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Hodnocení porezity u tlakově litých odlitků z Al slitin
Havel, Jiří ; Nová, Iva (oponent) ; Čech, Jaroslav (vedoucí práce)
Cílem této diplomové práce bylo vyhodnocení porezity tlakově litých odlitků, které byly odlity ve slévárně Škoda auto Mladá Boleslav ze slitiny AlSi9Cu3. K vyhodnocení a porovnání vzorků sloužilo jak moje vlastní měření, tak navázání na předešlé diplomové práce zabývající se touto problematikou a vyhotovené na škole Vysoké učení technické v Brně. Všechny měření byly také statisticky testovány.
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The effect of organic and inorganic additives on the chemico-physical properties of biopolymer substrates for tissue engineering
Kohoutek, Martin ; Muchová, Johana (oponent) ; Brtníková, Jana (vedoucí práce)
This bachelor’s thesis deals with the preparation and characterization of composite collagenous scaffolds for possible applications in both bone and skin tissue engineering with an emphasis on their chemico-physical properties. In the theoretical part, the selected components for fabrication of the scaffolds are described and later were used to fabricate 3D porous composite scaffolds in the experimental part. Altogether, four different composite collagenous scaffold types and a reference pure collagen scaffold type were prepared using the freeze-drying fabrication technique. Two scaffold types were made by combining collagen with either oxidised cellulose (OC) or carboxymethyl cellulose (CMC). The other two types of scaffolds had the same biopolymeric origin enhanced with the addition of bioceramics based on the hydroxyapatite and tricalcium phosphates. The microstructure, porosity and pore size were assessed by the scanning electron microscopy. The highest porosity and pore size were achieved by the reference purely collagenous scaffolds, followed by the collagen composites with OC and CMC. Scaffolds with the content of bioceramics had the lowest porosity and pore size, especially those containing CMC. Swelling behaviour analysis and enzymatic degradation in vitro showed, that the hydrophilicity and mass loss in the degradation process correlate with each other. The scaffolds without bioceramics were more hydrophilic and achieved greater mass loss than the scaffolds containing bioceramics. The pure collagen was in the between the two groups. Scaffolds containing CMC achieved greater mass loss and hydrophilicity than their OC counterparts. In terms of mechanical properties, scaffolds with bioceramics achieved higher compressive strength in the wet state than the other three scaffold types. The mechanical properties were generally better for scaffolds with lower porosity and lower hydrophilicity.
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Hodnocení porezity u tlakově litých odlitků z Al slitin
Havel, Jiří ; Nová, Iva (oponent) ; Čech, Jaroslav (vedoucí práce)
Cílem této diplomové práce bylo vyhodnocení porezity tlakově litých odlitků, které byly odlity ve slévárně Škoda auto Mladá Boleslav ze slitiny AlSi9Cu3. K vyhodnocení a porovnání vzorků sloužilo jak moje vlastní měření, tak navázání na předešlé diplomové práce zabývající se touto problematikou a vyhotovené na škole Vysoké učení technické v Brně. Všechny měření byly také statisticky testovány.
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