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Aerodynamic analysis of morphing geometry application to sailplane winglet design
Malinowski, Matěj ; Jebáček, Ivo (referee) ; Popela, Robert (advisor)
Diplomová práce se zabývá aerodynamickou analýzou a optimalizací wingletu kluzáku. Winglet je uvažován s možností změny tvaru v průběhu letu a optimalizační proces je zaměřen na odhalení optimálních tvarů v odlišných letových režimech. První část práce popisuje současné snahy v oblasti návrhu a vývoje wingletů s měnitelnou geometrií. Druhá část je zaměřena na popis funkce wingletu, následována třetí částí, která popisuje optimalizační metody, které mohou být použity během optimalizace. Další částí práce je popis letadla vybaveného wingletem, který byl vybrán pro optimalizaci. Tato část je následována požadavky stavebního předpisu kategorie letadla, které bylo vybráno. Následuje model typického letu tohoto letadla. Zbytek práce je organizován dle procesu hledání optimálních tvarů wingletu. Popis tvorby CAD modelu je následován popisem tvorby CFD modelu a popisem přípravy CDF simulací. V předposlední kapitole jsou odhaleny detaily optimalizačního procesu. Závěrečná část práce obsahuje vyhodnocení výsledků optimalizačního procesu.
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The comparison of DLP for CT brain examination and recommended DRL value.
VNOUČEK, Miroslav
The aim of the submitted work is to ascertain the quantity of a real dose through a statistic survey for the helical computed tomography examination protocol of the brain on a CT scanner of the RDG department at Benešov Hospital. A further goal is to suggest possible parametric adjustments to the brain examination protocol in view of possibly exceeding the European reference level (diagnostic reference level, DRL) and to optimise the dose when maintaining a sufficient quality of the image diagnostic utilisation rate. The principle of the CT scan and individual parameters most influencing the dose during CT examination and explanation of terms concerning the calculation of the dose in a CT scan are briefly described in the theoretical part of the work. A CT scanner, which has been used for the measuring, setting of scan parameters and dosage of the given examination protocol using the CT dose index volume (CTDIvol) a dose-length product (DLP) before the measurement, are described In the practical part, the extent of the dose-length product (DLP) examination of the brain of an adult on the given CT scan using a statistic survey and its interpretations is evaluated. A method for optimisation of the dose is described in order to mainly fulfil the criteria of the European diagnostic reference level (DRL) for dose-length product (DLP) and at the same time the figures of the usual CT dose index volume (CTDIvol) marked in the National Radiologic Standards for Computed Tomography. The outcomes of the preformed changes are a helical computed tomography examination protocol of the brain with reduced dose-length product (DLP) while maintaining the diagnostic utilisation rate of the examination.
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IMAP extension for mobile devices
Kundrát, Jan ; Peterka, Jiří (advisor) ; Spousta, Miroslav (referee)
With the mass availability of smartphones, mobile access to e-mail is gaining importance. Over the years, the IMAP protocol has been extended with many features ranging from extensions adding new functionality to those improving efficiency over an unreliable network. This thesis evaluates the available extensions based on their suitability for use in the context of a mobile client. Three new extensions have been developed, each improving the protocol in a distinct way. The thesis also discusses how most of these extensions were implemented in Trojitá, the author's free software open source IMAP e-mail client.
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Immobilization of protease V8 on magnetic particles for application to proteolytic cleavage of pepsin A
Čepa, Adam ; Pacáková, Věra (advisor) ; Tichá, Marie (referee)
This thesis is part of a long-standing research in the field of diagnosis of the stomach diseases, which is based on the gastric enzyme pepsin A mapping. It was found that a phosphorylation in the primary structure of this enzyme may serve as a marker of incipient stage of carcinogenesis. This thesis is focused on the immobilization of protease V8 isolated from microorganism Stafylococcus aureus to magnetic agarose beads. Protease V8 is a promising candidate for producing peptide maps of pepsin A. The influence of pH, temperature and reaction time on the enzyme to activity has been studied and the optimal conditions for hydrolytic catalysis of formation of peptide fragments of pepsin A.
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Optimization of marketing communication of SKF CZ, a.s.
Zastoupilová, Cecílie ; Vávra, Oldřich (advisor) ; Hloušek, Miloslav (referee)
The content of this thesis is based on the marketing communication in B2B in engineering company SKF CZ, a.s. on the Czech market. First the theory regarding B2B marketing, evaluation of marketing communication, situation analysis and marketing research is introduced. It is followed by situation analysis of the company SKF CZ, a.s. using the 5C method, the description of marketing communication and evaluation of its effectivity based on primary and secondary data. The conclusion consists of appropriate allocation of investments in marketing budget on marketing communication tools and setting appropriate measures for creating the marketing dashboard, which will continuously monitor and evaluate the efficiency of SKF CZ marketing communication.
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Ecodesign and its influence on the design of production machines
Sovják, Richard ; Tůma, Jiří (referee) ; Zahálka, Jiří (advisor)
The bachelor thesis focuses on processing regulatory legislative standards applying to production machines. It provides an overview of tools for assessing the life cycle of products using the methods of eco-design and summarizes the current approach manufacturers of production machinery in improving the energy efficiency of their products. It includes new design and conceptual design of production machinery including new machining technologies. It presents the advantages of virtual prototyping, additive technologies, optimization, toolpath verification and simulation of cutting forces. The result is a comprehensive overview of the factors affecting the eco design of production machines.
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Optimizing the production process chamber 80C
List, Jaroslav ; Zemčík, Oskar (referee) ; Dvořák, Jaromír (advisor)
The aim of this bachelor thesis is to suggest optimisations of the production process of chamber 80C at various stages of production and assess their applicability. The main emphasis is on reducing production costs. In the first chapter we analyze specifications and requirments of the customer. There is a suggested optimisation of procedures. In the theoretical part of thesis we analyze materiál, welding methods and production technologies used to manufacture parts of the working chamber. In the practical part we assess the applicability of possible methods of welding and cutting. We will choose parts of the weldment suitable for optimization and dedicate the optimisation suggested in the first chapter. In the conclusion we assess the optimisation suggestions from the economic point of view.
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Optimisation of Flow Rates in Lubrication Systems with Progressive Distributors by means of Genetic Algorithms
Vepřek, Jiří ; Pavlok, Bohuslav (referee) ; Bauer, František (referee) ; Habán, Vladimír (referee) ; Nevrlý, Josef (advisor)
This doctoral thesis presents the results of the development of two software programs for the design of progressive distributors and progressive lubrication systems. One of these programs implements a genetic algorithm and the other, which is used to design progressive lubrication systems, implements a parallel genetic algorithm of the island model. The program for the design of progressive distributors was implemented in Java using the NetBeans development environment and the other program was created in Matlab. The thesis further focuses on analytical and computational solutions of the flow of compressible greases seen as viscoplastic fluids. Equations for the numerical solution of the non-steady flow of compressible viscoplastic Bingham fluids were derived and solved by the Lax-Wendroff method in Matlab. As several constants had to be set in the equations, experiments were conducted with the ecological grease Plantogel 2S in the laboratory of the Kaplan Department of Hydraulic Machines, mainly to determine the sound velocity in this grease. The sound velocity was calculated based on the experimental results by applying Fourier transformation and the transition matrix method. In addition to this, the rheological measurements of greases were used. As seen from the results, the ecological greases are actually thixotropic viscoplastic fluids with a significant elastic element. Since a Newton fluid was assumed when calculating the sound velocity, the possibilities of using the transition matrix method for viscoplastic fluids were then considered. No analytical solution of the flow of viscoplastic fluids in a frequency spectrum has been published so far. Because it emerged that greases had a significant elastic stress factor, the problem of the non-steady flow of elastic-viscoplastic fluids was solved numerically between two infinite parallel plates by applying the finite difference method (FDM). The computation was done in Matlab. This doctoral thesis makes a contribution to solving problems related to the design of progressive distributors and progressive lubrication systems used to distribute compressible greases. Considering the complex approach to this field and the achieved results, the thesis also represents a significant contribution to design work.
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