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Geologická a dendrologická charakteristika Javornického lomu
Hemr, Ondřej
The main goal of this bachaleor thesis is geological, pedological and dendrological research in Javornice quarry. It's extraction has temporarily ended in 1998. The quarry is located a few kilometres to the east of Rychnov nad Kněžnou in the foothills of Orlické hory. The spot is going through an intense succession for the last two decades which represents appropriate moment for evaluation. Theoretical body of the thesis consists of wide-ranging literary characteristics of the spot: position, history of extraction and prospection, climate and phytogeography classification, vertical-horizontal classification, bedrock characteristics, soil classification, geomorphology and ecological relationships. The research body of the thesis consists of chemical analysis of soils developed after the end of extraction on the bedrock with particular regard to toxic elements such as arasenic, zinc, lead, mercury etc. In the next phase a research body of the thesis follows generic composition of woody plants occupying the spot and analysis its presence on a particular distinguished habitat.
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Měření obsahu hliníku v potravinářkých obalech
Vopálenská, Ludmila
The diploma thesis deals with aluminum food packaging. At first was made a literature recherche relating to this subject. In the next part was realized market analysis of food products, in which is usually used aluminum or aluminum composite in the Czech Republic. After the market analysis we were measuring the samples. We choosed dairy products packaging, for example packaging of the yoghurt (different sizes), the packaging from a curd, from a blue cheese and thermized cheese (Lučina). In selected types of dairy products packaging was set qualitative weight distribution of aluminum-containing composite materials and with the X-ray fluorescence spectrometry was made the qualitative measurement of the aluminum content in these obtained samples. The aluminium content in the metal parts of my samples was between 46,9% and 99,1%.
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The study of zinc influence on Portland cement hydration.
Ptáček, Martin ; Janča, Martin (referee) ; Šiler, Pavel (advisor)
The topic of this work is the monitoring of the effect of zinc on the hydration process in Portland mixed cement (specifically with the addition of finely ground granulated blast-furnace slag, high temperature fly ash and fluidized bed combustion filter ash). How much zinc and at what time it remains in the pore solution during hydration. Activation energy of a mixture of cement with zinc in the form of soluble salts (Zn(NO3)2.6H2O and ZnCl2) and insoluble oxide (ZnO) by isothermal calorimetry was also investigated. The XRF method has shown composition during hydration. The zinc retardation effect was investigated by isothermal calorimetry and activation energy was calculated using this method. The XRF and ICP-OES methods were used to measure the zinc content of the pore solution. And the amount of portlandite was monitored by the DTA and XRF method.
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Ink formulation for chemical labels printing
Martiniaková, Ivana ; Krystyník,, Pavel (referee) ; Veselý, Michal (advisor)
This diploma theses is about the study of the effect of individual components of printing compositions intended for material printing of identificaton codes, read by X-ray fluorescence. Two printing technologies were used – screen printing and pad printing. The composition of the print compositions has been optimized in term of visual recognition, print repeatability, a dry matter content providing an X-ray fluorescence signal, as well as optimization of the material print process leading to the creation of invisible identification tags for archive documents.
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Uranium in historical ceramic glazes: Determination by alpha radiation detection and comparison with other methods
Vopat, Michal ; Goliáš, Viktor (advisor) ; Jelínek, Emil (referee)
In the Czech Republic yellow and ivory glazes with uranium in the Ditmar-Urbach and Terra Teplice companies were manufactured in the pre-war and inter-war period. The production of these glazes took place at the latest since the 1900, the material springs have existed since 1912. Their production ended in 1945. The most suitable method of non-destructive determination of uranium was the measurement of surface alpha activity on planar surfaces by a probe with a ZnS (Ag) scintillator constructed special for this bachelor thesis. Altogether 85 samples, evidence of this production, were measured. To determine the conversion of detected alpha activity to uranium content, an indirect calibration method was chosen to measure uranium content in three types of glazes by WDS analysis. In the studied set, uranium contents ranged from 0.2-2.2 % with the highest frequency ranging from 0.5-0.6 % U. 16 samples of yellow and ivory glazes were without added uranium with contents up to 322 ppm eU. Comparison of uranium contents determined by surface alpha activity measurement with area beta activity confirmed that the glazing does not form a saturated layer for beta radiation. Three types of glazes analyzed by WDS were also measured by XRF. By comparing uranium contents determined by both methods, it was found that...
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The optimization of quarried limestone analysis and usage.
Sidelnicov, Vitalii ; Bednárek, Jan (referee) ; Šiler, Pavel (advisor)
Limestones are rocks formed predominantly from the mineral calcite. The Czech Republic is quite rich in this type of rock. Limestone may have a very diverse composition, properties and uses. For this reason, it is beneficial to study and analyze this material, to better utilize it to its full potential. This bachelor thesis deals with the possible uses of limestone from Lesní lom in Líšna in the city of Brno, which consists of two limestones - Hádsko-Ričský and Vilemovický. Limestone analyses were performed using by the following analytical methods: XRF, XRD and ICP-OES. Furthermore, the thesis deals with the preparation of samples for individual analytical methods and the differences of the results obtained by individual methods. Part of the thesis is also an overview of the possible uses of analysed limestones.
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Geochemická charakteristika půdního prostředí se zaměřením na kontaminaci podél vybraných silničních komunikací
Ambrožová, Pavlína
Roadside soils are affected by traffic. Topsoil samples were collected at 35 Moravian localities with varying traffic intensity. They were analyzed by XRF spectrometry to obtain total element composition. The evaluation of results was carried out with an emphasis on risk elements (Cr, Ni, Cu, Zn, As, Mo, Cd, Pb). Positive correlation between traffic intensity and Cu and Pb content in the soil was discovered. The evaluation of the level of contamination was carried out on the basis of the limits announced by the Czech Ministry of Environment. The whole diploma thesis is supplemented by a review in order to provide a comprehensive view on this extensive issue.
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