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Search Results: 1 - 10 of 228753 matches for " Marcos C. Verges "
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A Extended Cosmological Cardy-Verlinde Formula
Thiago G. Prado,Marcos C. Verges
Physics , 2010,
Abstract: E. Verlinde obtained a generalized formula for the entropy of a conformal field theory. For this we consider a (n+1) dimensional closed radiation dominated FLWR in the context of the holographic principle. In this work we construct a extension of the Cardy-Verlinde formula to positive cosmological constant spaces (dS spaces) with arbitrary topology
Riddling and chaotic synchronization of coupled piecewise-linear Lorenz maps
Marcos C. Verges,Rodrigo Frehse Pereira,Sergio R. Lopes,Ricardo L. Viana,Tomasz Kapitaniak
Physics , 2009, DOI: 10.1016/j.physa.2009.02.015
Abstract: We investigate the parametric evolution of riddled basins related to synchronization of chaos in two coupled piecewise-linear Lorenz maps. Riddling means that the basin of the synchronized attractor is shown to be riddled with holes belonging to another basin in an arbitrarily fine scale, which has serious consequences on the predictability of the final state for such a coupled system. We found that there are wide parameter intervals for which two piecewise-linear Lorenz maps exhibit riddled basins (globally or locally), which indicates that there are riddled basins in coupled Lorenz equations, as previously suggested by numerical experiments. The use of piecewise-linear maps makes it possible to prove rigorously the mathematical requirements for the existence of riddled basins.
Parametric evolution of unstable dimension variability in coupled piecewise-linear chaotic maps
Rodrigo Frehse Pereira,Marcos C. Verges,Ricardo L. Viana,Sergio R. Lopes,Sandro Ely de Souza Pinto
Physics , 2010,
Abstract: In presence of unstable dimension variability numerical solutions of chaotic systems are valid only for short periods of observation. For this reason, analytical results for systems that exhibit this phenomenon are needed. Aiming to go one step further in obtaining such results, we study the parametric evolution of unstable dimension variability in two coupled bungalow maps. Each of these maps presents intervals of linearity that define Markov partitions, which are recovered for the coupled system in the case of synchronization. Using such partitions we find exact results for the onset of unstable dimension variability and for contrast measure, which quantifies the intensity of the phenomenon in terms of the stability of the periodic orbits embedded in the synchronization subspace.
Comparaison de méthode: A propos de l'article 'Apport des modèles graphiques gaussiens en analyse de similitude'
Verges, Pierre,Flament, C.
Papers on Social Representations , 1997,
Abstract:
A note on the 3D Brans-Dicke theory
T. G. do Prado,V. S. Mendes,M. C. Verges
Physics , 2010,
Abstract: Since the evidence for an accelerated universe and the gap of 70% in the total energy, collected by WMAP, search for alternatives for the general relativity is an important issue, for this theory is not suited for these new phenomena. A particular alternative is the Brans-Dicke theory which has being allowing inspiring results, for example, concerning k-essence type fields in 4 dimensions. However, this theory is almost unexplored in the context of the dimensional reduction of the theory in 3 dimensions. In this work, we address some problems in this dimensional reduction, namely, evaluation of the deceleration parameter of the universe described by the 3 dimensional Brans-Dicke with and without matter. In both cases, we see that it is not possible to consider the theory as a model of k-essence descrybing the dark energy, but it can be considered as descrybing the dark matter.
Réaction à l'article de J.-M. Ramos
Verges, Pierre
Papers on Social Representations , 1994,
Abstract:
The one-particle Green's function of one.dimensional insulating materials
M. C. Refolio,J. M. Lopez Sancho,J. Rubio,J. A. Verges
Physics , 2004,
Abstract: The single particle spectral-weight function (SWF) of the ionic Hubbard model at half filling is calculated in the cluster perturbation theory approximation. An abrupt change of regime in the low-energy region, near the chemical potential, is found at a critical value, $U_{c}$, of the coupling constant (Hubbard $U$). The SWF at the Fermi points $k_{F}$=$\pm{\pi}/2$ jumps, as $U$ increases, from a two-peak structure, the gap edges, to a four-peak structure accompanied by a (non-vanishing) minimum of the charge-gap. The two inner peaks of this structure show very small dispersion (flat bands) away from the Fermi points, whereas the outer peaks mark the edges of the Hubbard bands. No other signatures of abrupt change are detected in the SWF. The two regimes are physically realized in the angle-resolved photoelectron spectra of $(TaSe_{4})_{2}I$, and the blue-bronze $K_{0.3}MoO_{3}$, respectively.
Noyau central, saillance et propriétés structurales
Verges, Pierre,Tyszka, Tadeusz,Verges, Pierrette
Papers on Social Representations , 1994,
Abstract:
Moorings: Indian Ocean Creolizations
Francoise Verges,Carpanin Marimoutou
PORTAL : Journal of Multidisciplinary International Studies , 2012,
Abstract: In this essay written in 2004, Fran oise Vergès and Carpanin Marimoutou explore the ways in which processes and practices of creolization occurred in Réunion Island. They argue that creolization must be analyzed within the historical, political and cultural context in which they emerge. Vergès and Marimoutou reflect on these processes -- frictions, conflicts, and exchanges among slaves, settlers, migrants, and indentured workers from Madagascar, Mozambique, Gujarat, Bengal, France, Tamil Nadu, Southern China, Malaysia, Vietnam..., who were brought or came on the uninhabited island, colonized by the French in the 17th century. The authors also looked at the post-colonial moment, the French policies of assimilation and repression in the 1960s-1970s. For them, vernacular cultural practices and memories of struggle continue to work as counter strategies against local and national reactionary politics. In their conclusion, Vergès and Marimoutou look at the current form of globalization and its consequences on processes of creolization.
From exclusion to self-inclusion of women in ICT. Motivations, enablers and mechanisms of self-inclusion De la exclusión a la autoinclusión de las mujeres en las TIC. Motivaciones, posibilitadores y mecanismos de autoinclusión
Núria Verges Bosch
Athenea Digital , 2012,
Abstract: Research on the participation of women in ICT shows that the gender digital divide persists. Given that, most studies continue to focus on explaining the mechanisms of exclusion of women from ICT. In this article I propose a paradigm shift from exclusion to inclusion. I go beyond inclusion by conceptualizing and analysing the process of self-inclusion of women in ICT from a purposive sample of women artistic and computer technologists. The results are based on the qualitative analysis of interviews and focus groups, in which I aim to answer three main questions: What motivated their self-inclusion? What enablers did they encounter? What mechanisms did they follow and activate to self-include in ICT? The main results show, first, that the motivations for pleasure are predominant, but often complemented by other utilitarian motivations. Second, a set of enablers facilitate women’s self-inclusion in ICT, including gender policies. Finally, I discuss a number of mechanisms of self-inclusion that go beyond learning that include doing and undoing gender. La investigación sobre la participación de las mujeres en las TIC alerta de que la brecha digital de género persiste. Frente a ello, la mayoría de estudios se siguen concentrando en explicar los mecanismos de exclusión de las mujeres de las TIC. En este artículo propongo un giro del paradigma de la exclusión al paradigma de la inclusión para avanzar en esta cuestión. Voy más allá conceptualizando y analizando el proceso de autoinclusión de las mujeres en las TIC a partir de una muestra intencionada de tecnólogas artísticas e informáticas. Los resultados se basan en el análisis cualitativo de entrevistas y grupos de discusión y buscan responder a tres preguntas principales: Qué expresan que las ha motivado a autoincluirse en las TIC? Qué posibilitadores se alan que han ido encontrando? Qué mecanismos exponen que han ido siguiendo y activando para autoincluirse? Como principales resultados muestro, primeramente, que las motivaciones por placer se evidencian como predominantes, pero complementadas por motivaciones más utilitaristas. En segundo lugar, que un conjunto de posibilitadores han facilitado su autoinclusión, entre ellos las mismas políticas de género. Finalmente, expongo una serie de mecanismos de autoinclusión que van más allá del aprendizaje y que incluyen ir haciendo y deshaciendo género.
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