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Design of airframe mold for ultra-light aircraft manufacturing
Zatočilová, Aneta ; Dočkal, Aleš (referee) ; Paloušek, David (advisor)
This diploma thesis deals with digital data processing during the design of a mould of ultralight airplane airframe. The final digital model meets the demands on manufacturability by using CNC machining. The realization, in compliance with the reverse engineering approach, was conceived in four phases, which had to be solved step by step in order to preserve the continuity of the process. The phases correspond to the main chapters of the practical part of the thesis. The first part is focused on 3D digitalization of airplane fuselage by using an optic scanner ATOS and photogrammetric system Tritop. The result of this part is digital data of fuselage geometry in form of polygon grid. Next part deals with software reconstruction of collected data – by optimizing polygon grid in order to provide suitable base for surface modeling. The third part, the most time demanding, handles the creation of airplane fuselage surface model. Geometry has to satisfy requirements for smoothness and tangential or curvative connection of surfaces, including other requirements resulting from model usage. The final part of the thesis documents the procedure of deriving a mould from the aircraft fuselage geometry.
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Measurement of nucleation rate in corrossive mixtures
Krejčí, A. Petr
For a complete description of two-phase flow a basic informationabout liquid phase formation is needed. The information is fulfilled in terms ofnucleation rate and its dependency on quantities characteristic for gas-phaseflow. One of devices used for measuring of nucleation rate in multi-componentsystems of vapors and gases is a shock tube. Unique modification of this devicedesigned for measuring in chemically aggressive mixtures is described.
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Study of the synthesis and structure of ceramic perovskite materials for energy applications
Strejček, Josef ; Bartoníčková, Eva (referee) ; Cihlář, Jaroslav (advisor)
Method, so called “glycin- nitrate process”, combined with high temperature solid state reaction, of preparation multi- component ceramic perovskite materials was studied. Two types of perovskite systems were prepared by this method. Firs one, based on LaNiO3 doped by calcium and aluminium and second one, based on SmFeO3 doped by calcium and nickel or cobalt. This method made possible preparation of one phase perovskite or perovskites with few percent of nickel in form of oxide. In systems containing both nickel and calcium another phases rich in calcium and nickel appeared.
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Design of a methodology for BI solutions in QlikView environment
Judová, Eva ; Pour, Jan (advisor) ; Kunst, Jan (referee)
This master thesis is devoted to a design for methodology of BI projects in QlikView. The main aim is to propose a recommended procedure solutions reflecting the strengths and weaknesses in the development of QlikView applications. Accompanying chapter to the discussed issue is a chapter Business Intelligence which explains the principles, characteristics and reasons for implementation in companies. Part of defining the differences between traditional and self-service solutions serves as a theoretical basis for understanding the increasing attractiveness of self-service solutions and environment of the proposed methodology. The next chapter presents the company Qlik as a market leader in BI and the owner of QlikView. The reasons for its establishment, subsequent development and actual vision are listed to create a comprehensive view of the environment where the described product was created. Along with the chapter focusing on characteristics and main advantages of QlikView a knowledge base is established for the implementation of proposed methodology. Crucial chapter of this thesis is based on the author's experience gained while implementing QlikView projects. The proposed methodology is based on the description of each phase, its activities, inputs and outputs and its concrete application in a demo environment for the area of receivables in manufacturing company. The key contribution of the author is pointing out potential problems during development or warning about critical parts or providing appropriate recommendations and benefits of the proposed procedures. The designed methodology can serve as a useful guide for self-service projects implemented the QlikView environment.
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Ab initio studie Lavesových fází v systémech Fe-Cr, Fe-Mo a Fe-Ta
Houserová, Jana ; Šob, Mojmír
Binary systems Fe-Cr, Fe-Mo and Fe-Ta can be found in many kinds of steels where the Laves-phase can be considered as a potential candidate for strengthening provided size and distribution of the particles are within certain limits. We performed electronic structure calculations to study the thermodynamic and structural properties of the C14 Laves phase with various compositions. In the frame of the thermodynamic study, we have evaluated the total energies of formation of Laves phase structure with different occupations of sublattices (Fe2Fe, Fe2X, X2Fe, X2X, where X stands for Cr, Mo and Ta) with respect to the Standard Element Reference (SER) states. These energies of formation are of great importance for prediction of stability of studied configurations.
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Analysis of management of the dance internship Dance Without Limits
Hejnová, Klára ; Riedlbauch, Václav (advisor) ; Janeček, Václav (referee)
This thesis focuses on issues related to the organization of cultural projects. The first part is devoted to definitions of project and internship and the specifics of cultural project. The following theoretical point describes the project staffing, strategic planning, marketing, financing and important phases of projects. The management of internship Dance without limits is analyzed in detail in practical part, which is completed with practical knowledge of the organization of this event. This analysis is based not only on information provided by the organizers of this internship, but also from the questionnaire and the author's personal experience from preparing this dance internship. Part of this thesis is also an evaluation of the management of Dance without limits and suggesting possible improvements for the future.
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Dispersive optical bistability in unidirectional ring cavity
Šrobár, Fedor
The models of dispersive optical bistability in unidirectional ring cavity yield transmitted intensity as a function of input intensity with additional parameters /mirror reflectivity and phase shift/. There is a feedback element in the description: the dependence of the phase shift on the transmitted power. The region of physically unstable states is marked by the condition specifying that the transmission function of the feedback loop present in the representative causal diagram is greater than 1.
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Ellipsometry of Thin Films
Novotný, Zbyněk ; Navrátil, Karel (referee) ; Nebojsa, Alois (advisor)
Diploma thesis deals with ageing process of thin films of Co and Cu on Si substrate, prepared by the IBAD method. The process of film ageing, which depends on time of exposition to the atmosphere at room conditions, was investigated with spectroscopic ellipsometry (VIS+UV) and atomic force microscopy. In case of thin Co films, approximately four days long incubation period was observed. During this time period, a change in the optical parameters of the film occurs without a measurable change of the film topography. Using non-contact atomic force microscopy, a growth of the transitional film in the island growth regime was observed. During the ageing of thin Cu films, two stages of growth of the transitional layer were observed - nucleation stage and growth stage. Both of these time periods of the transitional layer growth show direct logarithmic dependence. Using non-contact atomic force microscopy, the growth of the transitional film was observed. Using atomic force microscopy in non-contact regime, time dependent measurement was done and the process of forming of one monolayer of the transitional layer was documented. Within the diploma thesis, a series of experiments on ultra high vacuum system were performed in order to investigate phase transformation of thin Fe films (22 monolayers) on Cu(100) stabilized by CO absorption. The transformation from fcc phase to bcc phase was induced by Ar+ ion beam bombardment with the ion energy in the range (0.5-4) keV. The process of phase transformation was observed by surface magneto-optic Kerr effect, Auger electron spectroscopy and low energy electron diffraction.
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