Now showing items 13-24 of 1552

  • Twists of opposite handedness on a scroll wave 

    Dähmlow, Patricia; Alonso Muñoz, Sergio; Baer, Markus; Hauser, Marcus (American Institute of Physics (AIP), 2013-06-05)
    Article
    Open Access
    The dynamic interaction of scroll waves in the Belousov-Zhabotinsky reaction with a vertically orientated gradient of excitability is studied by optical tomography. This study focuses on scroll waves, whose filaments were ...
  • Reentry near the percolation threshold in a heterogeneous discrete model for cardiac tissue 

    Alonso Muñoz, Sergio; Baer, Markus (American Institute of Physics (AIP), 2013-04-09)
    Article
    Open Access
    Arrhythmias in cardiac tissue are related to irregular electrical wave propagation in the heart. Cardiac tissue is formed by a discrete cell network, which is often heterogeneous. A localized region with a fraction of ...
  • Negative filament tension at high excitability in a model of cardiac tissue 

    Alonso Muñoz, Sergio; Panfilov, Alexander V (American Institute of Physics (AIP), 2008-05-28)
    Article
    Open Access
    One of the fundamental mechanisms for the onset of turbulence in 3D excitable media is negative filament tension. Thus far, negative tension has always been obtained in media under low excitability. For this reason, its ...
  • Negative filament tension in the Luo-Rudy model of cardiac tissue 

    Alonso Muñoz, Sergio; Panfilov, Alexander V (Institute of Physics (IOP), 2007-03-03)
    Article
    Open Access
    Scroll waves are vortices that occur in three-dimensional excitable media. Scroll waves have been observed in a variety of systems including cardiac tissue, where they are associated with cardiac arrhythmias. The disorganization ...
  • Galileo Ionospheric Correction Algorithm: An Optimization Study of NeQuick-G Galileo Ionospheric correction algorithm: An optimization study of NeQuick-G 

    Aragón Ángel, Maria Angeles; Zürn, M.; Rovira Garcia, Adrià (2019-11-24)
    Article
    Open Access
    At present most low-cost GNSS receivers operate one frequency in the L band. For themone of the largest error contributions is the delay of radio signals in the Ionosphere. NeQuick-Gisthe official ionospheric correction ...
  • Complex wave patterns in an effective reaction–diffusion model for chemical reactions in microemulsions 

    Alonso Muñoz, Sergio; John, Karin; Baer, Markus (American Institute of Physics (AIP), 2011-03-07)
    Article
    Open Access
    An effective medium theory is employed to derive a simple qualitative model of a pattern forming chemical reaction in a microemulsion. This spatially heterogeneous system is composed of water nanodroplets randomly distributed ...
  • Effective medium approach for heterogeneous reaction-diffusion media 

    Alonso Muñoz, Sergio; Baer, Markus; Kapral, Raymond (American Institute of Physics (AIP), 2009-12-01)
    Article
    Open Access
    An effective medium theory that can be used to calculate effective diffusion and reaction rate coefficients in random heterogeneous reaction-diffusion systems is described. The predictions of the theory are compared with ...
  • Dynamic mechanical relaxation in LaCe-based metallic glasses: influence of the chemical composition 

    Liu, Minna; Qiao, Jichao; Hao, Qi; Chen, Yinghong; Yao, Yao; Crespo Artiaga, Daniel; Pelletier, J. M. (Multidisciplinary Digital Publishing Institute (MDPI), 2019-09-17)
    Article
    Open Access
    The mechanical relaxation behavior of the (La0.5Ce0.5)65Al10(CoxCu1-x)25 at% (x = 0, 0.2, 0.4, 0.6, and 0.8) metallic glasses was probed by dynamic mechanical analysis. The intensity of the secondary ß relaxation increases ...
  • Mixtures of m-fluoroaniline with apolar aromatic molecules: Phase behaviour, suppression of H-bonded clusters, and local H-bond relaxation dynamics 

    Romanini, Michela; Barrio Casado, María del; Macovez, Roberto; Capaccioli, Simon; Tamarit Mur, José Luis (2019-12-15)
    Article
    Restricted access - publisher's policy
    We employ differential scanning calorimetry, IR spectroscopy, X-ray powder diffraction and dielectric spectroscopy to characterize binary mixtures of m-fluoroaniline (mFA), a rigid-molecule glass former, with two ...
  • Analyzing thermal convection in a two-dimensional circular annulus via spatio-temporal Koopman decomposition 

    Sánchez Umbría, Juan; Net Marcé, Marta; Vega de Prada, José Manuel (2020-01-15)
    Article
    Restricted access - publisher's policy
    This paper deals with the analysis of numerically obtained spatio-temporal data for thermal convection in a two-dimensional circular annulus. These data are post-processed using a recent method called the spatio-temporal ...
  • Exact results for the boundary energy of one-dimensional bosons 

    Reichert, Benjamin; Astrakharchik, Grigori; Petkovic, Aleksandra; Ristivojevic, Zoran (American Institute of Physics (AIP), 2019-12-17)
    Article
    Open Access
    We study bosons in a one-dimensional hard-wall box potential. In the case of contact interaction, the system is exactly solvable by the Bethe ansatz, as first shown by Gaudin in 1971. Although contained in the exact solution, ...
  • Defect reconstruction by non-destructive testing with laser induced ultrasonic detection 

    Mohamed Selim, Hossameldin; Delgado Prieto, Miquel; Trull Silvestre, José Francisco; Pico Vila, Rubén; Romeral Martínez, José Luis; Cojocaru, Crina (2020-02)
    Article
    Restricted access - publisher's policy
    This work envisages a detailed study of two-dimensional defect localization and reconstruction, using laser generated ultrasound and its application as a remotely controlled non-destructive testing method. As an alternative ...