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Arnous A.H.,Higher Institute of Engineering | Mahmood S.A.,University of Punjab | Younis M.,University of Punjab
Superlattices and Microstructures | Year: 2017

This article studies the dynamics of optical solitons in dual-core fibers with group velocity mismatch, group velocity dispersion and linear coupling coefficient under Kerr law nonlinearity via two integration schemes, namely, Q-function scheme and trial solution approach. The Q-function scheme extracts dark and singular 1-soliton solutions, along with the corresponding existence restriction. This scheme, however, fails to retrieve bright 1-soliton solution. Moreover, the trial solution approach extracts bright, dark and singular 1-soliton solutions. The constraint conditions, for the existence of the soliton solutions, are also listed. Additionally, a couple of other solutions known as singular periodic solutions, fall out as a by-product of this scheme. The obtained results have potential applications in the study of solitons based optical communication. © 2017 Elsevier Ltd


El-Bassuony A.A.H.,Cairo University | Abdelsalam H.K.,Higher Institute of Engineering
Journal of Alloys and Compounds | Year: 2017

The formation of double nanometric delafossite of AgFeO2 was prepared by an easy and low-cost method which is flash auto-combustion technique with urea as a fuel. X-ray diffraction pattern (XRD) revealed single phase structure for all samples. The morphology was analyzed by Field Emission Scanning Electron Microscopy (FESEM) and clarified the hexagonal platelet shape for AgFeO2 and cubic shape for the doubled delafossite Ag2Fe2O4. The composition of the samples was determined using Energy dispersive X-ray (EDX). The particle size estimated from FESEM and XRD analysis, provide that the samples are in nanoscale. The magnetic hysteresis loop of the samples was measured at room temperature (300 K) and at low temperatures (200 K and 100 K) by maximum field 20 kG. Same behavior of hysteresis loop was observed for all samples at 300 K but at low temperatures (200 K and 100 K) Ag2Fe2O4 nanoparticle has higher saturation magnetization and slightly larger coercive field than that of AgFeO2. The optical properties were measured for the investigated samples. The application of this study promotes the use of AgFeO2 and Ag2Fe2O4 in the solar cell. © 2017 Elsevier B.V.


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

The heat transfer characteristics of a couple-stress fluid (CSF) in a two-dimensional asymmetric channel is analyzed. The channel asymmetry is produced by choosing the peristaltic wave train on the walls to have different amplitudes and phase. Mathematical modeling corresponding to the two-dimensional couple stress fluid is made. Analytical expressions for the axial velocity, stream function, heat transfer, and the axial pressure gradient are established using long wavelength assumption. Numerical computations have been carried out for the pressure rise per wavelength. The influence of various parameters of interest is seen through graphs on frictional forces, pumping and trapping phenomena, and temperature profile. Copyright © 2013 by ASME.


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.


Zobaa A.F.,Brunel University | Abdel Aleem S.H.E.,Higher Institute of Engineering
IEEE Transactions on Industrial Informatics | Year: 2014

In view of many problems associated with harmonics pollution within industrial firms, the development of new passive and/or hybrid filtering techniques of higher quality, higher efficiency, and lower cost is a necessity for the forthcoming power quality age. This article suggests a hybrid passive filter, which consists of a certain combination of a shunt passive filter (SPF) with a series passive portion as a substitute to overcome the shortcomings of conventional shunt passive filtering techniques. Constrained optimization is used to find the optimal sizing of parameters of the hybrid passive filter in order to reduce both harmonic voltages and harmonic currents in the power system to an acceptable level, as well as to improve the load power factor. The optimal design of the hybrid passive filter and its feasibility are compared with those of the C-type passive filter and the conventional SPF by means of four study cases taken from existing publications. Several simulation results are shown in order to highlight the viability of the proposed filter. © 2014 IEEE.


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.


Elmathana M.T.,Brunel University | Zobaa A.F.,Brunel University | Abdel Aleem S.H.E.,Higher Institute of Engineering
Proceedings of International Conference on Harmonics and Quality of Power, ICHQP | Year: 2012

Passive harmonic filters are commonly used as an effective solution in the power quality markets; however, the selection of capacitive component values in the multi-arm filter is usually a matter of trial and error. Someone can propose all capacitive components to be equal, but it has been observed that a better performance is obtained with unequal values. Different topologies which allow appropriate estimations of the capacitors values have been published. Each topology has its advantages and disadvantages. This paper presents an optimal design of passive harmonic filter parameters on the economical basis to guarantee the minimum cost and the minimum losses. The performance of the proposed filter is discussed and compared with other conventional technique using a real case study. © 2012 IEEE.


Elwan S.K.,Higher Institute of Engineering | Rashed A.S.,Higher Institute of Engineering
Structural Engineering and Mechanics | Year: 2011

This paper aims to study the behavior of short reinforced concrete columns confined with external glass Fiber Reinforced Polymers (GFRP) sheets under eccentric loads. The experimental part of the study was achieved by testing 9 specimens under eccentric compression. Three eccentricity ratios corresponding to e/t = 0, 0.10, 0.50 in one direction of the column were used. Specimens were divided into three groups. The first group was the control one without confinement. The second group was fully wrapped with GFRP laminates before loading. The third group was wrapped under loading after reaching 75% of failure loads of the control specimens. The third group was investigated in order to represent the practical case of strengthening a loaded column with FRP laminates. All specimens were loaded until failure. The results show that GFRP laminates enhances both failure load and ductility response of eccentrically loaded column. Moreover, the study also illustrates the effect of confinement on the first crack load, lateral deformation, strain in reinforcement and failure pattern. Based on the analysis of the experimental results, a simple model has been proposed to predict the improvement of load carrying capacity under different eccentricity ratios. The predicted equation takes into consideration the eccentricity to cross section depth ratio, the ultimate strength of GFRP, the thickness of wrapping laminate, and the time of wrapping (before loading and under loading). A good correlation was obtained between experimental and analytical results.


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.,Al - Azhar University of Egypt | Husseny S.Z.-A.,King Abdulaziz University | Abd El Lateef A.I.,Higher Institute of Engineering
Applied Bionics and Biomechanics | Year: 2011

Peristaltic transport of an incompressible viscous fluid due to an asymmetric waves propagating on the horizontal sidewalls of a rectangular duct is studied under long-wavelength and low-Reynolds number assumptions. The peristaltic wave train on the walls have different amplitudes and phase. The flow is investigated in a wave frame of reference moving with velocity of the wave. The effect of aspect ratio, phase difference, varying channel width and wave amplitudes on the pumping characteristics and trapping phenomena are discussed in detail. The results are compared to with those corresponding to Poiseuille flow. © 2011 IOS Press and the authors. All rights reserved.

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