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Ara es mostren els items 49-68 de 99

    • Heart rate variability analysis using a seismocardiogram signal 

      Ramos Castro, Juan José; Moreno, J.; Miranda-Vidal, H.; García González, Miguel Ángel; Fernández Chimeno, Mireya; Rodas, G.; Capdevila, L. (IEEE, 2012)
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      Seismocardiography is a simple and non invasive method of recording cardiac activity fro m the movements of the body caused by heart pumping. In this preliminary study we use a smartphone to record this acceleration and ...

    • Help4Mood: testing and achievements of the first wireless sensor network prototype 

      Pérez Díaz de Cerio, David; Ruiz Boqué, Sílvia; Rosell Ferrer, Francisco Javier; Ramos Castro, Juan José; Colomé Castellví, Josep Maria (2012)
      Text en actes de congrés
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      Help4Mood is a closed loop approach supporting the control, communication and treatment management of patients with Major Depression. The first out of the three main components of the Help4Mood solution is the Personal ...

    • HRV based Health&Sport markers using video from the face 

      Capdevila, Ll.; Moreno, Jordi; Movellan, Javier; Parrado Romero, Eva; Ramos Castro, Juan José (IEEE, 2012)
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      Heart Rate Variability (HRV) is an indicator of health status in the general population and of adaptatio n to stress in athletes. In this paper we compare the performance of two systems to measure HRV: (1) A commerc ...

    • Improvement of the actimetry agreement among sites by proper choice of signal processing stages 

      García González, Miguel Ángel; Giovinazzo, Giuseppe; Gomez Bule, Rafael; Landi, Francesca; Ramos Castro, Juan José; Rosell Ferrer, Francisco Javier (2012)
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      Physical activity (PA) has been identified as a key health indicator and has been assessed in multiple studies as the study of cardiovascular diseases, diabetes mellitus, obesity and psychological conditions. For this ...

    • In-flight Diagnostics in LISA Pathfinder 

      Lobo Gutiérrez, José Alberto; Nofrarías, M.; Ramos Castro, Juan José; Sanjuan, J.; Conchillo, A; Ortega, J.A.; Xirgu, X; Araujo, H.; Boatella, C.; Chmeissani, M.; Grimani, C.; Puigdengoles, C.; Wass, P.; García-Berro Montilla, Enrique; García, S.; Martínez, L.M.; Montero, G. (American Institute of Physics, 2006-12)
      Text en actes de congrés
      Accés obert
      LISA PathFinder (LPF) will be flown with the objective to test in space key technologies for LISA. However its sensitivity goals are, for good reason, one order of magnitude less than those which LISA will have to meet, ...

    • Interpolation of the magnetic field at the test masses in eLISA 

      Mateos, I.; Díaz Aguiló, Marc; Ramos Castro, Juan José; García-Berro Montilla, Enrique; Lobo, J.A. (2015-08-20)
      Article
      Accés obert
      A feasible design for a magnetic diagnostics subsystem for eLISA will be based on that of its precursor mission, LISA Pathfinder. Previous experience indicates that magnetic field estimation at the positions of the test ...

    • LISA pathfinder micronewton cold gas thrusters: in-flight characterization 

      Armano, M.; Audley, H.; Baird, J.; Binetruy, P.; Born, M.; Bortoluzzi, D.; Ramos Castro, Juan José (American Physical Society (APS), 2019-06-28)
      Article
      Accés obert
      The LISA Pathfinder (LPF) mission has demonstrated the ability to limit and measure the fluctuations in acceleration between two free falling test masses down to sub-femto-g levels. One of the key elements to achieve such ...

    • LISA pathfinder performance confirmed in an open-loop configuration: results from the free-fall actuation mode 

      Armano, M.; Audley, H.; Baird, J.; Binetruy, P.; Born, M.; Bortoluzzi, D.; Ramos Castro, Juan José (American Institute of Physics (AIP), 2019-09-11)
      Article
      Accés obert
      We report on the results of the LISA Pathfinder (LPF) free-fall mode experiment, in which the control force needed to compensate the quasistatic differential force acting on two test masses is applied intermittently as a ...

    • LISA Pathfinder platform stability and drag-free performance 

      Armano, M.; Audley, H.; Baird, J.; Binetruy, P.; Born, M.; Bortoluzzi, D.; Ramos Castro, Juan José (American Physical Society (APS), 2019-04-15)
      Article
      Accés obert
      The science operations of the LISA Pathfinder mission have demonstrated the feasibility of sub-femto-g free fall of macroscopic test masses necessary to build a gravitational wave observatory in space such as LISA. While ...

    • Low-frequency noise characterization of a magnetic field monitoring system using an anisotropic magnetoresistance 

      Mateos, Ignacio; Ramos Castro, Juan José; Lobo, J.A. (2015-11-01)
      Article
      Accés obert
      A detailed study about magnetic sensing techniques based on anisotropic magnetoresistive sensors shows that the technology is suitable for low-frequency space applications like the eLISA mission. Low noise magnetic ...

    • Measuring the galactic cosmic ray flux with the LISA Pathfinder radiation monitor 

      Armano, M.; Audley, H.; Baird, J.; Ramos Castro, Juan José (2018-01-31)
      Article
      Accés obert
      Test mass charging caused by cosmic rays will be a significant source of acceleration noise for space-based gravitational wave detectors like LISA. Operating between December 2015 and July 2017, the technology demonstration ...

    • MEMS miniaturized low-noise magnetic field sensor for the observation of sub-millihertz magnetic fluctuations in space exploration 

      Manyosa i Vilardell, Xavier; Roma Dollase, David; Arqué, M.; Bonastre Majoral, Biel; Jiménez Serres, Vicente; Ramos Castro, Juan José; Pons Nin, Joan; Martín Hernández, Víctor; Salvans Tort, Josep; Gómez, Susan F.; Domínguez Pumar, Manuel (Elsevier, 2024-05-15)
      Article
      Accés obert
      The objective of this paper is to show that, using magnetic field modulation with a MEMS resonator, it is possible to reduce the noise floor of a commercial Tunneling Magnetic Resistance by one order of magnitude, in the ...

    • Micrometeoroid events in LISA Pathfinder 

      Thorpe, J. I.; Slutsky, J.; Baker, John G.; Ramos Castro, Juan José (Institute of Physics (IOP), 2019-09-20)
      Article
      Accés obert
      The zodiacal dust complex, a population of dust and small particles that pervades the solar system, provides important insight into the formation and dynamics of planets, comets, asteroids, and other bodies. We present a ...

    • Mixing design, management and engineering students in challenge-based projects 

      Hassi, Lotta; Ramos Castro, Juan José; Leveratto, Luciana; Juhani Kurikka, Joona; Charosky Larrieu-Let, Guido; Utriainen, Tuuli Maria; Bragós Bardia, Ramon; Nordberg, Markus (2016)
      Comunicació de congrés
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      The aim of this work is to describe and discuss the benefits and limitations that have been detected along two iterations of a learning experience that has been carried out by three institutions located in Barcelona: ...

    • Monitoring drivers' ventilation using an electrical bioimpedance systems: tests in a controlled enviornment 

      Macías Macías, Raúl; García González, Miguel Ángel; Ramos Castro, Juan José; Bragós Bardia, Ramon; Fernández Chimeno, Mireya (Springer Berlin Heidelberg, 2014-11-02)
      Capítol de llibre
      Accés restringit per política de l'editorial
      As improving road safety is one of the first aims in the automotive world, several new techniques and methods are being researched in recent years. Some of them consist of monitoring the driver behavior to detect ...

    • New indices for quantification of the power spectrum of heart rate variability time series without the need of any frequency band definition 

      Ramos Castro, Juan José; Padullés, M.; Marina, M.; Bescós, R.; Iglesias, X.; Rodriguez, F. A.; García González, Miguel Ángel; Fernández Chimeno, Mireya; Ferrer, J.; Escorihuela, R.M.; Parrado Romero, Eva; Capdevila, L.; Benitez, A.; Angulo, R. (IOP PUBLISHING LTD, 2011-06-07)
      Article
      Accés restringit per política de l'editorial
      This paper presents a new family of indices for the frequency domain analysis of heart rate variability time series that do not need any frequency band definition. After proper detrending of the time series, a cumulated ...

    • Noise characterization of an atomic magnetometer at sub-millihertz frequencies 

      Mateos, I.; Patton, B; Zhivun, E; Budker, D; Wurm, D; Ramos Castro, Juan José (2015-04-01)
      Article
      Accés obert
      Noise measurements have been carried out in the LISA bandwidth (0.1-100 mHz) to characterize an all-optical atomic magnetometer based on nonlinear magneto-optical rotation. This was done in order to assess if the technology ...

    • Novel indices of ventricular repolarization to screen post myocardial infarction patients 

      Alvarado Serrano, Carlos; Ramos Castro, Juan José; Pallàs-Areny, Ramon (Elsevier, 2006-05)
      Article
      Accés obert
      We propose novel indices of ventricular repolarization intervals, the JTp/JT, Tpe/JTp and Tpe/JT ratios. These indices have been compared with the duration of the ventricular repolarization intervals and other ratios in ...

    • Novel methods to measure the gravitational constant in space 

      Armano, M.; Audley, H.; Baird, J.; Binetruy, P.; Born, M.; Bortoluzzi, D.; Ramos Castro, Juan José (American Physical Society (APS), 2019-09-20)
      Article
      Accés obert
      We present two novel methods, tested by LISA Pathfinder, to measure the gravitational constant G for the first time in space. Experiment 1 uses electrostatic suspension forces to measure a change in acceleration of a test ...

    • Obtención empírica del límite frecuencial entre las bandas de baja y altra frecuencia en análisis de variabilidad del ritmo cardíaco: aplicación en ratas y humanos 

      García González, Miguel Ángel; Fernández Chimeno, Mireya; Escorihuela, R.M.; Capdevila, Ll.; Ramos Castro, Juan José (2009-11)
      Text en actes de congrés
      Accés obert
      Se propone un nuevo método para la determinación empírica de los límites entre las bandas de baja frecuencia y alta frecuencia del espectro de potencia de las series RR en los estudios de variabilidad del ritmo cardíaco. ...