Ara es mostren els items 21-28 de 28

    • Online cellphone battery entropy measurement for SoH estimation 

      Cuadras Tomàs, Àngel; Meinert, Florian; Büschel, Paul; Kanoun, Olfa (2016)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The widespread use of batteries requires knowledge of their state of health (SoH). In this paper we present a method to use entropy evolution as an aging indicator for batteries. Voltage, current and temperature are ...
    • Pyroelectric conversion: harvesting energy from temperature fluctuations 

      Cuadras Tomàs, Àngel (2007-11)
      Text en actes de congrés
      Accés obert
    • Pyroelectric sensor for entropy measurements 

      Cuadras Tomàs, Àngel; Ovejas Benedicto, Victòria Júlia (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this contribution we propose a system to measure entropy fluctuations in thermal systems. The system consist of a pyroelectric sensor and a temperature sensor. The pyroelectric convert thermal variations into electrical ...
    • SoH evaluation of LiFePO4 cells using impedance and thermal measurements 

      Ovejas Benedicto, Victòria Júlia; Cuadras Tomàs, Àngel; Morante Lleonart, Joan Ramon (2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      LiFePO4 is a promising cathode material used in Li-ion batteries. It offers better cyclability and is safer in terms of thermal runaway than previous LiCoO2 or LiMnO2 cathodes. With new applications as electric vehicles ...
    • State of charge dependency of the overvoltage generated in commercial Li-ion cells 

      Ovejas Benedicto, Victòria Júlia; Cuadras Tomàs, Àngel (2019-04-01)
      Article
      Accés obert
      The overvoltage that is produced in the cells under operation limits the capacity and power they can deliver. A detailed study about the mechanisms that contribute to that overvoltage—and thus to their lifetime—is required ...
    • Supercapacitor impedance in time and frequency domains 

      Cuadras Tomàs, Àngel; Ovejas Benedicto, Victòria Júlia (IEEE, 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this contribution we estimate supercapacitor impedance from temporal measurements from two points of view: i) fitting a predefined model to the temporal data and ii) transform time domain analysis to frequency domain ...
    • Technical specifications and system architecture of a compact weather station for rice blast field study 

      Pallàs-Areny, Ramon; Casas Piedrafita, Óscar; López Lapeña, Oscar; Hornero Ocaña, Gemma; Serrano Finetti, Roberto Ernesto; Quílez Figuerola, Marcos; Polo Cantero, José; Cuadras Tomàs, Àngel; PEREIRAS, Jaime; PUIGDOLLERS, Pau (2014-03-17)
      Report de recerca
      Accés restringit per acord de confidencialitat
      This report describes the work carried out as part of an EC-funded project called RICE-GUARD, which is developing a novel rice blast prediction tool based on an in-field wireless sensor network. Existing systems for ...
    • Thermal energy harvesting through pyroelectricity 

      Cuadras Tomàs, Àngel; Gasulla Forner, Manuel; Ferrari, Vittorio (2010-03)
      Article
      Accés restringit per política de l'editorial
      Pyroelectric cells based on fabricated screen-printed PZT and commercial PVDF films are proposed as thermal energy harvesting sources in order to supply low-power autonomous sensors. The cells are electrically modelled ...