The diploma thesis is aimed to the influence of the high-pressure and low-pressure coolant system according to the machining operation. The comparison was carried out with different types of materials and cutting tools using the main machining operations – turning, milling, and drilling. The study is focused on the chip and heat removal from the cutting zone, tools life and wear of the tools. A description of the basic principle of the high-pressure coolant system meant is described in this thesis. The economical analysis of the high-pressure compared to low-pressure system was determined in the last part of this work.

No description available.

This diploma thesis aims to identify the main factors that affect farmers' decisions to convert from conventional farming to organic farming. Currently, organic farming and organic products are highly popularized because they represent one of the ways of achieving a sustainable development of human society and environment. Thus, many developed countries, including the Czech Republic, support the development of organic farming. On the demand side, this is achieved by information and promotional campaigns. On the supply side, developed countries create conditions for certified organic farming systems. Organic farming subsidies are used as a compensation of the increased expenditure resulting from organic farming as compared to conventional farming. In the Czech Republic, the numbers of organic farms are still increasing. However, many questions remain to be answered. What are the incentives influencing the farmers' choices for organic farming? Are organic farmers propelled by the desire to produce healthy food and to contribute to the protection of the environment? Or are they predominantly motivated by economic factors, namely by the subsidies? In order to answer these questions, the author of the diploma thesis conducted a questionnaire survey among Czech organic farmers. The analysis of the survey provided a number of interesting findings. In particular, it can be concluded that the subsidies as an economic motivation factor influenced the farmers' choices for the organic farming. Yet, the noneconomic factors played even more significant role in the farmers' motivations than the subsidies. The most indicated noneconomic factor are an effort to live more in harmony with nature, to personally contribute to the protection of the environment, to avoid the use of chemicals or to produce healthy and quality food.

In the master’s thesis, we evaluate the impact of different types of soil treatment on the physical and hydro-physical properties of the subsurface layers of soil. The experimental research took place near the town of Šakvice in two chosen areas treated conventionally, i.e. by tillage. The PRP SOL substance was applied to one of the observed areas. Unimpaired soil samples were taken during the vegetation period of the grown crops in the topsoil (10,20 cm) and in the undersoil (30 cm) on 13th May 2009 and on 10th September 2009. The chosen physical parameters of the soil, i.e. the reduced volume mass, the porosity, the distribution of pores, the actual content of water and air, were determined by standard analytical methods. The double-ring infiltration method was used during the field measuring of infiltration. The Philip’s equation and the Philip’s type three-parameter equation were used for the data analysis, serving as a base for estimation of saturated water content Ks. A protractor with a constant gradient was used during laboratory measuring. The results of a year-long research have not shown any major influence of the PRP SOL substance on the physical quality of the subsurface layers of soil in the observed area. On the contrary, the permeability od the soil obtained on the basis of Ks estimation is higher in the area treated by the PRP SOL substance.