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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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Pseudo-equilibrium between a random system and a solution: a Monte-Carlo study of glass dissolution in water 随机系统和溶液之间的伪平衡:玻璃在水中溶解的蒙特卡罗研究
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-02-01 DOI: 10.1016/S1251-8069(99)80075-X
Sitangsu Bikas Santra, Bernard Sapoval, Philippe Barboux, François Devreux
{"title":"Pseudo-equilibrium between a random system and a solution: a Monte-Carlo study of glass dissolution in water","authors":"Sitangsu Bikas Santra,&nbsp;Bernard Sapoval,&nbsp;Philippe Barboux,&nbsp;François Devreux","doi":"10.1016/S1251-8069(99)80075-X","DOIUrl":"10.1016/S1251-8069(99)80075-X","url":null,"abstract":"<div><p>The dissolution of a random binary glass with strongly different solubilities is studied by Monte-Carlo simulations in two dimensions. The soluble species represents Na<sub>2</sub>O or B<sub>2</sub>O<sub>3</sub>. The other species, SiO<sub>2</sub>, has a local environment-dependent solubility. For a finite volume of liquid a rapid dissolution is found until an apparent equilibrium is reached. Nevertheless, a steady state porosification continues at a lower but constant speed with restructuration of the porous surface. The simulation reproduces the restarting of dissolution at apparent equilibrium, recently observed experimentally. Dynamical percolation permits us to explain the strong dependence of the dissolution rate on the concentration.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 2","pages":"Pages 129-134"},"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)80075-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"99112920","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: 7
Étude numérique de la dispersion des particules lourdes dans une couche limite turbulente 湍流边界层中重粒子散射的数值研究
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-02-01 DOI: 10.1016/S1251-8069(99)80071-2
Jana Vyhnalikova , Daniel Huilier, Henri Burnage
{"title":"Étude numérique de la dispersion des particules lourdes dans une couche limite turbulente","authors":"Jana Vyhnalikova ,&nbsp;Daniel Huilier,&nbsp;Henri Burnage","doi":"10.1016/S1251-8069(99)80071-2","DOIUrl":"https://doi.org/10.1016/S1251-8069(99)80071-2","url":null,"abstract":"<div><p>The aim of this paper is to present modifications brought to a standard Lagrangian model for turbulent dispersion so that the forces acting on a heavy particle in a turbulent boundary layer can be taken into account. A satisfying validation of this modified model for Lagrangian trajectography is then obtained and compared with the experimental results of Tanière et al. performed in the boundary layer of a wind tunnel.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 2","pages":"Pages 103-110"},"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)80071-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91761604","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
Stabilité linéaire de l'écoulement de Poiseuille en conduite cylindrique viscoélastique 粘弹性圆柱管中鱼流的线性稳定性
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-02-01 DOI: 10.1016/S1251-8069(99)80070-0
Mahmoud Hamadiche , Marwan Al-Farkh
{"title":"Stabilité linéaire de l'écoulement de Poiseuille en conduite cylindrique viscoélastique","authors":"Mahmoud Hamadiche ,&nbsp;Marwan Al-Farkh","doi":"10.1016/S1251-8069(99)80070-0","DOIUrl":"https://doi.org/10.1016/S1251-8069(99)80070-0","url":null,"abstract":"<div><p>The stability of Hagen-Poiseuille flow in a viscoelastic tube is determined using a linear stability analysis. It is found that such a flow is unstable, while the Hagen-Poiseuille flow is stable, as is well known. In this paper, we study the instability arising from an axisymmetric disturbance. The neutrality curves in several planes formed by the physical parameters of the problem are plotted. In particular, the effect of the Reynolds number, which was neglected in previous work, is examined. Particular attention is payed to the effect of the viscosity of the viscoelastic tube.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 2","pages":"Pages 95-102"},"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)80070-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91761606","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
Contribution à la modélisation du remodelage de Pos trabéculaire 对小梁后重塑模型的贡献
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-02-01 DOI: 10.1016/S1251-8069(99)80074-8
Mustapha Zidi
{"title":"Contribution à la modélisation du remodelage de Pos trabéculaire","authors":"Mustapha Zidi","doi":"10.1016/S1251-8069(99)80074-8","DOIUrl":"https://doi.org/10.1016/S1251-8069(99)80074-8","url":null,"abstract":"<div><p>As an adapted, adaptable and optimized structure, the bone architecture modified itself by bone formation or resorption. The aim of this note is to generalize and to study the stability of an analytical and unidimensional model of this bone remodeling phenomena. The evolutive equations are solved by the finite difference method and heterogenous spatial organisations like that of the trabecular bone have been obtained.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 2","pages":"Pages 121-128"},"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)80074-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91761603","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
Résolution des équations de Navier-Stokes dans la formulation en variables primitives par approximation diffuse 用扩散近似求解原始变量公式中的Navier-Stokes方程
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-02-01 DOI: 10.1016/S1251-8069(99)80073-6
Stéphane Couturier, Hamou Sadat
{"title":"Résolution des équations de Navier-Stokes dans la formulation en variables primitives par approximation diffuse","authors":"Stéphane Couturier,&nbsp;Hamou Sadat","doi":"10.1016/S1251-8069(99)80073-6","DOIUrl":"10.1016/S1251-8069(99)80073-6","url":null,"abstract":"<div><p>A diffuse approximation method for solving Navier-Stokes equations in primitive variables is proposed. The results of a numerical example show the accuracy and efficiency of this approach.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 2","pages":"Pages 117-119"},"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)80073-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"93352157","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
Monitoring of temperature anomalies in the former Semipalatinsk nuclear test site 对前塞米巴拉金斯克核试验场温度异常的监测
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-02-01 DOI: 10.1016/S1251-8069(99)80076-1
Umirzak M. Sultangazin, Edige A. Zakarin, Lev F. Spivak, Oleg P. Arkhipkin, Nadiya R. Muratova, Alexei G. Terehov
{"title":"Monitoring of temperature anomalies in the former Semipalatinsk nuclear test site","authors":"Umirzak M. Sultangazin,&nbsp;Edige A. Zakarin,&nbsp;Lev F. Spivak,&nbsp;Oleg P. Arkhipkin,&nbsp;Nadiya R. Muratova,&nbsp;Alexei G. Terehov","doi":"10.1016/S1251-8069(99)80076-1","DOIUrl":"10.1016/S1251-8069(99)80076-1","url":null,"abstract":"<div><p>The Space Research Institute of the Ministry of Science, Academy of Sciences of Kazakstan, monitors the territory of Kazakstan using the NOAA satellite data. This year, significant anomalies in the distribution of snow cover and underlying surface temperature have been detected in the region of the former Semipalatinsk nuclear test site (SNTS).</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 2","pages":"Pages 135-140"},"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)80076-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"109711621","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 de métallicité sur la relation période-luminosité des céphéeides et H0 金属含量对cepheides和H0的周期-光度关系的影响
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-02-01 DOI: 10.1016/S1251-8069(99)80077-3
Jean-Phillipe Beaulieu
{"title":"Effet de métallicité sur la relation période-luminosité des céphéeides et H0","authors":"Jean-Phillipe Beaulieu","doi":"10.1016/S1251-8069(99)80077-3","DOIUrl":"10.1016/S1251-8069(99)80077-3","url":null,"abstract":"<div><p>In the first article, we presented a review on the Cepheid PL relation as a tool formeasuring distances, and showed the sensitivity of the method to metallicity.Accounting for it brings the recent differing estimates of <em>H</em><sub>0</sub> into agreement.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 2","pages":"Pages 141-152"},"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)80077-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"102737205","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 sur la forme d'un tas de billes dans un silo bidimensionnel 二维筒仓中一堆球的形状研究
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-01-01 DOI: 10.1016/S1251-8069(97)86954-0
Yan Grasselli , Hans Herrmann
{"title":"Étude sur la forme d'un tas de billes dans un silo bidimensionnel","authors":"Yan Grasselli ,&nbsp;Hans Herrmann","doi":"10.1016/S1251-8069(97)86954-0","DOIUrl":"10.1016/S1251-8069(97)86954-0","url":null,"abstract":"<div><p>We experimentally confirm an expression derived by Boutreux and de Gennes for the shape of a granular pile filling a two-dimensional silo. The analytical formula is retrieved from a model of kinks using the vertical translational invariance of the heap surface. We also look at the dependence of the shape on the energy of the particles poured into the cell.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 1","pages":"Pages 61-67"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(97)86954-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92567388","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
A new mixed AUSM+ Liou scheme: an extension of the mixed Van Leer flux splitting 一种新的混合AUSM+ Liou格式:混合Van Leer通量分裂的扩展
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-01-01 DOI: 10.1016/S1251-8069(97)86946-1
Pascal Ferrand, Stéphane Aubert
{"title":"A new mixed AUSM+ Liou scheme: an extension of the mixed Van Leer flux splitting","authors":"Pascal Ferrand,&nbsp;Stéphane Aubert","doi":"10.1016/S1251-8069(97)86946-1","DOIUrl":"10.1016/S1251-8069(97)86946-1","url":null,"abstract":"<div><p>The upwind schemes are well suited to inviscid transonic flow but not to viscous flow. It is the opposite for central schemes. This paper presents a new approach which combines the central scheme and the upwind scheme. Liou's flux splitting is selected to define this new mixed AUSM<sup>+</sup> Liou scheme. The results, obtained on supersonic viscous configuration, are compared to other schemes' results and to semi-empirical results. These calculations show the benefit of the present approach.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 1","pages":"Pages 5-11"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(97)86946-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"102625751","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
Contrôle optimal par rétroaction de la transparence acoustique d'une plaque munie de transducteurs piézo-électriques 通过反馈对压电换能器板的声透明度进行最佳控制
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-01-01 DOI: 10.1016/S1251-8069(97)86952-7
Emmanuel Friot
{"title":"Contrôle optimal par rétroaction de la transparence acoustique d'une plaque munie de transducteurs piézo-électriques","authors":"Emmanuel Friot","doi":"10.1016/S1251-8069(97)86952-7","DOIUrl":"10.1016/S1251-8069(97)86952-7","url":null,"abstract":"<div><p>This note deals with optimal control with piezoelectric devices for a radiating structure excited by an unknown acoustic field. A state-space model is first identified from the Frequency Response Functions measured between the actuators and the sensors, a Linear Quadratic Gaussian controller is then synthesized to minimize a relevant acoustic index. Real-time optimal control was implemented and applied to a radiating plate enclosing a reverberant cavity.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 1","pages":"Pages 47-54"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(97)86952-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"95970676","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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