Thèse numérisée par la Direction des bibliothèques de l'Université de Montréal.

Call number: LD2668 .T4 1986 P44 / Master of Science / Animal Science and Industry

The sub-surface region of chemical vapour deposition (CVD) diamond was transformed by C+ ion implantation followed by isochronal annealing up to 1200 oC. Different implantation regimes and with different energies at different implantation temperatures would give different thicknesses were studied. This enabled a study in the evolution of the stiffness of the damaged layer as a function of annealing. The technique of choice for this study was the non-destructive Brillouin light scattering (BLS) utilizing two scattering geometries; indirectly scattered phonons (Kr¨uger-type geometry) for temperature anneals up to 600 oC, and the conventional surface ripple mechanism up to 1200 oC. It has been argued that surface acoustic waves (SAW) on a transparent medium are enhanced by applying a thin metallic reflective layer on the surface, this study has showed that opacity of the substrate is key. In fact, bulk modes with SAW-like characteristics emanating from indirect photon scattering off phonons after reflection at the smooth reflective back of the sample dominated down to transmission below 5% which was observed after annealing between 500-600 oC (low annealing temperatures). The other complementing techniques employed to understand the changing structure of the ion implanted diamond were Raman spectroscopy, electromagnetic transmission in the visible range, electron energy loss spectroscopy (EELS) and high-resolution transmission electron microscopy (HRTEM) in addition to theoretical techniques: transport of ions in matter (TRIM), finite element modelling (FEM) and elastodynamic Green’s functions. Although the electronic techniques showed a structurally changing material at the low annealing temperatures, the optical ones did not show significant changes in the ion-damaged material possibly due to lack of distinct interface between the pristine diamond and the ion irradiated region at these lower annealing temperatures.

No presente trabalho, usando ensaios de remoção por tração, o objetivo foi avaliar a eficiência de 4 agentes (fosfato de zinco S. S.White, ionômero de vidro Ketac Cem Easymix, resina composta RelayX Luting 2 e resina acrílica especial Panavia 21 TC) usados para fixar coroas totais de NiCr a munhões tronco-cônicos, usinados em liga de Ti-6Al-4V. Dentre os cinqüenta munhões utilizados, 40 permaneceram com sua superfície original altamente lisa (como vieram de fábrica) e foram distribuídos em grupos de 10, para cada agente cimentante; no grupo dos 10 restantes existiu uma modificação por irradiação com LASER e cimentação apenas com fosfato. Os ensaios mecânicos foram realizados em uma máquina universal MTS 810, na velocidade de 0,5 mm/min. A respectiva Análise de Variância (ANOVA) apontou existir diferença significante entre os grupos e o teste de Tukey (p<0,05) também mostrou diferenças significantes entre eles, exceto nas comparações original/fosfato versus original/RelayX e original/fosfato versus original/KetcCem. Para os munhões não-irradiados, o melhor desempenho foi apresentado pela resina Panavia 21 (1.127,996 N); a resina composta RelyX (478,197 N) mostrou comportamento similar apenas ao do fosfato (430,662 N), o qual apresentou desempenho semelhante ao ionômero de vidro KetacCem (227,705 N). A modificação da superfície do munhão fez com que a magnitude da resistência à tração das coroas cimentadas com fosfato aumentasse para 1.514,872 N. / By means of tensile essays, NiCr total crowns were removed from usinated tronco-conical abutments composed by an Ti-6Al-4V alloy; the performance of 4 cementig agents (S. S. White zinc phoshate, Ketac Cem Easymix glass ionomer, RelayX Luting 2 composite resin and Panavia 21 TC special acrylic resin) was evaluated. Among a total of 50 abutments, 40 were used with it surface presenting high smoothness (as they come from manufacturer) and distributed in groups of 10 elements, each group for each cementing agent; the other 10 abutments had had its surfaces modified by LASER and were used only with phosphate. The mechanical essays were developed at a MTS 810 universal machine, adjusted to a 0.5 mm/m velocity. The ANOVA applied to data pointed out the existence of significant differences between groups; the subsequent Tukey´s test (p<0.05) also detected significant differences, except at comparisons of original/phosphate versus original/ RelayX and original/phosphate versus original/ KetacCem. To non-irradiated abutments, the better performance was presented by Panavia 21 (1,127.996 N); RelyX (478.197 N) showed itself similar only to phosphate (430.662 N), wich had a performance similar to that of KetacCem (227.705 N). The referred LASER irradiation promoted an increased resistance to the phosfate, which reached 1,514.872 N.

Objetivo: Medir a expressão da integrina av~3 no endométrio de mulheres usuárias do DIUT200. Desenho: Estudo observacional controlado. Local realizado: Centro de saúde secundário e laboratório universitário. Pacientes: Treze mulheres sadias e férteis (controles) e treze usuárias do DIUT200 (casos). lntervençao: Biópsia endometrial realizada entre o 6°-1 0° dia pós-ovulatório do ciclo menstrual. Principal Desfecho Avaliado: A expressão da integrina av~3 através do HSCORE em amostras endometriais criopreservadas. Resultados: O HSCORE das usuárias do DIUT200 foi 0,9 ± 0,7 (média± DP), enquanto que o dos controles foi 2,13 ± 0,7 (média ± DP) (p = 0.001 Teste-t de Student). Todos os controles foram positivos para a expressão da integrina av~3. mas as usuárias do DIUT200 não apresentou positivdade para a integrina av~3 em 38,5% dos casos (p = 0,03 Teste Exato de Fisher). Conclusao: Os resultados apoiam a teoria que o DIUT200 de cobre também tem um mecanismo de ação que interfere diretamente com a receptividade uterina e a implantação. / Objective: To measure the expression of avf33 integrin in the endometrium of IUDT200 users. Design: Observational controlled study Setting: Secondary health care center and University laboratory Patients: Thirteen healthy fertile women (contrais) and thirteen IUDT200 users (cases). lntervention: Endometrial biopsy on postovulatory day 6-1 O of the menstrual cycle. Main Outcome Measure: The expression of avJ33 by HSCORE on cryopreserved endometrial sections. Results: The HSCORE for IUD users was 0.9 ± 0.7 (mean ± SEM), while for contrais was 2.13 ± 0.7 (mean ±SEM) (p < 0.001 Teste-t de Student). Ali contrais were positiva for avJ33, but women with IUD did not express avl33 integrin in 38.5% of the cases (p < 0.03 Fisher's exact test). Conclusion: These results support the theory that copper IUD T200 also has a mechanism of action that is directed at interference with uterine receptivity and implantation.

Aim: To describe innovative uses of catheter based treatment in a variety of native and post surgical stenoses in children and young adults with congenital heart disease. Background: Cardiac catheterization in man was first described 1929 and since then there has been a drive to develop endovascular techniques to investigate and treat both congenital and acquired heart disease. Many of the advances are being made in congenital heart disease. Methods: A number of congenital cardiac stenotic lesions were studied including baffle obstruction after atrial switch for transposition of the great arteries, aortic stenosis in infants, coarctation of the aorta, peripheral pulmonary artery stenosis and superior vena caval obstruction. The use of angioplasty balloons, cutting balloons, stents and alternative catheter approaches were investigated for these lesions. Results: Following atrial redirection surgery for transposition of the great arteries balloon angioplasty improved baffle haemodynamics. The technique of anterograde balloon dilation of the aortic valve was developed and had superior outcomes in terms of aortic insufficiency compared to a retrograde approach in neonates with severe aortic valve stenosis. In an animal model of peripheral pulmonary arterial stenosis, the application of cutting balloon angioplasty produced effective relief in a controlled fashion. Balloon mounted stents were used in patients with native and post surgical coarctation of the aorta with significant relief of stenosis and relief of hypertension. Finally, a group of patients with superior vena obstruction syndrome after surgical repair of partial anomalous pulmonary venous drainage had successful treatment using balloon mounted stents. Conclusions: Catheter based treatment of congenital and post surgical vascular stenoses of the heart and great arteries using angioplasty balloons, cutting balloons and balloon mounted stents is safe and appears to be effective in the short and medium term. It may represent a useful alternative to surgery and will reduce the number of surgical procedures required over a lifetime. Future directions will include bio-absorbable stents and hybrid techniques involving surgery.

O trabalho tem como objetivo descrever a implantação dos serviços de álcool e drogas e analisando a experiência vivida no processo de implantação, por seus coordenadores.Realizamos uma investigação com os coordenadores dos serviços utilizando um questionário semi-estruturado adaptado para descrever a necessidade da implantação. O instrumento contava com 7 questões abertas e foi utilizado a entrevista gravada como recurso e permitido uma abordagem qualitativa fundamentada no estudo de caso. A pesquisa foi realizada entre Setembro de 2002 e janeiro de 2003 envolvendo os profissionais de nível superior que exerciam a função de coordenadores. Verifica-se pelos resultados obtidos que a demanda reprimida e a insatisfação dos usuários de álcool e seus familiares sendo tratados em outros serviços de saúde mental gerava insegurança nestes profissionais que não eram preparados para este tipo de atendimento pressionando os governantes a criarem os serviços especializados.Esses serviços foram criados com a proposta de tratar o sujeito dentro do contexto ambulatorial sem excluir o usuário de seu meio social. Quanto ao modelo a ser implantado foi o médico com a inserção de novos modelos como o psicológico social e cultural, e priorizando uma equipe multidisciplinar respeitando as suas especificidades.Finalmente o conhecimento produzido mostra-nos que os serviços abertos em drogas e álcool têm se constituído um avanço neste tipo de tratamento, mas precisa ainda capacitar um maior número de profissionais para trabalhar nesta área e buscar novas alternativas de tratamento em seus vários modelos para indicar ações preventivas e terapêuticas para intermediar essa condição cada vez mais aflitivas que é a demanda de usuários em busca se soluções para a dependência. / The study has as objective to describe the implantation of services to deal with alcohol and drugs and to analyze the experience lived by the coordinators in the process implantation.We accomplished an investigation with the coordinators of the services using a semi-structured questionnaire adapted to describe the need of the implantation.The instrument counted with eight open subjects and it was used a recorded interview as resource and it was allowed a qualitative approach based on the study of case. The research was accomplished between September of 2002 and January of 2003 involving the professionals of superior level who had the coordinator position. It was verified by the obtained results, that the repressed demand and the alcohol users' dissatisfaction and their relatives being treated in other services of mental health, generated insecurity in those professionals who were not prepared for this kind of attendance pressing, this way, the government to create the specialized services. Those services were created with the proposal of treating the subject inside the ambulatory context, without excluding the user from his social environment. As for the model to be implanted it was the medical one, with an insertion of new models such as the psychological social and cultural, and giving priority to a team multidisciplinary team respecting their specificities. Finally the produced knowledge showed us that the services opened to treat drugs and alcohol dependents have been showing a progress in this kind of treatment, but these services still need to qualify a larger number of professionals to work in this area and to look for new treatment alternatives in its several models to indicate preventive and therapeutic actions to intermediate that condition more and more distressing that is the users' demand in search of solutions for the dependence.

by Ranganathan Venugopal. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2001. / Includes bibliographical references (p. 150-165). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Mode of access: World Wide Web. / Abstracts in English and Chinese.

by Wong Siu-Kuen. / Thesis (M.Phil.)--Chinese University of Hong Kong. / Bibliography: leaves 76-92.

Hui Yat Wai. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1993. / Includes bibliographical references (leaves 106-108). / Acknowledgments / Abstract / Chapter 1. --- Introduction --- p.1 / Chapter 2. --- Theory / Chapter 2.1 --- Optical Waveguide --- p.4 / Chapter 2.1.1 --- Optical Waveguide Classification / Chapter 2.1.2 --- Theoretical Analysis of 2-dimensional Step Index Waveguides / Chapter 2.2 --- Optical Waveguides Measurement --- p.18 / Chapter 2.2.1 --- Refractive Index Measurement / Chapter 2.2.2 --- Loss Measurement / Chapter 2.3 --- Ion Implantation and Annealing --- p.36 / Chapter 2.4 --- Refractive Index Change --- p.40 / Chapter 3. --- Equipments and Their Experimental Setup / Chapter 3.1 --- Light Source-Laser Diode --- p.42 / Chapter 3.2 --- Ellipsometry Measurement System --- p.45 / Chapter 3.2.1 --- Ellipsometry Measurement System and its Existing Problems / Chapter 3.2.2 --- Improvement of the Original System / Chapter 3.2.3 --- System Calibration / Chapter 3.3 --- Reflectance Measurement System --- p.51 / Chapter 3.3.1 --- System Design and Setup / Chapter 3.3.2 --- System Calibration / Chapter 3.4 --- End-Coupling Measurement System --- p.56 / Chapter 3.4.1 --- System Setup / Chapter 3.4.2 --- System Calibration / Chapter 4. --- Experiment / Chapter 4.1 --- Samples Preparation --- p.77 / Chapter 4.2 --- Refractive Index Measurement by Ellipsometer --- p.80 / Chapter 4.3 --- Refractive Index Measurement by Reflectance --- p.84 / Chapter 4.4 --- Waveguide Measurement --- p.88 / Chapter 4.4.1 --- Fiber-Waveguide Coupling / Chapter 4.4.2 --- Lens-Waveguide Coupling / Chapter 5. --- Results and Discussion / Chapter 5.1 --- Refractive Index Change and Waveguide Formation --- p.94 / Chapter 5.2 --- Mechanism of Refractive Index Change --- p.100 / Chapter 6. --- Conclusion --- p.103 / Chapter 7. --- Improvement and Extension --- p.105 / Reference --- p.106 / Appendices / Chapter A. --- Thick.m --- p.VI / Chapter B. --- Distrib.m --- p.IX