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1
Content available remote Magnetooptical gratings with circular dots
100%
Vlček J. , Pištora J. , Ciprian D. , Yamaguchi T. , Vávra I.
Optica Applicata
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2003
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tom Vol. 33, nr 2-3
263-271
EN
The Kerr reflection is studied on various cases of binary magnetooptical grating with circular dots. The grating schemes proposed correspond to irregular grating preparation. Kerr rotation is calculated using theoretical model based on coupled wave method. The results obtained are compared with experimental data and discussed to find conditions of optimal coincidence
2
Content available Numerical modeling of batch formation in waste incineration plants
100%
Obroučka K. , Vlček J. , Moravcová T. , Blahůšková V. , Fojtík P.
Polish Journal of Chemical Technology
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2015
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tom Vol. 17, nr 1
1--6
EN
The aim of this paper is a mathematical description of algorithm for controlled assembly of incinerated batch of waste. The basis for formation of batch is selected parameters of incinerated waste as its calorific value or content of pollutants or the combination of both. The numerical model will allow, based on selected criteria, to compile batch of wastes which continuously follows the previous batch, which is a prerequisite for optimized operation of incinerator. The model was prepared as for waste storage in containers, as well as for waste storage in continuously refilled boxes. The mathematical model was developed into the computer program and its functionality was verified either by practical measurements or by numerical simulations. The proposed model can be used in incinerators for hazardous and municipal waste.
3
Content available Experience with application of reagent to heat transfer surfaces of combustion device
100%
Blahůšková V. , Vlček J. , Grycová B. , Jančar D. , Velička M.
Polish Journal of Chemical Technology
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2017
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tom Vol. 19, nr 2
1--5
EN
The formation of deposits on heat exchange surfaces of combustion equipment causes a decrease in heat exchange, a decrease in power, and consequently deterioration in the economic balance of combustion equipment. The technology of French company A. I. T. DRIVEX has been developing and being applied in practice for many decades. Preventive technology is used as a mean reagent periodically injected during operation into the combustion chamber. Part of the application is always pre-prepared project resolving the location of the injection nozzles into the combustion chamber on the flue gas path. The article describes the experimental usage of reagent GEPERSUITE 2200 at the Sermaize refinery in France. The aim of the test is to evaluate the benefits and advantages of applied technology in the boiler refinery in full operation. The results clearly demonstrate that using the reagent GEPERSUITE 2200 is advantageous in terms of economic and technical properties.
4
Content available remote Primární ochrana povrchu betonu pomocí alkalicky aktivovaných materiálů
86%
Vavro M. , Boháčová J. , Bujdoš M. , Nováček J. , Tomková V. , Vlček J. , Ovčačík J.
Roczniki Inżynierii Budowlanej
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2010
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tom z. 10
83--86
CS
Povrchová ochrana betonových výrobků, dílců a konstrukcí výrazným způsobem přispívá k prodloužení jejich životnosti. V současné době jsou používány zejména metody druhotné ochrany povrchu betonu, které zahrnují především hydrofobizaci, impregnaci, penetraci, nátěry, nástřiky, stěrky a reprofilační hmoty [1, 2]. Jednou ze základních nevýhod povrchových ochranných systémů typu impregnací nebo nátěrů je jejich omezená časová účinnost. V případě povrchových úprav jako jsou nástřiky nebo stěrky je pak jedním z rozhodujících faktorů použitelnosti soudržnost nového materiálu se stávajícím podkladem. V případě špatné kompatibility obou materiálů, nedostatečného očištění podkladního povrchu nebo nesprávné aplikace ochranné vrstvy může jejich styková plocha představovat oblast snížené soudržnosti a dokonce vytvořit komunikační prostor pro prostup agresivních látek do konstrukce. Předložený příspěvek se zabývá možností primární ochrany povrchu betonu, kdy je povrchová ochranná vrstva aplikována již při výrobě betonových prvků nebo dílců. Základním hlediskem volby materiálu ochranné vrstvy byly jeho užitkové, zejména trvanlivostní vlastnosti. Proto byla pro testování vybrána malta na bázi alkalicky aktivované granulované vysokopecní strusky. Mezi hlavní přednosti alkalicky aktivovaných pojivových systémů totiž obecně patří velmi dobré pevnostní vlastnosti, odolnost vůči agresivnímu prostředí a vysokým teplotám [3 - 8].
EN
Presented article deals with a new method of primary protection of concrete surface by the mortar based on alkali activated granulated blast-furnace slag. Protective layer with the thickness of about approximately 5mm is in the form applied as the first one and promptly after its compaction the layer of concrete is applied to the fresh mortar. By this method the construction joint is not riced and the perfect connection between the protective layer and concrete is achieved. The protective layer based on alkali activated slag reaches excellent values of adhesion on concrete and essentially advances the resistance of concrete against frost and salt treatment.
5
Content available Measurement the Thermal Profile of Steelmaking Ladle with Subsequent Evaluation the Reasons of Lining Damage
86%
Vlček J. , Jančar D. , Burda J. , Klárová M. , Velička M. , Machovčák P.
Archives of Metallurgy and Materials
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2016
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tom Vol. 61, iss. 1
279--282
EN
Based on the operational measurement, of which content was to determine ladle thermal profile, there were analysed causes of possible damage of lining in steel ladles by steel breakout through the ladle shell. There exists connection between thermal state of ladle lining during the operation and its lifetime. There were reached to the conclusion that the cause of failure in the lining of ladle is except for high temperature of bath, also wide interval of temperature change during the tap operation, in consequence with possible insufficient pre-heating of ladle, discontinuous operation of aggregate and damage of insulating lining layer, respectively deformation of ladles shell.
6
Content available remote Spectral ellipsometry of binary optic gratings
72%
Pištora J. , Yamaguchi T. , Vlček J. , Mistrik J. , Horie M. , Smatko V. , Kováčová E. , Postava K. , Aoyama M.
Optica Applicata
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2003
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tom Vol. 33, nr 2-3
251-262
EN
The coupled wave method (CWM) has been applied to the description of electromagnetic wave propagation in binary optic gratings. The electromagnetic field and the permittivity profile are expanded into two-fold Fourier series. The reflection coefficients of 2D periodical structures have been specified and the ellipsometric angles of the shapes discussed have been computed. The theo-retical results are compared with experimental data obtained on SiO2 square dots on Si substrate. The measurements were performed using computer controlled four zone null ellipsometer in spectral range from 240 nm to 700 nm. The influence of SiO2 ultrathin oxidation layer and thickness of dots on spectral ellipsometric angles is also discussed
7
Content available Measurement the Thermal Profile of Steelmaking Ladle with Subsequent Evaluation the Reasons of Lining Damage
72%
Machovčák P. , Vlček J. , Jančar D. , Burda J. , Klárová M. , Velička M.
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nr 1
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