Now showing items 11-30 of 68

    Effects of the dipole-dipole interaction on the physics of ultracold quantum gases 

    Abad García, Marta (Date of defense: 2012-02-16)

    In this thesis we study the effects of the dipole-dipole interaction on the physics of ultracold quantum gases, both bosonic and fermionic, within the theoretical framework provided by the mean-field regime. This kind of ...

    Electronics control and signal processing for the LHCb fast calorimeter detectors 

    Picatoste Olloqui, Eduardo (Date of defense: 2016-12-22)

    LHCb is one of the four large experiments of the Large Hadron Collider (LHC) based at CERN. The LHCb experiment is taking data at its nominal design luminosity. However, in order to distinguish among models of new physics, ...

    Entanglement and Quantum Cryphtography 

    Bae, Joonwoo (Date of defense: 2007-04-12)

    Quantum cryptography is one of the most important quantum information applications. The present thesis covers several topics on quantum cryptography, such as the security analysis of quantum channels for key distribution ...

    Entanglement in Many Body Quantum Systems 

    Riera Graells, Arnau (Date of defense: 2010-03-18)

    THESIS SUMMARY<br/><br/>TEXT:<br/><br/>This thesis is made of two parts. In the first one, the issue of entanglement in many body systems is addressed. The concept of entanglement and some of the recent progress on the ...

    Entanglement, quantum phase transitions and quantum algorithms 

    Orús Lacort, Román (Date of defense: 2006-07-20)

    From the seminal ideas of Feynman and until now, quantum information and computation has been a rapidly evolving field. While at the beginning, physicists looked at quantum mechanics as a theoretical framework to describe ...

    Estudi de la influència de l'estat d'ordre atòmic en les transicions martensítiques 

    Castan i Vidal, Maria Teresa (Date of defense: 1987-04-09)

    Els sistemes objecte d'estudi en aquest treball són aliatges metàl·lics d'estructura reticular b.c.c. els quals, a baixes temperatures, experimenten una transició de fase estructural de tipus martensític (bàsicament descrita ...

    Estudi experimental de la dinàmica d'un front fluid en un medi desordenat 

    Planet Latorre, Ramon (Date of defense: 2009-10-23)

    La imbibició és un procés de transport de fluids immiscibles en un medi desordenat en el qual el fluid que mulla preferentment el medi desplaça el fluid resident. La interfície que separa aquests dos fluids esta sotmesa a ...

    Estudio de la dinámica estocástica mediante tiempos de primer paso 

    Ramírez de la Piscina Millán, Laureano (Date of defense: 1990-07-06)

    La caracterización de sistemas por medio de sus tiempos característicos es sujeto de investigación tanto teórica como experimental. Posiblemente el tiempo característico más conocido y más ampliamente utilizado es el Tiempo ...

    Experimentos y modelos en sistemas que presentan transiciones de fase de primer orden con dinámica de avalanchas 

    Pérez Reche, Francisco José (Date of defense: 2005-04-29)

    En esta tesis se han estudiado algunos aspectos de sistemas que presentan transiciones de fase. Para ello se ha empleado tanto un enfoque experimental como teórico. En particular, se han investigado algunas transiciones ...

    Experiments on perturbed Saffman-Taylor flows 

    Ignés i Mullol, Jordi (Date of defense: 1997-06-26)

    We have performed pattern formation experiments where a relatively well understood system (flow in a Hele-Shaw cell) is perturbed either by means of a lattice of grooves or by the use of viscoelastic fluids. We have extended ...

    Explicit Bound states and Resonance fields in Effective Field Theories 

    Tarrús Castellà, Jaume (Date of defense: 2012-06-07)

    The first three chapters of this thesis have been devoted to the theoretical background. We presented the novel work of this thesis in chapters 4 and 5. In chapter 4 we have constructed a Chiral effective field theory for ...

    Facets of non-relativistic Effective Field Theories. 

    Eiras Fernández, Dolors (Date of defense: 2002-07-01)

    Collected papers where problems involving non-relativistic systems are solved by means of a proper Effective Field Theory. Those problems include the calculation of the lifetime of pionium, the lepton finite mass corrections ...

    First measurements of radiative B decays in LHCb 

    Puig Navarro, Albert (Date of defense: 2012-03-09)

    Radiative decays of B mesons, a good example of Flavor Changing Neutral Currents, are interesting for the study of physics beyond the Standard Model, as new high-energy phenomena can enter in the loop. The LHCb experiment, ...

    Flavour Tagging developments within the LHCb experiment 

    Grabalosa Gándara, Marc (Date of defense: 2012-05-15)

    Flavour Tagging at the LHCb experiment is a fundamental tool for the measurement of B oscillations and the study of CP violation. This document explains the development of different tagging techniques and the different ...

    Fluctuations, gene circuit architecture and stem cell quiescence 

    Frigola Tubert, David (Date of defense: 2016-01-18)

    Biological development is a complex process in which, from a single cell, a whole multicellular organism arises. The formation of this intrincate structures requires a very precise regulation in space and time. This ...

    From molecular force generation to large scale cellular movements 

    Campàs i Rigau, Otger (Date of defense: 2006-01-01)

    [eng] The propulsion mechanisms that drive the movements of living cells constitute perhaps the most impressive engineering works of nature. Still, it is simply the interaction between molecules which is responsible for ...

    Front Microrheology of biological Fluids 

    Trejo Soto, Claudia Andrea (Date of defense: 2016-07-15)

    Since Poiseuille times, several techniques has been developed to measure the viscosity of blood. During the 60's and 70's, with the appearance of the first rheomethers, the rheological properties of blood were accurately ...

    Functional organization and networ resilience in self-organizing clustered neuronal cultures 

    Teller Amado, Sara (Date of defense: 2016-02-05)

    Major dynamical traits of a neuronal network are shaped by its underlying circuitry. In several neurological disorders, the deterioration of brain's functionality and cognition has been ascribed to changes in the topological ...

    Imbibition in a model open fracture. Capillary rise, kinetic roughening, and intermittent avalanche dynamics 

    Clotet i Fons, Xavier (Date of defense: 2014-07-11)

    The dynamics of fractured media flows is relevant in many processes of interest that range from the micrometre to the kilometre lengthscales. Flow in disordered media has been proven to be an interesting system to study ...

    Inclusive b-jet production cross section measurement at LHCb 

    Camboni, Alessandro (Date of defense: 2013-02-11)

    The LHCb detector features an outstanding capability to identify displaced secondary vertices with respect to the interaction point. The extraordinary performance of the whole LHCb tracking system makes possible accurate ...