Enviaments recents

  • A contribution to consensus modeling in decision-making by means of linguistic assessments 

    Montserrat Adell, Jordi (Universitat Politècnica de Catalunya, 2018-07-20)
    Tesi
    Accés obert
    Decision-making is an active field of research. Specifically, in recent times, a lot of contributions have been presented on decision-making under linguistic assessments. To tackle this kind of processes, hesitant fuzzy ...
  • Global instability in Hamiltonian systems 

    Schaefer, Rodrigo Gonçalves (Universitat Politècnica de Catalunya, 2018-07-11)
    Tesi
    Accés obert
    In Chapters 1 and 2 of this thesis, we prove that for any non-trivial perturbation depending on any two independent harmonics of a pendulum and a rotor there is global instability. The proof is based on the geometrical ...
  • A multisymplectic approach to gravitational theories 

    Gaset Rifà, Jordi (Universitat Politècnica de Catalunya, 2018-07-25)
    Tesi
    Accés obert
    The theories of gravity are one of the most important topics in theoretical physics and mathematical physics nowadays. The classical formulation of gravity uses the Hilbert-Einstein Lagrangian, which is a singular ...
  • A study of cortical network models with realistic connectivity 

    Vegué, Marina (Universitat Politècnica de Catalunya, 2018-03-23)
    Tesi
    Accés obert
    Structure is fundamental in shaping the types of computations that neuronal circuits can perform. Explaining the laws that determine the connectivity properties of brain networks and their implications in neuronal dynamics ...
  • Mathematical modelling of diffusion processes at the nanoscale 

    Ribera Ponsa, Helena (Universitat Politècnica de Catalunya, 2018-03-16)
    Tesi
    Accés obert
    In this thesis we study diffusion processes of nanoparticle evolution and develop appropriate models with the aim of being able to optimise their functions according to the needs of industry. Two distinct diffusion processes ...
  • Hybrid cell-centred/vertex model for multicellular systems 

    Mosaffa, Payman (Universitat Politècnica de Catalunya, 2017-11-11)
    Tesi
    Accés obert
    This thesis presents a hybrid vertex/cell-centred approach to mechanically simulate planar cellular monolayers undergoing cell reorganisation. Cell centres are represented by a triangular nodal network, while the cell ...
  • On some spectral and combinatorial properties of distance-regular graphs and their generalizations 

    Diego, Víctor (Universitat Politècnica de Catalunya, 2017-11-24)
    Tesi
    Accés obert
    In this work we present the study we did in Graph Theory. In the firsts chapteres of the tesis we study the pieces of information that can be obtained from a graph: the spectrum of the adjacency matrix, the preintersection ...
  • Novel consensus strategies applied to spacecraft formation flight 

    Paita, Fabrizio (Universitat Politècnica de Catalunya, 2017-09-04)
    Tesi
    Accés obert
    In this thesis we consider the problem of developing distributed control strategies for spacecraft formation flying. In light of possible interferometric applications, the study is conducted in two different contexts: ...
  • Efficient solvers for power flow equations : parametric solutions with accuracy control assessment 

    García-Blanco, Raquel (Universitat Politècnica de Catalunya, 2017-02-09)
    Tesi
    Accés obert
    The Power Flow model is extensively used to predict the behavior of electric grids and results in solving a nonlinear algebraic system of equations. Modeling the grid is essential for design optimization and control. Both ...
  • A theoretical and computational study of the mechanics of biomembranes at multiple scales 

    Torres-Sánchez, Alejandro (Universitat Politècnica de Catalunya, 2017-07-11)
    Tesi
    Accés obert
    Lipid membranes are thin objects that form the main separation structure in cells. They have remarkable mechanical properties; while behaving as a solid shell against bending, they exhibit in-plane fluidity. These two ...
  • Completion and decomposition of hypergraphs by domination hypergraphs 

    Ruiz Muñoz, José Luis (Universitat Politècnica de Catalunya, 2017-07-18)
    Tesi
    Accés obert
    A graph consists of a finite non-empty set of vertices and a set of unordered pairs of vertices, called edges. A dominating set of a graph is a set of vertices D such that every vertex not in D is adjacent to some vertex ...
  • Extensions of free groups: algebraic, geometric, and algorithmic aspects 

    Delgado Rodríguez, Jordi (Universitat Politècnica de Catalunya, 2017-09-15)
    Tesi
    Accés obert
    In this work we use geometric techniques in order to study certain natural extensions of free groups, and solve several algorithmic problems on them. To this end, we consider the family of free-abelian times free groups ...

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