Now showing items 1-20 of 28

    • 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 ...
    • 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 ...
    • 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 ...
    • 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 ...
    • Imaging soil-root interaction using X-ray micro-computed tomography 

      Lascurain i Feliu, Tomàs (Universitat Politècnica de Catalunya, 2020-06-01)
      Bachelor thesis
      Open Access
      The interaction between plant roots and soil is extremely relevant and difficult to study as the soil is an opaque and heterogeneous environment. The study of soil physical characteristics as a driver of root development ...
    • In Situ X-Ray Photoelectron Spectroscopy Gas-Solid Carbonation of Ultramafic Rocks: Implications for Carbon Capture and Storage 

      Zhao, Rong (Universitat Politècnica de Catalunya, 2012-07)
      Master thesis
      Open Access
      [ANGLÈS] With the increasing carbon dioxide emission in the atmosphere, there has been an interesting interest in CCS (Carbon Capture and Storage). Mineral carbonation was considered as a better option for storage ...
    • Localized Core Four-Wave Mixing Buildup in the X-ray Spectrum of Chemical Species 

      Serrat Jurado, Carles (2021-01-20)
      Article
      Restricted access - publisher's policy
      Using the Kohn–Sham density functional theory, we numerically study the four-wave mixing response of a carbon atom model system exposed to a train of femtosecond two color ω–3ω random phase coherent X-ray pulses near the ...
    • Material characterization and Monte Carlo simulation of lead and non-lead X-Ray shielding materials 

      Aral, Nebahat; Duch Guillen, María Amor; Ardanuy Raso, Mònica (2020-04-16)
      Article
      Restricted access - publisher's policy
      In this paper, the compositions of commercial lead and non-lead X-ray protective materials were investigated by material analysis methods as FTIR-ATR, SEM/EDS, and density measurement to estimate the content of the structures, ...
    • Metal Analysis in Sandy Sediments from Portable X-Ray Fluorescence 

      Ramirez Pages, Javier (Universitat Politècnica de Catalunya, 2020-06)
      Bachelor thesis
      Open Access
      Covenantee:   Universitat de Barcelona / Consejo Superior de Investigaciones Científicas
      La determinació dels nivells de contaminants en el sol és una pràctica de gran importància pels estudis geològics, ja que ens permeten valorar la qualitat que presenta una determinada zona com a resultat de l'activitat ...
    • Parametric attosecond pulse amplification far from the ionization threshold from high order harmonic generation in He+ 

      Serrat Jurado, Carles; Seres, Jozsef; Seres, Enikoe; Dinh, T. H.; Hasegawa, N.; Nishikino, M.; Namba, S. (2020-07-31)
      Article
      Open Access
      Parametric amplification of attosecond coherent pulses around 100 eV at the single– atom level is demonstrated for the first time by using the 3D time–dependent Schrödinger equation in high–harmonic generation processes ...
    • Piedad de la Cierva Viudes, making her educational and scientific profile visible after her stay in The University Institute For Theoretical Physics (Niels Bohr Institute) Of Copenhagen 

      Zen, Giovanni (2021-03-25)
      Conference report
      Open Access
      Piedad de la Cierva Viudes (1913 - 2007) was an important Spanish chemist in a difficult period for women scientists and, despite her achievements and interesting story, she is still unknown in her native country and abroad. ...
    • Simulations of stellar winds from X-ray bursts: Characterization of solutions and observable variables. 

      Herrera, Yago; Sala Cladellas, Glòria; José Pont, Jordi (EDP Sciences, 2020-06-19)
      Article
      Open Access
      Context. Photospheric radius expansion during X-ray bursts can be used to measure neutron star radii and help constrain the equation of state of neutron star matter. Understanding the stellar wind dynamics is important for ...