Pub Date : 1985-10-01DOI: 10.1051/JPHYSLET:019850046019091500
M. Leleyter
A comparison is made between linear interstellar molecules HC x N observed only for odd x and C n H − ions obtained in SIMS experiments which are very much profuse for even n than for odd ones. These two kinds of clusters are isoelectronic if n=x+1. So the study of the C n H − ion properties with the Huckel method lets to get easily some results on HC x N molecules and to understand why only the odd ones are detected in interstellar clouds: the Fermi level of these clusters indeed falls into a band of degenerated π levels; so according to the carbon atom number parity, it is either full up to even n or odd x (great stability of the cluster) or half-filled in the other case (weaker stability of the corresponding cluster). C n H + ions and C n H molecules are considered too Comparaison des molecules interstellaires HC x N lineaires, observees seulement pour x impair, et les ions C n H − , obtenus par experiences SIMS et beaucoup plus abondants pour n pair que n impair. Calculs de Huckel pour les systemes isoelectroniques, lorsque n=x+1, sur C n H − et aussi sur HC x N, observe dans les nuages interstellaires avec x impair
对线性星际分子HC x N与SIMS实验中得到的HC N H离子进行了比较，其中偶数N比奇数N丰富得多。当n=x+1时，这两种簇是等电子的。因此，用Huckel方法研究C n H离子的性质，可以很容易地得到HC x n分子的一些结果，并理解为什么在星际云中只检测到奇怪的分子:这些星团的费米能级确实落在简并π能级的带中;因此，根据碳原子数宇称，它要么满到偶数n或奇数x(簇的稳定性很好)，要么半满(相应簇的稳定性较弱)。chnh +离子和chnh分子被认为是太过分子间的比较，观测到的是HC x n线性，观测到的是chnh -离子的沉淀，观测到的是chnh -离子的沉淀，观测到的是SIMS et beoup +丰度的沉淀，观测到的是SIMS et beoup +丰度的沉淀。计算Huckel倒les系统isoelectroniques,当n = x + 1,苏尔C n H−等也在HC x n,观察在nuages interstellaires用x损害
{"title":"Sur une similitude entre des agrégats obtenus en émission ionique secondaire et des molécules observées en astrophysique","authors":"M. Leleyter","doi":"10.1051/JPHYSLET:019850046019091500","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046019091500","url":null,"abstract":"A comparison is made between linear interstellar molecules HC x N observed only for odd x and C n H − ions obtained in SIMS experiments which are very much profuse for even n than for odd ones. These two kinds of clusters are isoelectronic if n=x+1. So the study of the C n H − ion properties with the Huckel method lets to get easily some results on HC x N molecules and to understand why only the odd ones are detected in interstellar clouds: the Fermi level of these clusters indeed falls into a band of degenerated π levels; so according to the carbon atom number parity, it is either full up to even n or odd x (great stability of the cluster) or half-filled in the other case (weaker stability of the corresponding cluster). C n H + ions and C n H molecules are considered too Comparaison des molecules interstellaires HC x N lineaires, observees seulement pour x impair, et les ions C n H − , obtenus par experiences SIMS et beaucoup plus abondants pour n pair que n impair. Calculs de Huckel pour les systemes isoelectroniques, lorsque n=x+1, sur C n H − et aussi sur HC x N, observe dans les nuages interstellaires avec x impair","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"10 1","pages":"915-922"},"PeriodicalIF":0.0,"publicationDate":"1985-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90636483","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 : 1985-10-01DOI: 10.1051/JPHYSLET:019850046019093500
V. Rusakov, M. Shliomis
Evaluation des coefficients de developpement de l'energie libre dans le cadre d'un modele moleculaire statistique
在统计分子模型框架内评价自由能发展系数
{"title":"Landau-de Gennes free energy expansion for nematic polymers","authors":"V. Rusakov, M. Shliomis","doi":"10.1051/JPHYSLET:019850046019093500","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046019093500","url":null,"abstract":"Evaluation des coefficients de developpement de l'energie libre dans le cadre d'un modele moleculaire statistique","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"17 1","pages":"935-943"},"PeriodicalIF":0.0,"publicationDate":"1985-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75880091","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 : 1985-09-01DOI: 10.1051/JPHYSLET:019850046017077100
M. Mézard, G. Parisi
We use the replica method to study the (bipartite) weighted matching problem with independent random distances between the points. We propose a replica symmetric solution which fits the numerical values of the minimal length and the distribution of lengths of the occupied links in the optimal configuration Nous utilisons la methode des repliques pour etudier le probleme du matching (bipartite) avec des distances aleatoires independantes entre les points. Nous proposons une solution, symetrique dans les repliques, qui est en accord avec les valeurs numeriques de la longueur minimale et la distribution des longueurs des liens occupes dans la configuration optimale.
{"title":"Replicas and optimization","authors":"M. Mézard, G. Parisi","doi":"10.1051/JPHYSLET:019850046017077100","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046017077100","url":null,"abstract":"We use the replica method to study the (bipartite) weighted matching problem with independent random distances between the points. We propose a replica symmetric solution which fits the numerical values of the minimal length and the distribution of lengths of the occupied links in the optimal configuration Nous utilisons la methode des repliques pour etudier le probleme du matching (bipartite) avec des distances aleatoires independantes entre les points. Nous proposons une solution, symetrique dans les repliques, qui est en accord avec les valeurs numeriques de la longueur minimale et la distribution des longueurs des liens occupes dans la configuration optimale.","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"16 1","pages":"771-778"},"PeriodicalIF":0.0,"publicationDate":"1985-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84408959","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 : 1985-09-01DOI: 10.1051/JPHYSLET:019850046018086900
M. Druetta, M. Mayo, S. Bliman, Serge Martin, D. Hitz, S. Dousson, J. Désesquelles
The charge exchange collision between Ne 8+ and He has been studied by VUV spectroscopy. Emission cross sections of the observed transition have been measured. Absolute excitation cross sections and the total single electron capture cross section have been deduced Etude spectroscopique (160-900 A) pour des collisions a 48, 64 et 80 keV. Mesure des sections efficaces d'emission. Deduction des valeurs absolues des sections efficaces d'excitation des niveaux n=4 de Ne VIII et de la section efficace totale d'echange de charge
{"title":"Etude spectroscopique de la collision d'échange de charge entre Ne 8+ et He","authors":"M. Druetta, M. Mayo, S. Bliman, Serge Martin, D. Hitz, S. Dousson, J. Désesquelles","doi":"10.1051/JPHYSLET:019850046018086900","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046018086900","url":null,"abstract":"The charge exchange collision between Ne 8+ and He has been studied by VUV spectroscopy. Emission cross sections of the observed transition have been measured. Absolute excitation cross sections and the total single electron capture cross section have been deduced Etude spectroscopique (160-900 A) pour des collisions a 48, 64 et 80 keV. Mesure des sections efficaces d'emission. Deduction des valeurs absolues des sections efficaces d'excitation des niveaux n=4 de Ne VIII et de la section efficace totale d'echange de charge","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"29 1","pages":"869-873"},"PeriodicalIF":0.0,"publicationDate":"1985-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73279692","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 : 1985-09-01DOI: 10.1051/JPHYSLET:019850046017082500
G. Sigaud, M. Achard, F. Hardouin
On the basis of microscopic observations on free droplets we have located different transition lines between 2D fluid smectic phases in (x, T) binary diagrams. In particular a textural criterion has been defined to identify for the first time the S C -S A phase transition. Our studies lead to the classification of three 2D fluid smectics according to the following sequence: S C -S A -S Ad c d r d e with decreasing temperature Localisation de differentes lignes de transition entre phases smectiques fluides bidimensionnelles dans des diagrammes binaires concentration-temperature. Definition d'un critere de changement de texture pour identifier la transition S c -S A
在对自由液滴微观观察的基础上，我们确定了(x, T)二元图中二维流体近晶相之间的不同过渡线。特别地，我们首次定义了一个织构判据来识别S - C -S - a相变。我们的研究将三种二维流体指标按以下顺序分类:S - C -S - A -S - C - d - d - d - e随温度的降低，不同过渡中心相的定位，流体的二维结构，二元结构，浓度-温度。定义d'un准则的变化，纹理和标识符的转换S c -S
{"title":"Generalization of the polymorphism with 2D fluid smectic phases","authors":"G. Sigaud, M. Achard, F. Hardouin","doi":"10.1051/JPHYSLET:019850046017082500","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046017082500","url":null,"abstract":"On the basis of microscopic observations on free droplets we have located different transition lines between 2D fluid smectic phases in (x, T) binary diagrams. In particular a textural criterion has been defined to identify for the first time the S C -S A phase transition. Our studies lead to the classification of three 2D fluid smectics according to the following sequence: S C -S A -S Ad c d r d e with decreasing temperature Localisation de differentes lignes de transition entre phases smectiques fluides bidimensionnelles dans des diagrammes binaires concentration-temperature. Definition d'un critere de changement de texture pour identifier la transition S c -S A","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"11 1","pages":"825-830"},"PeriodicalIF":0.0,"publicationDate":"1985-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83526348","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 : 1985-09-01DOI: 10.1051/JPHYSLET:019850046018088700
S. Ng, T. Hosea, L. Gan
The Brillouin shift and width for poly(vinyl alcohol) hydrogels of two different crosslink densities have been obtained as a function of gel network volume fraction using a five-pass Fabry-Perot interferometer. The results are discussed in the light of a theory for Brillouin lightscattering from gels proposed recently by J. A. Marqusee and J. M. Deutch.
{"title":"BRILLOUIN LIGHT-SCATTERING FROM POLY(VINYL ALCOHOL) HYDROGELS.","authors":"S. Ng, T. Hosea, L. Gan","doi":"10.1051/JPHYSLET:019850046018088700","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046018088700","url":null,"abstract":"The Brillouin shift and width for poly(vinyl alcohol) hydrogels of two different crosslink densities have been obtained as a function of gel network volume fraction using a five-pass Fabry-Perot interferometer. The results are discussed in the light of a theory for Brillouin lightscattering from gels proposed recently by J. A. Marqusee and J. M. Deutch.","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"93 1","pages":"887-892"},"PeriodicalIF":0.0,"publicationDate":"1985-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83212812","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 : 1985-09-01DOI: 10.1051/JPHYSLET:019850046018085100
U. Costa, A. Mariz, C. Tsallis
We use a Migdal-Kadanoff-like renormalization group approach to study the critical behaviour of a semi-infinite simple cubic Ising ferromagnet whose (1, 0, 0) free surface contains anisotropic (in spin space) Heisenberg ferromagnetic interactions. The phase diagram presents three phases (namely the paramagnetic, the bulk ferromagnetic and the surface ferromagnetic ones) which join on a multicritical point The location of this point is calculated as a function of the anisotropy. The various universality classes of the problem are exhibited.
{"title":"Anisotropic Heisenberg surface on semi-infinite Ising ferromagnet : renormalization group treatment","authors":"U. Costa, A. Mariz, C. Tsallis","doi":"10.1051/JPHYSLET:019850046018085100","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046018085100","url":null,"abstract":"We use a Migdal-Kadanoff-like renormalization group approach to study the critical behaviour of a semi-infinite simple cubic Ising ferromagnet whose (1, 0, 0) free surface contains anisotropic (in spin space) Heisenberg ferromagnetic interactions. The phase diagram presents three phases (namely the paramagnetic, the bulk ferromagnetic and the surface ferromagnetic ones) which join on a multicritical point The location of this point is calculated as a function of the anisotropy. The various universality classes of the problem are exhibited.","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"16 1","pages":"851-859"},"PeriodicalIF":0.0,"publicationDate":"1985-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75295342","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 : 1985-09-01DOI: 10.1051/JPHYSLET:019850046018087500
J. Malthěte, A. Levelut, N. H. Tinh
Two hexa-alkoxy derivatives (7a and 7b) of terephthal-bis-[4-benzoyloxyaniline] are described. They exhibit two new types of mesophase for which the term phasmidic is proposed: one has an hexagonal 2D lattice and the second an oblique 2D lattice Description de deux derives hexaalcoxy de la terephtal-bis-[benzoyloxy-4-aniline], presentent deux nouveaux types de mesophase. L'une de ces phases possede un reseau bidimensionnel hexagonal, l'autre un reseau bidimensionnel oblique
描述了对苯二酚-双[4-苯甲酰氧基苯胺]的两个六烷氧基衍生物(7a和7b)。它们表现出两种新的中间相类型，其中一种具有六角形二维晶格，另一种具有斜二维晶格，这是两种新的中间相类型。描述二代衍生出六氧基对苯二酚-双-[苯甲氧基-4-苯胺]。L'une de des相具有无研究的二维六边形，无研究的二维斜向
{"title":"Phasmids : a new class of liquid crystals","authors":"J. Malthěte, A. Levelut, N. H. Tinh","doi":"10.1051/JPHYSLET:019850046018087500","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046018087500","url":null,"abstract":"Two hexa-alkoxy derivatives (7a and 7b) of terephthal-bis-[4-benzoyloxyaniline] are described. They exhibit two new types of mesophase for which the term phasmidic is proposed: one has an hexagonal 2D lattice and the second an oblique 2D lattice Description de deux derives hexaalcoxy de la terephtal-bis-[benzoyloxy-4-aniline], presentent deux nouveaux types de mesophase. L'une de ces phases possede un reseau bidimensionnel hexagonal, l'autre un reseau bidimensionnel oblique","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"303 1","pages":"875-880"},"PeriodicalIF":0.0,"publicationDate":"1985-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73605268","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 : 1985-09-01DOI: 10.1051/JPHYSLET:019850046017079300
S. Zaleski, P. Lallemand
We investigate numerically the statistical properties of the Kuramoto-Sivashinsky-Tsuzuki model [1-3], which describes the phase fluctuations of extended systems near the transition to turbulence. This model has some similarities with hydrodynamic turbulence [4]. The time fluctuations exhibit an unexpected scaling corresponding to anomalous diffusion of the phase. Other results also point to an intermittent behaviour Etude numerique des proprietes statistiques de l'equation de Kuramoto-Sivashinsky-Tsuzuki decrivant des systemes etendus pres du point de transition vers la turbulence a travers leurs fluctuations de phase
{"title":"Scaling laws and intermittency in phase turbulence","authors":"S. Zaleski, P. Lallemand","doi":"10.1051/JPHYSLET:019850046017079300","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046017079300","url":null,"abstract":"We investigate numerically the statistical properties of the Kuramoto-Sivashinsky-Tsuzuki model [1-3], which describes the phase fluctuations of extended systems near the transition to turbulence. This model has some similarities with hydrodynamic turbulence [4]. The time fluctuations exhibit an unexpected scaling corresponding to anomalous diffusion of the phase. Other results also point to an intermittent behaviour Etude numerique des proprietes statistiques de l'equation de Kuramoto-Sivashinsky-Tsuzuki decrivant des systemes etendus pres du point de transition vers la turbulence a travers leurs fluctuations de phase","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"228 1","pages":"793-796"},"PeriodicalIF":0.0,"publicationDate":"1985-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75764200","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 : 1985-09-01DOI: 10.1051/JPHYSLET:019850046017083700
M. Cates
A dense system of mutually avoiding polymers, obeying a quenched power-law mass distribution, n(m) ∼ m-τ (with low and high cutoffs) is considered in d dimensions. It is argued that, for a certain range of τ (d/dfg < τ - 1 < d/dfs), the chains are neither Gaussian (fractal dimension df = dfg) nor fully swollen (d f = dfs), but instead obey exactly a hyperscaling relation, df = d/(τ - 1). This result applies both to linear polymers (dfg = 2, d fs = 1/ν(d)) and to « polymeric fractals » (e.g., sol-molecules) of general connectivity. Scaling laws for dilution are also given.
{"title":"Excluded volume and hyperscaling in polymeric systems","authors":"M. Cates","doi":"10.1051/JPHYSLET:019850046017083700","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046017083700","url":null,"abstract":"A dense system of mutually avoiding polymers, obeying a quenched power-law mass distribution, n(m) ∼ m-τ (with low and high cutoffs) is considered in d dimensions. It is argued that, for a certain range of τ (d/dfg < τ - 1 < d/dfs), the chains are neither Gaussian (fractal dimension df = dfg) nor fully swollen (d f = dfs), but instead obey exactly a hyperscaling relation, df = d/(τ - 1). This result applies both to linear polymers (dfg = 2, d fs = 1/ν(d)) and to « polymeric fractals » (e.g., sol-molecules) of general connectivity. Scaling laws for dilution are also given.","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"240 1","pages":"837-843"},"PeriodicalIF":0.0,"publicationDate":"1985-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73173338","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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