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Modification of polyvinylalcohol of lower saponification degree for preparation of MDF composites
Kotrla, Jan ; Švec, Jiří (referee) ; Šoukal, František (advisor)
The subject of the bachelor thesis is modification of polyvinylalcohol of lower saponification degree for preparation of MDF composites. MDF composites are characterized by their extreme mechanical properties. However, their low resistance to moisture is a significant disadvantage. Increased moisture resistance could be achieved by grafting suitable functional groups on the polymeric chain and the subsequent cross-linking. The study is focused on optimization of the number of functional groups and the cross-linking conditions. The number of grafted functional groups was determined by UV – VIS, XPS analysis and IR spectrophotometry. The solubility of the crosslinked samples was measured by rheological measurements.
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Inclusions in steel castings
Kaněra, Miloš ; Šenberger, Jaroslav (referee) ; Pernica, Vítězslav (advisor)
This thesis presents basic knowledge and dividing about inclusions which, by their presence, influence quality and used property of steel casts. With focusing on basic group of exogenous and endogenous inclusions, the abstract of shapes was made as well as composition, condition for emergence and the reaction of melt which is in touch with surrounding impacts. The presence of characteristic inclusions influence technological dimension containing formability or fatigue behaviour falling into mechanical dimension. Constantly growing demands increase the importance of prevention, eventually reduction of impurity fraction with the help of steel refinement or inclusion modification. Success of suggested arrangements for quality improving is analysed by the following methods of identification.
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Use of polymers in road constructions
Klusková, Jana ; Komenda, Radek (referee) ; Stehlík, Dušan (advisor)
The diploma thesis deals with the use of recycled polymers in asphalt mixtures. In the theoretical part of the thesis there is discussed the global issue of plastic waste including the experience of foreign countries, where this technology has already been introducted and used. The practical part is devoted to the proposal of using recycled plastic in asphalt mixture, description of used laboratory tests and the evaluating the effect of low-density polyethylen (LDPE) on the asphalt mixture type AC. There were performed tensile strenght tests, water resistant tests and stiffness modulus tests in the laboratory (E). The output of this work is an evaluation of measured values, processing of results and their interpretation depending on the possible use of this technology in Czech republic.
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Modified Genetic Algorithms for Cellular Automata Design
Magdolen, Matej ; Vašíček, Zdeněk (referee) ; Bidlo, Michal (advisor)
This bachelor’s thesis aims to examine possibilities of designing a transition function enabling a cellular automaton to solve a given problem using a genetic algorithm. It contains an introduction to cellular automata, evolution algorithms and conditionally matching rules, a method of descripting a transition function suitable for evolutionary development. A set of experiments is conducted using the standard version of genetic algorithms to determine its optimal configuration. Additionally, modifications of this standard algorithm are proposed, effect of which on the algorithm’s performance is then evaluated by further experiments.
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Design of winglet for LS-3 glider
Koutník, Tomáš ; Šošovička, Róbert (referee) ; Popela, Robert (advisor)
This diploma thesis describes the design of winglets for LS-3 glider. The method for determination of main winglet parameters based on selected criterion is presented as well as comparation of performace of original wing and final modification. It also includes analysis of wing loading and resetting of speed and weight limits for flying with winglets.
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Formula Student Clutch
Drbal, Milan ; Zubík, Martin (referee) ; Janoušek, Michal (advisor)
This thesis deals with clutches used in Formula Student competition, calculation of the clutch used in Husqvarna FE 501and Husaberg FE 570 motor and modification of FE 570 clutch for usage in turbocharged version of the Husqvarna FE 501 with Garret turbocharger. The clutch is multi-plate wet clutch with pressure plate spring. Modification is done by installing bigger clutch set from Husaberg FE 570 engine, which is more suitable for usage in a racing car thanks to bigger torque transferred by the clutch. In the first part a research of multi-plate clutches, which can be found in most of the modern motorcycle engines was done. In the second part the calculations were made in order to set an approximated torque possible to transfer with stock Husaberg FE 570 clutch and a modification design for improvement with realisation.
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Modification of graphitic cast irons and fading of the modification effect
Paták, Daniel ; Bořil, Petr (referee) ; Kaňa, Václav (advisor)
The thesis presents a literature research concerning the production of cast irons with globular graphite. Emphasis is on the clarification of the modification principle and the fading of modification effect. Within the scope of the thesis, an in-house experiment investigating the issue has been carried out with a description of the modification method itself and an evaluation of the decay of the modification effect.
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Manufacture of compacted graphite cast iron
Jankes, Erik ; Bouška, Ondřej (referee) ; Záděra, Antonín (advisor)
Compacted graphite cast iron is new kind of cast iron that is applied especially in car industry. It is necessary to optimize metallurgical process of melting and verify technological behaviour of cast iron at loading production. This bachelor thesis describes the properties and known production possibilities of the material.
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