Now showing items 80-99 of 116

    New geometrical and dynamical techniques for problems in celestial mechanics 

    Braddell, Róisín (Date of defense: 2021-02-17)

    In this thesis, we study the application of symplectic geometry, regular and singular, to symplectic dynamical systems.We start with a motivating case: the relation between symplectic foliations and global transverse ...

    Nodal distributions on the high-dimensional simplex for high-order interpolation and integration 

    Jiménez Ramos, Albert (Date of defense: 2023-06-28)

    (English) To simulate unsteady phenomena on complex moving geometry, computational scientists and engineers have been interested in unstructured space-time discretizations. These space-time discretizations aim to overcome ...

    Non-classical thermal transport and phase change at the nanoscale 

    Calvo Schwarzwälder, Marc (Date of defense: 2019-07-12)

    For 200 years, Fourier’s law has been used to describe heat transfer with excellent results. However, as technology advances, more and more situations arise where heat conduction is not well described by the classical ...

    Normal forms around lower dimensional tori of hamiltonian systems 

    Villanueva Castelltort, Jordi (Date of defense: 1997-03-10)

    L'objectiu bàsic d'aquesta tesi és l'estudi de la dinàmica a l'entorn de tors de dimensió baixa de sistemes hamiltonians analítics. Per aquest estudi l'eina fonamental és l'ús de formes normals al voltant d'aquests ...

    Novel consensus strategies applied to spacecraft formation flight 

    Paita, Fabrizio (Date of defense: 2017-09-04)

    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: ...

    Noves técniques en l'análisi del senyal electrocardiogràfic. Aplicació a l'ECA d'alta revolució 

    Jané Campos, Raimon (Date of defense: 1989-07-10)

    L'estudi del senyal electrocardiogràfic (ECG) obtingut mitjançant elèctrodes de superfície és una prova mèdica freqüent que té una gran significació en el diagnòstic de l'activitat cardíaca. <br/>Des de la incorporació ...

    Numerical study of hopf bifurcations in the two-dimensional plane poiseuille flow 

    Sánchez Casas, José Pablo (Date of defense: 2002-11-28)

    In this work we try to analyse the dynamics of the Navier-Stokes equations in a problem without domain complexities as is the case of the plane Poiseuille flow. The Poiseuille problem is described as the flow of a viscous ...

    NURBS-Enhanced Finite Element Method (NEFEM) 

    Sevilla Cárdenas, Rubén (Date of defense: 2009-07-24)

    Aquesta tesi proposa una millora del clàssic mètode dels elements finits (finite element method, FEM) per a un tractament eficient de dominis amb contorns corbs: el denominat NURBS-enhanced finite element method (NEFEM). ...

    On Normal Forms and Splitting of Separatrices in Reversible Systems 

    Lázaro Ochoa, José Tomás (Date of defense: 2003-10-23)

    És difícil dibuixar una frontera, dins la Teoria de Sistemas Dinàmics, entre lleis de conservació i simetries doncs, sovint, les seves característiques es confonen. Un clar exemple d'aquest fenómen el constitueixen els ...

    On some spectral and combinatorial properties of distance-regular graphs and their generalizations 

    Diego, Víctor (Date of defense: 2017-11-24)

    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 ...

    On the quasiperiodic hamiltonian andronov-hopf bifurcation 

    Pacha Andújar, Juan Ramón (Date of defense: 2002-10-21)

    Aquest treball es situa dintre del marc dels sistemes dinàmics hamiltonians de tres graus de llibertat. Allà considerem famílies d'òrbites periòdiques amb una transició estable-complex inestable: sigui L el paràmetre que ...

    On the role of oscillatory dynamics in neural communication 

    Pérez Cervera, Alberto (Date of defense: 2019-04-04)

    In this Thesis we consider problems concerning brain oscillations generated across the interaction between excitatory (E) and inhibitory (I) cells. We explore how two neuronal groups with underlying oscillatory activity ...

    p-adic L-functions, p-adic Gross-Zagier formulas and plectic points 

    Hernández Barrios, Víctor (Date of defense: 2022-04-19)

    In this work we generalize the construction of p-adic anticyclotomic L-functions associated to an elliptic curve E/F and a quadratic extension K/F, by defining a measure µ_f^p attached to K/F and an automorphic form. In ...

    Parallel Lagrangian particle transport : application to respiratory system airways 

    Olivares Mañas, Edgar (Date of defense: 2018-11-09)

    This thesis is focused on particle transport in the context of high computing performance (HPC) in its widest range, from the numerical modeling to the physics involved, including its parallelization and post-process. The ...

    Paving the path towards automatic hexahedral mesh generation 

    Roca Navarro, Xevi (Date of defense: 2009-07-23)

    Esta tesis versa sobre el desarrollo de las tecnologías para la generación de mallas de hexaedros. El proceso de generar una malla de hexaedros no es automático y su generación requiere varias horas te trabajo de un ingeniero ...

    Probabilistic and extremal studies in additive combinatorics 

    Wötzel, Maximilian (Date of defense: 2022-01-26)

    The results in this thesis concern extremal and probabilistic topics in number theoretic settings. We prove sufficient conditions on when certain types of integer solutions to linear systems of equations in binomial ...

    Probabilitat i causalitat en el manteniment en la marina mercant 

    Verdera i Tomas, Ernest (Date of defense: 1990-01-01)

    Aquest treball vol ser una aportació positiva a la teoria general del Manteniment Industrial. <br/>La teoria del Manteniment Industrial és un camp de la coneixença tècnica que encara ha de ser desbrossat d'influències que ...

    Product of digraphs, (super) edge-magic valences and related problems 

    Mohan, Prahu (Date of defense: 2019-07-03)

    Discrete Mathematics, and in particular Graph Theory, has gained a lot of popularity during the last 7 decades. Among the many branches in Graph Theory, graph labelings has experimented a fast development, in particular ...

    Propagación de ondas monocromáticas en guíaondas dieléctricas planas formadas por medios no lineales tipo Keir: Aplicación al diseño de dispositivos lógicos 

    Dios Otín, Federico (Date of defense: 1992-03-05)

    El trabajo se enmarca dentro del estudio de ciertas propiedades ópticas con vistas a su inclusión en el diseño de dispositivos de conmutación de señales ópticas. En particular se ha prestado atención a los medios que exhiben ...

    Qualitative properties of solutions to integro-differential elliptic problems 

    Felipe Navarro, Juan Carlos (Date of defense: 2021-07-14)

    The thesis is devoted to the analysis of elliptic PDEs and related problems. It is mainly focused on the study of qualitative and regularity properties of solutions to integro-differential equations. The study of such ...