Browsing by Author "Šafářová, Veronika"
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- ItemAnomalous electrical resistance of hybrid yarns containing metal fibers(Hong Kong Polytechnic University, 2011) Militký, Jiří; Šafářová, VeronikaThe total electric resistance R is theoretically linearly increasing function of the conductive wire length L, because the electric conductivity K or electric resistivity r is independent on L. It was found [7] that for yarns containing the conductive metal fibres the dependence of electric resistance R on L is highly nonlinear. Main aim of this contribution is creation of the simple mechanistic model describing this anomalous length dependence. Characteristic parameter of this model is so called specific resistivity .
- ItemNumerical and experimental study of the shielding effectiveness of hybrid fabrics(2012) Militký, Jiří; Šafářová, VeronikaThe electromagnetic interference shielding efficiency measurement needs to use special devices and in addition results are dramatically affected by applied measuring method. Measurements of surface or volume resistivity are simpler. It is known from theory that it is possible to measure characteristics of electrical part of electromagnetic field only at sufficiently high frequencies and therefore there should be mathematical relation between total shielding effectiveness SE [dB] and fabric resistivity or conductivity. One of modern application of materials with increased electromagnetic shielding efficiency is not only technical protection, but also protection of human being while operating specific electric equipments. The main aim of this work is investigation of the form of relation between electrical characteristics and total shielding effectiveness SE for special types of fabrics containing extremely thin metal fibers in its structure.