High Voltage Sensors
Mostrando 13-19 de 19 artigos, teses e dissertações.
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13. Monitoramento e diagnÃstico de estado de disjuntores de alta e extra alta tensÃo como tÃcnica de manutenÃÃo preditiva
Concerning to the present rules applied to the energy sector in Brazil, quality of services plays an important part in determining conditions in which better results will be achieved. The Brazilian Electricity Regulatory Agency ANEEL - has imposed severe penalties to the electric companies involving large amount of money in case of equipment failures.
Publicado em: 2004
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14. A silicon-polymer heterostructure for sensor applications
We report the development and characterization of high quality polyaniline-silicon heterojunction diodes appropriated for use as gas and/or ionizing radiation sensors. Polyaniline thin films 40 nm thick are an active part of the junction structure, that presents excellent electrical characteristics, with rectifying ratio of 50,000 at ± 1.0 Volt bias. The de
Brazilian Journal of Physics. Publicado em: 2002-06
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15. Sensor Hall de GaAs por implantação de ions
In this work we designed, fabricated and characterized Hall-effect magnetic sensors. We studied the involved physical principies and figures of merit of sensors (Hali voltage, Sensitivity, Offset voltage, Linearity, Noise and Temperature coefficient) and, then, we designed Hall sensors of different shapes, obtaining devices with different sensitivities. We f
Publicado em: 2000
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16. Ryanodine interferes with charge movement repriming in amphibian skeletal muscle fibers.
Cut twitch muscle fibers mounted in a triple Vaseline-gap chamber were used to study the effects of ryanodine on intramembranous charge movement, and in particular on the repriming of charge 1. Charge 1 repriming was measured either under steady-state conditions or by using a pulse protocol designed to study the time course of repriming. This protocol consis
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17. Closed-channel block of BK potassium channels by bbTBA requires partial activation
Blockade of large-conductance Ca2+-activated K+ (BK) channels by the bulky quaternary ammonium compound, N-(4-[benzoyl]benzyl)-N,N,N-tributylammonium (bbTBA), exhibits features consistent with blockade of both closed and open states. Here, we examine block of closed BK channels by bbTBA and how it may differ from block of open channels. Although our observat
The Rockefeller University Press.
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18. Effects of osmolality and ionic strength on the mechanism of Ca2+ release in skinned skeletal muscle fibres of the toad.
1. The effects of increased osmolality and ionic strength on the mechanism of Ca2+ release were examined in mechanically skinned skeletal muscle fibres of the toad at 23 degrees C. Ca2+ release was induced by depolarizing the transverse tubular (T-) system by ionic substitution. 2. Increasing the osmolality of the 'myoplasmic' solution about four times (to 9
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19. Effect of myoplasmic pH on excitation-contraction coupling in skeletal muscle fibres of the toad.
1. The effect of pH on excitation-contraction coupling in skeletal muscle of the toad was examined using a skinned fibre preparation which gives ready access to the intracellular environment while still allowing stimulation of Ca2+ release by the normal voltage-sensor mechanism. 2. In each fibre, depolarization-induced responses (produced by changing the ion