Enviaments recents

  • Particle-cluster aggregation with dipolar interactions 

    Pastor Satorras, Romualdo; Rubí, J. Miguel (1995-06)
    Article
    Accés obert
    The properties of aggregates generated from an off-lattice, two-dimensional, particle-cluster aggregation model with dipolar interparticle interactions have been investigated. The fractal dimension seems to be a monotonically ...
  • Branch distribution in diffusion-limited aggregation: a maximum entropy approach 

    Pastor Satorras, Romualdo; Wagensberg, Jorge (1996-02-15)
    Article
    Accés restringit per política de l'editorial
    A new approach to the branching structure of diffusion-limited aggregation (DLA) clusters is proposed, in which the stress is laid not on the (traditionally used) order of the branches, but on their mass. The branch ...
  • Multifractal properties of power-law time sequences: application to rice piles 

    Pastor Satorras, Romualdo (1997-11)
    Article
    Accés obert
    We study the properties of time sequences extracted from a self-organized critical system, within the framework of the mathematical multifractal analysis. To this end, we propose a fixed-mass algorithm, well suited to deal ...
  • Fractal properties of cluster of colloidal magnetic particles 

    Pastor Satorras, Romualdo; Rubí Capaceti, José Miguel (1998-05)
    Article
    Accés restringit per política de l'editorial
    We have studied the properties of clusters of colloidal magnetic particles generated from a 2D aggregation model with dipolar interparticle interactions. Particles diffuse off-lattice, experiencing dipolar 1 with the already ...
  • Stochastic equation for the erosion of inclined topography 

    Pastor Satorras, Romualdo; Rothman, Daniel H. (American Institute of Physics (AIP), 1998-05-11)
    Article
    Accés obert
    We present a stochastic equation to model the erosion of topography with fixed inclination. The inclination causes the erosion to be anisotropic. A zero-order consequence of the anisotropy is the dependence of the prefactor ...
  • Long-range-interaction induced ordered structures in deposition processes 

    Pastor Satorras, Romualdo; Rubí Capaceti, José Miguel (American Institute of Physics (AIP), 1998-06-15)
    Article
    Accés obert
    We present a new model of sequential adsorption in which the adsorbing particles experience dipolar interactions. We show that in the presence of these long-range interactions, highly ordered structures in the adsorbed ...
  • The maximum entropy principle and the nature of fractals 

    Pastor Satorras, Romualdo; Wagensberg, Jorge (1998-06-19)
    Article
    Accés obert
    We apply the Principle of Maximum Entropy to the study of a general class of deterministic fractal sets. The scaling laws peculiar to these objects are accounted for by means of a constraint concerning the average content ...
  • Scaling of a slope: the erosion of tilted landscapes 

    Pastor Satorras, Romualdo; Rothman, Daniel H. (1998-11)
    Article
    Accés obert
    We formulate a stochastic equation to model the erosion of a surface with fixed inclination. Because the inclination imposes a preferred direction for material transport, the problem is intrinsically anisotropic. At zeroth ...
  • Kinetic growth of field-oriented chains in dipolar colloidal solutions 

    Miguel Lopez, M. Del Carmen; Pastor Satorras, Romualdo (1999-01)
    Article
    Accés obert
    Experimental studies on the irreversible growth of field-induced chains of dipolar particles suggest an asymptotic power-law behavior of several relevant quantities. We introduce a Monte Carlo model of chain growth that ...
  • Universality classes in directed sandpile models 

    Pastor Satorras, Romualdo; Vespignani, Alessandro (1999-07-27)
    Article
    Accés restringit per política de l'editorial
    We perform large-scale numerical simulations of a directed version of the two-state stochastic sandpile model. Numerical results show that this stochastic model defines a new universality class with respect to the Abelian ...
  • Growth of oriented chains in dipolar colloids 

    Miguel Lopez, M. Del Carmen; Pastor Satorras, Romualdo (1999-11-29)
    Article
    Accés restringit per política de l'editorial
    We investigate the dynamics of the irreversible aggregation of linear rigid chains oriented along a preferred direction. We propose a Monte Carlo model, whose key ingredient is a logarithmically corrected anisotropic ...
  • Ballistic adsorption of colloidal magnetic particles 

    Pastor Satorras, Romualdo; Rubí Capaceti, José Miguel (1999-11-29)
    Article
    Accés restringit per política de l'editorial
    We present a new model of sequential adsorption in which the adsorbing particles experience anisotropic dipolar interactions. These long-range interactions induce highly ordered structures in the adsorbed layer at low ...

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