Elsevier Ltd.

Shivanian E.,Imam Khomeini International University
Engineering Analysis with Boundary Elements | Year: 2015

In this article, a new spectral meshless radial point interpolation (SMRPI) technique is proposed and, as a test problem, applied to the two-dimensional diffusion equation with an integral (non-classical) condition. This innovative method is based on erudite combination of meshless methods and spectral collocation techniques but it is not traditional meshless collocation method. As the meshless method, the point interpolation method with the help of radial basis functions is used to construct shape functions as basis functions in the frame of spectral collocation methods. These basis functions (shape functions) have Kronecker delta function property. In the proposed method, high order derivatives (in high order partial differential equations) are evaluated by constructing and using operational matrices. In SMRPI method, it does not require any kind of integration locally over small quadrature domains as it is essential in Galerkin weak form meshless methods such as element free Galerkin (EFG) and meshless local Petrov-Galerkin (MLPG) methods. Also, it is not needed to determine shape parameter which is often played important role in these methods, for instance recall test (weight functions) for moving least squares (MLS) approximation in the frame of MLPG. Therefore, computational costs of SMRPI method is less expensive. A comparison study of the efficiency and accuracy of the present method and meshless local Petrov-Galerkin (MLPG) method is given by applying on mentioned diffusion equation. Convergence studies in the numerical examples show that SMRPI method possesses reasonable rate of convergence. © 2015 Elsevier Ltd, All rights reserved.

Shivanian E.,Imam Khomeini International University
Engineering Analysis with Boundary Elements | Year: 2014

This paper proposes an approach based on the Galerkin weak form and moving least squares (MLS) approximation to simulate three space dimensional nonlinear wave equation of the form utt+αut+βu=uxx+uyy+uzz+δg(u)ut+f(x,y,z,t),00 subject to given appropriate initial and Dirichlet boundary conditions. The main difficulty of methods in fully three-dimensional problems is the large computational costs. In the proposed method, which is a kind of Meshless local Petrov-Galerkin (MLPG) method, meshless Galerkin weak form is applied to the interior nodes while the meshless collocation method is used for the nodes on the boundary, so the Dirichlet boundary condition is imposed directly. In MLPG method, it does not require any background integration cells so that all integrations are carried out locally over small quadrature domains of regular shapes, such as circles or squares in two dimensions and spheres or cubes in three dimensions. The moving least squares approximation is proposed to construct shape functions. A two-step time discretization method is employed to approximate the time derivatives. To treat the nonlinearity, a kind of predictor-corrector scheme combined with one-step time discretization and Crank-Nicolson technique is adopted. Several numerical examples are presented and satisfactory agreements are achieved. © 2014 Elsevier Ltd.

Ebrahimi F.,Imam Khomeini International University
Mechanics of Advanced Materials and Structures | Year: 2013

This article presents an analytical investigation for a thermo-piezoelectrically actuated sandwich circular plate made of functionally graded material. Initial stress state and pre-vibration deformations of the simply supported FGM plate are determined by solving a nonlinear static problem. By adding an incremental dynamic state to the pre-vibration state, the governing differential equations are derived. The role of piezoelectric control voltage and thermal environment effects on nonlinear static deflections and natural frequencies imposed by the piezoelectric actuators using high input voltages are discussed. Numerical examples in dimensionless forms are provided and simulation results investigated. The good agreement between the results of this article and those of the finite element (FE) analyses validated the presented approach. In a parametric study the i is placed on investigating the effect of varying the gradient index of FG plate and applied piezoelectric actuator voltage as well as thermal environment on the vibration characteristics of the structure. © 2013 Taylor and Francis Group, LLC.

Bigdeli N.,Imam Khomeini International University
Renewable and Sustainable Energy Reviews | Year: 2015

In this paper, different optimal hybrid techniques have been proposed for management of a hybrid power generation system including photovoltaic (PV), fuel cell and battery. The main power of the hybrid system comes from the photovoltaic panels, while the fuel cell and batteries are used as back up units. In order to achieve maximum power point tracking for the photovoltaic system, both fuzzy logic controller and perturb and observation methods are examined and their performances have been investigated via simulations. Next, the performance of the hybrid system has been improved via employing a family of well-known optimization approaches for load sharing among the available resources. Imperialist Competitive Algorithm (ICA), Particle Swarm Optimization (PSO), Quantum behaved Particle Swarm Optimization (QPSO), Ant Colony Optimization (ACO), and Cuckoo Optimization Algorithm (COA) are used to manage the load sharing to achieve optimal performance while the system constraints are met. The optimal performance has been characterized via the control strategy performance measure being the ratio of the amount of hydrogen production with respect to the hydrogen consumption. In order to verify the system performance, simulation studies have been carried out using practical load demand data and real weather data (solar irradiance and air temperature). Different combination of maximum power point tracking methods with various optimization algorithms have been compared with each other. The results show that the combination of fuzzy logic controller with QPSO has the best performance among the considered combinations. In this situation, when the solar irradiation is noticeably high, the required load is supplied mainly by PV array, while the battery is charged, simultaneously. In the other times, the load is mainly fed by the battery and fuel cell while the performance constraints of battery is met and the daily performance measure is optimized. © 2014 Elsevier Ltd.

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