Now showing items 1-20 of 21

    • 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 ...
    • 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 ...
    • 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 ...
    • 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 ...
    • 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 / CSIC
      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 ...
    • Study of the relaxation behaviour of severely deformed bulk metallic glasses 

      Girbau, Anna (Universitat Politècnica de Catalunya, 2019-01)
      Bachelor thesis
      Open Access
      Covenantee:   Wilde Group
      Glasses have been used by people for years and represent an important class of materials, which today are an indispensable part of everyday life. In order to produce a metallic glass, the amorphous melt must be cooled down ...
    • Study of the X-ray properties of the neutron star binary 4U 1728-34 from the soft-to-hard state 

      Wang, Yanan; Méndez, Mariano; Altamirano, Diego; Zhang, Guobao; Belloni, Tomaso M.; Martínez Ribeiro, Evandro; Linares Alegret, Manuel; Sanna, Andrea; Motta, Sara Elisa; Tomsick, John A. (Oxford University Press, 2019-01-16)
      Article
      Open Access
      We studied five XMM–Newton observations of the neutron star binary 4U 1728–34 covering the hard, intermediate and soft spectral states. By jointly fitting the spectra with several reflection models, we obtained an inclination ...
    • Technical Note: On the efficiency of variance reduction techniques for Monte Carlo estimates of imaging noise 

      Sharma, Diksha; Sempau Roma, Josep; Badano, Aldo (2018-02)
      Article
      Open Access
      American Association of Physicists in Medicine. Purpose: Monte Carlo simulations require large number of histories to obtain reliable estimates of the quantity of interest and its associated statistical uncertainty. Numerous ...
    • The bright outburst of a new black hole candidate: Optical observations of MAXI J1820+070 from the Montsec observatory 

      Celma Querol, Carlos (Universitat Politècnica de Catalunya, 2019-10)
      Bachelor thesis
      12 months embargo
      Covenantee:   New York University Abu Dhabi
      The motivation of this thesis is to monitor the data of the 2018 outburst of the black hole candidate MAXI J1820+070. This project combines theoretical background about X-ray binaries with the experimental work done in the ...
    • The large observatory for x-ray timing 

      Feroci, Marco; den Herder, J.W.; Bozzo, Enrico; Barret, Didier; Brandt, S.; Hernanz Carbó, Margarita; van der Klis, M; Pohl, M; Santangelo, A; Stella, Luigi; Watts, ana; Willms, Jörn; Sala Cladellas, Glòria (2015)
      Conference report
      Open Access
    • The XMM-Newton/2dF survey - II. The nature of X-ray-faint optically bright X-ray sources 

      Georgakakis, Antonis; Georgantopoulos, Ioannis; Vallbé Mumbrú, Marc; Kolokotronis, Vaggelis; Basilakos, Spyros; Plionis, Manolis; Stewart, Gordon C.; Shanks, Tom; Boyle, Brian J. (Oxford University Press, 2004-03-21)
      Article
      Open Access
      In this paper we investigate the properties of low X-ray-to-optical flux ratio sources detected in a wide area (2.5deg^2) shallow (f(0.5-8keV)~10e-14cgs) XMM-Newton survey. We find a total of 26 sources (5% of the total ...