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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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Progression d'un agent de coalescence dans une emulsion 乳液中聚结剂的进展
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-05-01 DOI: 10.1016/S1251-8069(98)80201-7
Pierre-Gilles de Gennes
{"title":"Progression d'un agent de coalescence dans une emulsion","authors":"Pierre-Gilles de Gennes","doi":"10.1016/S1251-8069(98)80201-7","DOIUrl":"https://doi.org/10.1016/S1251-8069(98)80201-7","url":null,"abstract":"<div><p>We discuss the migration of a solid particle which breaks the water film between two oil droplets, in an emulsion which was originally monodisperse (droplet diameter d) and metastable. After one rupture, the particle, following the water films, moves by a distance ~ d; then, after a certain waiting time τ, it induces a new rupture. We consider two cases: the interface between an O/W emulsion and a large O reservoir, which becomes slightly rough under the action of a few panicles; and inside a monodisperse emulsion, a single particle induces the growth of a droplet (nearly spherical) of size <em>R(t)~ d(t/τ)</em><sup>1/3</sup>. In a final stage, the large drops formed over different particles come into contact, and one may end up with an oil matrix containing droplets of the O/W emulsion.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 5","pages":"Pages 331-335"},"PeriodicalIF":0.0,"publicationDate":"1998-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(98)80201-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72292902","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
Solar chromospheric structures observed in UV resonance lines: A multivariate analysis approach 在紫外共振线上观察到的太阳色球结构：一种多元分析方法
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-05-01 DOI: 10.1016/S1251-8069(98)80202-9
Spiros Patsourakos, Karine Bocchialini, Jean-Claude Vial
{"title":"Solar chromospheric structures observed in UV resonance lines: A multivariate analysis approach","authors":"Spiros Patsourakos,&nbsp;Karine Bocchialini,&nbsp;Jean-Claude Vial","doi":"10.1016/S1251-8069(98)80202-9","DOIUrl":"https://doi.org/10.1016/S1251-8069(98)80202-9","url":null,"abstract":"<div><p>We present the results of a statistical analysis carried out from a data base of six solar chromospheric emission lines recorded simultaneously and with high spectral resolution. An empirical and a clustering method for separating the different solar structure contributions have been used and been found to be in good agreement. Mean profiles corresponding to the different populations have been built. Correlations of different parameters for each profile allowed us to deduce different properties of the solar chromosphere, such as the existence of magnetic canopies and downflows in active regions.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 5","pages":"Pages 337-344"},"PeriodicalIF":0.0,"publicationDate":"1998-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(98)80202-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72243480","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
Similarity solution of a semi-infinite fluid-driven fracture in a linear elastic solid 线弹性固体中半无限流体驱动裂缝的相似解
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-05-01 DOI: 10.1016/S1251-8069(98)80194-2
Draitry Garagash, Emmanuel Detournat
{"title":"Similarity solution of a semi-infinite fluid-driven fracture in a linear elastic solid","authors":"Draitry Garagash,&nbsp;Emmanuel Detournat","doi":"10.1016/S1251-8069(98)80194-2","DOIUrl":"10.1016/S1251-8069(98)80194-2","url":null,"abstract":"<div><p>A similarity solution for a steadily moving semi-infinite fluid-driven fracture in an impermeable linear elastic solid is described in this note. The existence of a lag, of a priori unknown length, between the crack tip and the fluid front is explicitly taken into account. The asymptotic behavior of the solution at the tip is consistent with linear elastic fracture mechanics, whereas its asymptotic behaviour at infinity corresponds to a singular solution constructed under the assumption of zero fluid lag. A universal relation between fluid lag and fracture toughness is obtained.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 5","pages":"Pages 285-292"},"PeriodicalIF":0.0,"publicationDate":"1998-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(98)80194-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"112434694","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: 10
Transition à la turbulence d'une couche de mélange supersonique 超音速混合层向湍流的过渡
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-05-01 DOI: 10.1016/S1251-8069(98)80199-1
Mohamed Si Ameur, Jean-Pierre Chollet
{"title":"Transition à la turbulence d'une couche de mélange supersonique","authors":"Mohamed Si Ameur,&nbsp;Jean-Pierre Chollet","doi":"10.1016/S1251-8069(98)80199-1","DOIUrl":"https://doi.org/10.1016/S1251-8069(98)80199-1","url":null,"abstract":"<div><p>Numerical simulations are used to study the transition to turbulence of a spatially developed compressible mixing layer between rigid walls. The fast and slow flows are supersonic with Mach numbers M<sub>1</sub> = 4.5 and M<sub>2</sub>= 1.6 respectively. The full Navier-Stokes equations are solved for a 2D compressible flow with a high order Godunov 's scheme piecewise parabolic method (PPM) with the approximate Riemann solver of Roe. The purpose is to study the transition to turbulence from the linear regime of instability, with comparison to the linear stability analysis of Tam and Hu.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 5","pages":"Pages 315-322"},"PeriodicalIF":0.0,"publicationDate":"1998-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(98)80199-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72243477","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
Formation des bulles dans les fluide newtoniens et non newtoniens 牛顿和非牛顿流体中气泡的形成
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-05-01 DOI: 10.1016/S1251-8069(98)80197-8
Huai Zhi LI , Shijia Qiang
{"title":"Formation des bulles dans les fluide newtoniens et non newtoniens","authors":"Huai Zhi LI ,&nbsp;Shijia Qiang","doi":"10.1016/S1251-8069(98)80197-8","DOIUrl":"https://doi.org/10.1016/S1251-8069(98)80197-8","url":null,"abstract":"<div><p>The present study aims at providing insights into the understanding of the formation of bubbles at a submerged orifice under constant flow conditions, in both Newtonian and non-Newtonian fluids. A rigorous theoretical model was developed for describing the non-spherical bubble formation as well as the detachment at the orifice. The results predicted by this model compare satisfactorily with the experimental investigation. However, a deviation was observed in elastic fluids with the increase of gas flow rates when the memory effects become important.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 5","pages":"Pages 301-308"},"PeriodicalIF":0.0,"publicationDate":"1998-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(98)80197-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72243475","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
Sur le contact adhésif entre un poinçon axisymétrique rigide et un milieu élastique semi-infini 在刚性轴对称冲头和半无限弹性介质之间的粘合剂接触上
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-05-01 DOI: 10.1016/S1251-8069(98)80200-5
Charlotte Basire , Christian Frétigny
{"title":"Sur le contact adhésif entre un poinçon axisymétrique rigide et un milieu élastique semi-infini","authors":"Charlotte Basire ,&nbsp;Christian Frétigny","doi":"10.1016/S1251-8069(98)80200-5","DOIUrl":"https://doi.org/10.1016/S1251-8069(98)80200-5","url":null,"abstract":"<div><p>A particular superposition of coaxial cylinders is used to describe the adhesive contact between an axi-symmetric punch and an elastic material. The proposed formalism allows us to simply find the equations of the adhesive contact when the range of the interfacial forces is supposed to be zero (Maugis and Barquins ' generalisation of Johnson et al. 's results) and when the interfacial force law is described using the Dugdale model. In the latter case, explicit expressions are given for an arbitrary axi-symmetric punch profile.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 5","pages":"Pages 323-329"},"PeriodicalIF":0.0,"publicationDate":"1998-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(98)80200-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72243478","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
Heat transfer in a rotor-stator system with a radial inflow 径向流入转子-定子系统中的传热
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-05-01 DOI: 10.1016/S1251-8069(98)80198-X
Marc Djaoui, Roger Debuchy
{"title":"Heat transfer in a rotor-stator system with a radial inflow","authors":"Marc Djaoui,&nbsp;Roger Debuchy","doi":"10.1016/S1251-8069(98)80198-X","DOIUrl":"https://doi.org/10.1016/S1251-8069(98)80198-X","url":null,"abstract":"<div><p>The present work examines the turbulent flow in a rotor-stator system subjected to a radial inflow and heat transfer effects. In the scope of this study, compressibility can be neglected which leads us to dissociate the heat transfer process from the dynamical effects. A method for making simultaneous temperature and velocity measurements is used to provide qualitative and quantitative data. An analysis of the results and comparisons with a theoretical prediction issued from an asymptotical formulation brings typical properties of the flow to light.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 5","pages":"Pages 309-314"},"PeriodicalIF":0.0,"publicationDate":"1998-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(98)80198-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72243479","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: 54
Étude analytique du régime conductif des écoulements de convection dans un bain d'alliage 合金浴中对流流动传导状态的分析研究
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-04-01 DOI: 10.1016/S1251-8069(98)80034-1
Agnès Maurel , Laure Blumenfeld
{"title":"Étude analytique du régime conductif des écoulements de convection dans un bain d'alliage","authors":"Agnès Maurel ,&nbsp;Laure Blumenfeld","doi":"10.1016/S1251-8069(98)80034-1","DOIUrl":"10.1016/S1251-8069(98)80034-1","url":null,"abstract":"<div><p>We present an analytical study of the structure of the flow of a molten alloy. The alloy is contained in a cylindrical crucible and locally heated on its free surface by an electron beam. Due to the high temperature under the electron beam, local evaporation of alloy components occurs. The difference of volatility of the two components creates a concentration gradient in the melt. The study consists of determining analytically the structure of the flow with the following approximations: the aspect ratio height over diameter of the liquid layer is small and for moderate heat supply. We show that in the first significant order, the flow pattern in the conductive regime is governed by two dimensionless numbers, a Marangoni and a Rayleigh number that measure the relative strengths of the thermal and solutal effects.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 4","pages":"Pages 251-256"},"PeriodicalIF":0.0,"publicationDate":"1998-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(98)80034-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"112346625","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
On a smooth geometric approach to the dynamics of media with microstructures 具有微观结构的介质动力学的光滑几何方法
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-04-01 DOI: 10.1016/S1251-8069(98)80030-4
Ernst Binz , Manuel de Leon , Dan Socolescu
{"title":"On a smooth geometric approach to the dynamics of media with microstructures","authors":"Ernst Binz ,&nbsp;Manuel de Leon ,&nbsp;Dan Socolescu","doi":"10.1016/S1251-8069(98)80030-4","DOIUrl":"10.1016/S1251-8069(98)80030-4","url":null,"abstract":"<div><p>In this note we show that the space of configurations of a medium with a microstructure is a principal bundle over the manifold of embeddings of the underlying macromedia. The structure group is just the group of gauge transformations. An appropriate Lagrangian function is chosen defining the dynamics of the system. The Cosserat media are considered as an example.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 4","pages":"Pages 227-232"},"PeriodicalIF":0.0,"publicationDate":"1998-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(98)80030-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"98141156","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: 6
Algorithme adaptatif de restauration d'images par les méthodes connexionnistes 连接方法的自适应图像恢复算法
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-04-01 DOI: 10.1016/S1251-8069(98)80036-5
Ahmed Roukhe, Aziz Nachit
{"title":"Algorithme adaptatif de restauration d'images par les méthodes connexionnistes","authors":"Ahmed Roukhe,&nbsp;Aziz Nachit","doi":"10.1016/S1251-8069(98)80036-5","DOIUrl":"10.1016/S1251-8069(98)80036-5","url":null,"abstract":"<div><p>The analysis of brain operations allows us to build a computational model of an artificial neural network, able to restore gray level images degraded by a shiftinvariant blur function and additive noise. Our approach for restoration is carried out using a dynamic algorithm which minimizes an energy function. We show that it is not necessary to know the blur filter.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 4","pages":"Pages 263-271"},"PeriodicalIF":0.0,"publicationDate":"1998-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(98)80036-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"98549352","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
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