Now showing items 41-60 of 66

    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 ...

    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 ...

    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 ...

    Relaxation dynamics in disordered systems 

    Romanini, Michela (Date of defense: 2015-07-22)

    The nature of the glass transition and of the glassy state is a fundamental and still unsolved problem of condensed matter physics. Many liquids can be supercooled below their melting point without crystallizing, that is, ...

    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 ...

    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 ...

    Short-range order in disordered phases using neutron diffraction 

    Rovira Esteva, Muriel (Date of defense: 2014-09-26)

    Neutron diffraction is a powerful technique that allows to probe the structure of disordered phases across a variety of length scales. However, due to the inherent complexity of these disordered hases, the analysis of the ...

    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 ...

    Simulació per Dinàmica Molecular de Líquids Moleculars Sobrerefredats 

    Palomar Polo, Ricardo (Date of defense: 2007-12-05)

    L'objectiu fonamental d'aquesta tesi és l'estudi mitjançant dinàmica molecular del comportament de líquids sobrerefredats. S'ha escollit líquids amb pont d'hidrogen, concretament els alcohols de baix pes molecular etanol ...

    Simulación cinemática de flujo turbulento.Aplicación al estudio de la estructura de la turbulencia y de la difusión turbulenta. 

    Castilla López, Roberto (Date of defense: 2001-07-24)

    En este trabajo abordan diversos problemas relacionados con los flujos de fluido en régimen turbulento. El principal problema tratado es el de la dispersión de partículas en tiempos intermedios. Se analizan también las ...

    Simulación de Monte Carlo de la población de enanas blancas de la galaxia 

    Torres Gil, Santiago (Date of defense: 2002-07-10)

    El estudio de las propiedades de la población de enanas blancas de la Galaxia es muy amplio, e implica aportaciones en diferentes campos de la astrofísica, tales como evolución estelar, dinámica galáctica, ...

    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 ...

    Structural and electrical characterization of doped graphene and carbon nanotube networks 

    Iqbal, Muhammad Zahir (Date of defense: 2014-07-16)

    Graphene, a two-dimensional sp2-hybridized network of carbon atoms has received a remarkable cornucopia of new physics and served as a unique model system, due particularly to its electronic properties, which could have ...

    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 ...

    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 ...

    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 ...

    Time-varying networks approach to social dynamics : from individual to collective behavior 

    Starnini, Michele (Date of defense: 2014-10-24)

    The data revolution experienced by social science has revealed complex patterns of interactions in human dynamics, such as the heterogeneity and burstiness of social contacts. The recently uncovered temporal dimension of ...