Now showing items 1-8 of 8

  • A comparison of high-order time integrators for thermal convection in rotating spherical shells 

    García González, Fernando; Net Marcé, Marta; Garcia-Archilla, Bosco; Sánchez Umbría, Juan (2010-10-01)
    Article
    Open Access
    A numerical study of several time integration methods for solving the threedimensional Boussinesq thermal convection equations in rotating spherical shells is presented. Implicit and semi-implicit time integration ...
  • A technique to composite a modified Newton's method for solving nonlinear equations 

    Grau Sánchez, Miguel; Díaz Barrero, José Luis (2011-05-02)
    External research report
    Open Access
    A zero-finding technique for solving nonlinear equations more efficiently than they usually are with traditional iterative methods in which the order of convergence is improved is presented. The key idea in deriving this ...
  • Convergence and stability assessment of Newton-Kantorovich reconstrutin algorithms for microwve tomography 

    Joachimowicz, N.; Mallorquí Franquet, Jordi Joan; Bolomey, J. C. (Jean-Charles); Broquetas Ibars, Antoni (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1998-08-31)
    Article
    Open Access
    For newly developed iterative Newton-Kantorovitch reconstruction techniques, the quality of the final image depends on both experimental and model noise. Experimental noise is inherent to any experimental acquisition scheme, ...
  • Nonlinear actuation model for lateral electrostatically-actuated DC-contact RF MEMS series switches. 

    Lázaro Guillén, Antoni; Girbau Sala, David; Pradell i Cara, Lluís; Nebot Serra, Àlvar (JOHN WILEY & SONS INC, 2007-06-01)
    Article
    Open Access
    In this work, a nonlinear model to predict actuation characteristics in lateral electrostatically-actuated DC-contact MEMS switches is proposed. In this case a parallel-plate approximation cannot be applied. The model ...
  • On computational order of convergence of some multi-precision solvers of nonlinear systems of equations 

    Grau Sánchez, Miguel; Grau Gotés, Mª Ángela; Díaz Barrero, José Luis (2011-05-02)
    External research report
    Open Access
    In this paper the local order of convergence used in iterative methods to solve nonlinear systems of equations is revisited, where shorter alternative analytic proofs of the order based on developments of multilineal ...
  • Optimized query forgery for private information retrieval 

    Rebollo Monedero, David; Forné Muñoz, Jorge (2010-09)
    Article
    Open Access
    We present a mathematical formulation for the optimization of query forgery for private information retrieval, in the sense that the privacy risk is minimized for a given traffic and processing overhead. The privacy ...
  • The Koch monopole: a small fractal antenna 

    Puente Baliarda, Carles; Romeu Robert, Jordi; Cardama Aznar, Ángel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2000-11)
    Article
    Open Access
    Fractal objects have some unique geometrical properties. One of them is the possibility to enclose in a finite area an infinitely long curve. The resulting curve is highly convoluted being nowhere differentiable. One such ...
  • Un esquema paralelo para el cálculo del pseudoespectro de matrices de gran magnitud 

    Otero Calviño, Beatriz; Astudillo, Reinaldo; Castillo, Zenaida (2015-01-01)
    Article
    Open Access
    The pseudospectra is a powerful tool to study the behavior of dynamic systems associated to non-normalmatrices. Studies and applications have increased in the last decades, thus, its efficient computation hasbecome of ...