Journal De Physique最新文献_第9页

Comparison of two expressions to compute the electronic energy of a crystal 计算晶体电子能量的两个表达式的比较

Journal De Physique Pub Date : 1990-09-01 DOI: 10.1051/JPHYS:0199000510180201100

Š. Pick

引用次数: 5

Birefringence study of the irreversible behavior of the incommensurate phase of quartz: effects of chemical impurities 石英不对称相不可逆行为的双折射研究:化学杂质的影响

Journal De Physique Pub Date : 1990-09-01 DOI: 10.1051/JPHYS:0199000510170193900

F. Mogeon, G. Dolino

{"title":"Birefringence study of the irreversible behavior of the incommensurate phase of quartz: effects of chemical impurities","authors":"F. Mogeon, G. Dolino","doi":"10.1051/JPHYS:0199000510170193900","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510170193900","url":null,"abstract":"A systematic study of the variations of the irreversible properties of the incommensurate phase of quartz has been performed by birefringence measurements in 9 samples (either synthetic or natural) of various compositions determined by chemical analysis and infrared spectroscopy. The shift of the α-β transition temperature for large impurity concentrations has been verified. The properties of the incommensurate phase are very sensitive to small changes of impurity contents: a global hysteresis going from 10 to 220 mK has been correlated to the OH infrared absorption. Time dependent pinning steps and memory effects have been observed showing the importance of mobile impurities. Finally a regime of discontinuous variation of physical properties appears for slow rate of temperature variations. Thes Une etude systematique des proprietes irreversibles de la phase incommensurable du quartz a ete faite par des mesures de birefringence sur 9 echantillons (synthetiques ou naturels) de differentes compositions, determinees par analyse chimique et spectroscopie infrarouge. Les decalages de la temperature de la transition α-β, produits par des concentrations importantes d'impuretes ont ete mesures. Les proprietes de la phase incommensurable sont tres sensibles a la presence de faibles taux d'impuretes: des hysteresis globales variant de 10 a 220 mK, ont ete mesurees et une correlation avec l'absorption infrarouge due aux liaisons OH a ete trouvee. Des effets dependant du temps tels que des marches d'accrochages et des effets memoires ont ete observes, montrant l'importance des defauts mobiles. Enfin, un regime de variations discontinues des proprietes physiques apparait pour les petites vitesses de variation de la temperature. Les resultats de ces experiences ont ete compares a diverses predictions theoriques, telles que celles de la theorie des Ondes de Densite des Defauts dues a la diffusion des impuretes mobiles","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"34 1","pages":"1939-1960"},"PeriodicalIF":0.0,"publicationDate":"1990-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89667898","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: 8

Diffusing-wave spectroscopy : dynamic light scattering in the multiple scattering limit 扩散波光谱学:在多重散射极限下的动态光散射

Journal De Physique Pub Date : 1990-09-01 DOI: 10.1051/JPHYS:0199000510180210100

D. Pine, D. Weitz, J. Zhu, E. Herbolzheimer

{"title":"Diffusing-wave spectroscopy : dynamic light scattering in the multiple scattering limit","authors":"D. Pine, D. Weitz, J. Zhu, E. Herbolzheimer","doi":"10.1051/JPHYS:0199000510180210100","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510180210100","url":null,"abstract":"Dynamic light scattering is extended to optically thick (opaque) media which exhibit a very high degree of multiple scattering. This new technique, called diffusing-wave spectroscopy (DWS), exploits the diffusive nature of the transport of light in strongly scattering media to relate the temporal fluctuations of the multiply scattered light to the motion of the scatterers. A simple theory of DWS, based on the diffusion approximation for the transport of light, is developed to calculate the temporal electric field autocorrelation functions of the multiply scattered light. Two important scattering geometries are treated : transmission and backscattering. The theory is compared to experimental measurements of Brownian motion of submicron-diameter polystyrene spheres in aqueous suspension. The agreement between theory and experiment is excellent. The limitations of the photon diffusion approximation and the polarization dependence of the autocorrelation functions are discussed for the backscattering measurements. The effects of absorption of light and particle polydispersity are also incorporated into the theory and verified experimentally. It is also shown how DWS can be used to obtain information about the mean size of the particles which scatter light.","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"18 1","pages":"2101-2127"},"PeriodicalIF":0.0,"publicationDate":"1990-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75401256","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: 252

On the glassy nature of random directed polymers in two dimensions 二维随机定向聚合物的玻璃性质

Journal De Physique Pub Date : 1990-09-01 DOI: 10.1051/JPHYS:0199000510170183100

M. Mézard

引用次数: 72

Low temperature behaviour of 3-D spin glasses in a magnetic field 三维自旋玻璃在磁场中的低温行为

Journal De Physique Pub Date : 1990-09-01 DOI: 10.1051/JPHYS:0199000510170187700

S. Caracciolo, Giorgio Parisi, S. Patarnello, N. Sourlas

{"title":"Low temperature behaviour of 3-D spin glasses in a magnetic field","authors":"S. Caracciolo, Giorgio Parisi, S. Patarnello, N. Sourlas","doi":"10.1051/JPHYS:0199000510170187700","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510170187700","url":null,"abstract":"We present the results of two sets of numerical simulations of 3-d Ising spin-glasses in the presence of an uniform magnetic field. In the first set, among other quantities, we compute the spin-spin overlap probability distribution P(q), the link-link overlap probability distribution P e (q e ) and the spin-glass susceptibility χ SG for different volumes and temperatures. The results are in good agreement with mean-field behaviour: P(q) and P e (q e ) are non trivial and non self-averaging and χ SG shows an increase with the linear size L of the system as χ SG ∼Lω. Our estimate is ω=1,8±0.25 at T=0.83. In the second set of simulations a small coupling ∈ is introduced between two copies of the system and the copy overlap Q(e) is computed as a function of e. Q(e) becomes steeper around e∼0 as L increases, in agreement with the previous set of simulations. Our data seem anyhow incompatible with the alternatives to mean-field theory proposed so far Nous presentons les resultats de deux ensembles de simulations numeriques de verres de spins d'Ising tridimensionnels en presence d'un champ magnetique. Dans le premier ensemble nous calculons, entre autres quantites, la distribution de probabilite du recouvrement des configurations des spins P (q), la distribution de probabilite du recouvrement des configurations des liens P e (q e ) et la susceptibilite verre de spin X SG pour differents volumes et temperatures. Les resultats sont en bon accord avec la theorie du champ moyen: P(q) et P e (q e ) sont non triviaux et non automoyennants et χ SG augmente avec la taille lineaire L du systeme comme χ SG ∼Lω. Nous estimons ω=1,8±0,25 a T=0,83. Dans le deuxieme ensemble de simulations nous introduisons un petit couplage e entre deux copies du systeme et leur recouvrement Q (e) est calcule en fonction d'e• La pente de Q(e) a l'origine augmente avec L, en accord avec les autres simulations","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"58 1","pages":"1877-1895"},"PeriodicalIF":0.0,"publicationDate":"1990-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84867502","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: 33

Editorial - Forthcoming Changes to the Journal de Physique 社论-即将到来的变化的杂志de体质

Journal De Physique Pub Date : 1990-09-01 DOI: 10.1051/JPHYS:0199000510170178100

D. Jérome

引用次数: 0

On the molecular-dynamics study of a phase transition in a quasicrystal model 准晶体模型相变的分子动力学研究

Journal De Physique Pub Date : 1990-09-01 DOI: 10.1051/JPHYS:0199000510170179100

K. Parlinski, E. Denoyer, M. Lambert

引用次数: 2

Déplacement par le xénon, du film d'hexafluorure de soufre préalablement adsorbé sur la face (0001) du graphite 用氙取代先前吸附在石墨表面(0001)的六氟化硫薄膜

Journal De Physique Pub Date : 1990-09-01 DOI: 10.1051/JPHYS:0199000510170198700

J. Menaucourt, C. Bockel

引用次数: 21

1D stereological cuts: application to sligthly sintered model materials 1D立体切割:适用于微烧结模型材料

Journal De Physique Pub Date : 1990-09-01 DOI: 10.1051/JPHYS:0199000510170189700

M. Lichtenberg, L. Oger, A. Gervois

引用次数: 0

Electromagnetic interaction of vortices in layered superconducting structures 层状超导结构中涡旋的电磁相互作用

Journal De Physique Pub Date : 1990-09-01 DOI: 10.1051/JPHYS:0199000510170197100

A. Buzdin, D. Feinberg

引用次数: 65