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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Growth of photonic single crystals by floating zone method
 Zajíc, František ; Pospíšil, Jiří (advisor) ; Bárta, Jan (referee)
Photonic single crystals have important industrial application as laser gain mediums or scintillation detectors. Nowadays, photonic single crystals are industrially grown exclusively by the Czochralski method, laboratory preparation is done by the micro-pulling-down method. Both of these methods are crucible methods and therefore have fundamental limitations, especially with regard to the high melting point of materials and the atmosphere in which crystals can grow. This thesis deals with testing of the preparation of Nd:YAG single crystals by the floating zone method in a halogen mirror and laser furnace, which are free of these limitations. The result of 17 performed growths is a tuned process of reproducible growth of high-quality Nd:YAG single crystals and significantly improved furnace instrumentation. We characterized the samples and verified that they are comparable in quality to industrially produced single crystals. The gained experience is already used for the growth of other compositions of optically active materials.
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Covid news of on-line media during the first strifke of an epidemic in the Czech Republic
 Zajíc, František ; Moravec, Václav (advisor) ; Trunečka, Ondřej (referee)
This thesis focus to research how selected online media informed about the first wave of coronavirus SARS-CoV-2 epidemic in the Czech Republic. Specifically, this thesis focus on the signs of media panic (hysteria) in the news pieces of selected media, their frequency, proportion and manner of use. The media's content was analyzed by content analysis and some of this content was then analysed by discursive analysis. The research showed that the coverage of the spread of coronavirus dominated the media space. All selected media used elements of media panic in their news pieces, which could have effect society. The research further showed that in the use of these elements, there was not a hypothetical difference between the tabloid media and the self-declared serious media.
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