Ara es mostren els items 1-13 de 13

    • A model to explain the TSDC spectrum of XLPE insulation in mid voltage cables based on a virtual electrode 

      Belana Punseti, Juan; Diego Vives, José Antonio; Orrit Prat, Jordi; Mudarra López, Miguel (2007)
      Comunicació de congrés
      Accés obert
      The analysis by TSDC of a large variety of cables subjected to long annealing times, has resulted in spectra that sometimes show an oscillation of the current peak observed at 99°C. This process has been observed in some ...
    • Comparative dielectric and thermally stimulated-depolarization-current studies of the liquid crystal dimers 1¿,9¿-bis(4-cyanobiphenyl-4'-yl) nonane and heptane and a binary mixture between them, close to the glass transition 

      Sellarès González, Jordi; Diego Vives, José Antonio; López Pérez, David Orencio; Salud Puig, Josep; Robles Hernández, Beatriz; de la Fuente Lavin, Maria Rosario; Cañadas Lorenzo, Juan Carlos; Mudarra López, Miguel; López de Rioja, Víctor; Levit Valenzuela, Rafael; Díez Berart, Sergio (American Institute of Physics (AIP), 2022-11-21)
      Article
      Accés obert
      We have performed dielectric spectroscopy and thermally stimulated-depolarization-current experiments to study the molecular dynamics of the twist-bend nematic phase close to the glass transition of two members of the ...
    • Comparative study of mechanical and electrical relaxations in poly(etherimide). Part 2 

      Diaz Calleja, Ricardo; Friederichs, S.; Jaímes, C.; Sanchis, Jose Maria; Belana Punseti, Juan; Cañadas Lorenzo, Juan Carlos; Diego Vives, José Antonio; Mudarra López, Miguel (1998-05)
      Article
      Accés restringit per política de l'editorial
      The curves describing the relaxation behaviour of poly(etherimide) at several frequencies shows in the dielectric lossÈtemperature plot c and b relax- ations centred at [95¡C and 100¡C, respectively, at 10 Hz. The glassÈrubber ...
    • Comparison of pulsed electroacoustic and thermally stimulated depolarization current measurements of thermally poled PET electrets 

      Parsa, Seyedeh Elaheh; Cañadas Lorenzo, Juan Carlos; Diego Vives, José Antonio; Mudarra López, Miguel; Sellarès González, Jordi (Elsevier, 2022-09-01)
      Article
      Accés restringit per política de l'editorial
      We have compared measurements of a set of polyethylene terephthalate (PET) electret samples by means of pulsed electroacoustic method (PEA) and thermally stimulated depolarization current (TSDC) techniques. Samples where ...
    • Confección y gestión automática de exámenes tipo test 

      Cañadas Lorenzo, Juan Carlos; Diego Vives, José Antonio; Pelayo Melero, Ignacio Manuel (Universidad de Cádiz, 2016)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      El presente trabajo describe la implementación de una aplicación informática como recurso docente, diseñada como plataforma para la elaboración, utilización y corrección de controles formativos y exámenes de evaluación. ...
    • Effect of humidity in charge formation and transport in LDPE 

      Aragoneses Aguado, Andrés; Tamayo, Ildaberto; Lebrato, Alexander; Cañadas Lorenzo, Juan Carlos; Diego Vives, José Antonio; Arencón Osuna, David; Belana Punseti, Juan (2013-04-02)
      Article
      Accés restringit per política de l'editorial
    • Effects of UV radiation on the charge trapping capability of PET 

      Cañadas Lorenzo, Juan Carlos; Diego Vives, José Antonio; Mudarra López, Miguel; Parsa, Seyedeh Elaheh; Sellarès González, Jordi (Institute of Physics (IOP), 2019-02-06)
      Article
      Accés obert
      Poly(ethylene terephthalate) (PET) is able to retain space charge in traps, as is usual in dielectric materials. This allows the material to attain an almost permanent polarization when space charge is displaced by an ...
    • Influence of internal flexibility on the double glass transition in a series of odd non-symmetric liquid crystal dimers characterised by dielectric measurements 

      Diego Vives, José Antonio; Sellarès González, Jordi; Díez Berart, Sergio; Salud Puig, Josep; Cañadas Lorenzo, Juan Carlos; Mudarra López, Miguel; López Pérez, David Orencio; de la Fuente Lavin, Maria Rosario; Ros, M Blanca (2017-04-11)
      Article
      Accés obert
      Dielectric measurements (thermally stimulated depolarisation currents and broadband dielectric spectroscopy) have been performed near the glass transition to study the glass transition on the odd non-symmetric liquid crystal ...
    • Pràctiques de l'assignatura 

      Botey Cumella, Muriel; Martorell Pena, Jordi; Belana Punseti, Juan; Carloa Cañadas, Joan; Diego Vives, José Antonio; Font García, Josep Lluís; Martin, Josep; Mudarra López, Miguel; Vilaseca Alavedra, Ramon; Calaf Zayas, Jaume; García Ojalvo, Jordi (Universitat Politècnica de Catalunya, 2000)
      Pràctica
      Accés obert
    • Space charge measurements in XLPE insulated mid-voltage cable: correlation with cable performance 

      Tamayo Ávila, Idalberto; Orrit Prat, Jordi; Diego Vives, José Antonio (2007)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      Three experimental midvoltage XLPE cables, C2, C3 and C4, rated respectively as 'good', 'very good' and 'bad' in perforation tests, are studied. All these cables have been systematically measured by PEA as produced and ...
    • Study of dispersive mobility in polyimide by surface voltage decay measurements 

      Aragoneses Aguado, Andrés; Mudarra López, Miguel; Belana Punseti, Juan; Diego Vives, José Antonio (ELSEVIER PUBLISHER, 2008-05)
      Article
      Accés obert
      In order to study charge trapping and transport in polyimide, we have submitted samples of Kapton HN to corona charging and measured its surface potential decay with an electrostatic voltmeter. We propose a two terms ...
    • Sublinear dispersive conductivity in polyetherimides by the electric modulus formalism 

      Mudarra López, Miguel; Sellarès González, Jordi; Cañadas Lorenzo, Juan Carlos; Diego Vives, José Antonio (2015-12)
      Article
      Accés obert
      Two commercially available polyetherimides, Ultem 1000 and Ultem 5000, have been studied by means of Dynamic Electrical Analysis. Results show that at temperatures above the glass transition dielectric response is highly ...
    • Two glass transitions associated to different dynamic disorders in the nematic glassy state of a non-symmetric liquid crystal dimer dopped with gamma-alumina nanoparticles 

      Díez Berart, Sergio; López Pérez, David Orencio; Salud Puig, Josep; Diego Vives, José Antonio; Sellarès González, Jordi; Robles Hernández, Beatriz; De la Fuente, Maria Rosario; Blanca Ros, María (2015-06-01)
      Article
      Accés obert
      In the present work, the nematic glassy state of the non-symmetric LC dimer -(4-cyanobiphenyl-4-yloxy)--(1-pyrenimine-benzylidene-4-oxy) undecane is studied by means of calorimetric and dielectric measurements. The most ...