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- Centro Brasileiro de Pesquisas FísicasBR11 papers
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6 papers · 1 filter
Effects of diffusion and particle size in a kinetic model of catalyzed reactions
T. G. Mattos, Fabio D. A. Aarao Reis
We study a model for unimolecular reaction on a supported catalyst including reactant diffusion and desorption, using analytical methods and scaling concepts. For rapid reactions,…
Multicritical Behavior in a Random-Field Ising Model under a Continuous-Field Probability Distribution
Octavio R. Salmon, Nuno Crokidakis, Fernando D. Nobre
A random-field Ising model that is capable of exhibiting a rich variety of multicritical phenomena, as well as a smearing of such behavior, is investigated. The model consists of a…
Fragmentation Experiment and Model for Falling Mercury Drops
P. M. C. de Oliveira, C. A. F. Leite, C. V. Chianca +2
The experiment consists of counting and measuring the size of the many fragments observed after the fall of a mercury drop on the floor. The size distribution follows a power-law f…
Profile measurement and simulation of a transverse dune field in the Lençóis Maranhenses
E. J. R. Parteli, V. Schwaemmle, H. J. Herrmann +2
In this work, we report measurements of the height profile of transverse dunes in the coastal dune field known as ``Lençóis Maranhenses'', northeastern Brazil. Our measurements sho…
A general creation-annihilation model with absorbing states
Wellington G. Dantas, Armando Ticona, Jurgen F. Stilck
A one dimensional non-equilibrium stochastic model is proposed where each site of the lattice is occupied by a particle, which may be of type A or B. The time evolution of the mode…
Relaxation to steady states and dynamical exponents in deposition models
F. D. A. Aarão Reis
Considering some deposition models with limited mobility, we show that the typical decay of the interface width to its saturation value is exponential, which defines the crossover…