Recent Submissions

  • An ensemble learning solution for predicitive manintenance of wind turbines main bearing 

    Beretta, Mattia; Julian, Anatole Alexandre; Sepúlveda, José; Cusidó Roura, Jordi; Porro Martorell, Olga (Multidisciplinary Digital Publishing Institute (MDPI), 2021-02)
    Article
    Open Access
    A novel and innovative solution addressing wind turbines’ main bearing failure predictions using SCADA data is presented. This methodology enables to cut setup times and has more flexible requirements when compared to the ...
  • Rigidity of cotangent lifts and integrable systems 

    Mir Garcia, Pau; Miranda Galcerán, Eva (2020-05)
    External research report
    Open Access
    In this article we generalize a theorem by Palais on the rigidity ofcompact group actions to cotangent lifts. We use this result to prove rigidity forintegrable systems on symplectic manifolds including sytems with ...
  • Regularisation in ejection-collision orbits of the RTBP 

    Ollé Torner, Mercè; Rodríguez del Río, Óscar; Soler Villanueva, Jaume (2018)
    Conference report
    Open Access
    Numerical explorations confirm well-known analytical results on the ex-istence of ejection-collision orbits in the restricted three-body problem for veryrestrictive values of the Jacobi constantC. For different values ...
  • b-Structures on Lie groups and Poisson reduction 

    Dempsey Bradell, Roisin Mary; Kiesenhofer, Anna; Miranda Galcerán, Eva (2020-09)
    External research report
    Open Access
    We introduce the notion of b-Lie group as a pair(G, H) where Gis a Lie group and H is a codimension-one Lie subgroup, and study the associated canonical b-symplectic structure on the b-cotangent bundle bT*G together with ...
  • Integrable systems on singular symplectic manifolds: from local to global 

    Cardona Aguilar, Robert; Miranda Galcerán, Eva (2020-09)
    External research report
    Open Access
    In this article we consider integrable systems on manifolds endowed with singular sym-plectic structures of order one. By singular symplectic structures of order one we mean structureswhich are symplectic away from an ...
  • A rainbow Dirac's theorem 

    Coulson, Matthew John; Perarnau Llobet, Guillem (2020-01-01)
    Article
    Open Access
    A famous theorem of Dirac states that any graph on n vertices with minimum degree at least n/2 has a Hamilton cycle. Such graphs are called Dirac graphs. Strengthening this result, we show the existence of rainbow Hamilton ...
  • New contributions to the Hamiltonian and Lagrangian contact formalisms for dissipative mechanical systems and their symmetries 

    Gaset Rifà, Jordi; Gràcia Sabaté, Francesc Xavier; Muñoz Lecanda, Miguel Carlos; Rivas Guijarro, Xavier; Román Roy, Narciso (2020-06-01)
    Article
    Restricted access - publisher's policy
    We provide new insights into the contact Hamiltonian and Lagrangian formulations of dissipative mechanical systems. In particular, we state a new form of the contact dynamical equations, and we review two recently presented ...
  • A canonical realization of the Weyl BMS symmetry 

    Batlle Arnau, Carles; Campello Román, Víctor Manuel; Gomis Torné, Joaquim (Elsevier, 2020-12-10)
    Article
    Open Access
  • Group inverse matrix of the normalized Laplacian on subdivision networks 

    Carmona Mejías, Ángeles; Mitjana Riera, Margarida; Monsó Burgués, Enrique P.J. (2020)
    Article
    Open Access
    In this paper we consider a subdivision of a given network and we show how the group inverse matrix of the normalized laplacian of the subdivision network is related to the group inverse matrix of the normalized laplacian ...
  • Embeddability and rate identifiability of Kimura 2-parameter matrices 

    Casanellas Rius, Marta; Fernández Sánchez, Jesús; Roca Lacostena, Jordi (2020-03-01)
    Article
    Open Access
    Deciding whether a substitution matrix is embeddable (i.e. the corresponding Markov process has a continuous-time realization) is an open problem even for 4×4 matrices. We study the embedding problem and rate identifiability ...
  • Damage diagnosis for offshore wind turbine foundations based on the fractal dimension 

    Hoxha, Ervin; Vidal Seguí, Yolanda; Pozo Montero, Francesc (2020-10-05)
    Article
    Open Access
    Cost-competitiveness of offshore wind depends heavily in its capacity to switch preventive maintenance to condition-based maintenance. That is, to monitor the actual condition of the wind turbine (WT) to decide when and ...
  • Rigidity of cotangent lifts and integrable systems 

    Mir Garcia, Pau; Miranda Galcerán, Eva (2020-11)
    Article
    Open Access
    In this article we generalize a theorem by Palais on the rigidity of compact group actions to cotangent lifts. We use this result to prove rigidity for integrable systems on symplectic manifolds including systems with ...

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