Exploració per tema "Classificació AMS::35 Partial differential equations::35R Miscellaneous topics involving partial differential equations"

Ara es mostren els items 1-10 de 10

    • Automatically imposing incremental boundary displacements for valid mesh morphing and curving 

      Ruiz Gironès, Eloi; Gargallo Peiró, Abel; Sarrate Ramos, Josep; Roca, Xevi (2019-07)
      Article
      Accés obert
      We present a new incremental mesh morphing method obtained by proposing and discretizing a solution procedure for the continuous morphing problem. Our method seeks a diffeomorphism that transforms an initial domain to a ...

    • Constraint algorithm for singular field theories in the k-cosymplectic framework 

      Gràcia Sabaté, Francesc Xavier; Rivas Guijarro, Xavier; Román Roy, Narciso (American Institute of Mathematical Sciences, 2020-03-15)
      Article
      Accés obert
      The aim of this paper is to develop a constraint algorithm for singular classical field theories in the framework of k-cosymplectic geometry. Since these field theories are singular, we need to introduce the notion of ...

    • Erratum: constraint algorithm for singular field theories in the $ k $-cosymplectic framework 

      Gràcia Sabaté, Francesc Xavier; Rivas Guijarro, Xavier; Román Roy, Narciso (AMER INST MATHEMATICAL SCIENCES-AIMS, 2021-06)
      Article
      Accés obert

    • Modeling transport phenomena at the interface between a free fluid and a porous medium 

      Costa Ramón, Ana (Universitat Politècnica de Catalunya, 2014-07-19)
      Projecte Final de Màster Oficial
      Accés obert
      In this project, we are dealing with a fluid that flows in a certain domain surrounded by a region formed by a porous medium and a substance dissolved in the fluid. We want to study its velocity, pressure and the concentration ...

    • Modelling mass transfer from a packed bed by fluid extraction 

      Myers, Timothy; Valverde Salamanca, Abel; Aguareles Carrero, María; Calvo Schwarzwälder, Marc; Font Martínez, Francesc (2022-06-01)
      Article
      Accés obert
      A mathematical model describing the erosion or leaching of a solid material by a flowing fluid in a column is developed. This involves an advection-diffusion equation coupled to a linear kinetic reaction describing the ...

    • Multicontact formulation for non-conservative field theories 

      de León Rodríguez, Manuel; Gaset Rifà, Jordi; Muñoz Lecanda, Miguel Carlos; Rivas Guijarro, Xavier; Román Roy, Narciso (Institute of Physics (IOP), 2023-01-13)
      Article
      Accés obert
      A new geometric structure inspired by multisymplectic and contact geometries, which we call multicontact structure, is developed to describe non-conservative classical field theories. Using the differential forms that ...

    • Region-based approximation of probability distributions (for visibility between imprecise points among obstacles) 

      Buchin, Kevin; Kostitsyna, Irina; Löffler, Maarten; Silveira, Rodrigo Ignacio (2019-07)
      Article
      Accés obert
      Let p and q be two imprecise points, given as probability density functions on R2 , and let O be a set of disjoint polygonal obstacles in R2 . We study the problem of approximating the probability that p and q can see each ...

    • Sharp energy estimates for nonlinear fractional diffusion equations 

      Cabré Vilagut, Xavier; Cinti, Eleonora (2014-01)
      Article
      Accés restringit per política de l'editorial
      We study the nonlinear fractional equation (−Δ)su=f(u) in Rn, for all fractions 0<s<1 and all nonlinearities f . For every fractional power s∈(0,1) , we obtain sharp energy estimates for bounded global minimizers and for ...

    • The Bernstein technique for integro-differential equations 

      Cabré Vilagut, Xavier; Dipierro, Serena; Valdinoci, Enrico (Springer Nature, 2022-01-25)
      Article
      Accés obert
      We extend the classical Bernstein technique to the setting of integro-differential operators. As a consequence, we provide first and one-sided second derivative estimates for solutions to fractional equations, including ...

    • The mathematical model of a soap film. Theory of minimal surfaces 

      Calvo Schwarzwälder, Marc (Universitat Politècnica de Catalunya, 2014-07)
      Treball Final de Grau
      Accés obert
      This thesis is an introduction to the theory of minimal surfaces. After introducing the basic concepts of functional analysis, variational calculus and theory of surfaces, a theorem existence of nonparametric minimal ...