National Repository of Grey Literature 215 records found  1 - 10nextend  jump to record: Search took 0.02 seconds. 
Excimer Laser-Induced CVD of Carbon Encapsulated Cobalt Nanoparticles
Fajgar, Radek ; Maryško, Miroslav ; Dřínek, Vladislav ; Kupčík, Jaroslav ; Šubrt, Jan
Decomposition of acetylene / Co(CO)(3)(NO)mixtures induced by excimer ArF laser pulses is an efficient technique for preparation of amorphous cobalt nanoparticles encapsulated in carbon. Vacuum heating up to 900 degrees C leads to crystallization the metal core. The cobalt core crystallizes in a face-centered cubic (beta) form as revealed by X-ray and electron diffraction techniques and carbon affords graphite outer part. Properties of the Co(core) - carbon(shell)nanocomposites were examined by spectroscopy and microscopy techniques. Magnetization studies revealed paramagnetic behavior of the as-prepared amorphous deposit and superparamagnetic behavior of the annealed samples.
The analysis of the melting process
Němec, Lubomír ; Jebavá, Marcela
The analysis of the melting process provides some non-traditional opportunities when intersifying the main homogenization processes.
Dating of cave sediments and reconstruction of karst morphology of the Nízké Tatry Mts
Kadlec, Jaroslav ; Danišík, M. ; Hercman, H. ; Pruner, Petr ; Chadima, Martin ; Schnabl, Petr ; Šlechta, Stanislav ; Grygar, Tomáš ; Granger, D.
The paleomagnetic polarities were measured both in clastic and chemogenic cave sediments preserved in eleven horizontal cave levels occur at different alitudes in the Jánska, Demänovská and Mošnica karst valleys in the Nízké Tatry Mts. Based on the obtained polarity data were are able to distinguish cave sediments deposited during the Brunhes, Matuyama and Gauss chrons. The stratigraphic interpretation was partly verified by U-series datings of speleothems preserved in the sedimentary sections. Except for the horizontal cave levels located in karst valleys, additional cave systems were formed at extremly high alitudes in the Nízké Tatry Mts. Preliminary data show predominantly reverse paleomagnetic orientations in fluvial activity in these caves and deposition of clastic sediments during Gilbert Chron.
Analýza vztahu struktura-antimykobakteriální aktivita užitím softwarového systému LispMiner
Hálová, Jaroslava ; Macháček, M. ; Rauch, J. ; Aust, M.
The results are in concordance with the results of Free-Wilson method. The association rules as a tool of analysis of structure-activity relationshopins have been thus validated on the structure-antimycobacterial activity data.
Magnetic measurements of iron/graphite core-shell structured nanoparticles
David, Bohumil ; Pizúrová, Naděžda ; Schneeweiss, Oldřich ; Bezdička, Petr ; Morjan, I. ; Alexandrescu, R.
We present magnetic and morphological characterization of iron- and iron-carbide- based nanopowder obtained by the laser synthesis from sensitized gas phase mixture containing acetylene and iron pentacarbonyl vapors. The analysis was performed on the as-prepared material and the annealed material. The results of TEM, XRD, Mössbauer and magnetic measurements are reported. During annealing of the nanopowder core-shell nanoparticles appear.
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.
Production of Fertilizers from Secondary Liquid Product of Uranium Ores
Markvart, Miroslav ; Jirátová, Květa ; Matoušek, P. ; Soukup, M.
Ammonium aluminium alum obtained from waste liquor of uranium ores leaching can be converted to commercial NS fertilizer by a simple and economically advantageous process based on ammonia action on solution of alum and ammonium nitrate or nitric acid, respectively. Resulting fertilizer is composed of ammonium sulphate ammonium nitrate and aluminium hydroxide, which affects quality of fertilizer in a favourable way.
EURACHEM and ensure quality chemical analysis
Plzák, Zbyněk
EURACHEM - inthernational system chemical measurement.
Guide of application referenc matherials in laboratory
Plzák, Zbyněk
Databasis "COMAR" contains reference data and materials.

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