Enviaments recents

  • Langevin equation approach for slow dynamics in magnetic systems 

    Sancho, Jose Maria; Lacasta Palacio, Ana María; Torrent Serra, Maria del Carmen; García Ojalvo, Jordi; Tejeda Gómez, José Arturo (Elsevier Science, 1993)
    Article
    Accés restringit per política de l'editorial
    We present a magnetic model based on a Langevin equation which exhibits slow relaxation dynamics of ln(t) type. The system is composed of magnetic particles which are under the influence of a local potential and interact ...
  • The timing statistics of spontaneous calcium release in cardiac myocytes 

    Asfaw, Mesfin; Álvarez Lacalle, Enrique; Shiferaw, Yohannes (2013-05-17)
    Article
    Accés obert
    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
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    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
    Accés obert
    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
    Accés obert
    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
    Accés restringit per política de l'editorial
    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
    Accés obert
    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
    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 ...
  • 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 ...
  • Robust unsupervised detection of action potentials with probabilistic models 

    Benítez Iglesias, Raúl; Nenadic, Zoran (Institute of Electrical and Electronics Engineers, 2008-04-30)
    Article
    Accés restringit per política de l'editorial
    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 ...

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