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Study of fossil wood by modern analytical methods: case studies
Matysová, Petra ; Sakala, Jakub (advisor) ; Soták, Ján (referee) ; Dietrich, Dagmar (referee)
Silicified woods belonging to the three-dimensional permineralised plants are thoroughly studied by palaeobotanists. Their importance is usually underestimated in other scientific disciplines, their mineralogy/geochemistry is poorly known in close relation to other known scientific data. Stone-like appearance and nature of silicified wood is valued mainly in mineralogical markets. Only a complex analytical view can reveal more about their taphonomic past, palaeoenvironments and mechanisms of their formation and preservation. This PhD thesis aims to uncover the potential of instrumental analyses of permineralised woods and design remarkable procedures of observing the wood samples. I have performed petrographical and geochemical analyses and comparison of samples of the Pennsylvanian (Carboniferous) to the Late Triassic age from several localities in the Czech Republic, Germany, Brazil, Sultanate of Oman, Mongolia, USA - Arizona, France, and Antarctica. The selected samples, in most cases taxonomically determined, were observed in qualitative and quantitative way by instrumental imaging and analytical tools. Bulk (XRD) and detailed point analyses were performed. As the samples are very old, the crystallinity of SiO2 was high (α-quartz was their main constituent according to XRD). A rather rare...
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Permo-Carboniferous silicified trunks from Intra-Sudetic and Krkonoše-Piedmont Basins: Taxonomy and Instrumental Analysis
Matysová, Petra
Silicified woods of the Permocarboniferous abundantly occur in a Czech part of the Intra Sudetic Basin and Krkonoše Piedmont Basin. They grew in Westphalian and Stephanian, about 300 million years ago. They were firstly mentioned in the second half of the 19th century. Exactly speaking, they represent silicified stems of the Permocarboniferous arborescent plants that belong to five palaeobotanical divisions of evolution grades Pteridophyta and Gymnosperms. There are still a lot of unanswered questions related to the origin of this silicified wood. One aim of this work is to describe the way of silicification which would be best suited to environmental conditions in these two basins. Up to now, the relationship between the actual anatomy of the wood and a specific way of their permineralization has not been clarified from the petrographic point of view. Thin sections of silicified stems were first studied by light and polarized-light microscopy and then cathodoluminescence spectroscopy and electron microscopy with EDX analysis. Differences in quartz crystallinity in individual original plant tissues have been obvious, e.g., macro- and microquartz crystals were present, mostly respecting structures of plant tissues, spherulitic chalcedony sometimes crystallizing irrespectively of these tissues, and...
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Study of fossil wood by modern analytical methods: case studies
Matysová, Petra ; Sakala, Jakub (advisor) ; Soták, Ján (referee) ; Dietrich, Dagmar (referee)
Silicified woods belonging to the three-dimensional permineralised plants are thoroughly studied by palaeobotanists. Their importance is usually underestimated in other scientific disciplines, their mineralogy/geochemistry is poorly known in close relation to other known scientific data. Stone-like appearance and nature of silicified wood is valued mainly in mineralogical markets. Only a complex analytical view can reveal more about their taphonomic past, palaeoenvironments and mechanisms of their formation and preservation. This PhD thesis aims to uncover the potential of instrumental analyses of permineralised woods and design remarkable procedures of observing the wood samples. I have performed petrographical and geochemical analyses and comparison of samples of the Pennsylvanian (Carboniferous) to the Late Triassic age from several localities in the Czech Republic, Germany, Brazil, Sultanate of Oman, Mongolia, USA - Arizona, France, and Antarctica. The selected samples, in most cases taxonomically determined, were observed in qualitative and quantitative way by instrumental imaging and analytical tools. Bulk (XRD) and detailed point analyses were performed. As the samples are very old, the crystallinity of SiO2 was high (α-quartz was their main constituent according to XRD). A rather rare...
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Permo-Carboniferous silicified trunks from Intra-Sudetic and Krkonoše-Piedmont Basins: Taxonomy and Instrumental Analysis
Matysová, Petra
Silicified woods of the Permocarboniferous abundantly occur in a Czech part of the Intra Sudetic Basin and Krkonoše Piedmont Basin. They grew in Westphalian and Stephanian, about 300 million years ago. They were firstly mentioned in the second half of the 19th century. Exactly speaking, they represent silicified stems of the Permocarboniferous arborescent plants that belong to five palaeobotanical divisions of evolution grades Pteridophyta and Gymnosperms. There are still a lot of unanswered questions related to the origin of this silicified wood. One aim of this work is to describe the way of silicification which would be best suited to environmental conditions in these two basins. Up to now, the relationship between the actual anatomy of the wood and a specific way of their permineralization has not been clarified from the petrographic point of view. Thin sections of silicified stems were first studied by light and polarized-light microscopy and then cathodoluminescence spectroscopy and electron microscopy with EDX analysis. Differences in quartz crystallinity in individual original plant tissues have been obvious, e.g., macro- and microquartz crystals were present, mostly respecting structures of plant tissues, spherulitic chalcedony sometimes crystallizing irrespectively of these tissues, and...
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Financial analysis and financial plan ALBI Česká republika
Matysová, Petra ; Marek, Petr (advisor) ; Jakoubek, Jiří (referee)
This bachelor's thesis is focused on financial analysis of the Company ALBI Česká republika a. s., which is performed between 2008 and 2012. The next aim is to outline expected future development. In the first part of this thesis the specific methodology, that will be used in the financial analysis, is described. The second part contains horizontal and vertical analysis, calculation of ratio indicators, including comparison with competitors, testing the financial health with bankruptcy and creditworthy model and finally drawing up a short-term financial plan that includes a planned profit and loss statement and a planned balance sheet.
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