National Repository of Grey Literature 21 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Geochemistry and petrology of plagiogranites from the Jílové belt
Santolík, Václav ; Ackerman, Lukáš (advisor) ; Jelínek, Emil (referee)
This thesis is focused on the study of the subvolcanic rocks from the northern part of the Jílové belt. The Jílové belt is a strip of magmatic rocks belonging to the Davle Volcanic Complex situated in the center of the Bohemian Massif, south of Prague, close to the border between the Teplá-Barandian and Moldanubian units. The sub-volcanic facies of its northern part has been previously ascribed to trondhjemite, alaskite or plagiogranite. In this study, we provide new geochemical data such as major and trace element analyses paralleled by Sr-Nd isotopic data, which indicate the origin of these rocks in the mantle wedge. They probably represent a final product of a magmatic differentiation of an island arc series. Here, we consider two possible models for their origin, according to which we could also choose the correct classification of these peculiar rocks: adakite, or plagiogranite. Adakites are rocks formed by melting of a subducted slab which are predominantly related to the volcanic arc settings. In comparison, plagiogranites are rocks formed by an extreme differentiation of a mantle- derived basaltic melt in the oceanic crust environment. Our new geochemical data, especially the low degree of light rare earth enrichment (LaN/YbN = 0.8-1.3), is clearly inconsistent with the genetic association...
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...
Geochemical and Ecological Aspects of Trace Elements Content in Macrofungi
Borovička, Jan ; Jelínek, Emil (advisor) ; Hofmeister, Jeňýk (referee) ; Kalač, Pavel (referee)
l.INTRODUCTION Fungi have important biogeochemical roles in the biosphere and are intimately involved in the cycling of elements and transformations of both organic and inorganic substrates (Gadd 2007, Fig. r). The research area of geomycology is focused on the interactions of fungi with geological environment. T^-:-. -'r | ě|ola I I K. <..'---tt-\ \ Organic acid anion Figure l. Proton- and organic acid ligand-mediated dissolution of metals of soils componets and minerals (Gadd 2004). proton release resurts in cation exchange with sorbed metal ions on clay particles, colloids etc. and metal displacement from mineral suďaces. Released metals can interact with biomass and also be taken up by other biota, and react with other environmental components. organic acids anions, e.g. citrate, may cause mineral dissolution or removal by complex formation. Metal complexes can interact with biota as well as environmental constituents. In some circumstances, complex formation may be followed by crystalization, e.g. metal oxalate formation. Many macrofungal species (macromycetes, mushrooms) are capable of accumulating high concentrations of certain trace elements (includini hear,y tr \ \ -=-r Hm Mgt- metals, noble metals and metalloids) in fruit-bodies and thereby affect elemental geochemical cycling. Many studies...
Properties of cementitious matrix in the environment of radioactive waste respositories
Podojil, Adam ; Jelínek, Emil (advisor) ; Kozlovcev, Petr (referee)
Cementitious materials will serve as a construction and filler material for the construction of a deep repository of radioactive waste. Therefore, three different materials represented by four samples were studied in the present work. This is CEM II AS 42,5R cement commercially available in Čížkovice, cement CEM III B / 32,5 SV with ash and aggregate used as filler concrete for storage chambers from radioactive waste repository Richard and cement CEM I 42, 5 with fine and coarseraggregate used for fixed radioactive waste (RAW) in Velké Zbytky in the area of ÚJV Řež,as Chemical (silicate analysis) and phase composition (XRD powder diffraction analysis) were determined in the studied materials. Further, the orientation strength of the monolithic samples and their mutual comparison (compression strength measurement) were determined. Percolation leaching experiments were carried out, three columns with CEMII, RICHARD and ÚJV samples were run. The conditions of the experiments were chosen to approach the conditions in the rock environment of a possible deep radioactive waste repository. Synthetic granite water (SGW) was used as the leaching solution. In all column experiments, attempts to observe changesin the concentrations of selectedindicators (Na+ , K+ , OH- ,Ca2+ ,pH, Conductivity, SiO2, Mg2+ and...
Slate gas and the future of its energy exploitation
Šindler, Matěj ; Přibil, Rudolf (advisor) ; Jelínek, Emil (referee)
First part of bachelor thesis introduces the concept of shale gas - what is the nature of the gas, why it is called shale, etc. Then there is described the technology of mining and acquisition of gas. Another chapter informs about shale gas reserves in the world, its importance and the planned career intentions. Very important part of this work is to look at the impacts of extraction of this gas, in particular climate change, water and soil pollution, impacts on the population, but also other phenomena, such as earthquakes caused by the extraction of this shale gas. The last part is the chapter on the current situation of shale gas exploration in the Czech Republic. At the conclusion, the whole situation regarding shale gas is evaluated and my own views on this extraction are presented.
Slate gas and the prospects of its energy exploitation
Šindler, Matěj ; Přibil, Rudolf (advisor) ; Jelínek, Emil (referee)
First part of bachelor thesis introduces the concept of shale gas - what is the nature of the gas, why it is called shale, etc. Then there is described the technology of mining and acquisition of gas. Another chapter informs about shale gas reserves in the world, its importance and the planned career intentions. Very important part of this work is to look at the impacts of extraction of this gas, in particular climate change, water and soil pollution, impacts on the population, but also other phenomena, such as earthquakes caused by the extraction of this shale gas. The last part is the chapter on the current situation of shale gas exploration in the Czech Republic. At the conclusion, the whole situation regarding shale gas is evaluated and my own views on this extraction are presented.
Trace element and Re-Os geochemistry of mantle pyroxenites from the Bohemian Massif
Haluzová, Eva ; Ackerman, Lukáš (advisor) ; Jelínek, Emil (referee)
Mantle pyroxenites are important components of mantle rocks, because they provide important insights into bulk composition and heterogeneity of the Earth's upper mantle and therefore, direct evidence of mantle evolution throughout the Earth history. Studied pyroxenites from localities Bečváry (the Kutná Hora Complex), Níhov, Nové Dvory, Mohelno, Horní Kounice, Karlstteten and Meidling (the Gföhl Unit of the Moldanubian Zone) occur as dykes and/or layers within spinel and garnet peridotites from the Bohemian massif. Whole-rock concentrations of rare earth (REE) and other trace elements in studied pyroxenites yield extreme variability, which most likely reflect: 1) variable garnet/clinopyroxene ratios in bulk rocks, 2) different degree of fractionation of parental melts and 3) different concentrations trace elements in the source host material. Pyroxenites from locality Mohelno (LREE-depleted) may be derived from depleted or only slightly enriched suboceanic mantle. In contrast, pyroxenites from Karlstetten, Meidling, Horní Kounice and Nové Dvory (LREE-enriched) crystallized from the melts derived from enriched mantle source with possibly significant contribution of recycled crust. Studied pyroxenites are characterized by extremely variable 187 Os/188 Os ratios. While the pyroxenites from Mohelno and...
Study of interaction between engineering barriers of deep repository of spent nuclear fuel and radioactive waste
Podojil, Adam ; Jelínek, Emil (advisor) ; Kozlovcev, Petr (referee)
The thesis describes the different types of radioactive wastes (RAW), it present classification used in Czech Republic (classification of RAW isn't unified but vary according to the needs of the region for which is created. Trend of recent years in RAW disposal aimed at building a deep repositories in suitable geological formations. So it is in Czech Republic where it is planned to build repository in granitic rocks similar to the Swedish model KBS-3V/KBS-3H. This model is based on multi-barrier system which serves to maintain radionuclides outside the environment for at least 100,000 years. The system consist of engineered barriers (waste form, storage overpack, bentonite and cement) and natural barriers (rock environment in the vicinity of deep depository (near field, far field)). Study of interactions of various barriers is an important factor in the development of appropriate forms of final storage. The interactions at interface bentonite-corrosion products of container and cement- bentonite are important in terms of functionality barriers over time. In the long run, there are many changes in the properties of the individual interacting barriers. At the interface bentonite-steel shell of the container when progressing corrosion occurs to the formation of secondary minerals (magnetite, siderite,...

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