Photoresist is a light sensitive material whose physical and chemical properties change when exposed to light. Photoresist makes it possible to transfer the image of a circuit pattern directly onto a substrate. The first part of this work deals with developing a photo process using AZ 1518 and AZ P4330 positive resists on SiC substrate. The aim was to determine the optimal spin parameters, softbake time, and exposure time for these resists matching their thickness. AZ 1518 process was developed for a 1.76 um thickness and AZ P4330 for 4.3 um thickness. With the parameters obtained the resist had about 5% of difference in thickness across a wafer surface. The absence of practical wet chemical etching of SiC is the reason for the study of dry, plasma etching of SiC in this thesis. There is an interest in photoresist as an etch mask because it is cheap, easy to deposit, pattern and remove. However its ability to mask etching of materials with high bond strength like SiC is limited. This work examines its selectivity under various etching parameters and determines the effect of increase in the RF power on selectivity, SiC etch rate and photoresist etch rate.

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<p>The application aluminum sheet alloy for light vehicle development was limited by the high cost of alloy fabrication. The impurity iron, which is easily picked up during fabrication, deteriorates its formability. The sheet alloy produced by continuous casting techniques was showing lower in-service performance than the one produced with traditional high-cost direct-chill casting technique. Therefore, enhancing the general formability of the aluminum alloy became .the aim of many researchers and engineers in past decades.</p><p>This project was launched to detect a possible modification effect of rare-earth (RE) element on a Al-Mg-Fe alloy, which is a simplified AA5754 alloy. Cerium was chosen as the RE element to test with. The influence of this rare-earth element on the alloy grain microstructure, phase morphology, and corresponding mechanical behavior was investigated.</p><p>It was found that cerium had a modification effect on the phase morphology to some extent. Its addition provided a great grain refinement in as-cast alloys. However, after thermo-mechanical processing, this effect would be eliminated by the small broken particles and recrystallized fine grains. It was found that the mechanical performance of the cerium-containing AA5754 was neither enhanced nor deteriorated. The AA5754 alloy remained non-heat-treatable after the addition of cerium.</p> / Thesis / Master of Applied Science (MASc)

No / This title provides a comprehensive and authoritative review on recent advancements in the application and use of composite scaffolds in tissue engineering. Chapters focus on specific tissue/organ (mostly on the structure and anatomy), the materials used for treatment, natural composite scaffolds, synthetic composite scaffolds, fabrication techniques, innovative materials and approaches for scaffolds preparation, host response to the scaffolds, challenges and future perspectives, and more. Bringing all the information together in one major reference, the authors systematically review and summarise recent research findings, thus providing an in-depth understanding of scaffold use in different body systems.