478 resultados para Liége


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La ville de Liège, à la fin du Moyen Âge, fut le théâtre de l’affirmation de ses bourgeois par l’entremise des corporations de métier et des institutions communales. Le XIVe siècle fut en effet marqué par des gains communaux importants au détriment, d’une part, du patriciat urbain, d’autre part, du prince-évêque de Liège. À partir de 1384, le Conseil liégeois, entièrement entre les mains des artisans, possédait des prérogatives étendues dans l’administration et la gestion de la ville. Toutefois, la progression du pouvoir bourgeois se trouva brusquement stoppée, pour une dizaine d’années, lors de la défaite liégeoise d’Othée, en 1408. Ce mémoire porte sur l’évolution du pouvoir communal liégeois dans la première moitié du XVe siècle, moins bien connue des historiens. L’étude de la chronique de Jean de Stavelot permet de mettre en lumière cette période trouble. La défaite d’Othée de même que les réformes imposées par les princes-évêques causèrent notamment de grands bouleversements. Des partis politiques entrèrent aussi en scène et la présence voisine du puissant duc de Bourgogne influença la vie des Liégeois. Ces particularités issues du contexte politique et social sont autant d’éléments qui influèrent sur la volonté d’affirmation des bourgeois et l’exercice du pouvoir communal à Liège.

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Signatur des Originals: S 36/F04237

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Signatur des Originals: S 36/F04238

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Signatur des Originals: S 36/F04239

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Signatur des Originals: S 36/F04243

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Signatur des Originals: S 36/F04244

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Signatur des Originals: S 36/F04245

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Signatur des Originals: S 36/F04246

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Signatur des Originals: S 36/F04247

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Signatur des Originals: S 36/F04248

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Signatur des Originals: S 36/F04249

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Three ice type regimes at Ice Station Belgica (ISB), during the 2007 International Polar Year SIMBA (Sea Ice Mass Balance in Antarctica) expedition, were characterized and assessed for elevation, snow depth, ice freeboard and thickness. Analyses of the probability distribution functions showed great potential for satellite-based altimetry for estimating ice thickness. In question is the required altimeter sampling density for reasonably accurate estimation of snow surface elevation given inherent spatial averaging. This study assesses an effort to determine the number of laser altimeter 'hits' of the ISB floe, as a representative Antarctic floe of mixed first- and multi-year ice types, for the purpose of statistically recreating the in situ-determined ice-thickness and snow depth distribution based on the fractional coverage of each ice type. Estimates of the fractional coverage and spatial distribution of the ice types, referred to as ice 'towns', for the 5 km**2 floe were assessed by in situ mapping and photo-visual documentation. Simulated ICESat altimeter tracks, with spot size ~70 m and spacing ~170 m, sampled the floe's towns, generating a buoyancy-derived ice thickness distribution. 115 altimeter hits were required to statistically recreate the regional thickness mean and distribution for a three-town assemblage of mixed first- and multi-year ice, and 85 hits for a two-town assemblage of first-year ice only: equivalent to 19.5 and 14.5 km respectively of continuous altimeter track over a floe region of similar structure. Results have significant implications toward model development of sea-ice sampling performance of the ICESat laser altimeter record as well as maximizing sampling characteristics of satellite/airborne laser and radar altimetry missions for sea-ice thickness.