Exploració per autor "Cuadras Tomàs, Àngel"Més informacióMés informació

Ara es mostren els items 9-28 de 28

    • Effects of cycling on lithium-ion battery hysteresis and overvoltage 

      Ovejas Benedicto, Victòria Júlia; Cuadras Tomàs, Àngel (Nature, 2019-10-16)
      Article
      Accés obert
      Currently, lithium-ion batteries are widely used as energy storage systems for mobile applications. However, a better understanding of their nature is still required to improve battery management systems (BMS). Overvoltages ...

    • Entropy as a wear out indicator: The resistor example 

      Cuadras Tomàs, Àngel; Ovejas Benedicto, Victòria Júlia; Quílez Figuerola, Marcos (2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this contribution we aim at proposing entropy measurements in resistive elements to characterize the induced damage due to current and Joule effect dissipation. 0.25 W off the shelf resistors are biased with constant ...

    • Entropy characterisation of overstressed capacitors for lifetime prediction 

      Cuadras Tomàs, Àngel; Romero, Ramón; Ovejas Benedicto, Victòria Júlia (2016-12-30)
      Article
      Accés obert
      We propose a method to monitor the ageing and damage of capacitors based on their irreversible entropy generation rate. We overstressed several electrolytic capacitors in the range of 33 µF–100 µF and monitored their entropy ...

    • Entropy generation model to estimate battery ageing 

      Cuadras Tomàs, Àngel; Miró Jané, Pol; Ovejas Benedicto, Victòria Júlia; Estrany Coda, Francesc (Elsevier, 2020-12)
      Article
      Accés obert
      Determining battery ageing is a key issue in predicting the available charge in battery-operated systems. Beyond the common use of voltage or current measurements, which have proved unsuccessful as general methods, we aim ...

    • Espacio Virtual de Electrónica Analógica (EVEA): Experiencias multimedia en el Aula 

      Cuadras Tomàs, Àngel; Hornero Ocaña, Gemma; Serrano Finetti, Roberto Ernesto; López Sánchez, Jaime; Garrido Gonzalez, Miguel; Gasulla Forner, Manuel (Escuela Universitaria Politécnica, Universidad de Las Palmas de Gran Canaria, 2005)
      Text en actes de congrés
      Accés obert
      El proyecto Espacio Virtual de Electrónica Analógica (EVEA) constituye un entorno virtual, accesible desde internet, que integra los contenidos de electrónica analógica presentes en diferentes asignaturas de la titulación ...

    • EVEA: espai virtual d'electrònica analògica 

      Cuadras Tomàs, Àngel; Hornero Ocaña, Gemma; Serrano Finetti, Roberto Ernesto; Gasulla Forner, Manuel (2006-02)
      Text en actes de congrés
      Accés obert
      El projecte Espai Virtual d’Electrònica Analògica (EVEA) constitueix un entorn virtual, accessible des d’internet, que integra els continguts d’electrònica analògica presents en diferents assignatures de la titulació ...

    • Heterogeneous degradation in Li-ion batteries 

      Ovejas Benedicto, Victòria Júlia; Cuadras Tomàs, Àngel (2023)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      Li-ion batteries are crucial for the forthcoming energy transition. They are complex systems that show heterogeneous current distribution patterns and degradation. The development of valid methods to determine their internal ...

    • Impact of cars entropy flows in climate change 

      Cuadras Tomàs, Àngel; Ovejas Benedicto, Victòria Júlia (2023)
      Comunicació de congrés
      Accés obert
      Climate change is an important research topic due to the catastrophic impact that may have in human societies. We evaluate the entropy flows generated by cars to estimate the most efficient car transport and its impact in ...

    • Impedance characterization of an LCO-NMC/graphite cell: ohmic conduction, SEI transport and charge-transfer phenomenon 

      Ovejas Benedicto, Victòria Júlia; Cuadras Tomàs, Àngel (Multidisciplinary Digital Publishing Institute (MDPI), 2018-09-10)
      Article
      Accés obert
      Currently, Li-ion cells are the preferred candidates as energy sources for existing portable applications and for those being developed. Thus, a proper characterization of Li-ion cells is required to optimize their use and ...

    • Irreversible entropy model for damage diagnosis in resistors 

      Cuadras Tomàs, Àngel; Crisóstomo, Javier; Ovejas Benedicto, Victòria Júlia; Quílez Figuerola, Marcos (American Institute of Physics (AIP), 2015-10-28)
      Article
      Accés obert
      We propose a method to characterize electrical resistor damage based on entropy measurements. Irreversible entropy and the rate at which it is generated are more convenient parameters than resistance for describing damage ...

    • MATLAB® modeling of a microgrid: towards a vision based on entropy balance 

      Khan, Ameer Abdullah; Martínez García, Herminio; Cuadras Tomàs, Àngel (2023-07-01)
      Article
      Accés obert
      A microgrid is defined as the link of consumer loads and decentralized energy assets with the ability to control the entire system as a whole. The modeling of an electromagnetic microgrid is discussed in this work to analyze ...

    • MATLAB® modeling of a microgrid: towards a vision based on entropy balance 

      Khan, Ameer Abdullah; Martínez García, Herminio; Cuadras Tomàs, Àngel (AEDERMACP (European Association for the Development of Renewable Energies and Power Quality), 2023)
      Text en actes de congrés
      Accés obert
      A microgrid is defined as the link of consumer loads and decentralized energy assets with the ability to control the entire system as a whole. The modeling of an electromagnetic microgrid is discussed in this work to analyze ...

    • 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 ...