The purpose of this dissertation is to examine the occurrence of facial fractures in automotive collisions and to determine the tolerance of the facial bones to blunt impact. The effects of restraint use, impact severity and impact direction on facial fractures were evaluated using the NASS-CDS database. The association between brain injury and facial fractures was also examined. The tolerance of the frontal bone, nasal bone, maxilla and mandible was determined using the flat surface of a cylindrical impactor. The influence of anthropometric measures and geometrical descriptors on the tolerance of the facial bones is also presented. The force-displacement response of each impacted region was also determined and response corridors were created. These corridors were used to evaluate the biofidelity of the FOCUS headform under the same impact conditions. Mathematical models were also created to predict the force and displacement resulting from facial impact. The data contained in this dissertation can be used to determine the risk of facial fracture as a function of impact force and evaluate the biofidelity of models simulating facial impact. / Ph. D.

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This dissertation was undertaken in collaboration with the Nisga’a First Nation of northwestern British Columbia to document their traditional plant knowledge. This information was gathered through collaborative audio recorded open-ended discussion with 21 Nisga’a elders, supplemented with material from the published literature and archival sources. Background information with respect to the Nisga’a culture, language, geography, plant classification and resource management is documented in the past and as exercised today. Nisga’a names or uses of 110 plant species are described. Of these, 72 species were documented as having been used for food, 52 for medicinal purposes; 12 for spiritual purposes and 70 for technological purposes. The role of plants in traditional Nisga’a culture is further explored through comparisons of plant distribution, plant names and pre-contact trade between the Nisga’a and their immediate neighbours, the Gitxsan, Tsimshian, Haida, Tahltan and Tlingit First Nations. Maps are presented which highlight the distribution of seven plant species traditionally important in these cultures: Shepherdia canadensis (soapberry), Vaccinium membranaceum (black huckleberry), Oplopanax horridus (devil’s club), Corylus cornuta (beaked hazelnut), Malus fusca (Pacific crabapple), Veratrum viride (false hellebore), and Taxus brevifolia (western yew). Currently, one of the plants most important to the Nisga’a is wa’ums or devil’s club (Oplopanax horridus). Devil’s club stems were measured in clearcuts of different ages to examine how quickly this important spiritual and medicinal species recovers after logging. Results suggest that although devil’s club does persist after clearcut logging, stems of a suitable size are rarely found in cutblocks less than 10 years old and that time since logging only partially accounts for the persistence or recovery of this species. The dissertation concludes with a discussion of historical Nisga’a plant knowledge. The gender of those who have held and transmitted traditional knowledge and the gender of present knowledge holders is tabulated and discussed. Results suggest that although both men and women hold and pass on traditional knowledge, women were and still are more commonly involved in its transmission to the next generation. Current plant uses are highlighted and prospects for the sustainable use of plants for personal and commercial purposes are discussed. / Graduate

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The development of organic materials displaying room-temperature phosphorescence is a research field that has attracted more and more attention in the last years. Most studies focus on designing or optimizing emitter molecules to increase the phosphorescent performance in host:emitter systems. Rarely, the overall thin-film preparation routines are compared with respect to their triplet-state luminescence yield. Herein, different film preparation techniques are investigated using the very same emitter molecule. A variation of host polymer, post-annealing temperature, and fabrication procedure is evaluated with respect to the obtained phosphorescent lifetime, photoluminescent quantum yield, and phosphorescence-to-luminescence ratio. This study elaborates the importance of different film preparation techniques and gathers a concise set of data which is helpful to anyone optimizing the phosphorescence of a particular system.