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Structure and properties of magnesium alloys Mg-Ca-Zn
Hlavnička, Jiří ; Pacal, Bohumil (referee) ; Doležal, Pavel (advisor)
This master’s thesis deals with design and preparation of a new biodegradable magnesium alloy based on Mg-Ca-Zn. Based on information from literature, the Mg-3Zn-2Ca alloy was designed. The base material was produced by gravity casting and the evaluation in the as-cast and heat treated state was performed. For preparation of the experimental material, following methods were designed: squeeze casting, hot rolling and the ECAP. During preparation by hot rolling, no optimal conditions were found and significant cracks occurred in both as-cast and heat treated material. In the case of experimental material, prepared by the ECAP method with back-pressure, better combination of stress-strain properties was observed. Also the squeeze casting method showed improvement; especially the amount of casting defects was eliminated. The evaluation of microstructure and mechanical properties was performed by the light and scanning electron microscopy, RTG phase analysis and the tensile and compression tests.
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Evaluation of corrosion resistance of magnesium alloy AZ61
Hlavnička, Jiří ; Horynová, Miroslava (referee) ; Doležal, Pavel (advisor)
This work is foccused on assessment of corrosion resistivity and character of corrosion attack of AZ61 magnesium alloy. Squeeze casting specimens in both as-cast state and in solution annealing state were used as the experimental material. Corrosion degradation was performed in a salt spray fog (5% solution of sodium chloride). Mechanism of corrosion, appearance and depth of corrosion attack have been evaluated.
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Structure and properties of magnesium alloys Mg-Ca-Zn
Hlavnička, Jiří ; Pacal, Bohumil (referee) ; Doležal, Pavel (advisor)
This master’s thesis deals with design and preparation of a new biodegradable magnesium alloy based on Mg-Ca-Zn. Based on information from literature, the Mg-3Zn-2Ca alloy was designed. The base material was produced by gravity casting and the evaluation in the as-cast and heat treated state was performed. For preparation of the experimental material, following methods were designed: squeeze casting, hot rolling and the ECAP. During preparation by hot rolling, no optimal conditions were found and significant cracks occurred in both as-cast and heat treated material. In the case of experimental material, prepared by the ECAP method with back-pressure, better combination of stress-strain properties was observed. Also the squeeze casting method showed improvement; especially the amount of casting defects was eliminated. The evaluation of microstructure and mechanical properties was performed by the light and scanning electron microscopy, RTG phase analysis and the tensile and compression tests.
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Evaluation of corrosion resistance of magnesium alloy AZ61
Hlavnička, Jiří ; Horynová, Miroslava (referee) ; Doležal, Pavel (advisor)
This work is foccused on assessment of corrosion resistivity and character of corrosion attack of AZ61 magnesium alloy. Squeeze casting specimens in both as-cast state and in solution annealing state were used as the experimental material. Corrosion degradation was performed in a salt spray fog (5% solution of sodium chloride). Mechanism of corrosion, appearance and depth of corrosion attack have been evaluated.
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Business strategy of an agriculture enterprise located within the Protected Landscape Area Třeboňsko
HLAVNIČKA, Jiří
Landuse for farming purposes in specially protected areas could be characterised as a longterm process of seeking balance between the concerns of environmental protection and farming activities. This is also true for agriculture. Precautions to protect the environment mean certain limitiation, however, on the other hand, suitable forms of farming a large protected area can be supported by the state. Farmers can gain the government support not only for their own agricultural production but also to carry out various environmental task to maintain the landscape. This diploma thesis evaluates the use of governmental support in the protected area Třeboňsko. It analyses the structure of farms and agriculture companies, the system of farming activities, structure and development of farmland. According to the system of farming, it evaluates the use of financial support from the Ministry of Agriculture with the emphasis on the environmental protection and its improvement. It also finds out about the importance of the subsidies for the farmers. Based on the analyses that were carried out it is possible to say that all types of farming companies make use of the subsidy support from the Ministry of Agriculture. The farmers use the Programme for Rural Areas Development to permanently develop the country and improve the environmment. They use mainly the payments for natural disadvantage compensation and for agroenvironmental precautions. The subsidies often form a substantial source of the farming subjects' income.
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Development of the Czech Republic Agriculture after Joining the European Union, as Related to the State Subsidy Policy
HLAVNIČKA, Jiří
Agriculture, ecology and rural development are often associated with policy of subsidy, in which the Czech Republic plays an important role and the European Union is the principal provider of financial resources. The agricultural policy of the Czech Republic before and after joining the European Union came out from the conceptions of agrarian policy approved by the government, where the environmental principles of sustainable agriculture were strengthened, especially between years 2004 - 2013. In the Czech Republic, the support of rural development and farm land use which follows the line of environment and landscape protection and improvement is realised in terms of agro environmental measures. Support of organic agriculture is part of them as well. Bachelor thesis evaluates the influence of the state policy of subsidy on the development of organic agriculture. In particular, it analyzes the progress of the support to organic agriculture, identifies the possible changes in land resources structure and share of areas used for organic agriculture. And in the end, it evaluates the progress of provided rates and state financial support to organic agriculture.
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