Now showing items 1-14 of 14

  • A+B=0 reaction with different initial patterns 

    Sancho, Jose Maria; Romero, A. H.; Lindenberg, Katja; Sagués Mestre, Francesc; Reigada Sanz, R.; Lacasta Palacio, Ana María (American Chemical Society, 1996-10-10)
    Article
    Restricted access - publisher's policy
    We present a detailed study of the chemical reaction A + B f 0 in two dimensions for different initial distributions of reactants as characterized by the structure function. We argue that the long-wavelength components ...
  • Coherence and anticoherence resonance tuned by noise 

    Lacasta Palacio, Ana María; Sagués Mestre, Francesc; Sancho, Jose Maria (American Physical Society, 2002-10-24)
    Article
    Open Access
    We present numerical evidence and a theoretical analysis of the appearance of anticoherence resonance induced by noise, not predicted in former analysis of coherence resonance. We have found that this phenomenon occurs for ...
  • Competitive evaporation in arrays of droplets 

    Lacasta Palacio, Ana María; Sokolov, Igor M.; Sancho, Jose Maria; Sagués Mestre, Francesc (American Physical Society, 1998-05-31)
    Article
    Open Access
    We consider the evaporation of periodic arrays of initially equal droplets in two-dimensional systems with open ~absorbing! boundaries. Our study is based on the numerical solution of the Cahn-Hilliard equation. We show ...
  • Effective diffusion in a stochastic velocity field 

    Careta i Pons, Agustí; Sagués Mestre, Francesc; Ramírez de la Piscina Millán, Laureano; Sancho, Jose Maria (Springer Verlag, 1993-04-01)
    Article
    Restricted access - publisher's policy
    Analytical results are derived for the effective dispersion of a passive scalar in a stochastic velocity field evolving in a fast time scale. These results are favorably compared with direct computer simulation of ...
  • Evaporation and coarsening dynamics with open boundaries 

    Lacasta Palacio, Ana María; Sagués Mestre, Francesc; Sancho, Jose Maria; Sokolov, Igor M. (Americah Physical Society, 1999-01-31)
    Article
    Open Access
    We present a study of the evaporation dynamics of a substance undergoing a coarsening process. The system is modeled by the Cahn-Hilliard equation with absorbing boundaries. We have found that the dynamics, although of ...
  • Exported oscillator competition: a concept to analyze complex rhythms 

    Lacasta Palacio, Ana María; Sancho, Jose Maria; Sagués Mestre, Francesc (American Physical Society, 2005)
    Article
    Open Access
    We study the interaction between two independent nonlinear oscillators competing through a neutral excitable element. The first oscillator, completely deterministic, acts as a normal pacemaker sending pulses to the neutral ...
  • External fluctuations in front propagation 

    Armero Rovira, J.; Sancho, Jose Maria; Casademunt, Jaume; Lacasta Palacio, Ana María; Ramírez de la Piscina Millán, Laureano; Sagués Mestre, Francesc (American Physical Society, 1996-04-01)
    Article
    Open Access
    We study the effects of external noise in a one-dimensional model of front propagation. Noise is introduced through the fluctuations of a control parameter leading to a multiplicative stochastic partial differential equation. ...
  • Front propagation in spatially modulated media 

    Armero, J.; Lacasta Palacio, Ana María; Ramírez de la Piscina Millán, Laureano; Casademunt, Jaume; Sancho, Jose Maria; Sagués Mestre, Francesc (American Physical Society, 1997-09-01)
    Article
    Open Access
    A two-dimensional reaction-diffusion front which propagates in a modulated medium is studied. The modulation consists of a spatial variation of the local front velocity in the transverse direction to that of the ...
  • Pattern and velocity selection of fronts propagating in modulated media 

    Armero, J.; Lacasta Palacio, Ana María; Ramírez de la Piscina Millán, Laureano; Casademunt, Jaume; Sancho, Jose Maria; Sagués Mestre, Francesc (EDP Sciences, 1996-02-01)
    Article
    Open Access
    We study the problem of pattern and velocity selection of morphologically stable two-dimensional fronts propagating in a spatially modulated medium. The generic system is governed by a local equation and evolves towards a ...
  • Percolation thresholds in chemical excitable media. 

    Sendiña-Nadal, I.; Roncaglia, D.; Vives, D.; Pérez Muñuzuri, Vicente; Gómez Gesteira, Moncho; Pérez Villar, Vicente; Echave, J.; Casademunt, Jaume; Ramírez de la Piscina Millán, Laureano; Sagués Mestre, Francesc (American Physical Society, 1998-08-31)
    Article
    Open Access
    The behavior of chemical waves advancing through a disordered excitable medium is investigated in terms of percolation theory and autowave properties in the framework of the light-sensitive Belousov-Zhabotinsky reaction. ...
  • Phase separation dynamics under stirring 

    Lacasta Palacio, Ana María; Sancho, Jose Maria; Sagués Mestre, Francesc (American Physical Society, 1995-08-01)
    Article
    Open Access
    Phase separation dynamics in the presence of externally imposed stirring is stuidied. The stirring is assumed independent of the concentration and it is generated with a well-defined energy spectrum. The domain growth ...
  • Study of a bimolecular annihilation process for coarsening reactants 

    Lacasta Palacio, Ana María; Sagués Mestre, Francesc; Sokolov, Igor M.; Sancho, Jose Maria (American Institute of Physics, 1999-04-30)
    Article
    Open Access
    We consider the spatio-temporal behavior of the A+B→0 bimolecular reaction in a system where both reactants tend to segregate into separated phases. Our study is based on the numerical solution of a pair of reaction–diffusion ...
  • Wave competition in excitable modulated media 

    Sendiña-Nadal, I.; Gómez Gesteira, Moncho; Pérez Muñuzuri, Vicente; Pérez Villar, Vicente; Armero, J.; Ramírez de la Piscina Millán, Laureano; Casademunt, Jaume; Sancho, Jose Maria; Sagués Mestre, Francesc (American Physical Society, 1997-12-31)
    Article
    Open Access
    The propagation of an initially planar front is studied within the framework of the photosensitive Belousov- Zhabotinsky reaction modulated by a smooth spatial variation of the local front velocity in the direction perpendicular ...
  • Wave propagation in a medium with disordered excitability 

    Sendiña-Nadal, I.; Pérez Muñuzuri, Alberto; Vives, D.; Pérez Muñuzuri, Vicente; Casademunt, Jaume; Ramírez de la Piscina Millán, Laureano; Sancho, Jose Maria; Sagués Mestre, Francesc (American Physical Society, 1998-06-30)
    Article
    Open Access
    The effect of quenched disorder on the propagation of autowaves in excitable media is studied both experimentally and numerically in relation to the light-sensitive Belousov-Zhabotinsky reaction. The spatial disorder is ...