Now showing items 25-44 of 64

    La hipótesis adiabática de Paul Ehrenfest: historia de una transformación 

    Pérez Canals, Enric (Date of defense: 2007-04-24)

    La pregunta que ha inspirado que ha venido a dar en este trabajo ha sido: ¿Qué papel tuvo la hipótesis adiabática de Paul Ehrenfest en el desarrollo de la teoría cuántica? Para ello se ha tratado de precisar el significado ...

    Large Scale Excitations in Disordered Systems 

    Sales Pardo, Marta (Date of defense: 2002-11-22)

    Disorder is present in many systems in nature and in many different versions. For instance, the dislocations of a crystal lattice, or the randomness of the interaction between magnetic moments. One of the most studied ...

    L’experiment d’Stern i Gerlach en el seu context teòric: la història d’una reorientació 

    Pié i Valls, Blai (Date of defense: 2015-09-29)

    L'experiment d'Stern-Gerlach (SG) és considerat un dels més importants de la història de la teoria quàntica, i sovint s'utilitza en llibres de text de Mecànica Quàntica per il·lustrar el concepte d'espín ...

    Magnetic deflagration in Mn₁₂-ac and Nd₅Ge₃ : new techniques and phenomena 

    Villuendas Pellicero, Diego (Date of defense: 2016-02-03)

    The goal of this work is to investigate the magnetic deflagration phenomena in two very different magnetic systems, using two very different experimental techniques. In the first chapter of this dissertation I introduce ...

    Magnetization dynamics at the nanoscale in nanoparticles and thin films: single-molecule magnets, magnetic vortices, and magnetic droplet solutions 

    Lendínez Escudero, Sergi (Date of defense: 2016-01-20)

    Research in magnetic materials leads to new devices and technologies. As the technology progresses, the devices become smaller and this miniaturization allows more storage capacity and lower costs in the production of new ...

    Magnetocaloric Effect In Gd5(SixGe1-x)4 Alloys 

    Casanova i Fernàndez, Fèlix (Date of defense: 2004-03-09)

    This Ph.D. Thesis has been devoted to the preparation and characterisation of bulk Gd5(SixGe1-x)4 alloys and to the study of the magnetocaloric effect at the first-order magnetostructural transition appearing in these ...

    Mesoscopic descriptions of complex networks 

    Fernández Sabater, Alberto (Date of defense: 2008-11-13)

    [spa] El objetivo de la presente tesis es el estudio de las subestructuras que aparecen a un nivel de resolución mesoscópico en las redes complejas. Dichas subestructuras, que en el campo de las redes complejas son denominadas ...

    Mesoscopic Nonequilibrium Kinetics of Nucleation Processes 

    Reguera, D. (David) (Date of defense: 2001-11-23)

    Esta tesis está dedicada al estudio de la cinética de la nucleación centrada en sus aspectos mesoscópicos y fuera equilibrio. Hemos desarrollado y presentado un marco teórico, basado en la Termodinámica Mesoscópica y de ...

    Microcanonical cascade formalism for multifractal systems and its application to data inference and forecasting, A 

    Pont i Pla, Oriol (Date of defense: 2009-04-24)

    Complex systems are abundant in our natural environment. In linear systems, the equations of their dynamics can be very difficult to solve, but if they cannot be described with a single characteristic scale, at least they ...

    Microscopic analysis of rotating black holes 

    Maccarrone Heredia, Alessandro (Date of defense: 2016-02-08)

    The main objective of this thesis is to understand from a microscopic point of view some of the characteristic phenomena of rotating black holes. The inclusion of rotation gives rise to physics that allows a more precise ...

    Modelo cuasicristalino de Bahe: propiedades termodinámicas de las disoluciones acuosas de los haluros alcalinos, El 

    Gómez Estévez, Juan Luis (Date of defense: 1983-05-01)

    El estudio de las disoluciones líquidas y en particular de aquellas que contienen electrolitos es uno de los más acuciantes, tanto desde un punto de vista teórico como para el análisis de los procesos biológicos y ...

    Movimiento cuántico de vórtices a bajas temperaturas en superconductores de alta temperatura crítica basados en talio 

    García Santiago, Antoni (Date of defense: 1995-12-18)

    El objeto de estudio de esta tesis es la dinámica intragranular de vórtices a bajas temperaturas en distintas muestras pertenecientes esencialmente a las familias de superconductores de alta temperatura crítica (SCAT) con ...

    Nanomagnetism and high frequency experiments. Basic science and technological applications 

    López Domínguez, Víctor (Date of defense: 2014-06-11)

    The interaction between magnetic nanoparticles and high frequencies, such as microwaves or terahertz waves, is one of the most active field of research, with interesting applications in the screening of electromagnetic ...

    New Applications of the Gauge/Gravity Duality 

    Fernández, Daniel (Fernández Moreno) (Date of defense: 2013-06-14)

    The purpose of this thesis is to put forth and present a series of new applications of the gauge/string duality to areas of high energy physics and condensed matter physics. The contributions showcased in this thesis amount ...

    New mechanisms in the adsorption of colloidal suspensions 

    Pagonabarraga Mora, Ignacio (Date of defense: 1995-06-23)

    In this thesis we have studied the influence of transport mechanisms on the adsorption kinetics of colloidal suspensions, as well as in the distribution of colloidal particles at the adsorbed layer. Adsorption of colloidal ...

    New techniques for the analysis of the large scale structure of the Universe 

    Gil Marín, Héctor (Date of defense: 2012-05-03)

    The goal of this thesis is to study the large scale structure of the Universe from a theoretical point of view. In particular, the different chapters of this thesis focus on developing statistic tools to improve the ...

    Non-binary maximum entropy network ensembles and their application to the study of urban mobility 

    Sagarra Pascual, Oleguer Josep (Date of defense: 2016-07-22)

    Complex networks grow subject to structural constraints which affect their measurable properties. Assessing the effect that such constraints impose on their observables is thus a crucial aspect to be taken into account in ...

    Novel quantum phenomena and excitation modes in type-I superconductors and magnetic vortices 

    Zarzuela Fernández, Ricardo (Date of defense: 2014-11-27)

    The aim of this thesis was to study quantum phenomena and excitation modes in type-I superconductors and magnetic vortices. The intermediate state in type-I superconductors is characterized by the gradual penetration ...

    Noves aplicacions de l'àlgebra geomètrica a la física matemàtica 

    Miralles Esteban, David (Date of defense: 2002-01-24)

    En la presente tesis se han tratado los siguientes aspectos: 1,- Se ha reformulado la presentación de la teoría de espinores consiguiendo una única definición de espinor que da énfasis al observador y matiza el papel ...

    Particle propagation in non-trivial backgrounds: a quantum field theory approach 

    Arteaga Barriel, Daniel (Date of defense: 2007-06-28)

    The basic aim of the thesis is the study of the propagation of particles and quasiparticles in non-trivial backgrounds from the quantum field theory point of view. By "non-trivial background" we mean either a non-vacuum ...