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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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Réactivité d'hydrures de tantalocène : insertion du soufre dans la liaison tantale-hydrogène 钽氢化物的反应性:硫插入钽氢键
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1997-11-01 DOI: 10.1016/S1251-8069(97)88174-2
André Sadorge, Philippe Sauvageot, Jean-Claude Leblanc, Claude Moïse
{"title":"Réactivité d'hydrures de tantalocène : insertion du soufre dans la liaison tantale-hydrogène","authors":"André Sadorge,&nbsp;Philippe Sauvageot,&nbsp;Jean-Claude Leblanc,&nbsp;Claude Moïse","doi":"10.1016/S1251-8069(97)88174-2","DOIUrl":"10.1016/S1251-8069(97)88174-2","url":null,"abstract":"<div><p>In the course of our research concerning the reactivity of tantalocene hydrides towards elemental sulfur, the synthesis of monosulphurated complexes by a sulfur insertion reaction into the <em>Ta-H</em> bond is reported. Some information on the mechanistic pathway for the formation of the disulfide complexes and the synthesis of <em>Cp′<sub>2</sub>Ta(CO)(SH)</em> is given.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"325 10","pages":"Pages 593-597"},"PeriodicalIF":0.0,"publicationDate":"1997-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(97)88174-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"110888054","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
Conditions de transmission pour les jonctions de plaques minces 薄板接头的传输条件
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1997-11-01 DOI: 10.1016/S1251-8069(97)88170-5
Isabelle Titeux , Évariste Sanchez-Palencia
{"title":"Conditions de transmission pour les jonctions de plaques minces","authors":"Isabelle Titeux ,&nbsp;Évariste Sanchez-Palencia","doi":"10.1016/S1251-8069(97)88170-5","DOIUrl":"10.1016/S1251-8069(97)88170-5","url":null,"abstract":"<div><p>This note is concerned with junctions of thin plates. The junction is made by a slender rod made of material with low rigidity with respect to that of the plates, allowing a variation of the angle between them. A macroscopic study is not sufficient to obtain all transmission conditions. A local tridimensional study is necessary. We prove then that not only the variation of the angle between the two plates, but also the sliding of one plate with respect to the other must be taken into account to the same order. Thus the behavior of the junction is completely determined.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"325 10","pages":"Pages 563-570"},"PeriodicalIF":0.0,"publicationDate":"1997-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(97)88170-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"98177538","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
Influence des contraintes sur les propriétés élastiques de surface du gypse sondées par microscopie à force atomique 用原子力显微镜探测应力对石膏表面弹性性能的影响
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1997-11-01 DOI: 10.1016/S1251-8069(97)88172-9
Éric Finot , Éric Lesniewska , Jean-Pierre Goudonnet , Jean-Claude Mutin
{"title":"Influence des contraintes sur les propriétés élastiques de surface du gypse sondées par microscopie à force atomique","authors":"Éric Finot ,&nbsp;Éric Lesniewska ,&nbsp;Jean-Pierre Goudonnet ,&nbsp;Jean-Claude Mutin","doi":"10.1016/S1251-8069(97)88172-9","DOIUrl":"10.1016/S1251-8069(97)88172-9","url":null,"abstract":"<div><p>This paper introduces a new approach to studying the effects of lateral stress on surface elasticity. Recent results in the force modulation with an atomic force microscope (AFM) on the (010) gypsum face are presented and discussed. At the atomic level, the images in the contact mode differ from those mapping the elasticity. At the microscopic level, the images of elasticity vary according to the stress applied to the sample. Without stress, the surface stiffness is uniform. However, a lateral stress induces slipping and shearing processes.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"325 10","pages":"Pages 577-586"},"PeriodicalIF":0.0,"publicationDate":"1997-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(97)88172-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113507959","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
Crystal structure of 1,3,5-trimethyl-2,4,6-trinitrobenzene, trisubstituted picryl group 1,3,5-三甲基-2,4,6-三硝基苯三取代吡啶基的晶体结构
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1997-11-01 DOI: 10.1016/S1251-8069(97)88175-4
Antoine Hardy, François Gérard, Abdou Soilihi, Kamran Ahmadi, Anne-Marie Hardy
{"title":"Crystal structure of 1,3,5-trimethyl-2,4,6-trinitrobenzene, trisubstituted picryl group","authors":"Antoine Hardy,&nbsp;François Gérard,&nbsp;Abdou Soilihi,&nbsp;Kamran Ahmadi,&nbsp;Anne-Marie Hardy","doi":"10.1016/S1251-8069(97)88175-4","DOIUrl":"10.1016/S1251-8069(97)88175-4","url":null,"abstract":"<div><p>The original structure of 1,3,5-trimethyl-2,4,6-trinitrobenzene (TNM) is composed of separate planar layers with hexagonal pseudo-symmetry, like a prismatic single crystal. These layers are parallel to (20) and the interlayer distance is greater than the standard spacing for two benzene rings. NO<sub>2</sub> group planes and the tallying benzene ring are nearly normal. This and the methyl group resonance minimize the interlayer oxygen-hydrogen distances of two symmetrical molecules in separate layers. Crystal data: triclinic, space group P, <em>a</em> = 8.268(1) Å, <em>b</em> = 8.7890(5) Å, <em>c</em> = 9.932(1) Å, α = 108.12(1)°, β= 113.25(1)°, γ = 95.19(1)°, <em>V</em>= 549.7(2) Å<sup>3</sup>, Z = 2, <em>R(F)</em>= 5.1 %, 1 822 observed reflections ¦F<sub>0</sub><sup>2</sup> &gt; 3 σ(F<sub>0</sub><sup>2</sup>)</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"325 10","pages":"Pages 599-603"},"PeriodicalIF":0.0,"publicationDate":"1997-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(97)88175-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"102556788","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
Mélange et transfert, thermique chaotique dans un écoulement 2D périodique 混合和传递，混沌热在周期性的二维流动
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1997-11-01 DOI: 10.1016/S1251-8069(97)89076-8
Jean-Christophe Leprevost, Alain Lefèvre, Jean-Pierre Brancher, Estéban Saatdjian
{"title":"Mélange et transfert, thermique chaotique dans un écoulement 2D périodique","authors":"Jean-Christophe Leprevost,&nbsp;Alain Lefèvre,&nbsp;Jean-Pierre Brancher,&nbsp;Estéban Saatdjian","doi":"10.1016/S1251-8069(97)89076-8","DOIUrl":"10.1016/S1251-8069(97)89076-8","url":null,"abstract":"<div><p>The annular region between two confocal ellipses is a new mixing geometry defined and constructed in Nancy. When the two walls are displaced following their circumference in opposite directions at constant angular velocity, the steady state streamlines show the appearance of two saddle points joined by two different streamlines, leading thus to heteroclinic trajectories. By an adequate choice of the time-periodic velocity history of the two walls, chaotic trajectories can be obtained in this Stokes flow and only a limited number of periods are necessary to mix a small amount of tracer over the entire domain. The protocol that gives the most rapid mixing is also the one that gives the highest heat transfer rate.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"325 9","pages":"Pages 519-526"},"PeriodicalIF":0.0,"publicationDate":"1997-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(97)89076-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"103291743","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 la transformée de Fourier de répliques 关于副本的傅里叶变换
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1997-11-01 DOI: 10.1016/S1251-8069(97)89077-X
Domenico M. Carlucci , Cirano de Dominicis
{"title":"Sur la transformée de Fourier de répliques","authors":"Domenico M. Carlucci ,&nbsp;Cirano de Dominicis","doi":"10.1016/S1251-8069(97)89077-X","DOIUrl":"10.1016/S1251-8069(97)89077-X","url":null,"abstract":"<div><p>The <em>Replica Fourier Transform</em> introduced previously is related to the standard definition of Fourier transforms over a group. Its use is illustrated by block-diagonalizing the eigenvalue equation of a four-replica Parisi matrix.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"325 9","pages":"Pages 527-530"},"PeriodicalIF":0.0,"publicationDate":"1997-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(97)89077-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"110647514","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
Réceptivité localisée de la couche limite 边界层的局部接受能力
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1997-11-01 DOI: 10.1016/S1251-8069(97)88171-7
Grégoire Casalis , Cédric Gouttenoire , Bruno Troff
{"title":"Réceptivité localisée de la couche limite","authors":"Grégoire Casalis ,&nbsp;Cédric Gouttenoire ,&nbsp;Bruno Troff","doi":"10.1016/S1251-8069(97)88171-7","DOIUrl":"10.1016/S1251-8069(97)88171-7","url":null,"abstract":"<div><p>An investigation of the generation of Tollmien-Schlichting waves has been carried out with the direct numerical simulation PEGASE code developed at ONERA. The latter was allowed to visualise these waves in a two-dimensional incompressible flow around a roughness element placed on a flat plate, the incoming flow having the form: <em>U<sub>∞</sub> = U<sub>0</sub>(1ɛ cos ωt)</em>. Quantitative results on the influence of ɛ, and of the dimensions h and l of the rectangular hump on these waves are obtained from a parametric study. These results show good agreement with previous experimental and theoretical studies.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"325 10","pages":"Pages 571-576"},"PeriodicalIF":0.0,"publicationDate":"1997-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(97)88171-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"102716937","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
Les observations des nuages moléculaires diffus en absorption millimétrique 分子云在毫米吸收中的扩散观测
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1997-11-01 DOI: 10.1016/S1251-8069(97)88176-6
Robert Lucas
{"title":"Les observations des nuages moléculaires diffus en absorption millimétrique","authors":"Robert Lucas","doi":"10.1016/S1251-8069(97)88176-6","DOIUrl":"10.1016/S1251-8069(97)88176-6","url":null,"abstract":"<div><p>For sensitivity reasons, absorption spectroscopy was not possible at millimeter wavelengths until recently. While emission measurements need collisional excitation of the molecular levels above the cosmic background temperature, absorption measurements are able to detect molecules in low-density regions. However, large collecting area instruments are required. In diffuse clouds, the <em>HCO<sup>+</sup></em> ion is frequently seen, more easily than the <em>CO</em> molecule. At the photodissociation transition of <em>CO</em>, around <em>N<sub>H</sub><sub>2</sub></em> ~ 10<sup>21</sup> cm<sup>−2</sup>, the <em>CO</em> column density varies at a much higher rate than the <em>HCO<sup>+</sup></em> column density, for values of <em>N<sub>HCO</sub><sup>+</sup></em> ~ 10<sup>12</sup> cm<sup>−2</sup>. The <em>HCO<sup>+</sup></em> to <em>OH</em> abundance ratio is remarkably constant (0.03 to 0.05). Other species such as <em>H<sub>2</sub>CO</em>, <em>HCN</em>, <em>HNC</em>, <em>CN</em>, <em>C<sub>2</sub>H</em>, <em>C<sub>2</sub>H<sub>2</sub></em>, <em>CS</em>, <em>SO</em>, <em>H<sub>2</sub>S</em>, can now also be studied in diffuse clouds.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"325 10","pages":"Pages 605-614"},"PeriodicalIF":0.0,"publicationDate":"1997-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(97)88176-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"97721463","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
Système intégré d'obturation automatique de préhenseurs à attraction pneumatique 集成气动抓手自动关闭系统
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1997-11-01 DOI: 10.1016/S1251-8069(97)89073-2
Stéphane Orieux, Lucien Baldas, Jean-Charles Maré
{"title":"Système intégré d'obturation automatique de préhenseurs à attraction pneumatique","authors":"Stéphane Orieux,&nbsp;Lucien Baldas,&nbsp;Jean-Charles Maré","doi":"10.1016/S1251-8069(97)89073-2","DOIUrl":"10.1016/S1251-8069(97)89073-2","url":null,"abstract":"<div><p>Vacuum prehensile systems using a set of suction cups offer many advantages. However, an important problem appears when there is no matter in front of some suction cups. Indeed the flow rate sucked up in vain induces a considerable waste of energy and the vacuum level may become insufficient for gripping. Therefore it is very useful to disconnect all the suction cups that are not being used for gripping. In this paper, we present a new solution using the sucked up flow rate to detect and to drive the closing of unused suction cups.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"325 9","pages":"Pages 495-501"},"PeriodicalIF":0.0,"publicationDate":"1997-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(97)89073-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"95851612","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 la mesure des corrélations de type concentration-vitesse en écoulement turbulent. Application à la détermination des propriétés diffusionnelles 湍流中浓度-速度相关性的测量。应用于测定扩散特性
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1997-11-01 DOI: 10.1016/S1251-8069(97)89075-6
Fabrice Lemoine, Yah Antoine, Michel Wolff, Michel Lebouché
{"title":"Sur la mesure des corrélations de type concentration-vitesse en écoulement turbulent. Application à la détermination des propriétés diffusionnelles","authors":"Fabrice Lemoine,&nbsp;Yah Antoine,&nbsp;Michel Wolff,&nbsp;Michel Lebouché","doi":"10.1016/S1251-8069(97)89075-6","DOIUrl":"10.1016/S1251-8069(97)89075-6","url":null,"abstract":"<div><p>We demonstrate a non-intrusive measurement technique, that allows the simultaneous determination of two velocity components and the concentration of a passive contaminant. This technique has been applied to the characterization of the diffusion properties of a turbulent jet.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"325 9","pages":"Pages 511-517"},"PeriodicalIF":0.0,"publicationDate":"1997-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(97)89075-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"106380108","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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