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Foam materials for impact absorption
Pilát, Adam ; Grim, Robert (referee) ; Löffelmann, František (advisor)
This diploma thesis discusses the topic of a polymeric foam impact energy attenuation system for emergency recovery parachute landing. It aims to improve the crew safety during emergency landing. The thesis contains research on methods of impact energy attenuation in aerospace. Research on existing use cases of such methods and systems is included. A computational model of foambag is proposed based on study of methods of polymeric foams mechanical characteristics modelling. The computational model is capable of identifying acceptable geometrical configurations of foambag based on inserted foam parameters, aircraft parameters and impact conditions. Experimental measurement of polyurethane foam with short reaction time is conducted. Identified material characteristics are used to improve the mathematic model. Based on the results from the mathematic model using the measured foam characteristics, a conception design is proposed. Important design points are identified and two possible approaches are proposed. The thesis results in conclusion that it is possible to design working energy attenuation system based on polymeric foam. There are however problems that need to be overcome to allow for real-life application of such system. These problems include mainly securing reliable function in any appliable conditions and system maintenance.
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Heat insulating moulded refractory materials
Novotný, Radoslav ; Lang, Karel (referee) ; Raschman,, Pavel (referee) ; Havlica, Jaromír (advisor)
Doctoral thesis is focused on the study, research and development of heat insulating moulded refractory materials. The replacement of shaped instead of unshaped refractories is recently and strongly industrially demanded and belongs to ongoing research topics. With the increasing demand of energy savings, the excellent insulation properties are essential. The insulating properties of castables are the result of targeted porosity formation. The porosity is coming from the controlled air intrusion into material resulted to foamed structure. The foaming process was achieved by mixing of separately prepared aqueous foam into raw castable slurry or by in situ foaming of intensively mixed castable slurry with the surfactant additive. Nevertheless, the study of foam behaviour and the influence of additives on binder hydration and setting processes (i.e. calciumaluminate cement) was substantial for successful preparation of the experimental samples. The two types of the experimental samples were prepared. The first one was based on mixing of kaolin slurry with pre-prepared aqueous foam, whereas the de-aglomeration ability of kaolin specie was utilized to water-particle film formation. In situ foaming of multicomponent system is the second one. The both processes brought some negative attributes, so the optimal properties of prepared castables were achieved by their combination.
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Rendering of Terrain and Water Surface in a Computer Game
Kopecký, Marek ; Kajan, Rudolf (referee) ; Herout, Adam (advisor)
This bachelor's thesis deals with rendering of water and terrain, which is a key part of many computer games and simulations. The resulting application runs fluently and is powered by XNA Framework. Rendering of terrain includes multi-texturing and lighting. The water simulation includes reflection and refraction of ray on water surface. Foam is rendered on the bank of water. Water waves are computed using the inverse discrete Fourier transform.
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Kompozitní pěnové nosiče pro tkáňové inženýrství kostí
Kuntová, Henrieta ; Rampichová, Michala (advisor) ; Krulová, Magdaléna (referee)
The goal of my work was to introduce the fast pacing field of tissue engineering with focus on bone regeneration. Tissue engineering could be a future alternative to the currently used conventional approaches that suffer from healing failures. Due to increasing demand for bone tissue replacement damaged by degenerative diseases or injuries, many laboratories have attempted to come up with solutions in a form of artificial constructs. In the present light of interest are composite scaffolds usually made of polymer and ceramic combinations. Their main advantage is that they combine elasticity and tensile strength of a polymer with bioactivity and mechanical hardness of a ceramic, while removing drawbacks of each material. Powered by TCPDF (www.tcpdf.org)
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Design sedacího nábytku
Kuracinová, Katarína
Master thesis about seating furniture is divided into two parts . The theoretical part includes topics such as ergonomics and standards. Introduction is explaining the terms and ideas with which the whole work is dealt with. The theoretical part includes a chapter in which is explained and shown the inspiration. During the creating process I also focused on the psychology of products in general and its application to a specific product. In this chapter I devote more material on how to use information that I collected to meet predetermined specifications. The practical part contains sketches, selection of materials, visualisations. It also contains technological process of creating a prototype. Master thesis ends with general evaluation and discussion.
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Kompozitní pěnové nosiče pro tkáňové inženýrství kostí
Kuntová, Henrieta ; Rampichová, Michala (advisor) ; Krulová, Magdaléna (referee)
The goal of my work was to introduce the fast pacing field of tissue engineering with focus on bone regeneration. Tissue engineering could be a future alternative to the currently used conventional approaches that suffer from healing failures. Due to increasing demand for bone tissue replacement damaged by degenerative diseases or injuries, many laboratories have attempted to come up with solutions in a form of artificial constructs. In the present light of interest are composite scaffolds usually made of polymer and ceramic combinations. Their main advantage is that they combine elasticity and tensile strength of a polymer with bioactivity and mechanical hardness of a ceramic, while removing drawbacks of each material. Powered by TCPDF (www.tcpdf.org)
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Heat insulating moulded refractory materials
Novotný, Radoslav ; Lang, Karel (referee) ; Raschman,, Pavel (referee) ; Havlica, Jaromír (advisor)
Doctoral thesis is focused on the study, research and development of heat insulating moulded refractory materials. The replacement of shaped instead of unshaped refractories is recently and strongly industrially demanded and belongs to ongoing research topics. With the increasing demand of energy savings, the excellent insulation properties are essential. The insulating properties of castables are the result of targeted porosity formation. The porosity is coming from the controlled air intrusion into material resulted to foamed structure. The foaming process was achieved by mixing of separately prepared aqueous foam into raw castable slurry or by in situ foaming of intensively mixed castable slurry with the surfactant additive. Nevertheless, the study of foam behaviour and the influence of additives on binder hydration and setting processes (i.e. calciumaluminate cement) was substantial for successful preparation of the experimental samples. The two types of the experimental samples were prepared. The first one was based on mixing of kaolin slurry with pre-prepared aqueous foam, whereas the de-aglomeration ability of kaolin specie was utilized to water-particle film formation. In situ foaming of multicomponent system is the second one. The both processes brought some negative attributes, so the optimal properties of prepared castables were achieved by their combination.
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Rendering of Terrain and Water Surface in a Computer Game
Kopecký, Marek ; Kajan, Rudolf (referee) ; Herout, Adam (advisor)
This bachelor's thesis deals with rendering of water and terrain, which is a key part of many computer games and simulations. The resulting application runs fluently and is powered by XNA Framework. Rendering of terrain includes multi-texturing and lighting. The water simulation includes reflection and refraction of ray on water surface. Foam is rendered on the bank of water. Water waves are computed using the inverse discrete Fourier transform.
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Stanovení koloidní stability u vybraných druhů piv
Petráň, David
Unlike majority of sorts of alcoholic drinks beer is considered significantly un-stable. This thesis examines the factors influencing the stability of beer, especially phys-ical-chemical, primarily content of polyphenols and potential of components of beer to form haze. Twenty eight samples from differently large breweries were processed (Černá Hora, Poutník Pelhřimov, Pegas, Richard and minibrewery of Mendel University in Brno). The total content of polyphenols was determined using the Folin-Ciocalteu method (spectrophotometrically at 750 nm) and subsequently expressed in the content of ferulic acid, which served as a standard for purposes of this study. The average con-tent of polyphenols was in Černá Hora Sklepní 338,5 mg.l-1, in light lager beer Poutník 370 mg.l-1, in light lager beer Pegas 694,5 mg.l-1, in light lager beer Richard 726,3 mg.l-1, in wheat beer from Mendel University in Brno 562 mg.l-1 and in Rauch from Mendel University in Brno 817 mg.l-1. Turbidity of beer for consumption and potential of beer components to form haze using EBC test was also assessed. Both types of turbidity were measured by turbi-dimeter at 620 nm using Helm BaSO4 standard and based on the measured values were compared with the established range of haze. Finally, the results were discussed and assessed physical-chemical stability of observed beers.
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