Now showing items 21-40 of 108

  • Comparison between nonlinear measurements in patterned and unpatterned thin films 

    Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; O'Callaghan Castellà, Juan Manuel (IOP PUBLISHING LTD, 2004-07-31)
    Article
    Open Access
    This work compares two alternative methods of characterizing the nonlinearities in a 10 × 10 mm2 superconducting thin film. Both methods are based on measuring the intermodulation distortion in high temperature superconducting ...
  • Comparison of lossy filters and predistorted filters using novel software 

    Padilla Díaz, Alberto; Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; Ernst, Cristoph; Rius Casals, Juan Manuel; Tamayo Palau, José María; O'Callaghan Castellà, Juan Manuel (IEEE Microwave Theory and Techniques Society, 2010)
    Conference lecture
    Open Access
  • Comprehensive circuit model of autolimiting superconductor devices 

    Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; Hueltes Escobar, Alberto; O'Callaghan Castellà, Juan Manuel; García Pastor, David; Perea Robles, Rafael; Joshi, N.; Lu, X.; Orloff, Nathan D.; Booth, James C. (2017-06-01)
    Article
    Open Access
    This paper presents a phenomenological equivalent circuit to model the phenomenon occurring when a section of superconducting transmission line transits from a superconducting state to a normal state. This phenomenon allows ...
  • Comprehensive circuit model of auto-limiting superconductor devices and systems 

    Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; Hueltes Escobar, Alberto; O'Callaghan Castellà, Juan Manuel; García Pastor, David; Perea Robles, Rafael; Joshi, N.; Lu, X.; Orloff, Nathan D.; Booth, James C. (Institute of Electrical and Electronics Engineers (IEEE), 2016)
    Conference lecture
    Restricted access - publisher's policy
    This paper presents a phenomenological equivalent circuit to model the phenomenon occurring when a section of superconducting transmission line transits from a superconducting state to a normal state. This phenomenon allows ...
  • Correction to "Nonlinear Analysis of Disk Resonators: Application to Material Characterization and Filter Design 

    Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; O'Callaghan Castellà, Juan Manuel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2001-12-31)
    Article
    Open Access
    A procedure for the numerical prediction of the microwave nonlinear behavior (intermodulation products, degradation of quality factors, etc.) of TM010 disk resonators has been developed. The procedure is based on relating ...
  • Design and fabrication of coplanar YBCO structures on lithium niobate substrates 

    Rozan, Edouard; Collado Gómez, Juan Carlos; Garcia, Alfredo; O'Callaghan Castellà, Juan Manuel; Pous Andrés, Rafael; Fàbrega Sanchez, Lourdes; Rius Casals, Juan Manuel; Rubí, R; Fontcuberta, J; Harackiewicz, F (1999-06)
    Article
    Open Access
    YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// (YBCO) with low RF losses has been successfully deposited onto lithium niobate (LNO) to improve the performance of electrooptic Mach-Zender modulators. Epitaxial, c-axis oriented ...
  • Design and fabrication of coplanar YBCO structures on lithium niobate substrates 

    Rozan, Edouard; Collado Gómez, Juan Carlos; García, A.; O'Callaghan Castellà, Juan Manuel; Pous Andrés, Rafael; Fàbrega i Soler, Lluís; Rius Casals, Juan Manuel; Rubí, R.; Fontcuberta, Josep; Harackiewicz, F. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1999-06-30)
    Article
    Open Access
    YBa2Cu3O7-δ (YBCO) with low RF losses has been successfully deposited onto lithium niobate (LNO) to improve the performance of electrooptic Mach-Zender modulators. Epitaxial, c-axis oriented superconducting YBCO thin films ...
  • Detuning and saturation of superconducting devices: formulation and measurements 

    Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; Booth, James C.; O'Callaghan Castellà, Juan Manuel (Institute of Electrical and Electronics Engineers, 2007-06)
    Conference report
    Open Access
    Saturation and detuning of high temperature superconducting (HTS) resonators and filters may occur due to the inherent nonlinear properties of the superconductor. In HTS transmission lines, these nonlinear properties ...
  • Dielectric properties of colon polyps, cancer, and normal mucosa: Ex vivo measurements from 0.5 to 20 GHz 

    Guardiola, Marta; Buitrago Ventura, Santiago; Fernández-Esparrach, Glòria; O'Callaghan Castellà, Juan Manuel; Romeu Robert, Jordi; Cuatrecasas, Miriam; Córdoba, Henry; González Ballester, Miguel A.; Camara, Oscar (2018-06-15)
    Article
    Open Access
    Colorectal cancer is highly preventable by detecting and removing polyps, which are the precursors. 20 Currently, the most accurate test is colonoscopy, but still misses 22% of polyps due to visualization limitations. In ...
  • Direct extraction of all four transistor noise parameters from 50 noise figure measurements 

    Lázaro Guillén, Antoni; Pradell i Cara, Lluís; Beltrán, A.; O'Callaghan Castellà, Juan Manuel (IEE, 1998-02-05)
    Article
    Open Access
    A new method for measuring the four noise parameters (NPs) of a transistor is presented. It is based on the determination of its intrinsic noise matrix elements (C11INT, C22INT, Re(C12INT), Im(C12INT)) by fitting the ...
  • Direct extraction of all four transistor noise parameters from 50 noise figure measurements 

    Lázaro Guillén, Antoni; Pradell i Cara, Lluís; Beltrán, A; O'Callaghan Castellà, Juan Manuel (Institution of Electrical Engineers, 1998-02)
    Article
    Open Access
    A new method for measuring the four noise parameters (NPs) of a transistor is presented. It is based on the determination of its intrinsic noise matrix elements (C, ,INT, C,,7NT, Re(C,,
  • Direct identification of extended defects as vortex pinning centers in melt textured YBa2Cu3O7-Y2BaCuO5 composites 

    Puig, T.; Obradors i Berenguer, Francesc Xavier; Martínez, B.; Sandiumenge, F.; O'Callaghan Castellà, Juan Manuel; Rabier, J. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1999-06-30)
    Article
    Open Access
    Single domain YBa2Cu3O7-Y2BaCuO5 melt textured ceramic composites have revealed a very rich microstructure, which has usually impeded, by using standard measurements, to evaluate the contribution of each defect to the ...
  • Direct identification of extended defects as vortex pinning centers in melt textured YBa/sub 2/Cu/sub 3/O/sub 7/-Y/sub 2/BaCuO/sub 5/ composites 

    Puig Molina, Teresa; Obradors i Berenguer, Francesc Xavier; Martinez, B; Sandiumenge, F; O'Callaghan Castellà, Juan Manuel; Rabier, J (1999-06)
    Article
    Open Access
    Single domain YBa/sub 2/Cu/sub 3/O/sub 7/-Y/sub 2/BaCuO/sub 5/ melt textured ceramic composites have revealed a very rich microstructure, which has usually impeded, by using standard measurements, to evaluate the contribution ...
  • Examen Final 

    Aguasca Solé, Alberto; Corbella Sanahuja, Ignasi; Duffo Ubeda, Núria; Mateu, J.; O'Callaghan Castellà, Juan Manuel; Pradell i Cara, Lluís; Torres Torres, Francisco (Universitat Politècnica de Catalunya, 2014-01-10)
    Exam
    Restricted access to the UPC academic community
  • Examen Final 

    Aguasca Solé, Alberto; Corbella Sanahuja, Ignasi; Duffo Ubeda, Núria; Mateu, J.; O'Callaghan Castellà, Juan Manuel; Pradell i Cara, Lluís (Universitat Politècnica de Catalunya, 2015-03-23)
    Exam
    Restricted access to the UPC academic community
  • Experiments and model of intermodulation distortion in a rutile resonator with YBCO endplates 

    Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; Menéndez Nadal, Óscar; O'Callaghan Castellà, Juan Manuel (KLUWER ACADEMIC/PLENUM PUBL, 2003-10-31)
    Article
    Open Access
    We have derived general equations to calculate intermodulation distortion in resonators with high temperature superconducting (HTS) films which are not restricted to a specific resonator shape and may be used whenever the ...
  • Ex vivo assessment and in vivo validation of non-invasive stent monitoring techniques based on microwave spectrometry 

    Gálvez Montón, Carolina; Arauz Garofalo, Gianluca; Rodríguez Leor, Oriol; Soler Botija, Carolina; Amorós García de Valdecasas, Susana; Bayés Genis, Antoni; O'Callaghan Castellà, Juan Manuel; Macià Bros, Ferran; Tejada Palacios, Javier (Nature, 2018-10-04)
    Article
    Open Access
    Some conditions are well known to be directly associated with stent failure, including in-stent re-occlusion and stent fracture. Currently, identification of these high-risk conditions requires invasive and complex procedures. ...
  • FCC-ee: the Lepton Collider: future circular collider conceptual design report volume 2 

    O'Callaghan Castellà, Juan Manuel (Springer, 2019-06-01)
    Article
    Open Access
    In response to the 2013 Update of the European Strategy for Particle Physics, the Future Circular Collider (FCC) study was launched, as an international collaboration hosted by CERN. This study covers a highest-luminosity ...
  • FCC-hh: the hadron collider: future circular collider conceptual design report volume 3 

    Abada, A.; Abbrescia, M.; AbdusSalam, S. S.; O'Callaghan Castellà, Juan Manuel (Springer, 2019-07-01)
    Article
    Open Access
    In response to the 2013 Update of the European Strategy for Particle Physics (EPPSU), the Future Circular Collider (FCC) study was launched as a world-wide international collaboration hosted by CERN. The FCC study covered ...
  • FCC physics opportunities: future circular collider conceptual design report volume 1 

    Abada, A.; Abbrescia, M.; AbdusSalam, S. S.; O'Callaghan Castellà, Juan Manuel (Springer, 2019-06-05)
    Article
    Open Access
    We review the physics opportunities of the Future Circular Collider, covering its e+e-, pp, ep and heavy ion programmes. We describe the measurement capabilities of each FCC component, addressing the study of electroweak, ...