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Limnologický výzkum šumavských jezer na sklonku 20. století
Vrba, Jaroslav ; Kopáček, Jiří ; Fott, J. ; Hartman, Petr ; Hejzlar, Josef ; Komárková, Jaroslava ; Macek, Miroslav ; Nedoma, Jiří ; Straškrábová, Viera ; Šimek, Karel
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Recent recovery of acidified lakes in the Bohemian Forest
Vrba, Jaroslav ; Fott, J. ; Kopáček, Jiří ; Kohout, L.
In some of the eight glacial lakes in the Bohemian Forest we have observed first signs of zooplankton recovery from acidity. The recovery has followed a drop in atmospheric sulphur and nitrogen deposition and consequent reversal in water chemistry of the lakes during the last decade. At present, stable populations of Ceriodaphnia quadrangula have returned to Lake Černé and Prášilské, and two circumneutral rotifers have recently occurred in the lakes with positive alkalinity: Laka, Großer and Kleiner Arbersee. Moreover, in the mesotrophic, strongly acidified Lake Plešné, we documented increase in both phytoplankton and planktonic rotifers during the 1990s. A statistical comparison of seasonal data showed a significant increase in pH, a significant drop in total reactive aluminium, a significant increase in chlorophyll a concentration as well as in summer abundance of planktonic rotifers.
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The principles of internet communities
Vrba, Jaroslav ; Mišurec, David (advisor) ; Košárek, Zdeněk (referee)
This thesis concentrates on Internet communities, shows their principles of working and compare the most important of them. The aim of this thesis is to explain how internet communities works. It compares their features and provide to reader a possibility of making own opinion on them. The internet communities are compared from global and local Czech aspect. This thesis shows their functionalities, benefits and from the other hand their disadvantages linked with usage, including possibilities of protection. Author attached his own research in form of questionnaire aimed on Facebook users. Next to the last chapter shows economic aspect of the community servers, what are their costs and revenues.
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Finanční analýza firmy Rekont spol. s r.o.
Pinka, Petr ; Neumaierová, Inka (advisor) ; Vrba, Jaroslav (referee)
Tato práce je hodnocením finanční výkonnosti stavební společnosti Rekont spol. s r.o. Obsahuje vertikální a horizontální analýzy účetních výkazů, poměrové a absolutní ukazatele, analýzu zadluženosti a likvidity, modely predikce finanční tísně a jejich srovnání s odvětvím. Na závěr jsou výstupy shrnuty a uvedena určitá doporučení ke zlepšení finanční situace podniku.
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