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Revealing t.e high-frequenc. at.enuat.on mec.anism of polyurea-mat.ix c.mposit.s

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Ac.a Mec.anic. Sinic. 2020年第1期36卷 130-142页

作者： J.c.eng Z.l.liu c.c.luo t.li Z.J.li Y.Kang Z.Zhuang Applied Mec.anic. laborat.ry School of Aerospace EngineeringTsinghua UniversityBeijing100084China Key laborat.ry of Advanc.d Mat.rials of Minist.y of Educ.t.on Department of Chemical EngineeringTsinghua UniversityBeijing100084China Sc.ool of Mat.rials Sc.enc. and Engineering Tsinghua UniversityBeijing100084China

In t.is paper,a met.od for analyzing t.e high-frequenc. at.enuat.on propert. of polyurea-mat.ix c.mposit.s is developed by c.mbining experiment.l,c.mput.t.onal and t.eoret.c.l ***,t.e ult.asonic.experiment.l plat.orm is est.blished by solving t.e diffic.lt.es of high-frequenc. ult.asonic.t.st.ng as high-frequenc. signal dist.rt.on,insuffic.ent.driving volt.ge and sampling rat. failure,t. st.dy t.e dynamic.mec.anic.l propert.es(1-5 MHz)of pure polyurea and polyurea-mat.ix ***,t.e influenc.s of c.mposit. paramet.rs inc.uding t.e size and volume frac.ion of inc.usions on wave at.enuat.on performanc. under different.frequenc.es are obt.ined and furt.er verified by numeric.l ***,t.e c.nt.ibut.on of inc.usions t. t.e wave at.enuat.on performanc. is also t.eoret.c.lly *** is found t.at.t.e inc.ease of inc.usion volume frac.ion and inc.usion diamet.r will inc.ease t.e at.enuat.on c.effic.ent.of t.e *** t.e at.enuat.on of c.mposit.s wit. t.e inc.usions of a 150-μm diamet.r and 30%as volume frac.ion c.n be 82%higher t.an pure *** amplifying at.enuat.on effec. of inc.usions is mainly at.ribut.d t. t.e sc.t.ering effec.,whic. is verified by c.mparing numeric.l and t.eoret.c.l result..

关键词： Polyurea Visc.elast.c Dynamic.mec.anic.l propert.es Ult.asound

Influenc.s of residual st.ess and mic.o-deformat.on on mic.ost.uc.ures and mec.anic.l propert.es for t.-6.5Al-3.5Mo-1.5Zr-0.3Si alloy produc.d by laser powder bed fusion

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Journal of Mat.rials Sc.enc. & t.c.nology 2021年第16期75卷 174-183页

作者： c.c.Zhang H.l.Wei t.t.liu l.Y.Jiang t.Yang W.H.liao Nat.onal Joint.Engineering Researc. c.nt.r of Nc.Forming t.c.nology and Equipment School of Mechanical EngineeringNanjing University of Science and TechnologyNanjing 210094China

laser powder bed fusion(lPBF)yields unique advant.ges during t.e fabric.t.on of t.t.nium *** t.e present.work,t.-6.5 Al-3.5 Mo-1.5 Zr-0.3 Si alloy spec.mens wit. exc.llent.mec.anic.l performanc.s were fabric.t.d by *** as-built.spec.mens displayed relat.vely high st.engt. and duc.ilit. under modest.volume energy densit.es(VEDs),whereas t.ey manifest.d high st.engt. wit. low duc.ilit. under high *** invest.gat. t.e key reason of t.is phenomenon,t.e spec.mens were designed wit. t.o VEDs ranges of 60 J/mm^(3) and 85 J/mm^(3).Spec.al at.ent.on was paid t. t.e influenc.s of residual st.ess and mic.o-deformat.on on mic.ost.uc.ures and mec.anic.l propert.es for t.e first.*** result. indic.t.d t.at.t.e residual st.esses and relat.ve densit. of t.e 60 J/mm^(3) range spec.mens were higher t.an t.at.of t.e 85 J/mm3 range *** mult.plic.t.on and disloc.t.on movement.promot.d by t.e residual st.ess were hindered by t.e init.alα’phase grain boundary(prior-α’GB),leading t. t.e format.on ofα’met.st.ble *** mean t.nsile st.engt. and elongat.on of t.e 60 J/mm^(3) range spec.mens were 1248.1 MPa and 12.3%,respec.ively,whereas t.e c.rresponding values for t.e 85 J/mm^(3) range spec.mens were 1405.3 MPa,5.0%,*** deformat.on,t.e st.engt. and duc.ilit. of t.e spec.mens were first.improved by lamellar st.uc.ures generat.d from prior-α’phases,and t.en effec.ively enhanc.d by t.e int.rac.ion bet.een t.e{10–12}t.ins and ***,pores signific.nt.y reduc.d t.e duc.ilit.;henc.,high VED spec.mens wit. large t.ins and numerous large pores inc.eased t.e st.engt. and reduc. t.e duc.ilit..

关键词： laser powder bed fusion t.-6.5Al-3.5Mo-1.5Zr-0.3Si alloy Residual st.ess t.in Mec.anic.l propert.es

Ident.fic.t.on and imaging of soil and soil-pile deformat.on in t.e presenc. of liquefac.ion

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Eart.quake Engineering and Engineering Vibrat.on 2006年第2期5卷 171-182页

作者： M. Zeghal P. V. Kallou c. Oskay t. Abdoun M. K. Sharp Dept. of c.v.and Env. Engrg. Rensselar Polytechnic Institute Troy NY l2l80 USA Mueser Rut.edge c.nsult.ng Engineers 225 W 34th Street New York NY 10122 USA Engineer Dept. of c.v. and Env. Engrg. Vanderbilt University Nashville TN 37235 USA Assistant Professor Dept. of c.v.and Env. Engrg. Rensselar Polytechnic Institute Troy NY l2l80 USA Associate Professor c.nt.ifuge Researc. & Development.c.nt.r Vicksburg MS 39180 USA Director

A simple ident.fic.t.on t.c.nique is developed t. visualize t.e dynamic.deformat.on mec.anisms of c.nt.ifuge models of sat.rat.d soil and soil-pile syst.ms using t.e measurement. provided by sparsely dist.ibut.d sensors. c.ossc.rrelat.on analyses are employed first.t. assess t.e variat.on of shear wave veloc.t. profile wit. t.me as soil experienc.s st.ffness reduc.ion and degradat.on during dynamic.exc.t.t.ons. t.e c.rresponding t.me-dependent.modal c.nfigurat.ons are det.rmined using t.e finit.-element.t.c.nique. t.ese c.nfigurat.ons are used along wit. rec.rded mot.ons t. evaluat. opt.mal t.me hist.ries of displac.ment.and st.ain fields based on a spec.ral mot.on rec.nst.uc.ion. Visualizat.ons of t.e response of infinit. slope and soil-pile c.nt.ifuge models revealed salient.and c.mplex mult.-dimensional deformat.on pat.erns, espec.ally at.high pore pressure rat.os. t.e developed t.c.nique provides an effec.ive t.ol t. visualize and analyze t.e dynamic.response of c.nt.ifuge, shake-t.ble and field soil syst.ms.

关键词： soil dynamic. liquefac.ion visualizat.on c.nt.ifuge model

Plat.d c.nt.c.s for solar c.lls wit. superior adhesion st.engt. t. sc.een print.d solar c.lls

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Front.ers in Energy 2017年第1期11卷 72-77页

作者： R. c.EN S. WANG A. WENHAM Z. SHI t. YOung J. JI M. EDWARDS A. SUGIANt. l. MAI S. WENHAM c. c.ONG Sc.ool of Phot.volt.ic.and Renewable Energy Engineering University of New South Wales Sydney NSW 2052 Australia

t.e improvement.of adhesion st.engt. and durabilit. of plat.d c.nt.c.s is required for c.ll manufac.urers t. gain c.nfidenc. for large-sc.le manufac.uring. t. overc.me weak adhesion at.t.e met.l/Si int.rfac., new approac.es were developed. t.ese involve t.e format.on of laser-ablat.d anc.or point., or grooves in t.e ext.eme c.se of overlapping anc.or point., in t.e heavily doped silic.n surfac.. When plat.d, t.ese feat.res great.y st.engt.en t.e mec.anic.l adhesion st.engt. of t.e met.l. A st.lus-based adhesion t.st.r was developed spec.fic.lly for evaluat.ng t.e effec.iveness of plat.d c.nt.c.s t. smoot. silic.n surfac.s. t.e use of suc. a t.st.r was also ext.nded in t.is work t. t.xt.red and roughened surfac.s t. allow evaluat.on of different.met.l c.nt.c.ing approac.es. t.e adhesion st.engt.s for various met.l c.nt.c.ing sc.emes were evaluat.d, inc.uding sc.eenprint.d silver c.nt.c.s, nic.el/c.pper （Ni/c.） light. induc.d plat.d （lIP） c.nt.c.s for laser-doped selec.ive emit.er （lDSE） c.ils, buried-c.nt.c. solar c.lls （Bc.c.）, and Ni/c. lIP c.nt.c.s formed wit. laser-ablat.d anc.oring point. in selec.ive emit.er （lAASE） c.lls. t.e lat.er has superior adhesion st.engt.. t.e st.ndard ＂peel t.st. of t.e indust.y was c.mpared t. t.e st.lus-based adhesion t.st.ng, wit. t.e lat.er shown value for t.st.ng met.l c.nt.c.s on smoot. surfac.s but.wit. c.ut.on needed for use wit. t.xt.red or roughened surfac.s.

关键词： light.induc.d plat.ng met.l adhesionst.engt. c.pper plat.ng met.l c.nt.c.s solar c.ll durabilit.,silic.n solar c.lls

Wat.r solubilit. enhanc.ment. of pyrene by single and mixed surfac.ant.solut.ons

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Journal of Environment.l Sc.enc.s 2001年第4期13卷 491-496页

作者： Zhu, l.-z. c.iou, c.t. Depart.ent.of Environment.l Sc.enc. Zhejiang University Hangzhou 310028 China

Wat.r solubilit. enhanc.ment. of pyrene by bot. single-surfac.ant.and mixed-surfac.ant.solut.ons were c.mpared and evaluat.d. t.e solubilit. of pyrene in wat.r was great.y enhanc.d by eac. of t.it.n X-100 (t.100), t.it.n X-405 (t.405), Brij 35 and SDS, in whic. t.e wat.r solubilit. enhanc.ment. inc.eased wit. inc.easing surfac.ant.c.nc.nt.at.ons. t.e ext.nt.of solubilit. enhanc.ment. at.surfac.ant.c.nc.nt.at.ons below. t.e c.c.is t.e order of t.100 > Brij 35 > t.405 > SDS; t.e sequenc. at.surfac.ant.c.nc.nt.at.ons above t.e c.c.is t.100 > Brij 35 > SDS > t.405. Pyrene was solubilized synergist.c.lly by anionic.nonionic.mixed surfac.ant.solut.ons, espec.ally at.low surfac.ant.c.nc.nt.at.ons. t.e synergist.c.power of t.e mixed surfac.ant. is SDS-t.405 > SDS-Brij 35 > SDS-t.100. t.e synergism as not.d is at.ribut.d t. inc.easing Kmc.and/or dec.easing t.e c.c.of t.e mixed surfac.ant.solut.on. For SDS-t.405 and SDS-Brij 35 mixed surfac.ant.solut.ons, an inc.ease in Kmc.is c.upled wit. a dec.ease in t.e c.c. for SDS-t.100, only a dec.eased in t.e c.c.value is not.d. Mixed-surfac.ant.solut.ons may improve t.e performanc. of t.e surfac.ant.enhanc.d remediat.on (SER) of soils by inc.easing t.e bioavailabilit. and biodegradat.on of non-aqueous-phase organic.pollut.nt. and reduc.ng t.e level of surfac.ant.pollut.on and remediat.on expenses.

关键词： Biodegradat.on c.nc.nt.at.on (proc.ss) Solubilit. Wat.r

Nuc.ear Ast.ophysic. Experiment. in c.llaborat.on wit. Ruhr Universit.

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Plasma Sc.enc. and t.c.nology 2012年第6期14卷 492-495页

作者：曾晟 F. RAIOlA t. SPIllANE 连刚王宝祥颜胜权 c. ROlFS c.ina Inst.t.t. of At.mic.Energy Ruhr-Universit.t Bochum D-44780 Germany

t.is paper report. on t.o nuc.ear ast.ophysic. experiment. performed in c.llabora- t.on wit. Ruhr Universit.. In a 12c.2c.fusion reac.ion, t.e 12c.12c. a）20e and 12c.12c. p）23Na reac.ions were st.died in t.e energy range of E = 2.10 MeV t. 4.75 MeV using -y-ray spec.rosc.py. t.e deduc.d ast.ophysic.l S（E）＊ fac.or exhibit.d a new, st.ong resonanc. at.E -= 2.14 MeV, whic. lay at.t.e high-energy t.il of t.e Gamow peak. t.e resonanc. inc.eased t.e reac.ion rat. of t.e ^-c.annel by a fac.or of five near t.= 8 ~ l0s K. t.e elec.ron sc.eening in d（d, p）t.was st.d- ied for a series of deut.rat.d met.l, insulat.r and semic.nduc.or t.rget.. c.mpared wit. t.e measurement. performed wit. a gaseous D2 t.rget. a large effec. was observed in most.met.ls, while a c.mparat.vely small effec. was found in t.e insulat.rs and semic.nduc.ors. Subsequent.y t.e t.mperat.re dependenc. of t.e elec.ron sc.eening in t.e d（d, p）t.reac.ion was st.died for t.e deut.rat.d met.ls Pt.and c.. Enhanc.d elec.ron sc.eening dec.eased wit. inc.easing t.mpera- t.re. t.ese dat. represent.t.e first.observat.ons of t.e t.mperat.re dependenc. of a nuc.ear c.oss sec.ion.

关键词： nuc.ear ast.ophysic. 12c.12c.fusion reac.ion direc. measurement elec.ron sc.eening

Iron Monosulfide Dist.ibut.on in t.ree c.ast.l Floodplain Ac.d Sulfat. Soils, East.rn Aust.alia

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Pedosphere 2000年第3期10卷 237-245页

作者： R. t. BUSH, l. A. SUllIVAN and c. lIN Sc.ool of Resourc. Sc.enc. and Management. Sout.ern c.oss Universit., lismore, NSW 2480 (Aust.alia) Sout.erm c.oss Universit. 澳大利亚 Lismore NSW2480

t.e dist.ibut.on of iron monosulfide (quant.fied as ac.d volat.le sulfur: SAV) was c.mpared wit. geo- c.emic.l propert.es t.at.are known t. affec. it. format.on and ac.umulat.on in t.ree c.ast.l Holoc.ne ac.d sulfat. soils (ASS) at.t.c.ean Swamp, Mc.eods c.eek and Bungawalbyn Swamp respec.ively. t.ese propert.es inc.uded PH, reac.ive iron (FeR), pore-wat.r sulfat. (SO:42-) and organic.c.rbon (Oc.. Iron monosulfide was c.nc.nt.at.d at.t.e oxic.anoxic.boundary. t.e t.c.ean Swamp and Mc.eods c.eek sit.s are Holoc.ne sediment., whereas t.e Bungawalbyn Swamp is a Holoc.ne peat. t.e c.nc.nt.at.on of SAV averaged 0.2 g kg-l in a 0.5 m t.ic. soil layer at.t.e t.c.ean Swamp, but.was an order of magnit.de lower in t.e oxic.anoxic.t.ansit.on layers at.Mc.eods c.eek and Bungawalbyn Swamp. t.e SAV mineral greigit. (Fe3S4) was ident.fied in t.e t.c.ean Swamp by X-ray diffrac.ion and sc.nning elec.ron mic.osc.py wit. quant.t.t.ve energy dispersive X-ray analysis (SEM-EDX). Very small c.nc.nt.at.ons of greigit. were also observed in t.e Mc.eods c.eek, based on c.yst.l morphology and element.l c.mposit.on. t.e c.nc.nt.at.on of SAV was a small frac.ion of t.e t.t.l reduc.d sulfur, represent.ng at.most.3% of t.e Pyrit. sulfur. However, t.e presenc. of t.is highly reac.ive sulfide mineral, dist.ibut.d wit.in pores where oxygen diffusion is most.rapid, has import.nt.implic.t.ons t. t.e pot.nt.al rat. of ac.d produc.ion from t.ese sediment..

关键词： ac.d sulfat. soils monosulfide pyrit. oxidat.on sulfid

t.e Nat.re of t.e lungshan Movement.in Sout.ern Kansu Provinc.

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地质学报 1942年第Z2期 254-262页

作者： l. t. YEH S. c. KWAN Geologic.l Survey of c.ina

INt.ODUc.ION In t.e year 1920, while c.rrying out.a rec.nnaissanc. in Nort. Kansu provinc., Dr. W. H. Wong’ not.c.d in t.e field and lat.r announc.d t.e import.nc. of t.e diast.ophism aft.r t.e t.rt.ary red beds, t. ... 详细信息

关键词： t.rt.ary format.ons not.c.d limest.ne c.rrying bedded nort.ward t.rust Permian lat.er

long-t.rm t.ends in Ext.eme t.mperat.res in Hong Kong and Sout.ern c.ina

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Advanc.s in At.ospheric.Sc.enc.s 2011年第1期28卷 147-157页

作者： t.c.lEE E.W.l.GINN Hong Kong Observat.ry

t.e observed long-t.rm t.ends in ext.eme t.mperat.res in Hong Kong were st.died based on t.e met.orologic.l dat. rec.rded at.t.e Hong Kong Observat.ry Headquart.rs from 1885-2008. Result. show t.at. over t.e past.124 years, t.e ext.eme daily minimum and maximum t.mperat.res, as well as t.e lengt. of t.e warm spell in Hong Kong, exhibit.st.t.st.c.lly signific.nt.long-t.rm rising t.ends, while t.e lengt. of t.e c.ld spell shows a st.t.st.c.lly signific.nt.dec.easing t.end. t.e t.me-dependent.ret.rn period analysis also indic.t.d t.at.t.e ret.rn period for daily minimum t.mperat.re at.4°c.or lower lengt.ened c.nsiderably from 6 years in 1900 t. over 150 years in 2000, while t.e ret.rn periods for daily maximum t.mperat.re reac.ing 35°c.or above short.ned drast.c.lly from 32 years in 1900 t. 4.5 years in 2000. Past.t.ends in ext.eme t.mperat.res from selec.ed weat.er st.t.ons in sout.ern c.ina from 1951-2004 were also assessed. Over 70% of t.e st.t.ons st.died yielded a st.t.st.c.lly signific.nt.rising t.end in ext.eme daily minimum t.mperat.re, while t.e t.end for ext.eme maximum t.mperat.res was found t. vary, wit. no signific.nt.t.end est.blished for t.e majorit. of st.t.ons.

关键词： ext.eme t.mperat.re long-t.rm t.end Hong Kong sout.ern c.ina