Tsallis
Mostrando 13-24 de 56 artigos, teses e dissertações.
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13. Tsallis scaling in the long-range Ising chain with competitive interactions
A numerically efficient transfer matrix approach is used to investigate the validity of the Tsallis scaling hypothesis in the long-range Ising spin chain with competitive interactions. In this model, the interaction between two spins i and j placed r lattice steps apart is Ji, j = (-1)ζ(i,j)J0/rα, where ζ(i, j) is either 0 or 1. This procedure has succeed
Brazilian Journal of Physics. Publicado em: 2009-08
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14. Nonextensive relativistic nuclear and subnuclear equation of state
Following the basic prescriptions of the Tsallis' nonextensive relativistic thermodynamics, we investigate the relevance of nonextensive statistical effects on the relativistic nuclear and subnuclear equation of state. In this framework, we study the first order phase transition from hadronic to quark-gluon plasma phase by requiring the Gibbs conditions on t
Brazilian Journal of Physics. Publicado em: 2009-08
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15. q-distributions in complex systems: a brief review
The nonextensive statistical mechanics proposed by Tsallis is today an intense and growing research field. Probability distributions which emerges from the nonextensive formalism(q-distributions) have been applied to an impressive variety of problems. In particular, the role of q-distributions in the interdisciplinary field of complex systems has been expand
Brazilian Journal of Physics. Publicado em: 2009-08
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16. A nonextensive method for spectroscopic data analysis with artificial neural networks
In this paper we apply an evolving stochastic method to construct simple and effective Artificial Neural Networks, based on the theory of Tsallis statistical mechanics. Our aim is to establish an automatic process for building a smaller network with high classification performance. We aim to assess the utility of the method based on statistical mechanics for
Brazilian Journal of Physics. Publicado em: 2009-08
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17. Generalized entropy indices to measure α- and β-diversities of macrophytes
A family of entropy indices constructed in the framework of Tsallis entropy formalism is used to investigate ecological diversity. It represents a new perspective in ecology because a simple equation can incorporate all aspects of α-diversity, from richness to dominance and can be also related to a measure of species rarity. In addition, a generalized Kullb
Brazilian Journal of Physics. Publicado em: 2009-08
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18. Nonextensive statistical mechanics applied to protein folding problem: kinetics aspects
A reduced (stereo-chemical) model is employed to study kinetic aspects of globular protein folding process, by Monte Carlo simulation. Nonextensive statistical approach is used: transition probability p i j between configurations i → j is given by p i j =[1 +(1 - q)ΔGi j/kB T ]1/(1-q), where q is the nonextensive (Tsallis) parameter. The system model cons
Brazilian Journal of Physics. Publicado em: 2009-08
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19. Introducing the q-Theil index
Starting from the idea of Tsallis on non-extensive statistical mechanics and the q-entropy notion, we recall the Theil index Th and transform it into the Th q index. Both indices can be used to map onto themselves any time series in a non linear way. We develop an application of the Th q to the GDP evolution of 20 rich countries in the time interval [1950 -2
Brazilian Journal of Physics. Publicado em: 2009-08
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20. A characterization of the scientific impact of Brazilian institutions
In this paper we studied the research activity of Brazilian Institutions for all sciences and also their performance in the area of physics between 1945 and December 2008. All the data come from the Web of Science database for this period. The analysis of the experimental data shows that, within a nonextensive thermostatistical formalism, the Tsallis q-expon
Brazilian Journal of Physics. Publicado em: 2009-08
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21. Nonadditive entropy and nonextensive statistical mechanics -an overview after 20 years
Statistical mechanics constitutes one of the pillars of contemporary physics. Recognized as such - together with mechanics (classical, quantum, relativistic), electromagnetism and thermodynamics -, it is one of the mandatory theories studied at virtually all the intermediate-and advanced-level courses of physics around the world. As it normally happens with
Brazilian Journal of Physics. Publicado em: 2009-08
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22. Formação de caudas maxwellianas no Contexto da rotação estelar
Nesta Tese, analisamos a formação de caudas maxwellianas das distribuições de velocidades oriundas da rotação estelar no contexto da mecânica estatística de Boltzmann--Gibbs fora do equilíbrio. Nós partimos de um modelo unificado para a taxa de perda do momentum angular que, por sua vez, propiciou a construção de uma teoria geral para a desaceler
Publicado em: 2009
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23. Generalized Simulated Annealing Parameter Sweeping Applied to the Protein Folding Problem / Mapeamento de Parâmetros do Simulated Annealing Generalizado aplicado ao problema do Enovelamento de Proteínas
Com os rápidos avanços no seqüenciamento do genoma, a compreensão da estrutura de proteínas torna-se uma extensão crucial a esses progressos. Apesar dos significativos avanços tecnológicos recentes, a determinação experimental da estrutura terciária de proteínas ainda é muito lenta se comparada com a taxa de acúmulo de dados das seqüências de
Publicado em: 2009
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24. My friend Ricardo Ferreira, an impressive natural philosopher
Journal of the Brazilian Chemical Society. Publicado em: 2008