Pub Date : 1985-12-01DOI: 10.1051/JPHYSLET:0198500460240115900
I. Campbell
The relaxation processes in an Ising spin glass are discussed in terms of random walks on a closed surface in phase space. Stretched exponential behaviour appears in a simple manner and the spin glass transition is identified with a percolation threshold in eigenstate space Les processus de relaxation dans un verre de spin Ising sont discutes en termes de la marche aleatoire sur une surface fermee dans l'espace des phases. Le comportement exponentiel etire est demontre de facon simple, et la transition verre de spin est associee au seuil de percolation dans l'espace des etats propres
{"title":"Random walks on a closed loop and spin glass relaxation","authors":"I. Campbell","doi":"10.1051/JPHYSLET:0198500460240115900","DOIUrl":"https://doi.org/10.1051/JPHYSLET:0198500460240115900","url":null,"abstract":"The relaxation processes in an Ising spin glass are discussed in terms of random walks on a closed surface in phase space. Stretched exponential behaviour appears in a simple manner and the spin glass transition is identified with a percolation threshold in eigenstate space Les processus de relaxation dans un verre de spin Ising sont discutes en termes de la marche aleatoire sur une surface fermee dans l'espace des phases. Le comportement exponentiel etire est demontre de facon simple, et la transition verre de spin est associee au seuil de percolation dans l'espace des etats propres","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"13 1","pages":"1159-1162"},"PeriodicalIF":0.0,"publicationDate":"1985-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78143256","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}
Pub Date : 1985-12-01DOI: 10.1051/JPHYSLET:0198500460240115100
L. Peliti, Z. Yi-Cheng
Field theories of growth models, such as the Eden model and diffusion-limited aggregation, are introduced by means of the Doi-Grassberger-Scheunert Fock space formalism for classical objects.
{"title":"Field theory approach to the Eden model and diffusion-limited aggregation","authors":"L. Peliti, Z. Yi-Cheng","doi":"10.1051/JPHYSLET:0198500460240115100","DOIUrl":"https://doi.org/10.1051/JPHYSLET:0198500460240115100","url":null,"abstract":"Field theories of growth models, such as the Eden model and diffusion-limited aggregation, are introduced by means of the Doi-Grassberger-Scheunert Fock space formalism for classical objects.","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"2 1","pages":"1151-1157"},"PeriodicalIF":0.0,"publicationDate":"1985-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83043056","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}
Pub Date : 1985-12-01DOI: 10.1051/JPHYSLET:0198500460240119100
C. Rosenblatt, N. Zolty
The phase diagram and results from magnetic susceptibility measurements in the isotropic phase are presented for the lyotropic liquid crystal cesium perfluoro octanoate+water in the presence of an added salt CsCl. Based upon the evolution of the Cotton-Mouton coefficient and in the context of an Onsager-type calculation we speculate on the micellar conformation as a fonction of electrolyte concentration Diagramme de phase et mesures de susceptibilite magnetique de la phase perfluorooctanoate de cesium+eau en presence de sel de CsCl. Structure des micelles en fonction de la concentration d'electrolyte
{"title":"Electrolyte effects on a nearly second order nematic-isotropic phase transition in a micellar liquid crystal","authors":"C. Rosenblatt, N. Zolty","doi":"10.1051/JPHYSLET:0198500460240119100","DOIUrl":"https://doi.org/10.1051/JPHYSLET:0198500460240119100","url":null,"abstract":"The phase diagram and results from magnetic susceptibility measurements in the isotropic phase are presented for the lyotropic liquid crystal cesium perfluoro octanoate+water in the presence of an added salt CsCl. Based upon the evolution of the Cotton-Mouton coefficient and in the context of an Onsager-type calculation we speculate on the micellar conformation as a fonction of electrolyte concentration Diagramme de phase et mesures de susceptibilite magnetique de la phase perfluorooctanoate de cesium+eau en presence de sel de CsCl. Structure des micelles en fonction de la concentration d'electrolyte","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"46 1","pages":"1191-1197"},"PeriodicalIF":0.0,"publicationDate":"1985-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78548471","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}
Pub Date : 1985-12-01DOI: 10.1051/JPHYSLET:0198500460230113300
G. Creuzet, J. Cooper, F. Creuzet, D. Jérome, A. Moradpour
We report magnetoresistance measurements for single crystals of the organic conductor (TMTSF) 2 ClO 4 at pressures up to 1.5 kbars, at 1.5 K in fields up to 11.4 T along the c*-direction. It is found that both the threshold field for the onset of the spin density wave (SDW) state and the other characteristic fields, which probably represent SDW-SDW transitions, increase strongly with pressure. In addition the pressure dependence of other quantities, the anion ordering temperature, magnetoresistance and resistivity in the metallic state are briefly reported Etude experimentale sur monocristaux pour des pressions jusqu'a 1,5 kbars et des champs magnetiques jusqu'a 11,4 T, appliques selon l'axe c: le champ seuil correspondant a l'apparition de l'etat d'onde de densite de spin et tous les autres champs caracteristiques, probablement lies a des transitions entre etats d'onde de densite de spin, augmentent rapidement avec la pression. Temperature de mise en ordre des anions, magnetoresistance et resistivite dans l'etat metallique
{"title":"Pressure dependence of field induced SDW states of (TMTSF)2ClO4 from the magnetoresistance at 1.5 K","authors":"G. Creuzet, J. Cooper, F. Creuzet, D. Jérome, A. Moradpour","doi":"10.1051/JPHYSLET:0198500460230113300","DOIUrl":"https://doi.org/10.1051/JPHYSLET:0198500460230113300","url":null,"abstract":"We report magnetoresistance measurements for single crystals of the organic conductor (TMTSF) 2 ClO 4 at pressures up to 1.5 kbars, at 1.5 K in fields up to 11.4 T along the c*-direction. It is found that both the threshold field for the onset of the spin density wave (SDW) state and the other characteristic fields, which probably represent SDW-SDW transitions, increase strongly with pressure. In addition the pressure dependence of other quantities, the anion ordering temperature, magnetoresistance and resistivity in the metallic state are briefly reported Etude experimentale sur monocristaux pour des pressions jusqu'a 1,5 kbars et des champs magnetiques jusqu'a 11,4 T, appliques selon l'axe c: le champ seuil correspondant a l'apparition de l'etat d'onde de densite de spin et tous les autres champs caracteristiques, probablement lies a des transitions entre etats d'onde de densite de spin, augmentent rapidement avec la pression. Temperature de mise en ordre des anions, magnetoresistance et resistivite dans l'etat metallique","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"117 1","pages":"1133-1138"},"PeriodicalIF":0.0,"publicationDate":"1985-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86661963","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}
Pub Date : 1985-12-01DOI: 10.1051/JPHYSLET:0198500460240117300
H. Brand, H. Pleiner
We show how the recent experimental results concerning an electromechanical coupling in smectic C * can be obtained from the macroscopic dynamic equations derived by the authors. We point out that the coupling observed is a reversible dynamic cross coupling between the change in the polarization inside the layers and velocity gradients. This type of reversible cross coupling is unique to systems which possess a pseudoscalar quantity (e.g. a helix) and does not exist in nonchiral smectic C Le couplage electromecanique observe est un couplage dynamique reversible entre les variations de polarisation dans les couches et les gradients de vitesse
{"title":"Note on «new electromechanical effect in chiral smectic C liquid crystals»","authors":"H. Brand, H. Pleiner","doi":"10.1051/JPHYSLET:0198500460240117300","DOIUrl":"https://doi.org/10.1051/JPHYSLET:0198500460240117300","url":null,"abstract":"We show how the recent experimental results concerning an electromechanical coupling in smectic C * can be obtained from the macroscopic dynamic equations derived by the authors. We point out that the coupling observed is a reversible dynamic cross coupling between the change in the polarization inside the layers and velocity gradients. This type of reversible cross coupling is unique to systems which possess a pseudoscalar quantity (e.g. a helix) and does not exist in nonchiral smectic C Le couplage electromecanique observe est un couplage dynamique reversible entre les variations de polarisation dans les couches et les gradients de vitesse","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"35 1","pages":"1173-1175"},"PeriodicalIF":0.0,"publicationDate":"1985-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78543776","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}
Pub Date : 1985-12-01DOI: 10.1051/JPHYSLET:0198500460230112300
R. Almairac, M. Siali, S. Vilminot, P. Grégoire, G. Delplanque, G. Barré
Phase transitions in the solid solution (NH 4 ) 2 (BeF 4 ) 0.82 (SO 4 ) 0.18 have been studied by means of X-ray scattering. The transition sequence is particularly complicated. The incommensurate phase appears between −106°C and −120.5°C, but in the −106 to −113°C temperature range, the incommensurate superstructure is double. Moreover the so-called «lock in» phase is already present at the normal-incommensurate transition: it appears from −102.5°C. These results are briefly discussed. The possibility of inhomogeneities in the crystal is considered Etude par diffraction RX de la sequence de transition. La phase incommensurable qui va de −106°C a −120,5°C presente une surstructure incommensurable double de −106°C a −113°C. La phase de blocage apparait des −102,5°C
{"title":"Phase incommensurable dans le composé mixte (NH4) 2(BeF4)0,82(SO4)0,18","authors":"R. Almairac, M. Siali, S. Vilminot, P. Grégoire, G. Delplanque, G. Barré","doi":"10.1051/JPHYSLET:0198500460230112300","DOIUrl":"https://doi.org/10.1051/JPHYSLET:0198500460230112300","url":null,"abstract":"Phase transitions in the solid solution (NH 4 ) 2 (BeF 4 ) 0.82 (SO 4 ) 0.18 have been studied by means of X-ray scattering. The transition sequence is particularly complicated. The incommensurate phase appears between −106°C and −120.5°C, but in the −106 to −113°C temperature range, the incommensurate superstructure is double. Moreover the so-called «lock in» phase is already present at the normal-incommensurate transition: it appears from −102.5°C. These results are briefly discussed. The possibility of inhomogeneities in the crystal is considered Etude par diffraction RX de la sequence de transition. La phase incommensurable qui va de −106°C a −120,5°C presente une surstructure incommensurable double de −106°C a −113°C. La phase de blocage apparait des −102,5°C","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"19 1","pages":"1123-1131"},"PeriodicalIF":0.0,"publicationDate":"1985-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80853851","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}
Pub Date : 1985-11-01DOI: 10.1051/JPHYSLET:0198500460220104500
E. Akkermans, R. Maynard
The weak localization of waves is formulated in terms of coherent multiple scattering theory. This leads, in the backscattering direction, to an enhancement of the differential cross-section. It manifests itself macroscopically by the doubling of the backscattering intensity in a narrow cone of width φ c =λ/l•θ(Ω)/τ, where θ(Ω) is the residence time around the incident direction. The corrections to transport coefficients are then derived both in two and three dimensions in terms of φ c . An e-expansion around the lower critical dimension d c =2 is then performed and leads to a wave localization threshold for d>2 around which the critical behaviour is studied. Different kinds of experimental situations leading to the observation of this backscattering cone and critical exponents are then discussed Obtention de la localisation faible des ondes a partir d'une theorie de la diffusion multiple coherente, ce qui conduit a une augmentation de la section efficace differentielle dans la direction de retrodiffusion et, macroscopiquement, a une valeur double de l'intensite retrodiffusee dans un cone tres etroit autour de la direction d'incidence (ouverture angulaire φ c ). Corrections aux coefficients de transport a 2 et 3 dimensions a partir de φ c
用相干多重散射理论阐述了波的弱局域化。这导致，在后向散射方向，微分截面的增强。它在宏观上表现为在宽度φ c =λ/l•θ(Ω)/τ的窄锥内后向散射强度加倍，其中θ(Ω)为入射方向周围的停留时间。然后用φ c在二维和三维中推导输运系数的修正。然后在较低的临界维d c =2周围进行e展开，并导致d>2的波局部化阈值，围绕该阈值研究临界行为。然后讨论了导致该后向散射锥和临界指数观测的不同实验情况。注意局部化、局部化、局部化、局部扩散、多相干理论、局部增强、截面效率微分、反向扩散方向等。一个单一的价值，双重的强度，反向扩散，但uncone树，etrit autour的方向，入射(ouverture角角aire φ c)。对输运系数在2和3个维度上对φ c的修正
{"title":"Weak localization of waves","authors":"E. Akkermans, R. Maynard","doi":"10.1051/JPHYSLET:0198500460220104500","DOIUrl":"https://doi.org/10.1051/JPHYSLET:0198500460220104500","url":null,"abstract":"The weak localization of waves is formulated in terms of coherent multiple scattering theory. This leads, in the backscattering direction, to an enhancement of the differential cross-section. It manifests itself macroscopically by the doubling of the backscattering intensity in a narrow cone of width φ c =λ/l•θ(Ω)/τ, where θ(Ω) is the residence time around the incident direction. The corrections to transport coefficients are then derived both in two and three dimensions in terms of φ c . An e-expansion around the lower critical dimension d c =2 is then performed and leads to a wave localization threshold for d>2 around which the critical behaviour is studied. Different kinds of experimental situations leading to the observation of this backscattering cone and critical exponents are then discussed Obtention de la localisation faible des ondes a partir d'une theorie de la diffusion multiple coherente, ce qui conduit a une augmentation de la section efficace differentielle dans la direction de retrodiffusion et, macroscopiquement, a une valeur double de l'intensite retrodiffusee dans un cone tres etroit autour de la direction d'incidence (ouverture angulaire φ c ). Corrections aux coefficients de transport a 2 et 3 dimensions a partir de φ c","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"74 1","pages":"1045-1053"},"PeriodicalIF":0.0,"publicationDate":"1985-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88480783","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}
Pub Date : 1985-11-01DOI: 10.1051/JPHYSLET:0198500460210103100
A. Lapp, C. Picot, C. Strazielle
{"title":"Universalité des propriétés statiques des polymères en solution semi-diluée","authors":"A. Lapp, C. Picot, C. Strazielle","doi":"10.1051/JPHYSLET:0198500460210103100","DOIUrl":"https://doi.org/10.1051/JPHYSLET:0198500460210103100","url":null,"abstract":"","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"3 1","pages":"1031-1036"},"PeriodicalIF":0.0,"publicationDate":"1985-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83640144","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}
Pub Date : 1985-11-01DOI: 10.1051/JPHYSLET:0198500460220105500
D. Guest, L. Auvray, D. Langevin
On a effectue une etude par rayon X de microemulsions medianes (en equilibre avec de l'eau et de l'huile) realisees avec un tensioactif alkyl benzene sulfonate (SHBS). Les tailles caracteristiques de la dispersion sont notablement superieures a celles trouvees dans un autre systeme modele dans lequel le tensioactif etait un alkyl sulfate (SDS). La difference est analysee en termes de rigidite des films de tensioactif et de coefficient de partage de l'alcool entre les films et les domaines eau et huile. Les conclusions sont en faveur du modele de De Gennes, ou l'echelle de la dispersion est identifiee avec la longueur de persistance du film de tensioactif
{"title":"Persistence length measurements in middle phase microemulsions","authors":"D. Guest, L. Auvray, D. Langevin","doi":"10.1051/JPHYSLET:0198500460220105500","DOIUrl":"https://doi.org/10.1051/JPHYSLET:0198500460220105500","url":null,"abstract":"On a effectue une etude par rayon X de microemulsions medianes (en equilibre avec de l'eau et de l'huile) realisees avec un tensioactif alkyl benzene sulfonate (SHBS). Les tailles caracteristiques de la dispersion sont notablement superieures a celles trouvees dans un autre systeme modele dans lequel le tensioactif etait un alkyl sulfate (SDS). La difference est analysee en termes de rigidite des films de tensioactif et de coefficient de partage de l'alcool entre les films et les domaines eau et huile. Les conclusions sont en faveur du modele de De Gennes, ou l'echelle de la dispersion est identifiee avec la longueur de persistance du film de tensioactif","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"13 1","pages":"1055-1063"},"PeriodicalIF":0.0,"publicationDate":"1985-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90377348","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}
Pub Date : 1985-11-01DOI: 10.1051/JPHYSLET:019850046021099900
S. Roux, E. Guyon
We numerically study the degradation of the mechanical properties of a two dimensional square lattice of beams with rigid bond angles as a function of the elements removed at random (bond percolation problem). In order to limit the fluctuations due to the small sample sizes, the elastic modulus is plotted versus the electrical conductance on the same lattices. The results for weakly and strongly degraded lattices are consistent with EMA and mechanical percolation results. By varying the aspect ratio of the beam and, thus, the ratio of compressive to bending effects, we modify the ratio of overall bending to compressive energies which becomes critical near threshold Nous etudions numeriquement la degradation des proprietes mecaniques d'un reseau carre de barres (obtenu par perforations periodiques d'une plaque) avec des angles de liaison constants entre barres en fonction du nombre d'elements supprimes au hasard (probleme de percolation de liens). En vue de limiter les fluctuations dues a la petite taille des reseaux, on a evalue simultanement le module elastique et la conductance electrique en fonction du taux de degradation. Les resultats pour des faibles et pour des forts taux sont consistants respectivement avec les modeles de champ moyen et de percolation mecanique. En variant l'allongement des barres et, par suite, le rapport entre les effets de compression et de flexion, on modifie le rapport des energies associees a ces deux mecanismes, rapport qui devient critique au seuil de percolation
我们数值研究了具有刚性键角的二维方晶格梁的力学性能随随机移除单元的函数的退化(键渗透问题)。为了限制由于样本尺寸小而引起的波动，在相同的晶格上绘制了弹性模量与电导率的关系。弱和强退化晶格的结果与EMA和机械渗流结果一致。通过改变梁的长径比，从而改变压缩与弯曲效应的比值，我们修改了总弯曲与压缩能量的比值，该比值在接近阈值时变得至关重要。Nous equement numerentiement(数值模拟)、dedeproprietes mecques d’un reseau carre de barres (obtenu par穿孔周期d’une plaque)、dede角、dedeliaison constant (dedebarres)、dedenombre d’elements (depercolation de liens)的函数。在一个值上，限位器可以减少波动，在一个值上，同时可以减少模块的弹性和电导的功能，从而减少退化。结果表明，渗流模型和渗流机理模型之间存在一定的一致性。在变化的l'allongement des barres et, par suite, le rapent entres les效应，在变化的le rapent des energies associes和des deux mechanism, rapent quan devient critique au seuil de per渗流
{"title":"Mechanical percolation : a small beam lattice study","authors":"S. Roux, E. Guyon","doi":"10.1051/JPHYSLET:019850046021099900","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046021099900","url":null,"abstract":"We numerically study the degradation of the mechanical properties of a two dimensional square lattice of beams with rigid bond angles as a function of the elements removed at random (bond percolation problem). In order to limit the fluctuations due to the small sample sizes, the elastic modulus is plotted versus the electrical conductance on the same lattices. The results for weakly and strongly degraded lattices are consistent with EMA and mechanical percolation results. By varying the aspect ratio of the beam and, thus, the ratio of compressive to bending effects, we modify the ratio of overall bending to compressive energies which becomes critical near threshold Nous etudions numeriquement la degradation des proprietes mecaniques d'un reseau carre de barres (obtenu par perforations periodiques d'une plaque) avec des angles de liaison constants entre barres en fonction du nombre d'elements supprimes au hasard (probleme de percolation de liens). En vue de limiter les fluctuations dues a la petite taille des reseaux, on a evalue simultanement le module elastique et la conductance electrique en fonction du taux de degradation. Les resultats pour des faibles et pour des forts taux sont consistants respectivement avec les modeles de champ moyen et de percolation mecanique. En variant l'allongement des barres et, par suite, le rapport entre les effets de compression et de flexion, on modifie le rapport des energies associees a ces deux mecanismes, rapport qui devient critique au seuil de percolation","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"5 1","pages":"999-1004"},"PeriodicalIF":0.0,"publicationDate":"1985-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73887444","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}
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