Time filter

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Abd El-Monsef M.E.,Tanta University | El Safty M.,Higher Institute of Engineering | Swealam M.,Tanta University
Journal of Convergence Information Technology | Year: 2012

In this paper, we expand our work to introduce topological methods for knowledge reduction. The suggested method based on neighbourhoods and approximations. We give a comparison between previous reduction and our methods in the process of knowledge reduction in information systems. Examples are given to show the differences between the extracted rules.

Abdel Aleem S.H.E.,Higher Institute of Engineering | Zobaa A.F.,Brunel University | Zobaa A.F.,Cairo University | Abdel Aziz M.M.,Cairo University
IEEE Transactions on Industrial Electronics | Year: 2012

In its broadest sense, passive filters have been a very potent technique for power system harmonic suppression because of their possible different frequency response characteristics that can achieve a certain required harmonic filtering target, also due to their simplicity and economical cost. This paper presents an application of FORTRAN feasible sequential quadratic programming to find the optimal sizing of parameters of C-type passive filters for minimizing the total voltage harmonic distortion of nonlinear loads, where maintaining a given power factor at a specified range is desired. The optimal design of the C-type passive filter as an alternative to the conventional passive filtering techniques is introduced, and a detailed comparison of the results between an uncompensated system and a C-type filter are discussed by means of different numerical examples, considering source and load nonlinearities, while taking into account compliance with the IEEE standards 519-1992 and 18-2002. © 2011 IEEE.

Arnous A.H.,Higher Institute of Engineering | Mirzazadeh M.,Guilan University
Mathematical Methods in the Applied Sciences | Year: 2015

In this paper, the Bäcklund transformation of fractional Riccati equation is presented to establish traveling wave solutions for two nonlinear space-time fractional differential equations in the sense of modified Riemann-Liouville derivatives, namely, the space-time fractional generalized reaction duffing equation and the space-time fractional diffusion reaction equation with cubic nonlinearity. The proposed method is effective and convenient for solving nonlinear evolution equations with fractional order. Copyright © 2014 John Wiley & Sons, Ltd.

Mekheimer K.S.,Taif University | Mekheimer K.S.,Al - Azhar University of Egypt | Abd Elmaboud Y.,Assiut University | Abd Elmaboud Y.,King Abdulaziz University | Abdellateef A.I.,Higher Institute of Engineering
Applied Bionics and Biomechanics | Year: 2013

This paper discusses the effect of peristaltic transport on the fluid flow in the gap between two eccentric tubes (eccentric-annulus flows). The inner tube is uniform, rigid, while the outer tube has a sinusoidal wave traveling down its wall. The flow analysis has been developed for low Reynolds number and long wave length approximation. The velocity and the pressure gradient have been obtained in terms of the dimensionless flow rate \overline{Q}, time t, azimuthal coordinate and eccentricity parameter ε (the parameter that controls of the eccentricity of the inner tube position). The results show that there is a significant deference between eccentric and concentric annulus flows. © 2013 - IOS Press and the authors. All rights reserved.

Zobaa A.F.,University of Exeter | Abdel Aziz M.M.,Cairo University | Abdel Aleem S.H.E.,Higher Institute of Engineering
Electric Power Components and Systems | Year: 2010

The existence of harmonics in power systems and their effects have led to opulent issues of electric power quality. In this article, an optimization approach using FORTRAN feasible sequential quadratic programming to maximize the power factor at the DC drive loads terminals is presented using different passive filter topologies. Many constraints are taken into consideration such as series/parallel resonance conditions, effect of the supply frequency, and non-linearities of the supply and the load. Also, a detailed comparison of the simulated results for shunt- and series-passive filters is also presented in this article. The general compensation characteristics and the detailed comparison are discussed by means of different numerical examples from previous publications.

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