Now showing items 41-60 of 72
Domingo Garau, Albert (Date of defense: 2011-11-24)
El trabajo que presentamos en esta tesis tiene como finalidad la operación, calibración y análisis de datos ópticos del instrumento OMC (Optical Monitoring Camera) a bordo del satélite INTEGRAL (INTErnational Gamma-Ray ...
Zabalza de Torres, Victor (Date of defense: 2011-05-13)
Gamma-ray binaries are systems that comprise a young, massive star and a compact object that can be either a young pulsar or a black hole. They emit radiation from radio up to tens of TeV and show flux variability along ...
Rodríguez Gasén, Rosa (Date of defense: 2011-05-06)
Gradual SEP events is one of the greatest hazards in space environment, particularly for the launch and operation of spacecraft and for manned exploration. Predictions of their occurrence and intensity are essential to ...
Morales Peralta, Juan Carlos (Date of defense: 2010-06-14)
The comparison between stellar structure models and observations of low-mass stars revealed that the stellar radii predicted by models for these stars are about 10% lower than observed, while effective temperatures are ...
Sola Salvatierra, Yolanda (Date of defense: 2009-01-30)
La radiació solar UV que incideix sobre la superfície terrestre depèn de diferent factors astronòmics i meteorològics com l'angle solar zenital, la columna total d'ozó, la nuvolositat i la terbolesa atmosfèrica. Tot això ...
Peracaula i Bosch, Marta (Date of defense: 1997-06-16)
The purpose of this work has been the study of Radio Emitting X-Ray Binaries (REXRBs) both from the observational and theoretical approaches. <br/><br/>We have mainly concentrated in the analysis of their properties inferred ...
Ortega Jiménez, Sara (Date of defense: 2009-07-14)
L'ozó és un contaminant secundari que es pot trobar a la troposfera en quantitats elevades en les èpoques amb major radiació solar. Té efectes nocius sobre els éssers vius i per això és necessari controlar les seves ...
Llasat Botija, Carme (Date of defense: 1987-05-24)
Se han estudiado los factores meteorológicos asociados a seis inundaciones catastróficas acaecidas en Cataluña. Previamente al análisis de tales episodios se ha recopilado toda la información disponible sobre el tema, ...
Antoja Castelltort, M. Teresa (Date of defense: 2010-04-30)
One of the most intriguing features of the stellar velocity distribution in the solar neighbourhood is the existence of moving groups. At present, the origin of these kinematic structures is far from completely understood ...
Solanes Majúa, Josep Maria (Date of defense: 1990-09-28)
El desarrollo de un modelo politrópico y autoconsistente de cúmulo rico de galaxias ha permitido caracterizar las propiedades estructurales y cinemáticas típicas de estos sistemas, así como estudiar detalladamente los ...
Carrasco Martínez, José Manuel (Date of defense: 2006-12-11)
El propósito de esta tesis es el diseño del sistema fotométrico de la misión espacial Gaia (ESA), que debe lanzarse el año 2012. Este conjunto de filtros debe permitir clasificar las observaciones de Gaia, parametrizándolas ...
Vilardell Sallés, Francesc (Date of defense: 2009-03-09)
The Andromeda Galaxy (M31) is an excellent distance calibrator in the Cosmological Distance Ladder. We present the first direct distance determination to M31 using eclipsing binaries (EBs). EBs provides direct distance ...
Cabré Albós, Anna (Date of defense: 2008-06-30)
The cosmic expansion history tests the dynamics of the global evolution of the universe<br/>and its energy density contents, while the cosmic growth history tests the evolution of the<br/>inhomogeneous part of the energy ...
Paredes i Poy, Josep Maria (Date of defense: 1987-01-09)
En aquest treball es presenta l'estudi realitzat, des de l'any 1982, d'un grup d'estrelles que tenen com a característica comuna l'emissió radio. Aquestes estrelles, que anomenarem radioestrelles, i entre les quals no ...
Àgueda Costafreda, Neus (Date of defense: 2008-04-28)
We have developed a Monte Carlo model to simulate the transport of solar near-relativistic (NR; 30-300 keV) electrons along the interplanetary magnetic field (IMF), including adiabatic focusing, pitch-angle dependent ...
Balaguer Núñez, María Dolores (Date of defense: 2006-01-16)
The aim of this thesis, devised as a collaboration between Spain and China, is the characterization of the open clusters NGC 1807, NGC 1817, NGC 2548 and NGC 2682, as well as the analysis of the results in the general ...
Bosch i Ramon, Valentí (Date of defense: 2006-04-27)
Microquasars are X-ray binary systems that present relativistic radio jets.<br/>These systems consist on a normal star and a compact object, where the latter accretes matter from the former powering the mentioned relativistic ...
Fors Aldrich, Octavi (Date of defense: 2006-03-07)
The aim of this thesis is two-fold. First it provides a general methodology for applying image deconvolution to wide-field CCD imagery. Second, two new CCD observational techniques and two data analysis tools are proposed ...
Campmany Pons, Elies (Date of defense: 2005-07-05)
La predicció de l'índex UV consisteix a determinar la irradiància biològicament efectiva que incidirà en un temps posterior a partir del coneixement dels factors que hi intervenen: l'ozó, l'angle zenital, l'altitud del ...
Conangla Triviño, Laura (Date of defense: 2005-07-06)
Aquesta tesi té com a objectiu: contribuir a l'augment de la comprensió i el coneixement de la capa límit estable nocturna, des de l'observació i anàlisi de dades experimentals fins a la simulació unidimensional de processos ...