Now showing items 1-20 of 306

    • Icon

      2D granular flows with the μ(I) rheology and side walls friction: A well-balanced multilayer discretization  [Article]

      Fernández Nieto, Enrique Domingo; Garres Díaz, José; Mangeney, Anne; Narbona Reina, Gladys (Elsevier Inc., 2018-03)
      We present here numerical modelling of granular flows with the rheology in confined channels. The contribution is twofold: (i) a model to approximate the Navier–Stokes equations with the rheology through an asymptotic ...
    • Icon

      3-filiform Leibniz algebras of maximum length  [Article]

      Camacho Santana, Luisa María; Cañete Molero, Elisa María; Gómez Martín, José Ramón; Omirov, Bakhrom Abdazovich (Springer, 2016)
      This work completes the study of the solvable Leibniz algebras, more precisely, it completes the classi cation of the 3- liform Leibniz algebras of maximum length [4]. Moreover, due to the good structure of the algebras ...
    • Icon

      3D well-composed polyhedral complexes  [Article]

      González Díaz, Rocío; Jiménez Rodríguez, María José; Medrano Garfia, Belén (2015)
      A binary three-dimensional (3D) image II is well-composed if the boundary surface of its continuous analog is a 2D manifold. In this paper, we present a method to locally “repair” the cubical complex Q(I)Q(I) (embedded in ...
    • Icon

      A Class of Computationally Fast First Order Finite Volume Solvers: PVM Methods  [Article]

      Castro Díaz, Manuel Jesús; Fernández Nieto, Enrique Domingo (Society for Industrial and Applied Mathematics, 2012)
      In this work, we present a class of fast first order finite volume solvers, named as PVM (Polynomial Viscosity Matrix), for balance laws or, more generally, for nonconservative hyperbolic systems. They are defined in terms ...
    • Icon

      A computational algebraic geometry approach to analyze pseudo-random sequences based on Latin squares  [Article]

      Falcón Ganfornina, Raúl Manuel; Álvarez Solano, Víctor; Gudiel Rodríguez, Félix (Springer, 2019)
      Latin squares are used as scramblers on symmetric-key algorithms that generate pseudo-random sequences of the same length. The robustness and effectiveness of these algorithms are respectively based on the extremely large ...
    • Icon

      A computational algebraic geometry approach to enumerate Malcev magma algebras over finite fields  [Article]

      Falcón Ganfornina, Óscar Jesús; Falcón Ganfornina, Raúl Manuel; Núñez Valdés, Juan (Wiley, 2016)
      The set of Mn(K) of n-dimensional Malcev magma algebras over a finite field can be identified with algebraic sets defined by zero-dimensional radical ideals for which the computation of their reduced Gröbner bases makes ...
    • Icon

      A consistent intermediate wave speed for a well-balanced HLLC solver.  [Article]

      Fernández Nieto, Enrique Domingo; Bresch, Didier; Monnier, J. (Gauthier-Villars, 2008)
      In this work, we present a HLLC scheme modification for application to nonhomogeneous shallow-water equations with pollutant transport. This new version is related to the definition of a consistent approximation of the ...
    • Icon

      A continuous analog for 4-dimensional objects  [Article]

      Pacheco Martínez, Ana María; Mari, Jean-Luc; Real Jurado, Pedro (2013)
      In this paper, we follow up on the studies developed by Kovalevsky (Comput Vis Graph Image Process 46:141–161, 1989) and Kenmochi et al. (Comput Vis Image Underst 71:281–293, 1998), which defined a continuous analog for a ...
    • Icon

      A general approach for the location of transfer points on a network with a trip covering criterion and mixed distances  [Article]

      López de los Mozos Martín, María Cruz; Mesa López-Colmenar, Juan Antonio; Schöbel, Anita (Elsevier, 2017)
      In this paper we consider a trip covering location model in a mixed planar-network space. An embed- ded network in the plane represents an alternative transportation system in which traveling is fasterthan traveling within ...
    • Icon

      A HLLC scheme for nonconservative hyperbolic problems. Application to turbidity currents with sediment transport.  [Article]

      Castro Díaz, Manuel Jesús; Fernández Nieto, Enrique Domingo; Morales de Luna, Tomás; Narbona Reina, Gladys; Parés Madroñal, Carlos (Cambridge University Press, 2013)
      This paper focuses on the generalization of the HLLC Riemann solver for nonconservative problems. First, the general ideas of the extension of the HLLC solvers for nonconservative systems are discussed. Then, two particular ...
    • Icon

      A logic-algebraic tool for reasoning with Knowledge-Based Systems  [Article]

      Alonso Jiménez, José Antonio; Aranda Corral, Gonzalo A.; Borrego Díaz, Joaquín; Fernández Lebrón, María Magdalena; Hidalgo Doblado, María José (Elsevier, 2018)
      A detailed exposition of foundations of a logic-algebraic model for reasoning with knowledge bases speci ed by propositional (Boolean) logic is presented. The model is conceived from the logical translation of usual ...
    • Icon

      A Mixed Heuristic for Generating Cocyclic Hadamard Matrices  [Article]

      Álvarez Solano, Víctor; Armario Sampalo, José Andrés; Falcón Ganfornina, Raúl Manuel; Frau García, María Dolores; Gudiel Rodríguez, Félix; Güemes Alzaga, María Belén; Osuna Lucena, Amparo (Springer, 2018)
      A way of generating cocyclic Hadamard matrices is described, which combines a new heuristic, coming from a novel notion of fitness, and a peculiar local search, defined as a constraint satisfaction problem. Calculations ...
    • Icon

      A multilayer method for the hydrostatic Navier-Stokes equations: a particular weak solution  [Article]

      Fernández Nieto, Enrique Domingo; Koné, E.H.; Chacón Rebollo, Tomás (Ed. Plenum Press, 2014)
      In this work we present a mutilayer approach to the solution of non-stationnary 3D Navier-Stokes equations. We use piecewise smooth weak solutions. We approximate the velocity by a piecewise constant (in z) horizontal ...
    • Icon

      A multilayer shallow model for dry granular ows with the (I)-rheology: application to granular collapse on erodible beds  [Article]

      Fernández Nieto, Enrique Domingo; Garrés Díaz, J.; Mangeney, A.; Narbona Reina, Gladys (Cambridge University Press, 2016)
      In this work we present a multilayer shallow model to approximate the Navier–Stokes equations with the μ(I)μ(I)-rheology through an asymptotic analysis. The main advantages of this approximation are (i) the low cost ...
    • Icon

      A multilayer shallow water system for polydisperse sedimentation  [Article]

      Fernández Nieto, Enrique Domingo; Koné, E.H.; Morales de Luna, Tomás; Bürger, R. (Elsevier, 2013)
      This work considers the flow of a fluid containing one disperse substance consisting of small particles that belong to different species differing in size and density. The flow is modelled by combining a multilayer shallow ...
    • Icon

      A new 2D tessellation for angle problems: The polar diagram  [Article]

      Grima Ruiz, Clara Isabel; Márquez Pérez, Alberto; Ortega Alvarado, Lidia (2006)
      The new approach we propose in this paper is a plane partition with similar features to those of the Voronoi Diagram, but the Euclidean minimum distance criterion is replaced for the minimal angle criterion. The result is ...
    • Icon

      A new bound on the Morse index of constant mean curvature tori of revolution in S3  [Article]

      Cañete Martín, Antonio Jesús (Springer, 2012)
      In this work we give a new lower bound on the Morse index for constant mean curvature tori of revolution immersed in the three-sphere S3, by computing some explicit negative eigenvalues for the corresponding Jacobi operator.
    • Icon

      A new entropy based summary function for topological data analysis  [Article]

      Atienza Martínez, María Nieves; González Díaz, Rocío; Soriano Trigueros, Manuel (Elsevier, 2018)
      Topological data analysis (TDA) aims to obtain useful information from data sets using topological concepts. In particular, it may help to infer from nite sample when a con guration space is a manifold. So far, there ...
    • Icon

      A new Savage-Hutter type model for submarine avalanches and generated tsunami  [Article]

      Fernández Nieto, Enrique Domingo; Bouchut, F.; Bresch, Didier; Castro Díaz, Manuel Jesús; Mangeney, A. (Elsevier, 2008)
      In this paper we present a new two-layer model of Savage-Hutter type to study submarine avalanches. A layer composed of fluidized granular material is assumed to flow within an upper layer composed of an inviscid fluid (e. ...
    • Icon

      A new topological entropy-based approach for measuring similarities among piecewise linear functions  [Article]

      Rucco, Matteo; González Díaz, Rocío; Jiménez Rodríguez, María José; Atienza Martínez, María Nieves; Cristalli, Cristina; Concettoni, Enrico; Ferrante, Andrea; Merelli, Emanuela (Elsevier, 2017)
      In this paper we present a novel methodology based on a topological entropy, the so-called persistent entropy, for addressing the comparison between discrete piecewise linear functions. The comparison is certi ed by the ...