National Repository of Grey Literature 101 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Silica sinter as a source of paleoenvironmental information
Sobek, Ondřej ; Hošek, Jan (advisor) ; Rapprich, Vladislav (referee)
Hydrotermální prameniště s alkalicko-chloridovými a SiO2 přesycenými vodami jsou ojedinělým typem terestrického prostředí, vyznačujícím se tvorbou chemogenního sedimentu, nazývaného křemenný sintr. Na termálním a chemickém gradientu, od ústí vývěrů až po distální části prameniště, lze vyčlenit několik litofaciálních typů křemenných sintrů (např. gejzírit, packed fragmental sinter, palisádový sintr aj.), jejichž výsledná textura je ovlivněna řadou abiotických a biotických faktorů. Ve vzdálenějších oblastech od hydrotermálních vývěrů se nachází mokřadní prostředí s druhově pestrým zastoupením vyšších rostlin a asociované fauny. V těchto částech hydrotermálního systému vzniká tzv. plant-rich sinter, který umožňuje studovat anatomii silicifikovaných rostlin a dalších organismů na velmi vysoké úrovni, což činí tuto litofacii cenným zdrojem paleobotanického materiálu a paleoenvironmetnálních informací. Předkládaná práce poskytuje ucelený přehled o křemenných sintrech s důrazem na využití těchto specifických sedimentů při rekonstrukci lokálních paleoenvironmentálních podmínek. Klíčová slova: hydrotermální prameniště, křemenný sintr, silicifikace, rostlinný materiál, paleoenvironmentální rekonstrukce
Paleoenvironmental evolution around Lake Ohrid in the context of ancient settlement
Koubský, Karel ; Hošek, Jan (advisor) ; Abraham, Vojtěch (referee)
Lake Ohrid, the oldest lake in Europe, is an ideal place to study the response of the terrestrial ecosystems to many climatic and environmental changes during the Quaternary. It is also a useful source of information regarding the interactions between man and environment during the Holocene - this applies especially to the Late Bronze Age period and the beginning of the Iron Age, when there were profound changes in landscape management and when lakeside settlements were suddenly abandoned, which is also evident in the palaeobotanical record. This work summarizes the existing knowledge on this issue and presents various possibilities for studying paleoenvironmental development in this area. Key words: Holocene - Lake Ohrid - paleoenvironmental reconstruction - settlement - Bronze Age
Upper Pleistocene environmental dynamics in central Europe: multidisciplinary research of loess/paleosols sequences and lacustrine sediments
Hošek, Jan
The principal goal of this thesis was to provide relevant information on the spatiotemporal dynamics of erosion-sedimentation and weathering processes in the last climatic cycle and to interpret the obtained data in the context of European paleoenvironmental development. Representative sequences of loess, paleosols and lacustrine sediments from the area of the Bohemian Massif, the Carpathian Foredeep, the the Vienna Basin and the northern edge of the Panno-nian Basin were investigated using a wide range of instru-mental tools and paleontological methods. A uniform analytical approach applied to these sedimentary facies has provided ample new information about the paleoclimatolog-ical and paleoenvironmental development of East-Central Europe - an important region in the transition zone from oceanic to continental macro-climatic settings. The individu-al studies included in this PhD thesis cover the complete period of the Upper Pleistocene (MIS 5-2; ~130-12.7 ky BP) and are presented as separate chapters in the order of the superposition of strata. Chapters III/1-3 deal with the results of research into six loess/paleosol sequences (LPSs) situated in the Central Bohemian Massif, throughout the Moravian Valleys, and at the northwest and north edge of the Pannonian Basin. A detailed paleoenvironmental...
Upper Pleistocene environmental dynamics in central Europe: multidisciplinary research of loess/paleosols sequences and lacustrine sediments
Hošek, Jan
The principal goal of this thesis was to provide relevant information on the spatiotemporal dynamics of erosion-sedimentation and weathering processes in the last climatic cycle and to interpret the obtained data in the context of European paleoenvironmental development. Representative sequences of loess, paleosols and lacustrine sediments from the area of the Bohemian Massif, the Carpathian Foredeep, the the Vienna Basin and the northern edge of the Panno-nian Basin were investigated using a wide range of instru-mental tools and paleontological methods. A uniform analytical approach applied to these sedimentary facies has provided ample new information about the paleoclimatolog-ical and paleoenvironmental development of East-Central Europe - an important region in the transition zone from oceanic to continental macro-climatic settings. The individu-al studies included in this PhD thesis cover the complete period of the Upper Pleistocene (MIS 5-2; ~130-12.7 ky BP) and are presented as separate chapters in the order of the superposition of strata. Chapters III/1-3 deal with the results of research into six loess/paleosol sequences (LPSs) situated in the Central Bohemian Massif, throughout the Moravian Valleys, and at the northwest and north edge of the Pannonian Basin. A detailed paleoenvironmental...
Upper Pleistocene environmental dynamics in central Europe: multidisciplinary research of loess/paleosols sequences and lacustrine sediments
Hošek, Jan ; Lisá, Lenka (advisor) ; Nývlt, Daniel (referee) ; Ložek, Vojen (referee)
The principal goal of this thesis was to provide relevant information on the spatiotemporal dynamics of erosion-sedimentation and weathering processes in the last climatic cycle and to interpret the obtained data in the context of European paleoenvironmental development. Representative sequences of loess, paleosols and lacustrine sediments from the area of the Bohemian Massif, the Carpathian Foredeep, the the Vienna Basin and the northern edge of the Panno-nian Basin were investigated using a wide range of instru-mental tools and paleontological methods. A uniform analytical approach applied to these sedimentary facies has provided ample new information about the paleoclimatolog-ical and paleoenvironmental development of East-Central Europe - an important region in the transition zone from oceanic to continental macro-climatic settings. The individu-al studies included in this PhD thesis cover the complete period of the Upper Pleistocene (MIS 5-2; ~130-12.7 ky BP) and are presented as separate chapters in the order of the superposition of strata. Chapters III/1-3 deal with the results of research into six loess/paleosol sequences (LPSs) situated in the Central Bohemian Massif, throughout the Moravian Valleys, and at the northwest and north edge of the Pannonian Basin. A detailed paleoenvironmental...
Evalution of Transfection Methods for Transfection of COS-7 Cells
Slavík, Jan ; Hošek, Jan (referee) ; Rychtárik, Milan (advisor)
The aim of this work is summarized potentialities of cells transfection in their practise, which offers the Department of biomedical engineering. On COS-7 cell line are compared to those transfection reagents: calcium phosphate, Fugen 6 and Fugen HD.
Improvements of the experimental apparatus for measurement of the surface tension of supercooled liquids using horizontal capillary tube
Vinš, Václav ; Hošek, Jan ; Hykl, Jiří ; Hrubý, Jan
An experimental apparatus with a horizontal capillary tube for measurement of the surface tension of supercooled liquids was designed and tested in the previous study [V. Vinš et al., EPJ Web Conf. 92, 02108 (2015)]. In this work, recent modifications of both the experimental setup and the measurement analysis are described. The main aim is to improve the accuracy and the reproducibility of measured surface tension and to achieve higher degrees of supercooling. Among other modifications, the optical setup observing the liquid meniscus at the open end of the horizontal capillary tube together with the video analysis were thoroughly revised. The modified apparatus was used for the measurement of surface tension of supercooled water at temperatures down to – 11 °C. The new data have a lower scatter compared to the previous horizontal measurements and show a good agreement with the other data obtained with a different measurement technique based on the modified capillary rise method.

National Repository of Grey Literature : 101 records found   1 - 10nextend  jump to record:
See also: similar author names
24 Hosek, Jiri
4 Hošek, Jakub
2 Hošek, Jaromír
24 Hošek, Jiří
1 Hošek, Josef
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