On Cauchy problem for the equations of reactor kinetics.

summary:In this paper, the initial value problem for the equations of reactor kinetics is solved and the temperature feedback is taken into account. The space where the problem is solved is chosen in such a way that it may correspond best of all to the mathematical properties of the cross-section models. The local solution is found by the method of iterations, its uniqueness is proved and it is shown also that existence of global solution is ensured in the most cases. Finally, the problem of mild solution is discussed

Možnosti využití odpadních vodárenských kalů

This paper deals with the sludge that is produced within the treatment of water and production of drinking water. When alumina and iron coagulants are used for coagulation and clarification of surface water, mainly alumina and iron sludge are produced. This paper describes possible alumina recovery in the water treatment procedure and re-use of sludge for treatment of municipal wastewater. The sludge can be also used for production of cement. All those actions decrease the quantity of wastes and contribute to environmental protection. The waste sludge can be also used as secondary raw materials.Tento příspěvek se zabývá kaly, které vznikají v procesu úpravy vody na vodu pitnou. Jde zejména o hlinité a železité vodárenské kaly vzniklé při úpravě povrchových vod koagulací a čiřením za použití železitých a hlinitých koagulantů. Jsou uváděny možnosti využití hliníku zpět v procesu úpravy vody, využití kalů při čištění městských odpadních vod. Využití kalů při výrobě cementu. Důvodem pro takové postupy je snižování objemu odpadu, a tím ochrana životního prostředí. Dále pak využití odpadních kalů jako druhotné suroviny

Creating an Exhibition, a Political Narrative, or Both? Reflections on the Redesign of a Museum and Memorial Space at the Nazi Execution Site in Pardubice

From 1998 to 2009, the Czech Republic implemented the programme "Rehabilitation of Memorials of the Struggle for Freedom, Independence and Democracy". The financial expenditure was intended for the rehabilitation and historical-political reorientation of memorials that, until 1989, had been appropriated to promote the communist regime. The programme included seven major memorials (including the Nazi ghetto and Gestapo detention centre Theresienstadt, and the village of Lidice, which was destroyed in 1942 and its inhabitants murdered as a ‘reprisal’ for the assassination of Reinhard Heydrich)

Some solutions to respond climate change for the Mekong Delta, Viet Nam

In the recent decades, the Mekong River Delta has suffered quite significant impacts of climate change. Fluctuations of weather elements and sea level rises have caused adverse changes, namely: the appearance of unusual high and low levels of annual floods, more and more intense storms, more severe droughts, forest fires, river erosion, cyclones, and tidal surges appear increasingly more dangerous. Traditional adaptation measures to the environmental conditions may be unsuitable in the context of climate change in the Mekong River Delta. This paper summarizes some of the new adaptation measures that scientists and policy planners have proposed for the area to cope with the negative impacts of climate change

Information System for Oriflame Cosmetics Sellers

Cílem této bakalářské práce je vytvořit informační systém pro prodejce kosmetiky Oriflame. Popisuje základní funkce a vlastnosti databází, dále jsou zachyceny běžně používané technologie pro tvorbu dynamických webových stránek - PHP, Javascript. Další kapitoly se zabývají analýzou a návrhem informačního systému. Závěrečná část práce popisuje samotnou implementaci navrženého systému.The goal of this bachelor's thesis is to create the information system for Oriflame cosmetics sellers. It describes basic functions and properties of the databases, further the commonly used technologies for dynamic web pages creation are presented - PHP, Javascript. The following chapters deal with the analysis and proposition of the information system. The final part of the work describes the implementation of the designed system itself.

Testing the impact of waste from anaerobic digestion (enriched with an organic component on the quality of agricultural land)

Waste from anaerobic digestion is considered as a mineral fertilizer and it is usually applied to agricultural land. The aim of our attempt was to enrich this waste from anaerobic digestion (digestate) with an organic component (in our case represented by haylage). For this purpose, we made different mixtures of digestate and haylage in different weight ratios. In the field trial, the effect of these mixtures on the soil, under standard agricultural conditions, was monitored. Selected accessible nutrients (P, K, Mg, Mn, Ca) and the amount of carbon and nitrogen in the soil were monitored. The results of the laboratory tests confirmed that the areas where the sowing and digestate mixtures were applied showed greater amounts of macro- and micronutrients in plant-accessible forms than the surface fertilized only with digestate or areas fertilized only with standard fertilizers

Contribution to the study of flocculation of digestate

The paper deals with the intensification of separating the solid phase of digestate using flocculants only. The separated solid phase should subsequently be used in agriculture for fertilising. Flocculants (polyacrylamides) are difficult to biodegrade. In this respect, they should not deteriorate the properties of the solid phase and the flocculant dose must be as low as possible. The research aimed to identify the optimal cationic flocculant and its application procedure which would enable a dosage that would be both economically and ecologically acceptable. We tested 21 cationic flocculants of different charge density and molecular weight and 1 mixture of two selected flocculants (Sokoflok 53 and Sokoflok 54) with the aim to discover the lowest possible dose of flocculating agent to achieve the effective aggregation of digestate particles. The lowest flocculant doses were obtained using the mixture of flocculants labelled Sokoflok 53 and Sokoflok 54 in 4:1 proportion, both of a low charge density and medium molecular weight, namely 14.54 g/kg of total solids for a digestate from the biogas plant Stonava and namely 11.80 g/kg of total solids for a digestate from the biogas plant Vrahovice. The findings also reveal that flocculation is most effective during two-stage flocculant dosing at different mixing time and intensity

Dominant eigenvalue problem for positive integral operators and its solution by Monte Carlo method

summary:In this paper, a method of numerical solution to the dominant eigenvalue problem for positive integral operators is presented. This method is based on results of the theory of positive operators developed by Krein and Rutman. The problem is solved by Monte Carlo method constructing random variables in such a way that differences between results obtained and the exact ones would be arbitrarily small. Some numerical results are shown