Number of found documents: 466
Published from to

Surface acoustic waves in the layered systems
Tarasenko, Alexander; Boháč, Petr; Jastrabík, Lubomír
2016 - English
The laser acoustic method was used for analysis of two layered systems: thin titanium and diamond like carbon films both deposited on silicon. The film and substrate parameters are determined by fitting the theoretical curve to the measured dispersion curve. The fit software seeks that set of the system parameters whose theoretical curve coincides the best with the experimental data. For the titanium film the best root-mean square deviation was 2.04 m/s with the relative error < O.I % and for the DLC system the corresponding value was 0.30 m/s (the relative error < O.O1 % ). Keywords: laser acoustic method; surface acoustic waves; layered systems; Ti films; diamond-like carbon films Available at various institutes of the ASCR
Surface acoustic waves in the layered systems

The laser acoustic method was used for analysis of two layered systems: thin titanium and diamond like carbon films both deposited on silicon. The film and substrate parameters are determined by ...

Tarasenko, Alexander; Boháč, Petr; Jastrabík, Lubomír
Fyzikální ústav, 2016

Příprava vzorků
Kopeček, Jaromír
2016 - Czech
Základní shrnutí metalografických a materiálografických postupů a technik pro přípravu vzorků pro mikrosvazkovou analýzu v SEM a příbuzné techniky. The basic summyry of metallography and materialography as it is exploited for SEM samples´ preparation and connected techniques. Keywords: SEM; metallography Available at various institutes of the ASCR
Příprava vzorků

Základní shrnutí metalografických a materiálografických postupů a technik pro přípravu vzorků pro mikrosvazkovou analýzu v SEM a příbuzné techniky....

Kopeček, Jaromír
Fyzikální ústav, 2016

Difrakce zpět rozptýlených elektronů
Kopeček, Jaromír
2016 - Czech
Nástin metody EBSD dokumentující použitelnost metody, typické úkoly a aplikace. Outline of the EBSD method, its use, tasks and typical applications. Keywords: EBSD method; SEM; microstructure Available at various institutes of the ASCR
Difrakce zpět rozptýlených elektronů

Nástin metody EBSD dokumentující použitelnost metody, typické úkoly a aplikace.


Outline of the EBSD method, its use, tasks and typical applications.

Kopeček, Jaromír
Fyzikální ústav, 2016

Book of Abstracts of the 26th Joint Seminar Development of Materials Science in Research and Education
Kožíšek, Zdeněk; Král, Robert; Zemenová, Petra
2016 - English
Topics:\n- Trends in development of materials research\n- Education of materials science at the universities\n- Information about the research programmes of individual institutions\n- Information on equipment for preparation and characterisation of materials\n- Results of materials science research Keywords: material sciences Available at various institutes of the ASCR
Book of Abstracts of the 26th Joint Seminar Development of Materials Science in Research and Education

Topics:\n- Trends in development of materials research\n- Education of materials science at the universities\n- Information about the research programmes of individual institutions\n- Information on ...

Kožíšek, Zdeněk; Král, Robert; Zemenová, Petra
Fyzikální ústav, 2016

Aproximace Fourierových koeficientů difrakčních profilů
Čerňanský, Marian
2016 - Czech
Approximations in the Warren-Averbach interpretation of Fourier coeeficients of diffraction profiles are briefly summarized. It is shown, that certain approximations of a course of Fourier coefficients enable estimate of crystallite size and microstrain only from a single diffraction line.\n Keywords: line profile analysis; Fourier coefficients; crystallite size; microstrain Available at various institutes of the ASCR
Aproximace Fourierových koeficientů difrakčních profilů

Approximations in the Warren-Averbach interpretation of Fourier coeeficients of diffraction profiles are briefly summarized. It is shown, that certain approximations of a course of Fourier ...

Čerňanský, Marian
Fyzikální ústav, 2016

Thermocouples
Kopeček, Jaromír
2015 - English
Analsis of different samples of thermocouples before and after laser marking what is used to produce barcode close to spike of the probes. The aim is to investigate the influence of laser marking by detailed analysis of the material structure of the samples. Keywords: laser marking; thermocouple; analysis; inconel Available at various institutes of the ASCR
Thermocouples

Analsis of different samples of thermocouples before and after laser marking what is used to produce barcode close to spike of the probes. The aim is to investigate the influence of laser marking by ...

Kopeček, Jaromír
Fyzikální ústav, 2015

Diamond coated AlGaN/GaN high electron mobility transistors - effect of deposition process on gate electrode
Vanko, G.; Ižák, Tibor; Babchenko, O.; Kromka, Alexander
2015 - English
We studied the influence of the diamond deposition on the degradation of Schottky gate electrodes (i.e. Ir or IrO2) and on the electrical characteristics of AlGaN/GaN high electron mobility transistors (HEMTs). In present study, the diamond films were selectively deposited on the AlGaN/GaN circular HEMT by focused (ellispoidal cavity reactor) and linear antenna (surface wave) microwave plasma at different temperatures from 400°C to 1100°C. The preliminary results on electrical measurements on the diamond-coated c-HEMTs showed degraded electrical properties comparing to c-HEMTs before deposition process, which was attributed to degradation of the Ir gate electrodes even at temperatures as low as 400°C. On the other hand, metal oxide gate electrode layer (IrO2) can withstand diamond CVD process even at high temperatures (~900°C) which make it suitable for fabrication of all-in-diamond c-HEMT devices for high-power applications. Keywords: GaN HEMT; CVD diamond; iridium oxide; thermal stability; IV characteristics Available at various institutes of the ASCR
Diamond coated AlGaN/GaN high electron mobility transistors - effect of deposition process on gate electrode

We studied the influence of the diamond deposition on the degradation of Schottky gate electrodes (i.e. Ir or IrO2) and on the electrical characteristics of AlGaN/GaN high electron mobility ...

Vanko, G.; Ižák, Tibor; Babchenko, O.; Kromka, Alexander
Fyzikální ústav, 2015

Magnetic domains under mechanical stress in single crystal Ni-Mn-Ga
Kopecký, Vít; Heczko, Oleg
2015 - English
The complexity of Ni-Mn-Ga single crystal lies in combination of ferromagnetic domain structure and ferroelastic twinned microstructure. Magnetic domain structure for different twinned microstructure was studied using magneto-optical indicator film. Different orientations of magnetic domains can be observed at the same place of the sample thanks to magnetically induced structural reorientation by movement of twin boundaries. We investigated experimentally the changes of magnetic domain structure in the vicinity of mobile a/c twin boundary. Keywords: Ni-Mn-Ga; magnetic domains; twin boundary Available at various institutes of the ASCR
Magnetic domains under mechanical stress in single crystal Ni-Mn-Ga

The complexity of Ni-Mn-Ga single crystal lies in combination of ferromagnetic domain structure and ferroelastic twinned microstructure. Magnetic domain structure for different twinned ...

Kopecký, Vít; Heczko, Oleg
Fyzikální ústav, 2015

Labio, a.s. – studie možností rozšíření plynového chromatografu
Divoký, Martin
2015 - Czech
Projekt byl zaměřen na testování a vývoj UV plynového chromatografu Labio G11. Spektrometr chromatografu byl modifikován, aby došlo k rychlejšímu propláchnutí vnitřního prostoru dusíkem (neabsorbuje v UV) a byla uspíšena připravenost k provozu. Dále byla otestována citlivost spektrometru v UV pod 150 nm a navrženy možnosti rozšíření citlivosti v této oblasti. This project aimed at testing and development of a UV gas chromatograph Labio G11. A spectrometer from the chromatograph was modified in order to increase nitrogen gas flow in the device and speed at which the inner of the spectrometer is filled with nitrogen (that doesn’t absorb in UV). This allowed decreasing startup time of the spectrometer. Additionally, sensitivity of the spectrometer in region below 150 nm was tested and ways to increase this sensitivity were proposed. Keywords: UV detection; UV absorption; gas flow; gas mixing Available at various institutes of the ASCR
Labio, a.s. – studie možností rozšíření plynového chromatografu

Projekt byl zaměřen na testování a vývoj UV plynového chromatografu Labio G11. Spektrometr chromatografu byl modifikován, aby došlo k rychlejšímu propláchnutí vnitřního prostoru dusíkem (neabsorbuje v ...

Divoký, Martin
Fyzikální ústav, 2015

Investigation of thermal depolarization in high-power TGG ceramic rods
Lucianetti, Antonio
2015 - English
Wavefront deformation and thermal stress birefringence were evaluated for high-power TGG ceramic rods. The real laser beam profile used to heat the TGG ceramics was considered in the calculations. The numerical model was bench-marked with experimental data at about 100 W and then used to study the scalability of a similar TGG-based optical isolator up to 1 kW average power. Keywords: thermal modeling; optical isolation; birefringence Available at various institutes of the ASCR
Investigation of thermal depolarization in high-power TGG ceramic rods

Wavefront deformation and thermal stress birefringence were evaluated for high-power TGG ceramic rods. The real laser beam profile used to heat the TGG ceramics was considered in the calculations. The ...

Lucianetti, Antonio
Fyzikální ústav, 2015

About project

NRGL provides central access to information on grey literature produced in the Czech Republic in the fields of science, research and education. You can find more information about grey literature and NRGL at service web

Send your suggestions and comments to nusl@techlib.cz

Provider

http://www.techlib.cz

Facebook

Other bases