Národní úložiště šedé literatury Nalezeno 12 záznamů.  1 - 10další  přejít na záznam: Hledání trvalo 0.02 vteřin. 
Záchyt vodíku defekty ve vrstvách připravených TEA CO2 laserem ablací oxidi křemnatého a křemičitého
Dřínek, Vladislav ; Vacek, Karel ; Južakov, G. ; Pola, Josef ; Naumov, S.
Deposity obsahující křemík byly připraveny pomocí TEA CO2 pulsní ablace targetů ze SiO a SiO2 ve vzácných plynech. Chemické skupiny a defekty obsahující vodík byly analyzovány pomocí FTIR a EPR technik a teoretických výpočtů. V SiO2 depozitech koncentrace silylu popř. peroxy radikálu byla určena 5.8.10(18)/g resp. 6.2.10(19)/g. V SiO depozitech byl určen poměr [=Si(:)]/[Si(.)]. Po expozici SiO depozitu v H2 atmosféře byl změřen EPR dublet s hyperjemným roštěpem 7.7 mT. Nejlepší shoda mezi teoretickou a naměřenou hodnotou byla nalezena pro klastr (O2H)Si(.).
Utilization of plasma spraying for production of nanocrystalline ceramic materials
Chráska, Tomáš
The technique of plasma spraying is now being investigated as an apt candidate for production of nanocrystalline materials.In the conventional plasma spraying (PS) process,powder particles injected into a high temperature plasma jet are quickly melted and propelled onto a substrate where they spread upon impact and rapidly solidify.Due to the rapid solidification, the conventional PS.
Preparation and properties of nanocomposites based on Zr-Fe
Roupcová, Pavla ; Schneeweiss, Oldřich ; Bezdička, Petr
The spark erosion of the pure Zr and Fe electrodes in hydrogen yielded nanocrystalline powder consisting of the mixture of Zr-rich (Zr3FeH7, ZrO2, and Zr(Fe)) and Fe-rich phases with the mean chemical composition Zr-3.2wt.%Fe. Heat treatment in hydrogen atmosphere at 973K induced phase decomposition and transitions with the final composition of bcc Fe, Zr3Fe, ZrH2 and dominating ZrO2 phases. The result indicates that formation of Fe-rich phase (bcc Fe) embedded in ZrO2 could be possible using an appropriate heat treatment of the as-prepared powder.
Preparation and properties of MgO-Ni(Fe) nanocrystalline composite
Schneeweiss, Oldřich ; Pizúrová, Naděžda ; Jirásková, Yvonna ; Žák, Tomáš ; Bezdička, Petr ; Večerníková, Eva
We have prepared MgO-Ni(Fe) nanocrystalline composites by controlled heat treatment of compacted spark synthesized nanocrystalline powders. Besides particle sizes and their chemical compositions, influence of interaction with surrounding atmosphere and adsorbed gases on phase composition and magnetic properties were investigated. Mössbauer spectroscopy, x-ray diffraction and TEM were used for phase analysis. Thermomagnetic curves and DTA/TG measurements were applied for detection of changes in structure and phase composition during heat treatments. The simultaneous gas analysis using mass spectroscopy by heating yielded information on adsorbed and dissolved gases and their reactions with the nanoparticles.
Diffusion of Fe in Fe76Mo8B15Cu1 amorphous alloy during crystallization
Čermák, Jiří ; Stloukal, Ivo ; Jirásková, Yvonna
Iron diffusion has been studied in amorphous alloy Fe73Mo8B15Cu1 using serial sectioing method combined with Ar+ DC-glow discharge sputtering.
Modeling of diffusion barrier in nanocrystalline growth
Čermák, Jiří ; Rothová, Věra
The diffusion of Ge, simulationg the diffusion of Si was studied in eutectic Fe-Nb, in iron and in the Fe2Nb compound, which models the Nb-rich envelope of growing FexSi crystallites in FINEMETs.
Amorphous and nanocrystalline Iron(III) oxides from thermally induced solid-state reaction
Zbořil, R. ; Mašláň, M. ; Machala, L. ; Grygar, Tomáš
Iron(III) oxides presents as a unique polymorphic compound yielding the varied structural forms with different particle size and morphology depending on the preparation method.
Homogeneous precipitation with urea - general preparation method to obtain metal oxide nanoparticles
Šubrt, Jan ; Štengl, Václav ; Bakardjieva, Snejana ; Maříková, Monika
Heterogenous precipitation based on moxing of solutions of alkalis and soluble metal salts in aqueous media is commonly used method for preparing oxide-hydroxides of trivalent (Fe, Al, Cr) or tetravalent ( Ti, Zn ) metals.
Uncoupling DNA restriction and DNA translocation functions of type i restriction modification enzyme ecor124ri - a rptential molecular motor
Šišáková, Eva ; Weiserová, Marie
Molecular machines are ubiquitous in living organisms where they manipulate and modify other molecules particularly DNA.
Association of EF-Tu with biological membranes and its aggregation increases factor,s NANO-switch potential
Holub, Martin ; Kalachová, Ladislava ; Bezoušková, Silvia ; Weiser, Jaroslav
Protein synthesis elongation factor Tu(EF-Tu) represents one of the major components of translation system in prokaryotes on correct positioning of the incoming aminoacyl-tRNA on the ribosome where polypeptide chain is synthesised.

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