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Preparation and characterization of Ni-P coating on AZ91 cast magnesium alloy
Brescher, Roman ; Buchtík, Martin (referee) ; Wasserbauer, Jaromír (advisor)
This bachelor thesis deals with electroless deposition of nickel-phosphoric (Ni-P) coating on AZ91 magnesium alloy. At the beginning of the theoretical part, there is a summary of basic knowledge about magnesium alloys with focus on AZ91 alloy and the influence of alloying elements and impurities and its microstructure. The theoretical part continues with the discussion of the Ni-P coating, focusing on the composition of the bath, the influence and the effect of its individual components. Next, there is a comparison with galvanic nickeling. At the end of the theoretical part, the current research of the use of electroless deposition of Ni-P layer on AZ91 magnesium alloy is summarized. In the practical part, there is the preparation of the Ni-P coating on the AZ91 magnesium alloy, the observation the microstructure of the magnesium alloy and the Ni-P layer, and rate of deposition, the thickness, the microhardness and the composition of the coating was measured. The effect of its heat treatment was also observed. It has been found that it is possible to produce a high-quality Ni-P coating on an AZ91 magnesium alloy which has no visible defects or obvious undesirable interlayers, however the heat treatment of the coating causes its cracking. To determine the corrosion resistance, a potentiodynamic measurement was performed, resulting in the finding that the Ni-P coating without heat treatment was a suitable corrosion protection. However, after heat treatment, the corrosion resistance due to cracking of the surface deteriorated to a level of bare AZ91 alloy.
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Primary Architecture / Teaching Architecture Elements
Juřicová, Magdaléna ; Veselá, Markéta (referee) ; Ponešová, Barbora (advisor)
The thesis addresses the connection of the Faculty of Architecture and the Faculty of Fine Arts in the newly designed building. Both faculties are defined primarily by practical creation and corresponding elementary teaching spaces - studios. From these basic elements literally grows the final form of the school. The design process itself is accompanied by constant changes and the search for adequate spatial expression for individual functions of the school. The final solution is the result of gradual rationalisation, finding certainties and sticking points in the proposal. In the end, the barest, most elemental, is crystallized from a multitude of variations and reflections on space.
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Building project
Benák, Dalibor ; Šlanhof, Jiří (referee) ; Mohapl, Martin (advisor)
This master's thesis focuses on a preparation of a multifunctional building in Brno, on Vídeňská street. It is based on a project that has been realized in 2005. Construction-technological preparation of this project includes the design of securing of time, financial, and human resources, project of construction site layout, a design of construction machines setup, technological manual for construction of monolithic reinforced concrete structure, plan of controls and tests for quality, and a manual for obtaining permission for using public space and protection of historical tree.
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Effect of sub-micrometer structural features on rheology of polymer nanocomposites
Lepcio, Petr ; Chodák,, Ivan (referee) ; doc.Ing.Marián Lehocký, Ph.D. (referee) ; Jančář, Josef (advisor)
Polymerní nanokompozity (PNCs) mají slibnou budoucnost jako lehké funkční materiály zpracovatelné aditivními výrobními technologiemi. Jejich rychlému rozšíření však brání silná závislost jejich užitných vlastností na prostorovém uspořádání nanočástic (NP). Schopnost řídit disperzi nanočástic je tak klíčovým předpokladem pro jejich uplatnění ve funkčních kompozitech. Tato práce zkoumá přípravu polymerních nanokompozitů v modelové sklotvorné polymerní matrici roztokovou metodou, technikou schopnou vytvářet prostorové uspořádání nanočástic řízené strukturními a kinetickými parametry přípravného procesu. Prezentované výsledky popisují rozdíly mezi změnami rheologického chování roztoku polystyrenu při oscilačním smyku s vysokou amplitudou (LAOS) vyvolanými nanočásticemi. Výsledky vedou k závěru, že vysoce-afinní OP-POSS nanočástice při nízkých koncentracích dobře interagují s PS a tvoří tuhé agregáty, zatímco nízko-afinní OM-POSS nanočástice za těchto podmínek neovlivňují deformační chování polymerních řetězců. Dále byla pozornost zaměřena na vliv použitého rozpouštědla na uspořádání nanočástic v SiO2/PMMA a SiO2/PS nanokompozitech, který je v literatuře prezentován jako parametr řídící prostorové uspořádání nanočástic v pevném stavu. Důraz byl kladen na kvalitativní rozdíly mezi „špatně dispergovanými“ shluky nanočástic, které byly na základě rheologie a strukturální analýzy (TEM, USAXS) identifikovány jako polymerními řetězci vázané nanočásticové klastry a dva typy agregátů, jeden termodynamického a druhý kinetického původu. Jednotlivé druhy agregátů se vyznačují odlišnými kinetikami vzniku a rozdílnými vlastnostmi jak mezi sebou, tak v porovnání s dispergovanými nanočásticemi. Pozorované typy disperze nanočástic byly kvantitativně posouzeny podle svých rheologických vlastností během roztokové přípravy, podle kterých byla vyhodnocena míra adsorpce polymeru na povrch nanočástic a atrakce ve vypuzeném objemu. Výsledky byly porovnány s teorií PRISM. Důležitost uspořádání nanočástic byla demonstrována na porovnání teplot skelných přechodů různých struktur při stejném chemickém složení.
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Design of Travel Trailer
Komárková, Kristina ; Rajlich, Jan (referee) ; Sládek, Josef (advisor)
This master’s thesis describes the design of the travel trailer. The main aim of the work was to create a draft of a folding trailer in off-road configuration. The final design brings a new look at the solution of folding caravans and trailers, especially in the use of inflatable technology for the construction of a folding tent liner. The basic parameters are reduced and the shape solution in the travel state is minimalistic with regard to the use of the folding system.
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DICOM protocol analysis and its utilisation in image signal processing
Valouch, Lukáš ; Přinosil, Jiří (referee) ; Šmirg, Ondřej (advisor)
This Bachelor thesis describes DICOM which is a summary of standards for handling, storing and transmitting information in medical imaging. This standard is developed by organizations ACR and NEMA, it is very large file and it contains 18 of documents which are an actual version of this norm. The last norm was got out in 2008. The most important part of this format of date and files is data image processing so called off-line communication. It follows description of implemented application in C, C++ languages by the help of Imebra library. This Imebra library is free in terms of license of GNU GPL. The resultant program is standard of DICOM from, which is described above. This program is concerned with imaging of 16 bits of dept on 8 bits of dept of display devices, for example common computer displays. This application is able to display several layers of DICOM’s pictures. Each of layers contains separated bites which are presented by importance of levels.
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Suggestion of Changes in the Purchasing Process in Relation to Supplier Management
Losart, Jakub ; Tesař, Rostislav (referee) ; Jurová, Marie (advisor)
This master`s thesis focuses on suggestion of changes in the purchasing process in relation to supplier management. Served suggestion of changes in the purchasing structure to the satisfaction of the customer in term sof delivery dates, quality and cost. Analyzes the current state of purchasing process and suggest, based on critical points further steps to improve the situation of management contracts. Evaluates the theoretical approaches and implementation conditions with all the benefits.
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Casting of manganese steels and their use
Dufka, Martin ; Šenberger, Jaroslav (referee) ; Pernica, Vítězslav (advisor)
Austenitic manganese steel, often referred as Hadfield´s steel after its discoverer, has an irreplaceable place in foundry due to its specific properties. Due to local pressures and shocks, surface of castings is hardened, but the cast core retains its toughness. Thus, manganese steel is used for castings of highly stressed machine parts that are subject to abrasive wear. This bachelor thesis is concerned about methods of production, chemical composition, influence of some alloying elements on properties and structure of steel, heat treatment, material properties, reinforcement mechanisms and types of individual deformation reinforcements. Further attention is paid to the most frequent use of manganese castings in practice.
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Family house
Staníková, Radka ; Majsniar, Michal (referee) ; Škramlik, Jan (advisor)
The subject of this diploma work is the new building of a family house at Boží Dar town, that is situated in the mountain resort. The family house has a cellar, it is two storied with an attic apartment. The building is devided into three units . The first unit is found on the first floor and is designed as an apartment. The other units are situated in the attic and are designed for a short-term or long-term renting. The house is designed of cut bricks with a ceramic ceiling construction. The perimeter wall is thermally insulated with a contact insulating system and partly covered with a stony facing. There is a saddle-shaped roof on the house. The building site is sloping north-east. All constructions are in accordance with the valid regulations and ČSN standards.
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Two-aisle hall
Zehnálek, David ; Barnat, Jan (referee) ; Bajer, Miroslav (advisor)
The aim of the thesis is the design of the supporting steel structure two-aisle hall in the town Austerlitz. Plan dimensions of the building are 72 x 54 m main body is cross-link a span of 24 and 30 m and height of the top of the aisle 8.60 and 8.75 m, which is clamped to the base structure. Binding is composed of trusses and columns. Trusses are hinged on columns. The spatial rigidity of the structure is ensured by cross braces. Roof cladding and walls will be made using sandwich panels.
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