Browsing Ústav fyziky by Author "Chobola, Zdeněk"
Now showing items 1-6 of 6
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Acoustic non-destructive testing of high temperature degraded concrete with comparison of acoustic impedance
Dvořák, Richard; Chobola, Zdeněk; Kusák, Ivo (MATEC Web of Conferences, 2018-10-30)The paper is focused on non-destructive measurement of high temperature degraded concrete test specimens of three mixtures different by the use of coarse aggregate. Testing is done by ultrasonicpulse velocitymethod and ... -
Carbon admixtures influence on the electrical properties of slag mortars focusing on alternating conductivity and permittivity
Luňák, Miroslav; Kusák, Ivo; Chobola, Zdeněk (Elsevier, 2016-08-01)New materials based on alkali-activated slag mortars may be an important contribution of applied research, which strives to offer the use of waste materials as a full replacement for the currently used binders and explores ... -
Classification of Thermally Degraded Concrete by Acoustic Resonance Method and Image Analysis via Machine Learning
Dvořák, Richard; Chobola, Zdeněk; Plšková, Iveta; Hela, Rudolf; Bodnárová, Lenka (MDPI, 2023-01-22)The study of the resistance of plain concrete to high temperatures is a current topic across the field of civil engineering diagnostics. It is a type of damage that affects all components in a complex way, and there are ... -
Flexure response of thermal loaded concrete specimens by acoustic emission method
Pazdera, Luboš; Topolář, Libor; Mikulášek, Karel; Smutný, Jaroslav; Hoduláková, Michaela; Chobola, Zdeněk; Seelmann, Herbert (EDP Sciences – Web of Conferences, 2017-05-24)The response to fire of concrete structural members depends on the thermal, mechanical, and deformation properties of concrete. These properties vary significantly with temperature depending on the composition and ... -
Low-frequency noise measurements used for quality assessment of GaSb based laser diodes prepared by molecular beam epitaxy
Chobola, Zdeněk; Luňák, Miroslav; Vaněk, Jiří; Hulicius, Eduard; Kusák, Ivo (Faculty of Electrical Engineering and Information Technology of the Slovak University of Technology, 2015-08-01)The paper reports on a non-destructive method of reliability prediction for semiconductor lasers diodes GaSb based VCSE. Transport and noise characteristic of forward biased were measured in order to evaluate the new MBE ... -
Monitoring of concrete hydration by electrical measurement methods
Kusák, Ivo; Luňák, Miroslav; Chobola, Zdeněk (Elsevier, 2016-08-01)Analysis of impedance spectra of inhomogeneous materials is a part of the impedance spectroscopy which is still waiting for its development. Materials having higher electric resistance values (over 500 kohm) can be considered ...