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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Research of the effect of desicants on moisture adsorption
 Němec, Mojmír ; Lisá, Hana (referee) ; Elbl, Patrik (advisor)
Desiccants are special materials that can effectively adsorb moisture from the surrounding air or space. Desiccants such as silica gel or molecular sieve are often used in laboratory applications, for example to determine the properties of solid fuels. The introduction of the research section is devoted to the description of these properties. The thesis then describes the methods used to accurately determine the moisture in solid fuels. The main part of the thesis is devoted to desiccators together with desiccants, which form a significant part in the process of determining moisture in solid fuels. The experimental part deals with the investi-gation of the effect of different desiccants on the rate of air moisture depletion in the desic-cator under laboratory conditions. The moisture loss in the desiccator is measured using the SHT4x Smart Gadget, which is placed in the desiccator together with the desiccant. The out-put of the experimental measurements are the moisture uptake rate curves of different desic-cants for desiccant weights of 50 g, 100 g, 150 g, 200 g and 250 g. At the end of the thesis, the measured curves of the different desiccants are compared with each other in terms of efficiency.
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The dating of the minerals o uranium-polymetallic mineralization of the Jánská vein, Příbram-Březové Hory, ČR, using alpha-spectrometric determination of the radioactive disequilibrium of isotope pairs of uranium decay series (technical part);Radioactivity in nature and its utilization in the geological sciences (didactical part)
 Jarka, Petr ; Němec, Mojmír (referee)
The thesis deals with distribution and determination of natural radionuclides occured in primary and secondary mineralization of Jánská vein, which represents the part of uranium - polymetallic deposit of Březové Hory, Příbram polymetallic district. Mineralization of the vein is very variable, especially that of secondary U, Pb and U-Pb phases presence. Moreover, some of the phases have the origin in present or recently passed times. The aim of the investigation was to determine the contents of radioisotopes in the primary and secondary mineralization with the help of non-destructive and destructive methods of alpha spectrometry. The dating of secondary mineral phases was provided on the basis of radioactive disequilibrium of 230 Th /234 U radionuclides. Non-destructive alpha spectrometry was selected for its simplicity as a method eligible for qualitative analyses of the enormous number of samples. During the quantification of the results of non- destructive alpha spectrometry, the activities, radioisotopic concentrations and isotopic ratios of 238 U/226 Ra and 210 Po/226 Ra were calculated. The method applied on the whole set of samples was verified by reference materials CRM 129-A (uranium oxide) and BL-5 (uranium ore). Uranium and uranium equivalent concentrations of its daughter products in...
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See also: similar author names
10 Nemec, Matej
10 Nemec, Matěj
15 Nemec, Miroslav
18 NĚMEC, Martin
1 NĚMEC, Michael
17 NĚMEC, Michal
5 Němec, Marek
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10 Němec, Matěj
17 Němec, Michal
7 Němec, Milan
4 Němec, Miloš
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