• Alimentació adaptativa d'un generador d'ultrasons de potència basada en un convertidor ressonant paral.lel controlat per un DSC 

    Calduch Cobos, Rubén (Universitat Politècnica de Catalunya, 2010-12-15)
    Proyecto/Trabajo final de carrera
    Acceso abierto
    Català: Disseny i fabricació d'una font d'alimentació per a transductors d'ultrasons de potència. Font d'alimentació formada per un convertidor ressonant DC/AC i controlada per un DSC que corregeix la freqüencia de sortida ...
  • Design of a GUI based on the implemented IEEE1451 Standard in a Wireless Sensor Network 

    Ardanuy Comas, Xavier (Universitat Politècnica de Catalunya, 2014-07-24)
    Trabajo final de grado
    Acceso abierto
    Realizado en/con:  Technische Universität Berlin
    [ANGLÈS] Wireless Sensor Networks are widely used in different fields for monitoring and controling purposes. The family of standards IEEE1451 defines a set of communications interfaces between the sensors and the ...
  • Double Optical Feedback Interferomety for biomedical applications 

    Arasanz Tena, Andrés (Universitat Politècnica de Catalunya, 2013-07-19)
    Projecte Final de Màster Oficial
    Acceso abierto
    [ANGLÈS] Optical Feedback Interferometry (OFI) and Double Optical Feedback interferometry (DOFI) are studied as non-invasive techniques for biomedical measurements. Due to its compactness and cost-effectiveness, both sensors ...
  • Estudi i caracterització de la resposta elèctrica d’elements piezoelèctrics davant diferents excitacions 

    Ortega Olivares, Jordi (Universitat Politècnica de Catalunya, 2017-06)
    Trabajo final de grado
    Acceso abierto
    L’objectiu d’aquest estudi és determinar les condicions òptimes de les tensions mecàniques, vibracions, a les que estaran sotmesos els transductors piezoelèctrics del tipus PI-876.A12 per aconseguir la màxima resposta ...
  • Evaluation of trr distorting effects reduction in DCI-NPC multilevel power amplifiers by using SiC diodes and MOSFET technologies 

    Sala Caselles, Vicenç; Resano, Tomas; Romeral Martínez, José Luis; Moreno Eguilaz, Juan Manuel (Curran, 2013)
    Texto en actas de congreso
    Acceso restringido por política de la editorial
    In the last decade, the Power Amplifier applications have used multilevel diode-clamped-inverter or neutral-point-clamped (DCI-NPC) topologies to present very low distortion at high power. In these applications a lot of ...
  • High voltage pulser for NDE air-coupled lamb wave ultrasonic system 

    García Rodríguez, Mercedes; Arjones, V.; Yañez, Y.; García Hernández, Miguel J.; Salazar Soler, Jorge; Turó Peroy, Antonio; Chávez Domínguez, Juan Antonio (American Institute of Physics (AIP), 2010)
    Texto en actas de congreso
    Acceso restringido por política de la editorial
    This paper describes a high voltage pulser developed for an air-coupled ultrasonic array NDE system based on Lamb waves. Unlike the classical single pulse excitation circuits, this pulser is able to generate a bipolar ...
  • Implementación de un transponder 64QAM en FPGA mediante Simulink 

    Alonso Varela, Marc (Universitat Politècnica de Catalunya, 2016-09)
    Trabajo final de grado
    Acceso abierto
    The current evolution of communication systems has been driven by the high demand of resources that are needed to satisfy services which are dependent of the network. To contain the high requirements of current and emerging ...
  • Laser interferometric measurements of air-coupled lamb waves 

    García Rodríguez, Mercedes; Yañez, Y.; García Hernández, Miguel J.; Salazar Soler, Jorge; Turó Peroy, Antonio; Chávez Domínguez, Juan Antonio (American Institute of Physics (AIP), 2010)
    Texto en actas de congreso
    Acceso restringido por decisión del autor
    In this paper, experimental measurements of the vibration pattern that results when an air-coupled A0 Lamb wave mode propagates in a plate are presented. Lamb waves are generated using an air-coupled piezoelectric transducer ...
  • Low Consumption Flux-Gate Transducer 

    Román Lumbreras, Manuel; Velasco Quesada, Guillermo; Conesa Roca, Alfons; Jerez, Felipe (2009-07)
    Artículo
    Acceso abierto
  • New insights into the optical control of macroscopic polarization in ferroelectric crystals 

    Páez Margarit, David (Universitat Politècnica de Catalunya, 2017-06)
    Trabajo final de grado
    Acceso abierto
  • New strategy to minimize dead-time distortion in DCI-NPC power amplifiers using COE-error injection 

    Resano, Tomas; Sala Caselles, Vicenç; Romeral Martínez, José Luis; Moreno Eguilaz, Juan Manuel (Curran, 2013)
    Texto en actas de congreso
    Acceso restringido por política de la editorial
    The DCI-NPC topology has become one of the best options to optimize energy efficiency in the world of high power and high quality amplifiers. This can use an analog PWM modulator that is sensitive to generate distortion ...
  • Novel readout techniques for nanoelectromechanical resonators 

    Fernández-Tenllado Arribas, José María (Universitat Politècnica de Catalunya, 2017-05)
    Projecte Final de Màster Oficial
    Acceso restringido por decisión del autor
    Realizado en/con:  École polytechnique fédérale de Lausanne
    Nanoelectromechanical resonators have shown outstanding performance in mass sensing and heavy filtering applications due to their exceptional sensitivities and high quality factors, among other characteristics. The ...
  • Nueva plataforma dinamométrica para el análisis y valoración del rendimiento deportivo 

    Sánchez Lacuesta, J.; Comín, M.; Prat, J.; Soler, C.; Dejoz, R.; Peris, J. L.; Hoyos, J.V.; Vera, P. (Sociedad Ibérica de Biomecánica y Biomateriales, 1993)
    Artículo
    Acceso abierto
    Un nuevo modelo de plataforma dinamométrica ha sido desarrollado por el Instituto de Biomecánica de Valencia (IBV) y se han fabricado sus primeros prototipos. Permite la medida de la fuerza de reaccipón tridimensional, en ...
  • Sistema de localització per ultrasons 

    Reales Ferreres, Josep (Universitat Politècnica de Catalunya, 2016-10)
    Proyecto/Trabajo final de carrera
    Acceso restringido por decisión del autor
    The project aims to develop an integral hardware-software system to detect the position of an object in the near zone using a low cost ultra-wave transducer. The project will use a development board from the same author.
  • Spectral learning of general weighted automata via constrained matrix completion 

    Balle Pigem, Borja de; Mohri, Mehryar (2012)
    Comunicación de congreso
    Acceso abierto
    Many tasks in text and speech processing and computational biology require estimating functions mapping strings to real numbers. A broad class of such functions can be defined by weighted automata. Spectral methods based ...
  • Spectral learning of transducers over continuous sequences 

    Recasens, Adria; Quattoni, Ariadna Julieta (2013-01-01)
    Report de recerca
    Acceso abierto
    In this paper we present a spectral algorithm for learning weighted nite state transducers (WFSTs) over paired input-output sequences, where the input is continuous and the output discrete. WFSTs are an important tool for ...
  • Splitting of the ultrasounic beam path in clamp-on ultrasonic flowmeters due to propagation through dispersive materials 

    Millán Blasco, Oliver; Salazar Soler, Jorge; Chávez Domínguez, Juan Antonio; Turó Peroy, Antonio; García Hernández, Miguel J. (Institute of Electrical and Electronics Engineers (IEEE), 2017)
    Texto en actas de congreso
    Acceso restringido por política de la editorial
    This article explains how a multi-frequency ultrasonic beam path is split due to passing through dispersive materials and the implications that it has in flow measurement using a Clamp-on ultrasonic flowmeter. The importance ...
  • The noise performance of a high-speed capacitive-sensor interface based on a relaxation oscillator and a fast counter 

    Gasulla Forner, Manuel; Li, Xiujun; Meijer, Gerard C. M. (Institute of Electrical and Electronics Engineers, 2005-10)
    Artículo
    Acceso abierto
    This paper presents the analysis and experimental results on the noise performances of a capacitive-sensor interface. The interface is able to measure low capacitance values in the order of picofarads and is implemented ...
  • Ultrasonic pulse generation by a piezoelectric transducer at cryogenic temperatures 

    Granados Jiménez, Marta (Universitat Politècnica de Catalunya, 2018-06)
    Trabajo final de grado
    Acceso abierto
    The use of cryogenic liquid propellants such as liquid hydrogen or liquid oxygen has arisen a problem for future space missions. As a result of long storage periods bubbles are formed in propellant tanks due to boil-off. ...
  • Zero-flow offset variation in ultrasonic clamp-on flowmeters due to inhomogeneity and nonlinearity of pipe materials 

    Millán Blasco, Oliver; Salazar Soler, Jorge; Chávez Domínguez, Juan Antonio; Turó Peroy, Antonio; García Hernández, Miguel J. (2017-11)
    Artículo
    Acceso restringido por política de la editorial
    The objective of this paper is to measure the zero-flow offset variation in ultrasonic Clamp-on flowmeters produced by using pipes made of materials with a nonhomogeneous and nonlinear behavior. The evaluation of this ...