Now showing items 1-12 of 155

    • Propagation malfunctions due to gap junction dysregulation 

      Rodríguez Cantalapiedra, Inma; Peñaranda Ayllón, Angelina; Echebarría Domínguez, Blas (2014)
      Conference lecture
      Open Access
      Gap junctions are membrane channels that connect the cytoplasm of adjacent cells allowing the cell-to-cell electrical coupling necessary for action potential propagation. Pathological conditions, such as malformations in ...
    • The timing statistics of spontaneous calcium release in cardiac myocytes 

      Asfaw, Mesfin; Álvarez Lacalle, Enrique; Shiferaw, Yohannes (2013-05-17)
      Article
      Open Access
      A variety of cardiac arrhythmias are initiated by a focal excitation that disrupts the regular beating of the heart. In some cases it is known that these excitations are due to calcium (Ca) release from the sarcoplasmic ...
    • Are SR Ca content fluctuations or SR refractoriness the key to atrial cardiac alternans?: insights from a human atrial model 

      Lugo Vélez, Carlos Antonio; Rodríguez Cantalapiedra, Inma; Peñaranda Ayllón, Angelina; Hove-Madsen, Leif; Echebarría Domínguez, Blas (2014-06-01)
      Article
      Restricted access - publisher's policy
      Despite the important role of electromechanical alternans in cardiac arrhythmogenesis, its molecular origin is not well understood. The appearance of calcium alternans has often been associated to fluctuations in the ...
    • Final architecture diploma projects in the analysis of the UPC buildings energy performance 

      Bosch González, Montserrat; Rodríguez Cantalapiedra, Inma; López Plazas, Fabián; Ruiz Martorell, Galdric (WITPress, 2006-07-31)
      Article
      Open Access
      Education is the base for achieving sustainable development. With the purpose of introducing sustainable challenges in terms of climate change, water and energy consumption, the Technical University of Catalonia (UPC) ...
    • On the validity of Avrami formalism in primary crystallization 

      Bruna Escuer, Pere; Crespo Artiaga, Daniel; González Cinca, Ricardo; Pineda Soler, Eloi (American Institute of Physics, 2006-09-30)
      Article
      Open Access
      Calorimetric data of primary crystallization is usually interpreted in the framework of the Kolmogorov Dokl. Akad. Nauk SSSR 1, 355 1937 , Johnson and Mehl Trans. AIME 135, 416 1939 , and Avrami J. Chem. Phys. 7, ...
    • Motor adaptation as a greedy optimization of error and effort 

      Emken, Jeremy L.; Benítez Iglesias, Raúl; Sideris, Athanasios; Bobrow, James E.; Reinkensmeyer, David J. (The American Physiological Society, 2007-03-31)
      Article
      Restricted access - publisher's policy
      thought of as a process in which the nervous system learns to anticipate the environmental forces to eliminate kinematic error. Here we show that motor adaptation can more generally be modeled as a process in which the ...
    • Human-robot cooperative movement training: learning a novel sensory motor transformation during walking with robotic assistance-as-needed 

      Emken, Jeremy L.; Benítez Iglesias, Raúl; Reinkensmeyer, David J. (BioMed Central Ltd., 2007-03-31)
      Article
      Open Access
      Background A prevailing paradigm of physical rehabilitation following neurologic injury is to "assist-as-needed" in completing desired movements. Several research groups are attempting to automate this principle with ...
    • Mechanisms for initiation of cardiac discordant alternans 

      Echebarría Domínguez, Blas; Karma, Alain (Springer, 2007-07-31)
      Article
      Restricted access - publisher's policy
      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 ...
    • Amplitude equation approach to spatiotemporal dynamics of cardiac alternans 

      Echebarría Domínguez, Blas; Karma, Alain (American Physical Society, 2007-11-30)
      Article
      Open Access
      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 ...
    • Robust unsupervised detection of action potentials with probabilistic models 

      Benítez Iglesias, Raúl; Nenadic, Zoran (Institute of Electrical and Electronics Engineers, 2008-04-30)
      Article
      Restricted access - publisher's policy
      We develop a robust and fully unsupervised algorithm for the detection of action potentials from extracellularly recorded data. Using the continuous wavelet transform allied to probabilistic mixture models and Bayesian ...
    • Coriolis effects on fingering patterns under rotation 

      Alvarez-Lacalle, Enrique; Gadelha, Hermes; Miranda, José A. (American Physical Society, 2008-09-30)
      Article
      Open Access
      The development of immiscible viscous fingering patterns in a rotating Hele-Shaw cell is investigated. We focus on understanding how the time evolution and the resulting morphologies are affected by the action of the ...
    • Unsolved problems of surface diffusion at low friction 

      Lindenberg, K.; Lacasta Palacio, Ana María; Sancho Herrero, Jose Maria; Romero, A. H. (American Institute of Physics, 2005-11-30)
      Article
      Restricted access - publisher's policy
      Surface transport and diffusion at low damping reveals a number of unexplained or at least not systematically explained behaviors. Here we present two problems that require further study for a full understanding. One ...