Thesis (M.S.)--Ohio University, August, 1995. / Title from PDF t.p.

Thesis (Ph. D.)--University of Washington, 1996. / Vita. Includes bibliographical references (leaves [133]-142).

Thèse (M.Eng.) -- Université du Québec à Chicoutimi, 2005. / La p. de t. porte en outre: Mémoire présenté à l'Université du Québec à Chicoutimi comme exigence partielle de la maîtrise en ingénierie. CaQCU Bibliogr.: f. 138-144. Document électronique également accessible en format PDF. CaQCU

Thesis (M.S.)--Portland State University, 2005. / Includes bibliographical references (leaves 29-30). Also available online (PDF file) by a subscription to the set or by purchasing the individual file.

Thesis (M.S.)--Portland State University, 2005. / Includes bibliographical references (leaves 29-30).

Esta dissertação realiza uma pesquisa em artes visuais, na área de poéticas visuais e, como tal, a produção artística da autora é o ponto de partida. Os procedimentos empregados na construção dos trabalhos são revisitados, procurando compreender o processo de trabalho, as referências mais recorrentes (como documentos de trabalho) e suas implicações conceituais. O objeto de estudo desta pesquisa refere-se a espessura, física e conceitual, de imagens instauradas a partir da acumulação e sobreposição de fragmentos capturados. A pesquisa desencadeou reflexões acerca da apropriação e a conseqüente formação de uma coleção; a reordenação de fragmentos, a sobreposição e o apagamento como conceitos operatórios; e a imagem construída em camadas. / This dissertation performs a research in visual arts, in the area of visual poetics, as such, the artistic production of the author is the starting point. The procedures used in the construction of the works are revisited, seeking to understand the work process, the most recurring references (such as working documents) and its conceptual implications. The object of this research refers to the thickness, physical and conceptual, of images produced from the accumulation and overlapping of captured fragments. The research triggered discussions about appropriation and the consequent formation of a collection; the reordering of fragments, overlapping and erasure as operational concept; and the image built in layers.

Les procédés de dépôt de couches minces optiques par voie physique ou par voie sol-gel présentent par nature des limitations pour la réalisation de revêtements épais (>1 µm) et ont alors recours à des empilements multicouches pour la préparation de miroirs diélectriques ou de polariseurs. C'est pour ces raisons qu'il est intéressant d'étudier les conditions permettant d'augmenter l'épaisseur critique des films sol-gel notamment. Après avoir étudié la capacité d'empilements des couches colloïdales, trois principaux paramètres ont été identifiés permettant d'augmenter l'épaisseur critique d'empilements monomatériaux et multimatériaux. Ces paramètres sont : l'épaisseur déposée,les interactions chimiques entre les particules et le temps de séchage du film. Ils influencent la microstructure des empilements et par conséquent les propriétés optiques et mécaniques. En contrôlant tous ces paramètres, nous avons montré qu'il est possible de préparer des empilements colloïdaux de fortes épaisseurs ouvrent la voie à la préparation sol-gel de miroirs de hautes performances et/ou de polariseurs. En outre, un développement spécifique de méthodes de caractérisations optiques et mécaniques a été nécessaire pour l'étude de ces films sol-gel, à la fois minces et fragiles. / Main optical deposition processes, physical vapor deposition or sol-gel, exhibit difficulties of achieving thick coatings (>1 µm) and to build multilayer stacks (dielectric mirrors, polarizers). For these reasons, we have studied the conditions to enable a significative increase of deposited sol-gel films thickness. Three main parameters have been evidenced enabling the control of the stacking ability : single layer deposited thickness, chemical interactions beetween nanoparticles and coating drying time. We have shown that these parameters depend on the sol composition and on deposition conditions (process) and that the microstructure of single material stacking is influenced. Optical and mechanical properties of sol-gel films have been studied and optimized regarding these different material and process parameters. For this reason, optical and mechanical characterization techniques have been specifically developed and can now be used for fragile and thin film characterization. In controlling all these parameters, it is now possible to prepare multilayer colloidal stack with high thicknesses enabling the fabrication of high-performance mirrors and polarizers.

Complex regional pain syndrome (CRPS) is a chronic neuropathic pain disorder characterized by both central and peripheral symptoms that can be debilitating in children. CRPS treatment typically consists of intensive physical, occupational, and psychological therapy with evidence supporting the efficacy of this approach. Among these outcomes, some patients report significant improvements in pain while others report no change. Identifying baseline predictors of treatment resistance would refine our treatment approach and provide additional targets for intervention. The current study examined baseline brain structure via cortical thickness and gray matter volume (GMV) in 29 pediatric CRPS patients enrolled in an intensive pain rehabilitation program. All participants underwent MRI using a high-resolution T1-weighted sequence. Patients were categorized as pain treatment “responders” (n=19) or “non-responders” (n=10) based on change in reported pain levels from admission to follow up. Compared to treatment responders, non-responders demonstrated significantly less GMV in the bilateral nucleus accumbens p<0.05 and right: putamen p<0.01, pallidum p<0.05, and amygdala p<0.05. Furthermore, treatment non-responders exhibited significant cortical thickening in the left anterior insular cortex and medial frontal gyrus, and cortical thinning in the bilateral precentral gyrus and superior frontal gyrus; right: middle frontal gyrus, fusiform gyrus, inferior temporal gyrus, middle temporal gyrus, and anterior prefrontal cortex; and left: parahippocampal gyrus. Though we did see significant thinning of the primary motor cortex in treatment non-responders compared to responders, the majority of our findings were localized to regions associated with reward, motivation, learning, and emotion. We, therefore, postulate that treatment non-responders, when compared to responders, likely have an intrinsically reduced reward responsiveness, diminished motivation, and impaired learning, overall contributing to their negative treatment outcomes and chronification of pain. In conclusion, these baseline differences overall suggest these regional morphometric alterations may potentially serve as predictors of treatment response in pediatric CRPS. Furthermore, these areas may also indicate possible targets for future treatment.

OBJECTIVES: Evaluate the effect of different veneering techniques, Y-TZP core thicknesses, and firing cycles with different heat rates and holding times on the mechanical properties of veneering porcelain. MATERIALS AND METHODS: Biaxial flexural strength and Thermal shock resistance tests were conducted to evaluate the mechanical properties of veneer porcelain. Core material, Y-TZP and two porcelain veneers, IPS e.max Ceram and VITA VM9, were used in this study. Vita YZ zirconia blocks were sectioned and sintered to provide slabs of 1.65, 3.25, and 6.50mm in thickness. Two techniques were used to fabricate VITA VM9 and e.max Ceram porcelain veneer porcelain discs, Hand Layered, mixing powder with manufacturer’s molding liquid, condensed in a mold, and Pressed, pressing powder uniaxially in a mold. A layer of carbon paint was applied to the zirconia to allow removal of the porcelain discs. For thermal shock test the veneering porcelain fired on the Y-TZP core with a wash layer. After the veneer discs were fabricated, they were sintered: (1) According to the manufacturer’s instructions; (2) Two different cycles with slower heat rate and longer holding than the recommended value. Biaxial flexural strength was determined using a universal mechanical tester. Thermal shock tests were performed using a Pober thermal shock device. Statistical analysis was conducted for all tests using ANOVA and Tukey post hoc test at p= 0.05. RESULTS: There was significant effect from changes of YZ Core thickness, firing cycle, and veneer technique on the mechanical properties of porcelain veneer. The veneering technique had the largest impact on the mechanical properties of veneer porcelain followed by firing cycle, followed by YZ core thickness. In using different firing cycles with different heat rates and holding times, slowing the heating rate had more influence on the mechanical properties of veneer porcelain. In measuring the surface temperature of the Y-TZP/VITA VM9 assembly, the specimen surface temperature was coincidental with the furnace programmed firing cycle using a slower heating rate firing cycle. CONCLUSIONS Veneering technique, slower heat rate firing cycle, and Y-TZP core thickness have significant impact on veneering porcelain mechanical properties. / 2018-09-28T00:00:00Z

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