Národní úložiště šedé literatury Nalezeno 39 záznamů.  1 - 10dalšíkonec  přejít na záznam: Hledání trvalo 0.00 vteřin. 
Photocatalytic concrete screeds with self-cleaning and antimicrobial function
Bíbová, Hana ; Šubrt, Jan ; Pližingrová, Eva ; Jakubičková, M. ; Sázavská, T. ; Dohnálek, P. ; Hykrdová, Lenka ; Jirkovský, Jaromír
Photocatalytic concrete screeds with self-cleaning and antimicrobial function have been developed and tested. These building materials contain sand grains with deposited composite TiO2/SiO2 layers. Two types of the screeds, grey and white, were prepared and their photoactivity and material characteristics were compared. Commercial TiO2 photocatalysts from several manufacturers were employed. Effects of different parameters, such as temperature of the coated sand calcination, humidity, and surface abrasion, were followed. Mechanical properties of the screeds were analyzed by SEM/XRD microscopy. Photocatalytic activity was tested by means of NOx oxidation (ISO norm 22197-1/2007). Antibacterial activity was evaluated by modified ISO norm 27447/2009 with Bacillus subtilis as a model organism.
Mluva v obci Pištín ve třech generacích
JIRKOVSKÝ, Jan
Cílem této bakalářské práce bylo zjistit, zda a jaké nářeční rysy se vyskytují v běžné mluvě tří generací obyvatel obce Pištín. Výzkum probíhal na základě analýzy rozhovorů získaných od šestice rodilých mluvčích. Fonetický přepis těchto rozhovorů je součástí příloh. V teoretické části práce přibližuji problematiku českého národního jazyka a jeho útvarů, se zvláštním přihlédnutím k charakteristice jihozápadočeské nářeční podskupiny. Praktická část sestává z rozborů (fonetických a morfologických) dílčích promluv.
Photocatalytic active coatings-environmental way to improve quality and durability of buildings
Sázavská, T. ; Jakubičková, M. ; Jirkovský, Jaromír ; Šubrt, Jan ; Peterka, F.
Transparent coatings of TiO2-SiO2 nanocomposite were developed to be applied on building facades in order to prevent growth of microorganisms and thus to improve urban building sustainability. Structure and texture characteristics of the prepared nanocomposites were determined by electron microscopy (SEM, TEM + EDS), their photocatalytic activity was quantified by testing self-cleaning ability and antimicrobial activity. The self-cleaning properties were evaluated according to the standard ISO method based on photocatalytic degradation of methylene blue. The TiO2-SiO2 nanocomposite coatings were applied on various types of substrates commonly used in building industry. The antimicrobial activity was mainly investigated for algae because these microorganisms are often responsible for facades ageing. According to the laboratory tests the prepared TiO2-SiO2 nanocomposites are highly efficient. This fact was already proved by first applications in real conditions. The transparent SiO2-TiO2 nanocomposites represent an ecological and noninvasive way how to keep nice appearance of buildings for a long time. It is due to their permanent photocatalytic activity causing self-cleaning and algicidal effects. Such coatings may significantly reduce ageing processes on facades of buildings that are caused by microbiological pollution and smog exhalations.
Řidič v zajetí paragrafů
JIRKOVSKÝ, Jaroslav
Tato práce je zaměřena na pomoc řidičům v komunikaci a orientaci mezi subjekty oprávněnými provádět silniční kontroly, řídit provoz na pozemních komunikacích, vydávat pokyny a nařízení a provádět kontroly interiéru vozidel a zavazadlového prostoru, provádět orientační a odborná vyšetření na přítomnost alkoholu a jiných návykových látek v krvi řidiče. Odpoví na otázky práv a povinností příslušníků Policie ČR, Celní správy a Generální inspekce, jak jednotlivé příslušníky uvedených orgánů rozeznáme, kdy mají jednotlivé orgány právo zastavit vozidlo popř. provést kontrolu, jaká jsou práva a povinnosti řidičů ve vztahu k výše zmíněným orgánům.
TiO2 and WO3 thin films: Characterization, adsorption and photocatalytic degradation of oxalic acid and methylene blue
Brüger, A. ; Hrazdira, D. ; Waldner, G. ; Krýsa, J. ; Jirkovský, Jaromír ; Vinek, H. ; Schlögl, R. ; Rupprechter, G.
The importance of wastewater treatment needs no explanation. Thin transparent TiO2 and WO3 layers have shown photocatalytic activity in the decomposition of water pollutants and are promissing candidates for wide-scale applications.
Application of photocatalysis on TiO2 for pesticide removal
Krýsa, J. ; Jirkovský, Jaromír
Pesticides contaminate surface water mainly by washing from fields and crop-plant and by wind during aerial spraying. They may discrupt biologic equilibrium in streams due to their toxic effect on biocenosis. They can also unfavorably influence the self-cleaning ability of water, its odour and taste. Surface water is still treated and distributed as drinking water to more than half of the population in the Czech Republic supplied from public water conduits.
Reaction order of photocatalytic degradation of various organic compounds
Krýsa, J. ; Waldner, G. ; Jirkovský, Jaromír ; Grabner, G.
The kinetic of photocatalytic degradation of four different model organic compounds, formic acid (FA), oxalic acid (OA), 4-chlorophenol (4-CP) and 3-(4-chlorophenyl)-1,1-dimethylurea (the herbicide monuron), on irradiated titanium dioxide was compared.
Surface complexation and charge transfer processes in colloidal semiconductors studied by laser flash photolysis
Grabner, G. ; Jirkovský, Jaromír
Aqueous colloidal solutions of quantum sized particles of TiO2 undergo an ageing process beginning with their preparation. In course of time, the mean size of nanoparticles is gradually increasing and some of their physico-chemical properties are changing as well. In the present study, the decrease of the spectral blue shift of the semiconductor absorption threshold was measured to determine the corresponding changes of band gap energy of the Q-TiO2 particles.
Determination of quantum yield of photocatalytic degradation in suspension and on thin film of titanium dioxide
Měšťánková, Hana ; Zita, J. ; Navrátil, K. ; Krýsa, J. ; Jirkovský, Jaromír
The development of novel photocatalytic materials based on nanocrystalline titanium dioxide is a rapidly growing field of science and technology. Parallel to the industrial production and practical use of these materials, simple but reliable procedures for the characterization of their photoactivity are necessary. The testing methods are usually based on relative comparison of the photoefficiency of a probe to a standard under certain conditions.

Národní úložiště šedé literatury : Nalezeno 39 záznamů.   1 - 10dalšíkonec  přejít na záznam:
Viz též: podobná jména autorů
1 JIRKOVSKÝ, Jan
1 JIRKOVSKÝ, Jaroslav
1 Jirkovský, Jaromír
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