Interference of an array of independent Bose-Einstein condensates

We have observed high-contrast matter wave interference between 30 Bose-Einstein condensates with uncorrelated phases. Interference patterns were observed after independent condensates were released from a one-dimensional optical lattice and allowed to expand and overlap. This initially surprising phenomenon is explained with a simple theoretical model which generalizes the analysis of the interference of two independent condensates

Reflections on cuban dissidence

Since the raids of Spring 2003, international press has put dissidents in the forefront of news about Cuba. From the outside, one might believe that the dissidents have a strong gri p on “civil society” and that they represent the democratic future. However, the radical brutality that broke out over these opponents, who the regime describes as “mercenaries at the Empire’s service,” is not the only dimension hindering their movement. We cannot understand the manner in which they have been ignored and engulfed without reconstructing the context of a society immersed within the opaque universe of the “lucha”, the weight of a social imaginary obsessed by “intrigue,” and the effect of official propaganda. The political paradigms in which they are inscribed also share with the Castrist matrix a culture rooted in long-term national history, which exalts the virtues of homogeneity, unanimity and enlightened elitism.Translation Alberto Valencia Gutiérrez, Professor Universidad del Valle in Cali Colombia.Desde la represión de la primavera del 2003, la prensa internacional convirtió a los disidentes en el tema central de la actualidad cubana. Desde el exterior, pareciera que la influencia de éstos en la “sociedad civil” es real y que representan el futuro democrático. Sin embargo, la radical brutalidad que cayó sobre estos opositores, calificados por el régimen como “mercenarios al servicio del imperio”, no constituye el único obstáculo a su movimiento. La manera como fueron ignorados y fagocitados sólo se puede entender describiendo el contexto de una sociedad sumergida en el universo opaco de la lucha, el peso de un imaginario social obsesionado por la “intriga” y el trabajo de la propaganda oficial. Incluso los registros políticos en los cuales se inscriben comparten con la matriz castrista una cultura arraigada en la historia nacional que celebra las virtudes de la homogeneidad, de la unanimidad y del elitismo ilustrado.Traducción Alberto Valencia Gutiérrez, Profesor Universidad del Valle de Cali Colombia

O castrismo de mercado: uma leitura lefortiana

The article intends to make an analysis of market castrism, which introduced an actualization to the cuban socialist model, through Lefort’s perspective of comprehension of the political.O artigo pretende fazer uma análise do castrismo de mercado, o qual introduziu uma atualização do modelo socialista em Cuba, por meio da perspectiva lefortiana de compreensão do político

Vehicle Communication using Secrecy Capacity

We address secure vehicle communication using secrecy capacity. In particular, we research the relationship between secrecy capacity and various types of parameters that determine secrecy capacity in the vehicular wireless network. For example, we examine the relationship between vehicle speed and secrecy capacity, the relationship between the response time and secrecy capacity of an autonomous vehicle, and the relationship between transmission power and secrecy capacity. In particular, the autonomous vehicle has set the system modeling on the assumption that the speed of the vehicle is related to the safety distance. We propose new vehicle communication to maintain a certain level of secrecy capacity according to various parameters. As a result, we can expect safer communication security of autonomous vehicles in 5G communications.Comment: 17 Pages, 12 Figure

P-matrix and J-matrix approaches. Coulomb asymptotics in the harmonic oscillator representation of scattering theory

The relation between the R- and P-matrix approaches and the harmonic oscillator representation of the quantum scattering theory (J-matrix method) is discussed. We construct a discrete analogue of the P-matrix that is shown to be equivalent to the usual P-matrix in the quasiclassical limit. A definition of the natural channel radius is introduced. As a result, it is shown to be possible to use well-developed technique of R- and P-matrix theory for calculation of resonant states characteristics, scattering phase shifts, etc., in the approaches based on harmonic oscillator expansions, e.g., in nuclear shell-model calculations. P-matrix is used also for formulation of the method of treating Coulomb asymptotics in the scattering theory in oscillator representation.Comment: Revtex, 57 pages including 15 figures; to be published in Annals of Physic

Questions aux praticiens de la scène

En conclusion de ce volume, cette dernière partie présente les réponses que certains auteurs et d’autres praticiens de la scène théâtrale ont apportées à trois questions portant sur leurs rapports au théâtre et sur ses liens avec le monde universitaire. Quelle importance a le théâtre ? Quels sont les défis du théâtre contemporain ? Y a-t-il une problématique qui devrait être traitée d’urgence par les études théâtrales universitaires 

HOPE, an open platform for medical data management on the grid

International audienc

PDB_REDO: automated re-refinement of X-ray structure models in the PDB

The majority of previously deposited X-ray structures can be improved by applying current refinement methods

Secrecy capacity of a class of orthogonal relay eavesdropper channels

The secrecy capacity of relay channels with orthogonal components is studied in the presence of an additional passive eavesdropper node. The relay and destination receive signals from the source on two orthogonal channels such that the destination also receives transmissions from the relay on its channel. The eavesdropper can overhear either one or both of the orthogonal channels. Inner and outer bounds on the secrecy capacity are developed for both the discrete memoryless and the Gaussian channel models. For the discrete memoryless case, the secrecy capacity is shown to be achieved by a partial decode-and-forward (PDF) scheme when the eavesdropper can overhear only one of the two orthogonal channels. Two new outer bounds are presented for the Gaussian model using recent capacity results for a Gaussian multi-antenna point-to-point channel with a multi-antenna eavesdropper. The outer bounds are shown to be tight for two sub-classes of channels. The first sub-class is one in which the source and relay are clustered and the and the eavesdropper receives signals only on the channel from the source and the relay to the destination, for which the PDF strategy is optimal. The second is a sub-class in which the source does not transmit to the relay, for which a noise-forwarding strategy is optimal.Comment: Submitted to Eurasip Journal on Wireless Communications and Networking special issue on Wireless physical layer security, Dec. 2008, Revised Jun. 200