检索结果-南通市图书馆

Chinese Physics Let.ers 2006年第4期23卷 967-970页

作者： R. Afzali A. t. Rezakhani Depart.ent.of Physics Faculty of Science University of Isfahan 81744 Isfahan Iran Inst.t.t. for Scient.fic Int.rchange Villa Gualino Viale Settimio Severo 65 I-10133 Torino Italy Inst.t.t. for Quant.m Informat.on Science University of Calgary Alberta T2N 1N4 Canada

A nano-scale s-wave superconduct.ng grain, coupled t. a normal met.llic cont.ct.t.rough a t.nnelling junct.on, is placed in an ext.rnal magnet.c field. We suppose t.at.effect.of t.is quant.m t.nnelling on t.e Fourier t.ansform of t.e order paramet.r is in t.e form of a small addit.ve correct.on t. t.e BCS order paramet.r. At.t.e first.order approximat.on in t.rms of t.is correct.on t.rm and by using an inst.nt.n met.od, t.e relat.d Green funct.ons （in frequency space） are obt.ined. By est.blishing a self-consist.nt.configurat.on an analyt.c formula for t.e order paramet.r is also found. We also show t.at.a depart.re from superconduct.vit. can be capt.red by t.is formula. t.is change of st.t. is indeed a manifest.t.on of a quant.m t.ansit.on induced by quant.m fluct.at.ons. In t.is sense, t.is is an advant.ge of our simple met.od which, like ot.er more elaborat. met.ods, can det.ct.a quant.m t.ansit.on in t.e st.t. of t.e grain.

关键词： ULt.ASMALL MEt.LLIC GRAINS MAGNEt.C FIELD

X-Ray Diffract.on St.dy of Plasma Exposed and Annealed AlSb Bilayer t.in Film

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plasma Science and t.chnology 2013年第4期15卷 382-385页

作者： t. Abdul KAREEM A. Anu KALIANI PG and Research Depart.ent.of Physics Kongunadu Arts and Science College CoimbatoreTamilnadu 641029 India

Aluminum ant.mony seems t. be a promising semiconduct.ng mat.rial for high t.mperat.re applicat.ons, especially for t.ansist.rs and P-N junct.on diodes. Addit.onally, it.is a highly efficient.solar mat.rial. t.is paper discusses t.e plasma induced bilayer diffusion of A1Sb bilayer t.in films using X-ray diffract.gram. A1Sb bilayer t.in films were prepared on a glass subst.at. by vacuum evaporat.on t.chnique. t.e effect.of plasma exposure t.me and annealing t.mperat.re on t.e micro-st.uct.ral paramet.rs were invest.gat.d. X-ray diffract.on st.dies show t.at.t.e cubic cryst.ls of A1 orient.along t.e （111） plane and t.e hexagonal cryst.ls of Sb orient.along t.e （003） plane. Newly formed cubic cryst.ls of A1Sb are orient.d along t.e （200） plane and t.ey are formed due t. t.e simult.neous growt. of A1 and Sb cryst.ls during plasma exposure.

关键词： Aluminum ant.mony bilayer plasma exposure bilayer mixing

Modeling of numerical simulat.on and experiment.l verificat.on for carburizing-nit.iding quenching process

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2006年第B02期16卷 566-571页

作者： R. MUKAI t. MAt.UMOt. JU Dong-ying t. SUZUKI H. SAIt. Y. It. High-t.ch Research Cent.r Special Researcher Saitama Institute of Technology Fukaya 369-0293 Japan Depart.ent.of Mechanical Engineering Saitama Institute of Technology Fukaya 369-0293 Japan Research Cent.r of High t.chnology Anshan University of Science and Technology Anshan 114044 China Depart.ent.of t.chnology Development Tobuyakin Ltd. Japan

A model considering quant.t.t.ve effect. of diffused carbon and nit.ogen gradient. and kinet.cs of phase t.ansformat.on is present.d t. examine met.llo-t.ermo-mechanical behavior during carburized and nit.ided quenching. Coupled simulat.on of diffusion, phase t.ansformat.on and st.ess/st.ain provides t.e final dist.ibut.on of carbon and nit.ogen cont.nt. as well as residual st.ess and dist.rt.on. Effect. of bot. t.ansformat.on and lat.ice expansion induced by carbon and nit.ogen absorpt.on were int.oduced int. calculat.ng t.e evolut.on of t.e int.rnal st.ess and st.ain. In order t. verify t.e met.od and t.e result., t.e simulat.d dist.ibut.ons of carbon and nit.ogen cont.nt.and residual st.ess/st.ain of a ring model during carburized and nit.ided quenching were compared wit. t.e measured dat..

关键词：金属热处理渗碳渗氮淬火过程数值模拟模型实验验证

Enhanced elect.okinet.c remediat.on of cadmium-cont.minat.d nat.ral clay using organophosphonat.s in comparison wit. EDt.

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2018年第5期26卷 1152-1159页

作者： Yingying Gu Albert.t. Yeung Hongjiang Li Depart.ent.of Environment.l and Safet. Engineering China University of Petroleum (East China) Qingdao 266580 China Depart.ent.of Engineering t.e Universit. of Hong Kong Pokfulam Road Hong Kong China Qingdao Wat.r Group Co. Lt.. Qingdao 266002 China College of Mining Civil Engineering Taiyuan University of Technology Taiyuan 030024 China

Soil cont.minat.on by met.ls is a worldwide environment.l problem. Elect.okinet.c ext.act.on is a promising t.chnology for in-sit. remediat.on of cont.minat.d soils of low hydraulic permeabilit.. However, t.e ext.act.on of met.ls is usually hindered by t.e high buffer capacit. of nat.ral soils. Organophosphonat.s are st.ong met.l chelat.s as et.ylenediaminet.t.aacet.c acid(EDt.) which has been widely st.died in t.e enhancement.of elect.okinet.c remediat.on. In t.is st.dy, bat.h desorpt.on experiment. and bench-scale elect.okinet.c ext.act.on experiment. were carried out.t. st.dy t.e effect.of t.o organophosphonat.s, i.e.,(nit.ilot.imet.ylene)t.iphosphonat.(Nt.P) &(et.ylenedinit.ilo)-t.t.amet.ylenephosphonat.(EDt.P), on t.e ext.act.on of cadmium from a nat.ral clay in comparison wit. EDt.. Result. of t.e bat.h desorpt.on experiment. showed t.at.more t.an 75% of t.e sorbed cadmium could be dissolved int. solut.on using 0.1 mol·L^(-1) organophosphonat.s or EDt. in t.e wide p H range of 1–11. Result. of t.e elect.okinet.c ext.act.on experiment. showed t.at.t.e cadmium spiked in t.e specimen migrat.d t.wards t.e anode wit. t.e enhancement.of Nt.P,EDt.P, and EDt. under a const.nt.volt.ge gradient.of approximat.ly 1.0 V·cm-1. Alt.ough cadmium mobilizat.on enhanced by EDt. was more efficient.t.an t.at.by t.e organophosphonat.s, accumulat.on of cadmium was observed in t.e vicinit. of t.e anode. t.e average removal efficiencies of cadmium from t.e soil aft.r approximat.ly 5 days of elect.okinet.c ext.act.on enhanced by 0.1 mol·L-1 Nt.P(22.8%) and EDt.P(22.4%) were higher t.an t.at.by 0.1 mol·L^(-1) EDt.(15.1%).

关键词： Elect.ochemist.y Remediat.on Desorpt.on Organophosphonat. EDt. High buffer capacit.

Comprehension of funct.onal support.by encult.rat.d chimpanzees Pan t.oglodyt.s

在线全文

学校读者我要写书评

暂无评论

Current.Zoology 2011年第4期57卷 429-440页

作者： Anna M. YOCOM Sarah t. BOYSEN Depart.ent.of Psychology The Ohio State University Columbus OH 43210 USA

St.dies of causal underst.nding of t.ol relat.onships in capt.ve chimpanzees have yielded disparat. findings, part.cularly t.ose report.d by Povinelli ＆ colleagues （2000） for t.ol t.sks by laborat.ry chimpanzees. t.e present.set.of experiment. t.st.d nine encult.rat.d chimpanzees on t.ree versions of a support.t.sk, as described by Povinelli （2000）, during which food re- wards were present.d in different.experiment.l configurat.ons. In Experiment.1, st.mulus pairs included a choice bet.een a clot. wit. a reward on t.e upper right.comer or wit. a second reward off t.e clot., adjacent.t. a comer, wit. t.e second pair comprised of a clot. wit. food on t.e upper right.comer, and a second clot. wit. t.e reward on t.e subst.at., part.ally covered. All subject. were successful wit. bot. t.st.condit.ons in Experiment.1. In a second st.dy, t.e experiment.l choices included one of t.o possi- ble correct.opt.ons, paired wit. one of t.ree incorrect.opt.ons, wit. t.e t.ree incorrect.choices all involving varying degrees of percept.al cont.inment. All nine chimpanzees scored significant.y above chance across all six condit.ons. In Experiment.3, four unique condit.ons were present.d, combining one of t.o possible correct.choices wit. one of t.o incorrect.choices. Six of t.e subject. scored significant.y above chance across t.e four condit.ons, and group performance on individual condit.ons was also significant. Superior performance was demonst.at.d by female subject. in Experiment.3, similar t. sex differences in t.ol use previously report.d for wild chimpanzees and some t.ol t.sks in capt.ve chimpanzees. t.e present.result. for Experiment. 2 ＆ 3 were significant.y differed from t.ose report.d by Povinelli et.al. （2000） for laborat.ry-born, peer-reared chimpanzees. One cont.ibut.on t.wards t.e dramat.c differences bet.een t.e t.o st.dy populat.ons may be t.e significant.rearing and housing differences of t.e chimpanzee groups. One explanat.on is t.at.under condit.ons of encult.rat

关键词： Chimpanzees Comparat.ve cognit.on t.ol use Causalit.

Reliable energy-efficient.rout.ng wit. novel rout. updat. in wireless sensor net.orks

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang Universit.-Science A(Applied Physics & Engineering) 2008年第8期9卷 1099-1110页

作者： R. VIDHYAPRIYA P. t. VANAt.I Depart.ent.of Informat.on t.chnology PSG College of TechnologyCoimbatore 641004 India Depart.ent.of Elect.onics and Communicat.on Engineering PSG College of TechnologyCoimbatore 641004 India

In t.is paper we int.oduce a novel energy-aware rout.ng prot.col REPU (reliable, efficient.wit. pat. updat.), which provides reliabilit. and energy efficiency in dat. delivery. REPU ut.lizes t.e residual energy available in t.e nodes and t.e re-ceived signal st.engt. of t.e nodes t. ident.fy t.e best.possible rout. t. t.e dest.nat.on. Reliabilit. is achieved by select.ng a number of int.rmediat. nodes as waypoint. and t.e rout. is divided int. smaller segment. by t.e waypoint.. One dist.nct.ad-vant.ge of t.is model is t.at.when a node on t.e rout. moves out.or fails, inst.ad of discarding t.e whole original rout., only t.e t.o waypoint.nodes of t.e broken segment.are used t. find a new pat.. REPU out.erforms t.adit.onal schemes by est.blishing an energy-efficient.pat. and also t.kes care of efficient.rout. maint.nance. Simulat.on result. show t.at.t.is rout.ng scheme achieves much higher performance t.an t.e classical rout.ng prot.cols, even in t.e presence of high node densit., and overcomes simul-t.neous packet.forwarding.

关键词： Wireless sensor net.orks (WSNs) Rout.ng Energy efficiency Received signal st.engt. indicat.r (RSSI) Rout. repair Waypoint

St.dies of mult.layer st.uct.re in dept. direct.on by soft.X-ray spect.oscopy

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and t.chniques 2006年第5期17卷 257-267页

作者： M. WAt.NABE t. EJIMA N. MIYAt. t. IMAZONO M. YANAGIHARA Shanghai Dianji Universit. Inst.t.t. of Composit. Mat.rials Shanghai Jiaotong University Shanghai 200030 China Saga Universit. Synchrot.on Light.Applicat.on Cent.r Japan Inst.t.t. of Mult.disciplinary Research for Advanced Mat.rials Tohoku University Japan Inst.t.t. of Mult.disciplinary Research for Advanced Mat.rials Tohoku University

It.is demonst.at.d t.at.t.o kinds of soft.X-ray spect.oscopy are useful as nondest.uct.ve met.ods t. in- vest.gat. mult.layer st.uct.res modified by int.rdiffusion or by chemical react.on of adjoining layers in dept. direc- t.on. One is t.e t.t.l elect.on yield (t.Y) spect.oscopy involving angular dependence measurement. Using t.is met.od, it.was found t.at.in LiF/Si/LiF t.ilayers, t.e Si layers exhibit.d a charact.rist.c similar t. porous Si, and in CaF2/Si/CaF2 t.ilayers, it.was found t.at.CaF2 segregat.d t.rough t.e Si layer. Moreover, it.has been shown t.at.t.e t.ickness of t.e t.p layer of a Mo/Si X-ray mult.layer can be det.rmined by analyzing t.Y signals generat.d by t.e st.nding wave. t.e ot.er is t.e soft.X-ray emission spect.oscopy involving spect.al shape analysis. Using t.is met.od, it.was found t.at.in Mo/Si X-ray mult.layers, t.e int.rdiffusion or chemical react.on giving rise t. det.riorat.on of re- flect.nce charact.r occurs in as-deposit.d samples as well as in heat.d samples. In ant.ferromagnet.c Fe/Si mult.lay- ers, it.was confirmed t.at.t.ere was no exist.nce of pure Si layers, but.insulat.ng FeSi2 layers were present. t.is result.suggest. t.at.t.e source of ant.ferromagnet.c coupling is not.conduct.on elect.ons but.quant.m wave int.rference.

关键词：软X射线能谱多层结构景深方向总电子流量驻波硅化合物

A comprehensive review of significant.researches on cont.nt. based indexing and ret.ieval of visual informat.on

在线全文

学校读者我要写书评

暂无评论

Front.ers of Comput.r Science 2013年第5期7卷 782-799页

作者： R. PRIYA t. N. SHANMUGAM Depart.ent.of Mat.emat.cs Anna University-Chennai Chennai 600 025 India

Development. in mult.media t.chnologies have paved way for t.e st.rage of huge collect.ons of video doc- ument. on comput.r syst.ms. It.is essent.al t. design t.ols for cont.nt.based access t. t.e document., so as t. allow an efficient.exploit.t.on of t.ese collect.ons. Cont.nt.based anal- ysis provides a flexible and powerful way t. access video dat. when compared wit. t.e ot.er t.adit.onal video analysis t.ch- niques. t.e area of cont.nt.based video indexing and ret.ieval （CBVIR）, focusing on aut.mat.ng t.e indexing, ret.ieval and management.of video, has at.ract.d ext.nsive research in t.e last.decade. CBVIR is a lively area of research wit. endur- ing acknowledgment. from several domains. Herein a vit.l assessment.of cont.mporary researches associat.d wit. t.e cont.nt.based indexing and ret.ieval of visual informat.on. In t.is paper, we present.an ext.nsive review of significant.researches on CBV1R. Concise descript.on of cont.nt.based video analysis along wit. t.e t.chniques associat.d wit. t.e cont.nt.based video indexing and ret.ieval is present.d.

关键词： nult.media informat.on cont.nt.based video ret.ieval (CBVR) cont.nt.based video indexing and ret.ieval (CBVIR) shot.segment.t.on object.segment.t.on feat.re ext.act.on indexing mot.on est.mat.on querying key frame ret.ieval and indexing.

Anat.my of a eust.t.c event.during t.e t.ronian (Lat. Cret.ceous) hot.greenhouse climat.

在线全文

学校读者我要写书评

暂无评论

Science China Eart. Sciences 2017年第1期60卷 20-29页

作者： Bilal U. HAQ Brian t. HUBER Depart.ent.of Paleobiology MRC-121Smithsonian InstitutionWashington D C 20013USA Sorbonne ISTEP Pierre&Marie Curie UniversityParis 75005France

Sequence st.at.graphic st.dies consider relat.ve change in sea level(as regulat.d by eust.sy,local t.ct.nics and sediment.supply)as t.e main builder of t.e st.at.graphic *** has generally been considered as a consequence of t.e growt. and decay of cont.nent.l ice sheet. t.at.would explain large,rapid changes in sea level,even during periods of relat.ve global climat.c ***,such a mechanism has become increasingly difficult.t. envision during t.mes of ext.eme global warmt. such as t.e t.ronian,when t.e equat.r-t.-pole t.mperat.re gradient.was very low and t.e presence of polar ice seems *** paper invest.gat.s t.e t.ming and ext.nt.of sea level falls during t.e lat. Cenomanian t.rough t.ronian,especially t.e largest.of t.ose event.,sequence boundary Kt.4,which occurred during t.e middle t. lat. t.ronian peak of t.e Cret.ceous hot.greenhouse *** conclude t.at.t.e amplit.de of t.e widespread t.ird-order sea level fall in t.e middle t.ronian t.at.is cent.red at.91.8 Ma varies at.different.locat.ons depending on t.e influence of dynamic t.pography on local t.ct.nics and regional climat.c *** volume variat.ons seem unlikely as a mechanism for cont.olling sea level at.t.is ***,t.is causal fact.r cannot.be ruled out.complet.ly since Ant.rct.c highlands(if t.ey exist.d in t.e Lat. Cret.ceous)could sequest.r enough wat.r as ice t. cause eust.t.c *** ascert.in t.is requires det.iled t.mographic imaging of Ant.rct.ca,followed by geodynamic modeling,t. det.rmine whet.er high plat.aus could have exist.d t. accumulat. ephemeral ice *** mechanisms for sea level change,such as t.ansference bet.een ground wat.r(a small amplit.de short.r t.me scale effect.and t.e ocean and ent.ainment.and release of wat.r from t.e mant.e t. t.e oceanic reservoir(a pot.nt.ally large amplit.de and longer t.me scale process),are int.iguing and need t. be explored furt.er t. prove t.eir efficacy at.t.ird-order t.me scales.

关键词： Eust.t.c event t.ronian Hot.greenhouse climat.

t.e effect. of gonadal hormones on learning and memory in male mammals： A review

在线全文

学校读者我要写书评

暂无评论

Current.Zoology 2011年第4期57卷 543-558页

作者： St.art.t. LEONARD Pet.r J. WINSAUER Depart.ent.of Pharmacology and Experiment.l t.erapeut.cs Louisiana State University Health Sciences Center 1901 Perdido Street New Orleans LA 70112-1393

t.e primary role of t.e gonadal st.roid hormones in mammals is t. regulat. reproduct.on and relat.d behaviors; however, bot. androgens and est.ogens are also int.grally involved in mediat.ng higher brain funct.on and processes including cognit.on, neural development. and neural plast.cit.. In part.cular, a number of st.dies show t.at.est.adiol modulat.s dendrit.c spine growt. and synapse densit. （synapt.c plast.cit.） in t.e hippocampus of females, and t.at.increased est.adiol levels are generally associat.d wit. improvement. on a variet. of learning and memory t.sks. While t.e majorit. of research has focused on t.e beneficial effect. of est.adiol in females, much less at.ent.on has been given t. t.st.st.rone and it. effect. on learning and memory in males. Similar t. est.adiol t.t.rs in females, t.st.st.rone t.t.rs in males decline wit. age, albeit.more gradually, and t.is decline has been correlat.d wit. impairment.of cert.in cognit.ve t.sks. Moreover, st.dies involving bot. humans and animals indicat. t.at.t.st.st.rone and it. met.bolit.s can augment.responding on cert.in behavioral t.sks, depending on t.e subject.s current.hormonal st.t., t.e response required, and t.e st.muli involved （e.g., t.ose involving spat.al or nonspat.al st.muli）. While t.e exact.mechanisms by which t.st.st.rone exert. it. effect. on learning and memory are not.fully underst.od, recent.findings suggest.t.at.t.st.st.rone modulat.s learning and memory in males t.rough an int.ract.on wit. t.e cholinergic syst.m. t.e overall object.ve of t.is review is t. discuss st.dies invest.gat.ng t.e role of t.e gonadal hormones in mediat.ng learning and memory processes in male mammals [Current.Zoology 57 （4）： 543-558, 2011].

关键词： t.st.st.rone Learning and memory Cholinergic syst.m Mammals Cognit.on Androgens