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In this study, periodic grounded DC trees in cross-linked polyethylene (XLPE) under various DC prestressing times are investigated in the temperature range of 20–80 °C. Space charge behaviors in the samples during DC prestressing are simulated based on the bipolar charge transport model. The results reveal that the DC prestressing time has different effects on the tree growth at different temperatures,...
The aim of this paper was to assess commercially available electrodes used in EEG examination. Electrochemical Impedance Spectroscopy was used to investigate properties of four types of electrodes in different temperatures. Special attention was paid to the usability of electrodes used for registration of slow EEG potentials. Obtained results allowed to compare examined electrodes and to form recommendation...
Sensors based on a conducting polymer, Polypyrrole (PPy), were fabricated to measure physiological variables used in clinical medicine as electrocardiography, impedance plethysmography and body temperature. The fabrication process was also described, which had the advantage of producing disposable or even reusable electrodes. The electrodes were fabricated as membranes or bulk elements according to...
High Q and low TCF are elemental characteristics for SAW resonator, in order to realize high performance filters and duplexers coping with new LTE frequency bands. Authors focus on the acoustic energy confinement in SAW propagation surface and electrical characteristics have been investigated theoretically and experimentally. A new multi-layered structure substrate have realized incredible high performances...
This paper presents for the first time thin-film contour mode resonators (CMR) using Lithium Tantalate (LT). Exploiting the inherent low temperature coefficient of frequency (TCF) of certain acoustic modes in LT, we demonstrate low TCF S0 lamb wave mode CMRs in rotated Y-cut LT thin films. With an electrode configuration using a top interdigitated transducer (IDT) and bottom ground electrode, we fabricated...
Impedance probes, which are well known in geophysical prospection, in particular for ground permittivity investigations, have been successfully transposed to space plasmas. Transmitting and receiving electrodes are used for measuring on open circuit the dynamic impedance of the system at several fixed frequencies over a range that includes characteristic frequencies of the ambient plasma. The measurements...
This article deals with the research of different types of phthalocyanines for humidity detection. Thin layers of various phthalocyanines are exposed to water vapors and then electrical properties of these layers are measured. Potentially suitable materials are deposited on the substrates with interdigital electrodes and subsequently impedance-humidity characteristics are measured. Comparison of these...
A special round robin (RR) algorithm has been developed to equalize nickel metal hydride (NiMH) battery packs using a new selective equalizer. This algorithm detects batteries either at a very low state of charge (SOC) or at an extremely high SOC. In this system, a set of electromechanical relays are connected in a matrix to route boost current to the weaker batteries. The relay switching is controlled...
A mode of electrical injury is outlined that uses impedance blocks connected in a serial circuit, with each type of block being repeated as needed. A simple circuit representation at low voltage consists of two contact-site blocks, two elevated-temperature blocks, and one tissue resistance block. Additional blocks can be added for specific parameters in a given model. A high-voltage model would require...
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