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Darvishi M.T.,Razi University | Khani F.,Ilam University | Khani F.,Bakhtar Institute of Higher Education | Hamedi-Nezhad S.,Bakhtar Institute of Higher Education | Ryu S.-W.,Chonnam National University
International Journal of Computer Mathematics | Year: 2010

We present an efficient modification of the He's homotopy perturbation method that will facilitate the calculations. We apply this modification to solve sine-Gordon and coupled sine-Gordon equations, numerically. The new modification introduces a promising tool for many non-linear problems. The present method performs extremely well in terms of accuracy, efficiency, simplicity and reliability. © 2010 Taylor & Francis.

Aziz A.,Gonzaga University | Khani F.,Bakhtar Institute of Higher Education | Darvishi M.T.,Razi University
Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences | Year: 2010

The homotopy analysis method (HAM) has been used to develop an analytical solution for the thermal performance of a circular-thin-foil heat flux gage with temperature dependent thermal conductivity and thermal contact resistance between the edge of the foil and the heat sink. Temperature distributions in the foil are presented illustrating the effect of incident heat flux, radiation emission from the foil, variable thermal conductivity, and contact resistance between the foil and the heat sink. The HAM results agree up to four places of decimal with the numerical solutions generated using the symbolic algebra package Maple. This close comparison vouches for the high accuracy and stability of the analytic solution. © 2010 Verlag der Zeitschrift für Naturforschung, Tübingen.

Hamedi-Nezhad S.,Bakhtar Institute of Higher Education | Sofla M.Z.,Islamic Azad University | Kavitha L.,Central University of Costa Rica | Kumar V.S.,Periyar University
Communications in Theoretical Physics | Year: 2014

In the present work, we examine the soliton excitations in the relativistic Toda lattice model using the rotational expansion method, where the coupling between the lattice sites is varied. For specific choices of the coupling strength we proceed to analyze the nonlinear wave excitations arising in the model which are found to be dark, singular and periodic solitary wave profiles. These solitary wave profiles are admitted to show possible modulation in its amplitude. © 2014 Chinese Physical Society and IOP Publishing Ltd.

Panjsetooni A.,Bakhtar Institute of Higher Education | Bunnori N.M.,Universiti Sains Malaysia | Vakili A.H.,Universiti Sains Malaysia
The Scientific World Journal | Year: 2013

Acoustic emission (AE) technique is one of the nondestructive evaluation (NDE) techniques that have been considered as the prime candidate for structural health and damage monitoring in loaded structures. This technique was employed for investigation process of damage in reinforced concrete (RC) frame specimens. A number of reinforced concrete RC frames were tested under loading cycle and were simultaneously monitored using AE. The AE test data were analyzed using the AE source location analysis method. The results showed that AE technique is suitable to identify the sources location of damage in RC structures. © 2013 Alireza Panjsetooni et al.

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