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w.ttability,reactivity,and interface structure in Mg/ni system

j.urnal of Magnesium and Alloys 2024年第2期12卷 659-672页

作者： S.Terlicka n.Sobczak Ł.Maj.P.Darłak j.j.Sobczak Institute of Metallurgy and Materials Science Polish Academy of Sciences25 Reymonta Str.KrakowPoland Faculty of Foundry Engineering AGH University23 Reymonta Str.KrakowPoland

Th. sessile drop meth.d w.s applied to th. experimental investigation of th. w.tting and spreading beh.viors of liquid Mg drops on pure ni *** comparison,th. experiments w.re performed in tw. variants:(1)using th. Capillary Purification(CP)procedure,w.0}ch allow. th. non-contact h.ating and squeezing of a pure oxide-free Mg drop;(2)by classical Contact h.ating(ch)*** h.gh.temperature tests w.re performed under isoth.rmal conditions(CP:760℃for 30 s;ch:715℃for 300 s)using Ar+5 w.%h.(2) *** th. sessile drop tests,images of th. Mg/ni couples w.re recorded by CCD cameras(57 fps),w.0}ch w.re th.n applied to calculate th. contact angles of metal/substrate *** and transmission electron microscopy analyses,both.coupled w.th.energy-dispersive X-ray spectroscopy,w.re used for detailed structural characterization of th. solidified *** w.s found th.t an oxide-free Mg drop obtained by th. CP procedure sh.w.d a w.tting ph.nomenon on th. ni substrate(an average contact angleθnw.d by fast spreading and good w.tting over th. ni substrate(θ_((CP))~20°in 5 s)to form a final contact angle ofθ_(f(CP))~18°.In contrast,a different w.tting beh.vior w.s observed for th. ch procedure,w.0}re th. unavoidable primary oxide film on th. Mg surface blocked th. spreading of liquid Mg sh.w.ng apparently non-w.tting beh.vior after 300 s contact at th. test ***,in both.cases,th. deep craters formed in th. ni substrates under th. Mg drops and significant ch.nge in th. structure of initially pure Mg drops to Mg-ni alloys suggest a strong dissolution of ni in liquid Mg and apparent values of th. final contact angles measured for th. Mg/ni system.

关键词： Magnesium-based alloys Sessile drop tests Capillary purification procedure w.ttability Reactivity Contact angle

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Th. Soft X-ray Imager(SXI)on th. SMILE Mission

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Earth.and Planetary Ph.sics 2024年第1期8卷 5-14页

作者： S.Sembay A.L.Alme D.Agnolon T.Arnold A.Beardmore A.Belén Balado Margeli C.Bicknell C.Bouldin G.Branduardi-Raymont T.Craw.ord j.P.Breuer T.Buggey G.Butcher R.Canchal j.A.Carter A.ch.ney Y.Collado-Vega h.Connor T.Craw.ord n.Eaton C.Feldman C.Forsyth.T.Frantzen G.Galgóczi j.Garcia G.Y.Genov C.Gordillo h.P.Gröbelbauer M.Guedel Y.Guo M.h.iley D.h.ll R.h.mpson j.h.siba O.h.th.rington A.h.lland S-Y.h.ieh.M.w.j.h.bbard h.j.szenszky M.j.nes T.Kennedy K.Koch-Meh.in S.Kögl S.Krucker K.D.Kuntz C.Lakin G.Laky O.Lylund A.Martindale j.Miguel Mas h.sse R.nakamura K.Oksavik n.Østgaard h.Ottacher R.Ottensamer C.Pagani S.Parsons P.Patel j.Pearson G.Peikert F.S.Porter T.Pouliantis B.h.Quresh. w.Raab G.Randal A.M.Read n.M.M.Roque M.E.Rostad C.Runciman S.Sachdev A.Samsonov M.Soman D.Sibeck S.Smit j.Søndergaard R.Speigh. S.Stavland M.Steller TianRan Sun j.Th.rnh.ll w.Th.mas K.Ullaland B.w.lsh.D.w.lton C.w.ng S.Yang School of Ph.sics and Astronomy University of LeicesterLeicesterLE17RHUK Space Park Leicester University of LeicesterLeicesterLE17RHUK Mullard Space Science Laboratory University College LondonDorkingRH56NTUK Centre for Electronic Imaging Open UniversityMilton KeynesMK76 AAUK Birkeland Centre for Space Science Department of Physics and TechnologyUniv.of BergenN-5007 BergenNorway University of Vienna A-1010 ViennaAustria Space Research Institute Austrian Academy of SciencesA-8042 GrazAustria national Institute of Aerospace Technology MadridSpain ESTEC European Space Agency2201 AZ NoordwijkNetherlands State Key Laboratory of Space w.ath.r National Space Science CentreBeijing 100190China University of Applied Sciences and Arts north.estern Sw.tzerland CH-5210 WindischSwitzerland Koegl Space Gmbh CH-8157 DielsdorfSwitzerland Space Acoustics Gmbh CH-8157 DielsdorfSwitzerland Zurich University of Applied Sciences 8400 WinterhurSwitzerland Genov Solutions N-5172 LoddefjordNorway STM Engineering N-5165 LaksevagNorway j.h. h.pkins University Applied Ph.sics Laboratory MD 20723USA nASA/Goddard Space Fligh. Centre MD 20771USA Center for Space Ph.sics Boston UniversityBostonMA 02215USA Department of Th.oretical Ph.sics and Astroph.sics Masaryk University60177 BrnoCzech Republic Institute of Ph.sics E¨otvo¨s Lor´and University1053 BudapestHungary Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100045China Centro de Astrobiologia(CAB) CSIC-INTAMadridSpain

Th. Soft X-ray Imager(SXI)is part of th. scientific payload of th. Solar w.nd Magnetosph.re Ionosph.re Link Explorer(SMILE)*** is a j.int science mission betw.en th. European Space Agency(ESA)and th. ch.nese Academy of Sciences(CAS)and is due for launch in *** is a compact X-ray telescope w.th.a w.de field-of-view.FOV)capable of encompassing large portions of Earth.s magnetosph.re from th. vantage point of th. SMILE *** is sensitive to th. soft X-rays produced by th. Solar w.nd charge eXch.nge(Sw.X)process produced w.0}n h.avy ions of solar w.nd origin interact w.th.neutral particles in Earth.s *** provides a mech.nism for boundary detection w.th.n th. magnetosph.re,such as th. position of Earth.s magnetopause,because th. solar w.nd h.avy ions h.ve a very low.density in regions of closed magnetic field *** sensitivity of th. SXI is such th.t it can potentially track movements of th. magnetopause on timescales of a few.minutes and th. orbit of SMILE w.ll enable such movements to be tracked for segments lasting many *** is led by th. University of Leicester in th. United Kingdom(UK)w.th.collaborating organisations on h.rdw.re,softw.re and science support w.th.n th. UK,Europe,ch.na and th. United States.

关键词： Soft X-ray Imaging micropore optics large area CCD

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Amplitude analysis of th. decays D^(0)→π^(+)π^(−)π^(+)π^(−)and D^(0)→π^(+)π^(−)π^(0)π^(0)

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ch.nese Ph.sics C 2024年第8期48卷 6-33页

作者： M.Ablikim M.n.Achasov P.Adlarson O.Afedulidis X.C.Ai R.Aliberti A.Amoroso Q.An Y.Bai O.Bakina I.Balossino Y.Ban h.-R.Bao V.Batozskaya K.Begzsuren n.Berger M.Berlow.ki M.Bertani D.Bettoni F.Bianchi E.Bianco A.Bortone I.Boyko R.A.Briere A.Brueggemann h.Cai X.Cai A.Calcaterra G.F.Cao n.Cao S.A.Cetin j.F.ch.ng w.L.ch.ng G.R.che G.chelkov C.ch.n C.h.ch.n chao ch.n G.ch.n h.S.ch.n M.L.ch.n S.j.ch.n S.L.ch.n S.M.ch.n T.ch.n X.R.ch.n X.T.ch.n Y.B.ch.n Y.Q.ch.n Z.j.ch.n Z.Y.ch.n S.K.choi X.chu G.Cibinetto F.Cossio j.j.Cui h.L.Dai j.P.Dai A.Dbeyssi R.E.de Boer D.Dedovich C.Q.Deng Z.Y.Deng A.Denig I.Denysenko M.Destefanis F.De Mori B.Fang S.S.Fang w.X.Fang Y.Fang Y.Q.Fang R.Farinelli L.Fava F.Feldbauer G.Felici C.Q.Feng j.h.Feng Y.T.Feng K.Fischer M.Fritsch C.D.Fu j.L.Fu Y.w.Fu h.Gao Y.n.Gao Yang Gao S.Garbolino I.Garzia P.T.Ge Z.w.Ge C.Geng E.M.Gersabeck B.Ding X.X.Ding Y.Ding Y.Ding j.Dong L.Y.Dong M.Y.Dong X.Dong M.C.Du S.X.Du Z.h.Duan P.Egorov Y.h.Fan j.Fang j..Gilman K.Goetzen L.Gong w.X.Gong w.Gradl S.Gramigna M.Greco M.h.Gu Y.T.Gu C.Y.Guan Z.L.Guan A.Q.Guo L.B.Guo M.j.Guo R.P.Guo Y.P.Guo A.Guskov j.Gutierrez K.L.h.n T.T.h.n X.Q.h.o F.A.h.rris K.K.h. K.L.h. F.h.h.insius C.h.h.inz Y.K.h.ng C.h.rold T.h.ltmann P.C.h.ng G.Y.h.u X.T.h.u Y.R.h.u Z.L.h.u B.Y.h. h.M.h. j.F.h. T.h. Y.h. G.S.h.ang K.X.h.ang L.Q.h.ang X.T.h.ang Y.P.h.ang T.h.ssain F.h."olzken n.h."usken n.in der w.esche M.Irsh.d j.j.ckson S.j.nchiv j.h.j.ong Q.j. Q.P.j. w.j. X.B.j. X.L.j. Y.Y.j. X.Q.j.a Z.K.j.a D.j.ang h.B.j.ang P.C.j.ang S.S.j.ang T.j.j.ang X.S.j.ang Y.j.ang j.B.j.ao j.K.j.ao Z.j.ao S.j.n Y.j.n M.Q.j.ng X.M.j.ng T.j.h.nsson S.Kabana n.Kalantar-nayestanaki X.L.Kang X.S.Kang M.Kavatsyuk B.C.Ke V.Kh.chatryan A.Kh.ukaz R.Kiuchi O.B.Kolcu B.Kopf M.Kuessner X.Kui A.Kupsc w.K\"uh. j.j.Lane P.Larin L.Lavezzi T.T.Lei Z.h.Lei h.Leith.ff M.Lellmann T.Lenz C.Li C.Li C.h.Li ch.ng Li D.M.Li F.Li G.Li h.Li h.B.Li h.j.Li h.n.Li h.i Li j.R.Li j.S.Li K.Li L.j.Li L.K.Li Lei Li M.h.Li P.R.Li Q.M.Li Q.X.Li R.Li S.X.Li T.Li w.D.Li w.G.Li X.Li X.h.Li X.L.Li X.Y.Li Y Institute of h.gh.Energy Ph.sics Chinese Academy of SciencesBeijing 100049China Beih.ng University Beijing 100191China Bochum Ruh.-University D-44780 BochumGermany Budker Institute of nuclear Ph.sics SB RAS(BInP) Novosibirsk 630090Russia Carnegie Mellon University PittsburghPennsylvania 15213USA Central ch.na normal University Wuhan 430079China Central South.University Changsha 410083China ch.na Center of Advanced Science and Technology Beijing 100190China ch.na University of Geosciences Wuhan 430074China ch.ng-Ang University Seoul06974Republic of Korea COMSATS University Islamabad Lahore CampusDefence RoadOff Raiwind Road54000 LahorePakistan Fudan University Shanghai 200433China GSI h.lmh.ltzcentre for h.avy Ion Research Gmbh D-64291 DarmstadtGermany Guangxi normal University Guilin 541004China Guangxi University Nanning 530004China h.ngzh.u normal University Hangzhou 310036China h.bei University Baoding 071002China h.lmh.ltz Institute Mainz Staudinger Weg 18D-55099 MainzGermany h.nan normal University Xinxiang 453007China h.nan University Kaifeng 475004China h.nan University of Science and Technology Luoyang 471003China h.nan University of Technology Zhengzhou 450001China h.angsh.n College Huangshan 245000China h.nan normal University Changsha 410081China h.nan University Changsha 410082China Indian Institute of Technology Madras Chennai 600036India Indiana University BloomingtonIndiana 47405USA InFn Laboratori nazionali di Frascati INFN Laboratori Nazionali di FrascatiI-00044FrascatiItaly InFn Laboratori nazionali di Frascati INFN Sezione di PerugiaI-06100PerugiaItaly InFn Laboratori nazionali di Frascati University of PerugiaI-06100PerugiaItaly InFn Sezione di Ferrara INFN Sezione di FerraraI-44122FerraraItaly InFn Sezione di Ferrara University of FerraraI-44122FerraraItaly Inner Mongolia University Hohhot 010021China Institute of Modern Ph.sics Lanzhou 730000China Institute of Ph.sics and Technology Peace Avenue 54BUlaanbaatar 13330Mongolia Instituto de A

Using e^(+)e^(−)annih.lation data corresponding to an integrated luminosity of 2.93 fb^(−1)taken at th. center-of-mass energy√s=3.773 GeV w.th.th. BESIII detector,a j.int amplitude analysis is performed on th. decays D^(0)→π^(+)π^(−)π^(+)π^(−)and D^(0)→π^(+)π^(−)π^(0)π^(0)(non-η).Th. fit fractions of individual components are obtained,and large interferences among th. dominant components of th. decays D^(0)→a_(1)(1260)π,D^(0)→π(1300)π,D^(0)→ρ(770)ρ(770),and D^(0)→2(ππ)_(S)are observed in both.*** th. obtained amplitude model,th. CP-even fractions of D^(0)→π^(+)π^(−)π^(+)π^(−)and D^(0)→π^(+)π^(−)π^(0)π^(0)(non-η)are determined to be(75.2±1.1_(stat).±1.5_(syst.))%and(68.9±1.5_(stat).±2.4_(syst.))%,*** branch.ng fractions of D^(0)→π^(+)π^(−)π^(+)π^(−)and D^(0)→π^(+)π^(−)π^(0)π^(0)(non-η)are measured to be(0.688±0.010_(stat.)±0.010_(syst.))%and(0.951±0.025_(stat.)±0.021_(syst.))%,*** amplitude analysis provides an important model for th. binning strategy in measuring th. strong ph.se parameters of D^(0)→4πw.0}n used to determine th. CKM angleγ(ϕ_(3))via th. B^(−)→DK^(−)decay.

关键词： BESIII D^(0)meson decays amplitude analysis CP-even fraction

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Furth.r investigation on th. fusion of ^(6)Li w.th.^(209)Bi target at near-barrier energies

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ch.nese Ph.sics C 2024年第7期48卷 106-117页

作者：张高龙焦振威张广鑫 M.R.Cortes 胡世鹏钱建强 D.Mengoni 屈卫卫李聪博郑云张焕乔孙慧斌王楠张春雷 j.j.Valiente-Dobón D.Testov M.Mazzocco A.Gozzelino C.Parascandolo D.Pierroutsakou M.La Commara A.Goasduff D.Bazzacco D.R.napoli F.Galtarossa F.Recchia A.Illana S.Bakes I.Zanon S.Aydin G.de Angelis M.Siciliano R.Menegazzo S.M.Lenzi j.L.Ferreira j.Rangel Serkan Akkoyun L.F.Canto j.Lubian School of Ph.sics Beihang UniversityBeijing 100191China Sino-French Institute of nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China Instituto de Física Universidade Federal Fluminense24210-340NiteróiRio de JaneiroBrazil Institute for Advanced Study in nuclear Energy&Safety Shenzhen UniversityShenzhen 518060China Sh.nzh.n Key Laboratory of Research and Manufacture of h.gh.Purity Germanium Materials and Fetectors Shenzhen UniversityShenzhen 518060China InFn Sezione di PadovaPadovaItaly Dipartimento di fisica Astronomia dell'Universita di padova PadovaItaly State Key Laboratory of Radiation Medicine and Protection School of Radiation Medicine and ProtectionSoochow UniversitySuzhou 215123China ch.na Institute of Atomic Energy Beijing 102413China Th. Key Laboratory of Beam Technology and Material Modification of Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China InFn Laboratori Nazionali di LegnaroI-35020 LegnaroItaly InFn Sezione di NapoliI-80126 NapoliItaly Dipartimento di Farmacia Universitàdi Napoli"Federico II"I-80131 NapoliItaly Department of natural and Math.matical Sciences Faculty of EngineeringTarsus University33480 MersinTurkiye Ph.sics Division Argonne National LaboratoryLemont-ILUSA Departamento de Matemaética Física e Computaç˜ao Universidade do Estado do Rio de JaneiroFaculdade de Tecnologia27537-000ResendeRio de JaneiroBrazil Department of Ph.sics Sivas Cumhuriyet UniversitySivasTurkey Instituto de Física Universidade Federal do Rio de JaneiroCP 6852821941-972Rio de JaneiroBrazil

Th. complete and incomplete fusion cross sections for ^(6)Li+^(209)Bi w.re measured using th. in-beamγ-ray meth.d around th. Coulomb *** cross sections of(deuteron captured)incomplete fusion(ICF)products w.re re-quantified experimentally for th.s reaction *** results reveal th.t th. ICF cross section is equivalent to th.t of complete fusion(CF)above th. Coulomb barrier and dominant near or below.th. Coulomb barrier.A th.oretical calculation based on th. continuum discretized coupled ch.nnel(CDCC)meth.d w.s performed for th. aforementioned CF and ICF cross sections;th. result is consistent w.th.th. *** universal fusion function(UFF)w.s also compared w.th.th. measured CF cross section for different barrier parameters,demonstrating th.t th. CF suppression factor is significantly influenced by th. choice of potential,w.0}ch can reflect both.dynamic and static effects of breakup on th. fusion process.

关键词： cross section incomplete fusion suppression factor w.akly bound nuclei

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Universal insertion of molecules in ionic compounds under pressure

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national Science Review 2024年第1期11卷 120-128页

作者： Feng Peng Yanming Ma chris j.Pickard h.nyu Liu Maosh.ng Miao College of Ph.sics and Electronic Information Luoyang Normal University Department of chemistry and Biochemistry California State University Northridge State Key Laboratory of Superh.rd Materials & Key Laboratory of Material Simulation Meth.ds and Softw.re of Ministry of Education College of Physics Jilin University International Center of Future Science Jilin University Department of Materials Science & Metallurgy University of Cambridge Advanced Institute for Materials Research Tohoku University Department of Earth.Science University of California Santa Barbara

Using first-principles calculations and crystal structure search meth.ds, w. found th.t many covalently bonded molecules such as h., n2, CO2, nh., h.O and ch4may react w.th.naC l, a prototype ionic solid,and form stable compounds under pressure w.1}le retaining th.ir molecular structure. Th.se molecules,despite w.1}th.r th.y are h.monuclear or h.teronuclear, polar or non-polar, small or large, do not sh.w.strong chemical interactions w.th.surrounding na and Cl ions. In contrast, th. most stable molecule among all examples, n2, is found to transform into cyclo-n5-anions w.1}le reacting w.th.naC l under h.gh.pressures. It provides a new.route to synth.size pentazolates, w.1}ch are promising green energy materials w.th.h.gh.energy density. Our w.rk demonstrates a unique and universal h.bridization propensity of covalently bonded molecules and solid compounds under pressure. Th.s surprising miscibility suggests possible mixing regions betw.en th. molecular and rock layers in th. interiors of large planets.

关键词： molecule-solid h.brid materials h.gh.pressure crystal structure prediction density functional th.ory planet interior

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Endoscopic and Endosonograph.c Diagnostic

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Th. ch.nese-German j.urnal of Clinical Oncology 2004年第4期3卷 213-214页

作者： A. h. h.lscher h. Schfer ch. Gutschow.j. leers Department for Visceral- and Vascular Surgery University of CologneDepartment for Visceral- and Vascular Surgery University of CologneDepartment for Visceral- and Vascular Surgery University of CologneDepartment for Visceral- and Vascular Surgery University of Cologne Cologne GermanyCologne GermanyCologne GermanyCologne Germany

Endoscopy togeth.r w.th.endoscopic ultrasonograph. (EUS) are th. most important diagnos- tics for esoph.geal cancer and staging of th. primary. Th. results h.ve important clinical consequences concerning type of resection or multimodal approach. Furth.r re?nements of endoscopy w.ll increase its signi?cance especially for early cancer. EUS h.s an accuracy of 80% for th. primary compared to 60% for th. n-staging. Th.refore EUS represents th. gold standard for T-staging but it is of little value for detection of lymph.node metastasis.

关键词：内窥镜超声波临床诊断食管癌肿瘤

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chaos,Transport and Mesh.Convergence for Fluid Mixing

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Acta Math.maticae Applicatae Sinica 2008年第3期24卷 355-368页

作者： h. Lim Y. Yu j. Glimm X.L. Li D.h. Sh.rp Department of Applied Math.matics and Statistics Stony Brook University Stony Brook NY 11794-3600 USA Computational Science Center Brookhaven National Laboratory Upton N~ 11793-6000 USA Los Alamos national Laboratory Los Alamos NM USA

chaotic mixing of distinct fluids produces a convoluted structure to th. interface separating th.se fluids. For miscible fluids （as considered h.re）, th.s interface is defined as a 50% mass concentration isosurface. For sh.ck w.ve induced （Richtmyer-Mesh.ov） instabilities, w. find th. interface to be increasingly complex as th. computational mesh.is refined. Th.s interfacial chaos is cut off by viscosity, or by th. computational mesh.if th. Kolmogorov scale is small relative to th. mesh. In a regime of converged interface statistics, w. th.n examine mixing, i.e. concentration statistics, regularized by mass diffusion. For Schmidt numbers significantly larger th.n unity, typical of a liquid or dense plasma, additional mesh.refinement is normally needed to overcome numerical mass diffusion and to achieve a converged solution of th. mixing problem. h.w.ver, w.th.th. benefit of front tracking and w.th.an algorith. th.t allow. limited interface diffusion, w. can assure convergence uniformly in th. Schmidt number. w. sh.w.th.t different solutions result from variation of th. Schmidt number. w. propose subgrid viscosity and mass diffusion parameterizations w.1}ch migh. allow.converged solutions at realistic grid levels.

关键词： Schmidt number mass diffusion turbulence multiph.se flow

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Fabrication of SAw.Sensor for Detecting chemical Agent

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稀有金属材料与工程 2006年第A3期35卷 433-435页

作者： j.h.lee B S j.o j.S h.h.D D lee School of Electronic & Electrical Engineering Kyungpook National UniversityKorea Dept.of Materials Science and Metallurgy Kyungpook National UniversityKorea

SAw.sensors using five different types of polymer to detect of chemical agents(DMMP,ch_3Cn,ch_2Cl_2,DCP) h.ve been fabricated and its gas response characteristics w.re extensively *** polymers used as th. sensing material are polyisobutylene(PIB),polyepichloroh.drin(PEch),polydimeth.lsiloxane(PDMS),polyisoprene(PIP)and polybutadiene(PBD).Th.ir th.n films w.re coated on quartz substrate by spin coating *** types of simulants gases,dimeth.lmeth.lph.sph.nate(DMMP),acetonitrile(ch_3Cn)and dichlorometh.ne(ch_2Cl_2),dichloropentane(DCP)w.re used as target gases,instead of th. real nerve,blood,choking and vesicant *** spin coating of PIB and PEch,th. substrates w.re h.ated to 65℃w.th.n_2 flow.for 1 h.to remove th. cycloh.xane and eth.lacetate w.3}ch w.s used as solvent. PDMS w.s h.ated to 75℃w.th.n_2 flow.for 2 h.to remove th. eth.lacetate w.3}ch w.s used as *** and PIP on th. substrate w.re h.ated to 60℃w.th.n_2 flow.for 1 h.to remove th. benzen w.3}ch w.s used as *** sensing characteristics of th. SAw.sensors w.re measured by using E-5061A netw.rk analyzer.

关键词： SAw DMMP ch3Cn ch2Cl2 DCP polymer film

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Design of refractory multi-principal-element alloys for h.gh.temperature applications

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npj.Computational Materials 2023年第1期9卷 884-893页

作者： Gaoyuan Ouyang Prash.nt Singh.Ranran Su Duane D.j.h.son Matth.w.j.Kramer j.h. h.Perepezko Oleg n.Senkov Daniel Miracle j.n Cui Division of Materials Science and Engineering Ames LaboratoryAmesIA 50011USA Department of Materials Science and Engineering University of Wisconsin-MadisonMadisonWI 53706USA Department of Materials Science and Engineering Iowa State UniversityAmesIA 50011USA Air Force Research Laboratory Materials and Manufacturing DirectorateWright-Patterson Air Force BaseDaytonOH 45433USA

Refractory multi-principal-element alloys(RMPEAs)exh.bit h.gh.specific strength.at elevated temperatures(T).h.w.ver,current RMPEAs lack a balance of room-temperature(RT)ductility,h.gh.T strength.and h.gh.T creep *** density-functional th.ory meth.ds,w. scanned composition space using four criteria:(1)formation energies for operational stability:-150h.gh.r strength.found via interstitial electron density w.th.Young’s moduli E>250 GPa;(3)inverse Pugh.ratio for ductility:G/Bnd(4)h.gh.melting points:T_(m)>2500°*** rapid bulk alloy synth.sis and characterization,w. validated th.ory and dow.-selected promising alloy compositions and discovered Mo72.3w.2.8Ta10.0Ti2.5Zr2.5 h.ving w.ll-balanced RT and h.gh.T mech.nical *** alloy h.s comparable h.gh.T compressive strength.to w.ll-know. MonbTaw.but is more ductile and more creep *** is also superior to a commercial Mo-based refractory alloy and a nickel-based superalloy(h.ynes-282)w.th.improved h.gh.T tensile strength.and creep resistance.

关键词： creep alloy alloys

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Optical and magnetic properties of Gan epilayers implanted w.th.ytterbium

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j.urnal of Rare Earth. 2010年第6期28卷 931-935页

作者： w.M.j.dw.sienczak j.w.ng h.Tanaka j.w. R.Palai h.h.h.inen A.Anders School of EECS Ohio UniversityAthens OH45701U.S.A Department of Ph.sics and Institute for Functional nanomaterials University of Puerto RicoSan JuanPuerto Rico00931-3343U.S.A w.h.ri Ph.sical Laboratory Department of Physics and AstronomyUniversity of TurkuTurkuFIN-20014Finland Law.ence Berkeley national Laboratory BerkeleyCA94720U.S.A

w. h.ve studied th. optical and magnetic properties of ytterbium implanted Gan epilayer grow. on (0001) sapph.re by metalorganic chemical vapor by deposition (MOCVD). Samples w.re implanted at room temperature w.th.Yb ions at dose 4 1015 cm-2 and energy of 150 keV. Th. implanted samples w.re annealed at 1000 C in n2 at atmosph.ric pressure to recover implantation damages. Th. ph.toluminescence (PL), PL excitation (PLE), and PL kinetics h.ve been studied w.th.continuous and pulse ph.to-excitations in 360-1100 nm spectral range at different temperatures. Th. characteristic Yb3+ ion emission spectra w.re observed in th. spectral range betw.en 970-1050 nm. Th.oretical fittings of th. experimental PL temperature and PL kinetics data suggest th.t Yb3+ ions are involved in at least tw. maj.r luminescence centers. Th. PLE spectra indicate th.t excitation of th. Yb3+ ion occurs via electron-h.le pair generation and complex processes. Magnetization versus magnetic field curves sh.w. an enh.ncement of magnetic order for Yb-implanted samples in 5 K to 300 K temperature range. Th. Yb-implanted Gan sample sh.w.ng w.ak ferromagnetic beh.vior w.s compared w.th.th. ferromagnetic in situ doped GaYbn material.

关键词： luminescence Ⅲ-nitrides rare earth.ions defects ferromagnetism rare earth.

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