M. Ghadimi

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Finding any regularity in the sequences of proteins and determining their correlation with structural features are of great interest for an understanding of molecular biology. We statistically analyzed the relative frequencies of all 400 possible dipeptides in a data set containing randomly selected proteins of different defined structural classes including(More)
In this paper, variational iteration (VIM) and parametrized perturbation (PPM) methods have been used to investigate non-linear vibration of Euler-Bernoulli beams subjected to the axial loads. The proposed methods do not require small parameter in the equation which is difficult to be found for nonlinear problems. Comparison of VIM and PPM with Runge-Kutta(More)
In order to determine the preference or avoidance of the first and second positions of individual dipeptides for adopting different structural conformations, we randomly select defined structural groups of proteins from protein data bank and statistically analyzed the distribution of all 400 possible dipeptides in different secondary structural elements.(More)
Based on the method of characteristics, the system of Vlasov-Poisson equations is simulated. Two observed effects, Landau damping and development of BGK modes, are in good agreement with the reported theoretical and simulation results. Since we study high-frequency electron waves, ions are immobile and to simulate the electron motion, the following(More)
In this study, a nonlinear oscillation system is investigated with two analytical methods called Variational Iteration Method (VIM) and Variational Approach Method (VAM). The governing equation of system is obtained by using Lagrange method and then nonlinear governing equation is analyzed by VIM and VAM. The results reveal that the VIM and VAM can achieve(More)
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