Thesis (M. App. Sc.)--Carleton University, 2005. / Includes bibliographical references. Also available in electronic format on the Internet.

Tidal stream energy is a predictable source of renewable energy. Tidal stream turbines have been proposed as a way to extract useful energy from the tide. Many arrays of such devices will need to be installed to extract significant amounts of energy. The presence of an array of turbines within a tidal flow will impact the flowfield, as complex fluid interactions occur across multiple scales. This thesis is concerned with the behaviour of tidal turbines arrayed across channels. Experimental and analytical work is carried out to investigate array behaviour and to create new modelling tools to replicate this behaviour. Linear Momentum Actuator Disc Theory (LMADT) is employed to develop a new analytical model for a long row array of tidal turbines split into multiple smaller, co- linear row arrays. An argument of separation of scales is used to facilitate this model. It is found that increases in power extraction beyond that of a single continuous row array are possible. Experimental work is carried out on a row array of eight porous discs, simulating a short row array of tidal turbines. Disc porosity and spacing are varied to investigate thrust on the array, flow behaviour behind the array and an 'inferred' power removed from the flow. The results are compared to previously developed theoretical models. Good agreement is found with the trends of the analytical model, for example that there is a peak power coefficient which can be reached through appropriate selection of spacing and disc resistance. Differences from theory are found in the total thrust and power measurements, as well as in some aspects of the flow behaviour in the array wake. Reductions in thrust and power towards the ends of the array are also identified as 'end effects' which are not included in the analytical model. Based on these results a new semi-empirical model is proposed, using LMADT with experimental data closure. This model allows variation of the disc resistance across a row array. Values from the experimental work are used as inputs to the model, and the results compared to experimental measurements of flowspeed, thrust and power. Although agreement with experimental results is found in some areas, there are still some discrepancies between the analytical model and the experimental results. This indicates that there are additional factors that contribute to end effects on a short row array.

Thesis (Ph. D.)--University of Hong Kong, 2008. / Includes bibliographical references (leaf 127-140) Also available in print.

Thesis (Ph. D.)--University of Hong Kong, 2008. / Includes bibliographical references (leaf 127-140) Also available online.

Dans la quasi-totalité des nations du monde, l’éducation s’impose comme un droit fondamental de la personne. Les Etats africains, suite à leur accession à l’indépendance dans les années 60, ont également accordé une primauté absolue à l’éducation, parce que condition sine qua non de tout développement. De la Conférence d’Addis-Abeba en 1961 aux assises de Harare en 1982, en passant par les rencontres d’Abidjan en 1964 et Lagos en 1968, l’éducation a toujours été au cœur des préoccupations des Chefs d’Etats et de Gouvernements. Elle est consignée dans un ensemble d’instruments juridiques internationaux. Ces instruments relatifs au droit à l’éducation ont été internalisés dans le corpus juridique interne du Cameroun. Au Cameroun, l’expansion de l’école en général et celle et de l’enseignement de base en particulier, a connu un ralentissement remarquable avec la crise économique du milieu des années 80, entraînant un fort taux de déscolarisation, dont le plus élevé s’observe dans la Région de l’Extrême-Nord. Bien que le tout premier Président du Cameroun ait été issu de cette Région et qu’elle dispose de la population la plus importante à l’échelle nationale, il n’en a pas pour autant résulter, au profit de cette région, une action publique conséquente en matière d’investissement éducatif. L’application des instruments relatifs au droit à l’éducation garanti à ceux qui en sont bénéficiaires de pouvoir disposer de la pleine capacité de participer à la gestion des affaires publiques, de développer leur potentiel tout en contribuant au développement national. Sauf que, l’effectivité de ces instruments est loin d’être assurée au niveau local en raison de contraintes politiques, économiques, démographiques, géographiques, sociales et culturelles du système éducatif. Divers politiques publiques, dont celle liée à la décentralisation ont été adopté en vue d’accroître l’efficacité de l’action publique locale. Toute chose qui ne peut qu’impacter positivement sur la qualité de l’investissement éducatif. Politique de décentralisation tendant vers une « nouvelle gouvernance fondée sur les dynamiques locales » . Cette décentralisation est elle-même plombée par de nombreuses contradictions qui retarde ou diffère son effectivité dans le contexte camerounais. / In almost all nations of the world, education is required as a fundamental human right. African states, following their accession to independence in the 60s, were also granted an absolute primacy to education, because sine qua non of any development. Conference in Addis Ababa in 1961 the foundations of Harare in 1982, through the Abidjan meeting in 1964 and Lagos in 1968, education has always been at the heart of the concerns of Heads of State and Government . It is contained in a set of international legal instruments. These instruments relating to the right to education have been internalized into the domestic legal corpus of Cameroon. In Cameroon, the expansion of the school in general and and especially basic education, has been remarkably slow with the economic crisis of the mid-80s, resulting in a high dropout rate, the highest of is seen in the Far North Region. Although the first President of Cameroon was coming from this region and it has the largest population nationwide, it has none provided result, the benefit of this region, a public action consistent in terms of educational investment. The application of instruments relating to the right to education guaranteed to those who are recipients able to have the full capacity to participate in governance, to develop their potential and contribute to national development. Except that the effectiveness of these instruments is far from guaranteed at the local level due to political, economic, demographic, geographic, social and cultural education system. Various public policies, including those related to decentralization have been adopted to increase the efficiency of local public action. Anything that can qu'impacter positively on the quality of educational investment. Decentralization policy tending towards a "new governance based on local dynamics." This decentralization is itself weighed down by many contradictions or delaying its effectiveness differs in the Cameroonian context.

Diploma thesis The power imbalance in caring families deals with power dynamics in the caregiving situation, where mother is a care receiver and her own daughter is caregiver. The theoretical part conceptualizes terms such as the power, the power imbalance, role reversal, caregiver, care receiver and ambivalence. The practical part is presented with its own qualitative survey with caregivers. The work confirms that the factors that significantly affect the success of care are (by caring daughter) options for care giving and degree of caring tie, and (by care receiving mother) ability to give up part of their autonomy, to assess properly the subjective and objective assistance needs and satisfaction with quality and quantity of social ties. The work also reveals some of the mechanisms of power dynamics within families; for example, the ways in which the phase of role reversal is reflected in mutual negotiation, persuasion in dimension, feelings of interaction, advocacy and conflict resolution. It turned out that a higher intergenerational power has actor with incomplete role reversal. Phase of role reversal showed to be a key factor in sorting manifestations of power dynamics in caregiving families. The main outcome of this work is the typology of strategies for power influence of caregivers and...