Thesis (M.L.A.)--University of Hong Kong, 2001. / Includes bibliographical references. Also available in print.

Thesis (M.A.)--University of Leicester in association with University of Hong Kong, 1994. / Includes bibliographical references (leaves 126-136). Also available in print.

Universiẗat, Diss., 2001--Bonn.

Universiẗat, Diss., 2005--Freiburg (Breisgau). / Erscheinungsjahr an der Haupttitelstelle: 2004.

Canada is a nation known for being highly multiethnic due to its rich history of immigration. But many immigrant parents struggle with acculturation and, at the same time, they are faced with the challenge of raising their children in a new country. This study explored the process of transition among newcomer mothers living in Winnipeg. Using a qualitative approach, ten in-depth interviews were conducted to gain a greater understanding of the process that parents go through as they learn about a particular disciplinary approach - Positive Discipline in Everyday Parenting (PDEP). Four main themes emerged: 1) the meaning of parenting; 2) a new vision of parenting; 3) conflicting notions of discipline; and 4) navigating the acculturation gap. Each primary theme had several sub-themes that expressed the process of transition to a new parenting context. Many mothers had experienced corporal punishment as children but none approved of it. They explained that PDEP had provided them with a new non-violent vision of parenting. Mothers described the parenting changes they had made and how their confidence had increased since learning about PDEP. They also described the impact that the loss of extended family support had on parenting dynamics. Although some of the mothers observed that the PDEP program had not decreased the acculturation gap between them and their children, it had helped them to better understand their children’s perspectives. The implications of the findings for professionals who support newcomer parents are discussed. / February 2016

Submitted by SHEILA CELIA MONDRAGÓN CONTRERAS null (sheilamondragon90@gmail.com) on 2018-01-23T00:06:22Z No. of bitstreams: 1 SHEILA CELIA MONDRAGÓN CONTRERAS(1).pdf: 2157978 bytes, checksum: b607b65c3fd9d6ea2847c3311b4b6805 (MD5) / Approved for entry into archive by Silvana Alvarez null (silvana@ict.unesp.br) on 2018-01-23T20:07:33Z (GMT) No. of bitstreams: 1 contreras_scm_me_sjc.pdf: 2157978 bytes, checksum: b607b65c3fd9d6ea2847c3311b4b6805 (MD5) / Made available in DSpace on 2018-01-23T20:07:34Z (GMT). No. of bitstreams: 1 contreras_scm_me_sjc.pdf: 2157978 bytes, checksum: b607b65c3fd9d6ea2847c3311b4b6805 (MD5) Previous issue date: 2017-01-19 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / O objetivo deste estudo foi avaliar a efetividade de diferentes modos de foto ativação das resinas compostas bulk fill comparando com as resinas convencionais, analisando sua influência na irradiância, no grau de conversão, assim como na formação de fendas internas e marginais em restaurações classe II tipo slot vertical, após envelhecimento artificial. Cento e sessenta incisivos bovinos foram cortados e desgastados para simular dentes posteriores, nos quais foram realizados preparos classe II. Os espécimes foram divididos em quatro grupos de acordo com o material restaurador utilizado: Tetric N-Ceram Bulk Fill (TB), Admira Fusion X-tra Bulk fill (AB), Tetric N-Ceram (TC) e GrandioSO (GO). As resinas bulk fill foram inseridas em incremento único de 4 mm e nos demais grupos foi utilizada a técnica incremental oblíqua (2 mm). A foto ativação foi realizada com os aparelhos do tipo Monowave (MW) ou Polywave (PW) nos dois modos (alta intensidade continua e rampa). A medição da irradiância foi feita utilizando espectroradiômetro Patient Simulator (MARC-PS). O grau de conversão foi avaliado através da reflectância total atenuada (ATR) do espectrômetro (FTIR). As superfícies superiores das amostras foram irradiadas in loco durante 20 s. O espectro da superfície inferior foi registrado em tempo real e após 15 min da irradiação. As fendas foram avaliadas em estereomicroscópio (50x). As fendas marginais externas foram avaliadas antes e após a ciclagem termomecânica. Para fenda interna, os espécimes foram seccionados e então avaliados. Os dados foram submetidos à ANOVA umo e dois fatores e teste Tukey. Em relação á irradiância o aparelho LED Monowave apresentou maior valor de irradiância (1822,2 mW/cm2 - AIC; 1748,1 mW/cm2 - R); na análise do GC, o teste ANOVA dois fatores mostrou diferença significativa (p<0,05) para o fator tipo de resina. A resina TB apresentou o menor grau de conversão, e AB o maior GC. Para fenda marginal foi encontrada diferença significativa para o fator fotopolimerização e interação resina x fotopolimerização (p<0,05). Resina TC fotopolimerizada PW/AIC apresentou maior média de fenda marginal (13,94 µm) e TC fotopolimerizada MW/AIC a menor (9,59 µm). Após o envelhecimento termomecânico a resina GO fotopolimerizada PW/R apresentou maior porcentagem de aumento de fenda marginal (48,54%) e maior fenda interna quando fotopolimerizada MW/AIC (85,05 µm). Concluiu-se que o tipo fotopolimerização não influenciou no grau de conversão. As restaurações polimerizadas com o fotopolimerizador Polywave apresentaram os maiores valores de fenda marginal externa. As resinas bulk fill apresentaram menores valores de fenda marginal e interna após o envelhecimento termomecânico quando comparadas com restaurações de resinas convencionais. / The objective of this study was to evaluate the influence of different photo activation modes on irradiance, the degree of conversion and formation of internal and external gaps in class II restorations using bulk fill resins. One hundred and sixty bovine incisors were cut and worn to simulate posterior teeth, in which class II preparations were performed. The specimens were divided into four groups according to the restorative material used: Tetric N-Ceram Bulk Fill (TB), Admira fusion X-tra Bulk fill (AB), Tetric N-Ceram (TC), GrandioSO (GO). The bulk fill resins were inserted in a single increment of 4 mm, and in the other groups, the incremental oblique technique was used. The photo activation was performed with a Monowave (MW) or Polywave (PW) light curing devices selecting two modes (high continuous intensity (HCI) and soft start (SS)). The irradiance measurement was performed using Patient Simulator (MARC-PS) in HCI and SS modes, for 20 s. For the degree of conversion, 2 mm and 4 mm high and 5 mm diameter molds were prepared for resin insertion directly on the attenuated total reflectance (ATR) spectrometer (FTIR). The upper surfaces of the samples were irradiated in situ for 20 s with the light curing apparatus in the modes (HCI) and (SS), the lower surface spectra was recorded continuously in real time and then at 15 min after irradiation. For the evaluation of the external gap each specimen was evaluated twice, one before and one after the thermomechanical cycling. For internal gap, the specimens were sectioned and evaluated using the stereomicroscope using a 50x magnification. About the irradiance, the Monowave LED showed the highest irradiance values (1822,2 mW/cm2 - HCI; 1748,1 mW/cm2 - SS), in the DC analysis, the two way ANOVA test showed significant difference (p <0.05) for the resin type. TB showed the lowest DC, with a statistical difference for AB. For the marginal gap, a significant difference was found for the photopolymerization factor and resin x photopolymerization interaction (p <0.05). TC light cured by PW/HCI showed the highest average marginal gap (13.94 μm) and TC light cured by MW / HCI revealed the lowest (9.59 μm) marginal gap. After thermomechanical aging, GO light cured by PW / SS had a higher percentage of increasing marginal gap (48.54%) and the highest internal gap when light cured by MW / HCI (85.05 μm). It was concluded that the type of photopolymerization did not influence the degree of DC. The restorations light cured by PW device showed the highest external marginal gaps. Bulk fill resins exhibited lower marginal and internal gap values after thermomechanical aging when compared with conventional resin.

abstract: Nanowires (NWs) have attracted many interests due to their advance in synthesis and their unique structural, electrical and optical properties. NWs have been realized as promising candidates for future photonic platforms. In this work, erbium chloride silicate (ECS), CdS and CdSSe NWs growth by vapor-liquid-solid mechanism and their characterization were demonstrated. In the ECS NWs part, systematic experiments were performed to investigate the relation between growth temperature and NWs structure. Scanning electron microscopy, Raman spectroscopy, X-ray diffraction and photoluminescence characterization were used to study the NWs morphology, crystal quality and optical properties. At low growth temperature, there was strong Si Raman signal observed indicating ECS NWs have Si core. At high growth temperature, the excess Si signal was disappeared and the NWs showed better crystal quality and optical properties. The growth temperature is the key parameter that will induce the transition from Si/ECS core-shell NWs structure to solid ECS NWs. With the merits of high Er concentration and long PL lifetime, ECS NWs can serve as optical gain material with emission at 1.5 &mu;m for communications and amplifiers. In the CdS, CdSSe NWs part, the band gap engineering of CdSSe NWs with spatial composition tuning along single NWs were demonstrated. The first step of realizing CdSSe NWs was the controlled growth of CdS NWs. It showed that overall pressure would largely affect the lengths of the CdS NWs. NWs with longer length can be obtained at higher pressure. Then, based on CdS NWs growth and by adding CdSe step by step, composition graded CdSSe alloy NWs were successfully synthesized. The temperature control over the source vapor concentration plays the key role for the growth. / Dissertation/Thesis / M.S. Electrical Engineering 2012

The purpose of this project is to verify if the so called capacitance method is a sensitive enough method to measure micrometer distance changes in an electrode system. This is done by heating up an electrode system to 60°C and make capacitance measurements during the procedure. With the inverse relationship between the capacitance and the distance between the surfaces the distance is attained. The incitement to find a sensitive measurement method is that in a particle accelerator the temperature is down to 4K and the components of an electrode system will contract which can lead to a breakdown of the system. The change in temperature gives a theoretical change in "gap distance" that is close to the measured change in gap distance, therefore the method is a reliable enough method to measure micrometer distance changes. A possible reason for the small deviation is that the measured temperature is the temperature of the surface of the electrode system. It would be preferable to measure the total temperature of the electrodes, not just the surfaces because it is the whole electrode that expands and contracts with the temperature. This could be done with an IR-camera.

To serve well as luminescent labels in biological applications, complexes of the lanthanide ions need to fulfil many criteria, including the requirement of high quantum yields, stability towards dissociation in biological media and preferably, excitation at wavelengths over 350 nm. Herein, a number of aspects regarding the sensitization of europium(III) and terbium(III) ions are discussed with respect to the design and development of novel complexes. The effect of the addition of anions such as fluoride and phosphate to the Eu(III) and Tb(III) complexes of a known tris(bipyridyl) cryptate, are studied with a view to gaining a better understanding of non-radiative deactivation pathways of the lanthanide excited state. Enhancements of Eu3+ emission within the cryptate are noted whilst with the Tb3+ analogue, emission is significantly reduced upon displacement of OH by these ions. A new ligand based on a polyaminocarboxylate structure with a single bipyridyl chromophore is then reported, which displays nine-coordination around the enclosed lanthanide ion. The luminescence properties of the europium complex are very good but the terbium complex shows more complex behaviour, suggestive of a back energy transfer mechanism from the terbium excited state to the ligand triplet level. The development of ligands with mixed N,O pyrido-phenol chromophoric groups, which are expected to be better sensitizers of terbium(III) luminescence, is also outlined. Finally, in the quest to sensitize europium using longer wavelengths, acridone is incorporated into an azamacrocyclic structure and luminescence is observed from the complexed Eu3+. The quantum yield of luminescence is found to increase with decreasing distance between the sensitizer and the ion, and in the presence of coordinating donor atoms.

Orientador: José Humberto Dias da Silva / Banca: Mario Antonio Bica de Moraes / Banca: Jose Roberto Ribeiro Bortoleto / Programa de Pós Graduação em Ciência e Tecnologia de Materiais, PosMat, tem carater institucional e integra as atividades de pequisa em materiais de diversos campi / Resumo: Semicondutores de gap largo são materiais de grande interesse devido às suas amplas aplicações tecnológicas. Entre os semicondutores de gap largo se destaca o GaN que apresenta características desejáveis para tais aplicações, como valor de energia de bandgap de 3,4 eV, alta condutividade térmica e alta dureza. As técnicas convencionais para a produção de filmes finos de GaN são a epitaxia por feixe molecular (MBE) e deposição de vapor químico de precursores metalorgânicos (MOVPE), porém tais técnicas possuem um elevado custo. Este trabalho discorre sobre a preparação e caracterização de filmes policristalinos de GaN pela técnica alternativa de RF magnetron sputtering reativo com diferentes temperaturas e tipos de substratos. Analisou-se o efeito da variação destes dois parâmetros sobre estrutura e propriedades ópticas destes filmes. Utilizou-se medidas de difração de raios-X, microscopia de força atômica, transmitância no ultravioleta/visível/infravermelho e espectroscopia de espalhamento Rutherford (RBS). As medidas realizadas reportaram que tanto a temperatura quanto o tipo de substrato influenciaram na textura de orientação, morfologia e propriedades ópticas dos filmes. Medidas de transmitância no infravermelho indicaram a presença de bandas relacionadas à contaminação com higrogênio e oxigênio em filmes depositados em temperaturas de substratos menores que 500ºC. As referidas contaminações são compatíveis com a análise residual da água detectada no sistema de deposições, e não foram observadas em temperaturas maiores de substrato. Os diafratogramas de raios-X revelaram que somente em temperaturas altas (Ts>500ºC) a textura de orientação dos filmes é influenciada pelo substrato utilizado, podendo apresentar indícios de crescimento epitaxial. As medidas... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: Wide bandgap semiconductor materials are of great interest due to the broad range of their technological applications. Among the wide bandgap semiconductor GaN stands out due to its desirable characteristics for such aplications as the value of energy bandgap of 3.4 eV, high thermal conductivity and high hardness. Conventional techniques for producing GaN thin films are the molecular beam epitaxy (MBE) and chemical vapor deposition of metalorganinc precursors (MOVPE), nevertheless these are high techniques. This work brings into focus the preparation and characterization of polycrystalline GaN films by the alternative technique of reactive RF magnetron sputtering with different temperatures and substrates. The effects of varying theses two parameters on structured and optical properties of these films were analysed. Therefore, X-ray diffraction, atomic force microscopy, optical transmittance in the ultraviolet/visible/infrared, and Rutherford Backscattering Spectrometry (RBS) were used to characterize the samples. The results show that temperature, substrate type, and substrate orientation influence the texture, morphology and optical properties of the films. The X-ray diffraction patterns revealed that the orientation texture of films is influenced by the substrate used only at high substrate temperature (Ts>500ºC). This evidences a tendency of epitaxial growth. Besides, the atomic force microscopy at temperature above 500ºC showed that the surface morphology is different for amorphous and crystalline substrates. It also became evident that the decrease of deposition rate and bandgap of the films with increasing deposition temperature is possibly due to nitrogen deficiency by the high rate of desorption at these temperatures. In addition, measurements of trasmisttanc in the infrared Fourier Transform indicated the presence... (Complete abstract click electronic access below) / Mestre