检索结果-南通市图书馆

ASYMPTOTIC ANALYSIS OF SHELLS VIA г-CONVERGENCE

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2000年第4期18卷 337-352页

作者： Karine Genevey (Laboratoire D’Analyse Numerique, Tour 55, universite pierre et marie curie, 4 place Jussieu, 75005 Paris, France) universite pierre et marie curie 法国 Paris 75005

We give a new justification of the linear membrane and flexural shell models. We prove that the sequence of scaled energy functionals associated with the scaled problem r-converges to the energy functional associated with a two-dimensional model. This two-dimensional model is a membrane or flexural one, depending on the geometric and kinematic conditions. Then, a classical argument allows to give a new proof of the convergence theorems recently obtained by P.G. Ciarlet, V. Lods and B. Miara.

关键词： г-converges linear elastic shell

JACQUES-LOUIS LIONS,1928-2001

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2002年第2期23卷 137-148页

作者： P.G.CIARLet Analyse Numerique Universite Pierre et Marie Curie

Jacques-Louis Lions was born in the heart of Provence in the charming city of Grasse,much renowned for its perfume industry and its historical *** spite of his young age, he had the courage and determination to join the FrenchResistance at the end of 1943, as a soldier in the FFI (French Forces of the Interior). Therehe met Andree, his wife and life-long companion.

关键词： Jacques-Louis-Lions 生平数学家法国应用数学变分不等式优化控制

The Sword of Damocles behind the Curtain of the Earth’s Global Warming: A Review

在线全文

学校读者我要写书评

暂无评论

International Journal of Geosciences 2024年第2期15卷 119-136页

作者： Jacques Bourgois Institut des Sciences de la Terre Paris (iSTeP) Unité Mixte de Recherche (UMR) 7193 Université Pierre et Marie Curie (UPMC)/Université Paris 06 Paris France iSTeP UMR 7193 Centre National de la Recherche Scientifique (CNRS) Paris France

The “mainstream” climatology (MSC)—i.e. which includes the Intergovernmental Panel on Climate Change (IPCC) community—considers the present day massive release of greenhouse gases into the atmosphere as the main cause of the current global warming trend. The main inference from this stance is that the increase in temperature must occur after the release of greenhouse gases originating from the anthropic activities. However, no scientific evidence has been provided for this basic notion. Earth paleoclimatic records document the antecedence of temperature over CO2 levels. For the past 65 Ma, the temperature parameter has controlled the subsequent increase in CO2. This includes the three rapid aberrant shifts and extreme climate transients at 55 Ma, 34 Ma, and 23 Ma REF _Ref159913672 \r \h \* MERGEFORMAT [1]. The simple fact of their existence points to the potential for highly nonlinear responses in climate forcing. Whatever these shifts and transients are, CO2 remains a second order parameter in their evolution through time. Confronted with the past, a suitable response must therefore be given to the unresolved question of whether the CO2 trends precede the temperature trends in the current period, or not. The assertion that the current global warming is anthropogenic in origin implicitly presupposes a change of paradigm, with the consequence (the increase in CO2 levels) that occurred in Earth’s past being positioned as the cause of the warming for its present day climatic evolution. The compulsory assumption regarding the antecedence of CO2 levels over the temperature trends is associated with the haziness of the methodological framework—i.e. the paradigm—and tightens the research fields on the likely origins of global warming. The possible involvement of an “aberrant” natural event, hidden behind the massive release of greenhouse gases, has not been considered by the MSC.

关键词： Climate CO2 Temperature Paleoclimate Warming

INEQUALITY OF KORN'S TYPE ON COMPACT SURFACES WITHOUT BOUNDARY

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

Chinese Annals of Mathematics,Series B 2003年第2期24卷 191-204页

作者： S.MARDARE Laboratoire Jacques-Louis Lions Universite Pierre et Marie Curie4 Place Jussieu75005 ParisFrance.

Inequalities of Korn's type on a surface with boundary have been proved in many papersusing different techniques (see e.g. [4, 5, 11]). The author proves here an inequality of Korn'stype on a compact surface without boundary. The idea is to use a finite number of maps fordefining the surface and the inequality of Korn's type without boundary conditions for everymap and to recast these in a general functional analysis setting about quotient spaces.

关键词： Inequality of Korn's type Compact surface Sobolev space

An Estimate on Riemannian Manifolds of Dimension 4

在线全文

学校读者我要写书评

暂无评论

Analysis in Theory and Applications 2016年第3期32卷 272-282页

作者： Samy Skander Bahoura Departement de Mathematiques Universite Pierre et Marie Curie

We give an estimate of type sup x inf on Riemannian manifold of dimension 4 for a Yamabe type equation.

关键词： sup x inf Riemannian manifold dimension 4

ＳＴＡＢＬＥＡＮＤＵＮＳＴＡＢＬＥＩＤＥＡＬＰＬＡＮＥＦＬＯＷＳ

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2002年第2期23卷 149-164页

作者： C.BARDOS Y.GUO W.STRAUSS universite DivisionDepartment Denis Diderot and LAN Universite Pierre et Marie CurieParisFrance.of Applied MathematicsBrown UniversityProvidenceRhode Island 02912U?

The authors investigate the stability of a steady ideal plane flow in an arbitrary domain in terms of the L^2 norm of the vorticity. Linear stability implies nonlinear instability provided the growth rate of the linearized system exceeds the Liapunov exponent of the flow. In contrast,a maximizer of the entropy subject to constant energy and mass is stable. This implies the stability of certain solutions of the mean field equation.

关键词： Stable ideal plane flows Unstable ideal plane flows Liapunov exponent

Neutron diffraction studies on ‘‘simple'' iron oxides under pressure: Fe_3O_4, a-Fe_2O_3, and FeO

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2014年第36期59卷 5241-5250页

作者： Stefan Klotz IMPMC CNRS UMR 7590 Universite' Pierre & Marie Curie75252 Paris France

Fe3O4(magnetite), a-Fe2O3(hematite), and Fe O(wu¨ stite) are the three major iron oxides and some of the most fundamental solids in nature. Interest in these systems is due to their abundance as minerals in the Earth and other telluric planets as well as their interesting electronic and magnetic properties which have been studied for decades. In this article, we review high-pressure studies on these three systems using neutron powder diffraction in the0–14 GPa range with a particular focus on the behavior of magnetism under pressure. Unpublished data on the pressure dependence of the Ne′el temperature in Fe O are presented. This review will give at the same time an introduction into technical aspects and illustrate the potential of high-pressure neutron scattering in the future.

关键词：四氧化三铁 α-氧化铁中子衍射 α-Fe2O3 磁压力 FeO 中子散射磁铁矿

Pressure Boundary Conditions for Blood Flows

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2015年第5期36卷 829-842页

作者： Kirill P.GOSTAF Olivier PIRONNEAU Department of Mathematics Simon Fraser University Laboratoire Jacques-Louis Lions Université Pierre et Marie Curie

Simulations of blood flows in arteries require numerical solutions of fluidstructure interactions involving Navier-Stokes equations coupled with large displacement visco-elasticity for the *** the various simplifications which have been proposed, the surface pressure model leads to a hierarchy of simpler models including one that involves only the pressure. The model exhibits fundamental frequencies which can be computed and compared with the pulse. Yet unconditionally stable time discretizations can be constructed by combining implicit time schemes with Galerkin-characteristic discretization of the convection terms in the Navier-Stokes equations. Such problems with prescribed pressure on the walls will be shown to be efficient and accurate as an approximation of the full fluid structure interaction problem.

关键词： Fluid-structure interaction Compliant walls Finite element method Navier-Stokes equations Blood flow

The High Light Response and Redox Control of Thylakoid FtsH Protease in Chlamydomonas reinhardtii

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2017年第1期10卷 99-114页

作者： Fei Wang Yafei Qi Alizee Malnoe Yves Choquet Francis-Andre Wollman Institut de Biologie Physico-Chimique Unite Mixte de Recherche 7141 Centre National de la Recherche Scientifique/Universite Pierre et Marie Curie Paris 75005 France

In Chlamydomonas reinhardtii, the major protease involved in the maintenance of photosynthetic machinery in thylakoid membranes, the FtsH protease, mostly forms large hetero-oligomers （-1 MDa） comprising FtsH1 and FtsH2 subunits, whatever the light intensity for growth. Upon high light exposure, the FtsH subunits display a shorter half-life, which is counterbalanced by an increase in FTSH1/2 mRNA levels, resulting in the modest upregulation of FtsH1/2 proteins. Furthermore, we found that high light increases the protease activity through a hitherto unnoticed redox-controlled reduction of intermolecular disulfide bridges. We iso- lated a Chlamydomonas FTSH1 promoter-deficient mutant, ftsh1-3, resulting from the insertion of a TOC1 transposon, in which the high light-induced upregulation of FTSH1 gene expression is largely lost. In ftsh1- 3, the abundance of FtsH1 and FtsH2 proteins are loosely coupled （decreased by 70% and 30%, respectively） with no formation of large and stable homo-oligomers. Using strains exhibiting different accumulation levels of the FtsH1 subunit after complementation of ftsh1-3, we demonstrate that high light tolerance is tightly correlated with the abundance of the FtsH protease. Thus, the response of Chlamydomonas to light stress involves higher levels of FtsH 1/2 subunits associated into large complexes with increased proteolytic activity.

关键词： chloroplast protease regulation of gene expression photoinhibition Chlamydomonas reinhardtii