Content of my diploma thesis focuses on identification of properties and usability of nascent fuel for automotive use. It is a bio-ethanol which can be produced from renewable sources. The heart of this work is to develop methodology of experimental trials in connection with utilization of bio-ethanol E85 as a fuel for vehicle combustion engines. The aim is to perform tests with E85 and BA95 fuels in engine testing room of ÚADI FSI, to compare these trials amongst themselves and to analyze obtained results. Subsequent part of diploma thesis covers overview of general usage of bio-ethanol in road transportation.

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.

The thesis evaluates three revenue neutral mixes of political measures aimed at the support of utilization of biofuels in the Czech Republic. The dynamic computable general equilibrium model with three aggregated sectors and two types of households is applied for evaluation of relevant environmental and economic impacts. The hypothetic price subsidy of utilization of energy biomass in production of the first generation biofuels fulfilling sustainability criteria is chosen as the basic supportive tool. The revenue neutrality is satisfied via adequate increase in tax rates in three different alternative scenarios (via labor tax, motor fuel tax, and standard value added tax). The results indicate that at the current price level of crude oil even relatively high level of price subsidy is not sufficient in fulfilling the emission and biofuel share targets presumed by European Commission. Therefore, for attaining the biofuel share target high percentage first generation biofuels and second and third generation biofuels have to be utilized. Furthermore, for the fulfilling of emission targets other alternative fuels have to be utilized as well. The results finally reveal that environmentally most efficient mix is the price subsidy compensated via an increase in the motor fuel tax, economically most...

The thesis evaluates three revenue neutral mixes of political measures aimed at the support of utilization of biofuels in the Czech Republic. The dynamic computable general equilibrium model with three aggregated sectors and two types of households is applied for evaluation of relevant environmental and economic impacts. The hypothetic price subsidy of utilization of energy biomass in production of the first generation biofuels fulfilling sustainability criteria is chosen as the basic supportive tool. The revenue neutrality is satisfied via adequate increase in tax rates in three different alternative scenarios (via labor tax, motor fuel tax, and standard value added tax). The results indicate that at the current price level of crude oil even relatively high level of price subsidy is not sufficient in fulfilling the emission and biofuel share targets presumed by European Commission. Therefore, for attaining the biofuel share target high percentage first generation biofuels and second and third generation biofuels have to be utilized. Furthermore, for the fulfilling of emission targets other alternative fuels have to be utilized as well. The results finally reveal that environmentally most efficient mix is the price subsidy compensated via an increase in the motor fuel tax, economically most...

The subject of this thesis are both available and potentional gaseous and liquid biofuels. The thesis deals with their detailed description and comparison. The first part describes the current legislation and the basic types of biofuels. The main part focuses then on biofuels themselves, their characteristics, production, utilization, and their impact on environment. In further parts, emissions created during the cycle of production and distribution of biofuel are characterized. Last part brings comparison of biofuels from different points of view, and recommendation of the alternative ways of production of gaseous and liquid biofuels from renewable resources of energy.

In recent years biofuels support is on the rise and is leading to rise in their productions. Biofuels are produced on land with agricultural products that is why there is rising land competition. Food prices are rising fast and food security is deteriorating. Hypothesis is that countries and international organizations are introducing measuress to guarantee food security. The aim of the thesis is to analyze interventions that respond to impacts of biofuel support in selected countries. The hypothesis is right. States are introducing measures to guarantee food security. Developed states give more financial donations to humanitarian institutions and support development of second generation biofuels that is not competitive with food production. Developing states implement for example increasing food export duties or prohibition of food exports, reducing food import duties and reducing tax levy on food. Some developing states have decided for food safeguarding.

This PhD thesis deals with problems covering production of pallets and chunky wood, using small-scale technologies. There are particularly solved issues focused on fuel embedded energy and return on investment. Further, solid biofuels properties are discussed, and then the study of solid biofuels use in small hear sources was made being focused on the Czech Republic conditions. Particular attention is paid to problems with automatic pellet ignition. The last part is devoted to presenting partial results of a forwarder prototype, which is being solved currently.

No description available.

This diploma thesis focuses on the analysis of scientific literature and the current situation in the field of energy crops and world food prices and trying to express the contemporary situation in this area through discourse. It seeks to analyse the relationship between the production of technical and energy crops in relation to the production of food commodities, world food prices and the anticipated growth of the world's population. Analysis of secondary statistical data of selected productions of food commodities in the last 5 years and their comparison with the prices of selected technical and energy crops are trying to define the direct and indirect links between the development of prices of these commodities.

This diploma thesis "Reasons why there was a food crisis in 2007 and 2008" summarizes and analyzes to what extent contributed particular factors to food crises all around the world in 2007 and 2008. Media and some well known international organizations believed that the main factors that caused last food crises were bio-fuels and significantly increased demand from China and India. This diploma thesis summarizes all main factors and comes to conclusion that the main factor that should be eliminated as soon as possoble is the problem with global climatic changes. Several international organizations have discussed this issue on international and global level for several years so let us hope we will not only discuss but we will do some active and concrete steps to solve this global problem. Of course the other factors need to be eliminated or at least moderated in the future as well. None of the crises occurs because of some concrete factor. It is always set of reasons that have caused some global problem.