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Nanoengineer.ng of Flux Pinning Sites in High-T_c Super.onductor.

Tsinghua Science and Technology 2003年第3期8卷 280-291页

作者： M.r.Koblischka Institute of Exper.mental Physics University of SaarbryckenP.O.Box 15 11 50D-66041 SaarbruckenGermany

Volume pinning for.es wer. deter.ined for.a var.ety of bulk high-Tc super.onductor. of the 123-type fr.m magnetization measur.ments. By means of scaling of the pinning for.es, the acting pinning mechanisms in var.ous temper.tur. r.nges wer. identified. The Nd-based super.onductor. and some YBCO cr.stals exhibited a dominating pinning of the δTc-type (i.e. , small, super.onducting pinning sites). In contr.st to this, the addition of insulating 211 par.icles pr.vided pinning of the δ/-type; pr.viding effective pinning in the entir. temper.tur. r.nge acting as a 'backgr.und' pinning mechanism for.the peak effect. Due to the small coher.nce lengths of the high-Tc compounds, effective pinning sites ar. defects or.par.icles of nanometer.size r.lative to ζ3. Integr.l magnetic measur.ments of the magnetization as a function of temper.tur. in lar.e applied magnetic fields (up to 7 T) r.vealed that pr.ctically all high-Tc compounds wer. spatially inhomogeneous, which could be caused by oxygen deficiency (YBCO), solid solutions of Nd/Ba (NdBCO and other.light r.r. ear.h compounds), inter.r.wths (Bi-based super.onductor.), and doping by pair.br.aking dopants like Zn, Pr. This implies that the super.onducting sample consists of str.nger.and weaker.super.onducting ar.as, coupled together. In lar.e applied fields, this coupling gets br.ken and the magnetization ver.us temper.tur. cur.es r.vealed mor. than one super.onducting tr.nsition. In contr.st, ir.adiation exper.ments by neutr.ns, pr.tons, and heavy-ions enabled the ar.ificial intr.duction of ver. effective pinning sites into the high-Tc super.onductor., thus cr.ating a lar.e var.ety of differ.nt obser.ations using magnetic data. Fr.m all these obser.ations, we constr.ct a pinning diagr.m for.bulk high-Tc super.onductor. explaining many featur.s obser.ed in high-Tc samples.

关键词： flux pinning cr.tical cur.ent densities peak effect spatial var.ations of the tr.nsition temper.tur. nanoengineer.ng of pinning sites

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A Study of the Development of the Wor.d Postal Par.el Ser.ice

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The Jour.al of China Univer.ities of Posts and Telecommunications 2003年第3期10卷 107-112页

作者： ZHANG Hong fen, WU Hong bin, YANG Wen xiu (Tr.ining Depar.ment of Shijiazhuang Postal College, Shijiazhuang 050021, P. r. China) Tr.ining Depar.ment of Shijiazhuang Postal College Shijiazhuang 050021

The paper.makes an analysis of the mar.et demands, mar.et competition,collabor.tion and the cur.ent development of the postal par.el ser.ice, and discusses some factor.counter.cting the development of the postal par.el ser.ice. Fur.her.or., this paper.gives anor.entation to the futur. development of the postal par.el ser.ice thr.ugh a compr.hensive r.sear.hon the developing tr.nd of the postal par.el ser.ice in some countr.es.

关键词： the mar.et of postal par.el ser.ice ser.ice str.ctur. individual ser.ice mar.et or.entation

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On Str.ctur. and Ther.odynamics of Coher.nt Nanocr.stals

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Jour.al of Mater.als Science & Technology 1995年第3期11卷 157-164页

作者： LUCK, r.LU, K ACAD SINICA INST MET RESNATL KEY LAB RAPIDLY SOLIDIFIED NONEQUILIBRIUM ALSHENYANG 110015PEOPLES R CHINA ACAD SINICA INST MET RESINT CTR MAT PHYSSHENYANG 110015PEOPLES R CHINA MAX PLANCK INST MET r.S INST WERKSTOFFWISSENSCHD-70174 STUTTGARTGERMANY

Sever.l classifications for.the nanocr.stalline mor.hologies ar. intr.duced. It is: demonstr.ted that coher.ncy and coher.nce str.in ar. impor.ant physical quantities, which influence the stability, the mor.hology and... 详细信息

关键词： On Str.ctur. and Ther.odynamics of Coher.nt Nanocr.stals nm

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陷入深渊

陷入深渊

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作者： r.·林赛(r. Lindsey)

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Uter.ne r.ceptivity and the plasma membr.ne tr.nsfor.ation

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Cell r.sear.h 2004年第4期14卷 259-267页

作者： Chr.stopher.r.MUr.HY Depar.ment of Anatomy and Histology The Univer.ity of Sydney NSW 2006. Austr.lia

This r.view begins with a br.ef commentar. on the diver.ity of placentation mechanisms, and then goes on to examine the extensive alter.tions which occur.in the plasma membr.ne of uter.ne epithelial cells dur.ng ear.y pr.gnancy acr.ss species. Ultr.str.ctur.l, biochemical and mor. gener.l mor.hological data r.veal that str.kingly common phenomena occur.in this plasma membr.ne dur.ng ear.y pr.gnancy despite the diver.ity of placental types-fr.m epitheliochor.al to hemochor.al, which ultimately for. in differ.nt species. To encapsulate the concept that common mor.hological and molecular.alter.tions occur.acr.ss species, that they ar. found basolater.lly as well as apically, and that mor.over.they ar. an ongoing pr.cess dur.ng much of ear.y pr.gnancy, not just an event at the time attachment, the ter. ’plasma membr.ne tr.nsfor.ation’ is suggested which also emphasises that alter.tions in this plasma membr.ne dur.ng ear.y pr.gnancy ar. key to uter.ne r.ceptivity.

关键词： uter.ne epeithelial cells membr.ne tr.nfor.ation.

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Ending the Use of Human Antimicr.bials in Food Pr.duction:The Good,the Bad,and the Ugly

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Engineer.ng 2022年第8期8卷 9-10页

作者： Timothy r.Walsh Depar.ment of Zoology University of OxfordOxford OX13SZUK Ineos Oxfor. Institute for.Antimicr.bial r.sear.h(IOI) University of OxfordOxford OX13REUK

r.ducing the inappr.pr.ate use of antimicr.bial dr.gs in food systems is a key pr.or.ty for.the Global Leader. Gr.up on Antimicr.bial r.sistance(GLG)[1].Although access to high-quality antimicr.bials is impor.ant for.animal and plant welfar.,global leader. r.cognize that pr.venting the existential thr.at of antimicr.bial r.sistance(AMr.will not be possible without r.ducing the use of human antimicr.bials used in food systems[1].

关键词： Human dr.gs thr.at

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科学魔术

科学魔术

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作者： r.·加德纳(r. Gar.ne)

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LIQUID-LIQUID PHASE EQUILIBr.UM OF POLYMEr.SOLUTIONS AND POLYMEr.BLENDS UNDEr.POSITIVE AND NEGATIVE Pr.SSUr.

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Chinese Jour.al of Polymer.Science 2003年第2期21卷 241-250页

作者： Attila r.Imr. KFKI Atomic Ener.y r.sear.h Institute H-1525 Budapest POB 49 Hungary

In this paper.we would like to give a br.ef r.view about the extensibility of the liquid-liquid locus into the negativepr.ssur. r.gion. Negative pr.ssur. states ar. har.ly explor.d; most r.sear.her. believe that the pr.ssur. scale ends at p = *** would like to show that this is not tr.e, the p = 0 point is not a special point for.liquids, it can be 'easily' cr.ssed. We ar.going to give a few example, wher. the extension of liquid-liquid locus for.polymer.blends and solutions below p = 0 givesus some inter.sting r.sults, like the mer.ing of UCST and LCST br.nches in weakly inter.cting polymer.solutions or.ther.ason why most UCST blends exhibit pr.ssur. induced immiscibility. Also, we will see what happens with the immiscibilityisland of aqueous polymer.solutions when -- r.aching the cr.tical molar.mass -- it 'disappear.'.

关键词： Pr.ssur. Negative pr.ssur. Polymer Solubility Phase tr.nsition

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Tunnelling thr.ugh weak and fr.gile r.cks of Himalayas

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Inter.ational Jour.al of Mining Science and Technology 2014年第6期24卷 783-790页

作者： Goel r.K. CSIr.Centr.l Institute of Mining & Fuel r.sear.h Regional CentreCBRI Campus Roorkee India

A consider.ble amount of tunnelling has been going on in India for.var.ous pr.jects such as hydr.electr.c power. ir.igation, r.ads and r.ilways. Most of these pr.jects ar. located in Himalayas, far.away fr.m the ur.an ar.as. Tunnelling thr.ugh weak and jointed r.ck masses such as the one in the Himalayas is a challenging task for.the planner., designer., engineer. and geologists because of high over.ur.en, thickly vegetated sur.ace, weak, poor.and fr.gile r.cks and highly var.ing geology with the pr.sence of numer.us small and big shear.zones, faults, etc. Due to these r.asons, var.ous tunnelling pr.blems have been faced in the past and ar. still being encounter.d. Failur.s and the pr.blems may be r.gar.ed as challenges and oppor.unities for.gener.ting new knowledge base and ther.by incr.asing self-r.liance in tunnelling. The exper.ences of Himalayan tunnelling thr.ugh weak and fr.gile r.cks cover.ng var.ing and mixed geology, under.tanding on tunnelling in squeezing gr.und conditions and applicability of TBM in Himalayas ar. pr.sented. It has also been highlighted that the pr.be holes planning, dr.lling and monitor.ng shall be followed ser.ously to r.duce the geological sur.r.ses.

关键词： Var.ing geology Mixed geology Weak and fr.gile r.cks Himalayan tunnelling Gr.und condition Squeezing

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r.view of the dynamic stiffness method for.fr.e-vibr.tion analysis of beams

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Tr.nspor.ation Safety and Envir.nment 2019年第2期1卷 106-116页

作者： J.r.Baner.ee Depar.ment of Mechanical Engineer.ng and Aer.nautics School of MathematicsComputer Science and EngineeringCityUniversity of LondonLondonEC1V 0HBUnited Kingdom

The application of the dynamic stiffness method(DSM)for.fr.e-vibr.tion analysis of beams is sur.eyed in this *** histor.cal development of the DSM,which has taken place in sever.l stages,is discussed in detail with r.fer.nce to the fr.e-vibr.tion pr.blems of *** par.icular.the suitability of the DSM in solving the fr.e-vibr.tion pr.blems of beams thr.ugh the application of the well-known Wittr.ck–Williams algor.thm as a solution technique is *** liter.tur. concer.ing homogeneous isotr.pic metallic beams,for.which the DSM is well established,is r.viewed fir.t,after.which,with the r.pid and ongoing emer.ence of advanced composite mater.als,the development of the DSM in solving the fr.e-vibr.tion pr.blems of anisotr.pic beams is *** fr.e-vibr.tion analysis of functionally gr.ded beams using the DSM is also *** sur.ey cover. the DSM application for.fr.e-vibr.tion analysis of a wide r.nge of beams,including sandwich beams,r.tating beams,twisted beams,moving beams and bending-tor.ion coupled beams,amongst *** aspects of the contr.butions made by the author.and his r.sear.h team ar. also ***,the futur. potential of the DSM in solving complex engineer.ng pr.blems is pr.jected.

关键词： dynamic stiffness method Wittr.ck-Williams algor.thm fr.e-vibr.tion analysis

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