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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
The effect of moisture on the surface strength of sandstone rock outcrops
 Fraňková, Kateřina-Alexandra ; Weiss, Tomáš (advisor) ; Bruthans, Jiří (referee)
The aim of the thesis is to evaluate the influence of moisture on the tensile strength of sandstone rock outcrops and also to evaluate the possible influence of man on the erosion of sandstone rocks, especially by climbing activities, by means of a research study and specific examples from my own and non-own researches. Just a few studies have so far addressed the effect of moisture on the tensile strength of sandstone, and although the results of these studies generally suggest that the tensile strength of sandstone rock outcrops decreases with increasing moisture, there are differences depending on the specifics of the selected study areas. It would therefore be interesting to do a study that names and evaluates the possible aspects influencing this dependence. In my thesis I have evaluated studies carried out using different methodologies, which are described in a separate chapter. The results of the studies show that the tensile strength does indeed decrease with increasing moisture content, but the degree of decrease depends mainly on the mineralogical composition of the rock. The tensile strength of rocks with a high clay or organic content will decrease significantly more with increasing moisture than the tensile strength of rocks with a high quartz content. I have also reviewed several...
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Dating of uranium secondary minerals by the Thermal ionization mass spectrometry and α-spectroscopy
 Roll, Michal ; Goliáš, Viktor (advisor) ; Strnad, Ladislav (referee)
SUMMARY: This paper is focused on analytical methods, specifically on thermal ionization mass spectrometry and alpha spectrometry; both methods are often use for dating of minerals or rocks. Goal of this paper is to compare these methods and decide which one is more suitable for dating of secondary uranium minerals. Methods are completely different and we judge them closely and take into account every fact not just technical skills as accuracy or speed which are in favor of thermal ionization mass spectrometry, but also device availability, price or published researches which are in favor of alpha spectrometry. There is also suggestion that both methods can cooperate and it seems as most effective way and there is another suggestion how studies a secondary uranium minerals.
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