Universality Class
Mostrando 13-24 de 35 artigos, teses e dissertações.
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13. A strategy to study confinement in QCD
The order and the universality class of the deconfining phase transition can provide insight into the mechanism of color confinement, in particular for Nf = 2. The mechanism of confinement by monopole condensation is reviewed.
Brazilian Journal of Physics. Publicado em: 2007-03
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14. EmoÃÃes e estratÃgias de coping frente à morte de crianÃas em situaÃÃo de rua e de nÃvel socioeconÃmico mÃdio / Emotions and coping estrategies concerning death in street children and from the middle socioeconomic class
The objective of this research is to investigate the emotions and coping strategies concerning death in street children and children from the middle socioeconomic class (MSEC), aged 7 to 12, considering the influence of age, gender, and schooling. The concept of biological death is seen as complex, multidimensional, covering ideas such as universality, non-f
Publicado em: 2007
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15. ComputaÃÃo dendrÃtica: uma abordagem de fÃsica estatÃstica
No campo da neurociÃncia computacional, a atividade elÃtrica dos neurÃnios à tradicionalmente modelada por equaÃÃes diferenciais nÃo-lineares acopladas, representando a evoluÃÃo do potencial de membrana e certas variÃveis relacionadas Ãs condutÃncias iÃnicas presentes no sistema. Uma tendÃncia recente consiste na extensÃo desta estratÃgia de
Publicado em: 2007
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16. Critical behavior of the spin-3/2 Blume-Capel model on a random two-dimensional lattice
We investigate the critical properties of the spin-3/2 Blume-Capel model in two dimensions on a random lattice with quenched connectivity disorder. The disordered system is simulated by applying the cluster hybrid Monte Carlo update algorithm and re-weighting techniques. We calculate the critical temperature as well as the critical point exponents gamma/
Brazilian Journal of Physics. Publicado em: 2006-09
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17. A new method to study stochastic growth equations: application to the Edwards-Wilkinson equation
In this work we introduce a method to study stochastic growth equations, which follows a dynamics based on cellular automata modeling. The method defines an interface growth process that depends on height differences between neighbors. The growth rules assign a probability p i(t) for site i to receive a particle at time t, where p i(t) = rho exp[
Brazilian Journal of Physics. Publicado em: 2006-09
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18. Propriedades críticas estáticas e dinâmicas de modelos com simetria contínua e do modelo Z(5) / Static and dynamic critical properties of models with continuous symmetry and of the Z(5) model
Neste trabalho, nós investigamos o comportamento crítico dinâmico de três modelos estatísticos utilizando simulações Monte Carlo em tempos curtos. Inicialmente, estudamos os modelos tridimensionais de dupla-troca e de Heisenberg. O expoente dinâmico de persistência global, bem como o expoente z são estimados através de duas técnicas. Para obter o
Publicado em: 2006
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19. Dinâmica crítica de modelos de spin, autômatos celulares e polipeptídeos. / Critical dynamics of spin models, cellular automata and polypeptides.
In this work we investigated dynamic properties of statistical mechanical models at criticality. At first, using the concepts of global persistence and anomalous dimension of initial magnetization, we showed that the Baxter-Wu model does not belong to the same universality class as 4-state Potts model and Ising with multispin interaction in one direction. In
Publicado em: 2005
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20. Local persistence and blocking in the two-dimensional blume-capel model
In this paper we study the local persistence of the two-dimensional Blume-Capel Model by extending the concept of Glauber dynamics. We verify that for any value of the ratio alpha = D/J between anisotropy D and exchange J the persistence shows a power law behavior. In particular for alpha < 0 we find a persistence exponent thetal = 0:2096(13), i.e. in the Is
Brazilian Journal of Physics. Publicado em: 2004-12
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21. Monte Carlo study of the spin-1 Baxter-Wu model
The two-dimensional spin-1 Baxter-Wu model is studied by using Monte Carlo simulations. The standard single-spin-flip Metropolis algorithm is used to generate the configurations from which the order parameter, specific heat and magnetic susceptibility are measured. The finite-size scaling procedure is employed in order to get the critical behavior. Extensive
Brazilian Journal of Physics. Publicado em: 2004-06
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22. A reforma da política previdenciária brasileira na década de 90: um estudo de suas determinações sócio-históricas
The present thesis, with the title "The reform of Brazilian Social Security Policy in the 1990s decade - a study of its social-historical determinations", aimed to perceive and understand some of the exogenous and endogenous components essential for the comprehension of the reform process. The exogenous determinations, universal as they are, have as their co
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/11/2003
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23. Critical behavior of a bounded Kardar-Parisi-Zhang equation
A host of spatially extended systems, both in physics and in other disciplines, are well described at a coarse-grained scale by a Langevin equation with multiplicative-noise. Such systems may exhibit nonequilibrium phase transitions, which can be classified into universality classes. Here we study in detail one such class that can be mapped into a Kardar-Par
Brazilian Journal of Physics. Publicado em: 2003-09
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24. Exact solution for the self-organized critical rainfall model
This work presents an analytical investigation for a Self-Organized Criticality abelian model that describes basic properties of rainfall phenomena. The knowledge of the exact solution for the probability that a site topples when mass is added to any other site of the lattice leads to a large number properties of the model, including the exponent of the powe
Brazilian Journal of Physics. Publicado em: 2003-09