Le travail de recherche qui est rapporté dans ce manuscrit porte sur les couches minces de pérovskites et leur utilisation dans le cadre de la problématique des microcavités en régime de couplage fort. L'arrangement cristallin des pérovskites forme une structure en multi-puits quantiques dans laquelle les états excitoniques présentent une grande force d'oscillateur et une énergie de liaison importante (quelques 100 meV), en raison des effets de confinements quantique et diélectrique. Un premier axe de ce travail a consisté à collecter des informations sur les propriétés excitoniques de ces matériaux. Sur une pérovskite particulière (PEPI), nous avons notamment effectué des mesures de photoluminescence sous excitation impulsionnelle et des mesures pompe-sonde qui semblent suggérer l'existence, sous forte densité d'excitation, d'un processus de recombinaison Auger des excitons. Un deuxième axe de recherche fut de mettre en cavité des couches de certaines pérovskites. Avec les pérovskites PEPI et PEPC, nous avons montré que la réalisation de microcavités présentant un facteur de qualité de l'ordre de la dizaine suffit à obtenir, à température ambiante, le régime de couplage fort en absorption et en émission avec des dédoublements de Rabi pouvant atteindre 220 meV. Un goulet d'étranglement dans la relaxation des polaritons a été clairement mis en évidence pour la microcavité PEPI. Nous avons d'autre part montré que les pérovskites pouvaient également être associées à des semi-conducteurs inorganiques dans des microcavités dites "hybrides". Selon Agranovich et al., ces dernières pourraient, dans le cadre de la problématique du laser à polaritons, constituer une alternative à l'augmentation du facteur de qualité des microcavités. Dans cette optique, le couple ZnO/MFMPB semble particulièrement prometteur.

Dans ce travail de thèse, nous étudions les propriétés de transport électronique des nanorubans de graphène sous champs magnétiques intenses (jusqu'à 55 T) pour révéler les effets de confinements électroniques dans la structure de bande de graphène.

This thesis explores the theoretical, psychological, and phenomenological notions of the singular personal memory and the collective memory through civic architecture. The main design guidelines are inspired by the ancient teachings on the mnemonics of rhetoric and the phenomenology of the imagination. This thesis uses architecture and space as a medium to be an interpretative tool of narrating the sequential event of the Halifax Explosion of 1917. Architecture as an art form can deliberately be created to mimic, represent, and express key moments of an event, which when experienced individually through the duality between body, memory, and light, the personal memory becomes the primary mode of story-telling. The civic collective memory is always changing dependent on time and intentional involvement. These processes are recorded through theoretical texts, drawings, and physical models that serve as interpretive tools for the haptic dialectics of memory, imagination, phenomenology, and the play on atmospheric emotions.

Seeking to widen the existing literature on postcolonial cities, this thesis conducts an inquiry into the multilocality of postcolonial space. Through ethnographic research in Sri Lanka’s Galle Fort, it investigates how different social groups differently use and interpret the city’s former colonial built environment. Specifically, it examines how the postcolonial city is socially produced and constructed as a place of home for local communities, a World Heritage Site, and a gentrifying neighborhood. Using interviews, observations, and spatial analyses, it teases out the local, national, and transnational socio-economic forces that drive these processes, as well as the power-dynamics and resistances that come into play. It finds that postcolonial uses of space often relate to, and sometimes recall, social struggles that characterized urban space under colonialism. Drawing on these findings, it highlights the importance of studying social relations, heritage management, and gentrification in postcolonial cities in conversation with literatures on colonial urbanisms.

The Fort Albany First Nation (FAFN) in Ontario’s western James Bay region is interested in undertaking a community-based process of land use planning for its traditional territory, in order to respond to increasing resource development pressure within the area. To construct a framework for such a process, semi-structured interviews were held with 12 members of the FAFN and two staff members of the Mushkegowuk Council, which represents the FAFN at the regional level. Interviews focused on the substantive values that community members see as worthy of protection or management through the land use plan, and on the procedural values that ought to guide the process. In addition, three group discussions on valued ecosystem components were observed, to supplement interview data on substantive values. The results indicate that the community is concerned with preserving their way of life in the face of resource development pressure and social change, by protecting subsistence resources and strengthening the transmission of culture. Substantively, this means that the land use plan needs to protect wildlife and its habitat, navigable waterways, and water quality. Procedurally, this means that the planning process should engage the entire community in discussions of its cultural identity and connection to the land, in order to build a genuine consensus on appropriate land uses. It was felt that the process should be grassroots-based, that the FAFN should initiate the process autonomously, and that the planning process should pursue the twin goals of community self-determination and cultural continuity. It was also felt that neighbouring first nations should be invited to participate in the process or to conduct separate planning activities streamlined with those of the FAFN, because of overlap in traditional territories. At the conclusion of this thesis, a set of recommendations outlines a planning process that is appropriate to the needs and values expressed by participants. This framework draws upon the principles of empowerment, advocacy, and collaborative planning, applying them to the local cultural context. It relies upon social learning as a vehicle by which to develop a community-wide vision for the traditional territory of the FAFN. / Thesis (Master, Urban & Regional Planning) -- Queen's University, 2008-09-23 19:11:37.053

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No description available.

On June 1, 1866, one thousand heavily-armed Irish-American Fenian insurgents invaded Upper Canada across the Niagara River from Buffalo, NY. The next day near the town of Ridgeway, 800 Fenians battled with 850 Canadian volunteer soldiers, including a small company of 28 University of Toronto students who ended up taking the brunt of the attack. The Battle of Ridgeway (or Lime Ridge or Limestone Ridge) ended with a disastrous rout of the Canadians who in their panicked retreat left their dead and wounded on the field. It was the last major incursion into Canada, the last battle in Ontario and the first modern one fought by Canadians, led in the field exclusively by Canadian officers, and significantly fought in Canada. The Fenian Raid mobilized some 22,000 volunteer troops and resulted in the suspension of habeas corpus in the colonial Province of Canada by its Attorney General and Minister of Militia John A. Macdonald, but the battle which climaxed this crisis is only prominent by its obscurity in Canadian historiography. Almost everything known and cited about Ridgeway springs from the same sources—four books and pamphlets—three of them published in the summer of 1866 immediately after the event and the remaining one in 1910. This dissertation argues that the history of the battle was distorted and falsified by these sources and by two military board of inquiries staged to explicitly cover up the extent of the disaster. This study investigates the relationship between the inquiries and the contemporary author-historians of two of the sources: Alexander Somerville, an investigative journalist in Hamilton, Ontario, a recent immigrant from Britain with a controversial history; and George T. Denison III, a prominent young Toronto attorney, a commander of a troop of volunteer cavalry, a former Confederate secret service agent, author-commentator on Canada’s military policy and presiding judge on both boards of inquiry. This study describes the process by which Ridgeway’s history was hidden and falsified and its possible scope and significance in Canadian historiography. New archival and published sources are identified, assessed and assembled for a newly restored and authenticated micro-narrative of the battle.

On June 1, 1866, one thousand heavily-armed Irish-American Fenian insurgents invaded Upper Canada across the Niagara River from Buffalo, NY. The next day near the town of Ridgeway, 800 Fenians battled with 850 Canadian volunteer soldiers, including a small company of 28 University of Toronto students who ended up taking the brunt of the attack. The Battle of Ridgeway (or Lime Ridge or Limestone Ridge) ended with a disastrous rout of the Canadians who in their panicked retreat left their dead and wounded on the field. It was the last major incursion into Canada, the last battle in Ontario and the first modern one fought by Canadians, led in the field exclusively by Canadian officers, and significantly fought in Canada. The Fenian Raid mobilized some 22,000 volunteer troops and resulted in the suspension of habeas corpus in the colonial Province of Canada by its Attorney General and Minister of Militia John A. Macdonald, but the battle which climaxed this crisis is only prominent by its obscurity in Canadian historiography. Almost everything known and cited about Ridgeway springs from the same sources—four books and pamphlets—three of them published in the summer of 1866 immediately after the event and the remaining one in 1910. This dissertation argues that the history of the battle was distorted and falsified by these sources and by two military board of inquiries staged to explicitly cover up the extent of the disaster. This study investigates the relationship between the inquiries and the contemporary author-historians of two of the sources: Alexander Somerville, an investigative journalist in Hamilton, Ontario, a recent immigrant from Britain with a controversial history; and George T. Denison III, a prominent young Toronto attorney, a commander of a troop of volunteer cavalry, a former Confederate secret service agent, author-commentator on Canada’s military policy and presiding judge on both boards of inquiry. This study describes the process by which Ridgeway’s history was hidden and falsified and its possible scope and significance in Canadian historiography. New archival and published sources are identified, assessed and assembled for a newly restored and authenticated micro-narrative of the battle.

Ce mémoire de thèse s'intéresse au comportement du béton sous chargement triaxial sévère. L'étude est réalisée dans le contexte plus général de la compréhension du comportement du béton sous impact, ce qui induit des états de contraintes triaxiales de très haute intensité. Afin de reproduire des niveaux de contraintes très élevés avec des chemins de chargement bien contrôlés, des essais triaxiaux statiques sont réalisés sur des échantillons de béton au moyen d'une presse triaxiale de très grande capacité. Nous nous sommes intéressés à l'influence des granulats, qui occupent environ 40% du volume du béton. Plus précisément, les effets de la forme et de la composition chimique des granulats sont étudiés pour des compression triaxiale entre 0 et 650 MPa de confinement . On considère à la fois la réponse macroscopique et les modes de rupture. La forme des granulats semble peu influencer le comportement du béton, alors que les effets de leur composition sont assez importants, quelque soit le confinement. La deuxième partie de la thèse est consacrée à une modélisation numérique du béton. L'objectif principal de ce travail numérique est de développer un modèle très simple en termes de lois d'interaction et d'introduire l'hétérogénéité du béton au niveau mésoscopique. Un modèle mésoscopique du béton est ainsi établi dans le cadre des éléments discrets. On étudie l'influence des propriétés des granulats et de l'interface graulats/mortier sur les courbes contrainte-déformation et les mécanismes d'endommagement. D'autre part, l'influence des vides est étudiée en utilisant des échantillons mono-phasiques avec différentes caractéristiques des vides. Un comportement complexe non linéaire, résultant de la présence, des vides est observé. Par ailleurs, les résultats numériques complètent, et permettent de mieux comprendre, les résultats expérimentaux.