Exploració per tema "Impedance"

Ara es mostren els items 1-20 de 21

    • A fast method to estimate body capacitance to ground 

      Aliau Bonet, Carles; Pallàs-Areny, Ramon (2012)
      Text en actes de congrés
      Accés obert

    • A Stiffness-fault-tolerant control strategy for an elastically actuated powered knee orthosis 

      Velasco-Guillen, Rodrigo J.; Grosu, Victor; Carmona Ortiz, Víctor A.; Vanderborght, Bram; Lefeber, Dirk; Font Llagunes, Josep Maria; Beckerle, Philipp (Institute of Electrical and Electronics Engineers (IEEE), 2020)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Elastic actuators can provide safe human-robot interaction and energy efficient mobility. For this purpose they are ideal for wearable robotic applications. However, such actuators are subject to stiffness faults. We present ...

    • Alternative conducted immunity tests 

      Cakir, S.; Azpúrua Auyanet, Marco Aurelio; Silva Martínez, Fernando; Cetintas, Mustafa (2016-12-14)
      Article
      Accés obert
      Conducted immunity tests are always performed by the use of CDNs in laboratories in accordance with the standard EN61000-4-6. However, it is not always possible to use CDNs because of some limitations. If the EUT (Equipment ...

    • Analysis on the effects of the human body on the performance of wearable textile antenna in substrate integrated waveguide technology 

      El Gharbi, Mariam; Ahyoud, Saida; Aknin, Noura; Gil Galí, Ignacio; Fernández García, Raúl (Institute of Electrical and Electronics Engineers (IEEE), 2020)
      Text en actes de congrés
      Accés obert
      A wearable textile circular ring slot antenna based on a substrate integrated waveguide cavity is presented. In this paper, the focus is on studying and understanding the technical behavior of the SIW textile antenna when ...

    • Design of an impedance source converter for high-performance PV power system applications 

      Izquierdo Gómez, Pere (Universitat Politècnica de Catalunya, 2018-07-18)
      Treball Final de Grau
      Accés obert
      Realitzat a/amb:   Aalborg universitet
      This project describes the principles of impedance-source/quasi-impedancesource inverters, which have the main particularity of being able to operate as voltage-boost inverters. Therefore, the appropriate circuit ...

    • Determination of the state of health of Li-ion batteries : the irreversible entropy production approach 

      Ovejas Benedicto, Victòria Júlia (Universitat Politècnica de Catalunya, 2017-11-24)
      Tesi
      Accés obert
      In recent years, portable applications have experienced an exponential growth and consequently, the demand of batteries has increased accordingly. It is widely known, though, that the performance of batteries decreases ...

    • Electro-textile UHF-RFID compression sensor for health-caring applications 

      Luo, Chengyang; Gil Galí, Ignacio; Fernández García, Raúl (2022-06-15)
      Article
      Accés obert
      Electro-textile Ultra High Frequency (UHF, 865–868 MHz) Radio Frequency Identification (RFID) devices have great potential to be explored as sensors due to the features of fabric materials. In this work, an electro-textile ...

    • Enhancing RFID sensing capabilities: multi-load backscattering 

      Capdevila Cascante, Santiago; Jofre Roca, Lluís; Romeu Robert, Jordi; Bolomey, Jean Charles (2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This conference paper presents some experimental results using the concept of an multi-loaded enhanced RFID tag capable of switching between different loads to fully determine the input impedance of the RFID tag antenna ...

    • Espectroscopia de impedancias aplicada al análisis de células solares 

      Sinde Carbajo, Daniel Carlos (Universitat Politècnica de Catalunya, 2015-10)
      Projecte Final de Màster Oficial
      Accés obert
      At the present project a set of measurements of solar cells have been done with the use of Impedance Spectroscopy. The main fact of the project is the fabrication of printed circuit boards that allowed the direct contact ...

    • Flexible grid connection and islanding of SPC-based PV power converters 

      Rodríguez Cortés, Pedro; Citro, Costantino; Candela García, José Ignacio; Rocabert Delgado, Joan; Luna Alloza, Álvaro (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Text en actes de congrés
      Accés obert
      Photovoltaic power plants (PV) are equipped with anti-islanding algorithms, embedded in the converters controller, to avoid the island operation. However, the current trends in the development of the future electrical ...

    • Hemostasis-on-a-chip: Impedance spectroscopy meets microfluidics for hemostasis evaluation 

      Karimi, Shadi; Farré Lladós, Josep; Mir Fuertes, Enrique; Escolar Albaladejo, Ginés; Casals Terré, Jasmina (2019-08-14)
      Article
      Accés obert
      In the case of vascular injury, a complex process (of clotting) starts, involving mainly platelets and coagulation factors. This process in healthy humans is known as hemostasis, but when it is deregulated (thrombosis), ...

    • On the feasibility of noncontact ECG measurements 

      Pallàs-Areny, Ramon; Casas Piedrafita, Óscar (2016-03-01)
      Article
      Accés obert
      The article by Kranjec et al. [1], “Novel methods of noncontact heart rate measurement: A feasibility study” is interesting and informative as it compares different contactless methods for heart rate detection. Nevertheless, ...

    • Perpetual reconfigurable intelligent surfaces through in-band energy harvesting: architectures, protocols, and challenges 

      Ntontin, Konstantinos; Boulogeorgos, Alexandros Apostolos A.; Abadal Cavallé, Sergi; Mesodiakaki, Agapi; Chatzinotas, Symeon; Ottersten, Björn (Institute of Electrical and Electronics Engineers (IEEE), 2024-03)
      Article
      Accés obert
      Reconfigurable intelligent surfaces (RISs) are considered a key enabler of highly energy-efficient 6G and beyond networks. This property arises from the absence of power amplifiers in the structure, in contrast to active ...

    • Positive and Negative Sequence Control Strategies to Maximize the Voltage Support in Resistive-Inductive Grids During Grid Faults 

      Camacho Santiago, Antonio; Castilla Fernández, Miguel; Miret Tomàs, Jaume; García de Vicuña Muñoz de la Nava, José Luis; Guzmán Solà, Ramon (2017-07-27)
      Article
      Accés obert
      Grid faults are one of the most severe perturbations in power systems. During these extreme disturbances, the reliability of the grid is compromised and the risk of a power outage is increased. To prevent this issue, ...

    • Practical issues on the implementation of acoustic transversal filters 

      Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; Aigner, Robert (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      This paper evaluates important aspect of acoustic filters based on a transversal configuration in order to foreseen the potential and limitations of this new configuration. These aspects are: effects of the losses of the ...

    • Programmable metasurfaces: state of the art and prospects 

      Liu, Fu; Pitilakis, Alexandros; Mirmoosa, Mohammad Sajjad; Tsilipakos, Odysseas; Wang, Xuchen; Tasolamprou, Anna; Abadal Cavallé, Sergi; Cabellos Aparicio, Alberto; Alarcón Cot, Eduardo José; Liaskos, Christos; Kantartzis, Nikolaos V.; Kafesaki, Maria; Economou, Eleftherios; Soukoulis, Costas; Tretyakov, Sergei (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Text en actes de congrés
      Accés obert
      Metasurfaces, ultrathin and planar electromagnetic devices with sub-wavelength unit cells, have recently attracted enormous attention for their powerful control over electromagnetic waves, from microwave to visible range. ...

    • Resonance-based procedure for locating failed luminaires in AGL systems 

      Vidal, Daniel; Monjo, Luis; Sainz Sapera, Luis (2018-02)
      Article
      Accés obert
      IEEE Aeronautical ground lighting (AGL) systems provide a visual reference for aircraft during airport operations. Fast detection and location of failed luminaires is an important safety concern in AGL systems. In the event ...

    • 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 ...

    • Textile UHF-RFID antenna embroidered on surgical masks for future textile sensing applications 

      Luo, Chengyang; Gil Galí, Ignacio; Fernández García, Raúl (2022-07)
      Article
      Accés obert
      Ultra High Frequency (UHF, 865-868 MHz) Radio Frequency Identification (RFID) devices are expected to be implemented in many health-caring areas. In this paper, we present three progressive designs of textile UHF-RFID ...

    • Transient Reduction in pulse-based impedance measurements, 

      Aliau Bonet, Carles; Pallàs-Areny, Ramon (2013)
      Text en actes de congrés
      Accés obert
      Impedance measurements based on voltage pulse injection and current detection are faster and easier to implement than measurements based on sine waves, but transients produced in the current-to-voltage conversion may lead ...