Now showing items 21-40 of 66

    Testing the initial-final mass relationship of white dwarfs 

    Catalán Ruiz, Sílvia (Date of defense: 2008-03-03)

    White dwarfs are the final remnants of low- and intermediate-mass stars. About 95% of main- sequence stars will end their evolutionary pathways as white dwarfs and, hence, the study of the white dwarf population provides ...

    Individual-based modelling of bacterial cultures in the study of the lag phase 

    Prats Soler, Clara (Date of defense: 2008-06-13)

    La microbiologia predictiva és una de les parts més importants de la microbiologia dels aliments. En el creixement d'un cultiu bacterià es poden observar quatre fases: latència, exponencial, estacionària i mort. La fase ...

    Respuesta extrínseca y comportamiento no lineal en materiales cerámicos piezoeléctricos 

    Ochoa Guerrero, Diego Alejandro (Date of defense: 2009-02-19)

    The study of the elastic, dielectric and piezoelectric non-linear behavior in PZT-based and KNN-based piezoelectric ceramics represent the main goal of this work. Both systems present a perovskite-like structure. Several ...

    Probing the near-field optical response of plasmon nanostructures with two-photon luminescence microscopy 

    Ghenuche, Petru Virgil (Date of defense: 2009-04-02)

    Esta tesis describe el diseño, la fabricación y la caracterización óptica de sistemas plasmónicos resonantes capaces de confinar y aumentar campos de luz en la escala manométrica. En primer lugar, se utilizaron modelos ...

    Rubidium resonant squeezed light from a diode-pumped optical-parametric oscillator 

    Predojevic, Ana (Date of defense: 2009-06-30)

    La luz comprimida (squeezed light) es uno de los componentes importantes de los experimentos de memorias cuánticas. Un almacenamiento eficiente<br/>de la luz comprimida en una colectividad de átomos exige que la luz ...

    Propagació i generació de llum en nanoestructures fotòniques 

    Botey Cumella, Muriel (Date of defense: 2009-07-24)

    Els materials nanoestructats periòdics han ofert, en les dues darreres dècades, un nou marc per a l'estudi de la interacció entre la radiació electromagnètica i la matèria. Aquestes estructures permeten modelar les propietats ...

    Unfolding piecewise-smooth dynamics in a single inductor multiple-output switching converter 

    Moreno Font, Vanessa (Date of defense: 2009-11-09)

    Els convertidors commutats de potència són solucions apropiades per subministrar energia a dispositius electrònics per la seva elevada eficiència i reduït cost. El seu ús extensiu en les últimes dècades ha motivat els ...

    Accretion onto Neutron Stars: Hydrodynamics and Nucleosynthesis 

    Moreno Guzmán, Fermín (Date of defense: 2009-11-25)

    In the middle of the 70s, some authors suggested that accretion of hydrogen and helium rich material by a neutron star in a binary system, where the companion star would have low mass, could explain thermonuclear bursts ...

    Ultracold dipolar gases in optical lattices 

    Trefzger, Christian (Date of defense: 2010-04-19)

    Esta tesis es un trabajo teórico, en el que estudiamos la física de los átomos dipolares bosónicos ultrafríos en retículos ópticos. Éstos gases consisten de átomos o moléculas bosónicas, enfriados bajo la temperatura de ...

    Individual-based modeling of Plasmodium falciparum erythrocyte infection in in vitro cultures 

    Ferrer Savall, Jordi (Date of defense: 2010-06-21)

    La malària és encara avui en dia una malaltia que causa aproximadament un milió de morts a l'any a tot el món. La seva eradicació suposa un gran repte per a la humanitat i per a la comunitat científica, en particular. El ...

    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 ...

    Estudio de modelos de ión polarizables para sales fundidas mediante dinámica molecular 

    Bitrián Varea, Vicente (Date of defense: 2011-07-11)

    La presente tesis es un estudio mediante simulaciones de dinámica molecular de los efectos de la polarización inducida en las propiedades de las sales fundidas, en concreto de los haluros de plata. Estas sales se caracterizan ...

    Bubble and droplet flow phenomena at different gravity levels 

    Suñol Galofré, Francesc (Date of defense: 2011-07-19)

    Two-phase flows are encountered in a wide range of applications both on-ground and in space. The dynamics of such flows in the absence of gravity is completely different from that in normal gravity due to the absence of ...

    Silver nanostructures: chemical synthesis of colloids and composites nanoparticles, plamon resonance properties and silver nanoparticles monolayer films prepared by spin-coating 

    Torres Heredia, Victor Elias (Date of defense: 2011-11-08)

    El presente trabajo tiene como objetivo desarrollar en solución acuosa y a tem-peratura ambiente, rutas de síntesis química coloidal de nanopartículas de plata y nano-partículas compuestas estables. Se obtienen nanopartículas ...

    Stochasticity,complexity and synchronization in semiconductor lasers 

    Tiana Alsina, Jordi (Date of defense: 2011-11-10)

    The purpose of this Thesis is study the dynamical behavior of semiconductor lasers with optical feedback, as well as analyze the synchronization of this kind of systems under different coupling arquitectures. This study ...

    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 ...

    Study on conduction mechanismes of mediun voltage cable XLPE insulation in the melting range of temperatures. 

    Orrit Prat, Jordi (Date of defense: 2012-03-07)

    D’ençà que el polietilè reticulat (XLPE) es va començar a utilitzar com aïllament elèctric per cables de subministrament elèctric, s’han destinat molts esforços a l’estudi de les propietats dielèctriques del polietilè i ...

    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 ...

    Hawking radiation in NS5 and little string theory 

    Lorente Espín, Oscar (Date of defense: 2012-09-20)

    In this thesis we have focused on semi-classical methods that enables us to obtain non-thermal spectra for the vast majority of black holes. This fact is due to taking into account the backreaction of the metric, when the ...

    Thermal convection in rotating spherical shells 

    Garcia Gonzalez, Ferran (Date of defense: 2012-12-01)

    The study of thermal convection in rotating spherical geometry is fundamental to explain many geophysical and astrophysical phenomena such as the generation of the magnetic fields, or the differential rotation observed in ...