发布求助
文献互助 智能选刊 最新文献

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

筛选
英文 中文
Identification de modèles tribologiques par pendule 用钟摆识别摩擦学模型
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 1999-11-01 DOI: 10.1016/S1287-4620(00)88650-0
Yves Lenoir
{"title":"Identification de modèles tribologiques par pendule","authors":"Yves Lenoir","doi":"10.1016/S1287-4620(00)88650-0","DOIUrl":"10.1016/S1287-4620(00)88650-0","url":null,"abstract":"<div><p>A model is developed to calculate the period and damping of a rigid pendulum's oscillations when submitted to friction. A theoretical investigation shows that the pendulum is a sensitive accurate tool for assessing friction phenomena of very low intensity. The process of measurement and analysis method is then used to identify a real pendulum.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"327 12","pages":"Pages 1259-1264"},"PeriodicalIF":0.0,"publicationDate":"1999-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)88650-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75020961","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
Cinématique et transfert de contraintes dans des réseaux quasi plans aléatoires de fibres 准平面随机纤维网络中的运动学和应力传递
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 1999-11-01 DOI: 10.1016/S1287-4620(00)88645-7
Martin Ostoja-Starzewski , Marco B. Quadrelli , Douglas C. Stahl
{"title":"Cinématique et transfert de contraintes dans des réseaux quasi plans aléatoires de fibres","authors":"Martin Ostoja-Starzewski ,&nbsp;Marco B. Quadrelli ,&nbsp;Douglas C. Stahl","doi":"10.1016/S1287-4620(00)88645-7","DOIUrl":"10.1016/S1287-4620(00)88645-7","url":null,"abstract":"<div><p>The mechanics of paper is considered from the standpoint of fibre networks. It is shown that the classical model of paper, based on a network of infinitely long fibres capable of carrying only axial forces [1], having the geometry of a Poisson line field, does not possess generic rigidity. This pathological behaviour can be removed by the introduction of rigid fibre-fibre bonds (justified by the presence of hydrogen bonding between cellulose fibres) and fibre flexural stiffness.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"327 12","pages":"Pages 1223-1229"},"PeriodicalIF":0.0,"publicationDate":"1999-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)88645-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86323877","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
Flux d'énergie d'un écoulement de Poiseuille vers la paroi d'un tube élastique, a. Modes d'instabilité axisymétrique 从鱼流到弹性管壁的能量流，a.轴对称不稳定模式
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 1999-10-01 DOI: 10.1016/S1287-4620(00)88519-1
Mahmoud Hamadiche
{"title":"Flux d'énergie d'un écoulement de Poiseuille vers la paroi d'un tube élastique, a. Modes d'instabilité axisymétrique","authors":"Mahmoud Hamadiche","doi":"10.1016/S1287-4620(00)88519-1","DOIUrl":"10.1016/S1287-4620(00)88519-1","url":null,"abstract":"<div><p>Ne compute the energy flux from a fluid flowing to an elastic hollow cylindrical tube generated by unstable modes. The basic fluid velocity flow is the parabolic Hagen-Poiseuille flow. We show that the energy flux from the fluid flowing to the elastic wall is positive when the mode is unstable, negative when the mode is stable, and null when the mode is neutral. Moreover the energy flux from the fluid flowing to the elastic solid is generated by the component of the force perpendicular to the wall at the interface for high Reynolds numbers, and essentially by the streamwise component of the force at interface for low Reynolds numbers.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"327 11","pages":"Pages 1155-1161"},"PeriodicalIF":0.0,"publicationDate":"1999-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)88519-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87696551","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: 2
Flux d'énergie d'un écoulement de Poiseuille vers la paroi d'un tube élastique, b. Modes d'instabilité non axisymétriques 从鱼流到弹性管壁的能量流，b.非轴对称不稳定性模式
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 1999-10-01 DOI: 10.1016/S1287-4620(00)88520-8
Mahmoud Hamadiche
{"title":"Flux d'énergie d'un écoulement de Poiseuille vers la paroi d'un tube élastique, b. Modes d'instabilité non axisymétriques","authors":"Mahmoud Hamadiche","doi":"10.1016/S1287-4620(00)88520-8","DOIUrl":"10.1016/S1287-4620(00)88520-8","url":null,"abstract":"<div><p>We examine in this paper the energy flux carried out by the most unstable non-axisymmetric mode from Hagen-Poiseuille flow to an elastic tube where the Poiseuille flow takes place. The energy flux, from the flowing fluid to the elastic tube and the rate of amplification of unstable modes are plotted against the depth of the elastic material H — 1 and against the Reynolds number Re. The power developed by each component of the force at the interface is plotted too against H and Re. In this way, the force component at the interface which provides energy transfer to the solid medium is identified, and the origin of the instability is better understood.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"327 11","pages":"Pages 1163-1170"},"PeriodicalIF":0.0,"publicationDate":"1999-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)88520-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91038299","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
Méthode de détermination des épaisseurs de films conducteurs par mesures de résistance de surface 通过测量表面电阻来确定导电膜厚度的方法
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 1999-10-01 DOI: 10.1016/S1287-4620(00)88525-7
Frédéric Voiron, Xavier Federspiel, Michel Ignat
{"title":"Méthode de détermination des épaisseurs de films conducteurs par mesures de résistance de surface","authors":"Frédéric Voiron,&nbsp;Xavier Federspiel,&nbsp;Michel Ignat","doi":"10.1016/S1287-4620(00)88525-7","DOIUrl":"10.1016/S1287-4620(00)88525-7","url":null,"abstract":"<div><p>To evaluate the thickness of the layers of a Ti/TiAl<sub>3</sub>/Al system, experiments based on surface resistance measurements have been performed. The thickness of each layer is deduced from a comparison among calculated and measured values of resistance. We present here a solution for the simulation of surface resistance and the results obtained with this method on Ti/TiAl<sub>3</sub>/Al systems.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"327 11","pages":"Pages 1197-1200"},"PeriodicalIF":0.0,"publicationDate":"1999-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)88525-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73443378","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
La mission solaire SOHO: quelques résultats récents SOHO太阳任务:最近的一些结果
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 1999-10-01 DOI: 10.1016/S1287-4620(00)88526-9
Jean-Claude Vial
{"title":"La mission solaire SOHO: quelques résultats récents","authors":"Jean-Claude Vial","doi":"10.1016/S1287-4620(00)88526-9","DOIUrl":"10.1016/S1287-4620(00)88526-9","url":null,"abstract":"<div><p>After more than 3 years of operations, the SOHO solar mission has brought a large body of new results, the full exploitation of which continues. SOHO has provided evidence of the role of magnetic reconnection at many different spatial scales (including scales smaller than any spatial resolution) in direct heating by the Joule effect, or in generating MHD waves or accelerating particles. Reconnection seems to occur very low in the atmosphere with a permanent reshuffling of magnetic fields resulting from flux emergence at the borders of the supergranulation network. SOHO has also demonstrated the multifluid nature of the solar wind in the low corona where ion (and proton) temperatures are higher than electron temperatures. This ion heating can be explained by resonance between MHD waves and ion (and proton) gyration around the field lines. Such conclusions (and others) will be tested over the next few years with new observations from SOHO.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"327 11","pages":"Pages 1201-1214"},"PeriodicalIF":0.0,"publicationDate":"1999-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)88526-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78555006","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
Sur une méthode de projection vectorielle pour la résolution des équations de Navier-Stokes 求解Navier-Stokes方程的矢量投影方法
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 1999-10-01 DOI: 10.1016/S1287-4620(00)88522-1
Jean-Paul Caltagirone, Jérôme Breil
{"title":"Sur une méthode de projection vectorielle pour la résolution des équations de Navier-Stokes","authors":"Jean-Paul Caltagirone,&nbsp;Jérôme Breil","doi":"10.1016/S1287-4620(00)88522-1","DOIUrl":"10.1016/S1287-4620(00)88522-1","url":null,"abstract":"<div><p>We propose a method of solving the Navier-Stokes equations in incompressible flow. It is based on the projection of the velocity field, approached by a prediction step on a zero divergence field. The novelty of this method concerns how the projection is made, directly operating on all the components of the velocity field through a coupling. A highly implicit algorithm allows us to maintain all physical boundary conditions of the problem during the solution steps.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"327 11","pages":"Pages 1179-1184"},"PeriodicalIF":0.0,"publicationDate":"1999-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)88522-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86422518","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: 32
Instabilité et décrochage tournant en grille d'aubes 不稳定和失速旋转叶片网格
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 1999-10-01 DOI: 10.1016/S1287-4620(00)88518-X
Frédéric Oblé, Daniel Buisine
{"title":"Instabilité et décrochage tournant en grille d'aubes","authors":"Frédéric Oblé,&nbsp;Daniel Buisine","doi":"10.1016/S1287-4620(00)88518-X","DOIUrl":"10.1016/S1287-4620(00)88518-X","url":null,"abstract":"<div><p>Rotating stall is a fundamental hydrodynamic instability which is encountered in most hydraulic and aeraulic turbomachinery. It appears to exist only with cascades that considerably slow down the fluid flow and occurs in the form of rotating structures in which the flow rate may be negative. The paper analyses this instability and its transitions in a simple two-dimensional configuration using a multi-domain numerical scheme and solver. The space-time variation of the flow rates occurring for an angle of attack increasing by steps shows first standing waves, then intermittent and permanent travelling waves of limited amplitude, corresponding to blade stall. At higher angles of attack, a high amplitude wave propagates a single structure (cell) with a negative flow rate, corresponding to stalling of the cascade.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"327 11","pages":"Pages 1147-1154"},"PeriodicalIF":0.0,"publicationDate":"1999-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)88518-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87092652","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
Analyse asymptotique des jonctions de coques en flexion 壳体弯曲接头的渐近分析
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 1999-10-01 DOI: 10.1016/S1287-4620(00)88515-4
Jean-Luc Akian
{"title":"Analyse asymptotique des jonctions de coques en flexion","authors":"Jean-Luc Akian","doi":"10.1016/S1287-4620(00)88515-4","DOIUrl":"10.1016/S1287-4620(00)88515-4","url":null,"abstract":"<div><p>We consider a multi-structure made of two shells of thickness <em>2</em>ɛ, having a middle surface of class %plane1D;49E;<sup>3</sup> glued together on a part of their boundaries. We suppose that at every point of their intersection, the middle surfaces have distinct tangent planes. We make an assumption on the junction and on the applied body force density, and we identify the limit, when ɛ → 0, of the scaled three-dimensional displacement field for the multi-structure, showing in particular that the limit displacement field does not depend on the transverse variable, is inextensional, and that the angle between the two shells remains the same during the deformation.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"327 11","pages":"Pages 1129-1132"},"PeriodicalIF":0.0,"publicationDate":"1999-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)88515-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76915404","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: 4
Dynamique des écoulements en milieux poreux double échelle 多孔介质中的流动动力学双尺度
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 1999-10-01 DOI: 10.1016/S1287-4620(00)88521-X
Yann Henzel, Joël Bréard, Patrick Faitout, David Cayeux, Raymond Gauvin
{"title":"Dynamique des écoulements en milieux poreux double échelle","authors":"Yann Henzel,&nbsp;Joël Bréard,&nbsp;Patrick Faitout,&nbsp;David Cayeux,&nbsp;Raymond Gauvin","doi":"10.1016/S1287-4620(00)88521-X","DOIUrl":"10.1016/S1287-4620(00)88521-X","url":null,"abstract":"<div><p>Simple mathematical models with two time constants are used to study the dynamics of pressure variation during permeability measurements on dual porosity saturated media. We think that these transient phase dynamic aspects, which Darcy's Law cannot explain, are a macroscopic image of flows in macro and micropores.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"327 11","pages":"Pages 1171-1177"},"PeriodicalIF":0.0,"publicationDate":"1999-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)88521-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86472307","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
首页 上一页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信