National Repository of Grey Literature 55 records found  beginprevious51 - 55  jump to record: Search took 0.01 seconds. 
Environmental tracers (18O, 3H, CFCs, SF6) exploitation for study of mean residence time and flow pattern of dripping water and karst springs (Moravian Karst)
Bruthans, J. ; Zeman, Ondřej ; Jež, M. ; Himmel, J. ; Buzek, F. ; Melková, J. ; Oster, H. ; Geršl, M.
Mean residence time and flow pattern was studied in unsaturated zone of Ochoz Cave in southern part of Moravian Karst by means of 18O in the years 2001 to 2003. The results of study showed relatively long residence time in the unsaturated zone (about 50% komponent with residence time exceeding one year). The proportion components coming from different reservoirs were computed from two components (soil/epikarst; meltwater). The results clearly indicate, that more than 50% of water (nearly 100% in 2003) in dripping waters was derived from soil/epikarst water, which originate from (late) summer precipitations (heavy 18O content)! It means that infiltrating snowmelt water was expelling (by piston flow effect) the summer water from soil and/or epikarst. Water from snowmelt was then lost by evapotranspiration in summer time. If this effect is common in Langer period, it can change composition of d18O in dripping waters and hence also in dripstones precipitating from these waters.
Souhrn měření dceřinných produktů rozpadu radonu a aerosolových částic v Bozkovských dolomitových jeskyních
Thinová, L. ; Berka, Z. ; Brandejsová, E. ; Ždímal, Vladimír ; Milka, D.
To define the calculation of the effective dose in caves, the following measurements were carried out: continual radon measurement, regular radon and daughter measurement through the sampling procedure to specify propoprtion of radon daughters, regular indoor air flow measurement to study the location of radon supply and its transfer among individual parts of the cave.
Rozdělení velikostí aerosolových částic v budovách a jeskyních a jeho vliv na určení dávky spojené s radonem
Berka, Z. ; Thinová, L. ; Brandejsová, E. ; Ždímal, Vladimír ; Froňka, A. ; Milka, D.
This paper summarized results of aerosol particles sizes spectra evaluation which has been measured directly in the Bozkov cave. These spectra are compared with the ones for residental areas and the radon-to-dose convertion factor is disscused. The correction factor (so called "caves factor") value is discussed too.
První výpočty efektivní dávky z měření dceřinných produktů rozpadu radonu a aerosolových částic v jeskyních
Thinová, L. ; Berka, Z. ; Brandejsová, E. ; Ždímal, Vladimír
The result from continual radon activity measurement, immediate radon daughter and radon activity sampling (one per month), air flow measurement, and aerosol particle size distribution determination have been taken into account of the effective dose of the permanent guides in caves. All data obtained by the carried out measurements and calculations published by J. Porstendörfer were used for more exact determination of an effective doses from radon and daughters inhalation for guides in the Bozkov cave.
Analysis of visit rate caves
Drbalová, Pavla ; Musil, Martin (advisor) ; Přibyl, Lubomír (referee)
The study aims to provide the visit rate analysis of the accessible caves in the Czech Republic. The study evaluates and parses the visit rate from time and other indicators point of view. One of the targets is also to judge, whether the reconstruction of the caves influences the visit rate.

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