National Repository of Grey Literature 628 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Diverzita makrozoobentosu v Evropsky významné lokalitě výskytu raka kamenáče (Austropotamobius torrentium)
The "Zákolanský potok" takes part in European nature program Special Area of Conservation because of the presence of stone crayfish (Austropotamobius torentium), which is listed as threatened species. The area around brook is intensively agriculturally cultivated. Water from wastewater treatments plants is drained to the local brooks. The aim of the work was to describe diversity of macrozoobenthos on the brook called "Zákolanský potok". Further aim was to evaluate the ecological condition of the watercourse using biotic indexes. The samples of macrobenthos were taken from three profiles in five sampling periods. Profile 1 was control, profile 2 was under the wastewater treatments plants and the third profile was placed down the stream. Diversity, biomass, saprobic index, BMWP, and ASTP scores were evaluated for the community of macrozoobenthos. The saprobic index was evaluated to the beta-mezosaprobity value (2.0-2.4) in the first profile, the saprobic index on the second profile showed a relatively wide range from worse oligosaprobity to worse beta-mesosaprobity (1.2-2.4). On the third profile, the saprobic index ranged from better beta-mesosaprobity to better alpha-mesosaprobity (1.6-2.6). The BMWP and ASPT scores in all profiles refer to medium to low quality aquatic environments. The diversity of the community gained the best values on the 3rd profile, here was found with one more taxon than on the 1st profile. With increasing organic load, diversity decreased on the 2nd profile, although a more sensitive species was found here.
Biomass and seeds production of hemp (\kur{Cannabis sativa}) grown in organic farming
Hemp is a significant oil and fibre crop that finds its use again, due to its almost 100% biodegradability, various use but also its specific features. The aim of this thesis was to evaluate the influence of the variety on hemp production and possibilities of the hemp cultivation in organic farming in different ways of its use. Five varieties of hemp (Fortuna 75, Carmagnola, KC Zuzana, KC Virtus, Felina 32) cultivated in organic farming in the Velhartice area were used for evaluating the density and the health status of the stand, plant height and diameter, yield of fibre, hurds and total biomass. We can recommend growing hemp in organic farming because hemp achieved yields similar to average production from the conventional farming system there. We can recommend KC Virtus and Felina 32 variety, which reached a high yield of achenes and inflorescences for the combined production of biomass and achenes or biomass and inflorescences. The KC Virtus variety reached the highest fibre (2.8 t/ha) and hurds production (8.3 t/ha) too.
Porovnání přístupu k bioplynovým stanicím v ČR a vybraných státech EU.
FIKAR, Miloslav
This diploma thesis focuses on biogas stations used in agriculture. The thesis is divided into two parts - the literary research and the practical part. The first part of the thesis introduces the overall description of the biogas, its production, definition, and use. Moreover, the input and output raw materials of a biogas station are described. Subsequently, the operation and the chronological procedure used during the biogas production and resulting electricity in biogas station are introduced. The practical part of the thesis focuses on the actual situation in Europe and the development of both, the biogas stations' construction and the production of electricity from biomass. This part also analyses preferred raw materials of selected countries of the EU. Electrical capacity (IEC) and a particular state subsidy policy are also mentioned in the thesis. The research also includes particular examples of a good attitude and use of biogas stations in practice. In detail, the thesis deals with how these topics are dealt with in selected countries. In the Czech Republic, Slovakia, Germany, and Poland. In conclusion, according to the ascertain data, the overall summary and prognosis for the future are introduced.
Vliv vstupní suroviny (biomasy) na výkonnost bioplynové stanice
BRŮŽEK, Vojtěch
In this bachelor thesis I focused on biomass used, biogas production, product, technological parts and station equipment and the operation of biogas stations.
Environmental aspects of japan poplar growing - greenhouse gases emissions
KAŇKA, Jakub
The aim of the bachelor thesis "Environmental aspects of japan poplar growing - greenhouse gases emissions" is to create a general overview of cultivation of fast-growing woody plants , specifically japan poplar, by literature study. Another objective is to elaborate a research focused on the environmental impact of its cultivation on greenhouse gas production, which is expressed by the production of carbon dioxide emissions (CO2 eq). For this purpose, the scope of all operations and interventions including the establishment, treatment and subsequent harvesting of the plantation was elaborated in the range of this thesis. Using these data, the total emission burden for the environment in terms of CO2 eq production resulting from the cultivation of energy crops was calculated in the SIMA - PRO program.
The Effective and Ecological Burning of Biomass
Špiláček, Michal ; Kolat, Pavel (referee) ; Masaryk, Michal (referee) ; Skála, Zdeněk (advisor)
This work deals with the creation of a numerical model of a biomass combusting chamber on a grate. The research part of this work describes the basic properties of biomass important for its combustion and the biomass combustion process itself. For this process which it is necessary to know the dynamics of the chemical reactions and the overall mechanism of a grate combustion of fuels. It also describes the production of harmful emissions that can be generated by combustion of biomass and the emphasis is mainly on the production of nitrogen oxides. In the next part is described the combustion device itself and the basic mathematical model which incorporates the mechanisms of heat transfer, flow of fluids and transport of chemical species. The basic mathematical model is then extended to a complete mathematical model by determining the initial and boundary conditions. Subsequently, the results of the computer simulation of the mathematical model are presented and commented. The main focus are the emissions of nitrogen oxides and hydrocarbons. These results are used to design an improvement of the geometry of the combustion chamber.
Heating and hot water preparation of recreation center
Hakl, Jaroslav ; Horká, Lucie (referee) ; Počinková, Marcela (advisor)
Content of this bachelor thesis is heating and hot water preparation of recreation centre in the village Ostužná, district Jeseník. Object have 2 above-ground floors. Ground floor is mainly used to meet people in play room or in common room. First floor is situated six accommodation units with private bathroom and toilet. Technical facilities are situated in ground floor and is consists of boiler room and the adjacent fuel storage. For heating is primary used grasifying boiler. Secondary source for hot water preparation is solar systém, that is supplemented by an electric heater in the absence of sunshine. Heating systém is in horizontal double-pipe version with distributor and collector in each floor. The Individual branches on the distributor and collector connected are sections of a single accommodation unit, that can be individually regulated. Radiators are designed as boards in the VK design.
Boilers for solid fuel
Zezulka, Patrik ; Kudela, Libor (referee) ; Baláš, Marek (advisor)
This bachelor thesis deals with the heating of houses with boilers for solid fuels. Thesis is divided into several parts. In the first part is dealt with most common solid fuels, their characteristics, composition and modifications for house heating. The second part is focused on solid fuel boilers, describes chosen boilers, their operation, their advantages and disadvantages. In the last part is economically assessed the suitability of selected solid fuel boilers for heating the model house.
Energy use of agropellets
Zahnaš, Ladislav ; Lisý, Martin (referee) ; Baláš, Marek (advisor)
This thesis deals with energetical use of agropellets made from agricultural residues especially in the terms of compliance with emission limits. First part is brief research of biomass in general and about methods of its processing. Second part deals with emissions from agropellets combustion and third part consists of an experiment where several types of pellets were burned, and their emissions evaluated.
Fine combustion particles produced from real burning of biomass
Pažourek, Josef ; Poláčik, Ján (referee) ; Pospíšil, Jiří (advisor)
This bachelor’s thesis deals with fine combustion particles produced from real burning of biomass. The first chapter is about biomass, combustion devices in which biomass can be combusted and last but not least polluting substances, which are created during the combustion. In experimental part the measuring equipment that measures fine particles is presented. After that the results from measurement are evaluated.

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