This thesis called "Influence of an operation mode of a tractor on function of selective catalytic reduction system" describes various operation modes of the tractor, when aqueous solution of urea (AdBlue) was injected into selective catalytic reduction system. The first part jkdeals with particular pollutants in exhaust fumes. Formation of pollutants and their impact on humans and environment is described in this chapter. The second part describes individual technical systems used to lower harmful components, especially selective catalytic reduction system. The last part concentrates on practical measuring of operating parameters of the tractor, particularly consumption of aqueous solution of urea conducted in different modes of a motor. Part of the experimental measuring is graphic and verbal evaluation.

This diploma thesis deals with clean mobility, which becomes one of the current topics of today's society. Limited oil reserves and the state of the environment leads the goverments of developer countries to introduce alternative fuels in transport. The aim of the thesis is to clarify the economic costs and benefits of the practical application of clean mobility and to answer the question if the using of alternative fuels is economically rational. The Response is influenced by many factors and depends on the type of alternative fuel, the legislative framework of the country, the society awareness and others. Strength of the CNG's alternative fuel is mainly the lower fuel cost as well as for electromobility. The weakness of these fuels is the insufficient accessibility network of filling / charging places. An economic analysis of vehicle fleet modification of the Czech Environmental Inspectorate demonstrates that, under the current conditions, it is less costly to operate a vehicle with CNG alternative fuel. It is valid as well when the social cost of emissions are included.

Diplomová práce na téma vybrané ekonomické a environmentální dopady zavádění bioethanolu jako součásti motorových paliv hodnotí některé dopady této legislativou dané povinnosti. Práce se především snaží vysvětlit možné dopady ekonomické, environmentální a sociální (změnu kvality ovduší, zdražování potravin a surovin, energetickou náročnost výroby a samotnou potřebu fosilních paliv při výrobě biosložky). Dále ukazuje přístup jednotlivých složek státního aparátu (MŽP, MPO, MD a MZe) a možnosti finanční podpory výrobcům bioethanolu.

The diploma thesis focuses on world oil supply and aims to distinguish symptoms undoubtedly pointing to a possibly upcoming era of altered consumption and extraction patterns of oil products, which will be launched by "peak oil" -- a point when oil production reaches its maximum continues to decline. The thesis' objective is to analyse the probability of peak oil occurring and possible implications for world economy and selected countries. If proven true, it provides a an answer to the question whether the world economy can survive peaking without repercussions or whether it will shrink and decline into crisis. The first part defines the supply of oil and -- it's an overview of conventional and unconventional types of oil, petroleum products, oil fields, extraction techniques, energy effectiveness and substitutes. Furthermore, it defines "peak oil", it clarifies its history, strives to determine its possible date and compares it with the current oil situation. The second part surveys general implications of peak oil for world economics and politics -- it observes an unsatisfied oil demand, impact on the outputs of economies and the role of oil in economic crises. The political part follows with possible changes in the field of international politics. Lastly it tries to determine the effect on American suburbia. The third and final part is dedicated to selected countries, which are either important exporters or importers.

The present thesis entitled "Impact of the tractor control hydraulics setting on the output parameters of the tilling system" in its reference part surveys the current state of the design of hydraulic systems in agricultural tractors. The practical part of the thesis is focused on implementation and evaluation of experimental measurement. The measurement employed a tilling system featuring a tractor Class Axion 850 and a four-furrow mounted plough Kverneland EG 85 Variomat. The goal was to identify the effects of various types of hydraulic system controls on the fuel consumption, drive slip and tilling system performance. The measured values have been processed and presented in tables and graphics. The conclusion has been formulated on the basis of the identified results.

The name of this diploma thesis is „Evaluation of combustion engine fuel and its influence on the environment”. At the beginning there is a brief history of fuels. After that there is a chapter which divides fuels according to their state thus they are separate to three main types (solid state, gaseous state and liquid state). There are described main characteristics in the next part of this thesis which are heat of combustion, bulk density, dosage, volatility, resistance to detonation burning and mainly octane and cetane number. There are described currently used fuels for combustion engines right after the characteristic of fuels. These fuels are divided to fuels made of petroleum (gasoline, diesel, and LPG), fuels made of natural gas (CNG, and LNG), biofuels (bioethanol, biomethanol, vegetable oils – FAME and synthetic diesel fuel) and there is also an independent group of hydrogen. Thereafter are described European emission standards. The practical part of the thesis is focused on an analysis of previously mentioned fuels and there is a biggest focus on production of carbon dioxide. Other emissions are evaluated as well such as carbon monoxide, hydrocarbons and NOx gases. The analysis is done on classical fuels like gasoline and diesel and also on alternative fuels such as CNG, LPG, E85, FAME and hydrogen. In the end there are tables and graphs which contains production of flue gases.

This master´s thesis is divided into two parts. The first one is a theoretical part and deals with the current situation in the tractor´s construction, particularly motor systems for reducing the emission of harmful substances in exhaust gases, tractor transmissions and electro-hydraulic system. In the second practical part the measuring of economic parameters of the tractor rigs during plowing was conducted and processed. The measured parameters were fuel consumption, engine speed, tillage depth, width, time and total time for rotation. Theme assured parameters which calculated the operational and efficient fuel consumption and the performance kit. These values were processed in graphical and tabular form. They were detected by measuring the parameters of the efficiency and diesel consumption during operation for the tractor rigs John Deere 8220 equipped with a rotary plow KVERNELAND PN 100 with seven tines. The measurement was in the economic engine speed (1600 to 1800 rpm) and (1800 to 2100 rpm) considering a full dose of fuel.

This master thesis deals with the influence of installation of ecological taxes upon public budgets. The aim is to review, whether collecting of ecological taxes caused reduction of consumption of the taxed fuel and energy. The comparative method is used here to compare the budget and the real payment of the ecological taxes in 2008 and 2009 in the Czech republic. The well-arranged tables and graphs show the comparison of the consumption of the fuel and energy since 2005 to 2009. The result of the research shows, that the collecting of the ecological taxes did not reach the expected amount, so the planned budget was not filled up. The consumption of the fuel and the energy in 2008 and 2009 decreased as expected, but it is impossible to appoint safely, whether the decrease was caused by the implementation of the ecological taxes to the czech legislature.

Thesis Abstract This thesis has been performed under co-tutelle supervision between Charles University in Prague (Czech Republic) and Strasbourg University (France). It also profited from the background and cooperation of Institute of Inorganic Chemistry Academy of Science of the Czech Republic and French Commission for Atomic and Alternative energies (CEA Cadarache, France). Results of the work contribute to the OECD/NEA project Serena 2 (Program on Steam Explosion Resolution for Nuclear Applications). Presented thesis can be classed in the scientific field of nuclear safety and material science. It is aimed on the so-called "molten nuclear Fuel - Coolant Interaction" (FCI) that belongs among the recent issues of the nuclear reactor severe accident R&D. During the nuclear reactor melt down accident the melted reactor load can interact with the coolant (light water). This interaction can be located inside the vessel or outside in the case of vessel break-up. These two scenarios are commonly called in- and ex-vessel FCI and they differ in the conditions such as initial pressure of the system, water sub-cooling etc. The Molten fuel - coolant interaction can progress into thermal detonation called also "steam explosion" that can challenge the reactor or containment integrity. Recent experiments have shown that...

The present master thesis deals with the topic of load applied to driving wheels of tractors and its impact on output parameters of tilling systems. Introduction describes the advantages and disadvantages of tillage. It briefly presents its history, evolution and possible improvements of its parameters by correct plough and three-point linkage system of tractor settings. The following part explains the impact of load distribution between tractor driving wheels on its thrust properties. Some possibilities of improving load distribution between driving wheels are also specified and described here. Special attention was dedicated to improvement of load distribution by transferring part of the plough weight to the tractor. The practical part of the thesis explored the impact of force in upper linkage of three-point linkage system of tractor on the force transfer and subsequently on the output parameters of tilling systems. Two measurements were processed in the present master thesis, one focusing on the total additional loading or tractor rear axle and one focused on balancing the load difference between the right-hand side and left-hand side wheel of rear axle. The measured values were processed in tabular form and further evaluated by regression analysis. Conclusion was formulated based on the identified results.