Now showing items 3-22 of 47

  • 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 ...
  • Comment on "Diffusion on solif surfaces: anomalous is normal"-Reply 

    Sancho, Jose Maria; Lacasta Palacio, Ana María; Lindenberg, K.; Sokolov, Igor M.; Romero, A. H. (Americah Physical Society, 2005-05-12)
    Article
    Open Access
  • 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 ...
  • Diffusion coefficient in periodic and random potentials 

    Khoury, M; Gleeson, James P.; Sancho, Jose Maria; Lacasta Palacio, Ana María; Lindenberg, K (2009)
    Article
    Open Access
  • Diffusion on Solid Surface: anomalous is Normal 

    Sancho, Jose Maria; Lacasta Palacio, Ana María; Lindenberg, K.; Sokolov, Igor M.; Romero, A. H. (American Physical Society, 2004-06-23)
    Article
    Open Access
    We present a numerical study of classical particles diffusing on a solid surface. The particles’ motion is modeled by an underdamped Langevin equation with ordinary thermal noise. The particle-surface interaction is described ...
  • Dispersionless transport in a washboard potential 

    Lindenberg, K.; Sancho, Jose Maria; Lacasta Palacio, Ana María; Sokolov, Igor M. (American Physical Society, 2007-01-10)
    Article
    Open Access
    We study and characterize a new dynamical regime of underdamped particles in a tilted washboard potential. We find that for small friction in a finite range of forces the particles move essentially nondispersively, that ...
  • Domain growth in binary mixtures at low temperatures 

    Lacasta Palacio, Ana María; Hernández Machado, Aurora; Sancho, Jose Maria; Toral Garcés, Raúl (The American Physical Society, 1992-03-01)
    Article
    Open Access
    We have studied domain growth during spinodal decomposition at low temperatures. We have performed a numerical integration of the deterministic time-dependent Ginzburg-Landau equation with a variable, concentration-dependent ...
  • Dynamics of an inchworm nano-walker 

    Ciudad Álvarez, Aleix; Sancho, Jose Maria; Lacasta Palacio, Ana María (Elsevier Science, 2006-05-19)
    Article
    Open Access
    An inchworm processive mechanism is proposed to explain the motion of dimeric molecular motors such as kinesin.We present here preliminary results for this mechanism focusing on observables like mean velocity, coupling ...
  • 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 ...
  • Effects of domain morphology in phase-separation dynamics at low temperature. 

    Lacasta Palacio, Ana María; Sancho, Jose Maria; Hernández Machado, Aurora; Toral, Raul. (American Physical Society, 1993-09-01)
    Article
    Open Access
    We present numerical results of the deterministic Ginzburg-Landau equation with a concentration-dependent diffusion coefficient, for different values of the volume fraction phi of the minority component. The morphology of ...
  • Escape over a potential barrier driven by colored noise: large but finite correlation time 

    de la Rubia, Francisco Javier; Peacock-López, E.; Tsironis, G P; Lindenberg, Katja; Ramírez de la Piscina Millán, Laureano; Sancho, Jose Maria (1988)
    Article
    Open Access
    The recent theory of Tsironis and Grigolini for the mean first-passage time from one metastable state to another of a bistable potential for long correlation times of the noise is extended to large but finite correlation times.
  • 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. ...
  • First-passage time in a bistable potential with colored noise 

    Ramírez de la Piscina Millán, Laureano; Sancho, Jose Maria; de la Rubia, Francisco Javier; Lindenberg, Katja; Tsironis, G P (1989-08-15)
    Article
    Open Access
    A precise digital simulation of a bistable system under the effect of colored noise is carried out. A set of data for the mean first-passage time is obtained. The results are interpreted and compared with presently available ...
  • First-passage times for a marginal state driven by colored noise 

    Ramírez de la Piscina Millán, Laureano; Sancho, Jose Maria (The American Physical Society, 1991-01-18)
    Article
    Open Access
    The dynamical process through a marginal state (saddle point) driven by colored noise is studied. For small correlation time of the noise, the mean first-passage time and its variance are calculated using standard methods. ...
  • Fluctuations in domain growth: Ginzburg-Landau equations with multiplicative noise 

    Ramírez de la Piscina Millán, Laureano; Sancho, Jose Maria; Hernández Machado, Aurora (The American Physical Society, 1993-07-01)
    Article
    Open Access
    Ginzburg-Landau equations with multiplicative noise are considered, to study the effects of fluctuations in domain growth. The equations are derived from a coarse-grained methodology and expressions for the resulting ...
  • From subdiffusion to superdiffusion of particles on solid surfaces 

    Lacasta Palacio, Ana María; Sancho, Jose Maria; Sokolov, Igor M.; Lindenberg, K. (American Physical Society, 2004-11-15)
    Article
    Open Access
    We present a numerical and partially analytical study of classical particles obeying a Langevin equation that describes diffusion on a surface modeled by a two dimensional potential. The potential may be either periodic ...
  • Front and domain growth in the presence of gravity. 

    Lacasta Palacio, Ana María; Hernández-Machado, Aurora; Sancho, Jose Maria (American Physical Society, 1993-10-01)
    Article
    Open Access
    Front and domain growth of a binary mixture in the presence of a gravitational field is studied. The interplay of bulk (and surface) diffusion mechanisms is analyzed. An equation for the evolution of interfaces is derived ...
  • 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 ...