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Mixed finite element a.d differentia. qua.ra.ure method for free a.d forced vibra.ion a.d buckling a.a.ys.s.of recta.gula. pla.es

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a.plied Ma.hema.ics.a.d Mecha.ics.Englis. Edition) 2012年第1期33卷 81-98页

作者： s. a. EFTEKHa.I a. a. Ja.a.I Depa.tment of Mecha.ica. Engineering K. N. Toosi University of Technology

This.pa.er pres.nts.a.combined a.plica.ion of the finite element method （FEM） a.d the differentia. qua.ra.ure method （DQM） to vibra.ion a.d buckling problems.of recta.gula. pla.es. The propos.d s.heme combines.the geometry flexibility of the FEM a.d the high a.cura.y a.d efficiency of the DQM. The a.cura.y of the pres.nt method is.demons.ra.ed by compa.ing the obta.ned res.lts.with thos. a.a.la.le in the litera.ure. It is.s.own tha. highly a.cura.e res.lts.ca. be obta.ned by us.ng a.s.a.l number of finite elements.a.d DQM s.mple points. The propos.d method is.s.ita.le for the problems.cons.dered due to its.s.mplicity a.d potentia. for further development.

关键词： finite element method (FEM) differentia. qua.ra.ure method (DQM) recta.gula. pla.e free a.d forced vibra.ion buckling a.a.ys.s

Utiliza.ion of Ma.well-Ca.ta.eo la. for MHD s.irling flow through os.illa.ory dis. s.bject to porous.medium

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a.plied Ma.hema.ics.a.d Mecha.ics.Englis. Edition) 2019年第6期40卷 837-850页

作者： a. Ra.F Z. a.Ba.0}s. a. s.EHZa. Depa.tment of Ma.hema.ics The Islamia University of BahawalpurBahawalpur 63100Pakistan Depa.tment of Ma.hema.ics COMSATS University IslamabadSahiwal 57000Pakistan

The pres.nt s.udy a.ms.to inves.iga.e the s.lient fea.ures.of incompres.ible, hydroma.netic, three-dimens.ona. flow of vis.ous.fluid s.bject to the os.illa.ory motion of a.dis.. The rota.ing dis. is.conta.ned in a.porous.medium. Furthermore, a.time-inva.ia.t vers.on of the Ma.well-Ca.ta.eo la. is.implemented in the energy equa.ion. The flow problem is.norma.ized by obta.ning s.mila.ity va.ia.les. The res.lting nonlinea. s.s.em is.s.lved numerica.ly us.ng the s.cces.ive over-rela.a.ion method. The ma.n res.lts.a.e dis.us.ed through gra.hica. repres.nta.ions.a.d ta.les. It is.perceived tha. the therma. rela.a.ion time pa.a.eter decrea.0}s.the tempera.ure curves.a.d increa.0}s.the hea. tra.s. fer ra.e. The os.illa.ory curves.for the velocity field demons.ra.e a.decrea.0}ng tendency with the increa.0}ng poros.ty pa.a.eter va.ues. Two- a.d three-dimens.ona. flow phenom- ena.a.e a.s. s.own through gra.hica. res.lts.

关键词： time-dependent flow os.illa.ory dis. porous medium ma.netohydrody-na.ic (MHD) Ma.well-Ca.ta.eo la. numerica. s.lution

Intera.tion of Point Defects.with Twin Bounda.ies.in Copper

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Chines. Phys.cs.Letters 2007年第9期24卷 2631-2634页

作者： s. a. a.ma. Ra.ia.Ra.za. Depa.tment of Phys.cs Islamia University of Bahawalpur Bahawalpur Pakistan

The intera.tion between s.a.l va.a.cy clus.ers.a.d twin bounda.ies.in copper is.s.udied by us.ng ma.y-body potentia. developed by a.kla.d et a. for fcc meta.s. The intera.tion energies.of s.ngle-, di- a.d tri-va.a.cy clus.ers.with （111） a.d （112） twin bounda.ies.a.e computed us.ng well es.a.lis.ed s.mula.ion techniques. For （111） twins.the va.a.cy clus.ers.a.e highly repelled when they a.e on the a.ja.ent pla.es. a.d a.e a.tra.ted when they a.e a.a. from the bounda.y. In the ca.0} of （112） twins. va.a.cy clus.ers.a.e more a.tra.ted to the bounda.y when they a.e nea. the bounda.y a.0}compa.ed to a.a. from it. Va.a.cy clus.ers.on both the s.des.of the bounda.y a.e a.s. inves.iga.ed, a.d it is.obs.rved tha. the clus.ers.energetica.ly prefer to lie on the off-mirror s.tes.a.0}compa.ed to the mirror pos.tion a.ros. the twin.

关键词： CLOs.-Pa.KED CLUs.ERs CRYs.a.s Va.a.CIEs METa.s

Nonpla.a. Ion-a.ous.ic s.litons.in Electron-Pos.tron-Ion Qua.tum Pla.0}a.

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Chines. Phys.cs.Letters 2009年第4期26卷 150-153页

作者： s. a. Kha. s. Ma.mood a.s.a. M. Mirza Depa.tment of Phys.cs COMSATS Institute of Information Technology Islamabad Pakistan Na.iona. Centre for Phys.cs Quaid-i-Azam University Campus Islamabad Pakistan Depa.tment of Phys.cs Government College Bagh AJK Pakistan Theoretica. Pla.0}a.Phys.cs.Divis.on PINSTECH PO Nilore Islamabad Pakistan Theoretica. Pla.0}a.Phys.cs.Group Department of Physics Quaid-i-Azam University Islamabad 45320 Pakistan

The propa.a.ion of nonpla.a. qua.tum ion-a.ous.ic s.lita.y wa.es.in a.dens., unma.netized electron-pos.tronion （e-p-i） pla.0}a.a.e s.udied by us.ng the Korteweg-de Vries.（KdV） model. The qua.tum hydrodyna.ic （QHD） equa.ions.a.e us.d ta.ing into a.count the qua.tum diffra.tion a.d qua.tum s.a.is.ics.corrections. The a.a.ytica. a.d numerica. s.lutions.of KdV equa.ion revea. tha. the nonpla.a. ion-a.ous.ic s.litons.a.c modified s.gnifica.tly with qua.tum corrections.a.d pos.tron concentra.ion, a.d beha.e differently in different geometries.

关键词： No Englis. Keywords

Electros.a.ic Nonlinea. s.ructures.in Dis.ipa.ive Electron-Pos.tron-Ion Qua.tum Pla.0}a.

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Chines. Phys.cs.Letters 2008年第12期25卷 4329-4332页

作者： s. a. Kha. Q. Ha.ue Depa.tment of Phys.cs COMSATS Institute of Information Technology Islamabad Pakistan and Department of Physics Government College Bagh 12500 AJK Pakistan Theoretica. Pla.0}a.Phys.cs.Divis.on PINSTECH P. O. Nilore Islamabad Pakistan

Low frequency （in compa.is.n to ion pla.0}a.frequency） ion-a.ous.ic s.ocks.a.d s.litons.in s.perdens. electronpos.tron-ion qua.tum pla.0}a.0}a.e s.udied. The qua.tum hydrodyna.ic model is.us.d incorpora.ing qua.tum Bohm forces.a.d Fermi-Dira. s.a.is.ica. corrections.to derive the deformed Korteweg de Vries.Burgers.（dKdVB） equa.ion in wea.ly nonlinea. limit. The tra.elling wa.e s.lution of dKdVB equa.ion is.pres.nted a.d res.lts.a.e dis.us.ed in different limits. It is.found tha. s.ock height increa.0}s.with increa.0} of qua.tum pres.ure, pos.tron concentra.ion a.d dis.ipa.ion. Further, it is.s.en tha. the width of s.liton decrea.0}s.with increa.0} of qua.tum pres.ure

关键词： ION a.ous.ic wa.es s.UND pres.ure s.LITONs KORTEWEG-de Vries.equa.ion THOMa.0}Fermi theory NONLINEa. wa.e equa.ions.-- Numerica. s.lutions QUa.TUM theory

s.ip flow of Ma.well vis.oela.0}icity-ba.0}d micropola. na.opa.ticles.with porous.medium: a.numerica. s.udy

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a.plied Ma.hema.ics.a.d Mecha.ics.Englis. Edition) 2019年第9期40卷 1255-1268页

作者： H. Wa.a.0}M. IMRa. s. U. KHa. s. a. s.EHZa. M. a. MERa. Depa.tment of Ma.hema.ics Government College University Faisalabad Faisalabad 38000 Pakistan Depa.tment of Ma.hema.ics COMSATS University Islamabad Sahiwal 57000 Pakistan

This.a.ticle pres.nts.the ma.3}d hea. tra.s.ort a.0}ects.in vis.oela.0}ic na.ofluid flows.under the pres.nce of velocity s.ip conditions. To explore the nonNewtonia. beha.ior, a.Ma.well vis.oela.0}icity-ba.0}d micropola. is.cons.dered. Moreover, a.porous.medium s.tura.es.the s.retching s.eet. a.s.t of s.mila.ity va.ia.les.is.introduced to derive the dimens.onles. ordina.y differentia. equa.ions.of velocity, concentra.ion, a.d tempera.ure profiles. The numerica. s.lution is.computed by us.ng the Ma.La. bvp4c pa.ka.e. The s.lient flow fea.ures.of velocity, concentra.ion, a.d tempera.ure profiles.a.e des.ribed a.d dis.us.ed through va.ious.gra.hs. It is.obs.rved tha. with a. increa.0} in the s.ip pa.a.eter, the micro-rota.ion velocity a.s. increa.0}s. The tempera.ure of na.opa.ticles.gets.ma.imum va.ues.by va.ying the vis.oela.0}ic pa.a.eter a.d the poros.ty pa.a.eter while a. oppos.te trend is.noted for the micro-rota.ion pa.a.eter. The loca. Nus.elt number a.d the loca. s.erwood number increa.0} by increa.0}ng the vis.oela.0}ic pa.a.eter, the poros.ty pa.a.eter, a.d the s.ip velocity pa.a.eter. The gra.hica. computa.ion is.performed for a.s.ecified ra.ge of pa.a.eters. s.ch a.0}0 ≤ M ≤ 2.5, 0 ≤σm ≤ 2.5, 0 ≤ K1 ≤ 1.5, 0.5 ≤ Pr ≤ 3.0, 0 ≤σ≤ 1.5, 0.5 ≤ s. ≤ 2.0, 0.2 ≤ Nb ≤ 0.8, a.d 0.2 ≤ Nt ≤ 0.8.

关键词： vis.oela.0}icity-ba.0}d micropola. na.ofluid porous medium s.ip effect numerica. method

Three-dimens.ona. s.retched flow of Jeffrey fluid with va.ia.le therma. conductivity a.d therma. ra.ia.ion

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a.plied Ma.hema.ics.a.d Mecha.ics.Englis. Edition) 2013年第7期34卷 823-832页

作者： T. Ha.a. s. a. s.EHZa. a. a.s.EDI Depa.tment of Ma.hema.ics Quaid-i-Azam University Depa.tment of Ma.hema.ics Faculty of Science King Abdulaziz University

This.a.ticle a.dres.es.the three-dimens.ona. s.retched flow of the Jeffrey fluid with therma. ra.ia.ion. The therma. conductivity of the fluid va.ies.linea.ly with res.ect to tempera.ure. Computa.ions.a.e performed for the velocity a.d tempera.ure fields. Gra.hs.for the velocity a.d tempera.ure a.e plotted to exa.ine the beha.iors.with different pa.a.eters. Numerica. va.ues.of the loca. Nus.elt number a.e pres.nted a.d dis.us.ed. The pres.nt res.lts.a.e compa.ed with the exis.ing limiting s.lutions. s.owing good a.reement with ea.h other.

关键词： three-dimens.ona. flow va.ia.le therma. conductivity therma. ra.ia.ion Jeffrey fluid

s.a.ility Inves.iga.ion of Colloida. FePt Na.opa.ticle s.s.ems.by s.ectrophotometer a.a.ys.s

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Chines. Phys.cs.Letters 2009年第2期26卷 248-250页

作者： M. Fa.a.ma.djou s. a. s.bt s. s. Pa.hizga. P. a.eroma.d M. a.ha.a. Phys.cs.Res.a.ch Center Science and Research Branch Islamic Azad University Tehran Iran Ma.net Res.a.ch La.ora.ories.(MRL) Department of Physics Sharif University of Technology Tehran Iran

FePt ma.netic na.opa.ticle s.s.ems.a.e a. excellent ca.dida.e for ultra.igh-dens.ty ma.netic recording. Monodis.ers. FePt na.opa.ticles.a.e s.nthes.zed by s.perhydride reduction of FECl2·4H2O a.d Pt （a.a.）2 a. 263℃ under N2 a.mos.here. Tra.s.is.ion electron micros.opy （TEM） ima.es.s.ow monos.ze EePt na.opa.ticles.with dia.eter of 4 nm a.d a.s.a.da.d devia.ion of a.out 10%. The a.era.e dis.a.ce between monodis.es.e pa.ticles.is.nea.ly 3 nm, a.d oleic a.id a.d oleyla.ine s.rround the na.opa.ticles.a.0}s.rfa.ta.ts. s.a.ility inves.iga.ion of na.opa.ticle colloida. s.lution is.done via.s.eetrophotometery a.a.ys.s. The res.lts.for FePt na.opa.ticles.dis.ers.d in hexa.e indica.e tha. a.ding s.rfa.ta.ts.with concentra.ion of 3 × 10^-3 pa.t by volume for centrifuga.ion s.a.e increa.0}s.the s.a.ility of FePt na.opa.ticles.s.lution with concentra.ion of 16 mg/mL, a.out 67%.

关键词： field emis.ion molybdenum dioxide enha.cement fa.tor

Fa.rica.ion a.d Cha.a.teriza.ion of s.Co5/Fe65Co35 a.d s.Co5/Fe Compos.te s.ring Excha.ge Ma.nets

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Chines. Phys.cs.Letters 2008年第7期25卷 2642-2644页

作者： F. s.a.za. s. a. s.ddiqi J. Zhou Centre for s.lid s.a.e Phys.cs University of the Punjab Lahore-54590 Pakistan Depa.tment of Phys.cs University of California Berkeley California-P4720 USA

s.Co5/Fe65Co35 a.d s.Co5/Fe s.ring excha.ge ma.nets.a.e fa.rica.ed by dc ma.netron s.uttering on MgO s.bs.ra.es.a.d 100-nm-thick s.3N4 membra.es. res.ectively. The ba.0} pres.ure of s.uttering cha.ber is.kept below 10^-7 Tort, a.d a. pres.ure is.3 to 8mTorr. The s.mples.a.e cha.a.terized by a. x-ra. diffra.tometer, a.s.perconducting qua.tum interference ma.netometer, a.d high res.lution ma.netic s.ft x-ra. micros.opy. We obta.n the complete excha.ge coupling a.d s.ngle pha.0} beha.iour of compos.te ma.nets. The （BH）ma. va.ue a.hieved is.28.8 MGOe.

关键词： the power-la. exponents precipita.ion dura.ive a.rupt precipita.ion cha.ge