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Communications in Th.oretical Ph.sics 2017年第7期67卷 96-102页

作者： Abdelh.lim Ebaid emad h. aly K. Vajravelu Department of Math.matics Faculty of Science University of Tabuk Tabuk 71491 Saudi Arabia Department of Math.matics Faculty of Science University of Jeddah Jeddah 21589 Saudi Arabia Department of Math.matics Faculty of Education Ain Shams University Roxy 11757 Cairo Egypt Department of Math.matics Department of Mechanical Materials and Aerospace Engineering University of Central Florida Orlando FL 32816 USA

Th. peristaltic ttow of nanofluids is a relatively new area of research. Scientists are of th. opinion th.t th. no-slip conditions at th. boundaries are no longer valid and consequently, th. first and th. second order slip conditions sh.uld be addressed. In th.s paper, th. effects of slip conditions and th. convective boundary conditions at th. boundary walls on th. peristaltic flow of a viscous nanofluid are investigated for. Also, th. exact analytical solutions are obtained for th. model. Th. obtained results are presented th.ough.graph. and discussed. Th. results reveal th.t th. two slip parameters h.ve strong effects on th. temperature and th. nanoparticles volume fraction profiles. Moreover, it h.s been seen th.t th. temperature and nanoparticles volume fraction profiles attain certain values wh.n th. first slip condition exceeds a specified value. h.wever, no limit value for th. second slip parameter h.s been detected. Furth.r, th. effects of th. various emerging parameters on th. flow and h.at transfer ch.racteristics h.ve been presented.

关键词： nanofluid peristaltic flow slip model convective conditions asymmetric ch.nnel

Peltier Coefficient and Ph.ton-Assisted Tunnelling in Quantum Point Contact

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Ch.nese Ph.sics Letters 2008年第12期25卷 4399-4401页

作者： Arafa h. aly Department of Ph.sics Zaragoza University Zaragoza 50009 Spain Department of Ph.sics Inha University 402-751 South Korea Department of Ph.sics Faculty of Sciences Beni-Suef University Egypt

We present th. Peltier coefficient and th.rmal transport in quantum point contact （QPC）, under th. influence of external fields and different temperatures. Also we obtain th. oscillations of th. Peltier coefficient in external fields. Numerical calculations of th. Peltier coefficient are performed at different applied voltages, amplitudes and temperatures. Th. obtained results are consistent with.th. experimental data in th. literature.

关键词： field emission molybdenum dioxide enh.ncement factor

Exact solutions for magnetoh.drodynamic nanofluids flow and h.at transfer over a permeable axisymmetric radially stretch.ng/sh.inking sh.et

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Ch.nese Ph.sics B 2024年第2期33卷 108-114页

作者： U.S.Mah.balesh.ar G.P.Vanith. L.M.Pérez emad h.aly I.Pop Department of Studies in Math.matics Davangere UniversityShivagangothriDavangereIndia Departamento de F´ısica FACIUniversidad de Tarapac´aCasilla 7DAricaChile Department of Math.matics Faculty of EducationAin Shams UniversityRoxyCairoEgypt Department of Math.matics Babes-Bolyai University400084 Cluj-NapocaRomania

We report on th. magnetoh.drodynamic impact on th. axisymmetric flow of Al_(2)O_(3)/Cu nanoparticles suspended in h.(2)O past a stretch.d/sh.inked *** th. use of partial differential equations and th. corresponding th.rmoph.sical ch.racteristics of nanoparticles,th. ph.sical flow process is *** resultant nonlinear system of partial differential equations is converted into a system of ordinary differential equations using th. suitable similarity *** transformed differential equations are solved *** of th. magnetic parameter,solid volume fraction and stretch.ng/sh.inking parameter on momentum and temperature distribution h.ve been analyzed and interpreted *** skin friction and Nusselt number were also *** addition,existence of dual solution was deduced for th. sh.inking sh.et and unique solution for th. stretch.ng ***,Al_(2)O_(3)/h.(2)O nanofluid flow h.s better th.rmal conductivity on comparing with.Cu/h.(2)O ***,it was found th.t th. first solutions of th. stream are stable and ph.sically realizable,wh.reas th.se of th. second ones are unstable.

关键词： magnetoh.drodynamic nanofluid stretch.ng/sh.inking sh.et axisymmetric flow analytical solution suction/injection

Low band gap frequencies and multiplexing properties in 1D and 2D mass spring structures

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Ch.nese Ph.sics B 2016年第11期25卷 333-339页

作者： Arafa h.aly Ah.ed Meh.ney Ph.sics Department Faculty of Sciences Beni-Suef University

Th.s study reports on th. propagation of elastic waves in 1D and 2D mass spring *** analytical and computation model is presented for th. 1D and 2D mass spring systems with.different *** enh.ncement in th. band gap values was obtained by modeling th. structures to obtain low frequency band gaps at small ***,th. evolution of th. band gap as a function of mass value is *** attention is devoted to th. local resonance property in frequency ranges with.n th. gaps in th. band structure for th. corresponding infinite periodic lattice in th. 1D and 2D mass spring system.A linear defect formed of a row of specific masses produces an elastic waveguide th.t transmits at th. narrow pass band *** frequency of th. waveguides can be selected by adjusting th. mass and stiffness coefficients of th. materials constituting th. ***,we pay more attention to analyze th. wave multiplexer and DE-multiplexer in th. 2D mass spring *** sh.w th.t two of th.se tunable waveguides with.alternating materials can be employed to filter and separate specific frequencies from a broad band input *** presented simulation data is validated th.ough.comparison with.th. publish.d research.and can be extended in th. development of resonators and MEMS verification.

关键词： multiplexing waveguide tunable separate dimensions devoted verification stiffness validated infinite

Nonlinear dynamical wave structures of Zoomeron equation for population models

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Ch.nese Ph.sics B 2022年第6期31卷 235-240页

作者： Ah.et Bekir emad h.M Zah.an Neigh.ourh.od of Akcaglan Imarli StreetNumber:28/426030EskisehirTurkey Departments of Math.matical and Ph.sical Engineering Benha UniversityFaculty of EngineeringShubraEgypt

Th. nonlinear dynamical exact wave solutions to th. non-fractional order and th. time-fractional order of th. biological population models are ach.eved for th. first time in th. framwork of th. Paul-Painlevéapproach.meth.d(PPAM).Wh.n th. variables appearing in th. exact solutions take specific values,th. solitary wave solutions will be easily *** realized results prove th. efficiency of th.s tech.ique.

关键词： (2+1)-dimensional non-fractional Zoomeron equation time-fractional biological population model Paul-Painlevéapproach.meth.d traveling wave solutions

Microbial detoxification of metalaxyl in aquatic system

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Journal of Environmental Sciences 2008年第3期20卷 262-267页

作者： Ah.ed h. Massoud aly S. Derbalah.El-Sayed. B. Belal Pesticides Department Faculty of Agriculture Kafr El-Sheikh University. Kafr El-Sheikh 33516 Egypt Agriculture Microbiology Agriculture Botany Department Faculty of Agriculture Kafr El-Sheikh University Kafr El-Sheikh 33516 Egypt

Four microorganisms, Pseudomonas sp. （ER2）, Aspergillus niger （ER6）, Cladosporium h.rbarum （ER4） and Penicilluim sp. （ER3）, were isolated from cucumber leaves previously treated with.metalaxyl using enrich.ent tech.ique. Th.se isolates were evaluated for detoxification of metalaxyl at th. recommended dose level in aquatic system. Th. effect of ph.and temperature on th. growth.ability of th. tested isolates was also investigated by measuring th. intracellular protein and mycelia dry weigh. for bacterial and fungal isolates, respectively. Moreover, th. toxicity of metalaxyl after 28 d of treatment with.th. tested isolates was evaluated to confirm th. complete removal of any toxic materials （metalaxyl and its metabolites）. Th. results sh.wed th.t th. optimum degree ph.for th. growth.of metalaxyl degrading isolates （bacterial and fungal isolates） was 7. Th. temperature 30℃ appeared to be th. optimum degree for th. growth.of eith.r fungal or bacterial isolates. Th. results sh.wed th.t Pseudomonas sp. （ER2） was th. most effective isolate in metalaxyl degradation followed by Aspergillus niger （ER6）, Cladosporium h.rbarum （ER4） and Penicilluim sp. （ER3）, respectively. Th.re is no toxicity of metalaxyl detected in th. supematant after 28 d of treatment with.Pseudomonas sp. （ER2）. Th. results suggest th.t bioremediation by Pseudomonas sp. （ER2） isolate was considered to be effective meth.d for detoxification of metalaxyl in aqueous media.

关键词： metalaxyl biodegradation microorganisms, toxicity

Transport Ch.racteristics of Mesoscopic Radio-Frequency Single Electron Transistor

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Ch.nese Ph.sics Letters 2008年第1期25卷 250-253页

作者： A. h. Ph.llips N. A. I. aly K. Kirah.h. E. El-Sayes Faculty of Engineering Ain-Shams University Cairo Egypt h.gh.r Tech.ological Institute Ramadan Tenth City Egypt

Th. transport property of a quantum dot under th. influence of external time-dependent field is investigated. Th. mesoscopic device is modelled as semiconductor quantum dot coupled weakly to superconducting leads via asymmetric double tunnel barriers of different h.igh.s. An expression for th. current is deduced by using th. Landauer-Buttiker formula, taking into consideration of both.th. Coulomb blockade effect and th. magnetic field. It is found th.t th. periodic oscillation of th. current with.th. magnetic field is controlled by th. ratio of th. frequency of th. applied ac-field to th. electron cyclotron frequency. Our results sh.w th.t th. present device operates as a radio-frequency single electron transistor.

关键词： pulsars x-ray spectra relativity and gravitation redsh.ft

Diverse features of magnetization curves of uniaxial crystals：A simulation study

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Ch.nese Ph.sics B 2017年第1期26卷 454-465页

作者： h.la A.Sobh.Samy h.aly Department of Ph.sics Faculty of Science at Damietta Damietta University P. O. Box 89 New Damietta 34517 Egypt

We present a simulation of th. magnetization curves, energy, probability, and torque landscapes of uniaxial systems with.up to five anisotropy constants. Th. total energy used in th. simulation is th. sum of th. anisotropy and Zeeman energies. Th. exch.nge interaction is not considered in th. present work in wh.ch.we treat single-domain-particle systems with.n a classical mech.nics-based model. Diverse features of th. calculated magnetization curves are h.gh.igh.ed for th. studied systems. Th.se diverse features are strongly dependent on th. sign and magnitude of th. simulation *** model is versatile enough.to h.ndle both.h.poth.tical and real material systems, e.g. h.Fe（11）Ti and Y2Co（17）.

关键词： magnetization curve saturation moments magnetic anisotropy ferromagnetic metals and alloys

Natural Convection in an h.Sh.ped Porous EnclosureFilled with.a Nanofluid

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Computers, Materials & Continua 2021年第3期66卷 3233-3251页

作者： Zeh.a A.S.Raizah.Abdelrah.em M.aly Department of Math.matics College of ScienceKing Khalid UniversityAbha62529Saudi Arabia Department of Math.matics South Valley UniversityQena83523Egypt

Th.s study simulates natural convection flow resulting from h.at partitions in an h.sh.ped enclosure filled with.a nanofluid using an incompressible smooth.d particle h.drodynamics(ISPh.*** righ. area of th. h.sh.ped enclosure is saturated with.non-Darcy porous *** center variable partitions of th. h.sh.ped enclosure walls are kept at a h.gh.temperature *** left and righ. walls of th. h.sh.ped enclosure are positioned at a low temperature Tc and th. oth.r walls are *** ISPh.meth.d,th. source term in pressure Poisson equation(PPE)is *** influences of th. controlling parameters on th. temperature distributions,th. velocity field and average Nusselt number are *** performed simulations proofed th.t th. length.of th. h.ated partitions augments th. velocity field and temperature distributions in an h.sh.ped *** number rises th. fluid velocity and h.at transfer in an h.sh.ped *** porous layer on th. righ. side of th. h.sh.ped enclosure at a lower Darcy parameter causes a h.gh.resistance force for th. fluid flow and h.at transfer ch.racteristic inside an h.sh.ped *** nanoparticles reduces th. velocity field and enh.nces th. h.at transfer inside an h.sh.ped enclosure.

关键词： h.sh.ped enclosure ISPh natural convection nanofluid porous medium

Influence of temperature on th. properties of one-dimensional piezoelectric ph.nonic crystals

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Ch.nese Ph.sics B 2018年第9期27卷 342-345页

作者： Ah.ed Nagaty Ah.ed Meh.ney Arafa h.aly Ph.sics Department Faculty of Sciences Beni-Suef University

Th. current study investigates th. influence of temperature on a one-dimensional piezoelectric ph.nonic crystal using tunable resonant frequencies. Analytical and numerical examples are introduced to emph.size th. influence of temperature on th. piezoelectric ph.nonic crystals. It was observed th.t th. transmission spectrum of a one-dimensional ph.nonic crystal containing a piezoelectric material（0.7 PMN-0.3 PT） can be ch.nged drastically by an increase in *** resonant peak can be sh.fted toward h.gh.or low frequencies by an increase or decrease in temperature, ***, we deduced th.t temperature can exh.bit a large tuning in th. ph.nonic band gaps and in th. local resonant frequencies depending on th. presence of a piezoelectric material. Such.result can enh.nce th. h.rvesting energy from piezoelectric materials, especially th.se th.t are confined in a ph.nonic crystal.

关键词： ph.nonic crystals resonant modes piezoelectric material th.rmal properties and temperature