Ara es mostren els items 41-60 de 64

    • Performance of an implantable impedance spectroscopy monitor using ZigBee 

      Bogónez Franco, Francisco; Bayés-Genís, Antoni; Rosell Ferrer, Francisco Javier; Bragós Bardia, Ramon (2010-04-04)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      This paper presents the characterization measurements of an implantable bioimpedance monitor with ZigBee. Such measurements are done over RC networks,performing short and long-term measurements, with and without mismatch ...
    • Phase angle by electrical bioimpedance is a predictive factor of hospitalisation, falls and mortality in patients with cirrhosis 

      Román Abal, Eva; Poca, Maria; Amorós Figueras, Gerard; Rosell Ferrer, Francisco Javier; Gely-Nargeot, Marie-Cristine; Nieto, Juan C.; Vidal Alcorisa, Silvia; Urgell Rull, Eulàlia; Ferrero Gregori, Andreu; Alvarado Tapias, Edilmar; Cuyàs Espí, Berta; Hernández Martínez, Elvira; Santesmases, Rosalia; Guarner, Carlos; Escorsell, Àngels; Soriano, German (Nature, 2021-10-14)
      Article
      Accés obert
      The phase angle is a versatile measurement to assess body composition, frailty and prognosis in patients with chronic diseases. In cirrhosis, patients often present alterations in body composition that are related to adverse ...
    • Physiological conditioning by electric field stimulation promotes cardiomyogenic gene expression in human cardiomyocyte progenitor cells 

      Llucía Valldeperas, Aida; Sánchez Terrones, Benjamin; Soler Botija, Carolina; Gálvez Montón, Carolina; Roura, Santiago; Prat Vidal, Cristina; Perea Gil, Isaac; Rosell Ferrer, Francisco Javier; Bragós Bardia, Ramon; Bayés-Genís, Antoni (2014-08-04)
      Article
      Accés obert
      The optimal cell lineage for cardiac-regeneration approaches remains mysterious. Additionally, electrical stimulation promotes cardiomyogenic differentiation of stimulated cells. Therefore, we hypothesized that electrical ...
    • Propagation of measurement noise through backprojection reconstruction in electrical impedance tomography 

      Frangi Caregnato, Alejandro; Riu Costa, Pere Joan; Rosell Ferrer, Francisco Javier; Viergever, Max A. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2002-06-30)
      Article
      Accés obert
      A framework to analyze the propagation of measurement noise through backprojection reconstruction algorithms in electrical impedance tomography (EIT) is presented. Two measurement noise sources were considered: noise in ...
    • Recognition of fibrotic infarct density by the pattern of local systolic-diastolic myocardial electrical impedance 

      Amoros Figueras, Gerard; Jorge, Esther; García Sánchez, Tomás; Bragós Bardia, Ramon; Rosell Ferrer, Francisco Javier; Cinca Cuscullola, Juan Maria (2016-08-31)
      Article
      Accés obert
      Myocardial electrical impedance is a biophysical property of the heart that is influenced by the intrinsic structural characteristics of the tissue. Therefore, the structural derangements elicited in a chronic myocardial ...
    • Reduction of motion artifacts using a two-frequency impedance plethysmograph and adaptative filtering 

      Rosell Ferrer, Francisco Javier; Cohen, Kevin P.; Webster, John G. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1995-10-01)
      Article
      Accés obert
      We measured transthoracic impedance in nine presumed healthy adult subjects with a two-frequency plethysmograph at 57 kHz and 185 kHz. The measurement protocol included periods of normal breathing without motion and periods ...
    • Reference values of the bioimpedance vector components in a Caribbean population 

      Nescolarde Selva, Lexa Digna; Núñez, Ana; Bogónez Franco, Francisco; Lara, Alcibiades; Vaillant, Guillermo; Morales, Ricardo; Rosell Ferrer, Francisco Javier (Elsevier, 2013-06-06)
      Article
      Accés obert
      Background & aims Application of bioelectrical impedance vector analysis (BIVA) requires comparison of an impedance vector to reference intervals derived from healthy subjects. The aim of this work is to obtain reference ...
    • Return-to-play according to GAP in muscle injuries by L-BIA measurements: clinical prognosis. 

      Nescolarde Selva, Lexa Digna; Yanguas Leyes, Javier; Terricabras, Joaquim; Lukaski, Henry; Alomar, Xavier; Rosell Ferrer, Francisco Javier; Rodas Font, Gil (2017)
      Comunicació de congrés
      Accés obert
    • Signal-to-motion artifact ratio versus frequency for impedance pneumography 

      Rosell Ferrer, Francisco Javier; Webster, John G. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1995-03-01)
      Article
      Accés obert
      We measured transthoracic impedance between 12.5 and 185 kHz in nine adults. We used a system with two impedance channels, both simultaneously detecting the real part of impedance at two different frequencies. We used only ...
    • Simulation of a magnetic induction method for determining passive electrical property changes of human trunk due to vital activities 

      Mahdavi, Hadiseh; Rosell Ferrer, Francisco Javier (2012)
      Text en actes de congrés
      Accés obert
      Determining the changes in passive electrical properties of human tissues and the geometry changes of the body parts due to breathing and cardiac activity could be a method for monitoring these vital signs. We have designed ...
    • Simulation of a magnetic induction method for determining passive electrical property changes of human trunk due to vital activities 

      Mahdavi, Hadiseh; Rosell Ferrer, Francisco Javier (2012)
      Comunicació de congrés
      Accés obert
    • Sistemas de instrumentación 

      Riu Costa, Pere Joan; Rosell Ferrer, Francisco Javier; Ramos Castro, Juan José (Edicions UPC, 1995)
      Llibre
      Accés restringit a la comunitat UPC
      El núcleo de la obra contiene la descripción de los protocolos físicos y lógicos necesarios para construir un sistema de instrumentación a base de dispositivos comerciales, conectados con un bus IEEE-488 o VXI. Se describen ...
    • Sistemas de test automático : curso de laboratorio 

      Fernández Chimeno, Mireya; García González, Miguel Ángel; Ramos Castro, Juan José; Riu Costa, Pere Joan; Rosell Ferrer, Francisco Javier (Edicions UPC, 1999)
      Llibre
      Accés restringit a la comunitat UPC
      Este libro es un curso de laboratorio formado por 9 prácticas, mediante las cuales se pretende conseguir tres objetivos: Dar conocer a los estudiantes de electrónica una herramienta real y de amplia aceptación industrial ...
    • Skin impedance from 1 Hz to 1 MHz 

      Rosell Ferrer, Francisco Javier; Colominas i Balagué, Josep; Riu Costa, Pere Joan; Pallàs-Areny, Ramon; Webster, John G. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1988-08-01)
      Article
      Accés obert
      We measured the impedance of skin coated with gel, but otherwise unprepared from 1 Hz to 1 MHz at ten sites on the thorax, leg, and forehead of ten subjects. For a 1 cm2 area, the 1 Hz impedance varied from 10 kΩ to 1 MΩ, ...
    • The effect of respiration-induced heart movements on the ECG 

      Pallàs-Areny, Ramon; Colominas i Balagué, Josep; Rosell Ferrer, Francisco Javier (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1989-06-01)
      Article
      Accés obert
      We present a model describing the rotation of the cardiac vector as a possible mechanism resulting in the presence of respiratory information in the ECG. The way in which this information is revealed is analyzed and the ...
    • The feasibility of transoesophageal bioimpedance measurements for the detection of heart graft rejection 

      Giovinazzo, Giuseppe; Ribas, Núria; Cinca, J.; Rosell Ferrer, Francisco Javier (IOP PUBLISHING LTD, 2011-07)
      Article
      Accés restringit per política de l'editorial
      Previous studies demonstrate that it is possible to evaluate a heart graft rejection condition using a bioimpedance technique by means of an intracavitary catheter. We propose to use a less invasive technique consisting ...
    • The help4mood wearable sensor network for inconspicuous activity measurement 

      Pérez Díaz de Cerio, David; Ruiz Boqué, Sílvia; Rosell Ferrer, Francisco Javier; Ramos Castro, Juan José; Valenzuela González, José Luis; Colomé Castellví, Josep Maria (2013-08)
      Article
      Accés restringit per política de l'editorial
      The Help4Mood EU FP7 project (H4M) [1] proposes to significantly advance the state-ofthe-art in computerized support for people with Major Depression by monitoring mood, physical activity and voice characteristics while ...
    • Total body water changes using segmental bioimpedance in healthy population with similar anthropometry 

      Rosell Ferrer, Francisco Javier; Nescolarde Selva, Lexa Digna; Elvira, J. (Springer Verlag, 2009)
      Comunicació de congrés
      Accés obert
      Electrical bioimpedance was measured in 7 body segments, and also with the standard right-side method, using 11 electrodes at 6 different frequencies in 8 healthy male subjects with similar anthropometry. Our objective was ...
    • Transmural versus non-transmural in situ electrical impedance spectrum for healthy, ischemic, and healed myocardium 

      Salazar, Yolocuauhtli; Bragós Bardia, Ramon; Casas Piedrafita, Óscar; Cinca, Juan; Rosell Ferrer, Francisco Javier (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2004-08-31)
      Article
      Accés obert
      Electrical properties of myocardial tissue are anisotropic due to the complex structure of the myocardial fiber orientation and the distribution of gap junctions. For this reason, measured myocardial impedance may differ ...
    • Transoesophageal detection of heart graft rejection by electrical impedance: using Finite Element Method simulations 

      Giovinazzo, Giuseppe; Ribas, N.; Cinca, J.; Rosell Ferrer, Francisco Javier (2010)
      Text en actes de congrés
      Accés obert
      Previous studies have shown that it is possible to evaluate heart graft rejection level using a bioimpedance technique by means of an intracavitary catheter. However, this technique does not present relevant advantages ...