Imam Khomeini International University

www.ikiu.ac.ir
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.

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Ebrahimi F.,Imam Khomeini International University | Barati M.R.,Imam Khomeini International University
European Physical Journal Plus | Year: 2016

In this work, a size-dependent curved beam model is developed to take into account the effects of nonlocal stresses on the buckling behavior of curved magneto-electro-elastic FG nanobeams for the first time. The governing differential equations are derived based on the principle of virtual work and Euler-Bernoulli beam theory. The power-law function is employed to describe the spatially graded magneto-electro-elastic properties. By extending the radius of the curved nanobeam to infinity, the results of straight nonlocal FG beams can be rendered. The effects of magnetic potential, electric voltage, opening angle, nonlocal parameter, power-law index and slenderness ratio on buckling loads of curved MEE-FG nanobeams are studied. © Società Italiana di Fisica / Springer-Verlag 2016.


Ebrahimi F.,Imam Khomeini International University | Reza Barati M.,Imam Khomeini International University
European Physical Journal Plus | Year: 2016

In this paper, thermal vibration behavior of functionally graded (FG) nanobeams exposed to various kinds of thermo-mechanical loading including uniform, linear and non-linear temperature rise embedded in a two-parameter elastic foundation are investigated based on third-order shear deformation beam theory which considers the influence of shear deformation without the need to shear correction factors. Material properties of FG nanobeam are supposed to be temperature-dependent and vary gradually along the thickness according to the Mori-Tanaka homogenization scheme. The influence of small scale is captured based on nonlocal elasticity theory of Eringen. The nonlocal equations of motion are derived through Hamilton’s principle and they are solved applying analytical solution. The comparison of the obtained results is conducted with those of nonlocal Euler-Bernoulli beam theory and it is demonstrated that the proposed modeling predicts correctly the vibration responses of FG nanobeams. The influences of some parameters including gradient index, nonlocal parameter, mode number, foundation parameters and thermal loading on the thermo-mechanical vibration characteristics of the FG nanobeams are presented. © 2016, Società Italiana di Fisica and Springer-Verlag Berlin Heidelberg.


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
Ocean Engineering | Year: 2014

In this paper, the meshless local radial point interpolation (MLRPI) method is applied to simulate three space dimensional nonlinear wave equation of the form utt+αut+βu=uxx+u yy+uzz+δg(u)ut+f(x,y,z,t), 00 subject to given appropriate initial and Dirichlet boundary conditions and then a new spectral meshless radial point interpolation (SMRPI) method is proposed to solve the mentioned problem. The main drawback of methods in fully 3-D problems is the large computational costs. In the MLRPI method, all integrations are carried out locally over small quadrature domains of regular shapes such as spheres or cubes. In innovative SMRPI method, it is not needed to any integration. The radial point interpolation method is proposed to construct shape functions for MLRPI and basis functions for SMRPI. A weak formulation with a Heaviside step function transforms the set of governing equations into local integral equations on local subdomains in MLRPI whereas the operational matrices converts easily the governing equations (even high order) into linear system of equations in SMRPI. A two-step time discretization method is employed to approximate the time derivatives. To treat the nonlinearity part, a kind of predictor-corrector scheme combined with one-step time discretization and Crank-Nicolson technique is adopted. A comparison study of the efficiency and accuracy of the MLRPI and SMRPI method is given by applying on mentioned problem. Convergence studies in the numerical examples show that the SMRPI method possesses excellent rates of convergence. © 2014 Elsevier Ltd.


Shivanian E.,Imam Khomeini International University | Abbasbandy S.,Imam Khomeini International University
Nonlinear Analysis: Real World Applications | Year: 2014

The purpose of the present paper is to give a proof for a systematic method namely, predictor homotopy analysis method (PHAM) to predict the multiplicity of the solutions of two points nonlinear second order boundary value problems of type u″=f(x,u,u′). We present briefly the method first, and then some theorems are given to clarify this issue that, how one can predict the existence of the multiple solutions and obtain them simultaneously as well. © 2011 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.


Kazemi R.,Imam Khomeini International University
Match | Year: 2014

The second Zagreb index of (molecular) graph G is equal to the sum of the products of the degrees of pairs of adjacent vertices. In this paper, we study the second Zagreb index of molecular graphs with tree structure. Exactly, we obtain the average and variance of this index in a randomly chosen molecular graph with n vertices. Also, the asymptotic normality of the second Zagreb index is given.


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.


Abdi S.,Imam Khomeini International University | Afshar K.,Imam Khomeini International University
International Journal of Electrical Power and Energy Systems | Year: 2013

Determination of optimal location and size of Distributed Generations (DGs) is one of the major problems of distribution utilities. In this paper, a multi-objective methodology for optimal distributed generation allocation and sizing in distribution systems is proposed. The objective function is considered willing to minimize the costs of active and reactive losses, and to improve the voltage profile and reliability of the distribution systems. Besides, the effect of load models is considered in the optimal DG allocation. A hybrid method based on improved particle swarm optimization (IPSO) algorithm and Monte Carlo simulation is proposed for solving the problem. The proposed algorithm is applied to the practical 33-bus distribution system and results are compared with other versions of PSO and artificial bee colony (ABC) algorithm. Numerical studies are representing of the effectiveness and out-performance of the proposed method. © 2012 Elsevier Ltd. All rights reserved.

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