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Segregation during solidification in austenitic-ferritic stainless steels
Kejha, Richard ; Čech, Jan (referee) ; Pernica, Vítězslav (advisor)
The master thesis deals with processes of segregation in austenitic-ferritic stainless steels. The introductory part consists of characteristics features of austenitic-ferritic steels and theoretical analysis of segregation processes. The second part shows practical measurements of segregation in experimental casting. Macrosegregation was measured on a spectrometric analyzer and simultaneously solved in the simulation program MAGMA. The aim of this thesis is to verify the effect of solidification time and dwell time between liquidus and solidus temperature on the chemical heterogeneity of duplex stainless steel casting of about 500 [mm]. Chemical heterogeneity was solved for selected alloying and accompanying elements such as C, Mo, Ni, Mn, Cr. The microsegregation was not addressed. Comparison of the mechanical properties of cast and heat treated duplex steel was done by tensile testing of samples cut from the center of the casting.
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Defects and properties of heavy castings
Sobotka, Petr ; Carbol, Zdeněk (referee) ; Záděra, Antonín (advisor)
A diploma thesis was objected to a figure analyzing and a figure interpretation of ingot processing. The described figures were obtained from samples which were taking from feeder-heads of ingot of lower ram, produced in Vitkovice Machinery Group. The thesis was focused on ingot solidification and segregation processes which were associated with this procedure. The figures obtained from numeric simulation of ingot solidification in defined places were analyzed using statistic method – linear regression, as well as linear regression was used for evaluation of explored samples, their chemical compositions and mechanical properties. In conclusion all acquired results were summarized.
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News in the field of the road construction
Zelenka, Lukáš ; Zajíček, Jan (referee) ; Varaus, Michal (advisor)
The bachelor’s thesis focuses on new technological equipment for transport and paving of asphalt mixtures. Specifically, it is a thermo superstructure with an extrusion face and a homogenization tank of an asphalt mixture. The advantages of these machines and their positive influence on the quality of the work are described. Subsequently, the researches which confirm it are described. The last chapter describes recommendations for the contracting authority to require the use of these technologies in tenders.
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The segragation of mixtures to pavement
Trávníček, Dušan ; Hýzl, Petr (referee) ; Stehlík, Dušan (advisor)
The work deals with the examination of repression and segregation in asphalt mixtures. The theoretical part is monitoring the current situation about the problem of segregation, which mainly refers to the practical adjustments during laying „risking“ asphalt mixtures on the formation of segregated places in the shelter layers of roads. The practical parts of the thesis are summarised measurements on six samples of the most commonly used asphalt mixtures to determine the segregation depending on the selected parameters. The work is describing and valorising a test for determining segregation according to ČSN EN 12697-15.
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Multikulturní vzdělávání na středních školách
Koshkina, Yuliya
In this work, the topic of multicultural education in secondary schools and its relationship to the process of integration of students from foreign countries is discussed in detail. Emphasis will be placed on how educational processes and activities can be adapted to the needs of students of different cultures and how the level of understanding and tolerance between students can be increased. Another key question described here is the characteristics of personalities that contribute to the successful process of integration between students of different cultures and how these characteristics can be developed. Furthermore, the work reflects what the possibilities and limits are for the development of integration skills and how these skills can be developed through educational activities and programs. The work is divided into two parts: theoretical and practical. The theoretical part of the work deals with legislation, language and cultural differences. Discusses the issue of the increase in the number of foreign students in schools, the conditions for their admission to secondary schools and the subsequent teaching process. The aim of the practical part was to find out, with the help of the data obtained from the questionnaire survey, how pupils see the relation-ships between themselves and pupils-foreigners and, conversely, how foreigners perceive other pupils. The effort was to find out how integration and/or inclusion is realized in practice in the current high school.
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Emancipation of African Americans in the Progressive Era (1880-1920)
PIKALOVÁ, Zlata
The presented bachelor's thesis deals with the emancipation of African Americans during the Progressive Era, when major social and economic changes were taking place. It focuses on the efforts of the African American community to uplift their race and achieve equality after the recent abolition of slavery. Much of the work focuses on the African American leader, Booker T. Washington, his ideas and his conflict with his competitor, W. E. B. Du Bois.
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Design of boundary conditions for mixtures for road base layers
Holubec, Matěj ; Hýzl, Petr (referee) ; Stehlík, Dušan (advisor)
The bachelor thesis deals with the design of suitable composition of uncompacted mixtures and mixtures cemented with hydraulic binders for road pavement subbase layers. The theoretical part describes the characteristic properties and applications of the tested material. The practical part deals with the determination of the geometric properties of unbound mixtures and mixtures bound with hydraulic binder, which are determined on the basic of laboratory tests.
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