Now showing items 1-8 of 8

  • A new approach to the vakonomic mechanics 

    Llibre Saló, Jaume; Ramírez Ros, Rafael; Sadovskaia Nurimanova, Natalia Guennadievna (2014-11-01)
    Article
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    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
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    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
    Open Access
    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 ...
  • 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
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    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 ...
  • 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
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    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 ...
  • 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
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    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 ...