Journal De Physique最新文献_第7页

High Resolution Spectroscopy of the Hydrogen Atom. I. Method and Experiment 氢原子的高分辨率光谱。一、方法与实验

Journal De Physique Pub Date : 1990-10-01 DOI: 10.1051/JPHYS:0199000510200226300

J. Garreau, M. Allegrini, L. Julien, F. Biraben

引用次数: 20

Dynamics of freely suspended films with surface tension 具有表面张力的自由悬浮薄膜动力学

Journal De Physique Pub Date : 1990-10-01 DOI: 10.1051/JPHYS:0199000510190214300

Y. Marathe, S. Ramaswamy

引用次数: 2

Analytical models of transient thermoelastic deformations of mirrors heated by high power cw laser beams 高功率连续波激光束加热反射镜瞬态热弹性变形的分析模型

Journal De Physique Pub Date : 1990-10-01 DOI: 10.1051/JPHYS:0199000510200224300

P. Hello, J. Vinet

引用次数: 65

High resolution spectroscopy of the hydrogen atom. II, Study of line profiles 氢原子的高分辨光谱。二、线条轮廓的研究

Journal De Physique Pub Date : 1990-10-01 DOI: 10.1051/JPHYS:0199000510200227500

J. Garreau, M. Allegrini, L. Julien, F. Biraben

引用次数: 16

Surface melting of deuterium hydride thick films 氢化氘厚膜的表面熔化

Journal De Physique Pub Date : 1990-09-01 DOI: 10.1051/JPHYS:0199000510170192900

P. Zeppenfeld, M. Bienfait, Feng Liu, O. Vilches, G. Coddens

{"title":"Surface melting of deuterium hydride thick films","authors":"P. Zeppenfeld, M. Bienfait, Feng Liu, O. Vilches, G. Coddens","doi":"10.1051/JPHYS:0199000510170192900","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510170192900","url":null,"abstract":"Quasi-elastic neutron scattering has been used to measure, below the bulk melting temperature, the thickness and the diffusion coefficient of the mobile surface layer of 8 and 10 layer thick films of deuterium hydride (HD) condensed on MgO(100). The measurements show that the close-packed surface of solid HD surface melts gradually, with the thickness of the melted layer increasing from 0.5 to 6 molecular layers as the temperature rises from 4 K to 0.05 K below the bulk melting temperature. The diffusion coefficients are in the 10 −5 cm 2 s −1 range indicating that the surface disordered film is liquid-like Nous avons utilise la diffusion quasi-elastique de neutrons pour mesurer, en dessous de la temperature de fusion, l'epaisseur et le coefficient de diffusion de la couche mobile de surface de films d'epaisseur 8 et 10 couches moleculaires d'hydrure de deuterium (HD) condenses sur MgO(100). Les mesures montrent que la surface compacte de HD solide subit une prefusion avec une epaisseur de la couche fondue variant de 0.5 a 6 couches moleculaires dans le domaine de temperatures s'etendant de 4 K a 0.05 K en dessous du point de fusion (16.604 K). Les coefficients de diffusion tombent dans le domaine des 10 −5 cm 2 s −1 , ce qui indique que la couche de surface desordonnee se comporte comme un liquide","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"23 1","pages":"1929-1938"},"PeriodicalIF":0.0,"publicationDate":"1990-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84341187","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: 12

Etude théorique et expérimentale des propriétés gyrométriques d'un oscillateur à mélange à quatre ondes en anneau 四波环混合振荡器陀螺特性的理论与实验研究

Journal De Physique Pub Date : 1990-09-01 DOI: 10.1051/JPHYS:0199000510180205100

M. Pinard, M. Vallet, G. Grynberg

{"title":"Etude théorique et expérimentale des propriétés gyrométriques d'un oscillateur à mélange à quatre ondes en anneau","authors":"M. Pinard, M. Vallet, G. Grynberg","doi":"10.1051/JPHYS:0199000510180205100","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510180205100","url":null,"abstract":"We present a theoretical and experimental study of the steady-state regime of a ring four-wave mixing oscillator. We study here the properties of the quasi-degenerate mode. The theory is developped using the Lamb equations. We show that the four-wave mixing oscillator can be used as a gyrometer and that its scale factor is identical to the gyrolaser scale factor. We calculate the lock-in band, which is due to backscattering on the mirrors, and show that an intrinsic non-linearity can be used to circumvent this problem by optical means only. Finally we describe the experiments we have performed using sodium vapor to observe these gyrometric properties Nous etudions les proprietes d'un oscillateur en anneau utilisant le melange a quatre ondes dans une vapeur atomique comme processus de gain. Notre etude concerne ici le mode de fonctionnement quasi degenere. L'etude theorique est faite au moyen des equations de Lamb. Nous montrons que le systeme se comporte comme un gyrometre et que son facteur d'echelle est identique a celui des gyrolasers. Nous calculons la zone aveugle de ce gyrometre, zone aveugle qui est due a la retrodiffusion sur les miroirs. Nous montrons aussi que l'utilisation d'une nonlinearite intrinseque permet de s'affranchir du probleme de la zone aveugle par un moyen purement optique. Finalement nous decrivons les experiences faites en utilisant une vapeur de sodium qui nous ont permis de mettre en evidence ces proprietes gyrometriques","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"38 1","pages":"2051-2072"},"PeriodicalIF":0.0,"publicationDate":"1990-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89600532","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

Etude par frottement intrieur et impdance complexe d'une zircone calcie cubique ZrO2-CaO 用摩擦和复杂阻抗研究立方氧化锆ZrO2-CaO

Journal De Physique Pub Date : 1990-09-01 DOI: 10.1051/JPHYS:0199000510170197900

S. Pelaud, P. Mazot, J. Woirgard

{"title":"Etude par frottement intrieur et impdance complexe d'une zircone calcie cubique ZrO2-CaO","authors":"S. Pelaud, P. Mazot, J. Woirgard","doi":"10.1051/JPHYS:0199000510170197900","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510170197900","url":null,"abstract":"Internal friction measurements and complex impedance experiments have been performed on single crystal specimens of cubic stabilized zirconia. The frequency spectra observed for different temperatures, by internal friction and dielectric loss, give similar activation energies (1.29 and 1.26 eV), while the value obtained by D.C. conductivity is lightly higher (1.34 eV). Thus, it can be assumed that the oxygen jumps induced by mechanical or electrical sollicitation are very probably the same; the relaxation times deduced from the two sollicitation modes are effectively in a 3 ratio, in a good agreement with Nowick's theoretical approach L'etude en frequence des spectres obtenus a differentes temperatures en frottement interieur et en pertes dielectriques permet la mise en evidence, par les deux methodes, d'energies d'activation tres similaires (1,29 et 1,26 eV), l'energie obtenue pour la conductivite en courant continu etant legerement superieure (1,34 eV). On peut conclure que les mecanismes de saut de l'oxygene induits sous contrainte mecanique ou electrique sont tres vraisemblablement identiques; les temps de relaxation limites mesures par les deux methodes sont en effet dans un rapport de l'ordre de 3 proche des previsions theoriques de Nowick","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"69 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1990-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90638525","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

Static and dynamic evidence for a transition at Tc = 0 in the Ising spin glass Fe0.3Mg0.7Cl2 Ising自旋玻璃Fe0.3Mg0.7Cl2在Tc = 0处发生跃迁的静态和动态证据

Journal De Physique Pub Date : 1990-09-01 DOI: 10.1051/JPHYS:0199000510170191100

J. Redoulès, R. Bendaoud, A. Fert, D. Bertrand, J. Vétel, J. Lasjaunias, J. Souletie, J. Ferré

{"title":"Static and dynamic evidence for a transition at Tc = 0 in the Ising spin glass Fe0.3Mg0.7Cl2","authors":"J. Redoulès, R. Bendaoud, A. Fert, D. Bertrand, J. Vétel, J. Lasjaunias, J. Souletie, J. Ferré","doi":"10.1051/JPHYS:0199000510170191100","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510170191100","url":null,"abstract":"The critical behaviour of the Ising spin glass Fe 0.3 Mg 0.7 Cl 2 has been studied by d.c. magnetisation, a.c. susceptibility and specific heat measurements. We have extended the range of our previous a.c. susceptibility measurements down to 0.02 Hz by using a new set up which utilises the possibilities of a 16 bit analog to digital converter. The relaxation time τ and the coefficients a 3 and a 5 of the non linear susceptibilities are powers of each other and diverge like exponential functions of θ/T. This confirms our former statement that Fe 0.3 Mg 0.7 Cl 2 is of a class different from that of traditional 3d systems and appears as an example of a real 2d Ising spin glass with T c =0. We claim that the essential L'etude du comportement critique du verre de spin Ising Fe 0.3 Mg 0.7 a ete realisee a l'aide de mesures d'aimantation, de susceptibilite alternative et de chaleur specifique. Les mesures de susceptibilite alternative ont ete effectuees jusqu'a de tres basses frequences (0.02Hz<f<3000Hz) grâce a la mise au point d'un dispositif experimental utilisant un convertisseur analogique numerique 16 bits rapide. Le temps de relaxation τ comme les coefficients a 3 et a 5 de la susceptibilite non lineaire sont puissances l'un de l'autre et divergent comme des exponentielles de θ/T. L'analyse des resultats confirme donc les conclusions d'une premiere etude du comportement critique dynamique : Fe 0.30 Mg 0.70 Cl 2 appartient a une classe d'universalite differente des systemes 3d et apparait comme exemple de verre de spin 2d Ising caracterise par une transition de phase a T c =0. Nous affirmons que les singularites observees apparaissent comme la limite naturelle a T c =0 des lois habituelles de «scaling». Nous nous differencions sur ce point des analyses presentees recemment pour d'autres systemes, ou un comportement semblable est interprete par une theorie ad hoc pour T c =0","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"28 1","pages":"1911-1928"},"PeriodicalIF":0.0,"publicationDate":"1990-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82921190","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

Pattern recognition in Hopfield type networks with a finite range of connections 有限连接范围Hopfield型网络的模式识别

Journal De Physique Pub Date : 1990-09-01 DOI: 10.1051/JPHYS:0199000510170179700

Eva Koscielny-Bunde

引用次数: 2

Structural characterization of krypton physisorption on (0001) graphite pre-plated with cyclohexane 预镀环己烷(0001)石墨上氪物理吸附的结构表征

Journal De Physique Pub Date : 1990-09-01 DOI: 10.1051/JPHYS:0199000510170196100

A. Razafitianamaharavo, P. Convert, J. Coulomb, B. Croset, N. Dupont-Pavlovsky

引用次数: 16