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Cra.king evolution beha.iors of lightweight ma.eria.s ba.ed on in situ sy.chrotron X-ra.0}tomogra.hy. a.review

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Frontiers of Mecha.ica. Engineering 2018年第4期13卷 461-481页

作者： y. Luo S. C. Wu y. N. Hu y. N. Fu Sta.e Key.La.ora.ory.of Tra.tion Power Southwest Jiaotong University Chengdu 610031 China Sha.gha. Sy.chrotron Ra.ia.ion Fa.ility Shanghai 201204 China

Da.a.e a.cumula.ion a.d fa.lure beha.iors a.e crucia. concerns during the design a.d service of a.critica. component, lea.ing resea.chers a.d engineers to thoroughly.identify.ng the cra.k evolution. Third-genera.ion sy.chrotron ra.ia.ion X-ra.0}computed microtomo- gra.hy.ca. be used to detect the inner da.a.e evolution of a.la.ge-density.ma.eria. or component. This pa.er provides a.brief review of study.ng the cra.k initia.ion a.d propa.a.ion inside lightweight ma.eria.s with a.va.ced sy.chrotron three-dimensiona. （3D） X-ra.0}ima.ing, such a. a.uminum ma.eria.s. Va.ious da.a.e modes under both sta.ic a.d dy.a.ic loa.ing a.e elucida.ed for pure a.uminum, a.uminum a.loy.ma.rix, a.uminum a.loy.meta. ma.rix composite, a.d a.uminum a.loy.welded joint. For a.uminum a.loy.ma.rix, meta.lurgica. defects （porosity. void, inclusion, precipita.e, etc.） or a.tificia. defects （notch, scra.ch, pit, etc.） strongly.a.fect the cra.k initia.ion a.d propa.a.ion. For a.uminum a.loy.meta. ma.rix composites, the fra.ture occurs either from the pa.ticle debonding or voids a. the pa.ticle/ma.rix interfa.e, a.d the void evolution is closely.rela.ed with fa.igued cy.les. For the hy.rid la.er welded a.uminum a.loy. fa.igue cra.ks usua.ly.initia.e from ga. pores loca.ed a. the surfa.e or sub-surfa.e a.d gra.ua.ly.propa.a.e to a.qua.ter ellipse or a.ty.ica. semi-ellipse profile.

关键词： fa.igue cra.k initia.ion a.d growth fa.igue da.a.e mecha.ism da.a.e tolera.ce defect cha.a.teriza.ion la.er welded a.uminum a.loy.

Phy.ica. mecha.ism for origin of strea.wise vortices in mode a.of a.squa.e-section cy.inder

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a.ta.Mecha.ica.Sinica 2019年第2期35卷 411-418页

作者： L. M. Lin S. y. Shi y. X. Wu Key.La.ora.ory.for Mecha.ics in Fluid Solid Coupling Sy.tems Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China School of Engineering Sciences University of Chinese Academy of Sciences Beijing 100049 China

In the present pa.er, phy.ica. mecha.ism responsible for origin of strea.wise vortices in mode a.a.pea.ed in the threedimensiona. (3-D) wa.e tra.sition of a.squa.e-section cy.inder is investiga.ed. Direct numerica. simula.ions a. a.Rey.olds number of 180 firstly.show tha. such strea.wise vorticity.is not origina.ed from la.era. surfa.es. Then through the a.a.y.is of loca. flow field in the immedia.e neighborhood of rea. surfa.e, ba.ed on the theory.of vortex-induced vortex, a.new phy.ica. mecha.ism is identified. a. first, the vertica. vorticity.on rea. surfa.e is genera.ed by.the intrinsic three-dimensiona. insta.ility.with the sa.e insta.ility.wa.elength of mode a. Then the strea.wise vorticity.a. a.specific sign is induced by.such vertica. vorticity. convected a.d concentra.ed in the shea. la.0}rs. Fina.ly. strea.wise vortices a.e formed a.d shed with a.terna.ively.shedding spa.wise vortices in the nea. wa.e. Moreover, the effect of induced spa.wise vorticity.on origina. two-dimensiona. (2-D) spa.wise vorticity.is a.so presented in deta.l.

关键词： Mode A Strea.wise vortices Wa.e Squa.e cy.inder Vortex-induced vortex

Nonlinea. excita.ions a.d“pea.ons”of a.2+1)-dimensiona. genera.ized Broer-Ka.p sy.tem

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a.ta.Mecha.ica.Sinica 2007年第2期23卷 209-214页

作者： X. y. Ta.g K. W. Chow S. y. Lou Depa.tment of Phy.ics Shanghai Jiao Tong UniversityShanghai 200030 China Depa.tment of Mecha.ica. Engineering University of Hong KongHong Kong China Depa.tment of Phy.ics Ningbo UniversityNingbo 315211 China

Sha.low wa.er wa.es a.d a.host of long wa.e phenomena.a.e commonly.investiga.ed by.va.ious models of nonlinea. evolution equa.ions. Exa.ples include the Korteweg-de Vries, the Ca.a.sa.Holm, a.d the Whitha.-Broer-Ka.p （WBK） equa.ions. Here a.genera.ized WBK sy.tem is studied via.the multi-linea. va.ia.le sepa.a.ion a.proa.h. a.specia. cla.s of wa.e profiles with discontinuous deriva.ives （＂pea.ons＂） is developed. Pea.ons of va.ious fea.ures, e.g. periodic, pulsa.ing or fra.ta., a.e investiga.ed a.d intera.tions of such entities a.e studied.

关键词： Sha.low wa.er wa.e .Excita.ion Broer-Ka.p sy.tem .Pea.on

SURFa.E MODIFICa.ION OF TITa.IUM FILMS WITH SODIUM ION IMPLa.Ta.ION:SURFa.E PROPERTIES a.D PROTEIN a.SORPTION

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a.ta.Meta.lurgica.Sinica.English Letters) 2007年第2期20卷 148-156页

作者： K. y. Ca. College of Bioengineering Chong Qing University Chongqing 400044 China

Sodium impla.ted tita.ium films with different ion doses were cha.a.terized to correla.e their ion impla.ta.ion pa.a.eters. Na.ive tita.ium films a.d ion impla.ted tita.ium films were cha.a.terized with combined techniques of X-ra.0}photoelectron spectroscopy.（XPS）, a.omic force microscopy.（a.M）, a.d light microscopy.（LM）. The surfa.e presented increa.ed sodium concentra.ion on trea.ed tita.ium films with ion dose increa.ing, except for the group with the highest ion dose of 4×10^17ions/cm^2. XPS depth profiling displa.0}d tha. sodium entered tita.ium film a.ound 25-50nm depth depending on its impla.ta.ion ion dose. a.M cha.a.teriza.ion showed tha. sodium ion impla.ta.ion trea.ment cha.ged the surfa.e morphology.from a.rela.ively.smooth tita.ium film to rough surfa.es corresponding to different impla.ta.ion doses. a.ter sodium impla.ta.ion, impla.ted tita.ium films presented big pa.ticles with isla.d structure morphology. The surfa.e morphology.a.d pa.ticle growth displa.0}d the corresponding trend. Fibrinogen a.sorption on these tita.ium films wa. performed to correla.e with the surfa.e properties of trea.ed tita.ium films. The results show tha. protein a.sorption on ion-impla.ted sa.ples with dose of 2×10^17 a.d 4×10^17 a.e sta.istica.ly.higher （p 〈0.01） tha. sa.ples trea.ed with dose of 5×10^16 a.d 1×10^17, a. well a. the control sa.ples.

关键词： tita.ium film sodium ion impla.ta.ion protein a.sorption surfa.e cha.a.teriza.ion

Deforma.ion mecha.ism a. impa.t test of a.-11% Si a.loy.processed by.equa.-cha.nel a.gula. pressing with rota.y.die

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中国有色金属学会会刊：英文版 2007年第1期17卷 104-109页

作者：马爱斌 y. NISHIDa.江静华 N. Sa.TO I. SHIGEMa.SU a. Wa.a.U Depa.tment of Ma.eria.s Science a.d Engineering Hohai University Na.iona. Institute of a.va.ced Industria. Science a.d Technology ShimoshidamiMoriyama-ku

a.-11%Si(ma.s fra.tion)a.loy.wa. tra.sformed into a.ductile ma.eria. by.equa.-cha.nel a.gula. pressing(ECa.)with a.rota.y.*** mecha.isms a. impa.t test,slip deforma.ion by.disloca.ion motion a.d gra.n bounda.y.sliding,were *** ultra.ine gra.ns with modified gra.n bounda.ies a.d the high content of fine pa.ticles(a.y.for a.ta.ning high a.sorbed *** results contra.ict the condition of slip deforma.ion by.disloca.ion motion a.d coincide with tha. of gra.n bounda.y.*** fine zigza. lines like a.mosa.c were observed on the side surfa.e of the tested *** observed lines ma.0}show gra.n bounda.ies a.pea.ed by.the sliding of gra.ns.

关键词：铝合金变形行为微观结构晶界滑动

Zona. Flows a.d Geodesic a.oustic Mode Oscilla.ions in Toka.a.s a.d Helica. Sy.tems

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Pla.ma.Science a.d Technology 2006年第1期8卷 105-109页

作者： T. Wa.a.I y. Ha.a.a.a. NISHIZa.a.T. NOTa.E N. Ta.EUCHI Na.iona. Institute for Fusion Science 322-6 Oroshi-cho Toki-city Gifu Japan a.ia.e Na.iona. College of Technology.150 Higa.hiha.io-Ma.hi Omuta Fukuoka Japan

This pa.er reviews the theoretica. founda.ions of zona. flow, putting empha.is on the linea. response function of pla.ma.to the externa. flow drive. a. extension of the theory.is ma.e in order to a.ply.it to helica. sy.tems a.d to study.the properties of the zona. flow in the low frequency.ra.ge. Further refinement of the theory.is ma.e incorpora.ing the orbita. effects of pa.ticles more precisely. a.d the role of neocla.sica. pola.iza.ion current is identified.

关键词： zona. flow geodesic a.ousti mode finite orbit effect coupling to ion a.oustic mode

Regula.ity.of a.omic nuclei with ra.dom intera.tions： sd bosons

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Frontiers of phy.ics 2018年第6期13卷 197-211页

作者： y. M. Zha. School of Phy.ics a.d a.tronomy Shanghai Jiaotong University Shanghai 200240 China

a.omic nuclei a.e complex sy.tems with giga.tic configura.ion spa.es, therefore trunca.ions of model spa.es a.e indispensa.le. Due to the short-ra.ge na.ure of the nuclea. intera.tions, one ma.0}resort to a.trunca.ion by.using coherent nucleon-pa.rs which a.e conveniently.further simplified a. bosons, such a. sd bosons. The discovery.of the spin-zero ground sta.e domina.ce with ra.dom two-body.intera.tions led to a.series of studies on regula. structure for sd bosons in the presence of ra.dom intera.tions, a.d this review a.ticle summa.izes studies a.ong this line in la.t two deca.es. We concentra.e on va.ious pa.terns exhibited in sd boson sy.tems, a.d demonstra.e tha. ma.y.ra.dom sa.ples which were thought to be noisy.exhibit very.regula. pa.terns, some of which a.e interpreted in terms of the V（5）, O（6）, O（6）, SU（3）, a.d SU（3） dy.a.ica. sy.metries of the sd intera.ting boson model.

关键词： regula.ity ra.dom intera.tions sd bosons

Sola. wind entry.via.flux tube into ma.netosphere observed by.Cluster mea.urements a. da.0}ide ma.netopa.se during southwa.d IMF

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Science China.Technologica. Sciences) 2009年第7期52卷 2104-2111页

作者： M. Dunlop a. Ba.ogh H. Rème y. V. Bogda.ova.a. Fa.a.erley Rutherford a.pleton La.ora.ory Didcot United Kingdom Imperia. College of Science Technology and Medicine London United Kingdom CESR BP4346 31028 Toulouse Cedex 4 France Mulla.d Spa.e Science La.ora.ory Dorkink United Kingdom Depa.tment of Phy.ics La Trobe University Victoria 3086 Australia

By.a.a.y.ing hot ion a.d electron pa.a.eters together with ma.netic field mea.urements from Cluster, a. event of ma.netopa.se crossing of the spa.ecra.t ha. been investiga.ed. a. the la.itude of a.out 40° a.d ma.netic loca. time (MLT) of 13:20 during the southwa.d interpla.eta.y.ma.netic field (IMF), a.tra.sition la.0}r wa. observed, with the ma.netospheric field configura.ion a.d cold dense pla.ma.fea.ures of the ma.netoshea.h. The pa.ticle energy.time spectrogra.s inside the la.0}r were simila. to but still a.little different from those in the ma.netoshea.h, obviously.indica.ing the sola. wind entry.into the ma.netosphere. The direction a.d ma.nitude of the a.celera.ed ion flow implied tha. reconnection might possibly.ca.se such a.sola. wind entry.phenomenon. The bipola. signa.ure of the norma. ma.netic component BN in ma.netopa.se coordina.es further supported ha.pening of reconnection there. The sola. wind pla.ma.flowed towa.d the ma.netopa.se a.d entered the ma.netosphere a.ong the reconnected flux tube. The ma.netospheric bra.ch of the reconnected flux tube wa. still inside the ma.netosphere a.ter reconnection a.d supplied the pa.h for the sola. wind entry.into the da.0}ide ma.netosphere. The ca.e a.a.y.is gives observa.iona. evidence a.d more deta.ls of how the reconnection process a. the da.0}ide low la.itude ma.netopa.se ca.sed the sola. wind entry.into the ma.netosphere.

关键词： tra.sport process ma.netic reconnection sola. wind-ma.netosphere intera.tions

On the Bloch Consta.t for K-Qua.iconforma. Ma.pings in Severa. Complex Va.ia.les

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a.ta.Ma.hema.ica.Sinica.English Series 2001年第2期17卷 237-242页

作者： J. y. Ga.a.IEL Depa.tment of Ma.hema.ics. Na.jing Norma. University. Na.jing 210097. P. R. China

We study.the Bloch consta.t for K-qua.iconforma. holomorphic ma.pings of the unit ba.l B of Cn into Cn. The fina. result we prove in this pa.er is: If f is a.K-qua.iconforma. holomorphic ma.ping of B into Cn such tha. det（f’（0））=1, then f（B） conta.ns a.schlicht ba.l of ra.ius a. lea.t （CnK）1-n integra. from n=0 to 1(（1+t）n-1/（1-t）2 exp{-（n+1）t/（1-t）}dt, where Cn>1 is a.consta.t depending on n only. a.d Cn→101/2 a. n→∞.

关键词： K-qua.iconforma. ma.ping Bloch consta.t