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National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Ochrana krajiny a nerostného bohatství jižních Čech na příkladu vltavínů
 KOUBOVÁ, Tereza
The bachelor thesis describes the problem of devastation of the landscape mainly of the agricultural land fund and of the forest units for the purpose of extracting the moldavites. The aim of the thesis is to evaluate these negative influences on illegal diggers at selected interest sites, such as Zatáčka and Parýz near Dobrkovská Lhotka. The theoretical part closer characterizes the South Bohemian landscape, moldavites and information about them. In this thesis is further approached the nature and landscape conservation and the protection of mineral resources acording to law regulations. In the practical part, field surveys of selected localities are focused on the current problems related to the negative effects on the landscape, which formerly had the character of meadow or pasture. Now there are post-mining damages that reduce the usability of the area called Parýz There is also a good example of reclamation after illegal mining in Zatáčka locality had to end more devastation of the agricultural land fund.
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Úvodní zpráva k problematice separace plynů obsažených v bublinách ve vltavínech a jiných tektitech a stanovení chemického a izotopového složení těchto plynů (projekt GA ČR 205/09/0991)
 Žák, Karel
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Chemical composition of moldavites from the Cheb Basin and their relationship to other tektites of the Central European strewn field
 Skála, Roman
Basic physical properties (weight, shape, color and sculpture) were evaluated for over 350 individual finds of tektites from 4 different localities in the Cheb Basin. They are similar to those observed for South Bohemian moldavites. Totally, 24 tektites from the Cheb Basin and 17 from the South-Bohemian and Moravian substrewnfields have been characterized chemically using EPMA. Contents of major elements overlap between the two sample sets covering a broad range; trends observed in the Harker plots, however, seem to differentiate several partial groups. Minor and trace elements have been measured with an LA-ICP-MS technique. Preliminary 40Ar/39Ar dating shows that Cheb tektites are coeval with moldavites from South Bohemia and Western Moravia. Finding of a new moldavite substrewnfield around Cheb substantiate the theory that moldavites were ejected from the Ries impact structure in a fan-shaped jet.
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