Now showing items 25-44 of 66

    Latest generation white dwarf cooling models : theory and applications 

    Renedo Rouco, Isabel (Date of defense: 2014-11-13)

    White dwarfs are the most common stellar evolutionary end-point. Moreover, they can be considered as reliable cosmic clocks to infer the age of a wide variety of stellar populations, including globular and open clusters. ...

    Microscopic description of two dimensional dipolar quantum gases 

    Macía Rey, Adrián (Date of defense: 2015-02-13)

    A microscopic description of the many-body properties of anisotropic homogeneous gases of bosonic dipoles in two dimensions is presented and discussed. By changing the polarization angle with respect to the plane, we study ...

    Microstructural characterization and modelling in primary crystallization 

    Bruna Escuer, Pere (Date of defense: 2007-11-15)

    L'objectiu de la tesi és estudiar la cinètica de les cristal·litzacions primàries en vidres metàl·lics mitjançant simulacions de tipus phase field. Una cristal·lització primària és una transició de fase sòlid-sòlid on la ...

    Modelling the dynamics of large scale shoreline sand waves 

    Van Der Berg, Niels (Date of defense: 2012-05-11)

    Shoreline sand waves are shoreline undulations with a length scale of several kilometres and a time scale of years to decades. They occur on many coasts, migrating in the direction of the dominant littoral drift and they ...

    Monte Carlo simulations of the population of single and binary white dwarfs of our galaxy 

    Camacho Díaz, Judit (Date of defense: 2014-06-19)

    Since white dwarfs are the final stage of the evolution of the vast majority of stars, they carry important information about the chemical evolution of our Galaxy, its star formation rate, and its structure and dynamics. ...

    Monte Carlo study of quantum phase transitions at zero temperature 

    Osychenko, Oleg N. (Date of defense: 2012-12-20)

    The Thesis is devoted to simulations of quantum phase transitions by means of Quantum Monte Carlo techniques. Quantum phase transition is a transition between phases at zero or low enough temperature, where quantum effects ...

    Morphological stability models: Shoreface-connected sand ridges 

    Calvete Manrique, Daniel (Date of defense: 1999-07-29)

    En esta tesis se estudia la formación y mantenimiento de los bancos de arena sobre la plataforma continental asociados a la costa. Estos son estructuras sedimentarias de forma alargada y que se repiten periódicamente a lo ...

    Multiscale techniques in turbulence: application to geophysical fluids and operational oceanography 

    Nieves Calatrava, Verónica U. (Date of defense: 2008-01-25)

    Neuronal oscillations: from single-unit activity to emergent dynamics and back 

    Sancristóbal Alonso, Belén de (Date of defense: 2013-07-22)

    L’objectiu principal d’aquesta tesi és avançar en la comprensió del processament d’informació en xarxes neuronals en presència d’oscil lacions subumbrals. La majoria de neurones propaguen la seva activitat elèctrica a ...

    Nocturnal coastal fronts in the Mediterranean basin 

    Mazón, Jordi (Date of defense: 2015-04-21)

    The main goal of this thesis is to investigate the formation of nocturnal coastal fronts (hereafter CF) in the Mediterranean basin producing nocturnal offshore precipitation near the coastline. After sunset the cooled ...

    Non-linear fluid dynamics in oscillatory cylindrical cavities 

    Panadès i Guinart, Carles (Date of defense: 2013-06-28)

    Even though the transition to turbulence has been studied for over a century, its complete comprehension still remains unclear even for the simplest flows and continues to be a daunting challenge for the scientific community. ...

    Non-local dynamics and intermittency in non-homogeneous flows 

    Ben Mahjoub, Otman (Date of defense: 2000-11-02)

    .<br/><br/>La tesi analitza les dinàmiques no locals i la intermitència en fluids no homogenis i no isotròpics tant en experiments de laboratori com en dades geogràfiques. Després de l'estudi sobre els models que descriuen ...

    Nonlinear frequency conversion under general phase mismatched condition: the role of phase locking and random nonlinear domains 

    Vito, Roppo (Date of defense: 2011-06-15)

    In the field of second harmonic (SH) generation most studies have been concerned with maximizing conversion efficiencies, generally achievable at the phase matching (PM) condition. Outside of the PM the conversion efficiency ...

    Nonlinear Modelling of surf zone morphodynamical instabilities 

    Garnier, Roland (Date of defense: 2003-03-21)

    Esta tesis se dedica en un estudio de estabilidad no lineal de la morfodinàmica de la zona de rompientes de playas de arena. El modelo numérico MORFO55 resuelve las ecuaciones de aguas someras no lineales para la hidrodinámica ...

    Numerical modeling of simple laboratory experiments of rotating flows 

    López Alonso, José Manuel (Date of defense: 2015-02-05)

    Despite the large amount of research which has been conducted on turbulent flows, a full understanding of their dynamics as well as the mechanisms involved in the onset of turbulence is still missing. Experimental studies ...

    On the growth of nearshore sand bars as instability processes of equilibrium beach states 

    Ribas Prats, Francesca (Date of defense: 2004-01-15)

    La zona de rompents de les platges està governada er una gran quantitat de processos complexes altament no lineals i a diverses escales de longitud i de temps. Tot i això, algunes vegades s'hi poden trobar estructures ...

    Path Integral Monte Carlo and Bose-Einstein condensation in quantum fluids and solids 

    Rota, Riccardo (Date of defense: 2011-12-20)

    Several microscopic theories point out that Bose-Einstein condensation (BEC), i.e., a macroscopic occupation of the lowest energy single particle state in many-boson systems, may appear also in quantum fluids and solids ...

    Path integral Monte Carlo. Algorithms and applications to quantum fluids 

    Brualla Barberà, Llorenç (Date of defense: 2002-07-11)

    Path integral Monte Carlo (PIMC) is a method suitable for quantum liquid simulations at finite temperature. We present in this thesis a study of PIMC dealing with the theory and algorithms related to it, and then two ...

    Payload data handling, telemetry and data compression systems for Gaia. 

    Portell i de Mora, Jordi (Date of defense: 2005-09-26)

    Gaia, la nova missió astromètrica de la ESA amb un llançament previst pel 2011, observarà més de mil milions d'estels i altres objectes amb una exactitud sense precedents. Els seus ambiciosos objectius desbanquen completament ...

    Phase-field study of transient stages and fluctuations in solidification 

    Benítez Iglesias, Raúl (Date of defense: 2005-01-27)

    L'estudi de la formació de microstructures en processos de solidificació té importants aplicacions científiques i tecnològiques. L'aparició d'aquestes estructures determina les propietats elèctriques i mecàniques del ...