About: Microstructure and Defects Evaluation of Varistors by Ultrasonic Waves in Low Frequency Range

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About: Microstructure and Defects Evaluation of Varistors by Ultrasonic Waves in Low Frequency Range Goto Sponge NotDistinct Permalink

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Each material contains defects and in-homogeneities in a structure volume. It has influence on the properties of material (conductivity, mass density, mechanical properties). Interaction of the ultrasonic waves with defects or in-homogeneities in the solid state is not clear. Electro-ultrasonic spectroscopy can help to clarify this phenomenon. The electro-ultrasonic spectroscopy describes defects and un-homogeneities inside the sample structure. This method is quite different from electro-acoustic effect. Ultrasonic signal is in range from 20 kHz to 150 kHz. Ultrasonic signal changes geometry of the sample in elastic range only. The sizes of cracks are changing also in the sample volume. Conductivity near the area of cracks is strongly changing due to ultrasonic vibrations. It has influence on resistance of the sample which is changing along with a frequency of ultrasonic vibrations. The amplitude of the resistance change depends on the material, number of cracks, size of cracks and Eigen frequencies Each material contains defects and in-homogeneities in a structure volume. It has influence on the properties of material (conductivity, mass density, mechanical properties). Interaction of the ultrasonic waves with defects or in-homogeneities in the solid state is not clear. Electro-ultrasonic spectroscopy can help to clarify this phenomenon. The electro-ultrasonic spectroscopy describes defects and un-homogeneities inside the sample structure. This method is quite different from electro-acoustic effect. Ultrasonic signal is in range from 20 kHz to 150 kHz. Ultrasonic signal changes geometry of the sample in elastic range only. The sizes of cracks are changing also in the sample volume. Conductivity near the area of cracks is strongly changing due to ultrasonic vibrations. It has influence on resistance of the sample which is changing along with a frequency of ultrasonic vibrations. The amplitude of the resistance change depends on the material, number of cracks, size of cracks and Eigen frequencies (en)
Title	Microstructure and Defects Evaluation of Varistors by Ultrasonic Waves in Low Frequency Range Microstructure and Defects Evaluation of Varistors by Ultrasonic Waves in Low Frequency Range (en)
skos:prefLabel	Microstructure and Defects Evaluation of Varistors by Ultrasonic Waves in Low Frequency Range Microstructure and Defects Evaluation of Varistors by Ultrasonic Waves in Low Frequency Range (en)
skos:notation	RIV/00216305:26220/14:PU111425!RIV15-MSM-26220___
http://linked.open...avai/riv/aktivita	P
http://linked.open...avai/riv/aktivity	P(ED1.1.00/02.0068), P(ED2.1.00/03.0072)
http://linked.open...iv/cisloPeriodika	1
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Tofel, Pavel Škarvada, Pavel Šikula, Josef Cséfalvay, Gabriel
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Vysoké učení technické v Brně / Fakulta elektrotechniky a komunikačních technologií
http://linked.open...dnocenehoVysledku	29245
http://linked.open...ai/riv/idVysledku	RIV/00216305:26220/14:PU111425
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Non-destructive testing, electro-ultrasonic spectroscopy, resistance change, crack geometry change, inhomogeneities (en)
http://linked.open.../riv/klicoveSlovo	electro-ultrasonic spectroscopy inhomogeneities crack geometry change resistance change Non-destructive testing
http://linked.open...odStatuVydavatele	CH - Švýcarská konfederace
http://linked.open...ontrolniKodProRIV	[287E9A38C74E]
http://linked.open...i/riv/nazevZdroje	Key Engineering Materials (print)
http://linked.open...in/vavai/riv/obor	BE
http://linked.open...ichTvurcuVysledku	4 (xsd:int)
http://linked.open...cetTvurcuVysledku	4 (xsd:int)
http://linked.open...vavai/riv/projekt	Central european institute of technology Centre of sensor, information and communication systems
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	465
http://linked.open...iv/tvurceVysledku	Cséfalvay, Gabriel Tofel, Pavel Šikula, Josef Škarvada, Pavel
issn	1013-9826
number of pages	4 (xsd:int)
http://localhost/t...ganizacniJednotka	26220

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