Exploració per autor "O'Callaghan Castellà, Juan Manuel"Més informacióMés informació

Ara es mostren els items 36-55 de 124

    • Dielectric resonator to measure surface resistance of accelerator components at room temperature and 77 K 

      Brunner, Kristóf; Krkotic, Patrick; Costa Pinto, Pedro; Gibbons Díaz-Rato, Eduardo; Pfeiffer, Stephan; Vollenberg, Wilhelmus; Calatroni, Sergio; Barna, Dániel; Pont Montaner, Montserrat; O'Callaghan Castellà, Juan Manuel (American Physical Society (APS), 2023-08)
      Article
      Accés obert
      We measured the surface resistance of titanium, amorphous carbon, and nonevaporable getter (NEG) coatings on copper samples, representative of surface treatments of beam-facing components in the High-Luminosity Large Hadron ...

    • 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
      Accés obert
      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
      Accés obert
      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 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
      Accés obert
      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 ...

    • 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
      Accés obert
      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 ...

    • Evaluation of the nonlinear surface resistance of REBCO coated conductors for their use in the FCC-hh beam screen 

      Krkotic, Patrick; Romanov, Artur; Tagdulang, Nikki; Telles, Guilherme; Puig Molina, Teresa; Gutiérrez Royo, Joffre; Granados García, Xavier; Calatroni, Sergio; Pérez, Francis; Pont Montaner, Montserrat; O'Callaghan Castellà, Juan Manuel (2022-01-07)
      Article
      Accés obert
      To assess the feasibility of using high-temperature superconductors for the beam screens of future circular colliders, we have undertaken a study of the power dependence of the microwave surface resistance in state-of-the-art ...

    • 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
      Accés obert
      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. ...

    • 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)
      Examen
      Accés restringit a la comunitat UPC

    • 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)
      Examen
      Accés restringit a la comunitat UPC

    • 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
      Accés obert
      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 ...

    • FCC physics opportunities: future circular collider conceptual design report volume 1 

      Abada, A.; Abbrescia, M.; AbdusSalam, S. S.; O'Callaghan Castellà, Juan Manuel; Krkotic, Patrick (Springer, 2019-06-05)
      Article
      Accés obert
      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, ...

    • FCC-ee: the Lepton Collider: future circular collider conceptual design report volume 2 

      O'Callaghan Castellà, Juan Manuel (Springer, 2019-06-01)
      Article
      Accés obert
      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; Krkotic, Patrick (Springer, 2019-07-01)
      Article
      Accés obert
      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 ...

    • Fet noise-parameter determination using a novel technique based on 50 noise measurements 

      Lázaro Guillén, Antoni; Pradell i Cara, Lluís; O'Callaghan Castellà, Juan Manuel (IEEE, 1999)
      Article
      Accés obert
      A novel method for measuring the four noise parameters of a field-effect transistor (FET) is presented. It is based on the determination of its intrinsic noise matrix elements [C11INT, C22INT, Re(C12 INT), Im(C12INT)] by ...

    • FET noise-parameter determination using a novel technique based on 50 noise measurements 

      Lázaro Guillén, Antoni; Pradell i Cara, Lluís; O'Callaghan Castellà, Juan Manuel (IEEE Microwave Theory and Techniques Society, 1999-03)
      Article
      Accés obert
      A novel method for measuring the four noise parameters of a field-effect transistor (FET) is presented. It is based on the determination of its intrinsic noise matrix elements [CINT 11 , CINT 22 , Re(CINT 12 ), Im(CINT 12 ...

    • Final exam microwaves 

      O'Callaghan Castellà, Juan Manuel; Corbella Sanahuja, Ignasi; Pradell i Cara, Lluís (Universitat Politècnica de Catalunya, 2020-06-19)
      Examen
      Accés restringit a la comunitat UPC

    • Full wave analysis of the image hybrid dielectric/hts resonator 

      Sans, C; O'Callaghan Castellà, Juan Manuel; Sancho, D; Pous Andrés, Rafael; Fontcuberta, J; Ji-Fuh, Liang; Guo-Chun, Liang (1997-12)
      Article
      Accés obert
      — An analysis of the image hybrid dielectric/hightemperature superconductor (HTS) resonator is carried out. A full-wave radial mode-matching method is used to obtain the electromagnetic fields inside the resonator for ...

    • Full wave analysis of the image hybrid dielectric/HTS resonator 

      Sans, C.; O'Callaghan Castellà, Juan Manuel; Sancho, D.; Pous Andrés, Rafael; Fontcuberta, Josep; Liang, Ji-fhu; Liang, Guo-chun (IEEE, 1997-12-31)
      Article
      Accés obert
      An analysis of the image hybrid dielectric / high-temperature superconductor (HTS) resonator is carried out. A full-wave radial mode-matching method is used to obtain the electromagnetic fields inside the resonator for ...

    • Full wave analysis of the image hybrid dielectric/HTS resonator 

      Sans, C; O'Callaghan Castellà, Juan Manuel; Sancho, D; Pous Andrés, Rafael; Fontcuberta, J; Ji-Fuh, Liang; Guo-Chun, Liang (Institution of Electrical Engineers, 1997-06)
      Article
      Accés obert
      An analysis of the image hybrid dielectric/HTS resonator is carried out. A full-wave radial mode-matching method is used to obtain the electromagnetic fields inside the resonator for single TE01 and dual HE11 modes. The ...

    • Full wave modelling of hts dual mode patch filters and staggered coupled-line filters 

      Flores, A; Collado, C; Sans, C; O'Callaghan Castellà, Juan Manuel; Pous Andrés, Rafael; Fontcuberta, J (1997-06)
      Article
      Accés obert
      In order to obtain high-power hzuidlirig, dual-nlode patch HTS filters have been analyzed through Green’s function rad desegmentation techniques. A precise circuit model has been obtained and applied to the filter design ...