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130 results on '"Čada, M."'

13. Anisotropic Convection Model for the Earth’s Mantle

Author

Mühlhaus, H. -B., Čada, M., Moresi, L., Goos, G., editor, Hartmanis, J., editor, van Leeuwen, J., editor, Sloot, Peter M. A., editor, Abramson, David, editor, Bogdanov, Alexander V., editor, Gorbachev, Yuriy E., editor, Dongarra, Jack J., editor, and Zomaya, Albert Y., editor

Published
2003
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14. In-situ impedance spectroscopy of a plasma-semiconductor thin film system during reactive sputter deposition.

Author

Zanáška, M., Kudrna, P., Čada, M., Tichý, M., and Hubička, Z.

Subjects
SPUTTER deposition, THIN films, REACTIVE sputtering, THIN film deposition, IMPEDANCE spectroscopy, DIELECTRIC films
Abstract

We present a comparatively simple-to-apply in situ diagnostic suitable for determining the dielectric properties of nonconducting and semiconducting thin films during plasma-aided deposition. The method is based on measurement of the impedance spectrum of a system plasma-film within the kilohertz range of frequencies, i.e., without the need of special equipment. Total film capacitance, resistance, and the loss factor tan δ can be estimated in situ from the measured impedance spectra. Provided that the film thickness is known, the dielectric and electrical properties of the deposited films, such as relative permittivity ɛr and conductivity σ, can be estimated as well. The applicability of the developed method is demonstrated on Fe2O3 and TiO2 thin films during deposition in a low-pressure low-temperature plasma-jet system and on a TiO2 thin film during deposition in a planar magnetron system. The experimentally obtained dielectric properties are compared with data from the literature. [ABSTRACT FROM AUTHOR]

Published
2019
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22. Measurement and modeling of plasma parameters in reactive high-power impulse magnetron sputtering of Ti in Ar/O2 mixtures.

Author

Čada, M., Lundin, D., and Hubička, Z.

Subjects
*MAGNETRON sputtering, *PLASMA density, *ELECTRON temperature, *TITANIUM, *ARGON, *OXYGEN, *SPUTTERING (Physics)
Abstract

A reactive high-power impulse magnetron sputtering (HiPIMS) process using a titanium target in a mixture of Ar/O2 has been investigated for different modes of operation including pure argon, metallic, transition, and compound mode. The trends and changes in the plasma density ne and the effective electron temperature Teff, have been measured by the time-resolved Langmuir probe technique. The same experimental process conditions have also been studied using a recently developed reactive ionization region model (R-IRM), making it possible to compare the acquired experimental results with the model results. It was found that trends in the plasma density and mean electron energy as measured by the Langmuir probe are in good agreement with the results obtained from the R-IRM model for different pulse discharge current densities. The effective electron temperature generally increases with an increasing oxygen flow rate. It is likely due to a reduction of sputtered Ti, due to compound formation on the target, which forces the discharge to increase the electron energy to increase the ionization rate of the process gas (Ar/O2) to maintain a high HiPIMS discharge current. Small variations in the plasma density were detected between the middle part of the plasma pulse as compared to the end of the plasma pulse, when transitioning from the metal mode to the poisoned mode. It is found that the time-evolution of the electron density is rather well correlated with the discharge current waveform. On the other hand, the mean electron energy did not change significantly between the middle and the end of the plasma pulse. For the lower pulse discharge current, both the model and experimental data have shown a slight increase in the plasma density with increasing O2 mass flow rate. [ABSTRACT FROM AUTHOR]

Published
2017
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38. Comparison of body composition between two elite women's volleyball teams [Srovnání tělesného složení dvou špičkových ženských volejbalových týmů]

Author

Malý, T., Malá, L., Zahálka, F., Baláš, J., and Čada, M.

Subjects
body fat, elite sport, physical fitness, women, physical conditioning, lcsh:Sports medicine, lcsh:RC1200-1245
Abstract

BACKGROUND: In sport and in top performance sport in particular, the continuous monitoring of body composition (BC) may regulate the training process, affecting positively athletes' top form. BC is, therefore, considered to be one of the components of the physical fitness of athletes. Research studies dealing with BC in women volleyball players are often focused on a lower performance level when compared with the submitted study. The problem in the field of results comparison is with the variety in the methodology used in BC assessment. OBJECTIVE: The objective of our study is to describe the body composition (BC) profile of top performance women volleyball players and verify whether there are differences in the chosen parameters between them. The examined group consists of women volleyball players of two teams which were participants in the European Champions League (T1, n = 12; T2, n = 9). METHODS: By means of multifrequency bioimpedance analysis, we observed Lean Body Mass (LBM), Fat Mass (FM), Body Cell Mass (BCM), relative BCM (BCMrel), ExtraCellular Mass (ECM) and their mutual ratio (of ECM/ BCM), Cell Quote (CQ), phase angle (α), Basal Metabolic Rate (BMR), Total Body Water (TBW) while making a distinction between ExtraCellular (ECW) and IntraCellular (ICW) Water. One-way ANOVA and Cohen's d were used for the comparison of differences between the monitored teams. RESULTS: Differences in the examined parameters of body composition between the screened samples were not statistically significant (p > 0.05). Effect size revealed moderate differences for other parameters (α, ECM, BCM, ECM/ BCM, BMR, FM and CQ). Fat mass percentage in our women players was lower in comparison to values recorded in women players in most other studies. The relatively high values of TBW, LBM and ECM/BCM in women volleyball players of both teams indicate their good performance capacity. CONCLUSIONS: The body composition profile revealed the appropriate predispositions of the observed players for their performance in volleyball. The measured parameters of BC corresponding to top performance sport are better than in high performance sport or in the general population. Our values of BC in elite women volleyball players can serve as standards for other athletes attempting to achieve international level.[VÝCHODISKA: Ve sportu a zvláště ve vrcholovém sportu může průběžné sledování tělesného složení (body composition – BC) přinést pozitivní zhodnocení efektu tréninkového procesu. Úroveň tělesného složení (BC) je proto považována za jednu z komponent tělesné zdatnosti sportovců. Výzkumné studie zabývající se tělesným složením u volejbalistek jsou často zaměřeny na nižší výkonnostní úrovně ve srovnání s předloženou studií. Problémem v oblasti porovnávání výsledků je také odlišnost použité metodiky při stanovení tělesného složení. CÍLE: Cílem studie je popis profilu tělesného složení (BC) hráček volejbalu nejvyšší úrovně a ověření rozdílů vybraných parametrů BC mezi sledovanými skupinami. Výzkumná skupina se skládala z hráček dvou týmů, které se účastnily Evropské ligy mistryň (T1, n = 12; T2, n = 9). METODIKA: Pomocí měření multifrekvenční bioimpedance jsme sledovali tukuprostou hmotu (LBM), tukovou hmotu (FM), tělesnou buněčnou hmotu (BCM), relativní BCM (BCMrel), mimobuněčnou hmotu (ECM) a jejich poměr (ECM/BCM), percentuální zastoupení BCM v LBM (CQ), fázový úhel (α), basální metabolismus (BMR), celkovou tělesnou vodu (TBW) spolu s rozdílem mezi mimobuněčnou (ECW) a buněčnou (ICW) vodou. Pro srovnání rozdílů mezi sledovanými týmy jsme použili One-way ANOVA a velikost efektu jsme posuzovali pomocí indexu Cohenova d. VÝSLEDKY: Rozdíly sledovaných parametrů tělesného složení ve zkoumaném vzorku nebyly signifikantní (p > 0.05). Věcná významnost prokázala středně veliký účinek rozdílu pro některé parametry (α, ECM, BCM, ECM/BCM, BMR, FM a CQ). Tuková hmota byla u sledovaných hráček procentuálně nižší ve srovnání s hráčkami ve většině ostatních studií. Relativně vyšší hodnoty parametrů TBW, LBM a ECM/BCM v kategorii ženských hráček volejbalu ukazují dobrou výkonnostní úroveň. ZÁVĚRY: Profil tělesného složení prokázal vhodné predispozice sledované skupiny pro vrcholový volejbal. Měřené parametry BC korespondují s hodnotami hráček vrcholové úrovně a jsou na lepší úrovni, než jsou hodnoty běžné populace. Námi získané hodnoty parametru BC u hráček volejbalu vrcholové úrovně mohou sloužit jako standardy pro ostatní sportovce nejvyšší výkonnostní úrovně.]

Published
2011

49. Langmuir probe diagnostics of a plasma jet system

Author

Tichý, M, primary, Hubička, Z, additional, Šícha, M, additional, Čada, M, additional, Olejníček, J, additional, Churpita, O, additional, Jastrabík, L, additional, Virostko, P, additional, Adámek, P, additional, Kudrna, P, additional, Leshkov, S, additional, Chichina, M, additional, and Kment, Š, additional

Published
2008
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