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  • 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 ...

  • 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 ...

  • Vibration-Based structural health monitoring using piezoelectric transducers and parametric t-SNE 

    Agis Cherta, David; Pozo Montero, Francesc (Multidisciplinary Digital Publishing Institute (MDPI), 2020-03-19)
    Article
    Open Access
    In this paper, we evaluate the performance of the so-called parametric t-distributed stochastic neighbor embedding (P-t-SNE), comparing it to the performance of the t-SNE, the non-parametric version. The methodology used ...

  • A geometric approach to phase response curves and its numerical computation through the parameterization method 

    Pérez Cervera, Alberto; Martínez-Seara Alonso, M. Teresa; Huguet Casades, Gemma (2019-01-01)
    Article
    Open Access
    The phase response curve (PRC) is a tool used in neuroscience that measures the phase shift experienced by an oscillator due to a perturbation applied at different phases of the limit cycle. In this paper, we present a new ...

  • Rainbow factors in hypergraphs 

    Coulson, Matthew John; Keevash, Peter; Perarnau Llobet, Guillem; Yepremyan, Liana (2020-05-01)
    Article
    Open Access
    For any r-graph H, we consider the problem of finding a rainbow H-factor in an r-graph G with large minimum l-degree and an edge-colouring that is suitably bounded. We show that the asymptotic degree threshold is the same ...

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