National Repository of Grey Literature 19 records found  1 - 10next  jump to record: Search took 0.00 seconds. 
Modeling of meteorite impact
Takáč, Marian ; Kletetschka, Günther (advisor) ; Kohout, Tomáš (referee)
In Febuary 2013, in spectacular light and sound accompaintmen a meteorite hit the Russian Federation. Small fragment which landed in populated areas caused together with blust wave damage. The largest part broke the ice crust on the lake in outskirts of Chebarkul. The circular shaped hole gave rise to various conspiracy theories. About half of the year after impact the meteorite was lifted and conspiracy theories boken. The event immediately raised interest in the issue of the impacts of meteorites and phenomena associated with them. Processes when the meteor is passing trough atmosphere, impact craters, their origin and characteristics, computer models, types of meteorites and their origin. Or just a mystery of the hole in the ice crust of the lake Chebarkul. Science has got answers for such toppics. This paper is just trying to summarize them.
Nature of magnetic anomalies on Moon, sample analysis
Kameníková, Tereza ; Kletetschka, Günther (advisor) ; Blecha, Vratislav (referee)
The magnetic properties of a rocks on Earth are mostly well known. But what is the magnetic properties of a rocks which originate extraterrestrial? Such as on Moon. We are interested in the intensity of paleofield of some Moon rocks which were chipped by Apollo 15 in early 70s. The text is an unification of the basic knowledge of a magnetism, the way how it originates. You can found here also the basics of paleomagnetism and methods how the rocks can get own magnetisation, their properties and some outline how the Moon rocks can get own magnetisation if moon doesn't have a dynamo. Then we summaries the information got from measurements of two Moon rocks 15404.219 and 15445.277, which were divided to subsamples and measured in Paleomagnetic laboratory in Czech Academy of Sciences. Each subsample was measured separately on 2G cryogenic magnetometer. We were interested in AF (alternating field) remanent magnetisation spectra from which we got an estimating intensity of paleofield from which the samples got own magnetisation. The final part is devoted to discussion on topic of possible existence of lunar dynamo or other possibilities how the Moon rocks can have held the magnetisation.
Magnetometrical and spectrometrical analyses of fly ashes from the areas with emissonal air pollution mainly from automobile traffic (near Prague's D0 motorway) and from industry (near Ostrava's iron-mills) with a use of meteorological data
Hrušková, Gloria ; Petrovský, Eduard (advisor) ; Kletetschka, Günther (referee)
The content of analytical part of this thesis is the study of airborne dust samples collected in places with its higher concentration: by the Prague Ring (D0 motorway) and near the Ostrava's iron-mills. In both places, automobile transportation or industrial production are the primary sources of particulate matter emissions in the air. Received samples of PM1, PM2, PM10 a TSP filters were obtained by a standard air pollution monitoring procedure. This study examines the relationship between the magnetic parameters of the samples, their level of concentration of metals frequently present in emissions from these sources, the total mass of the dust fraction in the samples and the meteorological parameters (for Ostrava samples). The magnetic properties of the filters were investigated by magnetometric analyzes using a vibration sampling magnetometer. The concentrations of the metals were monitored by X-ray fluorescence spectrometer, the weight of parts of dust filtres was measured on laboratory scales.
Paleomagnetic record of basaltic lava flows on Nelson Island, Antarctica
Haislová, Radka ; Kletetschka, Günther (advisor) ; Pruner, Petr (referee)
Paleomagnetism is geophysical method for determination of former magnetic field orientation on the Earth using measurement of remanent magnetisation of rocks. Combined with radiomagnetic datingk paleomagnetism enables study of time evolution of the magnetic field on the Earth and/or reconstruction of former positions of litospheric plates. This thesis is elaborates on paleomagnetic record of basalt lava flow on the Nelson's Island in Antarctica and summarizes geological data. In the research part of this thesis theory of magnetism is introduced and the paleomagnetism method is emphasized. Additionaly, I provide a short review of magnetic minerals, that can occur in basalt. These mineral can potentialy hold some information about the character of magnetic field of the geological past. Radiometric dating methods are included as atool for determination of absolute age of solidification of ingenous rocks (lava). Specifically, the K-Ar and Ar-Ar dating methods are emphasized. The regional section of this thesis conntains geological overview about the Antarctica and the Nelson's Island with its surroundings.Included is a section about the laboratory devices for measuring vector magnetisation of oriented rock samples (for example rotational and cryogenic magnetometer). The thesis is concluded with its...
Separation of induced and remanent sources of magnetic anomalies on the Moon
Vávra, Ondřej ; Kletetschka, Günther (advisor) ; Valenta, Jan (referee)
During every full Moon our natural satellite passes through the Earth's magnetotail. For about 6 days the moon is exposed to a much stronger magnetic field, which induces magnetization in the paramagnetic and ferromagnetic minerals.. I'm trying to find a trace of these minerals in orbital magnetometric data and suggest a new way of analysing the magnetometer data suited for finding iron deposits. In the theoretical part of this work, I presented basic concepts of magnetism, described the magnetosphere, focusing on the dynamic nature of the magnetotail, which is directly influenced by the interaction of the magnetosphere with the fast moving particles of the solar wind. In the computational part, I plotted maps of the magnetometric data from the satellite Kaguya (SELENE) for times in which the Moon is in the Earth's magnetotail and reference maps from times in which the Moon is in the interplanetary magnetic field. I subtracted the data thus making a plot of the induced anomalies. I managed to confirm the occurrence of one of the anomalies in two separate magnetotail events. The induced anomaly located on the northern rim of the South Pole - Aitken Basin likely shows a signature of significant iron deposits.
Magnetic polarity in concretions
Smrčinová, Lucie ; Kletetschka, Günther (advisor) ; Adamovič, Jiří (referee)
Terrestrial iron oxides, such as hematite, goethite and magnetite, form specifically cemented concretions in sandstones using an aqueous diagenetic solution. According to the new results, the timeline on which concretions are formed could be much larger than current estimates. The basis for this claim is a magnetic record of the Jurassic Navajo Sandstone in Utah. The record contains fluctuations of remanent magnetization, which could prove the inversion of the Earth's magnetic field. This observation suggests that the time axis of the accumulation of iron concretions is comparable to the time axis of the accumulation of marine iron-manganese nodules, which contain a complex magnetic record. The occurrence of extremely slow changes in iron deposition in sandstones also helps to better understand the origin of concretions. In addition, terrestrial concretions provide an analogy for the "blueberries" found by the Mars rover Opportunity on Mars. These concretions probably underwent similar formation processes and could record inversions of the early magnetic dynamo on Mars.
Evaluation of rock masses on planetary surfaces
Boldbaatar, Dayansetsen ; Kletetschka, Günther (advisor) ; Mikuláš, Radek (referee)
The understanding of rock mass has great benefits in engineering and geology. This understanding can benefit in the field of colonizing and terraforming other planetary bodies. To achieve this task, we can begin by using current methods to see if we can evaluate rock mass and if these can be inferred to understanding rock mass on other planetary bodies. Therefore, this bachelor's thesis is sought to examine if the use of compositional and volume information in order to figure out the mass of a rock pebbles on planetary bodies. For this purpose, 3D computing Photogrammetry method and X-ray Fluorescence methods were used to derive the necessity physical quantities for the mass computing. Five rocks where used in this study. Data was collected and analyzed using the two methods, software program and instruments. The results showed use of the two methods were accurate and efficient. Compare to the classic methods, these two methods proved as efficient and accurate.
Evaluation of rock masses (pebbles) on planets
Boldbaatar, Dayansetsen ; Kletetschka, Günther (advisor) ; Mikuláš, Radek (referee)
This research is science engineering topic based on compositional and volume information to figure out the mass of a rock pebbles on a planetary surface. For this purpose, 3D computing Photogrammetry method and X-ray Fluorescence methods were used to derive the necessity physical quantities for the mass computing First section discusses the moon, its characteristics and possibility of terraforming. The second half of this bachelor's thesis is focused on modeling and its techniques. The final part summarizes the results derived from modeling chapter.
Magnetic record of conretions
Smrčinová, Lucie ; Kletetschka, Günther (advisor) ; Adamovič, Jiří (referee)
Abstact The submitted bachelor thesis is focusing on the analysis of emergence of the concretion samples, which were discovered in recent years on the location of Jurassic Navajo Sandstone in Utah, and simultaneously their comparison with concretions found during exploration of Mars on the place Meridiani Planum. The major objective of this study is to compare the condition of origin and to search possible similarities. Terestrical concretions of iron oxid maintain diagenetical record of interaction between underground water flow and sandy material. Based on the input parametres, observed here, numerical and laboratory simulations were performed, leading to explanation of an image about growth of these spherules. Important factors during precipitation of nodules is concentation, flux and time. The experiment with reactions of ferrous sulfate, iron nitrate and potassium hydroxid shows the process of precipitation and maturation of hydrated iron around nucleation center of cencretion. Comparison laboratory results, numerical simulations and found samples helps to understanding to emergence of iron concretionson Mars in a certain chemical and hydrological environment. The importance of this contribution is, that on the basis of knowledge research about concretions, their both magnetical and geochemical...
Magnetometrical and spectrometrical analyses of fly ashes from the areas with emissonal air pollution mainly from automobile traffic (near Prague's D0 motorway) and from industry (near Ostrava's iron-mills) with a use of meteorological data
Hrušková, Gloria ; Petrovský, Eduard (advisor) ; Kletetschka, Günther (referee)
The content of analytical part of this thesis is the study of airborne dust samples collected in places with its higher concentration: by the Prague Ring (D0 motorway) and near the Ostrava's iron-mills. In both places, automobile transportation or industrial production are the primary sources of particulate matter emissions in the air. Received samples of PM1, PM2, PM10 a TSP filters were obtained by a standard air pollution monitoring procedure. This study examines the relationship between the magnetic parameters of the samples, their level of concentration of metals frequently present in emissions from these sources, the total mass of the dust fraction in the samples and the meteorological parameters (for Ostrava samples). The magnetic properties of the filters were investigated by magnetometric analyzes using a vibration sampling magnetometer. The concentrations of the metals were monitored by X-ray fluorescence spectrometer, the weight of parts of dust filtres was measured on laboratory scales.

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