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Applied mathematics and mechanics(English Edition) 2011年第2期32卷 179-188页

作者： S.m.ABDEL-GAIED m.r.eid Department of Science and mathematics Faculty of EducationAssiut University

Numerical analysis of the free convection coupled heat and mass transfer is presented for non-Newtonian power-law fluids with the yield stress flowing over a two-dimensional or axisymmetric body of an arbitrary shape in a fluid-saturated porous medium. The governing boundary layer equations and boundary conditions are cast into a dimensionless form by the similarity transformation. The resulting system of equations is solved by a finite difference method. The parameters studied are the rheological constants, the buoyancy ratio, and the Lewis number. representative velocity, temperature, and concentration profiles are presented and discussed. It is found that the results depend strongly on the values of the yield stress parameter and the power-law index of the non-Newtonian fluid.

关键词： non-Newtonian fluid porous medium yield stress

外形任意的多孔介质轴对称物体中充满非Newton幂律流体时的自然对流

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应用数学和力学 2011年第2期32卷 171-179页

作者： S·m·阿布德尔-盖德 m·r·伊德艾斯尤特大学教育学院科学与数学系新谷72111埃及

在一个轴对称、外形任意的多孔介质二维体中,充满了有屈服应力的非Newton幂律流体时,数值分析其自由对流及其传热/传质问题.利用相似变换,将边界层控制方程及其边界条件变换为无量纲形式,然后用有限差分法求解该方程组.所研究的参数为... 详细信息

在一个轴对称、外形任意的多孔介质二维体中,充满了有屈服应力的非Newton幂律流体时,数值分析其自由对流及其传热/传质问题.利用相似变换,将边界层控制方程及其边界条件变换为无量纲形式,然后用有限差分法求解该方程组.所研究的参数为流变常数、浮力比和Lewis数.给出并讨论了典型的速度、温度及浓度曲线.发现屈服应力参数值和非Newton流体的幂律指数对结果有着显著的影响.

关键词：非Newton流体多孔介质屈服应力

Thick Shell with Different masses

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Communications in Theoretical Physics 2011年第10期56卷 687-690页

作者： A.eid m.m.Babatin Department of Physics College of ScienceAl-Imam Muhammed Ibn Saud Islamic UniversityKingdom of Saudi Arabia Department of Astronomy Faculty of ScienceCairo UniversityGizaEgypt Department of mathematics College of ScienceAl-Imam Muhammed Ibn Saud Islamic UniversityKingdom of Saudi Arabia

In the framework of Israel formalism the Oppenheimer-Snyder gravitational collapse and a Schwarzschild cavity are *** motion of the Oppenheimer-Snyder thick shell can be represented by an appropriate thin shell if the... 详细信息

关键词： general relativity shell dynamics cosmology gravitation

FEm for Blood-Based SWCNTs Flow Through a Circular Cylinder in a Porous medium with Electromagnetic radiation

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Communications in Theoretical Physics 2019年第12期71卷 1425-1434页

作者： mohamed r.eid A.F.Al-Hossainy m.Sh.Zoromba Department of mathematics Faculty of ScienceNorthern Border UniversityArar1321Saudi Arabia Department of mathematics Faculty of ScienceNew Valley UniversityAl-KhargaAl-Wadi Al-Gadid72511Egypt Department of Chemistry Faculty of ScienceNew Valley UniversityAl-KhargaAl-Wadi Al-Gadid72511Egypt Department of Chemistry Faculty of ScienceNorthern Border UniversityArar1321Saudi Arabia Department of Chemical and materials Engineering King Abdulaziz UniversityRabigh 21911Saudi Arabia Department of Chemistry Faculty of SciencePort Said University42521 Port-SaidEgypt

This work aims to study magnetohydrodynamic flow through a circular cylinder in a horizontal position of SWCNTs in blood as a base fluid in the existence of non-linear thermal radiation and heat source/*** kinds of nanoparticles shapes are *** study is employed the finite element technique to explore and enhance the influences of essential parameters on temperature profiles and is debated the heat transport within blood injects with SWCNTs and exposes to electromagnetic *** treatment with thermal analysis and heat transfer rate being a better substitute more than surgery and chemotherapy for cancer *** of nanoparticles thermal features is a mounting area of nanomedicine field because of the probable for purposeful demolition of cancer *** remedy is relied on many parameters,including nanofluid thermal conductivity,nanoparticles volume fraction,thermal radiation and power and heat *** numerical solutions for flow and heat transfer features are assessed for diverse governing parameters *** obtained results are substantiated against the relevant numerical results in the published *** show that both flow velocity and temperature increase for larger values of thermal radiation,heat source and SWCNTs volume fraction with lamina and cylinder ***,spherical shape of SWCNTs occurs high disturbances in velocity and temperature distribution in the case of cooled cylinder.

关键词： finite element method heat transfer blood SWCNTs electromagnetic radiation

Boundary-layer non-Newtonian flow over vertical plate in porous medium saturated with nanofluid

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Applied mathematics and mechanics(English Edition) 2011年第12期32卷 1577-1586页

作者： F.m. HADY F. S. IBrAHIm S. m. ABDEL-GAIED m. r. eid Department of mathematics Faculty of Science Assiut University Assiut 71516 Egypt Department of Science and mathematics Faculty of Education Assiut University The New Valley 72111 Egypt

The free convective heat transfer to the power-law non-Newtonian flow from a vertical plate in a porous medium saturated with nanofluid under laminar conditions is investigated. It is considered that the non-Newtonian nanofluid obeys the mathematical model of power-law. The model used for the nanofluid incorporates the effects of Brown- ian motion and thermophoresis. The partial differential system governing the problem is transformed into an ordinary system via a usual similarity transformation. The numer- ical solutions of the resulting ordinary system are obtained. These solutions depend on the power-law index n, Lewis number Le, buoyancy-ratio number Nr, Brownian motion number Nb, and thermophoresis number Nt. For various values of n and Le, the effects of the influence parameters on the fluid behavior as well as the reduced Nusselt number are presented and discussed.

关键词： non-Newtonian free convection nanofluid porous media

metaheuristic Optimization Algorithm for Signals Classification of Electroencephalography Channels

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Computers, materials & Continua 2022年第6期71卷 4627-4641页

作者： marwa m.eid Fawaz Alassery Abdelhameed Ibrahim mohamed Saber Department of Communications and Electronics Delta Higher Institute of Engineering and TechnologyMansoura35111Egypt Department of Computer Engineering College of Computers and Information TechnologyTaif UniversityTaif21944Saudi Arabia Computer Engineering and Control Systems Department Faculty of EngineeringMansoura UniversityMansoura35516Egypt Department of Electronics and Communications Engineering Faculty of EngineeringDelta University for Science and TechnologyMansoura11152Egypt

Digital signal processing of electroencephalography(EEG)data is now widely utilized in various applications,including motor imagery classification,seizure detection and prediction,emotion classification,mental task classification,drug impact identification and sleep state *** the increasing number of recorded EEG channels,it has become clear that effective channel selection algorithms are required for various *** Whale Optimization method(Guided WOA),a suggested feature selection algorithm based on Stochastic Fractal Search(SFS)technique,evaluates the chosen subset of *** may be used to select the optimum EEG channels for use in Brain-Computer Interfaces(BCIs),the method for identifying essential and irrelevant characteristics in a dataset,and the complexity to be *** enables(SFS-Guided WOA)algorithm to choose the most appropriate EEG channels while assisting machine learning classification in its tasks and training the classifier with the ***(SFSGuided WOA)algorithm is superior in performance metrics,and statistical tests such as ANOVA and Wilcoxon rank-sum are used to demonstrate this.

关键词： Signals metaheuristics optimization feature selection multilayer perceptron support vector machines

Influence of chemical reaction on heat and mass transfer of non-Newtonian fluid with yield stress by free convection from vertical surface in porous medium considering Soret effect

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Applied mathematics and mechanics(English Edition) 2010年第6期31卷 675-684页

作者： F. S. IBrAHIm F. m. HADY S. m. ABDEL-GAIED m. r. eid Department of mathematics Faculty of Science Assiut University Department of Science and mathematics Faculty of Education Assiut University

The effect of chemical reaction on free convection heat and mass transfer for a non-Newtonian power law fluid over a vertical flat plate embedded in a fluid-saturated porous medium has been studied in the presence of the yield stress and the Soret effect. The governing boundary layer equations and boundary conditions are cast into a dimen- sionless form by similarity transformations, and the resulting system of equations is solved by a finite difference method. The results are preSented and discussed for concentration profiles, as well as the Nusselt number and the Sherwood number for various values of the parameters, which govern the problem. The results obtained show that the flow field is influenced appreciably by the presence of the chemical reaction parameter γ the order *** chemical reaction parameter m, the Soret number St, the buoyancy ratio N, the Lewis number Le, and the dimensionless rheological parameter Ω.

关键词： non-Newtonian fluid free convection chemical reaction yield stress Soret effect

ON THE COEFFICIENTS OF DIFFErENTIATED EXPANSIONS AND DErIVATIVES OF CHEBYSHEV POLYNOmIALS OF THE THIrD AND FOUrTH KINDS

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Acta mathematica Scientia 2015年第2期35卷 326-338页

作者： eid H.DOHA Waleed m.ABD-ELHAmEED mahmoud A.BASSUONY Department of mathematics Faculty of ScienceCairo University Department of mathematics Faculty of ScienceUniversity of Jeddah Department of mathematics Faculty of ScienceFayoum University

Two new analytical formulae expressing explicitly the derivatives of Chebyshev polynomials of the third and fourth kinds of any degree and of any order in terms of Chebyshev polynomials of the third and fourth kinds themselves are proved. Two other explicit formulae which express the third and fourth kinds Chebyshev expansion coefficients of a general-order derivative of an infinitely differentiable function in terms of their original expansion coefficients are also given. Two new reduction formulae for summing some terminating hypergeometric functions of unit argument are deduced. As an application of how to use Chebyshev polynomials of the third and fourth kinds for solving high-order boundary value problems, two spectral Galerkin numerical solutions of a special linear twelfth-order boundary value problem are given.

关键词： Chebyshev polynomials of the third and fourth kinds expansion coefficients generalized hypergeometric functions boundary value problems

Numerical Algorithm for Solving multi-Pantograph Delay Equations on the Half-line Using Jacobi rational Functions with Convergence Analysis

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Acta mathematicae Applicatae Sinica 2017年第2期33卷 297-310页

作者： eid H. DOHA Ali H. BHrAWY ramy m. HAFEZ Department of mathematics Faculty of Science Cairo University Giza Egypt Department of mathematics Faculty of Science King Abdulaziz University Jeddah Saudi Arabia Department of mathematics Faculty of Science Beni-Suef University Beni-Suef Egypt Department of mathematics Alwagjh University College University of Tabuk Tabuk Saudi Arabia Department of Basic Science Institute of Information Technology Modern Academy Cairo Egypt

A new spectral Jacobi rational-Gauss collocation （JrC） method is proposed for solving the multi- pantograph delay differential equations on the half-line. The method is based on Jacobi rational functions and Gauss quadrature integration formula. The main idea for obtaining a semi-analytical solution for these equations is essentially developed by reducing the pantograph equations with their initial conditions to systems of algebraic equations in the unknown expansion coefficients. The convergence analysis of the method is analyzed. The method possesses the spectral accuracy. Numerical results indicating the high accuracy and effectiveness of this algorithm are presented. Indeed, the present method is compared favorably with other methods.

关键词： multi-pantograph equation delay equation collocation method Jacobi-Gauss quadrature Jacobirational functions convergence analysis

A Proposed Design, Implementation and Control of Doubly Fed Switched reluctance motor

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CES Transactions on Electrical machines and Systems 2019年第1期3卷 101-106页

作者： eid Gouda m.Salah H. the Electrical Engineering Department Faculty of EngineeringMansoura University35516Egypt

In this paper,rotor of switched reluctance motor(Srm)is employed by mounting copper windings on the rotor poles as well as the stator *** and stator windings are excited from DC supply in order to increase the developed electro-magnetic torque;thus enhancing the output power of the drive and keeping the system ***,the proposed Srm offers higher reliability than conventional one,if excitation of rotor windings is lost,the drive will turn into a conventional Srm,the drive will continue running as a conventional *** element method magnetics(FEmm)software is applied to obtain the magnetic characteristics of the proposed Srm.A control strategy for excitation of rotor and stator windings is ***/Simulink modeling of the proposed Srm is given and validated by practical *** results on a prototype show that the proposed Srm is capable of achieving an increased torque compared with conventional Srm drive.

关键词： Doubly Fed Srm Srm Control Wounded rotor.