Lattice gas with ``interaction potential''

We present an extension of a simple automaton model to incorporate non-local interactions extending over a spatial range in lattice gases. {}From the viewpoint of Statistical Mechanics, the lattice gas with interaction range may serve as a prototype for non-ideal gas behavior. {}From the density fluctuations correlation function, we obtain a quantity which is identified as a potential of mean force. Equilibrium and transport properties are computed theoretically and by numerical simulations to establish the validity of the model at macroscopic scale.Comment: 12 pages LaTeX, figures available on demand ([email protected]

Entropy and Correlations in Lattice Gas Automata without Detailed Balance

We consider lattice gas automata where the lack of semi-detailed balance results from node occupation redistribution ruled by distant configurations; such models with nonlocal interactions are interesting because they exhibit non-ideal gas properties and can undergo phase transitions. For this class of automata, mean-field theory provides a correct evaluation of properties such as compressibility and viscosity (away from the phase transition), despite the fact that no H-theorem strictly holds. We introduce the notion of locality - necessary to define quantities accessible to measurements - by treating the coupling between nonlocal bits as a perturbation. Then if we define operationally ``local'' states of the automaton - whether the system is in a homogeneous or in an inhomogeneous state - we can compute an estimator of the entropy and measure the local channel occupation correlations. These considerations are applied to a simple model with nonlocal interactions.Comment: 13 pages, LaTeX, 5 PostScript figures, uses psfig. Submitted to Int. J. Mod. Phys.

Computer Simulation Study of the Levy Flight Process

Random walk simulation of the Levy flight shows a linear relation between the mean square displacement and time. We have analyzed different aspects of this linearity. It is shown that the restriction of jump length to a maximum value (lm) affects the diffusion coefficient, even though it remains constant for lm greater than 1464. So, this factor has no effect on the linearity. In addition, it is shown that the number of samples does not affect the results. We have demonstrated that the relation between the mean square displacement and time remains linear in a continuous space, while continuous variables just reduce the diffusion coefficient. The results are also implied that the movement of a levy flight particle is similar to the case the particle moves in each time step with an average length of jumping . Finally, it is shown that the non-linear relation of the Levy flight will be satisfied if we use time average instead of ensemble average. The difference between time average and ensemble average results points that the Levy distribution may be a non-ergodic distribution.Comment: 14 pages, 7 figure

Indélicatesse et manque de rigueur dans les sondages

Indelicate Behavior and Lack of Rigor in Polling, Investigation Among Polling Professionals: Following statistical controls concerning the French EDF electricity board’s « Énergie et nucléaire » opinion poll survey (see references 1, 2 and 3), EDF decided to complete the study with an investigation among polling professionals to clarify observed data anomalies and to begin to understand how to remedy these anomalies. The authors were guided by these anomalies in conducting their interviews with survey interviewers. The dark picture which emerges from this study may be more somber than the real situation since polling professionals were encouraged to identify insufficiencies in the polling process they had witnessed during their work (with different institutions), particularly over the past few years. Certain of these insufficiencies reflect an increasing lack of rigor on the part of polling firm clients and the polling firms themselves.Suite aux contrôles statistiques qui avaient été effectués sur les données d’opinion du baromètre « Énergie et nucléaire » mis en place par EDF (voir références 1,2, et 3), il a été décidé par EDF de compléter l’étude par une première enquête auprès des professionnels du sondage pour préciser les causes des anomalies constatées et commencer à réfléchir à la manière d’y remédier. Ce sont donc les anomalies observées suite à ces contrôles statistiques qui ont inspiré les trois responsables de l’étude dans leur manière de conduire les entretiens. Aussi le tableau qui est dressé dans cet article peut-il être plus sombre que la réalité, les enquêteurs chevronnés interrogés étant incités à pointer avant tout les insuffisances qu’ils avaient constatées dans leur métier en général (tous instituts confondus), particulièrement depuis ces dernières années, certaines reflétant un grand laisser aller du côté des commanditaires et des professionnels en amont

Mécanique statistique des automates de gaz sur réseau à interactions non-locales

Doctorat en Sciencesinfo:eu-repo/semantics/nonPublishe

Di un patriota e storiografo triestino: Antonio Tribel

Università degli Studi di Triest

Prose musicali

Liceo scientifico Guglielmo Oberdan Triest

Noise cancellation for Music Recordings Recovery: From a Machine Learning perspective

Ce mémoire de Master se concentre sur les différentes approches existantes en Machine Learning, plus spécifiquement en réseaux neuronaux, pour diminuer la quantité de bruit présent dans des enregistrements musicaux.info:eu-repo/semantics/nonPublishe