Ara es mostren els items 1-20 de 21

    • A close look into the variable stars surrounding the first X-ray Transient 

      Gómez Fernández, Laura (Universitat Politècnica de Catalunya, 2023-07-05)
      Treball Final de Grau
      Accés obert
      With the purpose of unveiling the optical counterpart of the first Black Hole Transient (BHT) ever detected, a 12 sq. degree area of the sky was surveyed with the 570-megapixel DECam camera around the estimated position ...
    • Accretion onto Neutron Stars: Hydrodynamics and Nucleosynthesis 

      Moreno Guzmán, Fermín (Universitat Politècnica de Catalunya, 2009-11-25)
      Tesi
      Accés obert
      In the middle of the 70s, some authors suggested that accretion of hydrogen and helium rich material by a neutron star in a binary system, where the companion star would have low mass, could explain thermonuclear bursts ...
    • Constraining the origin of the short timescales X-ray variability of the Seyfert galaxy NGC 7469 

      Núñez Arilla, Carlos (Universitat Politècnica de Catalunya, 2020-06)
      Treball Final de Grau
      Accés obert
      Realitzat a/amb:   Nicolaus Copernicus Astronomical Center
      This bachelor thesis is a small part of a much larger project related to the study of the X-ray properties of the active galactic nucleus (AGN) NGC 7469. In this report I will focus on the analysis of the short-timescales ...
    • Design and construction of a 3D Helmholtz coil system for the ALBA magnetic measurements laboratory 

      Fontanet Valls, Andrea del Carme (Universitat Politècnica de Catalunya, 2019-06)
      Treball Final de Grau
      Accés obert
      Realitzat a/amb:   Sincrotró ALBA
      3D Hall probes designed and produced by ALBA Synchrotron are currently being used at ALBA magnetic measurements laboratory to carry out accurate magnetic characterization of magnets and insertion devices. In order to ...
    • El Ascensor espacial 

      Edwards, Bradley C. (Edicions UPC, 2010)
      Llibre
      Accés restringit als usuaris de la UB, UAB, UPC, UPF, UdG, UdL, URV, UOC, BC, UVic, UJI, URL, UIC
      Cincuenta años después de que el Sputnik sobrevolara la Tierra a menos de 1.000 km de altitud, circunstancia que despertó dosis similares de recelo y admiración, la exploración espacial sigue sustentándose en cohetes que ...
    • El Big Bang i l'Univers primitiu: expansió i abundàncies primordials 

      Farràs Aloy, Sílvia (Universitat Politècnica de Catalunya, 2020-06-22)
      Treball Final de Grau
      Accés obert
      L’objectiu del present treball és l’estudi i caracterització de l’Univers primitiu, mitjançant l’anàlisi d’algunes de les evidències experimentals en què es fonamenta la teoria del Big Bang. El projecte consta de dos blocs ...
    • Hydrodynamic models of accretion onto rotating compact stars 

      Martín Rodríguez, José David (Universitat Politècnica de Catalunya, 2023-07-07)
      Tesi
      Accés obert
      (English) Hydrodynamic models are essential for our understanding of the physics of stellar explosions, and specifically, for their potential contribution to the Galactic chemical abundances. In this Work, a one-dimensional ...
    • Interaction between a nova/supernova ejecta and the nearby mass-accretion disk 

      Arriaza Bosch, Marta (Universitat Politècnica de Catalunya, 2022-06)
      Treball Final de Grau
      Accés obert
      Novae and supernovae are thermonuclear explosions that occur in binary systems, containing a white dwarf. The early stages of these phenomena have been studied extensively, but the interaction of the outburst ejecta, first ...
    • Mission Analysis for Google Lunar X-Prize Participants: Options for going to the Moon 

      Maitre -, Boris (Universitat Politècnica de Catalunya, 2010-07-15)
      Projecte Final de Màster Oficial
      Accés obert
    • Modelling and simulation of plasma heating with ICRF waves in JET tokamak 

      Planas Parra, Eric (Universitat Politècnica de Catalunya, 2020-06)
      Treball Final de Grau
      Accés obert
      One of the challenges that magnetic confinement fusion faces is achieving extreme temperatures inside the reactors. Absorption of electromagnetic waves in the ion cyclotron range of frequencies (ICRF) has demonstrated ...
    • Models for Type I X-Ray Bursts Nucleosynthesis with Parallelisation and Improved Nuclear Physics 

      Martin Rodriguez, Jose-David (Universitat Politècnica de Catalunya, 2012-02-03)
      Projecte Final de Màster Oficial
      Accés obert
      Type I XRBs are thermonuclear flashes on the surface of neutron stars (NS) associated with mass-accretion from a companion star. Models of type I XRBs and their associated nucleosynthesis are physically complicated and ...
    • Models of classical novae with MESA 

      Abril Pla, Oriol (Universitat Politècnica de Catalunya, 2017-06)
      Treball Final de Grau
      Accés obert
      Classical novae are thermonuclear runaways at the envelope of a WD due to the piling up of H-rich accreted material. They have been observed to produce heavy elements during the explosion, and their role in galactical ...
    • Models of stellar winds from X-ray bursts 

      Herrera, Yago (Universitat Politècnica de Catalunya, 2021-12-15)
      Tesi
      Accés obert
      The study of stellar winds (SW) in the context of X-ray bursts (XRB) performed in this thesis has two main motivating issues. The first is whether or not the heavy elements produced from nucleosynthesis in XRBs can escape ...
    • Multi-dimensional simulations of mixing in classical novae 

      Casanova Bustamante, Jordi (Universitat Politècnica de Catalunya, 2011-11-03)
      Tesi
      Accés obert
      Classical nova explosions are stellar explosions that take place in close binary systems with an energy release only exceeded by gamma-ray bursts and supernova explosions. Matter from the white dwarf flows through the inner ...
    • Nonlinear one-zone models of stellar pulsations 

      Munteanu, Andreea (Universitat Politècnica de Catalunya, 2003-12-16)
      Tesi
      Accés obert
      Nuestro trabajo se ha concentrado en la simulación y el análisis de modelos no-lineales aplicados a las curvas de luz ópticas de estrellas variables de largo periodo. Cuando las estrellas de masa pequeña o intermedia (de ...
    • Spectroscopy of nearby white dwarfs & identification of double white dwarfs in common proper motion pairs 

      Perpinyà Vallés, Martí (Universitat Politècnica de Catalunya, 2018-07)
      Treball Final de Grau
      Accés obert
      Realitzat a/amb:   University of Warwick
      On the one hand, this project presents a background in both White Dwarfs and spectroscopy. Some data from Warwick University Astrophysics? Group has been studied and these spectroscopic results are introduced in order to ...
    • Study of the kink instability and twist distribution of heliospheric magnetic flux ropes 

      Florido Llinàs, Marta (Universitat Politècnica de Catalunya, 2020-05-26)
      Treball Final de Grau
      Accés obert
      Realitzat a/amb:   Goddard Space Flight Center
      Les cordes de flux magnètic (MFRs) són estructures fonamentals del plasma en què les línies de camp magnètic es troben retorçades al voltant d’un eix. Apareixen en molts fenòmens de l’heliosfera, incloent un dels principals ...
    • Tests hidrodinàmics amb el codi multidimensional FLASH 

      Casanova i Bustamante, Jordi (Universitat Politècnica de Catalunya, 2007-09-12)
      Projecte Final de Màster Oficial
      Accés obert
      El FLASH és un codi estable i flexible, desenvolupat a la Universitat de Chicago, que permet estudiar diferents fenòmens hidrodinàmics. L'objectiu futur és desenvolupar models multidimensionals centrats en el camp de les ...
    • The study of existence of a new boson in the MeV range: contribution to the data analysis 

      Granollers Colom, Ernest (Universitat Politècnica de Catalunya, 2023-07-07)
      Treball Final de Grau
      Accés restringit per acord de confidencialitat
      Realitzat a/amb:   Grand Accélérateur National d’Ions Lourds
      Contribution to the energy calibration of the silicon detectors of the first experiment of the New JEDI collaboration. The first experiment of New JEDI attemps to redo the experiment done previously that showed the so-called ...
    • Three-dimensional hydrodynamic simulations of dynamos in white dwarfs 

      Marco Rimmek, Joan (Universitat Politècnica de Catalunya, 2018-02-06)
      Treball Final de Grau
      Accés obert
      Realitzat a/amb:   University of Exeter
      The origin of magnetic white dwarfs is still a controversial issue. When white dwarfs cool enough, they crystallize. This causes a phase separation of its main constituents in the nucleus, leaving a less dense liquid behind ...