Now showing items 21-40 of 56

    • 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 ...
    • 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 ...
    • Generation and control of monodisperse bubble suspensions in microgravity 

      Bitlloch, Pau; Ruiz Martí, Xavier; Ramírez de la Piscina Millán, Laureano; Casademunt Viader, Jaume (2018-06-01)
      Article
      Open Access
      A new experimental setup for the generation of homogeneous, monodisperse bubble suspensions in turbulent duct flows in microgravity has been designed and tested in drop tower experiments. The setup provides independent ...
    • Generation and dynamics of a micro-bubble jet in microgravity 

      Casademunt, Jaume; Carrera, Jordi; Bitlloch, P.; Arias Calderón, Santiago; Ruiz, Xavier; González Cinca, Ricardo; Preyer, M.; Ramírez de la Piscina Millán, Laureano (2007-03)
      Working paper
      Open Access
    • Generation of spatiotemporal colored noise 

      García Ojalvo, Jordi; Ramírez de la Piscina Millán, Laureano; Sancho, Jose Maria (American Physical Society, 1992-10-01)
      Article
      Open Access
      We develop an algorithm to simulate a Gaussian stochastic process that is non-δ-correlated in both space and time coordinates. The colored noise obeys a linear reaction-diffusion Langevin equation with Gaussian white noise. ...
    • Growth of unstable interfaces in disordered media 

      Lacasta Palacio, Ana María; Ramírez de la Piscina Millán, Laureano; Casademunt, Jaume; Hernández-Machado, Aurora; Rodríguez, M. A. (American Physical Society, 1998-05-31)
      Article
      Open Access
      The effects of a disordered medium in the growth of unstable interfaces are studied by means of two local models with multiplicative and additive quenched disorder, respectively. For short times and large pushing ...
    • Heat diffusion anisotropy in dendritic growth: phase field simulations and experiments in liquid crystals 

      González Cinca, Ricardo; Ramírez de la Piscina Millán, Laureano; Casademunt Viader, Jaume; Hernández Machado, Aurora; Toth-Katona, T; Börzsönyi, T; Buka, A (1998-10)
      Article
      Restricted access - publisher's policy
      An anisotropic heat diffusion coefficient is introduced in order to study some interfacial growth phenomena. This anisotropy has been incorporated in a phase field model which has been studied numerically to reproduce some ...
    • Het diffusion anisotropy in dendritic growth: phase field simulations and experiments in liquid crystals 

      González Cinca, Ricardo; Ramírez de la Piscina Millán, Laureano; Casademunt, Jaume; Hernández Machado, A.; Toth-Katona, T.; Borzsonyi, T.; Buka, A. (Elsevier, 1998-10-15)
      Article
      Restricted access - publisher's policy
      An anisotropic heat diffusion coefficient is introduced in order to study some interfacial growth phenomena. This anisotropy has been incorporated in a phase field model which has been studied numerically to reproduce some ...
    • Higher order colored noise effects in multivariable systems. 

      Ramírez de la Piscina Millán, Laureano; Sancho, Jose Maria (American Physical Society, 1988-06-01)
      Article
      Open Access
      We extend the partial resummation technique of Fokker-Planck terms for multivariable stochastic differential equations with colored noise. As an example, a model system of a Brownian particle with colored noise is studied. ...
    • Interfacial instability induced by external fluctuations 

      Mozos, J. L.; Lacasta Palacio, Ana María; Ramírez de la Piscina Millán, Laureano; Hernández-Machado, Aurora (American Physical Society, 1996-02-01)
      Article
      Open Access
    • Langevin equations with multiplicative noise: application to domain growth 

      Sancho, Jose Maria; Hernández-Machado, A.; Ramírez de la Piscina Millán, Laureano; Lacasta Palacio, Ana María (Jagiellonian University, Polish Academy of Arts and Sciences, 1993-05-01)
      Article
      Open Access
      Langevin Equations of Ginzburg--Landau form, with multiplicative noise, are proposed to study the effects of fluctuations in domain growth. These equations are derived from a coarse-grained methodology. The Cahn--Hiliard--Cook ...
    • Microbubble injector: an experimental quantitative characterization 

      Arias Calderón, Santiago; Ruiz, Xavier; Casademunt, Jaume; Ramírez de la Piscina Millán, Laureano; González Cinca, Ricardo (2007)
      Conference report
      Open Access
    • Modeling of spatiotemporal patterns in bacterias colonies 

      Lacasta Palacio, Ana María; Rodríguez Cantalapiedra, Inma; Auguet Sangrá, Carlota E.; Peñaranda Ayllón, Angelina; Ramírez de la Piscina Millán, Laureano (American Physical Society, 1999-06-30)
      Article
      Open Access
      A diffusion-reaction model for the growth of bacterial colonies is presented. The often observed cooperative behavior developed by bacteria which increases their motility in adverse growth conditions is here introduced as ...
    • Molecular Na-channel excitability from statistical physics 

      Ramírez de la Piscina Millán, Laureano; Sancho Herrero, José María (2014-12-11)
      Article
      Open Access
      The excitable properties of the neural cell membrane is the driving mechanism of the neural pulses. Coordinated ionic fluxes across Na and K channels are the devices responsible of this function. Here we present a simple ...
    • Monodisperse bubble suspensions in turbulent flows in microgravity. Drop Tower experiments 

      Bitlloch, Pau; Ruiz Martí, Xavier; Ramírez de la Piscina Millán, Laureano; Casademunt, Jaume (2009)
      Conference lecture
      Open Access
    • Numerical algorithm for Ginzburg-Landau equations with multiplicative noise: application to domain growth 

      Ramírez de la Piscina Millán, Laureano; Sancho, Jose Maria; Hernández Machado, Aurora (The American Physical Society, 1993-07-01)
      Article
      Open Access
      We consider stochastic partial differential equations with multiplicative noise. We derive an algorithm for the computer simulation of these equations. The algorithm is applied to study domain growth of a model with a ...
    • Numerical study of the generation and dispersion of a bubble jet in microgravity 

      Bitlloch, Pau; Carrera, Jordi; Ruiz, Xavier; González Cinca, Ricardo; Ramírez de la Piscina Millán, Laureano; Casademunt, Jaume (International Astronautical Federation, 2006-10)
      Conference lecture
      Open Access
    • Oscillatory Instabilities in Directional Solidification with Solutal Convection. Transient Regime 

      Meca Álvarez, Esteban; Ramírez de la Piscina Millán, Laureano (2009-09-10)
      Conference lecture
      Open Access
    • 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 ...
    • Pattern formation during mesophase growth in a homologous series 

      Tóth Katona, T.; Börzsönyi, T.; Váradi, Z.; Szabon, J.; Buka, A.; González Cinca, Ricardo; Ramírez de la Piscina Millán, Laureano; Casademunt, Jaume; Hernández-Machado, Aurora (American Physical Society, 1996-08-01)
      Article
      Restricted access - publisher's policy
      Remarkable differences in the shape of the nematic-smectic-B interface in a quasi-two-dimensional geometry have been experimentally observed in three liquid crystals of very similar molecular structure, i.e., neighboring ...