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Chromatografická analýza rostlin a produktů spojených s výrobou absinthu a testování odpadů z výroby jako možného zdroje biopesticidů
BEDNÁŘ, Jan
This thesis deals with the analysis of herbs traditionally used for the absinth production: Pimpinella anisum, Foeniculum vulgare and Artemisia absinthium. The suitable GC-MS methods were developed and validated and they were used for the determination of the volatile substances content in essential oils and dried herbs which are available at the Czech market. Another aim of this study was to determine the content of t anethole and -thujone during the distillation of absinth in both laboratory and industrial scale. Finally, distillation residues were tested on Spodoptera litoralis larvae for potential pesticidal effects at VÚRV.
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Validation of WRF-Chem and CAMx atmospheric model outputs with focusing on tropospheric ozone
Peiker, Jan ; Karlický, Jan (advisor) ; Bednář, Jan (referee)
The atmospheric model accuracy is substantially influenced by quality of boundary conditions used by physical and chemical part of the model. The thesis evaluates the development of the model output accuracy in case of using global model outputs as boundary conditions, instead of interpolated observation data (so-called reanalyses). For this purpose, two atmospheric models WRF-Chem and CAMx with three different combinations of boundary conditions were used, thus 6 simulations in total. The simulations were performed in the domain cove- ring central Europe and were compared with data from 165 stations. The results have shown narrower distribution functions of the simulated data in general and different seasonal overestimation in both models. The substitution of original boundary conditions for those adopted from global models has shown that the replacement of meteorological boundary conditions has decreased the correlati- ons between simulations and measurements, whereas the replacement of chemical boundary conditions has increased the overestimation of both models. 1
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Use of lightning data for nowcasting.
Arnoštová, Michaela ; Žák, Michal (advisor) ; Bednář, Jan (referee)
Advances in lightning detection systems and convective storm analysis techniques are im- proving our understanding of their correlation. This has been the focus of many studies in re- cent decades, and it has been shown that a sudden increase in lightning, the so-called lightning jump, often precedes the occurrence of severe weather. Based on these findings, 2σ algorithm was developed to assess the occurrence of severe weather, which this thesis builds on. The aim of this thesis was first to perform data analysis of lightning data in convective storms and then, based on the obtained results and by setting an appropriate configuration, to increase not only the success rate of the 2σ algorithm, but also to design its extension part determining the specific type of severe weather that can occur in the storm. For this purpose, 72 convective storms over central Europe were studied from 4 categories - storms without severe weather, storms with hail, with severe wind or with tornadoes. Trends in the density, height and current amplitude of each type of lightning before the onset of specific severe weather were investi- gated, and it turned out that some of these parameters show different behaviour in different storm categories. Therefore, based on the data analysis of these lightning activity parameters, an...
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Changes in selected characteristics of precipitation from convective and stratiform cloudiness
Rulfová, Zuzana ; Kyselý, Jan (advisor) ; Bednář, Jan (referee)
Significant trends in some characteristics of atmospheric precipitation have been observed in central Europe in recent decades. Little attention has been paid to the investigation whether these trends are related to changes of precipitation falling from v convective and stratiform cloudiness. This thesis deals with disaggregation of precipitation into convective and stratiform on the basis of the database of 10 SYNOP stations in the Czech Republic. The differentiated precipitation amounts were analyzed with respect to trends of total and heavy rainfall in individual seasons for the period 1982-2005. For convective precipitation in the western part of the Czech Republic, the observed trend is increasing in total precipitation, except for spring, and declining in heavy rainfall, except for fall and winter. In the eastern part of the Czech Republic, the total amounts are increasing (except for winter) and heavy rainfall is decreasing, except for spring. For stratiform precipitation, the growing trend prevails in all the characteristics of the total and heavy rainfall throughout the Czech Republic. The exception is the spring season with the downward trend.
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John Polkinghorne - his contribution to the dialogue of science and theology
Kobera, Marek ; Bednář, Jan (advisor) ; Opatrný, Aleš (referee)
ANGLICKÁ ANOTACE JOHN POLKINGHORNE - HIS CONTRIBUTION TO DIALOGUE OF SCIENCE AND THEOLOGY In this thesis we discuss the biography, the career and scientific and theological work of one of the main characters in dialogue of science and theology. We have tried to assign his theories and opinions to certain theological disciplines, although his work is mainly apologetic in its nature. We assess his role in the dialogue and set him in a wider context of other "similar" theologians and Church documents. Finally we formulate an outlook of the future developments of this particular field characterized by use of natural (scientific) theology. Keywords: John C. Polkinghorne, the nature of scientific and theological discourses, apologetics, natural theology, future trends in the dialogue between theology and natural sciences.
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