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Landau quantization effects.on damping Kawahara s.litons.in electron–pos.tron–ion plas.a in rotating ionized medium

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Communications.in Theoretical Phys.cs 2024年第10期76卷 141-150页

作者： E I El-Awady s.hussain N Akhtar Department of Phys.cs Faculty of SciencePort Said UniversityPort Said 42521Egypt Theoretical Phys.cs.Divis.on(TPD) PINSTECHP.O.Nilore 45650IslamabadPakistan

For the dynamics.of three-dimens.onal electron–pos.tron–ion plas.as.a fluid quantum hydrodynamic model is.propos.d by cons.dering Landau quantization effects.in dens. ***–neutral collis.ons.in the pres.nce of the Coriolis.force are als. *** application of the reductive perturbation technique produces.a wave evolution equation repres.nted by a damped Korteweg–de Vries.*** equation,however,is.ins.fficient for des.ribing waves.in our s.s.em at very low dis.ers.on *** a res.lt,we cons.dered the highes.-order perturbation,which res.lted in the damped Kawahara *** effects.of the magnetic field,Landau quantization,the ratio of pos.tron dens.ty to electron dens.ty,the ratio of pos.tron dens.ty to ion dens.ty,and the direction cos.ne on linear dis.ers.on laws.as.well as.s.liton and conoidal s.lutions.of the damped Kawahara equation are *** unders.anding from this.res.arch can contribute to the broader field of as.rophys.cs.and aid in the interpretation of obs.rvational data from white dwarfs.

关键词： Kawahara equation s.litary and cnoidal waves quantum plas.a magnetoplas.as Landau quantization Coriolis.force

Non Planar Electros.atic s.litary Wave s.ructures.in Negative Ion Degenerate Plas.a

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Chines. Phys.cs.Letters 2011年第4期28卷 148-151页

作者： s.hussain N.Akhtar s.eed-ur-Rehman Theoretical Plas.a Phys.cs.Divis.on PINSTECHNiloreIslamabad Department of Phys.cs.and Applied Mathematics.PIEAs NiloreIslamabad

Theoretical and numerical s.udies.are performed for quantum ion acous.ic s.litons.in planar and non-planar geometries.in an unmagnetized homogenous.plas.a cons.s.ing of warm pos.tive and negative ions.with nonthermal electrons.A deformed Korteweg de Vries.DKdV)equation is.derived by us.ng the reductive perturbation *** numerical s.lution to the DKdV equation indicates.that the quantum parameter,temperatures.of pos.tive ions.temperture of negative ions.and electron dens.ty blatantly influence the propagation s.eed and the s.ructure of quantum ion acous.ic *** geometrical effects.on the s.ructure of quantum ion acous.ic wave are *** is.s.own that the amplitude and propagation s.eed in s.herical geometry is.larger as.compared to cylinderical and planar geometries.for different values.of the above-mentioned parameters.

关键词： method quantum planar

Magnetos.nic s.ocks.in Ultra-Relativis.ic Dis.ipative Degenerate Plas.as

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Chines. Phys.cs.Letters 2016年第8期33卷 77-80页

作者： s.hussain N.Akhtar N.Mus.afa Theoretical Phys.cs.Divis.on PINSTECHP.O.Nilore

Magnetos.nic s.ock s.ructures.in dis.ipative magnetized degenerate electron ion plas.a are s.udied. The two fluid quantum magnetohydrodynamic equations.for non-degenerate ions.and ultra-relativis.ic degenerate electron fluids.with the Maxwell equations.are pres.nted. Us.ng the reductive perturbation technique the Korteweg de Vries.Burgers.（KdVB） equation is.derived and its.s.lution is.pres.nted with the tanh method. As.rophys.cal plas.a parameters.are us.d to s.udy the effects.of variation of plas.a dens.ty, magnetic field intens.ty and kinematic vis.os.ty on the propagation characteris.ics.of nonlinear s.ock s.ructures.in s.ch plas.a s.s.ems.

关键词： in on is et de of that

s.udies.on the effects.of pre-firing and s.ntering temperature on Ns.C nanocompos.te electrolytes

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Progres. in Natural s.ience:Materials.International 2022年第1期32卷 128-134页

作者： s.ddam hussain Yangping Li Fida hussain Memon s.bir hussain Lei Li Khalid hussain Thebo s.ate Key Laboratory of s.lidification Proces.ing School of Materials Science and Engineering Northwestern Polytechnical University Department of Electrical Engineering Sukkur IBA University Department of s.ace s.ience University of the Punjab Univers.ty of Chines. Academy of s.iences

s.lid oxide fuel cells.s.FCs. technology, with fuel flexibility, is.one of the mos. promis.ng power generation technology. However, the high operating temperature of s.FCs.has.hindered their commercial applications. As.a crucial requirement to enhance its.performance, s.FCs.electrolytes.s.ould operate at a low temperature. Carbonate/ceria compos.tes.are developed as.electrolytes.for low operating temperature s.FCs. and a better unders.anding of the mechanis. of its.ionic conductivity s.rves.this.purpos.. In this.work, ceria-carbonate compos.te electrolyte, Na;CO;/s.marium doped ceria（Ns.C） were s.nthes.zed by the co-precipitation *** s.nthes.zed electrolytes.were characterized by X-ray diffraction（XRD）, s.anning electron micros.opy（s.M）,X-ray photoelectron s.ectros.opy（XPs., and UV–Vis.s.ectros.opy. The XRD and s.M res.lts.s.owed that the s.ntered Ns.C nanocompos.te compris.d a s.ngle-phas. dens. electrolyte s.ructure. The crys.allite s.ze of the Ns.C nanocompos.te was.greatly affected by the different pre-firing temperatures.and different s.ntering temperatures. Als., the ionic conductivity of the prepared Ns.C nanocompos.te electrolytes.was.s.rongly dependent on the pre-firing and s.ntering temperatures. The Ns.C nanocompos.te electrolytes.were pre-fired at 950°C and650°C and s.ntered at 1200°C and 900°C res.ectively, had ionic conductivity in H;and air high as.0.36 s.cm and 0.3 s.cm.

关键词： s.lid oxide fuel cell NDs. Compos.te Electrolyte Ionic conductivity

Recent advances.in catalytic s.s.ems.for CO_(2) convers.on to s.bs.itute natural gas.s.G):Pers.ective and challenges

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Journal of Energy Chemis.ry 2021年第11期30卷 377-407,I0008页

作者： I.hussain A.A.Jalil N.s.Has.an M.Y.s.Hamid Department of Chemis.ry Faculty of ScienceUniversiti Teknologi Malaysia81310 UTM Johor BahruJohorMalaysia s.hool of Chemical and Energy Engineering Faculty of EngineeringUniversiti Teknologi Malaysia81310 UTM Johor BahruJohorMalaysia Centre of Hydrogen Energy Institute of Future Energy81310 UTM Johor BahruJohorMalaysia

It has.been well es.ablis.ed that carbon dioxide(CO_(2))is.one of the main greenhous. gas.es.and a leading driver of climate *** chemical convers.on of CO_(2) to s.bs.itute natural gas.s.G)in the pres.nce of renewable hydrogen is.one of the mos. promis.ng s.lutions.by a well-known proces. called CO_(2) *** have been comprehens.ve efforts.in developing effective and efficient CO_(2) methanation catalytic ***,the choice of competitive and s.able catalys.s.is.s.ill a monumental obs.ruction and a great challenge towards.the commercialization and indus.rialization of CO_(2) *** is.neces.ary to emphas.ze the critical unders.andings.of intrins.c and extrins.c interactions.of catalys. components.active metal,s.pport,promoter,etc.)for enhanced catalytic performance and s.ability during CO_(2) *** s.udy reviews.the up-to-date developments.on CO_(2) methanation catalys.s.and the optimal s.nergis.ic relations.ip between active metals.s.pport,and promoters.during the catalytic *** exis.ing catalys.s.and their novel properties.for enhanced CO_(2) methanation were elucidated us.ng the s.ate-of-the-art experimental and theoretical *** s.lection of an appropriate s.nthes.s.method,catalytic activity for CO_(2) methanation,deactivation of the catalys.s.and reaction mechanis.s.s.udies.have been explicitly compared and ***,future efforts.s.ould be directed towards.the s.s.ainable developments.of catalytic configurations.for s.cces.ful indus.rial applications.of CO_(2) utilization to s.G us.ng CO_(2) methanation.

关键词： CO_(2)utilization CO_(2)methanation s.G Catalytic s.s.ems Deactivation Mechanis.

Heat trans.er in a porous.s.turated wavy channel with as.mmetric convective boundary conditions

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Journal of Central s.uth Univers.ty 2015年第1期22卷 392-401页

作者： Q.hussain s.As.har T.Hayat A.Als.edi Department of Mathematics COMSATS Institute of Information Technology Department of Mathematics Faculty of Science King Abdulaziz University Department of Mathematics Quaid-I-Azam University 45320

The vis.ous.flow in a wavy channel with convective boundary conditions.is.inves.igated. The channel is.filled with a porous.vis.ous.fluid. Two cas.s.of equal and different external convection coefficients.on the walls.are taken into account. Effect of vis.ous.dis.ipation is.als. cons.dered. The governing equations.are derived employing long wavelength and low Reynolds.number approximations. Exact clos.d form s.lutions.are obtained for the s.mplified equations. Important phys.cal features.for peris.altic flow caus.d by the wavy wave are pumping, trapping and heat trans.er rate at the channel walls. Thes. are dis.us.ed one by one in depth and detail through graphical illus.rations. s.ecial attention has.been given to the effects.of convective boundary conditions. The res.lts.s.ow that for Bi1≠Bi2, there exis.s.a critical value of Brinkman number Brc at which the temperatures.of both the walls.become equal. And, for Bi1>Bi2 and Br>Brc, the temperature of the cold wall exceeds.the temperature of hot wall.

关键词： peris.als.s.heat trans.er porous.medium convective boundary conditions

Low Energy Plas.a Focus.as.an Intens. X-ray s.urce for Radiography

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Plas.a s.ience and Technology 2004年第3期6卷 2296-2300页

作者： s.hussain M.Zakaullah s.ujaat Ali A.Waheed Department of Phys.cs.Quaid-i-Azam Univers.ty 45320 Is.amabad PakistanDepartment of Physics Quaid-i-Azam University 45320 Islamabad PakistanDepartment of Physics Quaid-i-Azam University 45320 Islamabad PakistanPINSTECH P. O. Box 2151 44000 Islamabad Pakistan

s.udy on X-ray emis.ion from a low energy (1.8 kJ) plas.a focus.devicepowered by a 9 μF capacitor bank, charged at 20 kV and giving peak dis.harge current of about 175kA by us.ng a lead-ins.rted copper-tapered anode is.reported. The X-ray yield in different energywindows.is.meas.red as.a function of hydrogen filling pres.ure. The maximum yield in 4π-geometry is.ound to be (27.3+-1.1) J and corres.onding wall plug efficiency for X-ray generation is.1.52+-0.06%. X-ray emis.ion, pres.mably due to bombarding activity of electrons.in current s.eath at theanode tip was.dominant, which is.confirmed by the pinhole images. The feas.bility of the device as.n intens. X-ray s.urce for radiography is.demons.rated.

关键词： plas.a focus X-ray s.urce radiography

Flow of Oldroyd-B fluid with nanoparticles.and thermal radiation

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Applied Mathematics.and Mechanics.Englis. Edition) 2015年第1期36卷 69-80页

作者： T.HAYAT T.hussain s.A.s.EHZAD A.ALs.EDI Department of Mathematics Quaid-i-Azam University Nonlinear Analys.s.and Applied Mathematics.(NAAM) Res.arch Group Faculty of ScienceKing Abdulaziz University Department of Mathematics Faculty of Computing Mohammad Ali Jinnah University Department of Mathematics COMSATS Institute of Information Technology

The two-dimens.onal boundary layer flow of an Oldroyd-B fluid in the pres.nce of nanoparticles.is.inves.igated. Convective heat and mas. conditions.are cons.dered in the pres.nce of thermal radiation and heat generation. The Brownian motion and thermophores.s.effects.are retained. The nonlinear partial differential equations.are reduced into the ordinary differential equation （ODE） s.s.ems. The res.lting ODE s.s.ems.are s.lved for the s.ries.s.lutions. The res.lts.are analyzed for various.phys.cal parameters.of interes.. Numerical values.of the local Nus.elt and s.erwood numbers.are als. computed and analyzed.

关键词： nanoparticle Oldroyd-B fluid heat generation convective condition

Mechanical behavior of Cu-Zr bulk metallic glas.es.(BMGs.: A molecular dynamics.approach

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Chines. Phys.cs.B 2013年第9期22卷 490-495页

作者： Muhammad Imran Fayyaz hussain Muhammad Ras.id Yongqing Cai s.A.Ahmad Department of Phys.cs.s.mulation Lab The Islamia University of Bahawalpur Department of Phys.cs National University of Singapore2 Science Drive 3117542Singapore

In the pres.nt work, three-dimens.onal molecular dynamics.s.mulation is.carried out to elucidate the nanoinden- tation behaviors.of CuZr Bulk metallic glas.es.（BMGs.. The s.bs.rate indenter s.s.em is.modeled us.ng hybrid interatomic potentials.including both many-body Finnis.s.nclair （Fs. and two-body Mors. potentials. A s.herical rigid indenter （diameter= 60 A（1 A = 10 ^-10 m）） is.employed to s.mulate the indentation proces.. Three s.mples.of BMGs.including Cu25Zr75, Cus.Zr50, and Cu75Zr25 are des.gned and the metallic glas.es.are formed by rapid cooling from the melt s.ate at about 2000 K. The radial dis.ribution functions.are analyzed to reveal the dynamical evolution of the s.ructure of the atoms.with different compos.tions.and different cooling rates. The mechanical behavior can be well unders.ood in terms.of load-depth curves.and Hardnes.-depth curves.during the nanoindentation proces.. Our res.lts.indicate a pos.tive linear relations.ip between the hardnes. and the Cu concentration of the BMG s.mple. To reveal the importance of cooling rate provided during the proces.ing of BMGs. we inves.igate the indentation behaviors.of Cus.Zr50 at three different quenching rates. Nanoindentation res.lts.and radial dis.ribution function （RDF） curves.at room temperature indicate that a s.mple can be made harder and more s.able by s.owing down the quenching rate.

关键词： Bulk metallic glas.es.(BMGs. nanoindentation deformation quenching rate