Exploració per autor "Karma, Alain"

Ara es mostren els items 1-7 de 7

    • Amplitude equation approach to spatiotemporal dynamics of cardiac alternans 

      Echebarría Domínguez, Blas; Karma, Alain (American Physical Society, 2007-11-30)
      Article
      Accés obert
      Amplitude equations are derived that describe the spatiotemporal dynamics of cardiac alternans during periodic pacing of one- B. Echebarria and A. Karma, Phys. Rev. Lett. 88, 208101 2002 and twodimensional homogeneous ...

    • Crack front segmentation and facet coarsening in mixed-mode fracture 

      Chen, Chih-Hung; Cambonie, Tristan; Lazarus, Veronique; Nicoli, Matteo; Pons Rivero, Antonio Javier; Karma, Alain (2015-12-30)
      Article
      Accés obert
      A planar crack generically segments into an array of “daughter cracks” shaped as tilted facets when loaded with both a tensile stress normal to the crack plane (mode I) and a shear stress parallel to the crack front (mode ...

    • Helical crack-front instability in mixed-mode fracture 

      Pons Rivero, Antonio Javier; Karma, Alain (2010-03-04)
      Article
      Accés restringit per política de l'editorial
      [...]We show that the dynamically preferred unstable wavelength is governed by the balance of the destabilizing effect of far-field stresses and the stabilizing effect of cohesive forces on the process zone scale, and we ...

    • Instability and spatiotemporal dynamics of alternans in paced cardiac tissue 

      Echebarría Domínguez, Blas; Karma, Alain (2002)
      Article
      Accés obert
      We derive an equation that governs the spatiotemporal dynamics of small amplitude alternans in paced cardiac tissue. We show that a pattern-forming linear instability leads to the spontaneous formation of stationary or ...

    • Mechanisms for initiation of cardiac discordant alternans 

      Echebarría Domínguez, Blas; Karma, Alain (Springer, 2007-07-31)
      Article
      Accés restringit per política de l'editorial
      Electrical alternans, defined as a beat-to-beat change in the duration of the excited phase of cardiac cells, is among the known precursors of sudden cardiac death. It may appear as concordant (all the tissue presenting ...

    • Onset of sidebranching in directional solidification 

      Echebarría Domínguez, Blas; Karma, Alain; Gurevich, Sebastian (2010-02-26)
      Article
      Accés obert
      We use a computationally efficient phase-field formulation [B. Echebarria et al., Phys. Rev. E 70, 061604 (2004)] to investigate the origin and dynamics of sidebranching in directional solidification for realistic ...

    • Spatiotemporal control of cardiac alternans 

      Echebarría Domínguez, Blas; Karma, Alain (Institute of Physics (IOP), 2002)
      Article
      Accés restringit per política de l'editorial
      Electrical alternans are believed to be linked to the onset of life-threatening ventricular arrhythmias and sudden cardiac death. Recent studies have shown that alternans can be suppressed temporally by dynamic feedback ...