Number of found documents: 483
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Micro-Raman analysis of samples irradiated at the FLASH facility in Summer 2014 (Report v1-31_05_2016)
Toufarová, Martina; Hájková, Věra; Chalupský, Jaromír; Juha, Libor
2016 - English
The goal of micro-Raman measurements was to indicate a presence of the carbon black grown in the FEL-illuminated areas on the sample surface. Twelve samples have been investigated and results have been reported to the X-ray Optics Group at the University of Twente. Keywords: radiation damage; carbon black; free-electron laser; soft x-rays; Raman spectroscopy Available at various institutes of the ASCR
Micro-Raman analysis of samples irradiated at the FLASH facility in Summer 2014 (Report v1-31_05_2016)

The goal of micro-Raman measurements was to indicate a presence of the carbon black grown in the FEL-illuminated areas on the sample surface. Twelve samples have been investigated and results have ...

Toufarová, Martina; Hájková, Věra; Chalupský, Jaromír; Juha, Libor
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

Transfer of electrons or holes between localized states. Application to polymer electric conductivity
Král, Karel; Menšík, Miroslav
2016 - English
Basing on the quantum transport formalizm a formula for the irreversible transfer of charged particles has been introduced by us recently. This formula is expected to be suitable for the theoretical description of the electron or hole transfer between quantum dots, other nanoparticles, molecules, and so on. We discuss shortly the main physical properties of the formula. We also demonstrate the use of the formula for the theoretical analysis of the electronic physical properties of some electrically conductive polymers.\n Keywords: electron transfer; electron-phonon interaction; quantum nanostructures; transfer rate formula; polymer conductivity Available at various institutes of the ASCR
Transfer of electrons or holes between localized states. Application to polymer electric conductivity

Basing on the quantum transport formalizm a formula for the irreversible transfer of charged particles has been introduced by us recently. This formula is expected to be suitable for the theoretical ...

Král, Karel; Menšík, Miroslav
Fyzikální ústav, 2016

Geometric resonances in reflectivity spectra of lead zirconate
Dočekalová, Zuzana; Hlinka, Jiří
2016 - English
The paper deals with effects of domain boundaries on the THz–frequency range dispersion of the complex dielectric permitivity tensor of lead zirconate. In the case of a sufficiently narrow domain widths (in comparison to the wave–length of the light used in the experiment), the effective–medium average permittivity shows additional peaks identified as geometric resonances, i.e. extraneous excitations created by thematerial interface. Features of the far–infrared reflectivity spectra of the twinned lead zirconate crystal in the limit of narrow and wide domains are estimated with the\nhelp of the damped harmonic oscillator model with paramaters fully determined fromrecent experiments. Keywords: geometric resonances; lead zirconate; antiferroelectrics; reflectivity; phonon Available at various institutes of the ASCR
Geometric resonances in reflectivity spectra of lead zirconate

The paper deals with effects of domain boundaries on the THz–frequency range dispersion of the complex dielectric permitivity tensor of lead zirconate. In the case of a sufficiently narrow domain ...

Dočekalová, Zuzana; Hlinka, Jiří
Fyzikální ústav, 2016

Cryogenic cooling system Brayton for 10 J/10 Hz Yb:YAG multi-slab based laser system at ELI-Beamlines project
Schustr, P.; Fibrich, Martin; Polan, Jiří; Rus, Bedřich; Dostálová, M.; Valdislav, P.; Simek, J.
2016 - English
We present design and operational prototype of cryogenic cooling system based on Bryton's cycle for 10J/10Hz Yb:YAG multi-slab laser system at ELI-Beamlines project. Keywords: Brayton; cryogenics; laser; cooling; ytterbium; design; prototype Available at various institutes of the ASCR
Cryogenic cooling system Brayton for 10 J/10 Hz Yb:YAG multi-slab based laser system at ELI-Beamlines project

We present design and operational prototype of cryogenic cooling system based on Bryton's cycle for 10J/10Hz Yb:YAG multi-slab laser system at ELI-Beamlines project.

Schustr, P.; Fibrich, Martin; Polan, Jiří; Rus, Bedřich; Dostálová, M.; Valdislav, P.; Simek, J.
Fyzikální ústav, 2016

Plazmatická příprava kovových a oxidových vrstev na keramické a plastové substráty.
Olejníček, Jiří
2016 - Czech
Smluvní výzkum byl zaměřen na přípravu a optimalizaci procesu plazmatické depozice vybraných tenkých vrstev kovů a polovodivých oxidů s požadovanými optickými vlastnostmi. Cílem bylo připravit průhledné barevné electrochromické vrstvy na teplotně citlivé substráty, vrstvy s vysokým indexem lomu na lisované plastové struktury a lesklé kovové vrstvy na porézní keramické masky.\n Contract research was focused on preparation and optimization of the plasma deposition process of selected thin metal and semiconducting oxide layers with required optical properties. The goal was to prepare transparent color electrochromic films on thermally sensitive substrates, the layers with high refractive index on the surface of pressed plastic structures and shiny metallic films on the porous ceramic masks.\n Keywords: magnetron sputtering; thin films; surface properties Available at various institutes of the ASCR
Plazmatická příprava kovových a oxidových vrstev na keramické a plastové substráty.

Smluvní výzkum byl zaměřen na přípravu a optimalizaci procesu plazmatické depozice vybraných tenkých vrstev kovů a polovodivých oxidů s požadovanými optickými vlastnostmi. Cílem bylo připravit ...

Olejníček, Jiří
Fyzikální ústav, 2016

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

Scanning thermal microscopy of thermoelectric pulsed laser deposited nanostructures
Vaniš, Jan; Zelinka, Jiří; Zeipl, Radek; Jelínek, Miroslav; Kocourek, Tomáš; Remsa, Jan; Navrátil, Jiří
2015 - English
New materials with high possible figure of merit ZT are of high interest as a promising candidates for thermoelectric applications such as energy harvesting. Miniaturization of such systems tends toward developing of the suitable characterization method with nanometer resolution ability. In our contribution, we present the development and experimental results of a simple scanning probe microscopy method for the relative thermal conductivity characterization. The possibility of the setup is demonstrated on the set of different thin thermoelectric layers grown from hot pressed targets by pulsed laser deposition on the reference Si substrate. All the measurements were performed on the commercial Veeco Multimode scanning AFM/STM microscope with home developed controller and by using PicoCal Inc. bolometer probes with tungsten resistive path. All the experiments were done in the air at the ambient condition. Additional sample treatment for the measurement will be also briefly described Keywords: Scanning thermal microscopy; figure of merit; thermoeletric materials Available at various institutes of the ASCR
Scanning thermal microscopy of thermoelectric pulsed laser deposited nanostructures

New materials with high possible figure of merit ZT are of high interest as a promising candidates for thermoelectric applications such as energy harvesting. Miniaturization of such systems tends ...

Vaniš, Jan; Zelinka, Jiří; Zeipl, Radek; Jelínek, Miroslav; Kocourek, Tomáš; Remsa, Jan; Navrátil, Jiří
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

BRK Technologies s.r.o. - Laser incineration of toxic medical wastes: towards to 100% safety
Rostohar, Danijela; Bulgakova, Nadezhda M.; Flimelová, Miroslava
2015 - English
The aim of the project is to design, construct and optimize a prototype of a laser incineration chamber (LICh) for treatment of toxic medical wastes. The LICh must provide safe incineration of organic wastes by an intense laser beam generating very high temperature of the incineration process. The LICh and involved technology must be relatively cheap and mobile for easy installation near the medical institutions producing toxic wastes. The most important aspect is the control of incineration products to ensure 100% safety of the gases issuing into atmosphere from the LICh. This is the first step of the whole project with aim to do the state of the art study and propose next steps. Keywords: laser incineration chamber; waste removal; toxic wastes Available at various institutes of the ASCR
BRK Technologies s.r.o. - Laser incineration of toxic medical wastes: towards to 100% safety

The aim of the project is to design, construct and optimize a prototype of a laser incineration chamber (LICh) for treatment of toxic medical wastes. The LICh must provide safe incineration of organic ...

Rostohar, Danijela; Bulgakova, Nadezhda M.; Flimelová, Miroslava
Fyzikální ústav, 2015

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