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Simulation of small particle penetration in a random medium 随机介质中小颗粒穿透的模拟
Journal De Physique Pub Date : 1990-12-01 DOI: 10.1051/JPHYS:0199000510230267300
P. Meakin, R. Jullien
{"title":"Simulation of small particle penetration in a random medium","authors":"P. Meakin, R. Jullien","doi":"10.1051/JPHYS:0199000510230267300","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510230267300","url":null,"abstract":"Random packings of identical spheres of unit diameter were built according to a procedure in which spheres are released one after another along randomly positionned vertical trajectories and then follow the path of steepest descent on the others until they reach a stable position under gravity. Once a packing has been built, smaller spheres, of diameter d does not diverge but saturates to c 11 and the histogram N reaches an exponential shape whose large ΔZ tail is well fitted by N α exp(−0.103 ΔZ). It is shown that such behavior is due to a non zero proportion of equilateral triangles of tangent spheres in the random packing","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"54 1","pages":"2673-2680"},"PeriodicalIF":0.0,"publicationDate":"1990-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84494335","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: 13
Fluctuations in the flat and collapsed phases of polymerized membranes 聚合膜的平相和塌相的波动
Journal De Physique Pub Date : 1990-12-01 DOI: 10.1051/JPHYS:0199000510230265300
F. F. Abraham, D. Nelson
{"title":"Fluctuations in the flat and collapsed phases of polymerized membranes","authors":"F. F. Abraham, D. Nelson","doi":"10.1051/JPHYS:0199000510230265300","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510230265300","url":null,"abstract":"Fluctuations in polymerized membranes are explored via extensive molecular dynamics simulations of simplified «tethered surface» models. The entropic rigidity associated with repulsive second-nearest-neighbor interactions leads to a flattening of «phantom surfaces». An attractive interaction in the presence of distant self-avoidance leads to a collapsed membrane with fractal dimension three at sufficiently low temperatures. When the attractive interaction is turned off, the surface returns to the flat phase found in earlier simulations. A study of density profiles and hexatic internal order allows a simple physical interpretation of results for the structure function of oriented membranes","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"1947 1","pages":"2653-2672"},"PeriodicalIF":0.0,"publicationDate":"1990-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91205168","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: 61
Interactions in mixtures of colloid and polymer 胶体和聚合物混合物中的相互作用
Journal De Physique Pub Date : 1990-12-01 DOI: 10.1051/JPHYS:0199000510240281300
P. Tong, T. Witten, J. Huang, L. Fetters
{"title":"Interactions in mixtures of colloid and polymer","authors":"P. Tong, T. Witten, J. Huang, L. Fetters","doi":"10.1051/JPHYS:0199000510240281300","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510240281300","url":null,"abstract":"Etude par diffusion optique aux petits angles de l'interaction entre un colloide stabilise par un agent de surface et le polyisoprene hydrogene. A l'aide d'un developpement du viriel, l'intensite de diffusion est calculee en fonction des concentrations en polymere et en colloide; la formule obtenue permet de mesurer le volume exclu mutuel entre le polymere et le colloide; le deuxieme coefficient du viriel des particules colloidales dans la solution diluee de polymere est aussi deduit. Cette methode d'obtention des parametres d'interaction dans un melange polymere-colloide est capable de sonder les changements du potentiel d'interaction de la suspension colloidale dus a l'addition du polymere (effet de depletion)","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"10 1","pages":"2813-2827"},"PeriodicalIF":0.0,"publicationDate":"1990-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85416834","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
A comment upon the use of two criteria in the identification of intrinsic esr in high Tc oxides 对鉴定高Tc氧化物中本征esr的两个判据的评述
Journal De Physique Pub Date : 1990-12-01 DOI: 10.1051/JPHYS:0199000510240273900
A. Deville, B. Gaillard
{"title":"A comment upon the use of two criteria in the identification of intrinsic esr in high Tc oxides","authors":"A. Deville, B. Gaillard","doi":"10.1051/JPHYS:0199000510240273900","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510240273900","url":null,"abstract":"An ESR signal detected in a Bi compound has recently been attributed to the SC phase, arguing that two criteria (value and thermal behaviour of the intensity) were met. We draw attention to the weakness of this argument, recalling a canonical example Un signal RPE observe dans un compose au bismuth a ete recemment attribue a la phase SC, en s'appuyant sur le fait que deux criteres (valeur et comportement thermique de l'intensite) sont verifies. Nous attirons l'attention sur la faiblesse de cette argumentation, et rappelons un exemple canonique","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"33 1","pages":"2739-2741"},"PeriodicalIF":0.0,"publicationDate":"1990-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76196748","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
Direct reconstruction of pp elastic scattering amplitudes from experimental data between 0.83 and 2.7 GeV 从0.83 ~ 2.7 GeV的实验数据直接重建pp弹性散射振幅
Journal De Physique Pub Date : 1990-12-01 DOI: 10.1051/JPHYS:0199000510230268900
C. Lac, J. Ball, J. Bystrický, J. Derégel, F. Lehár, A. Lesquen, L. Rossum, J. Fontaine, F. Perrot, P. Winternitz
{"title":"Direct reconstruction of pp elastic scattering amplitudes from experimental data between 0.83 and 2.7 GeV","authors":"C. Lac, J. Ball, J. Bystrický, J. Derégel, F. Lehár, A. Lesquen, L. Rossum, J. Fontaine, F. Perrot, P. Winternitz","doi":"10.1051/JPHYS:0199000510230268900","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510230268900","url":null,"abstract":"The direct reconstruction of the elastic scattering amplitudes at eleven energies between 0.83 and 2.7 GeV is described. Complete sets of spin dependent observables used for this reconstruction were measured in the nucleon-nucleon experimental program at Saturne II. The invariant amplitudes a, b, c, d and e were deduced using the least square method fit to the experimental data. A search for solutions starting from random initial values was performed to determine different possible sets of amplitudes. The absolute values show a similar angular dependence at all energies and for all solutions. The dependence of phases show discrete ambiguities especially at the higher energies. One of the solutions at 2.1 GeV suggests a behaviour which could be related to a dibaryon resonance of mass 2.73 GeV with the half-width at the half-maximum less than 50 MeV.","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"175 4","pages":"2689-2716"},"PeriodicalIF":0.0,"publicationDate":"1990-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72569838","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
Experimental evidence for deterministic chaos in electrochemical deposition 电化学沉积中确定性混沌的实验证据
Journal De Physique Pub Date : 1990-11-01 DOI: 10.1051/JPHYS:0199000510210247700
F. Argoul, A. Arneodo
{"title":"Experimental evidence for deterministic chaos in electrochemical deposition","authors":"F. Argoul, A. Arneodo","doi":"10.1051/JPHYS:0199000510210247700","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510210247700","url":null,"abstract":"We report an experimental study of the statics and dynamics of electrodeposition of zinc in an aqueous medium, in the intermediate regime between dendritic and DLA-like metallic clusters. During the growth process, periodic and nonperiodic oscillations of the voltage are recorded under constant applied current intensity. Period-doubling bifurcations are identified. Analysis of the data in terms of phase portraits, Poincare maps and 1-D maps shows that the fractal geometry of these electrochemical deposits is the signature of a low-dimensional deterministic chaotic dynamics which displays sensitivity to initial conditions. The study of the apparently more complex dynamics recorded in the DLA limit is a very promising experimental challenge Nous presentons ici les resultats d'une etude experimentale du processus d'electrodeposition de zinc en milieu aqueux bidimensionnel. Les regimes etudies sont intermediaires entre des croissances metalliques de nature dendritique et des croissances plus desordonnees similaires aux agregats fractals engendres par simulation numerique de modele d'agregation limitee par la diffusion de Witten et Sander (DLA model). L'etude de ces dynamiques complexes apporte une premiere evidence experimentale du caractere chaotique deterministe de ces phenomenes de structuration d'interface et la signature d'une dynamique a faible nombre de degres de liberte. L'etude dynamique de regimes encore plus complexes observes dans la limite DLA s'avere etre un challenge experimental des plus prometteurs","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"1 1","pages":"2477-2487"},"PeriodicalIF":0.0,"publicationDate":"1990-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88887030","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: 16
Rheological Rouse model for a polymer in a nematic matrix 向列矩阵中聚合物的流变劳斯模型
Journal De Physique Pub Date : 1990-11-01 DOI: 10.1051/JPHYS:0199000510220259500
F. Lequeux, R. Hocquart
{"title":"Rheological Rouse model for a polymer in a nematic matrix","authors":"F. Lequeux, R. Hocquart","doi":"10.1051/JPHYS:0199000510220259500","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510220259500","url":null,"abstract":"A model of coupling between a mouse drain and a nematic order parameter is developed. The geometry of the chain for each mode, in simple shear flow is calculated. The local torque and normal stress sign are discussed. This implies non trivial ways to introduce the opposite coupling (from chain to parameter order) in order to get a model for mouse nematic polymers","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"83 1","pages":"2595-2604"},"PeriodicalIF":0.0,"publicationDate":"1990-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80691177","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
Temperature dependent locally resolved 13C knight shifts in the organic conductor TTF[Ni(dmit)2]2 有机导体TTF[Ni(dmit)2]中温度依赖局部解析的13C骑士位移2
Journal De Physique Pub Date : 1990-11-01 DOI: 10.1051/JPHYS:0199000510210246500
A. Vainrub, E. Canadell, D. Jérome, P. Bernier, T. Nunes, M. Bruniquel, P. Cassoux
{"title":"Temperature dependent locally resolved 13C knight shifts in the organic conductor TTF[Ni(dmit)2]2","authors":"A. Vainrub, E. Canadell, D. Jérome, P. Bernier, T. Nunes, M. Bruniquel, P. Cassoux","doi":"10.1051/JPHYS:0199000510210246500","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510210246500","url":null,"abstract":"High resolution 13 C NMR results for the organic conductor TTF[Ni(dmit) 2 ] 2 enriched by 13 C isotope in Ni(dmit) 2 molecules are reported. Variable temperature magic angle spinning experiments were performed between 160 and 295 K. Paramagnetic Knight shifts in the range 41-106.5 ppm at room temperature are observed for all Ni(dmit) 2 carbon sites. These shifts are slightly temperature dependent for inner carbons. However, for outer carbons, the shifts strongly decrease towards low temperature due to precursor effects of the charge density wave (CDW) transition. The results confirm the occurrence of both HOMO (highest occupied molecular orbital) and LUMO (lowest unoccupied molecular orbital) conduction bands and are compared with calculated partial contributions of individual carbon atoms to the density of states at the Fermi level. We suggest that CDW effects above 160 K are associated with the LUMO bands","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"16 1","pages":"2465-2476"},"PeriodicalIF":0.0,"publicationDate":"1990-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81567099","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
Grain boundary premelting in crystalline benzene as studied by proton N.M.R. 质子核磁共振研究结晶苯的晶界预熔
Journal De Physique Pub Date : 1990-11-01 DOI: 10.1051/JPHYS:0199000510210248900
C. Craven, G. Dosseh, B. Rousseau, A. Fuchs
{"title":"Grain boundary premelting in crystalline benzene as studied by proton N.M.R.","authors":"C. Craven, G. Dosseh, B. Rousseau, A. Fuchs","doi":"10.1051/JPHYS:0199000510210248900","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510210248900","url":null,"abstract":"The phenomenon of premelting has been investigated by proton n.m.r. in polycrystalline benzene of various purity. Our results suggest that premelting initiates at grain boundaries. The exact nature of the molten domains near the standard melting point is not yet clear but is presumably analogous to what is obtained in the surface melting experiments, i.e. a «strongly correlated interface liquid» Le phenomene de prefusion dans le benzene polycristallin de purete variable a ete etudie par r.m.n. du proton. Nos resultats suggerent que la prefusion debute aux joints de grains. La nature exacte des domaines fondus n'est pas encore tres claire mais il semble que l'on observe un liquide d'interface tres correle, comme les auteurs qui etudient la fusion de surface","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"26 1","pages":"2489-2499"},"PeriodicalIF":0.0,"publicationDate":"1990-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82849060","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: 9
Performance enhancement of Willshaw type networks through the use of limit cycles 利用极限环提高Willshaw型网络的性能
Journal De Physique Pub Date : 1990-11-01 DOI: 10.1051/JPHYS:0199000510210238700
G. Kohring
{"title":"Performance enhancement of Willshaw type networks through the use of limit cycles","authors":"G. Kohring","doi":"10.1051/JPHYS:0199000510210238700","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510210238700","url":null,"abstract":"Simulation results of a Willshaw type model for storing sparsely coded patterns are presented. It is suggested that random patterns can be stored in Willshaw type models by transforming them into a set of sparsely coded patterns and retrieving this set as a limit cycle. In this way, the number of steps needed to recall a pattern will be a function of the amount of information the pattern contains. A general algorithm for simulating neural networks with sparsely coded patterns is also discussed, and, on a fully connected network of N=36864 neurons (1.4×10 9 couplings), it is shown to achieve effective updaping speeds as high as 1.6×10 11 coupling evaluations per second on one Cray-YMP processor","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"21 1","pages":"2387-2393"},"PeriodicalIF":0.0,"publicationDate":"1990-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87030053","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
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