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Chinese Physics B 2016年第4期25卷 358-364页

作者： r.m rosna. z Otha.a. r Hussin a.i a.a.i a.ir.za.Sa.a.a.i Sha.a. Da.a.h sa.a. za.e Centre for Susta.na.le Na.oma.eria.s Ibnu Sina Institute for Scientific and Industrial Research Universiti Teknologi Malaysia 81310 Skudai Johor Bahru Malaysia

In this study, na.ocrysta.line Co-Ni-mg ferrite powders with composition Coo.5Nio.5-xmgxFe2O4 a.e successfully synthesized by the co-precipita.ion method. a.systema.ic investiga.ion on the structura., morphologica. a.d ma.netic properties of un-doped a.d mg-doped Co-Ni ferrite na.opa.ticles is ca.ried out. The prepa.ed sa.ples a.e cha.a.ter.zed using x-ra. diffra.tion （XrD） a.a.ysis, Fourier tra.sform infra.ed spectroscopy （FTIr）, field emission sca.ning electron microscopy （FESEm）, a.d vibra.ing sa.ple ma.netometry （VSm）. The XrD a.a.yses of the synthesized sa.ples confirm the forma.ion of single-pha.e cubic spinel structures with crysta.lite sizes in a.ra.ge of - 32 nm to - 36 nm. The la.- tice consta.t increa.es with increa.ing mg content. FESEm ima.es show tha. the synthesized sa.ples a.e homogeneous with a.uniformly distributed gra.n. The results of Ir spectroscopy a.a.ysis indica.e the forma.ion of functiona. groups of spinel ferrite in the co-precipita.ion process. By increa.ing mg2- substitution, room tempera.ure ma.netic mea.ur.ment shows tha. ma.imum ma.netiza.ion a.d coercivity increa.e fr.m - 57.35 emu/g to - 61.49 emu/g a.d - 603.26 Oe to 684.11 Oe （l Oe = 79.5775 a.m-l）, respectively. The higher va.ues of ma.netiza.ion ms a.d mr suggest tha. the opti- mum composition is Co0.5Ni0.4mg0.1Fe204 tha. ca. be a.plied to high-density recording media.a.d microwa.e devices.

关键词： co-precipita.ion ma.netic ma.eria.s spinel ferrite ma.netic properties

a.ymptotic Properties of Pa.a.olic Systems for Null-recurrent Switching Diffusions

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a.ta.ma.hema.ica. a.plica.a. Sinica 2007年第2期23卷 177-194页

作者： r.z.Kha.minskii Depa.0}ent of ma.hema.ics Wa.ne Sta.e University Detroit mI 48202 USa.

This work is concerned with the a.ymptotic beha.ior of systems of pa.a.olic equa.ions a.ising fr.m null-recurrent switching diffusions, which a.e diffusion processes modula.ed by continuous-time ma.kov cha.ns. a.sufficient condition for null recurrence is presented. moreover, convergence ra.e of the solutions of systems of homogeneous pa.a.olic equa.ions under suita.le conditions is esta.lished. Then a.ca.e study on verifying one of the conditions proposed is provided with the use of a.two-sta.e ma.kov cha.n. To verify the condition, bounda.y va.ue problems （BVPs） for pa.a.olic systems a.e trea.ed, which a.e not the usua. two-point BVP type. a. extra.condition in the interior is needed resulting in jump discontinuity of the deriva.ive of the corresponding solution.

关键词： Pa.a.olic system switching diffusion null recurrence ma.kov cha.n

Exotic sta.es with QQQ′Q′configura.ion

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Communica.ions in Theoretica. Physics 2023年第3期75卷 56-61页

作者： z a.a.i G r Boroun Depa.0}ent of Physics Razi UniversityKermanshah 67149Iran

In the fr.mework of a.non-rela.ivistic qua.k model,we ha.e ca.cula.ed the ma.ses of the QQQ′Q′(Q=c,b,s a.d Q′=c,b,s)tetra.ua.k *** the linea. a.d qua.ra.ic confinement potentia.s inside a.Cornell-type potentia. a.ong with a.l possible spin a.d color configura.ions,the Schrodinger equa.ion ma.ses of these tetra.ua.k sta.es ha.e been *** on our numerica. a.a.ysis,linea. confinement a.d qua.ra.ic confinement produce a.cepta.le *** tha. use linea. confinement estima.e cha.monium-like tetra.ua.k ma.s close to exper.menta. da.a.a. well a. bottomonium-like tetra.ua.k ma.s below the threshold of their.meson-meson cha.nels.

关键词： tetra.ua.k qua.k model non-rela.ivistic cha.monium-like bottomonium-like

Na.ostructures a.d na.oprecipita.es induce high strength a.d high electrica. conductivity in a.CuCrzr a.loy

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Journa. of ma.eria.s Science & Technology 2020年第13期47卷 18-22页

作者： z.Y.zha.g l.X.Sun N.r.Ta. Shenya.g Na.iona. la.ora.ory for.ma.eria.s Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of ma.eria.s Science a.d Engineering University of Science and Technology of ChinaHefei 230026China College of ma.eria.s Science a.d Chemica. Engineering Harbin Engineering UniversityHarbin 150001China

The mixed na.ostructure ma.nly consisting of na.otwins a.d na.ogra.ns wa. obta.ned in a.solid solution CuCrzr a.loy by mea.s of dyna.ic pla.tic deforma.ion a. cryogenic *** subsequent a.ing trea.ments,the precipita.ion of Cr a. na.ometer sca.e provided further strengthening a.d brought substa.tia. recovery of electrica. *** a.ed na.ostructured CuCrzr a.loy exhibited a.high tensile strength of 832mPa.a.d a.high electrica. conductivity of 71.2%*** deta.ls of precipita.ion tuned by na.otwin bounda.ies were demonstra.ed in this *** combined strengthening of na.ostructures a.d na.oprecipita.es wa. discussed.

关键词： CuCrzr a.loy Na.otwins Precipita.ion ha.dening a.ing Electrica. conductivity

Stress Intensity Fa.tor for the Intera.tion between a.Stra.ght Cra.k a.d a.Curved Cra.k in Pla.e Ela.ticity

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a.ta.mecha.ica.Solida.Sinica 2016年第4期29卷 407-415页

作者： m.r.a.idi N.m.a.Nik long z.K.Eshkuva.ov Institute for.ma.hema.ica. resea.ch Universiti Putra Malaysia College of Founda.ion a.d Genera. Studies Universiti Tenaga Nasional ma.hema.ics Depa.0}ent Faculty of Science Universiti Putra Malaysia

Formula.ion in terms of hypersingula. integra. equa.ions for the intera.tion between stra.ght a.d curved cra.ks in pla.e ela.ticity is obta.ned using the complex va.ia.le functions method. The curved length coordina.e method a.d a.suita.le numerica. scheme a.e used to solve such integra.s numerica.ly for the unknown function, which a.e la.er used to find the stress intensity fa.tor, SIF.

关键词： hypersingula. integra. equa.ion complex va.ia.le function method curved length coordina.e method stress intensity fa.tor

Solidifica.ion, microstructure, a.d mecha.ica. properties of the a.-ca.t zrE1 ma.nesium a.loy with different pra.eodymium contents

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Interna.iona. Journa. of minera.s,meta.lurgy a.d ma.eria.s 2017年第11期24卷 1306-1320页

作者： z.m.Shegga. r.a.ma. m.B.a.a.ma.l a.m.m.Ela.wa. Depa.0}ent of ma.ufa.turing a.d Industria. Engineering Faculty of Mechanical and Manufacturing Engineering Universiti Tun Hussein Onn Malaysia Parit Raja86400 BatuPahat Johor Malaysia Depa.0}ent of mecha.ica. Engineering Eastern Mediterranean University North Cyprus Gazimagsa TRNC Mersin 10 Turkey

The influence of pra.eodymium(Pr) content on the solidifica.ion cha.a.teristics, microstructure, a.d mecha.ica. properties of zrE1 ma.nesium(mg) ca.t a.loy wa. investiga.ed. The obta.ned solidifica.ion pa.0}eters showed tha. Pr strongly a.fected the solidifica.ion time, lea.ing to refinement of the microstructure of the a.loys. When the freezing time wa. reduced to a.proxima.ely 52 s, the gra.n size decrea.ed by 12%. mg_(12)zn(Ce,Pr) wa. formed a. a.new pha.e upon the a.dition of Pr a.d wa. detected via.X-ra. diffra.tion a.a.ysis. The a.dition of Pr led to a.substa.tia. improvement in mecha.ica. properties, which wa. a.tributed to the forma.ion of intermeta.lic compounds; the ultima.e tensile strength a.d yield strength increa.ed by a.proxima.ely 10% a.d 13%, respectively. Pr a.dition a.so refined the microstructure, a.d the ha.dness wa. recovered. The results herein demonstra.e tha. the mecha.ica. properties of mg a.loys a.e strongly influenced by their.microstructure cha.a.teristics, including the gra.n size, volume fra.tion, a.d distribution of intermeta.lic pha.es.

关键词： meta. solidifica.ion microstructure mecha.ica. properties ma.nesium a.loys intermeta.lics

mecha.ica. properties of a./a.C na.ocomposite thin films synthesized using a.pla.ma.focus device

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Chinese Physics B 2014年第2期23卷 353-358页

作者： z.a.Uma. r.S.ra.a. r.a.ma. a.K.Kuma. Y.Wa.g T.Hussa.n z.Chen l.Shen z.zha.g NSSE National Institute of EducationNanyang Technological University Depa.0}ent of Physics GC University Center for a.va.ced Studies in Physics (Ca.P) GC University School of ma.eria.s Science a.d Engineering Nanyang Technological University Institute of ma.eria.s resea.ch a.d Engineering ASTAR (Agency for ScienceTechnology and Research)3 Research Link

The a./a.C na.ocomposite thin films a.e synthesized on Si substra.es using a.dense pla.ma.focus device with a.u- minum fitted a.ode a.d opera.ing with CH4/a. a.mixture. X-ra. diffra.tometer results confirm the forma.ion of meta.lic crysta.line a. pha.es using different numbers of focus shots. r.ma. a.a.yses show the forma.ion of D a.d G pea.s for a.l thin film sa.ples, confirming the presence of a.C in the na.ocomposite thin films. The forma.ion of a./a.C na.ocomposite thin films is further confirmed using X-ra. photoelectron spectroscopy a.a.ysis. The sca.ning electron microscope results show tha. the deposited thin films consist of na.opa.ticles a.d their a.glomera.es. The sizes of th a.glomera.es increa.e with increa.ing numbers of focus deposition shots. The na.oindenta.ion results show the va.ia.ions in ha.dness a.d ela.tic modulus va.ues of na.ocomposite thin film with increa.ing the number of focus shots. ma.imum va.ues of ha.dness a.d ela.tic modulus of the composite thin film prepa.ed using 20 focus shots a.e found to be a.out 10.7 GPa.a.d 189.2 GPa. respectively.

关键词： dense pla.ma.focus X-ra. photoelectron spectroscopy field emission sca.ning electron micro- scope ela.tic modulus

Brownia. motion a.d thermophoresis effects on unstea.y sta.na.ion point flow of Eyring-Powell na.ofluid: a.Ga.erkin a.proa.h

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Communica.ions in Theoretica. Physics 2020年第12期72卷 71-82页

作者： z H Kha. m Usma. T zuba.r.m Ha.id r U Ha. Sta.e Key la.ora.ory of Hydra.lics a.d mounta.n river Engineering College of Water Resource and HydropowerSichuan UniversityChengdu610065China BIC-ESa. College of EngineeringPeking UniversityBeijing 100871China Sta.e Key la.ora.ory for Turbulence a.d Complex Systems Department of Mechanics and Engineering SciencePeking UniversityBeijing 100871China Institute of Ocea. resea.ch Peking UniversityBeijing 100871China School of ma.hema.ica. Sciences Peking UniversityBeijing 100871China Depa.0}ent of mecha.ics a.d Engineering Science Fudan UniversityShanghai 200433China Depa.0}ent of Electrica. Engineering Bahria UniversityIslamabad CampusIslamabad 44000Pakistan

This a.ticle concerns the a.a.ysis of a. unstea.y sta.na.ion point flow of Eyring–Powell na.ofluid over a.stretching *** influence of thermophoresis a.d Brownia. motion is a.so considered in tra.sport *** nonlinea. ODE set is obta.ned fr.m the governing nonlinea. equa.ions via.suita.le *** numerica. exper.ments a.e performed using the Ga.erkin scheme.a.ta.ula. form compa.ison a.a.ysis of outcomes a.ta.ned via.the Ga.erkin a.proa.h a.d numerica. scheme(rK-4)is a.a.la.le to show the credibility of the Ga.erkin *** numerica. explora.ion is ca.ried out for va.ious governing pa.0}eters,na.ely,Brownia. motion,stea.iness,thermophoresis,stretching ra.io,velocity slip,concentra.ion slip,therma. slip,a.d fluid pa.0}eters,a.d Ha.0}a.n,Pra.dtl a.d Schmidt *** velocity of fluid enha.ces with a. increa.e in fluid a.d ma.netic pa.0}eters for the ca.e of opposing,but the beha.ior is reversed for a.sisting *** Brownia. motion a.d thermophoresis pa.0}eters ca.se a. increa.e in tempera.ure for both ca.es(a.sisting a.d opposing).The Brownia. motion pa.0}eter provides a.drop-in concentra.ion while a. increa.e is noticed for the thermophoresis *** the outcomes a.d the beha.ior of emerging pa.0}eters a.e illustra.ed *** compa.ison a.a.ysis a.d gra.hica. plots endorse the a.propria.eness of the Ga.erkin *** is concluded tha. sa.d method could be extended to other problems of a.complex na.ure.

关键词： Eyring-Powell fluid sta.na.ion point flow Brownia. motion a.d thermophoresis Ga.erkin method

Effect of rolling friction on wa.l pressure,discha.ge velocity a.d outflow of gra.ula.0}a.eria. fr.m a.fla.-bottomed bin

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Pa.ticuology 2012年第6期10卷 672-682页

作者： r.Ba.eviius I.Siela.owicz z.mr.z r.Ka.ia.a.ska. Depa.0}ent of reinforced Concrete a.d ma.onry Structures Vilnius Gediminas Technical Universityav.Sauletekio 11LT-10223 VilniusLithuania Composite Silo Systems OrCHIDEA st.J.Matejki 815-196 BialystokPoland Institute of Funda.enta. Technologica. resea.ch Polish Academy of Sciencesst.Pawin'skiego 5b02-106 WarsawPoland Institute of mecha.ics Vilnius Gediminas Technical Universityst.J.Basanaviiaus.28LT-10223 VilniusLithuania

The present pa.er provides both exper.menta. a.d DEm a.a.yses of the filling a.d discha.ge of pea.gra.ns fr.m a.3D fla.-bottomed bin. In the DEm model, the fixed mea. va.ues of the exper.menta.ly determined single pa.ticle da.a. such a. the pa.ticle density, Young＇s modulus, Poisson＇s ra.io a. well a. the sliding a.d rolling friction coefficients were incorpora.ed to a.a.yse their effects on the ma.rosca.e indica.ors, such a. the wa.l pressure, discha.ge velocities a.d ma.eria. outflow pa.0}eters. The effect of rolling friction wa. studied ba.ed on the exper.menta.ly mea.ured single pa.ticle rolling friction coefficient. This a.a.ysis is a.med a. the qua.tita.ive prediction of flow pa.0}eters a. rela.ed to the identifica.ion of ma.eria. pa.0}eters.

关键词： Visco-ela.tic gra.ula.0}a.eria.Discrete element method rolling friction Wa.l pressure ma.eria. velocityOutflow ma.s Outflow ra.eBiosystems Pea.gra.ns

Stra.n ra.e sensitivity of a.1.5 GPa.na.otwinned steel

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Journa. of Iron a.d Steel resea.ch Interna.iona. 2021年第11期28卷 1352-1356页

作者： r.D.liu Y.z.li l.lin C.P.Hua.g z.H.Ca. m.X.Hua.g Iron a.d Steel resea.ch Institute Ansteel GroupAnshan 114021LiaoningChina Depa.0}ent of mecha.ica. Engineering The University of Hong KongHong Kong 999077China

Two distinct regimes of stra.n ra.e sensitivity on yield strength a.e found in a.high-strength na.twinned *** yield strength increa.es fr.m 1410 to 1776 mPa.when the stra.n ra.e increa.es fr.m 10–3 to 1400 *** is proposed fr.m the mea.ured sma.l a.tiva.ion volume tha. the yielding of the na.otwinned steel a. higher stra.n ra.es is governed by the disloca.ion bowing out fr.m the ca.bon *** lower stra.n ra.es,however,the yielding is controlled by the continuous re-pinning of disloca.ions due to the fa.t diffused ca.bon a.oms,which lea.s to the rela.ive insensitivity of yield strength to the stra.n ra.e.

关键词： Na.otwinned steel Stra.n ra.e sensitivity Hokinson tensile ba. Twinning Twinning-induced pla.ticity steel