Now showing items 1-20 of 60

    • A comparison of contrast enhancement methods for 2D radiographic images: Applied to patient positioning in proton therapy 

      Nespereira González, Alejandro (Universitat Politècnica de Catalunya, 2015-05-08)
      Master thesis (pre-Bologna period)
      Open Access
      Covenantee:   Université Catholique de Louvain
      Different methods for radiographic image contrast enhancement are studied, implemented and compared. The efficiency of the techniques in improving image contrast is then evaluated both on a subjective evaluation from ...
    • Accretion geometry in the hard state of the black hole X-ray binary MAXI J1820+070 

      Zdziarski, Andrzej A.; Dzielak, Marta A.; Marco, Barbara de (2021-03-01)
      Article
      Restricted access - publisher's policy
      We study X-ray spectra from the outburst rise of the accreting black hole binary MAXI J1820+070. We find that models having the disk inclinations within those of either the binary or the jet imply significant changes of ...
    • Air kerma to H-P(3) conversion coefficients for IEC 61267 RQR X-RAY radiation qualities: application to dose monitoring of the lens of the eye in medical diagnostics 

      Principi, Sara; Guardiola Salmerón, Consuelo; Duch Guillen, María Amor; Ginjaume Egido, Mercè (2016-09-01)
      Article
      Open Access
      Recent studies highlight the fact that the new eye lens dose limit can be exceeded in interventional radiology procedures and that eye lens monitoring could be required for these workers. The recommended operational quantity ...
    • Attosecond state-resolved carrier motion in quantum materials probed by soft x-ray XANES 

      Buades, Bárbara; Picón, Antonio; Berger, Emma; León, Iker; Di Palo, Nicola; Cousin, Seth L.; Cocchi, Caterina; Pellegrin, Eric; Herrero Martin, Javier; Mañas-Valero, Samuel; Coronado, Eugenio; Danz, Thomas; Draxl, Claudia; Uemoto, Mitsuharu; Yabana, Kazuhiro; Schultze, Martin; Wall, Simon; Zürch, Michael; Biegert, Jens (AIP, 2021-03-10)
      Article
      Open Access
      Recent developments in attosecond technology led to table-top x-ray spectroscopy in the soft x-ray range, thus uniting the element- and state-specificity of core-level x-ray absorption spectroscopy with the time resolution ...
    • Attosecond sublevel beating and nonlinear dressing on the 3d-to-5p and 3p-to-5s core-transitions at 91.3 eV and 210.4 eV in krypton 

      Seres, Enikoe; Seres, Jozsef; Namba, Shinichi; Afa, Iduabo John; Serrat Jurado, Carles (2017-12-11)
      Article
      Open Access
      Applying extreme ultraviolet (XUV) transient absorption spectroscopy, the dynamics of the two laser dressed transitions 3d5/2-to-5p3/2 and 3p3/2-to-5s1/2 at photon energies of 91.3 eV and 210.4 eV were examined with ...
    • Automatic localisation and segmentation of the Left Ventricle in Cardiac Ultrasound Images 

      Puyol Anton, Esther (Universitat Politècnica de Catalunya, 2014-09-12)
      Master thesis (pre-Bologna period)
      Open Access
      Covenantee:   École nationale supérieure des télécommunications de Bretagne
      [ANGLÈS] Echocardiography is a common non-invasive diagnostic image modality that uses ultrasound to capture the structure and the function of the heart. During the last years there has been a growing need to automate the ...
    • Caracterización de haces de rayos X de baja energía 

      Casanovas Alegre, Ramon (Universitat Politècnica de Catalunya / Universitat de Barcelona, 2008-07-07)
      Master thesis
      Open Access
      El proyecto desarrollado describe el procedimiento seguido para caracterizar un conjunto de haces de rayos X para la calibración de equipos de medida de la radiación utilizados en el ámbito del radiodiagnóstico médico. La ...
    • Coherent amplification of attosecond light pulses in the water-window spectral region 

      Serrat Jurado, Carles; Roca, David; Seres, Jozsef (2015-02-23)
      Article
      Open Access
      We present a theoretical study on coherent extreme ultraviolet (XUV) attosecond pulse amplification mediated by nonlinear parametric enhanced forward scattering occurring in the interaction of a strong femtosecond infrared ...
    • Coincidence summing corrections for volume samples using the PENELOPE/penEasy Monte Carlo code 

      Vargas Drechsler, Arturo; Camps Brunés, Anna; Serrano Carreño, M. Isabel; Duch Guillen, María Amor (2014-05)
      Article
      Restricted access - publisher's policy
      The coincidence summing correction factors estimated with penEasy, a steering program for the Monte Carlo simulation code PENELOPE, and with penEasy-eXtended, an in-house modified version of penEasy, are presented and ...
    • 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)
      Bachelor thesis
      Open Access
      Covenantee:   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 ...
    • Deep Learning on medical images image captioning on X-rays 

      Schwall, Immanuel Parzival (Universitat Politècnica de Catalunya, 2017-02-28)
      Master thesis
      Restricted access - confidentiality agreement
      Covenantee:   Eidgenössische Technische Hochschule Zürich
    • Dense matter with eXTP 

      Yu, WenFei; Poutanen, Juri; Zhang, Shu; Linares Alegret, Manuel (2019-02-01)
      Article
      Open Access
      In this White Paper we present the potential of the Enhanced X-ray Timing and Polarimetry (eXTP) mission for determining the nature of dense matter; neutron star cores host an extreme density regime which cannot be replicated ...
    • Débruitage et sup er-résolution des images rayons X 

      García Hernando, Guillermo Joaquín (Universitat Politècnica de Catalunya, 2013-05-16)
      Master thesis (pre-Bologna period)
      Restricted access - author's decision
      Covenantee:   École nationale supérieure des télécommunications
      [ANGLÈS] This document contains the Master thesis pursued in the R&D department of Smiths Detection (Vitry-sur-Seine, France) between July 2012 and January 2013 in order to obtain the degrees M.S. in Telecommunications ...
    • Different Accretion Heating of the Neutron Star Crust during Multiple Outbursts in MAXI J0556-332 

      Parikh, Aastha S.; Homan, Jeroen; Wijnands, Rudy; Ootes, Laura; Page, Dany; Altamirano, Diego; Degenaar, Nathalie; Brown, Edward F.; Cackett, Edward; Cumming, Andrew; Deibel, Alex; Fridriksson, Joel K.; Lin, Dacheng; Linares Alegret, Manuel; Miller, Jon M. (2017-12-20)
      Article
      Open Access
      The transient neutron star (NS) low-mass X-ray binary MAXI J0556-332 provides a rare opportunity to study NS crust heating and subsequent cooling for multiple outbursts of the same source. We examine MAXI, Swift, Chandra, ...
    • Diseño de instrumental científico destinado a la caracterización y estructura de nucleo-proteinas y polímeros en general 

      Lloveras Macià, Joaquín (UPC, 1975)
      External research report
      Open Access
      Memòria resum dels treballs d'investigació realitzats a la Cátedra de Tecnología Química Especial de l'ETSIIB de la UPB durant el gaudi d'una beca de formació del personal investigador (1972-1975). Inclou un resum de la ...
    • Electromagnetic radiation of simulated mid-gap streamers 

      Montañá Puig, Juan; Fabró Tàpia, Ferran (Zakon Group, 2016)
      Conference report
      Open Access
      Electromagnetic field from simulated double-headed mid-gap streamers is computed. The effect of the applied electric field is studied by considering electric fields higher than the conventional breakdown threshold ...
    • Electromagnetic shielding effectiveness of polycarbonate/graphene nanocomposite foams processed in 2-steps with supercritical carbon dioxide 

      Gedler, Gabriel; Antunes, Marcelo de Sousa Pais; Velasco Perero, José Ignacio; Ozisik, Rahmi (2015)
      Article
      Open Access
      The electromagnetic interference (EMI) shielding properties of polycarbonate/graphene composites foamed with supercritical carbon dioxide were investigated as a function of cellular morphology and graphene particle dispersion. ...
    • Experimentally well-constrained masses of 27P and 27S: implications for studies of explosive binary systems 

      Sun, Lijie; Xu, Xinxing; Hou, S.Q.; José Pont, Jordi (Elsevier, 2020-03-10)
      Article
      Open Access
      Covenantee:   Zhongguo yuan zi neng ke xue yan jiu yuan / University of Hong Kong / Shanghai jiao tong da xue
      The mass of 27P is expected to impact the X-ray burst (XRB) model predictions of burst light curves and the composition of the burst ashes, but large uncertainties and inconsistencies still exist in the reported 27P masses. ...
    • Extreme-ultraviolet coherent pulse amplification in argon 

      Serrat Jurado, Carles; Seres, Jozsef; Seres, Enikoe; Namba, Shinichi (2019-06-25)
      Article
      Open Access
      The amplification of ultrashort extreme-ultraviolet (XUV) pulses in argon in high-order harmonic generation processes is studied by using the time-dependent Schrödinger equation in the spin-free one-active-electron and ...
    • Generation of intense few-cycle phase-stable electric fields: from the mid-IR to soft X-rays 

      Silva, Francisco José Maia da (Universitat Politècnica de Catalunya, 2016-02-29)
      Doctoral thesis
      Open Access
      Devising new tools that expand our capabilities to sense and manipulate the world enables much of the scientific and technological progress around us. For example, light is increasingly more important as a tool for humanity. ...