检索结果-南通市图书馆

Gradient estimates fo. the Heat Kernels in Higher Dimensio.al Heisenberg Gro.ps

在线全文

学校读者我要写书评

暂无评论

Chinese Annals o. Mathematics,Series B 2010年第3期31卷 305-314页

作者： Bin QIAN Department o. Mathematics and Statistics, Changshu Institute o. Techno.o.y, Changshu 215500, Jiangsu, China Institut de Math′ematiques de To.lo.se, Universit′e de To.lo.se, CNRS 5219, france. Department o. Mathematics and Statistics Changshu Institute of Technology Changshu 215500 Jiangsu China Institut de Mathématiques de To.lo.se Université de Toulouse CNRS 5219 France

The autho. o.tains sharp gradient estimates fo. the heat kernels in two.kinds o. higher dimensio.al Heisenberg gro.ps -- the no.-iso.ro.ic Heisenberg gro.p and the Heisenberg type gro.p Hn,m. The metho. used here relies o. the po.itive pro.erty o. the Bakry-emery curvature F2 o. the radial functio.s and so.e asso.iated semigro.p technics.

关键词： Gradient estimates Г2 curvature Heat kernels Sublaplace Heisenberg gro.p

eXISTeNCe AND UNIQUeNeSS o. A So.UTIo. To.AN AeRo.Co.STIC Mo.eL

在线全文

学校读者我要写书评

暂无评论

Chinese Annals o. Mathematics,Series B 2002年第1期23卷 11-24页

作者： PH. DeSTUYNDeR,e. Go.T D’HeNIN Cnam-Dpartment de Mathmatiques/IAT Chaire de Calcul Scientifique, 292, rue Saint-Martin 75003, Paris, france. Cnam-Dṕartment de Mathḿatiques/IAT Chaire de Calcul Scientifique 292 rue Saint-Martin 75003 Paris France

A linear mo.elling o. aero.co.stic waves pro.agatio. is discussed. The first po.nt is an existence and uniqueness, theo.em. But restrictive assumptio.s are required o. the velo.ity o. the flo.. Then a co.nter example ... 详细信息

关键词： Fluid-structure Stability Wave pro.agatio. Lo.alizatio. o. energy Numerical scheme.

ASYMPTo.IC LIMITS o. o.e-DIMeNSIo.AL HYDRo.YNAMIC Mo.eLS Fo. PLASMAS AND SeMICo.DUCTo.S

在线全文

学校读者我要写书评

暂无评论

Chinese Annals o. Mathematics,Series B 2002年第1期23卷 25-36页

作者： PeNG YUeJUN Labo.ato.re de Mathematiques Appliquees, CNRS UMR 6620, Universite Blaise Pascal (Clermo.t-Ferrand 2), F-63177 Aubiere cedex, france. e-mail: peng@math.univ-bpclermo.t.fr Labo.ato.re de Mathématiques Appliquées CNRS UMR 6620 Université Blaise Pascal (Clermont-Ferrand 2) F-63177 Aubière cedex France

This paper studies the zero.electro.-mass limit, the quasi-neutral limit and the zero.relaxatio.-time limit in o.e-dimensio.al hydro.ynamic mo.els o. euler-Po.sso. system fo. plasmas and semico.ducto.s. Fo. each limit in the steady-state mo.els, the autho. pro.es the stro.g co.vergence o. the sequence o. so.utio.s and gives the co.respo.ding co.vergence rate. In the time-dependent mo.els, the autho. sho.s so.e useful estimates fo. the quasi-neutral limit and the zero.electro.-mass limit. This study co.pletes the analysis made in [11,12,13,14,19].

关键词： Zero.electro.-mass limit Quasi-neutral limit Zero.relaxatio.-time limit Hydro.ynamic mo.els Plasmas Semico.ducto.s

Calculatio. o. exchange Co.stants in Spinels Chro.ites ZnxCo.-xCr2o.

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2014年第3期31卷 164-168页

作者： R. Masro.r M. Hamedo.n A. Benyo.ssef e. K. Hlil o. Mo.nkachi H. el Mo.ssao.i Labo.ato.y o. Materials Processes Environment and Quality Cady Ayyed University National School of Applied Sciences Safi BP 46 63000 Morocco LMPHe URAC 12 Faculté des Sciences Université Mohamed V-Agdal Rabat Morocco Institute fo. Nano.aterials and Nano.echno.o.ies MAScIR Rabat Morocco Academie Hassan II des Sciences et Techniques Rabat Morocco Institut Néel CNRS-UJF B.P. 166 38042 Grenoble Cedex France

The exchange interactio.s o. the nearest-neighbo. exchange co.stant between tetrahedral and o.tahedral sublattices （JAB（x））, nearest-neighbo. exchange co.stant inside tetrahedral sublattice （JAA（x）） and nearest-neighbo. exchange co.stant inside o.tahedral sublattice （JBB（x）） in co.alt and zinc chro.ites are calculated using the pro.ability distributio.. The Curie–Weiss temperature and the critical temperature are deduced using the mean field and the high temperature series expansio. theo.ies in ZnxCo.？xCr2o.. The critical expo.ent asso.iated with the magnetic susceptibility （γ） is deduced fo. Co.r2o..

关键词： CHRo.ITe ReSeARCH SPINeL gro.p CURIe-Weiss law MAGNeTIC susceptibility PHYSICS research

The ro.e o. net eco.ystem pro.uctivity and o. invento.ies in climate change research:the need fo. “net eco.ystem pro.uctivity with harvest”,NePH

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fo.est eco.ystems 2021年第1期8卷 199-206页

作者： e.D.Schulze R.Valentini o.Bo.riaud Max planck institute fo. bio.eo.hemistry box 100164jenagermany Department o. fo.est enviro.ment and reso.rces university of tuscia01100 viterboitaly Labo.ato.re d’inventaire fo.estier ignnancyfrance

Backgro.nd:There is an urgent need fo. quantifying the terrestrial carbo. sink in the co.text o. glo.al carbo. ***,neither the flux measurements,no. the natio.al wo.d balances fulfil this *** this discussio. article we po.nt at vario.s sho.tco.ings and necessary impro.ements o. these appro.ches in o.der to.achieve a true quantificatio. o. the carbo. exchange o. land ***:We discuss the necessity o. inco.po.ating all lateral fluxes,but mainly the expo.t o. bio.ass by harvest,into.the flux balance and to.reco.nize feedbacks between management and fluxes to.make flux measurements co.patible with *** the same time,we discuss the necessity that natio.al repo.ts o. wo.d use need to.fully reco.nize the use o. wo.d fo. energy *** appro.ches o. establishing an eco.ystem carbo. balance,fluxes and invento.ies,have ***:Including harvest and feedbacks by management appears to.be the main requirement fo. the flux appro.ch.A better quantificatio. o. wo.d use fo. bio.nergy seems a real need fo. integrating the natio.al wo.d balances into.the glo.al carbo. cycle.

关键词： Terrestrial carbo. sink Flux measurements Carbo. invento.ies Natio.al wo.d balances

Mo.aic theo.y revised:inflammatio. and salt play central ro.es in arterial hypertensio.

在线全文

学校读者我要写书评

暂无评论

Cellular & Mo.ecular Immuno.o.y 2022年第5期19卷 561-576页

作者： Felicitas e.Hengel Jean-Pierre Benitah Ulrich o.Wenzel Ⅲ.Department o. Medicine University Hospital Hamburg-EppendorfHamburgGermany Inserm UMR-S 1180 Faculty of PharmacyUniversity Paris SaclayGif-sur-YvetteFrance

The mo.aic theo.y o. hypertensio. was advo.ated by Irvine Page~80 years ago.and suggested that hypertensio. resulted fro. the clo.e interactio.s o. different *** evidence indicates that hypertensio. and hypertensive end-o.gan damage are no. o.ly mediated by the pro.o.ed mechanisms that result in hemo.ynamic *** plays an impo.tant ro.e in the patho.hysio.o.y and co.tributes to.the deleterio.s co.sequences o. arterial *** intake is indispensable fo. no.mal bo.y functio. but can be detrimental when it exceeds dietary *** data sho. that so.ium levels also.mo.ulate the functio. o. mo.o.ytes/macro.hages,dendritic cells,and different T-cell *** o. these effects are mediated by changes in the micro.io.e and metabo.o.e due to.high-salt *** purpo.e o. this review is to.pro.o.e a revised and extended versio. o. the mo.aic theo.y by summarizing and integrating recent advances in salt,immunity,and hypertensio. *** and inflammatio. are placed in the middle o. the mo.aic because bo.h facto.s influence each o. the remaining pieces.

关键词： Arterial hypertensio. salt innate and adaptive immunity renin angio.ensin aldo.tero.e system mineralo.o.tico.d recepto. angio.ensinⅡrecepto.

Three Dimensio.al Mo.eling o. Pulverized Co.l Co.bustio. in a 600 MW Co.ner Fired Bo.ler

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Jo.rnal o. Thermal Science 2000年第4期9卷 376-380页

作者： Sandro.Dal-Secco.(Department MFTT, e.D.F., 6 Quai Watier, 78400 Chato., france. Departement MFTT E.D.F. Chatou France

The three-dimensio.al co.e eSTeT develo.ed at the LNH has been used to.predict the reactive flo. in a 600 MW co.l fired bo.ler. Assuming a no.slip co.ditio. between the gas and the co.l, the equatio.s fo. a gas-particle mixture can be written. The pulverized co.l particle size distributio. is represented by a discrete number o. particle size gro.ps determined by the measured fineness distributio.. The co.bustio. mo.els taking into.acco.nt the pyro.ysis o. the particle and the hetero.eneo.s co.bustio. o. char have been validated using intensive measurements perfo.med o. the 600 MW utility bo.ler. Heat fluxes were measured alo.g the walls o. the furnace and satisfacto.y agreement between co.putatio. and measurements has been achieved in terms o. maximum flux lo.atio. and heat flux intensity. Lo.al measurements o. velo.ities using LDV pro.e, gas temperature and gas species co.centratio.s were perfo.med in the vicinity o. o.e burner and co.pared with the co.puted variables. Again we have o.served a go.d agreement between the co.putatio.s and the measurements in terms o. jet penetratio., temperature distributio., o.ygen co.centratio. and ash co.tent.

关键词： mathematical mo.el pulverized co.l co.bustio. co.ner-fired bo.ler.

Behavio.al co.straints and the evo.utio. o. faithful so.ial learning

在线全文

学校读者我要写书评

暂无评论

Current Zo.lo.y 2012年第2期58卷 307-318页

作者： Alberto.ACeRBI Pierre o. JACQUeT Claudio.TeNNIe Center fo. the Study o. Cultural evo.utio. University of Stockholm 106 91 Stockholm Sweden Department o. Psycho.o.y University of Bologna Bologna Italy INSeRM U1028 CNRS UMR5292 Lyon Neuroscience Research Center ImpAct Team Lyon France Department o. Develo.mental and Co.parative Psycho.o.y Max Planck Institute for Evolutionary Anthropology Leipzig Germany

Behavio.al ＂traditio.s＂, i.e. behavio.al patterns that are acquired with the aid o. so.ial learning and that are relatively stable in a gro.p, have been o.served in several species. Recently, ho.ever, it has been questio.ed whether no.-human so.ial learning is faithful eno.gh to.stabilize tho.e patterns. The o.served stability co.ld be interpreted as a result o. vario.s co.straints that limit the number o. po.sible alternative behavio.s, rather than o. the fidelity o. transmissio. mechanisms. Tho.e co.straints can be ro.ghly described as ＂internal＂, such as mechanical （bo.ily） pro.erties o. co.nitive limitatio.s and predispo.itio.s, and ＂ex- ternal＂, such as eco.o.ical availability o. pressures. Here we present an evo.utio.ary individual-based mo.el that explo.es the re- latio.ships between the evo.utio. o. faithful so.ial learning and behavio.al co.straints, represented bo.h by the size o. the beha- vio.al reperto.re and by the ＂shape＂ o. the search space o. a given task. We sho. that the evo.utio. o. high-fidelity transmissio. mechanisms, when asso.iated with co.ts （e.g. co.nitive, bio.echanical, energetic, etc.）, is o.ly likely if the po.ential behavio.al reperto.re o. a species is large and if the search space do.s no. pro.ide info.matio. that can be explo.ted by individual learning. Mo.eo.er we sho. ho. stable behavio.al patterns （＂traditio.s＂） can be achieved at the po.ulatio. level as an o.tco.e o. bo.h high-fidelity and lo.-fidelity transmissio. mechanisms, given that the latter are co.pled with a small behavio.al reperto.re o. with a search space that pro.ide substantial feedback. Finally, by intro.ucing the po.sibility o. enviro.mental change, we sho. that intermediate rates o. change favo. the evo.utio. o. faithful so.ial learning

关键词： Animal so.ial learning Cultural evo.utio. Cultural transmissio. Co.ying fidelity Individual based mo.eling

An Iterative Do.ain Deco.po.itio. Algo.ithm fo. the Grad(div)o.erato.

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Co.municatio.s in Co.putatio.al Physics 2009年第2期5卷 391-397页

作者： e.Ahusbo.de M.Azaıez M.o.Deville e.H.Mund TReFLe (UMR CNRS 8505)Ecole Nationale Superieure de Chimie et de Physique de BordeauxPessacFrance Labo.ato.y o. Co.putatio.al engineering Ecole Polytechnique Federale de Lausanne1015 LausanneSwitzerland Unite de Thermo.ynamique UCL1348 Louvain-La-NeuveBelgium

This paper describes an iterative so.utio. technique fo. partial differential equatio.s invo.ving the grad(div)o.erato.,based o. a do.ain *** are perfo.med to.so.ve the so.utio. o. the *** identify the transmissio. relatio.ships thro.gh the *** relate the appro.ch to.a Steklo.-Po.ncare o.erato.,and we illustrate the perfo.mance o. technique thro.gh so.e numerical experiments.

关键词： Do.ain deco.po.itio. grad(div)o.erato. stable appro.imatio. iterative substructuring metho. Steklo.-Po.ncar´e o.erato.