Now showing items 44-63 of 72
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 ...
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 ...
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 ...
Balastegui Manso, Andreu (Date of defense: 2006-04-20)
Los estallidos de rayos gamma (del inglés gamma-ray bursts o GRBs para abreviar) se han clasificado tradicionalmente en GRBs cortos y duros, y GRBs largos y blandos, de acuerdo a la distribución biomodal de sus duraciones. ...
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 ...
Marcote Martin, Benito (Date of defense: 2015-10-27)
High-mass binary systems involve extreme environments that produce non-thermal emission from radio to gamma rays. Only three types of these systems are known to emit persistent gamma-ray emission: colliding-wind binaries, ...
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 ...
Paredes Fortuny, Xavier (Date of defense: 2016-10-17)
Gamma-ray binaries are systems that comprise a compact object orbiting a companion star and display the maximum of the non-thermal Spectral Energy Distribution (SED) in gamma rays. Currently we know five gamma-ray binaries. ...
Abedi, Hoda (Date of defense: 2015-02-27)
We explore the possibility of detecting and characterising the warp of the stellar disc of our Galaxy using synthetic Gaia data and two available proper motion catalogues namely UCAC4 and PPMXL. We develop a new kinematic ...
Ariño i Prats, Andreu (Date of defense: 2015-02-03)
El Medi Intergalàctic permet una caracterització de propietats bàsiques de l'univers tals com paràmetres fonamentals del model cosmològic, el creixement de pertorbacions primordials de densitat i formació de galàxies. ...
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 ...
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 ...
Ortiz Carbonell, Ada Natalia (Date of defense: 2003-10-10)
The aim of this thesis is the study of the total and spectral solar irradiance variability induced by the presence of small magnetic elements that emerge into the solar photosphere. It is important to study changes in the ...
Palau Puigvert, Aina (Date of defense: 2006-07-20)
[spa] En este trabajo se han observado 4 regiones de formación estelar en modo de cúmulo a longitudes de onda milimétricas y submilimétricas con alta resolución angular (2''-4'') y alta sensibilidad. Para llevar a cabo el ...
Sanchis Estruch, María Teresa (Date of defense: 2003-12-01)
This thesis is focused on the implication of de dynamics of clusters on the HI content of galaxies. Target of this study has been the Virgo cluster region.<br/><br/>We have first inferred the three-dimensional galaxy ...
Moldón Vara, Francisco Javier (Date of defense: 2012-07-05)
Gamma-ray binaries are extreme systems that produce non-thermal emission from radio to very-high-energy (above TeV) gamma rays, with the energy output in the spectral energy distribution (SED) dominated by the MeV–GeV ...
Baena Gallé, Roberto (Date of defense: 2013-12-09)
Adaptive optics (AO) systems are used to increase the spatial resolution achieved by ground-based telescopes, which are limited by the atmospheric motion of air layers above them. Therefore, the real cut-off frequency is ...
Mateu i Santaeulària, Mireia (Date of defense: 2016-02-05)
In this work, a subsynoptic characterization of tropopause fold structures is derived from one-year of global, high resolution GFS (Global Forecasting System, 0.3 degrees) data analyses and 10 years of daily WRF (Weather ...
Cubarsi Morera, Rafael (Date of defense: 1988-11-15)
S'estudia la superposició de dos sistemes estel·lars a partir de l'aproximació de Chandrasekhar sota la hipòtesi de simetria cilíndrica, en un cas general no estacionari. Les equacions diferencials de Chandrasekhar es ...
Escudero Tellechea, Miguel (Date of defense: 2006-06-22)
[spa] La presencia de partículas sólidas y/o líquidas en la atmósfera (aerosol atmosférico) tiene diversas implicaciones sobre el clima, la visibilidad, la salud de los humanos y diversos ciclos biogeoquímicos. Debido a ...