Electrical Measurements
Mostrando 1-12 de 425 artigos, teses e dissertações.
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1. Safety and Results of Bioelectrical Impedance Analysis in Patients with Cardiac Implantable Electronic Devices
Abstract Objective: To analyze the dual interference between cardiac implantable electronic devices (CIEDs) and bioelectrical impedance analysis (BIA). Methods: Forty-three individuals admitted for CIEDs implantation were submitted to a tetrapolar BIA with an alternating current at 800 microA and 50 kHz frequency before and after the devices’ implantati
Braz. J. Cardiovasc. Surg.. Publicado em: 2020-04
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2. Repeated geophysical measurements in dry and wet soil conditions to describe soil water content variability
ABSTRACT: There is an increasing interest in the application of geophysical surveys to assess the soil water content (SWC) variation in both spatial and temporal scales. In this work, a geophysical survey was carried out at an experimental farm in dry and wet conditions. We determined the SWC data measured with the gravimetric method, apparent electrical con
Sci. agric. (Piracicaba, Braz.). Publicado em: 20/12/2019
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3. Study of Structural and Electric Properties of the PZT 52/48 Doped With Er+3
The scientific community has shown a growing interest in relating to the ferroelectric materials and it has made an effort to develop them. Among these several ferroelectric materials, we proposed to investigated Pb(ZrTi)O3 doped with distinct Er+3 concentrations. Our aim was to investigate how the erbium affects the PZT electrical properties. To determine t
Mat. Res.. Publicado em: 25/11/2019
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4. Safety and Results of Bioelectrical Impedance Analysis in Patients with Cardiac Implantable Electronic Devices
Abstract Objective: To analyze the dual interference between cardiac implantable electronic devices (CIEDs) and bioelectrical impedance analysis (BIA). Methods: Forty-three individuals admitted for CIEDs implantation were submitted to a tetrapolar BIA with an alternating current at 800 microA and 50 kHz frequency before and after the devices’ implantati
Braz. J. Cardiovasc. Surg.. Publicado em: 07/11/2019
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5. Single-Bus and Dual-Bus Architectures of Electrical Power Systems for Small Spacecraft
ABSTRACT Nowadays, it has become possible for universities and new businesses to launch satellites of reduced size and cost fulfilling viable missions. Nevertheless, there is still a considerable failure rate that reduces the expected lifetime of these spacecraft. One of the main causes of failure is the power system. Redundancy is one of the main options to
J. Aerosp. Technol. Manag.. Publicado em: 10/10/2019
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6. Phytoplankton, Trophic State and Ecological Potential in reservoirs in the State of São Paulo, Brazil
Resumo O objetivo deste trabalho foi estabelecer Potencial Ecológico de alguns reservatórios do estado de São Paulo, tendo como elemento de qualidade biológica o fitoplâncton. Amostras de água integrando a coluna d’água foram tomadas nas zonas lótica, central e de barragem dos reservatórios Igaratá, Atibainha, Paiva Castro, Rio Grande, Itupararan
Rev. Ambient. Água. Publicado em: 10/10/2019
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7. Investigation on Electrical Properties and Microdefects of Nb5+-Doped BaTiO3 Based Ceramics by Positron Annihilation Techniques
The influence of the Nb5+-doped content and the doping CaCO3 on the electrical properties and the microdefects of BSTN ceramics by Positron Annihilation Techniques were studied, which were fired at 1350 ºC for 2 hours in air. The PTCR characteristics in the BSTN samples were also investigated. Moreover, the information on microdefects in BSTN ceramics was d
Mat. Res.. Publicado em: 23/09/2019
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8. Nitretação por descargas elétricas da liga Ti-6Al-4V com adição de pó abrasivo SiC ao fluido dielétrico
RESUMO O processo de nitretação que usa Usinagem por Descargas Elétricas é um método que associa a capacidade de usinar superfícies complexas com a obtenção de tratamento termoquímico de nitretação. A fonte de nitrogênio é proveniente da uréia, que compõe o fluido dielétrico juntamente com água deionizada. A liga de titânio Ti-6Al-4V possui
Matéria (Rio J.). Publicado em: 16/09/2019
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9. EFFECTS OF SIZE AND SAMPLING GRID ON THE QUALITY OF APPARENT SOIL ELECTRICAL CONDUCTIVITY MAPS
ABSTRACT The apparent soil electrical conductivity (ECa) is an attribute commonly used for the characterization of the spatial variability of soil, but its determination by handheld sensors consumes considerable time and labor. The reduction in the number of sampling points allows minimize them but can result in increased uncertainty of interpolated maps. Th
Eng. Agríc.. Publicado em: 09/09/2019
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10. Measuring Heart Rate During Exercise: From Artery Palpation to Monitors and Apps
Abstract The use of technology has increased tremendously, by means of more reliable, smaller, more accessible and specially more user-friendly devices, which provide a wider range of features, and promote significant benefits for the population and health professionals. It is in this context that monitors and apps for heart rate (HR) measurement have emerge
Int. J. Cardiovasc. Sci.. Publicado em: 12/08/2019
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11. USE OF GROUND PENETRATING RADAR TO STUDY SPATIAL VARIABILITY AND SOIL STRATIGRAPHY
ABSTRACT Ground Penetrating Radar (GPR) is a geophysical method that uses electromagnetic waves to study subsurface structure in different fields such as geology, agriculture and civil engineering. The wave penetration in the soil is strongly controlled by the electrical conductivity of soil components such as clay, organic matter, and water. In this study,
Eng. Agríc.. Publicado em: 19/06/2019
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12. Microstructure evolution during the extrusion of a 6351 aluminum alloy tube
Abstract The aluminum alloy AA 6351 is a precipitation hardened alloy of the Al-Mg-Si system, additionally containing Mn and Fe. In this study, the microstructural characterization during processing of a thick wall extruded AA 6351 tube was carried out. Several complementary techniques for microstructural characterization were used, such as polarized light o
REM, Int. Eng. J.. Publicado em: 19/06/2019