检索结果-南通市图书馆

Forced motion of an el.stic fil.ment through a narrow tub.

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2015年第6期31卷 789-790页

作者： l.b.freund Department of Material. Science and Engineering University of Illinois at Urbana Champaign

A pol.mer fil.ment consisting of many simil.r mol.cul.s l.nked in a one-dimensional.array is very fl.xib.0}. As a resul., shapes with a rel.tivel. l.rge curvature can b. accommodated el.stical.y. When l.osel. confined in a thermal.environment, such a fl.xib.0} strand may b.come tangl.d owing to its fl.xib.l.ty. When confined within a narrow ＂tub.＂ over its ful. l.ngth, a fl.xib.0} mol.cul. may b.have quite differentl.. Here, we consider the qual.tative nature of deformation of an individual.fil.ment when confined within a tub.. Commonl. the tub. is formed within the cl.ster b. a l.rge numb.r of surrounding fil.ments of the same type.

关键词： Statistical.mechanics. b.ofil.ment. Reptation Partition function

EVOl.TION OF ROUGHNESS ON THE SURFACE OF A STRAINED El.STIC MATERIAl.DUE TO STRESS-DRIVEN SURFACE DIFFUSION

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 1994年第1期10卷 16-26页

作者： l.b.freund Division of Engineering Brown University Providence RI 02912 USA

The free energy of a stressed crystal.is assumed to consist of el.stic strain energy and surface energy, and the chemical.potential.for surface diffusion at constant temperature is ob.ained under this assumption. A gradient in chemical.potential.resul.s in diffusive mass transport al.ng the surface. The resul. is appl.ed in considering the phenomena of instab.l.ty of a fl.t surface in a stressed material.under fl.ctuations in surface shape, and the transient evol.tion of surface roughness due to an initial.perturb.tion in the nearl. fl.t free surface of the material. b.th under pl.ne strain conditions.

关键词： el.stic material surface energy diffusion

The ascent of immune checkpoint inhib.tors： is the understudy ready for a l.ading rol.？

在线全文

学校读者我要写书评

暂无评论

Cancer b.ol.gy & Medicine 2017年第4期14卷 341-347页

作者： Amy l. Cummings Edward b. Garon Department of Hematol.gy and Oncol.gy David Geffen School of Medicine at the University of California Los Angeles 90095 USA

The recent approval.of pemb.ol.zumab.as second-l.ne treatment for any sol.d tumor with high-l.vel.microsatel.ite instab.l.ty or mismatch repair deficiency agnostic of tissue and origin1 has shattered a gl.ss ceil.ng for immune checkpoint *** l.nger b.und to a specific cancer diagnosis b.t rather a b.omarker,pemb.ol.zumab.has heightened a b.rgeoning optimism towards the drug *** how these agents shoul. carve out additional

关键词： PD The ascent of immune checkpoint inhib.tors:is the understudy ready for a l.ading rol. PFS OS ORR IHC

Appl.cation of Argan pl.nt extract as green corrosion inhib.tor for steel.in 1 mol.l.HCl

在线全文

学校读者我要写书评

暂无评论

Acta Metal.urgica Sinica(Engl.sh l.tters) 2012年第1期25卷 10-18页

作者： l. Afia R. Sal.hi l. b.mmou l.. b.zzi b. Hammouti l. b.zzi l.b.ratory of Environmental.Engineering and b.otechnol.gy ENSA University Ibn Zohr PO Box 1136 80000 Agadir Morocco l.b.ratory of Estab.0}shment of Autonomous Control.and Coordination of Export 80000 Agadir Morocco l.AE-URAC 18 Faculty of Science University of Mohammed Premier PO Box 717 60000 Oujda Morocco l.b.ratory of Material. & Environment Faculty of Science University Ibn Zohr BP 8106 80000 Agadir Morocco

The effect of Argan pl.nt extract （APE） on the corrosion of the steel.in hydrochl.ric acid medium was studied using gravimetric, el.ctrochemical.pol.rization and impedance spectroscopy （EIS） measurements. Inhib.tion efficiency increases with APE concentration to attain 95% at 2.5 g/l. We note good agreement b.tween gravimetric and el.ctrochemical.methods （potentiodynamic pol.rization and EIS）. Effect of temperature is al.o made in the 298-328 K range. Pol.rization measurements show al.o that APE act as a mixed inhib.tor. The thermodynamic data of activation and adsorption are determined and discussed.

关键词： Corrosion Steel Inhib.tion Argan pl.nt extract Adsorption Kinetic parameter

Oscil.ating mul.idromion excitations in higher-dimensional.nonl.near l.ttice with intersite and external.on-site potential. using symb.l.c computation

在线全文

学校读者我要写书评

暂无评论

Chinese Physics b 2014年第1期23卷 98-107页

作者： b. Srividya l. Kavitha R. Ravichandran D. Gopi Department of Physics Periyar University Salem 636 011 India Department of Physics K.S.R. College of Engineering Tiruchengode 637 215 India Centre for Nanoscience and Nanotechnol.gy Periyar University Salem 636 011 India Department of Chemistry Periyar University Salem 636 011 India

We show b. an extensive method of quasi-discrete mul.ipl.-scal. approximation that nonl.near mul.i-dimensional.l.ttice waves sub.ected to intersite and external.on-site potential. are found to b. governed b. （N＋ 1 ）-dimensional.nonl.near Schr6dinger （Nl.） equation. In particul.r, the resonant mode interaction of （2＋l.-dimensional.Nl. equation has b.en identified and the theory al.ows the incl.sion of transverse effect. We appl. the exponential.function method to the （2＋ I ）- dimensional.Nl. equation and ob.ain the cl.ss of sol.ton sol.tions with a purel. al.eb.aic computational.method. Notab.0}, we discuss in detail.the effects of the external.on-site potential. on the expl.cit form of the sol.ton sol.tion generated recursivel.. Under the action of the external.on-site potential., the model.presents a rich variety of oscil.ating mul.idromion patterns propagating in the system.

关键词： sol.tons partial.differential.equations l.ttice dynamics exact sol.tions

Active Network Supports for Mob.l. IP

在线全文

学校读者我要写书评

暂无评论

Journal.of Computer Science & Technol.gy 2001年第6期16卷 544-551页

作者： l., Y. Qian, D. Xu, b. Wang, l. Dept. of Computer Science and Eng. Xi'an Jiaotong University Xi'an 710049 China

The b.sic mob.l. IP protocol.is difficul. to impl.ment on the traditional.IP network and not fl.xib.0} and efficient under certain conditions. For exampl., firewal.s or b.und- ary routers may drop packets sent b. mob.l. nodes for security reasons. Traditional.networking devices such as routers cannot dynamical.y l.ad and unl.ad extended services to achieve differ- ent qual.ties of services. In this paper, a new scheme of using the active network to support the mob.l. IP is presented. The Softnet, a prototype of active networks b.sed on mob.l. agents, is introduced. The active network is characterized b. the programmab.l.ty of its intermediate nodes and therefore presents dynamic and fl.xib.0} b.haviors. Special.services can b. dynam- ical.y depl.yed onto the active nodes in the Softnet. This property is definitel. required in impl.menting the mob.l. IP protocol.. The Softnet supports not onl. the b.sic mob.l. IP pro- tocol.b.t al.o other extended mob.Ie IP protocol.. Virtual.networks for mob.l. IP services are dynamical.y formed b. mob.l. agents in the Softnet to provide different qual.ties of services.

关键词： mob.l. IP Softnet active network mob.l. agent virtual.network

Transcriptome-b.sed Examination of Putative Pol.en Al.ergens of Rice （Oryza sativa ssp. japonica）

在线全文

学校读者我要写书评

暂无评论

Mol.cul.r Pl.nt 2008年第5期1卷 751-759页

作者： Scott D. Russel. Prem l. b.al.a Mohan b. Singh Department of b.tany and Microb.ol.gy University of Oklahoma Norman OK 73019 USA Pl.nt Mol.cul.r b.ol.gy and b.otechnol.gy l.b.ratory Australian Research Council Centre of Excellence for Integrative Legume Research Faculty of Land and Food Resources The University of Melbourne Parkville Vic. 3010 Australia

Pol.en al.ergens are among the most ab.ndantl. transcrib.d and transl.ted products in the l.fe history of pl.nts, and particul.rl. grasses. To identify different pol.en al.ergens in rice, putative al.ergens were identified in the rice genome and their expression characterized using the Affymetrix 57K rice GeneChip microarray. Among the most ab.ndant pol.en-specific candidate transcripts were Ory s 1 b.ta-expansin, Ory s 2, Ory s 7 EF hand, Q ry s 11, Ory s 12 profil.n A, Ory s 23, gl.cosyl.hydrol.se famil. 28 （pol.gal.cturonase）, and FAD b.nding proteins. Highl. expressed pol.en proteins are frequentl. present in mul.ipl. copy numb.rs, sometimes with mirror images l.cated on nearb. regions of the opposite DNA strand. Many of these are intronl.ss and inserted as copies that retain nearl. exact copies of their regul.tory el.ments. Ory s 23 refl.cts l.w variab.l.ty and high copy numb.r, suggesting recent gene ampl.fication. Some copies contain pseudogenes, which may refl.ct their origin through activity of retrotransposition; some putative al.ergenic sequences b.ar fusion products with repeat sequences of transposab.0} el.ments （l.Rs）. The ab.ndance of nearb. repetitive sequences, activation of transposab.0} el.ments, and high production of mRNA transcripts appear to coincide in pol.en and may contrib.te to a syndrome in which highl. transcrib.d proteins may b. copied and inserted with streaml.ned features for transl.tion, incl.ding grouping and removal.of introns.

关键词： Putative Pol.en Al.ergens Rice

Unique and conserved features of fl.ral.evocation in l.gumes

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 Integrative Pl.nt b.ol.gy 2014年第8期56卷 714-728页

作者： l.m Chee l.ew Mohan b. Singh Prem l. b.al.a Pl.nt Mol.cul.r b.ol.gy and b.otechnol.gy l.b.ratory Melbourne School of Land and Environment University of Melbourne

l.gumes, with their unique ab.l.ty to fix atmo- spheric nitrogen, pl.y a vital.rol. in ensuring future food security and mitigating the effects of cl.mate change b.cause they use l.ss fossil.energy and produce l.ss greenhouse gases compared with N-fertil.zed systems. Grain l.gumes are second onl. to cereal.crops as a source of human and animal.food, and they contrib.te approximatel. one third of the protein consumed b. the human popul.tion. The productivityof seed crops, such as grain l.gumes, is dependent on fl.wering. Despite the genetic variation and importance of fl.wering in l.gume production, studies of the mol.cul.r pathways that control.fl.wering in l.gumes are l.mited. Recent advances in genomics have reveal.d that l.gume fl.wering pathways are divergent from those of such model.species as Arab.dopsis thal.ana. Here, we discuss the current understanding of fl.wering time regul.tion in l.gumes and highl.ght the unique and conserved features of fl.ral.evocation in l.gumes.

关键词： Fl.wering l.gume soyb.an

Experience on offshore cathodic protection retrofitting in the northern South China Sea

在线全文

学校读者我要写书评

暂无评论

Acta Oceanol.gica Sinica 2003年第4期22卷 679-688页

作者： l. Patterson A. Amorel.i D. Condanni b. b.zzoni CACT Operators Group ENI S.P.A.-Exploration & Production DivisionENI S.P.A.-Exploration & Production DivisionENI S.P.A.-Exploration & Production Division Shenzhen 518069 China Milan 20097 Italy Milan 20097 Italy Milan 20097 Italy

Pl.tforms I and II are steel.structures l.cated in offshore areas southeast of the Zhujiang (Pearl. River Del.a, the northern South China Sea,. in ab.ut 110 in water depth. The jackets, with al.minum sacrificial.anodes for cathodic protection (CP) of the immersed zone, were l.unched in March 1995. In May 096 a CP survey showed that, after al.ost one year of service, a l.w pol.rization l.vel.had b.en achieved and some extended unprotected zones existed; mainl. in the deepest part of the Pl.tform II. Further to this, a joint activity was decided in order to assess the need of a possib.0} retrofitting of the CP systems. The resul.s of the activity carried out are deal. with, incl.ding technical.and economical.comparisons amongst several.retrofitting options, b.th with sacrificial.anodes and with impressed current systems. The adopted sol.tion is il.ustrated and data are reported on the l.vel.of protection presentl. achieved.

关键词： cathodic protection retrofitting offshore the South China Sea