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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
191

Modifikace vlastností kladné elektrody na bázi MnOx pro AFC pomocí dopantů / Modification properties of MnOx based positive electrode for AFC

Kamrla, David January 2011 (has links)
The subject of this graduation thesis is low-cost alkaline power cells and especially electrodes with alternative catalyst made of MnOx + dopant. The thesis expands the bachelor´s thesis [1] and previous research [4] [12] [13] [14]. Volt-ampere characteristics and power characteristics of the katodes for AFC, subsidized with various dopants, are the outcome of this project. The project presents the optimalisation of preparation process of AFC electrodes. The aim is to prepair several electrodes with identical construction, which varies only with the type of the dopant.
192

Tenké vrstvy oxidu titaničitého připravené elektrochemicku cestou / Thin layers TiO2 prepared by electrochemical way

Janov, Pavel January 2012 (has links)
This work deals with issue of preparation active electrochromic film of titanium dioxide and intercalation properties. By electrodeposition was created active film on glass substrates covered with transparent conductive thin-film In2O3:Sn (ITO). The active films prepared by electrolytic way were compared with active films prepared by vacuum methods. Then has been studied theirs electrode properties in electrolytes containing lithium.
193

Experimentální ověření fotokatalytického působení TiO2 v betonech / Experimental verification of photocatalytic activity of TiO2 in concrete

Steinbergerová, Ivana January 2013 (has links)
This thesis is focused on gathering all available information on the application forms of photocatalytic TiO2 in concretes, especially in the surface layers of precast and monolithic structures. The paper describes in detail the properties of titanium dioxide alone, his special abilities, leading to a substantial improvement of the environment, through photocatalysis. Further verification methods are described photocatalytic activity of titanium dioxide and titanium dioxide application in real projects. The practical part is tested recipes of secondary coatings from the production of company Precheza a.s. Přerov.
194

Studium vlastností malt s pucolánově aktivními materiály / Study of the properties of mortars with pozzolanic active materials

Vaníček, Štěpán January 2015 (has links)
This thesis is focused on the study of the properties of mortars and pastes with active pozzolanic materials. It deals with monitoring cementitious composites which describes both the effect of compensation pozzolanic cement mortar admixtures active based on amorphous silica and the modifying polymeric additive. The main criteria for the assessment of these modified mortars and pastes are particularly adhesive and achieved strength compared with the reference mortar. The detailed work also examined the microstructure past through images from REM, records RTG, DTA and high pressure mercury porosimetry.
195

Výměníky tepla Sodík - Oxid uhličitý pro JE se sodíkem chlazeným rychlým reaktorem (SFR) / Sodium - Carbon-dioxide Heat Exchangers for Sodium Cooled Fast Reactor NPP (SFR)

Foral, Štěpán January 2011 (has links)
This master’s thesis deals with a design of Na-CO2 heat exchanger. There is a comparison of shell and tube heat exchanger with PCHE in the first part. Further the shell and tube heat exchanger with internally finned tubes was chosen as the basic conception. There was performed an optimization of construct and operations parameters for this concept. The optimization was performed on the basis of thermal and hydraulic calculations. Further there were performed calculations for ensuring of safe operation of the heat exchanger. The conclusion of the diploma thesis deals with comparison of the designed heat exchanger with similar projects.
196

Fluidní kotel na spalování uhlí a biomasy 150t/h / Fluidized bed boiler for burning coal and wood 150t/h

Popelka, Ondřej January 2012 (has links)
This thesis is focused in calculation and designing of fluid bed boiler for burning coal and wood biomass in the form of wood chips. The uniqueness of fluidized bed boiler is circulating fluidized layer and cyclone ash separator from flue gases beyond the combustion chamber.Work was divided into several parts due to different parameters of the fuel.. Stoichiometry calculations, emissions calculations, enthalpy of combustion and flue gas desulphurization calculations are performed in various parts.Further, calculating of the losses of boiler and its efficiency comparing to the calculation and design of each heat transfer surfaces was also solved so that resulting size and quantity meet the required specifications.Drawn set of this designed boiler based on calculations is included in the annex to this paper.
197

Optimalizace složení pracovní hmoty pro výrobu hutného dinasu. / Optimization of Working Mass Composition for Dense Silica Bricks Production.

Maňák, Jan January 2016 (has links)
A silica bricks is a refractory material which is used mainly in coke industry, glass industry and metallurgy. This material constitute of the quartz modifications. Compact silica is an irreplaceable part of the coke battery and its compactness and robustness is important for quality and long endurance. Very important for large compactness is a grain curve of work matter. This thesis deals with influence of different grain of work matter.
198

Thermal lens spectrometric detection of MRI contrast agents in the process of their photocatalytic degradation / Thermal lens spectrometric detection of MRI contrast agents in the process of their photocatalytic degradation

Petruľák, Michal January 2016 (has links)
Diplomová práce je zaměřena na studium degradace kontrastních látek pro magnetickou rezonanci. Tyto látky se dnes ve velké míře používají v oblastech s rozvinutým zdravotnictvím. Můžeme je najít v odtocích z čistíren odpadních vod, což svědčí o tom, že běžné stupně čištění odpadních vod nejsou dostatečně efektivní pro jejich odstranění. O degradaci kontrastních látek na bázi gadolinia je jen málo informací. Fotokatalytický rozklad za pomoci oxidu titaničitého a také ozonace vybrané kontrastní látky gadobutrolu, byl sledován pomocí měření celkového organického uhlíku, mikroskopie termálních čoček a spektrofotometrie.
199

Snížení emisí SO2 ve spalinách z fluidního kotle / Reducing emissions of SO2 in the flue gas from the fluidized bed boiler

Tesař, Jan January 2016 (has links)
Aim of this thesis is to design a technology of a flue gas desulphurization of fluidized bed boiler. Currently, the state of technology is not able to provide flue gas desulphurisation to required level. For this reason it is necessary to build additional device for the desulphurisation. Theoretical part of the thesis deals with the emission limits of sulphur dioxide, available methods of desulphurization and sorbents suitable for the desulfurization. In practical part conditioned dry sorption method is chosen for the specified source, technological and structural design for suggested desulphurization technology including design of all device is proposed. The thesis also includes a technology design and a 3D model.
200

Röntgenografische Charakterisierung von Indium-Zinn-Oxid-Dünnschichten

Kaune, Gunar 26 September 2005 (has links)
Mittels reaktivem Magnetron-Sputtern hergestellte Indium-Zinn-Oxid-Dünnschichten wurden mit den Methoden der Röntgendiffraktometrie und Röntgenreflektometrie charakterisiert. Es konnte gezeigt werden, dass die Wahl des Arbeitspunktes bei der Schichtabscheidung erheblichen Einfluss auf Kristallitorientierung, Gitterkonstante und Größe der Schichtspannung hat. Zusätzlich wurden mittels des Langford-Verfahrens Korngröße und Mikrospannungen bestimmt. Im Rahmen der röntgenografischen Spannungsmessung zeigten sich nichtlineare Verläufe der Dehnung über sin²Ψ, die mit dem Kornwechselwirkungsmodell nach Vook und Witt erklärt werden.

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