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The site-diluted Ising ferromagnet is investigated on a square lattice, within short-time-dynamics numerical simulations, for different site concentrations. The dynamical exponents θ and z are obtained and it is shown that these exponents do depend strongly on the disorder, exhibiting a clear breakdown of universality, characterized by relative variations… (More)

- G M Viswanathan, F Bartumeus, Sergey V Buldyrev, J Catalan, U L Fulco, Shlomo Havlin +4 others
- 2002

There has been growing interest in the study of LÃ evy ights observed in the movements of biological organisms performing random walks while searching for other organisms. Here, we approach the problem of what is the best statistical strategy for optimizing the encounter rate between " searcher " and " target " organisms—either of the same or of diierent… (More)

- U L Fulco, L R Da Silva, F D Nobre, L S Lucena
- 2003

The long-range bond-percolation problem, on a linear chain (d = 1), in the presence of diluted sites (with an occupancy probability p s for an active site) is studied by means of a Monte Carlo simulation. The occupancy probability for a bond between two active sites i and j, separated by a distance rij is given by pij = p/r α ij , where p represents the… (More)

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