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Interaction between TiAl melt and coated oxide refractories
Dočekalová, Kateřina ; Dlouhý, Antonín ; Zemčík, L. ; Fiala, J.
The present study focuses on reactions between ceramic crucibles and molten TiAl intermetallics. Coating strategies are investigated that exhibit a potential in slowing down the decomposition of the crucible wall. Uncoated crucibles (system TiAl melt - Al2O3 crucible) and crucibles with the coat (system TiAl melt - CaO coat - Al2O3 crucible) were used in melting and casting experiments. The reference state of the coated crucible before the melting trial was also investigated. Results of the SEM, EDAX and X-ray diffraction analysis contributed to the identification of the reaction zone and its chemical composition. The melt contamination with oxide inclusions results from the erosion process in which individual components of the melt diffuse along grain boundaries of the refractory and activate chemical reactions that decompose the crucible wall. Assessment of thermodynamic parameters associated with the chemical reactions helped in identifying the nature of the erosion process.
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Contacts betweeen family and school on elementary school
Lívancová, Šárka ; Hadj - Moussová, Zuzana (advisor) ; Viktorová, Ida (referee)
Diploma thesis discusses the communication between family and teachers, especially the specific aspects of this interaction considering small schools. The communication between parents and teachers is one of the important parts of coordination of parents and school. Communication can be divided into direct, represented by f a c e - t o - f a ce contact between parents and teachers, and indirect, which comprise telephone conversation and other messages delivered by the pupils. This t h e s i s focuses on the direct type of communication. It aims to describe s p e c i f i c forms of direct communication in context of s p e c i f i c traits of r e l a t ed environment. We assume, that the village environment, which is common for small schools, doesn't suffer of anonymity of large cities, and that people in this environment generally have closer contacts with each other. Small schools are schools for 6 to 11 years old, o f f e r i n g only the primary level of education, for which the higher rate of p a r e n t - t e a c h e r i n t e r a c t i o n is typical. In these small schools, the primary education has the p o s s i b i l i t y to preserve i t ' s autonomy, and it i s n ' t influenced by the secondary level education, which appears to be dominant, when the both levels are combined. Last but not least...
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Study of plasma-solid interaction at medium pressures
Roučka, Štěpán ; Hrach, Rudolf (advisor) ; Novotný, Dušan (referee)
The thesis is aimed at particle simulation of plasma at medium pressures. Main results concern modelling of collisions in particle-in-cell algorithm. Dierent methods of modelling of collisions are discussed and their accuracy and eciency are investigated. Furthermore a new modication of particle-in-cell algorithm for modelling at medium pressures was proposed. Numerical benchmarks in the nal chapter show advantages of the new algorithm.
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Analysing company's behaviour and communication on social networks
Němec, Milan ; Molnár, Zdeněk (advisor) ; Jelínek, Ivan (referee)
This thesis focuses on measuring company´s communication and behaviour on social networks. To capture the interaction between the company and its users the thesis uses web analytics tools. Therefore, the main objective of the thesis is analysis of these tools. To achieve this goal, the thesis characterizes social networks and their marketing opportunities for business promotion. Thanks to this, needs of using these tools is identified. The needs are: competitive analysis, optimizing communication, measuring achievement of objectives or detection competitive viral content. Research questions were determined and then analysis tools found answers to research questions. It was found that the tools provide various views of data and create a complete system for measuring and analysing behaviour and communication companies on social networks. The results were validated in a case study focused on the Facebook profile of the University of Economics in Prague. The study analysed the interaction profile of the school and its users and compared with others schools. In the results the analysis tools are validated and it is designed recommendation for improve engagement. This thesis revealed strengths and weaknesses of tools for measuring company´s communication and behaviour on social networks. It was found that these tools have wide range of use. They can be used for understanding the company's profile, its users, for purposes of competitive analysis, monitor corporate goals and optimize communications on social networks.
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Dynamic behavior od rotor dynamics stystem vibrating in a liquid
Chlud, Michal ; Pochylý, František (referee) ; Malenovský, Eduard (advisor)
This thesis deals with dynamic behavior of swirl turbine vibrating in a liquid. Primarily is studied decrease of natural frequencies of rotor due the interaction with fluid environment, namely for different levels of submerged rotor in fluid. After that follows the detection of natural frequencies of swirl turbine in operating speed. The problem is solved by computational modeling in ANSYS system. For this solution is used acoustic elements method. The results are compared with experiment.
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Animals in the looking glasses of Europe and India. The changing bonds between humans and animals in the course of the 19th and 20th century
Nováková, Hana ; Komárek, Stanislav (advisor) ; Marková, Dagmar (referee) ; Cílek, Václav (referee)
This paper deals with various aspects of human- animal relationship: biological, psychological and sociological; but also with the fact how deep and thorough impact can political events have on the paradigma pointed towards animals. Here, these are depicted on significant fields of human - animal interactions of modern times, for example zoological gardens, petkeeping, changing ways of hunting, and also within some more obscure phenomena, such as animal abuse in laboratory research and in "meat plants". I also try to trace the roots of the approach that people of modern time Europe perform towards animals, and I do the same for India. The writing is divided into two parts, each one containing four chapters. The part No. I. - The man and the animal in Euro-American cultural context - describes the turbulent changes the human - animal relationship underwent during the era of Enlightenment, and tries to explain why it was so. Animals have enjoyed a widespread interest since times immemorial, but have hardly ever been perceived from the tabula rasa point of view. On the contrary, they have often been seen through the prisma of human sociology, serving as the immense field of manifold human projections. As such, they have figured in copious kinds of modern "myths", being it myths of ritual or otherwise "fictive"...
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Media content organization and solutions in JavaFX
Smíšek, Matěj ; Pavlíčková, Jarmila (advisor) ; Tran, Lam (referee)
The bachelor thesis looks into changes in television and movie audience behavior. Increas-ing amount of TV shows and movies in user media library brings new needs those files properly organize a record which one has been already watched by user. Software solution must abide audience custom and allow smooth transition from slowly degrading television audience to new, more interactive one. Current offer on market of media organization software is broad, but it is important to focus in detail on functions of those applications and verify if they truly meet all set requirements, or if they are robust application software, which can be not very user-friendly for common user. Custom solution in Java using brand new user interface library JavaFX 8, which goal is to bring basic framework of possibilities of solving media organization for future programmers.
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Interaction of apoprotein with heme side chains: A comparison of cytochromes P450 and NO-synthases
Fastová, Dagmar ; Hudeček, Jiří (advisor) ; Šulc, Miroslav (referee)
Cytochromes P450 and NO-synthases are two classes of heme-thiolate proteins, participating in catalysis of important biochemical reactions. In this work we analysed and compared both enzyme groups from the viewpoint of torsional angles of vinyl side chains of heme in positions 2 and 4. We used the Yasara programme to analyse the available crystalographic data. Whereas the torsional angle distributions for both vinyl groups in NO-synthases are pointing to a rather "conservative" conformations of both vinyls (between -30ř and 90ř for position 2, -150ř to 120ř for position 4, resp.) with little differences for individual forms of these enzymes, the mammalian cytochromes P450 display considerable differences between different families. In accordance with previous analyses is the distribution of torsional angles of 2-vinyls in most cases narrower (-120ř to 150ř) compared to 4-vinyls, which display more conformational flexibility (with torsional angles between -30ř and 180ř). In the second part of the Thesis we analysed the interaction of cytochrome P450 with its reaction partner, cytochrome P450 reductase. On the basis of crystalographic data we tried to prove, if the spatial positions of basic aminoacids, corresponding in the primary structure of various mammalian forms the those in the isoform 2B4...
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Dynamic behavior od rotor dynamics system vibrating in a liquid
Kučera, Martin ; Pohanka, Lukáš (referee) ; Malenovský, Eduard (advisor)
This thesis deals with dynamic behavior of rotor dynamics system vibrating in a liquid. Work is factually oriented on influence of the liquid to natural frequences of rotor of vortex turbine. There is described the creation of geometric and computational model of the system and the results of natural frequences and damping in dependence on environment are presen-ted. There are compared variations in natural frequences of the rotor system, which are caused of the interaction of the various level of the water environment. The step of integration are tested and compared for choise solving method. Problem is solved by computational simulation in commercial software ANSYS 11.0 There is used software tools Multiphysics/FSI.
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