Exploració per tema "Astrofísica"

Ara es mostren els items 41-60 de 224

    • Commissioning of the BRIKEN beta-delayed neutron detector for the study of exotic neutron-rich nuclei 

      Tolosa-Delgado, Alvaro; Agramunt Ros, Jorge; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Tarifeño Saldivia, Ariel Esteban (EDP Sciences, 2018)
      Comunicació de congrés
      Accés obert
      Beta-delayed neutron emission (Beta-n) is a form of radioactive decay in which an electron, an anti-neutrino and one or more neutrons are emitted. This process arises if the energy window of the decay Q_Beta is greater ...

    • Comparative testing of four ionospheric models driven with GPS measurements 

      Zandbergen, R.; Feltens, Joachim; Angling, M; Jackson Booth, N; Jakowski, Norbert; Hoque, Mainul; Hernández Pajares, Manuel; Aragón Ángel, María Ángeles; Orús Pérez, Raül (2011-07-28)
      Article
      Accés obert
      In the context of the European Space Agency/European Space Operations Centre funded Study “GNSS Contribution to Next Generation Global Ionospheric Monitoring,” four ionospheric models based on GNSS data (the Electron ...

    • Connecting the Grad-shafranov reconstruction technique to flux-rope models 

      Jumilla Lorenz, Jordi (Universitat Politècnica de Catalunya, 2021-05)
      Treball Final de Grau
      Accés obert
      Realitzat a/amb:   Goddard Space Flight Center
      La tècnica de reconstrucció de Grad-Shafranov (GSRT) és una metodologia ben establerta basada en una equació fonamental de la magnetohidrodinàmica (MHD). Aquest mètode ha estat àmpliament aplicat en l’anàlisi de cordes de ...

    • Constraining the contribution of Gamma-Ray Bursts to the high-energy diffuse neutrino flux with 10 years of ANTARES data 

      Alves Garre, Sergio; André, Michel; Anghinolfi, Marco; Anton, Gisela; Ardid Ramírez, Miguel; Aublin, J.; Belhorma, Bouchra; Bendahman, Meriem; Bertin, Vincent; Bissinger, Matthias; Boumaaza, Jihad (arXiv, 2021)
      Text en actes de congrés
      Accés obert
      Addressing the origin of the observed diffuse astrophysical neutrino flux is one of the main challenges in the context of the neutrino astronomy nowadays. Among several astrophysical sources, Gamma-Ray Bursts (GRBs) are ...

    • Constraining the contribution of gamma-ray bursts to the high-energy diffuse neutrino flux with 10 yr of ANTARES data 

      Albert, A.; André, Michel; Anghinolfi, Marco; Anton, Gisela; Ardid Ramírez, Miguel; Aubert, J.-J.; Aublin, J.; Baret, Bruny; Basa, S. (Oxford University Press, 2021-02-01)
      Article
      Accés obert
      Addressing the origin of the astrophysical neutrino flux observed by IceCube is of paramount importance. Gamma-Ray Bursts (GRBs) are among the few astrophysical sources capable of achieving the required energy to contribute ...

    • 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 ...

    • Constraints on the neutrino emission from the Galactic Ridge with the ANTARES telescope 

      Anghinolfi, Marco; Anton, G.; André, Michel; Avgitas, T.; Bertin, V.; Bormuth, R.; Puricelli, Stefano; Coniglione, R.; Gleixner, A; Lefèvre, Dominique; Michael, Turner; Pellegrino, Carlo; Piattelli, P.; Sanchez Losa, Agustín; Schnabel, J. (Elsevier, 2016-09-10)
      Article
      Accés obert
      A highly significant excess of high-energy astrophysical neutrinos has been reported by the IceCube Collaboration. Some features of the energy and declination distributions of IceCube events hint at a North/South asymmetry ...

    • Control system of the balloon experimental twin telescope for infrared interferometry 

      Casalprim Torres, Marc (Universitat Politècnica de Catalunya, 2017-09)
      Projecte Final de Màster Oficial
      Accés obert
      Realitzat a/amb:   Institut Supérieur de l'Aéronautique et de l'Espace / Goddard Space Flight Center
      The Balloon Experimental Twin Telescope for Infrared Interferometry (BETTII) is a far infrared telescope on a balloon-based platform that will validate the interferometry technique for future space telescopes. It is one ...

    • Data gathering and methodology 

      Sanz Subirana, Jaume; Juan Zornoza, José Miguel (2018-10-31)
      Report de recerca
      Accés obert
      The aim of this WP5 is to specify the impact of TID in EGNOS, N-RTK and HF systems through statistical correlation of the performance data recorded from system operators and of TID detection results. The analysis will be ...

    • Deep model simulation of polar vortices in gas giant atmospheres 

      García González, Fernando; Chambers, Frank; Watts, Anna (Oxford University Press, 2020-11-04)
      Article
      Accés obert
      The Cassini and Juno probes have revealed large coherent cyclonic vortices in the polar regions of Saturn and Jupiter, a dramatic contrast from the east–west banded jet structure seen at lower latitudes. Debate has centred ...

    • Deep-sea deployment of the KM3NeT neutrino telescope detection units by self-unrolling 

      Aiello, S; Albert, Andreas; Alves Garre, Sergio; Ameli, F; Anassontzis, E.G.; André, Michel; Androulakis, Giorgos; Anghinolfi, Marco; Anguita, M.; Anton, Gisela; Ardid Ramírez, Miguel; Aublin, J.; Bagatelas, Christos (2020-11-19)
      Article
      Accés obert
      KM3NeT is a research infrastructure being installed in the deep Mediterranean Sea. It will house a neutrino telescope comprising hundreds of networked moorings—detection units or strings—equipped with optical instrumentation ...

    • Demonstrating cosmological and Doppler redshift in the classroom 

      Marshall, Oriel; Tojeiro, Rita; Weijmans, Anne-Marie (Universitat Politècnica de Catalunya, 2022-04-29)
      Comunicació de congrés
      Accés obert
      Cosmology is often a difficult subject to teach as it can involve many confusing and sometimes abstract concepts. One particular topic with many existing misconceptions and difficulties surrounding it is redshift, specifically ...

    • Determining the neutrino mass ordering and oscillation parameters with KM3NeT/ORCA 

      Aiello, S; Albert, Arthur; Alves Garre, Sergio; André, Michel (springer-Verlag, 2022-01-01)
      Article
      Accés obert
      The next generation of water Cherenkov neutrino telescopes in the Mediterranean Sea are under construction offshore France (KM3NeT/ORCA) and Sicily (KM3NeT/ARCA). The KM3NeT/ORCA detector features an energy detection ...

    • Development of modular adaptive transition edge sensor SQUID electronics (MATESSE) 

      Risco Patiño, Albert (Universitat Politècnica de Catalunya, 2022-10-31)
      Projecte Final de Màster Oficial
      Accés restringit per acord de confidencialitat
      We live in a era where science increasingly requires to push the limits of human technology, and space exploration is of course not an exemption. Many objects in the universe are simply not observable in the optical band, ...

    • Discovery of Cl-34g,Cl-m(p,gamma)Ar-35 resonances activated at classical nova temperatures 

      Fry, C.; Wrede, Christopher; Bishop, Shawn M.; Brown, B. A.; Chen, Alan A.; Faestermann, Thomas; Hertenberger, R.; Parikh, Anuj Ramesh; Perez Loureiro, D; Wirth, Hans Friedrich; Garcia, A.; Ortez, Ronaldo (2015-01-13)
      Article
      Accés obert
      Background: The thermonuclear Cl-34g,Cl-m(p,gamma)Ar-35 reaction rates are unknown due to a lack of experimental nuclear physics data. Uncertainties in these rates translate to uncertainties in S-34 production in models ...

    • Distorsiones de espacio-tiempo y los viajes interestelares 

      Martín Cabezón, Rubén (2009-10-20)
      Audiovisual
      Accés obert
      Desde que a principios del siglo XX la Relatividad General hiciera su aparición, nuestra comprensión de la gravedad, una de las fuerzas más primordiales (y poco comprendida), ha aumentado considerablemente. Esta teoría ...

    • Does the disk in the hard state of XTE J1752-223 extend to the innermost stable circular orbit? 

      Zdziarski, Andrzej A.; Marco, Barbara de (Institute of Physics (IOP), 2021-01-11)
      Article
      Accés obert
      The accreting black hole binary XTE J1752–223 was observed in a stable hard state for 25 days by the Rossi X-ray Timing Explorer (RXTE), yielding a 3–140 keV spectrum of unprecedented statistical quality. Its published ...

    • Draw me a neutrino: the first KM3NeT art contest 

      Ageron, M.; Aiello, S; Alshamsi, Mohammed; Ambrosone, Antonio; André, Michel; Androulakis, Giorgos; Anghinolfi, Marco; Anton, Gisela; Ardid Ramírez, Miguel; Aublin, J.; Bagatelas, Christos (arXiv, 2021)
      Text en actes de congrés
      Accés obert
      While the KM3NeT neutrino detector is being deployed in the Mediterranean Sea, the Collaboration launched a contest searching for illustrations of the neutrinos it will detect. The participants in the contest were invited ...

    • Dynamical behavior of asteroids near resonance: the 4:1 gap and the 7:2 group 

      Grau Sánchez, Miguel; González Casado, Guillermo (1999-08)
      Article
      Accés restringit per política de l'editorial
      A comparative study of the evolution of the Sun–Jupiter–Asteroid system near the 4:1 and 7:2 resonances is performed by means of two techniques that proceed differently from the Hamiltonian corresponding to the planar ...

    • Eccentricity samples: implications on the potential and the velocity distribution 

      Cubarsí Morera, Rafael; Stojanovic, Milan; Ninkovic, Slobodan (2017)
      Article
      Accés obert
      Planar and vertical epicycle frequencies and local angular velocity are related to the derivatives up to the second order of the local potential and can be used to test the shape of the potential from stellar disc samples. ...