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Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy最新文献

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Origine des courants ioniques dans les cellules biologiques 生物细胞中离子电流的起源
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-03-01 DOI: 10.1016/S1251-8069(99)89009-5
Marc Léonetti, Élisabeth Dubois-Violette
{"title":"Origine des courants ioniques dans les cellules biologiques","authors":"Marc Léonetti,&nbsp;Élisabeth Dubois-Violette","doi":"10.1016/S1251-8069(99)89009-5","DOIUrl":"10.1016/S1251-8069(99)89009-5","url":null,"abstract":"<div><p>The cable model describes the electric behavior of a biological cell membrane. For positive membrane conductance its potential is stable. This model does not explicitly take into account diffusion effects. We show that if the diffusion of the different ionic species is taken into account, an instability can set in for a positive global differential conductance. The instability is then characterized by a spatial modulation of the membrane potential and the occurrence of ionic circulations.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 3","pages":"Pages 205-210"},"PeriodicalIF":0.0,"publicationDate":"1998-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(99)89009-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"94865836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Principe d'absorption limite pour l'opérateur de Maxwell dans un milieu bihomogène 双均匀介质中麦克斯韦算子的极限吸收原理
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-03-01 DOI: 10.1016/S1251-8069(99)89007-1
Éric Soccorsi
{"title":"Principe d'absorption limite pour l'opérateur de Maxwell dans un milieu bihomogène","authors":"Éric Soccorsi","doi":"10.1016/S1251-8069(99)89007-1","DOIUrl":"10.1016/S1251-8069(99)89007-1","url":null,"abstract":"<div><p>We consider the Maxwell operator <span><math><mtext>A</mtext></math></span> that describes 3D electromagnetic wave propagation in an infinite cylindrical wave guide with a rectangular section, where the medium is made of two homogeneous parts separated by a vertical interface. The spectral analysis of this operator points out a countable family of real numbers in the spectrum called thresholds, and the resolvent operator R<sub><span><math><mtext>A</mtext></math></span></sub>(z) = (<span><math><mtext>A</mtext></math></span> − z)<sup>−1</sup>, Im (z)) ≠ 0, can be extended (‘limiting absorption principle’) continuously to the lower or upper half-planes (origin excepted) in a suitable weighted L<sup>2</sup>-topology. In particular, this continuity holds at the thresholds.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 3","pages":"Pages 191-196"},"PeriodicalIF":0.0,"publicationDate":"1998-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(99)89007-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"98958331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Oscillations non linéaires des polytropes magnétiques 磁性多向异性的非线性振荡
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-03-01 DOI: 10.1016/S1251-8069(99)89011-3
Cristina Blaga
{"title":"Oscillations non linéaires des polytropes magnétiques","authors":"Cristina Blaga","doi":"10.1016/S1251-8069(99)89011-3","DOIUrl":"10.1016/S1251-8069(99)89011-3","url":null,"abstract":"<div><p>The paper includes a qualitative study of the equation of radial, nonlinear, nonadiabatic pulsations of the magnetic polytropes. The magnetic field is considered to be purely toroidal and weak. The nonadiabatic effects are described by two parameters μ related to the sources of energy and λ proportional with the damping of the energy. We find that there is only one equilibrium point for this equation. Its character is determined by μ. Whatever the values of the parameters involved, periodic orbits exist if μ &gt; 0. These are unique and stable only if μ and λ are small. We note that in our qualitative analysis a major role is played by μ, λ is assumed to be small based on observational grounds. Numerical examples confirm and complete the qualitative analysis.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 3","pages":"Pages 219-225"},"PeriodicalIF":0.0,"publicationDate":"1998-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(99)89011-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"94425851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Contrôle de la stabilité d'un écoulement thermoconvectif par un champ magnétique tournant 通过旋转磁场控制热对流流动的稳定性
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-03-01 DOI: 10.1016/S1251-8069(99)89006-X
Philippe Marty , Pierre Trombetta , Jean-Paul Garandet
{"title":"Contrôle de la stabilité d'un écoulement thermoconvectif par un champ magnétique tournant","authors":"Philippe Marty ,&nbsp;Pierre Trombetta ,&nbsp;Jean-Paul Garandet","doi":"10.1016/S1251-8069(99)89006-X","DOIUrl":"10.1016/S1251-8069(99)89006-X","url":null,"abstract":"<div><p>We study the flow of a liquid metal driven by thermal buoyancy in a cylindrical container. It is shown that an instability of the mixing-layer type is responsible for fluctuations of velocity and temperature when a critical value of the Grashof number is reached. This instability can be suppressed when a moderate rotating magnetic field is applied. It is shown that the Ekman pumping is responsible for the stabilisation of the initial buoyancy driven flow.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 3","pages":"Pages 185-190"},"PeriodicalIF":0.0,"publicationDate":"1998-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(99)89006-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"106141083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Propagation de fissures en mode mixte (I + III) ou (I + II + III) 双模混合裂纹扩展(I + III)或(I + II + III)
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-03-01 DOI: 10.1016/S1251-8069(99)89004-6
Véronique Lazarus, Jean-Baptiste Leblond
{"title":"Propagation de fissures en mode mixte (I + III) ou (I + II + III)","authors":"Véronique Lazarus,&nbsp;Jean-Baptiste Leblond","doi":"10.1016/S1251-8069(99)89004-6","DOIUrl":"10.1016/S1251-8069(99)89004-6","url":null,"abstract":"<div><p>Fracture and fatigue experiments we have performed under mixed mode (I + III) and (I + II + III) loadings have shown that as the crack extends, the front gradually twists around the direction of propagation to reach a pure opening mode. This implies that the kink angle of the crack extension at the beginning of the propagation is variable along the front. The aim of this paper is to determine, in the context of linear elastic fracture mechanics, the value of this kink angle along the whole front. The values obtained are compared to the experimental ones.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 3","pages":"Pages 171-177"},"PeriodicalIF":0.0,"publicationDate":"1998-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(99)89004-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"104900125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Analyse statistique de points brillants solaires observés par le satellite SOHO SOHO卫星观测到的太阳耀斑的统计分析
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-03-01 DOI: 10.1016/S1251-8069(99)89010-1
Stéphane Régnier , Karine Bocchialini , Jean-Claude Vial , Jean-Pierre Delaboudinière , William Thompson
{"title":"Analyse statistique de points brillants solaires observés par le satellite SOHO","authors":"Stéphane Régnier ,&nbsp;Karine Bocchialini ,&nbsp;Jean-Claude Vial ,&nbsp;Jean-Pierre Delaboudinière ,&nbsp;William Thompson","doi":"10.1016/S1251-8069(99)89010-1","DOIUrl":"10.1016/S1251-8069(99)89010-1","url":null,"abstract":"<div><p>Bright points, small and short lifetime structures, appear permanently in the atmosphere and could be associated with magnetic reconnections, potential sources of coronal heating. Such structures have been observed with the coronal instruments on-board SOHO and a statistical analysis was carried out in order to find the signature of very small scale structures.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 3","pages":"Pages 211-218"},"PeriodicalIF":0.0,"publicationDate":"1998-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(99)89010-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"93609537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Étude expérimentale de la réduction de traînée d'un profil laminaire à l'aide d'actionneurs piézoélectriques 压电执行器降低层流剖面阻力的实验研究
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-02-01 DOI: 10.1016/S1251-8069(99)80068-2
Jan Wojciechowski, Tomasz Szuster, Jozef Pietrucha
{"title":"Étude expérimentale de la réduction de traînée d'un profil laminaire à l'aide d'actionneurs piézoélectriques","authors":"Jan Wojciechowski,&nbsp;Tomasz Szuster,&nbsp;Jozef Pietrucha","doi":"10.1016/S1251-8069(99)80068-2","DOIUrl":"https://doi.org/10.1016/S1251-8069(99)80068-2","url":null,"abstract":"<div><p>A segment of the upper surface of a laminar airfoil model is submitted to forced vibrations at controlled frequency by means of piezo-electric actuators. The experiment carried out in a wind tunnel demonstrated an appreciable diminution of the profile drag for some ranges of the angle of attack and Reynolds number.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 2","pages":"Pages 85-90"},"PeriodicalIF":0.0,"publicationDate":"1998-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(99)80068-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91761607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Reconstruction du champ des vitesses d'une houle longue 长波速度场的重建
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-02-01 DOI: 10.1016/S1251-8069(99)80069-4
Didier Clamond
{"title":"Reconstruction du champ des vitesses d'une houle longue","authors":"Didier Clamond","doi":"10.1016/S1251-8069(99)80069-4","DOIUrl":"10.1016/S1251-8069(99)80069-4","url":null,"abstract":"<div><p>From the shallow water gravity wave theory, an analytic transformation reconstructs the velocity field in all the fluid domains. The solution obtained is more realistic and non-divergent.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 2","pages":"Pages 91-94"},"PeriodicalIF":0.0,"publicationDate":"1998-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(99)80069-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"108881849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Effet du retrait sur la stabilisation des flammes cryotechniques 收缩对低温火焰稳定性的影响
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-02-01 DOI: 10.1016/S1251-8069(99)80072-4
Don Kendrick, Gerald Herding, Philippe Scouflaire, Carlos Rolon, Sébastien Candel
{"title":"Effet du retrait sur la stabilisation des flammes cryotechniques","authors":"Don Kendrick,&nbsp;Gerald Herding,&nbsp;Philippe Scouflaire,&nbsp;Carlos Rolon,&nbsp;Sébastien Candel","doi":"10.1016/S1251-8069(99)80072-4","DOIUrl":"https://doi.org/10.1016/S1251-8069(99)80072-4","url":null,"abstract":"<div><p>Mechanisms involved in cryogenic flame stabilization are important in liquid rocket propulsion applications. These mechanisms are studied experimentally in this article by considering a single jet-flame formed by a coaxial injector fed by liquid oxygen (LOX) and gaseous hydrogen (GH<sub>2</sub>). The flame is analyzed by imaging the light emitted by hydroxyl (OH) radicals. To characterize the reaction zone structure one takes the average of the light emission signal. The result of this operation is then treated by numerical tomography (based on the Abel transform) to get the local volumetric light intensity distribution. This method is used to study the effect of the LOX tube recess on the structure of the flame in the vicinity of the injection plane. It is shown that the recess augments the flame expansion angle and the size of the volume where the reaction takes place.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 2","pages":"Pages 111-116"},"PeriodicalIF":0.0,"publicationDate":"1998-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(99)80072-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91761605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Des poutres flexibles aux fils extensibles: une hiérarchie de modèles asymptotiques 从柔性梁到可伸缩电线:渐近模型的层次结构
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-02-01 DOI: 10.1016/S1251-8069(99)80067-0
Jean-Jacques Marigo , Hamid Ghidouche , Zubir Sedkaoui
{"title":"Des poutres flexibles aux fils extensibles: une hiérarchie de modèles asymptotiques","authors":"Jean-Jacques Marigo ,&nbsp;Hamid Ghidouche ,&nbsp;Zubir Sedkaoui","doi":"10.1016/S1251-8069(99)80067-0","DOIUrl":"10.1016/S1251-8069(99)80067-0","url":null,"abstract":"<div><p>We consider <em>slender</em> (homogeneous, Isotropie) elastic <em>cylinders</em> submitted to <em>conservative forces</em> the intensity of which is a <em>parameter</em>. In the framework of the nonlinear three dimensional theory of elastostatics, by using asymptotic expansion methods, we obtain a hierarchy-depending on the order of magnitude of the applied forces-of <em>five</em> asymptotic unidimensional models, starting from the linear theory of flexible beams to the nonlinear theory of extensible strings. © Académie des Sciences/Elsevier, Paris</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 2","pages":"Pages 79-84"},"PeriodicalIF":0.0,"publicationDate":"1998-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(99)80067-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132446928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
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