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Záznamy kolekce (řazeno podle Datum zaslání v sestupně pořadí): 1 až 13 z 13
Hruška, Matěj , Vostřák, Marek , Tesař, Jiří
The influence of controlled steel surface oxidation on near-infrared light absorption in inert atmosphere

The aim of this paper is to examine the effect of the oxide layer thickness on the absorption of IR radiation in the inert gas atmosphere. The oxide layers are created by the controlled heating method, while the different thickness of layers is achieved by changing t...

Krempaský, j. , Springholz, Gunther , Minár, Jan , Dil, Jan Hugo
alpha-GeTe and (GeMn)Te Semiconductors: a New Paradigm for Spintronics

GeTe is the simplest known binary ferroelectric semiconductor with a narrow band gap. Below 700 K it assumes a non-centrosymmetric rhombohedral structure in which an electric dipole is formed due to a relative Ge/Te sublattice displacement along the [111] direction. Ferroelectric polari...

Vostřák, Marek , Hruška, Matěj , Houdková - Šimůnková, Šárka , Smazalová, Eva
Koaxiální laserové povlakování stelittu: Analýza procesních parametrů

The paper summarizes the results of first series of laser cladding experiments. New system combining the solid state disc laser with power up to 5.3 kW and cladding head with coaxial powder feeding was used. The powder used in experiments was Stellite 6. The experiment wa...

Vostřák, Marek , Houdková Šimůnková, Šárka , Česánek, Zdeněk
Vliv procesních parametrů na strukturu a vlastnosti laserově povlakovaného WC-NiCrBSi

In this study, the influence of main laser cladding parameters on the final microstructure of cladded WC-NiCrBSi coating is discussed. As the used powder is the blend of 60% tungsten carbide spherical particles and 40 % NiCrBSi matrix, the carbides’ morphology and distribution in&#...

Vostřák, Marek , Tesař, Jiří , Houdková Šimůnková, Šárka , Hruška, Matěj
Možnosti kontroly hloubky protavení během laserového přetavení žárově stříkaných povlaků

Laser remelting of thermally sprayed coatings is a promising possibility how to improve their functional properties. However, it requires precise control of processing parameters to achieve desired depth of remelting. In this study, the near-infrared (NIR) camera is used to measure the ...

Houdková Šimůnková, Šárka , Vostřák, Marek , Česánek, Zdeněk , Smazalová, Eva , Glanc, Aleš
Mikrostruktura a vlastnosti tepelně ovlivněného HVOF nástřiku povlaku Hastelloy C-276

The influence of heat treatment on the microstructure, mechanical and sliding wear properties of Hastelloy C-276 HVOF sprayed coatings was evaluated. The applied furnace heat treatment modified the coatings microstructure, leading to precipitation hardening and oxidation of inter-splat boundaries, but...

Křenek, Tomáš , Karatodorov, Stefan , Medlín, Rostislav , Mihailov, Valentin I. , Savková, Jarmila
Pulsní laserová Nd:YAG depozice nanostrukturovaného FeS1-x obsahujícího metastabilní fáze

Pulsed near-IR laser irradiation of ferrous sulfide (FeS) in a vacuum allows a noncongruent ablation and deposition of nanostructured FeS1-x thin films. Deposition has been performed on Al, Ta and Cu unheated substrate and analyzed by scanning (SEM) and high resolution transmission elec...

Kovářík, Tomáš , Křenek, Tomáš , Pola, Michal , Rieger, David , Kadlec, Jaroslav , Franče, Petr
Keramická pěna s otevřenou pórovitostí na bázi geopolymerního substrátu pro katalytické čištění odpadních vod

This paper presents results from experimental study on microstructural and mechanical properties of geopolymer-based foam filters. The process for making porous ceramic-like geopolymer body was experimentally established, consists of (a) geopolymer paste synthesis, (b) ceramic filler incorporation, (c) coa...

Čekalová, Marcela , Kovářík, Tomáš , Rieger, David
Rheological characterization of geopolymer binder modified by organic resins

The purpose of this study is going to investigate properties of alkali-activated powder (calcined kaoilinitic clay and granulated blast furnace slag) prepared as a geopolymer paste and modified by various amount of organic resin. Hybrid organic-norganic binders were prepared as a mix of...

Rieger, David , Kullová, Lucie , Čekalová, Marcela , Novotný, Pavel , Pola, Michal
Mechanicky aktivovaný úletový popílek jako vysoce výkonné pojivo pro stavebnictví

This study is aimed for investigation of fly ash binder with suitable properties for civil engineering needs. The fly ash from Czech brown coal power plant Prunerov II was used and mechanically activated to achieve suitable particle size for alkaline activation of hardening process...

Remiš, Tomáš
Reologické vlastnosti poly(vinyl alkohol) (PVA) kompozitních membrán pro palivové články

Rheological properties of new anhydrous proton conducting membrane based on PVA, tetraethyl orthosilicate (TEOS),sulfosuccinic acid (SSA), titanium dioxide (TiO2)was examined at various stoichiometric ratios. SSA was used as sulfonating agents to form a crosslinked structure and as proton source, wher...

Kadlec, Jaroslav , Rieger, David , Kovářík, Tomáš , Novotný, Pavel , Franče, Petr , Pola, Michal
Vliv náhrady metakaolínu struskou v alkalicky aktivovaných anorganických pojivech pro stavebnictví

In this study the effect of metakaolin replacement by milled blast furnace slag in alkali-activated geopolymeric binder was investigated in accordance to their rheological and mechanical properties. It was demonstrated that slag addition into the metakaolin binder can improve mechanical propertie...

Karatodorov, Stefan , Mihailov, Valentin I. , Křenek, Tomáš , Grozeva, Margarita
Optická emisní spektroskopie plasmy vzniklé laserovou ablací sulfidu železnatého

Optical emission spectroscopy studies are reported of laser ablation plasma from an iron sulphide (FeS) target in vacuum. The plasma emission is characterized with spatial and tempoal resolution. The spectral observations are used to calculate the electron plasma parameters. The electron tem...

Záznamy kolekce (řazeno podle Datum zaslání v sestupně pořadí): 1 až 13 z 13