Recent Submissions

  • Embeddability of Kimura 3ST Markov matrices 

    Roca Lacostena, Jordi; Fernández Sánchez, Jesús (2018-05-14)
    Article
    Open Access
    In this note, we characterize the embeddability of generic Kimura 3ST Markov matrices in terms of their eigenvalues. As a consequence, we are able to compute the volume of such matrices relative to the volume of all Markov ...
  • Local bisection for conformal refinement of unstructured 4D simplicial meshes 

    Belda Ferrín, Guillem; Gargallo Peiró, Abel; Roca Navarro, Francisco Javier (Springer, 2018)
    Conference report
    Open Access
    We present a conformal bisection procedure for local refinement of 4D unstructured simplicial meshes with bounded minimum shape quality. Specifically, we propose a recursive refine to conformity procedure in two stages, ...
  • Defining a stretching and alignment aware quality measure for linear and curved 2D meshes 

    Aparicio Estrems, Guillermo; Gargallo Peiró, Abel; Roca Navarro, Francisco Javier (Springer, 2018)
    Conference report
    Open Access
    We define a regularized shape distortion (quality) measure for curved high-order 2D elements on a Riemannian plane. To this end, we measure the deviation of a given 2D element, straight-sided or curved, from the stretching ...
  • Universality of Euler flows and flexibility of Reeb embeddings 

    Cardona Aguilar, Robert; Miranda Galcerán, Eva; Peralta-Salas, Daniel; Presas, Francisco (2019-11-05)
    External research report
    Open Access
    The dynamics of an inviscid and incompressible fluid flow on a Riemannian manifold is governed by the Euler equations. Recently, Tao launched a programme to address the global existence problem for the Euler and Navier ...
  • The uncoupling limit of identical Hopf bifurcations with an application to perceptual bistability 

    Pérez Cervera, Alberto; Ashwin, Peter; Huguet Casades, Gemma; Rankin, James; Martínez-Seara Alonso, M. Teresa (2019-12-01)
    Article
    Open Access
    We study the dynamics arising when two identical oscillators are coupled near a Hopfbifurcation where we assume a parameter uncouples the system at = 0. Using anormal form forN= 2 identical systems undergoing Hopf bifurcation, ...
  • Some properties for bisemivalues on bicooperative games 

    Domènech Blázquez, Margarita; Giménez Pradales, José Miguel; Puente del Campo, María Albina (2020-02-29)
    Article
    Restricted access - publisher's policy
    In this work, we focus on bicooperative games, a variation of the classic cooperative games, and investigate the conditions for the coefficients of the bisemivalues—a generalization of semivalues for cooperative games—necessary ...
  • Fixed subgroups and computation of auto-fixed closures in free-abelian times free groups 

    Roy, Mallika; Ventura Capell, Enric (2020-04-01)
    Article
    Open Access
    The classical result by Dyer–Scott about fixed subgroups of finite order automor-phisms of Fnbeing free factors of Fn is no longer true inZm×Fn. Within this more generalcontext, we prove a relaxed version in the spirit of ...
  • Vibration-based detection and classification of structural changes using principal component analysis and t-distributed stochastic neighbor embedding 

    Agis Cherta, David; Tibaduiza Burgos, Diego Alexander; Pozo Montero, Francesc (Wiley, 2020-03-05)
    Article
    Open Access
    This paper describes a structural health monitoring strategy to detect and classify structural changes in structures that can be equipped with sensors. The proposed approach is based on the t-distributed stochastic neighbor ...
  • Sufficient conditions for a digraph to admit a (1,=l)-identifying code 

    Balbuena Martínez, Maria Camino Teófila; Dalfó Simó, Cristina; Martínez Barona, Berenice (2019)
    Article
    Open Access
    A (1, = `)-identifying code in a digraph D is a subset C of vertices of D such that all distinct subsets of vertices of cardinality at most ` have distinct closed in-neighbourhoods within C. In this paper, we give some ...
  • An immersed boundary hierarchical B-spline method for flexoelectricity 

    Codony Gisbert, David; Marco Alacid, Onofre; Fernández Méndez, Sonia; Arias Vicente, Irene (2019-09-01)
    Article
    Restricted access - publisher's policy
    This paper develops a computational framework with unfitted meshes to solve linear piezoelectricity and flexoelectricity electromechanical boundary value problems including strain gradient elasticity at infinitesimal ...
  • Adaptive refinement for phase-field models of brittle fracture based on Nitsche's method 

    Muixí Ballonga, Alba; Fernández Méndez, Sonia; Rodríguez Ferran, Antonio (Springer, 2020-03-18)
    Article
    Restricted access - publisher's policy
    A new adaptive refinement strategy for phase-field models of brittle fracture is proposed. The approach provides a computationally efficient solution to the high demand in spatial resolution of phase-field models. The ...
  • Monomial generators of complete planar ideals 

    Alberich Carramiñana, Maria; Álvarez Montaner, Josep; Blanco Fernández, Guillem (2020-01-01)
    Article
    Restricted access - publisher's policy
    We provide an algorithm that computes a set of generators for any complete ideal in a smooth complex surface. More interestingly, these generators admit a presentation as monomials in a set of maximal contact elements ...

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