Now showing items 36-55 of 116

    Discrete operators and distances on subdivision networks 

    Monsó Burgués, Enrique P.J. (Date of defense: 2022-10-20)

    (English) The research we have carried out lies within the domain of diffusion problems for elliptic operators that are defined on discrete structures called networks, that are graphs that are capable of discriminating ...

    Disentangling ecological networks in marine microbes 

    Deutschmann, Ina Maria (Date of defense: 2021-11-29)

    There is a myriad of microorganisms on Earth contributing to global biogeochemical cycles, and their interactions are considered pivotal for ecosystem function. Previous studies have already determined relationships between ...

    Efficient solvers for power flow equations : parametric solutions with accuracy control assessment 

    García-Blanco, Raquel (Date of defense: 2017-02-09)

    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 ...

    Ejection-collision orbits in the restricted three-body problem 

    Rodríguez del Río, Óscar (Date of defense: 2021-07-06)

    The main objective of this dissertation is the study of the ejection-collision (EC) orbits in the circular and planar Restricted Three Body Problem (RTBP from now on). In particular, we will focus on the analytical and ...

    Elliptic problems: regularity of stable solutions and a nonlocal Weierstrass extremal field theory 

    Urtiaga Erneta, Iñigo (Date of defense: 2023-07-04)

    (English) This PhD dissertation deals with qualitative questions from the theory of elliptic Partial Differential Equations (PDE) and integro-differential equations. We are primarily interested in a distinguished class of ...

    Els inicis de l'enginyeria nuclear a Barcelona : la Càtedra Ferran Tallada (1955-1962) 

    Barca i Salom, Francesc Xavier (Date of defense: 2002-07-02)

    Fa 150 anys que es van crear els estudis d'enginyeria industrial a Espanya amb l'objectiu de donar resposta a la creixent industrialització. Tanmateix, de totes les escoles inicialment creades sols l'Escola d'Enginyeria ...

    Equacions de difusió amb condicions de contorn no lineals 

    Consul, Neus (Date of defense: 1997-05-09)

    Els resums d'aquesta tesi s'han introduït en format "PDF"

    Errores en la búsqueda de condiciones robustas. Metodologías para evitarlos. 

    Pozueta Fernández, Maria Lourdes (Date of defense: 2001-12-10)

    El problema de encontrar condiciones robustas al efecto de factores no controlados es un tema que interesa enormemente a las empresas ya que es una característica que demanda el mercado. Existen básicamente dos métodos ...

    Esquemes per a compartir secrets 

    Sáez, Germán (Date of defense: 1998-07-30)

    Aquesta tesi ha estat destacada amb la menció de <br/>PREMI EXTRAORDINARI DE DOCTORAT en l'àmbit de MATEMÀTIQUES<br/>Curs 1997 - 98

    Estimates and rigidity for stable solutions to some nonlinear elliptic problems 

    Miraglio, Pietro (Date of defense: 2020-01-28)

    My thesis deals with the study of elliptic PDE. It is divided into two parts, the first one concerning a nonlinear equation involving the p-Laplacian, and the second one focused on a nonlocal problem. In the first part, ...

    Estudi i disseny de grans xarxes d'interconnexió: modularitat i comunicació 

    Dalfó Simó, Cristina (Date of defense: 2007-12-19)

    Normalment les grans xarxes d'interconnexió o de comunicacions estan dissenyades utilitzant tècniques de la teoria de grafs. Aquest treball presenta algunes contribucions a aquest tema. Concretament, presentem dues noves ...

    Estudio y caracterización de soluciones para juegos cooperativos y bicooperativos 

    Domènech i Blàzquez, Margarita (Date of defense: 2020-11-24)

    The first part of this thesis focuses on cooperative games and specifically on the study of semivalues and probabilistic values. Each semivalue, as a solution concept defined on cooperative games with a finite set of ...

    First order logic of random sparse structures 

    Larrauri Borroto, Lázaro Alberto (Date of defense: 2023-03-03)

    (English) This work is dedicated to the study several models of random structures from the perspective of first-order logic. We prove that the asymptotic probabilities of first-order statements converge in a general model ...

    Flexoelectricity at surface instabilities and stress singularities 

    Mohammadi, Hossein (Date of defense: 2023-06-16)

    (English) The flexoelectric effect, the two-way linear coupling between strain gradient and electric polarization (direct flexoelectricity) or electric field gradient and strain (converse flexoelectricity) universally ...

    Funciones de complejidad y su relación con las familias abstractas de lenguajes 

    Gabarró, Joaquim (Date of defense: 1983-01-01)

    Galoisian approach to supersymmetric quantum mechanics 

    Acosta Humanez, Primitivo Belén (Date of defense: 2009-07-02)

    Esta tesis versa sobre el punto de vista desde la Teoría de Galois Diferencial hacia la mecánica cuántica supersimétrica. El objeto principal considerado aquí es la ecuación deSchrödinger estacionaria no relativista, ...

    Generalized Delaunay triangulations : graph-theoretic properties and algorithms 

    Cano Vila, María del Pilar (Date of defense: 2020-06-25)

    This thesis studies different generalizations of Delaunay triangulations, both from a combinatorial and algorithmic point of view. The Delaunay triangulation of a point set S, denoted DT(S), has vertex set S. An edge uv ...

    Genomics tools in the cloud: the new frontier in omics data analysis 

    Barcelona Cabeza, Rosa (Date of defense: 2021-10-19)

    Substantial technological advancements in next generation sequencing (NGS) have revolutionized the genomic field. Over the last years, the speed and throughput of NGS technologies have increased while their costs have ...

    Geometrical aspects of contact mechanical systems and field theories 

    Rivas Guijarro, Xavier (Date of defense: 2021-12-17)

    Many important theories in modern physics can be stated using the tools of differential geometry. It is well known that symplectic geometry is the natural framework to deal with autonomous Hamiltonian mechanics. This admits ...

    Global Hamiltonian dynamics on singular symplectic manifolds 

    Oms, Cédric (Date of defense: 2020-10-02)

    In this thesis, we study the Reeb and Hamiltonian dynamics on singular symplectic and contact manifolds. Those structures are motivated by singularities coming from classical mechanics and fluid dynamics. We start by ...