Ara es mostren els items 1-14 de 14

  • A new approach to the vakonomic mechanics 

    Llibre Saló, Jaume; Ramírez Ros, Rafael; Sadovskaia Nurimanova, Natalia Guennadievna (2014-11-01)
    Article
    Accés restringit per política de l'editorial
    The aim of this paper was to show that the Lagrange-d'Alembert and its equivalent the Gauss and Appel principle are not the only way to deduce the equations of motion of the nonholonomic systems. Instead of them we consider ...
  • Activity driven modeling of time varying networks 

    Perra, N.; Gonçalves, B.; Pastor Satorras, Romualdo; Vespignani, Alessandro (2012-06-25)
    Article
    Accés restringit per política de l'editorial
    Network modeling plays a critical role in identifying statistical regularities and structural principles common to many systems. The large majority of recent modeling approaches are connectivity driven. The structural ...
  • Calcium Alternans is Due to an Order-Disorder Phase Transition in Cardiac Cells 

    Álvarez Lacalle, Enrique; Echebarría Domínguez, Blas; Spalding, Jon; Shiferaw, Yohannes (2015-03-12)
    Article
    Accés obert
    Electromechanical alternans is a beat-to-beat alternation in the strength of contraction of a cardiac cell, which can be caused by an instability of calcium cycling. Using a distributed model of subcellular calcium we show ...
  • Characterization of mechanical relaxation in a Cu-Zr-Al metallic glass 

    Liu, Chaoren; Pineda Soler, Eloi; Crespo Artiaga, Daniel (2015-09-15)
    Article
    Accés restringit per política de l'editorial
    The temperature dependence of the relaxation times of Cu46Zr46Al8 glass was measured by means of mechanical spectroscopy and static stress-relaxation measurements. The weak intensity of secondary relaxation in this alloy ...
  • Combined low-thrust propulsion and invariant manifold trajectories to capture NEOs in the Sun-Earth circular restricted three-body problem 

    Mingotti, Giorgio; Sánchez Cuartielles, Joan Pau; McInnes, Colin (2014-11-01)
    Article
    Accés restringit per política de l'editorial
    In this paper, a method to capture near-Earth objects (NEOs) incorporating low-thrust propulsion into the invariant manifolds technique is investigated. Assuming that a tugboat-spacecraft is in a rendez-vous condition with ...
  • Comparing autorefractors for measurement of accommodation 

    Aldaba Arévalo, Mikel; Gómez López, Selena; Vilaseca Ricart, Meritxell; Pujol Ramo, Jaume; Arjona Carbonell, Mª Montserrat (2015-10-01)
    Article
    Accés obert
    Purpose To compare the static and dynamic accommodative responses measured with the WAM-5500 and the PowerRef-II autorefractors.; Methods The dynamic and static monocular accommodative responses were measured with the ...
  • Conditions for existence of equilibria of systems with constant power loads 

    Sanchez Acevedo, Santiago; Ortega, Romeo; Griñó Cubero, Robert; Bergna, Gilbert; Molinas Cabrera, Marta (2014-07-01)
    Article
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    In this paper we investigate the sine qua non condition of existence of equilibria for electrical systems with external (AC or DC) sources furnishing constant power to the loads, which is a scenario encountered in modern ...
  • Modeling nanosized single molecule objects: dendronized polymers adsorbed onto mica 

    Bertran Cànovas, Òscar; Zhang, Baozhong; Schlüter, A. Dieter; Kroeger, Matin; Alemán Llansó, Carlos (2015-02-19)
    Article
    Accés obert
    We attempt to provide direct evidence for the suggested behavior of dendronized polymers as molecular objects (i.e., single shape persistent macromolecules). For this purpose, the microscopic structure of dendronized ...
  • Physical principles of membrane remodelling during cell mechanoadaptation 

    Casares, Laura; Elosegui Artola, Alberto; Arroyo Balaguer, Marino; Navajas, Daniel; Roca Cusachs, Pere (2015-06-01)
    Article
    Accés obert
    Biological processes in any physiological environment involve changes in cell shape, which must be accommodated by their physical envelope-the bilayer membrane. However, the fundamental biophysical principles by which the ...
  • Reduction of polysymplectic manifolds 

    Marrero, Juan Carlos; Román Roy, Narciso; Salgado Seco, Modesto; Vilariño, Silvia (2015-02-06)
    Article
    Accés obert
    The aim of this paper is to generalize the classical Marsden-Weinstein reduction procedure for symplectic manifolds to polysymplectic manifolds in order to obtain quotient manifolds which inherit the polysymplectic structure. ...
  • Space-time NURBS-enhanced finite elements for free-surface flows in 2D 

    Stavrev, A.; Knechtges, P.; Elgeti, S.; Huerta, A. (2015-12-08)
    Article
    Accés obert
    The accuracy of numerical simulations of free-surface flows depends strongly on the computation of geometric quantities like normal vectors and curvatures. This geometrical information is additional to the actual degrees ...
  • The Cartridge theory: A description of the functioning of horizontal subsurface flow constructed wetlands for wastewater treatment, based on modelling results 

    Samsó Campà, Roger; García Serrano, Joan (2014-03-01)
    Article
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    Despite the fact that horizontal subsurface flow constructed wetlands have been in operation for several decades now, there is still no clear understanding of some of their most basic internal functioning patterns. To fill ...
  • The scattering map in two coupled piecewise-smooth systems, with numerical application to rocking blocks 

    Granados Corsellas, Albert; Hogan, Stephen John; Martínez-Seara Alonso, M. Teresa (2014-02-15)
    Article
    Accés restringit per política de l'editorial
    We consider a non-autonomous dynamical system formed by coupling two piecewise-smooth systems in R-2 through a non-autonomous periodic perturbation. We study the dynamics around one of the heteroclinic orbits of one of the ...
  • Variable-range electron hopping, conductivity cross-over and space-charge relaxation in C60Br6 

    Manesh, Zachariah; Romanini, Michela; Zygouri, Panagiota; Gournis, Dimitrios; Tamarit Mur, José Luis; Barrio Casado, María del; Macovez, Roberto (2016-07-01)
    Article
    Accés restringit per política de l'editorial
    Dielectric spectroscopy is employed to probe the frequency-dependent conductivity and dipolar dielectric response of solid C60Br6. Below approximately 215 K, charge conduction is electronic and well described by Mott's ...