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Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics最新文献

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Low-velocity friction between macroscopic solids 宏观固体之间的低速摩擦
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-07-01 DOI: 10.1016/S1296-2147(01)01212-4
Lionel Bureau, Tristan Baumberger, Christiane Caroli, Oliver Ronsin
{"title":"Low-velocity friction between macroscopic solids","authors":"Lionel Bureau,&nbsp;Tristan Baumberger,&nbsp;Christiane Caroli,&nbsp;Oliver Ronsin","doi":"10.1016/S1296-2147(01)01212-4","DOIUrl":"https://doi.org/10.1016/S1296-2147(01)01212-4","url":null,"abstract":"<div><p>We analyze the physical mechanisms taking place in unlubricated friction between surfaces of micrometric roughness at sliding speeds <span><math><mtext>&lt;100</mtext></math></span> μm<span><math><mtext>·</mtext></math></span>s<span><math><msup><mi></mi><mn>−1</mn></msup></math></span>. This analysis is based on extensive experimental investigations of the time and velocity dependences of static and dynamic friction forces, and of non-stationary sliding. It fully supports the state and rate dependent friction model first proposed by Rice and Ruina.</p></div>","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 5","pages":"Pages 699-707"},"PeriodicalIF":0.0,"publicationDate":"2001-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01212-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90125874","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: 24
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-07-01 DOI: 10.1016/S1296-2147(01)01220-3
Jean-Mary Georges (Rédacteur en chef invité / Guest editor)
{"title":"","authors":"Jean-Mary Georges (Rédacteur en chef invité / Guest editor)","doi":"10.1016/S1296-2147(01)01220-3","DOIUrl":"https://doi.org/10.1016/S1296-2147(01)01220-3","url":null,"abstract":"","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 5","pages":"Page 695"},"PeriodicalIF":0.0,"publicationDate":"2001-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01220-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91758362","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
Plasto-hydrodynamic lubrication (PHD) – application of lubrication theory to metal forming processes 塑性流体动力润滑——润滑理论在金属成形过程中的应用
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-07-01 DOI: 10.1016/S1296-2147(01)01215-X
Pierre Montmitonnet
{"title":"Plasto-hydrodynamic lubrication (PHD) – application of lubrication theory to metal forming processes","authors":"Pierre Montmitonnet","doi":"10.1016/S1296-2147(01)01215-X","DOIUrl":"10.1016/S1296-2147(01)01215-X","url":null,"abstract":"<div><p>The theory of lubrication of plastically deformed surfaces (plasto-hydrodynamics or PHD) was derived in the 60s using the advances in elasto-hydrodynamics (EHD). The transposition is described together with some applications to metal forming processes. PHD was later extended to the mixed regime, so important in metal forming. These models are surveyed. Finally, it is suggested that mixed PHD models could considerably benefit from newer algorithms and numerical techniques used in EHD and more recently in mixed-EHD.</p></div>","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 5","pages":"Pages 729-737"},"PeriodicalIF":0.0,"publicationDate":"2001-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01215-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"99437375","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
Calcul de la polarisation spontanée dans les phases ferroélectriques de BaTiO3 计算BaTiO3铁电相的自发极化
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-07-01 DOI: 10.1016/S1296-2147(01)01187-8
Ahmed Toumanari , Brahim Er-Raha , Lahsèn Lifsal , Driss Khatib , Wataru Kinase
{"title":"Calcul de la polarisation spontanée dans les phases ferroélectriques de BaTiO3","authors":"Ahmed Toumanari ,&nbsp;Brahim Er-Raha ,&nbsp;Lahsèn Lifsal ,&nbsp;Driss Khatib ,&nbsp;Wataru Kinase","doi":"10.1016/S1296-2147(01)01187-8","DOIUrl":"https://doi.org/10.1016/S1296-2147(01)01187-8","url":null,"abstract":"<div><p>The spontaneous polarization of <em>BaTiO<span><math><msub><mi></mi><mn>3</mn></msub></math></span></em> is calculated in ferroelectric phases from a microscopic model taking into account of the dipole–dipole interactions due to the local field acting on the constituent ions, where the <em>Ti</em> ions shift in the lattice having the spontaneous deformation. Our calculation shows that the spontaneous polarization increases when the temperature decreases. These theoretical results are in good agreement with the experimental data.</p></div>","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 5","pages":"Pages 781-786"},"PeriodicalIF":0.0,"publicationDate":"2001-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01187-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91724709","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
Avant-propos 前言
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-07-01 DOI: 10.1016/S1296-2147(01)01219-7
Jean-Mary Georges
{"title":"Avant-propos","authors":"Jean-Mary Georges","doi":"10.1016/S1296-2147(01)01219-7","DOIUrl":"https://doi.org/10.1016/S1296-2147(01)01219-7","url":null,"abstract":"","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 5","pages":"Pages 697-698"},"PeriodicalIF":0.0,"publicationDate":"2001-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01219-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137227592","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
Starved elastohydrodynamic lubrication theory: application to emulsions and greases 饥饿弹性流体动力润滑理论:在乳剂和润滑脂中的应用
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-07-01 DOI: 10.1016/S1296-2147(01)01208-2
Ton Lubrecht , Denis Mazuyer , Philippa Cann
{"title":"Starved elastohydrodynamic lubrication theory: application to emulsions and greases","authors":"Ton Lubrecht ,&nbsp;Denis Mazuyer ,&nbsp;Philippa Cann","doi":"10.1016/S1296-2147(01)01208-2","DOIUrl":"10.1016/S1296-2147(01)01208-2","url":null,"abstract":"<div><p>In classical fluid lubrication the film thickness is mainly determined by entrainment velocity and oil viscosity. At high pressure, elastic deformation occurs changing the local geometry: this is the <em>elastohydrodynamic lubrication regime</em> (EHL). When a limited amount of lubricant is available to the contact, a component failure due to lubricant starvation can result. A new starvation model is presented, using the amount of oil on the surfaces as the key parameter controlling starvation. It is successfully applied to describe the contacts lubricated with multi-phase fluids such as emulsions and greases, which combine starvation with a very complex rheology.</p></div>","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 5","pages":"Pages 717-728"},"PeriodicalIF":0.0,"publicationDate":"2001-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01208-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76064123","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: 38
Cinétique de l'adsorption pontante des chaı̂nes flexibles dans les milieux poreux cha的吸附动力学pontanteı̂nes柔性多孔介质
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-07-01 DOI: 10.1016/S1296-2147(01)01207-0
Pacelli L.J. Zitha
{"title":"Cinétique de l'adsorption pontante des chaı̂nes flexibles dans les milieux poreux","authors":"Pacelli L.J. Zitha","doi":"10.1016/S1296-2147(01)01207-0","DOIUrl":"https://doi.org/10.1016/S1296-2147(01)01207-0","url":null,"abstract":"<div><p>We present a phenomenological study of the bridging adsorption of flexible chains during the non-inertial flow of polymer solutions in disordered porous media. Using simple physical arguments we have established the time dependence of the concentration of the chains retained in a single pore due to the bridging adsorption. We have then shown, in the limit of vanishing desorption, that the hydrodynamic resistance scales as a function of time according to an exponential law.</p></div>","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 5","pages":"Pages 787-796"},"PeriodicalIF":0.0,"publicationDate":"2001-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01207-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91724708","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
Rough surfaces and elasto-plastic contacts 粗糙表面和弹塑性接触
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-07-01 DOI: 10.1016/S1296-2147(01)01213-6
Hassan Zahouani , François Sidoroff
{"title":"Rough surfaces and elasto-plastic contacts","authors":"Hassan Zahouani ,&nbsp;François Sidoroff","doi":"10.1016/S1296-2147(01)01213-6","DOIUrl":"10.1016/S1296-2147(01)01213-6","url":null,"abstract":"<div><p>We consider the contact between a rough surface and a smooth rigid plane. The real contact area and pressure are determined by taking into account the deformation regimes of metallic asperities. The local contact of each asperity is studied, by introducing a transitional regime between perfectly elastic and plastic extreme behaviours.</p></div>","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 5","pages":"Pages 709-715"},"PeriodicalIF":0.0,"publicationDate":"2001-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01213-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"107456857","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: 23
High contrast interference with C60 and C70 高对比度干扰C60和C70
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-06-01 DOI: 10.1016/S1296-2147(01)01189-1
M. Arndt, O. Nairz, J. Petschinka, A. Zeilinger
{"title":"High contrast interference with C60 and C70","authors":"M. Arndt,&nbsp;O. Nairz,&nbsp;J. Petschinka,&nbsp;A. Zeilinger","doi":"10.1016/S1296-2147(01)01189-1","DOIUrl":"10.1016/S1296-2147(01)01189-1","url":null,"abstract":"<div><p>We report on fullerene interference experiments using the two abundant fullerenes C<span><math><msub><mi></mi><mn>60</mn></msub></math></span> and C<span><math><msub><mi></mi><mn>70</mn></msub></math></span>. Compared to previous experiments the detected molecular flux has been improved by about an order of magnitude. This now permits either a better collimation or a velocity selection. In both cases, demonstrated here, we see a good improvement of the interference contrast for both fullerene species. In the case of C<span><math><msub><mi></mi><mn>60</mn></msub></math></span> the interference minima go down to the background level — indicating almost perfect coherence.</p></div>","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 4","pages":"Pages 581-585"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01189-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74696545","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: 17
Evaporative cooling of cesium atoms in the gravito-optical surface trap 重力光学表面阱中铯原子的蒸发冷却
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-06-01 DOI: 10.1016/S1296-2147(01)01193-3
M. Hammes, D. Rychtarik, R. Grimm
{"title":"Evaporative cooling of cesium atoms in the gravito-optical surface trap","authors":"M. Hammes,&nbsp;D. Rychtarik,&nbsp;R. Grimm","doi":"10.1016/S1296-2147(01)01193-3","DOIUrl":"10.1016/S1296-2147(01)01193-3","url":null,"abstract":"<div><p>We report on cooling of an atomic cesium gas closely above an evanescent-wave atom mirror. Our first evaporation experiments show a temperature reduction from 10 μK down to 300 nK along with a gain in phase-space density of almost two orders of magnitude. In a series of measurements of heating and spin depolarization an incoherent background of resonant photons in the evanescent-wave diode laser light was found to be the limiting factor at this stage.</p></div>","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 4","pages":"Pages 625-631"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01193-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86352575","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
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