Now showing items 1-18 of 18

    • A Free accessible individual-based simulator enabling virtual experiments on soil organic matter processes in classroom 

      Gras Moreu, Anna Maria; Cañadas Lorenzo, Juan Carlos; Ginovart Gisbert, Marta (Universitat Politècnica de Catalunya. Institut de Ciències de l'Educació, 2013-09)
      Article
      Open Access
      This work addresses and aims to fulfil a very clear need in teaching biosystem engineering. When introducing students to the complexity of soil processes, one of the frustrations that teachers ofen experience is ...
    • Aprendizaje colaborativo en base a problemas mediante el uso del foro electrónico 

      Buenestado Caballero, Pablo; Minelli de Oliveira, Janaina; Moragas Gascons, Lluís; Rodríguez Pérez, Ana Carmen; Cañadas Lorenzo, Juan Carlos; Pelayo Melero, Ignacio Manuel (2012-06-15)
      Part of book or chapter of book
      Open Access
      La incorporación de las plataformas digitales en la educación impulsa nuevas maneras de aprender. La universidad promueve la participación sincrónica y asincrónica entre sujetos que no están en el mismo lugar, ni al mismo ...
    • Charge storage and retention in electret dielectric layers for energy harvesting applications 

      Diáz-Ballester, A.; Castillo-Anguera, S; Rafi, J. M.; Gómez-Martínez, R.; Abadal, G.; Figueras, E.; Plaza, J.A.; Esteve, J.; Mudarra López, Miguel; Cañadas Lorenzo, Juan Carlos (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Conference report
      Restricted access - publisher's policy
      By providing a permanent electric polarization, electrets have a wide range of applications in different fields like sensors and actuators, energy harvesting or biomedicine. Stable electrets with silicon-based compatible ...
    • 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
      Open Access
      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
      Restricted access - publisher's policy
      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
      Restricted access - publisher's policy
      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)
      Conference lecture
      Restricted access - publisher's policy
      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
      Restricted access - publisher's policy
    • 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
      Open Access
      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 ...
    • ESTÀTICA I DINÀMICA (Examen 1r Quadr.) 

      Cañadas Lorenzo, Juan Carlos (Universitat Politècnica de Catalunya, 2005-01-11)
      Exam
      Restricted access to the UPC academic community
    • ESTÀTICA I DINÀMICA (Examen 2n Quadr.) 

      Cañadas Lorenzo, Juan Carlos (Universitat Politècnica de Catalunya, 2004-06-18)
      Exam
      Restricted access to the UPC academic community
    • Estudio del efecto de la cristalización fría y del envejecimiento físico en las relajaciones de los polímeros mediante la técnica de corrientes estimuladas térmicamente 

      Cañadas Lorenzo, Juan Carlos (Universitat Politècnica de Catalunya, 1999-02-05)
      Doctoral thesis
      Open Access
      Los resultados que se analizan en este trabajo proceden fundamentalmente de dos polímeros (PET, PEN) y hemos utilizado esencialmente la técnica TSC centrándonos en el comportamiento de los mecanismos de conducción ligados ...
    • INDISIM-SOM, an individual-based simulator on a website for experimenting and investigating diverse dynamics of Carbon and Nitrogen in mineral soils 

      Gras Moreu, Anna Maria; Cañadas Lorenzo, Juan Carlos; Ginovart Gisbert, Marta (2009)
      Conference report
      Restricted access - publisher's policy
      INDISIM-SOM models the dynamics and evolution of C and N related to organic matter in soils by using individual-based simulations. It is an Individual-based Model that controls a group of microbial cells at each time step, ...
    • 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
      Open Access
      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 ...
    • Method to distinguish between space-charge and dipolar relaxation in the TSDC spectra of polyethylene electrical insulation 

      Orrit Prat, Jordi; Cañadas Lorenzo, Juan Carlos; Sellarès González, Jordi; Belana Punseti, Juan (2010)
      Conference lecture
      Open Access
      Medium-voltage cross-linked polyethylene (MV-XLPE) cables have an important role in the electrical power distribution system. For this reason, the study of XLPE insulation may lead to improve cable features and lifetime. ...
    • Project of the academic performance improvement 

      Amante García, Beatriz; Sánchez Romero, Montserrat; Sunyer, Marta; Vela Torres, Patricia; Macarulla Martí, Marcel; Roca Ramon, Xavier; Macanás de Benito, Jorge; Amer Ramon, Rafael; Haro Cases, Jaume; Hernández Abad, Francisco; Cañadas Lorenzo, Juan Carlos (Universitat Politècnica de Catalunya, 2022-09)
      Conference report
      Open Access
      The transition of students from high school to university is a changing and complicated stage. It is during the initial phase when most drop-outs from engineering degrees occur. There are several reasons for this, however, ...
    • Proyecto de mejora del rendimiento académico. Fase Inicial : primer curso del Grado de Ingeniería de la ESEIAAT 

      Roca Ramon, Xavier; Sánchez Romero, Montserrat; Amante García, Beatriz; Garin Seijo, Marta; Amador Pla, Fernando; Cortés Izquierdo, María Pilar; Cañadas Lorenzo, Juan Carlos; Haro Cases, Jaume; Amer Ramon, Rafael; Hernández Abad, Francisco; Macarulla Martí, Marcel (Universitat Politècnica de Catalunya. Institut de Ciències de l'Educació, 2021-05)
      Article
      Open Access
      La transición del alumnado del instituto a la universidad es compleja y costosa. Durante las fases iniciales es donde se producen la mayor parte de los abandonos en las titulaciones de ingeniería. Los motivos son varios, ...
    • 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
      Open Access
      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 ...