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Possibilities of classical fly ash utilization after denitrification of flue gas
Snop, Roman ; Dvořák, Karel (referee) ; Bílek, Vlastimil (referee) ; Havlica, Jaromír (advisor)
This doctoral thesis, "Possibilities of using conventional fly ash after flue gas denitrification", deals with the solution and processing of data on the issue of ammonia / contaminated fly ash after selective non-catalytic reduction (SNCR) technology in coal-fired power plants. Also this thesis is focused on experimental verification of the effect of ammonium salts on the properties of fly ash and the effect on the working environment. Basic data on the issue of ammonia ash were collected. Specifically, these are several main areas of research. The binding of ammonia in fly ash produced after SNCR is described, the problem of determination of ammonium ions in fly ash, mortars and concretes is solved. Furthermore, the effects of the use of ammonia fly ash on the properties of concrete are experimentally verified, and the work also deals with the leachability of ammonia fly ash
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Study of the internal excitation of anhydrite
Kantorová, Kateřina ; Gazdič, Dominik (referee) ; Dvořák, Karel (advisor)
The presented diploma thesis deals with the possibilities of internal excitation of anhydrite mortars. It is divided into a theoretical part, in which the general distribution of sulfate binders is described, focusing primarily on anhydrite, stimulators, and hydration of anhydrite, and a practical part, which is devoted to research, design of the experiment, dosage of stimulators, firings, and the experiment itself. The practical part describes the current research on anhydrite excitation, which took place at the Institute of technology of building materials and components. The diploma thesis follows on from the previous bachelor's thesis. It continues with two internal drivers, which optimize the fineness of grinding and the degree of firing at the same time.
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Study of Alit structure and stability
Pernicová, Kateřina ; Všianský,, Dalibor (referee) ; Dvořák, Karel (advisor)
The diploma thesis deals with the laboratory preparation of the main clinker mineral alite. The theoretical part summarizes the main findings of recent research. The practical part is devoted to the preparation and optimization of the methodology for the preparation of alite polymorph. The main goal was to prepare monoclinic phases of M1 and M3 alites and analyze their properties by available analytical methods.
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Study of limestone decarbonation process
Koporcová, Diana Mária ; Bureš,, Jaroslav (referee) ; Dvořák, Karel (advisor)
Submitted master´s thesis examines research of connections between the type of limestone and the process of decarbonation. Types of limestones and genesis of limestones are described in the theoretical part of the thesis, followed by the description of the process of decarbonation, methods used for analysis of limestone structure and research of solved problems. Experimental part of the thesis describes HT-XRD analysis, SEM analysis and simultaneous TG/DTA analysis performed on chosen group of limestone samples. The process of decarbonation and the change of microstructure of the developing calcium oxide are examined from the obtained data.
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SYNTHESIS AND DETERMINATION OF PROPERTIES OF PURE PHASES OF PORTLAND CLINKER AND THEIR POLYMORPHS
Ravaszová, Simona ; Keppert, Martin (referee) ; Reitermann, Pavel (referee) ; Palou, Martin (referee) ; Dvořák, Karel (advisor)
Quantitative diffraction analysis is currently carried out through Rietveld analysis, which is able to decode the various diffraction lines on a diffraction record, provided that the structural model for each clinker phase is well known. The subject of this dissertation is the laboratory preparation of pure phases of one triclinic and two monoclinic polymorphs of the main clinker mineral alite, which will serve as standards for the calibration of powder X-ray diffraction analysis. The result of this work will be detailed procedures for the preparation of individual polymorphs of alite and calibration relationships for unambiguous and easier identification of monoclinic polymorphs in real clinkers.
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Methods of excitation of binders based on anhydrite
Sedlák, Michal ; Dvořák, Karel (referee) ; Gazdič, Dominik (advisor)
The bachelor thesis deals with the internal excitation of anhydrite-based mortars. In the theoretical part, the general theory of sulphate binders, the formation of gypsum binders and their resulting products during firing are described. The theoretical part also describes the anhydrite mortars, their hydration process and collects the existing research on anhydrite excitation in the world, where, among other things, it deals with the further usability of the resulting gypsum by-products. The experimental part focuses on the internal excitation of anhydrite, which is based on the existing research at the THD Institute. The work builds on previous studies that also dealt with internal excitation research. It includes an experiment performed to optimize the thermal regime in the form of increased isothermal endurance with subsequent evaluation by XRD analysis.
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Right to a substitute fee for distribution of a copyrighted work - Czech and German regulation in the European contexts
Dvořák, Karel ; Dobřichovský, Tomáš (advisor) ; Císařová, Zuzana (referee)
Vergütungspflicht bei der Vervielfältigung von Urheberwerken - die tschechische und deutsche Regelung im europäischen Kontext Abstrakt Die Vervielfältigung zu privaten Zwecken ist eine der Schranken vom Recht des Urhebers, das Werk zu nutzen. Auf der Grundlage eines Konzepts, das in den 1960er Jahren in Deutschland entstanden ist, ist eine solche Vervielfältigung nur dann möglich, wenn dem Urheber für einen solchen Eingriff in seine wirtschaftlichen Interessen Vergütung gewährt wird. Wie auch in anderen Bereichen des Urheberrechts ist es auch im Falle des Systems der Vergütungen notwendig, ein Gleichgewicht zwischen den Interessen des Urhebers und der gesamten Gesellschaft zu finden. Ein weiteres typisches Zeichen im Zusammenahng mit dem Institut der Vergütungen ist die technologische Entwicklung, die auch der Motor bei der Einführung des Systems der Vergütungen in den 1960er Jahren war. Die Arbeit widmet sich im ersten Kapitel den Gründen für die Einführung des Systems der Vergütungen und den Möglichkeiten seiner Ausgestaltung. Das heißt der Einführung der Vergütungspflicht im Zusammenhang mit bestimmten Geräten, Trägern und dem Angebot einiger Dienstleistungen zu zahlen. Der Problematik der Vergütung wird eine große Aufmerksamkeit sowohl seitens der Fach- wie seitens der breiten Öffentlichkeit gewidmet -...
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Effects of n-3 polyunsaturated fatty acids on development of non-alcoholic fatty liver disease in experiment, prevalence in patients with type 2 diabetes mellitus and metabolic syndrome, non-invasive diagnostics
Dvořák, Karel ; Brůha, Radan (advisor) ; Ehrmann, Jiří (referee) ; Lotková, Halka (referee)
This thesis focuses on the effects of n-3 polyunsaturated fatty acids (n-3 PUFA) on development of non-alcoholic fatty liver disease (NAFLD) in experiment, on prevalence of this condition in patients with type 2 diabetes mellitus and metabolic syndrome and also on non-invasive diagnostics. The aim was to study the effect of n-3 PUFA on NAFLD development in an experimental model and based on analysis of a group of patients with type 2 diabetes and metabolic syndrome to assess the prevalence of this condition. Lastly we aimed to evaluate non-invasive diagnostic methods of liver fibrosis and NASH. We demonstrated beneficial effects of n-3 PUFA administration on NAFLD development in a C57/Bl6 mice high fat methionin-cholin defficient dietary model of NAFLD. n-3 PUFA administration led to biochemical improvement, decrease of lipid accumulation in the liver as well as improvement of histology. These effects are determined by complex modulation of lipid metabolism, mainly due to decrease in availability of fatty acids for triglyceride synthesis in the liver, changes of adipokine levels and amelioration of proinflammatory status in the liver. In a group of type 2 diabetics we found NAFLD prevalence of almost 80%, 14% of these patients had also signs of liver fibrosis or cirrhosis. Non-invasive methods...
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