983 resultados para St. Lawrence Estuary
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This layer is a georeferenced raster image of the historic paper map entitled: St. Lawrence Bay showing Lutke's Harbor, by the U.S. Ship Vincennes, Lieutenant John Rodgers ; produced by E.R. Knorr, draughtsman ; sketches by Wm. Brenton Boggs, purser U.S.N. ; engr. by Selmar Siebert ; reduced for engraving by Louis Waldecker. It was published by U.S. Navy Hydrographic Office in 1855. Scale [ca. 1:200,000]. Covers Zaliv Lavrentiya, Russia. The image inside the map neatline is georeferenced to the surface of the earth and fit to the 'Mercator' projection. All map collar and inset information is also available as part of the raster image, including any inset maps, profiles, statistical tables, directories, text, illustrations, index maps, legends, or other information associated with the principal map. This map shows features such as drainage, human settlements, shoreline features, bays, harbors, inlets, points, shoals, anchorage points and bottom types, and more. Relief shown by contours and spot heights. Depths shown by soundings. Includes note on Lutke's Harbor and 2 inset profile views. This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection and the Harvard University Library as part of the Open Collections Program at Harvard University project: Organizing Our World: Sponsored Exploration and Scientific Discovery in the Modern Age. Maps selected for the project correspond to various expeditions and represent a range of regions, originators, ground condition dates, scales, and purposes.
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Le projet de recherche-création proposé survole la québécité à travers un pan majeur de l’étude des Amériques : le territoire. L’adoption du territoire québécois, de son espace, et de sa densité – effectué à la fois sous un axe méridional (le Saint-Laurent) et septentrional (le Nord) –, s’effectue dans mon corpus acousmatique à travers l’utilisation de concepts théoriques établis par plusieurs figures québécoises et internationales. La description des sources d'inspiration du cycle d’œuvres acousmatique proposé, étant principalement issues de sphères extramusicales — la démarche de divers artistes et chercheurs québécois ayant contribué à l’émergence poétique de mon corpus tels que Pierre Perrault, René Derouin, Daniel Chartier, et Louis-Edmond Hamelin — y tient une place importante. La portion musicale est effectuée de façon analytique à l’aide de deux méthodes propres au genre électroacoustique – analyse typologique de Pierre Schaeffer, et fonctionnelle de Stéphane Roy –, qui, à travers l’œuvre de certains compositeurs de musiques électroniques internationaux permettent de souligner la pluralité des conceptions territoriales et le réseau sémantique universel sous-jacent, laissant place à une lecture plus large de cette thématique. La méthodologie proposée permet donc à la fois de cerner l’universel – modèles naturels, références psychoacoustiques –, le local – utilisation de poèmes québécois, référents animaux ou anecdotiques précis tels que des cris d’oiseaux et des prises sonores du Saint-Laurent –, et la relation dichotomique entre la nature et la culture dans mon corpus, afin qu’émerge un discours musical cohérent basé sur le territoire québécois.
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It has long been recognized that the transition from the last glacial to the present interglacial was punctuated by a brief and intense return to cold conditions. This extraordinary event, referred to by European palynologists as the Younger Dryas, was centered in the northern Atlantic basin. Evidence is accumulating that it may have been initiated and terminated by changes in the mode of operation of the northern Atlantic Ocean. Further, it appears that these mode changes may have been triggered by diversions of glacial meltwater between the Mississippi River and the St. Lawrence River drainage systems. We report here Accelerator Mass Spectrometry (AMS) radiocarbon results on two strategically located deep-sea cores. One provides a chronology for surface water temperatures in the northern Atlantic and the other for the meltwater discharge from the Mississippi River. Our objective in obtaining these results was to strengthen our ability to correlate the air temperature history for the northern Atlantic basin with the meltwater history for the Laurentian ice sheet.
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[From Jasper Cropsey Sketch book, 1855-1856]
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Mode of access: Internet.
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En tête du titre: Prize essay.
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"The tract upon which the study was made is owned and operated by F.A. cutting of Boston, Mass. It comprises 8,000 acres of the northeast quarter of Riversdale township in St. Lawrence county."--L. 1.
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Vol. 1 has added t.-p., engr.
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"January 1997."
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Caption title: Letter, &c. To the electors of St. Lawrence and Franklin Counties, New-York.
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Mode of access: Internet.
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The phylogenetic relationships and historical biogeography of 10 currently described rainforest skinks in the genus Saproscincus were investigated using mitochondrial protein-coding ND4 and ribosomal RNA 16S genes. A robust phylogeny is inferred using both maximum likelihood and Bayesian analysis, with all inter-specific nodes strongly supported when datasets are combined. The phylogeny supports the recognition of two major lineages (northern and southern), each of which comprises two divergent clades. Both northern and southern lineages have comparably divergent representatives in mid-east Queensland (MEQ), providing further molecular evidence for the importance of two major biogeographic breaks, the St. Lawrence gap and Burdekin gap separating MEQ from southern and northern counterparts respectively. Vicariance associated with the fragmentation and contraction of temperate rainforest during the mid-late Miocene epoch underpins the deep divergence between morphologically conservative lineages in at least three instances. In contrast, one species, Saproseincus oriarus, shows very low sequence divergence but distinct morphological and ecological differentiation from its allopatric sister clade within Saproseincus mustelinus. These results suggest that while vicariance has played a prominent role in diversification and historical biogeography of Saproscincus, divergent selection may also be important. (C) 2004 Elsevier Inc. All rights reserved.
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Essa dissertação se propôs a analisar o entendimento do conceito de juventude, ou melhor, juventudes, nos dias de hoje. Junto a essa busca, nos deparamos com o surgimento das polÃticas públicas voltadas para essa parte da sociedade, finalmente entendida como uma população complexa, plural, capaz e desejosa de ser protagonista da própria história. Num olhar mais cuidadoso, questionamos como se caracteriza a pluralidade da juventude da cidade de São Lourenço (MG). Uma polÃtica municipal para jovens pode atender tal pluralidade? A construção de uma polÃtica municipal para jovens é apropriada à pluralidade da juventude? Para esta pesquisa, entendemos que a metodologia de estudo de caso, com caráter exploratório, assim como a pesquisa autobiográfica seriam as mais adequadas para uma compreensão complexa e profunda dessa realidade. A base teórico-conceitual foi escolhida a partir dos estudos mais recentes relativos à juventude. Teóricos como Castro e Aquino estão bem presentes neste trabalho, assim como Sposito, Abramo, Pais e MarÃas, no primeiro capÃtulo. No segundo capÃtulo, além da consistente contribuição de Ninis e Giolito, recorreu-se a autores, documentos locais e publicações eletrônicas, bem como a própria vivência da autora na cidade. No terceiro capÃtulo, a trajetória pessoal da autora, seu trabalho como funcionária da Prefeitura Municipal e a dissertação de mestrado se encontram. Como mostrou Gilberto Velho, memória, projeto e identidade são significativos na vida pessoal e na possibilidade da transformação social.(AU)
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Continental margin sediments off Nova Scotia accumulate at high rates (up to 360 cm/kyr) and contain a history of millennial-scale environmental changes which are dominated by the proximity of the Laurentide ice sheet during the latest Quaternary. Using stable isotope ratios of oxygen, accelerator mass spectrometer radiocarbon dating, micropaleontology, and sedimentology, we document these changes in six piston cores ranging in water depth from ab. 450 to ab. 4300 m. We find that maximum d18O in N. pachyderma occurred about 15 ka and preceded the maximum abundance of this species in these cores by ab. 1000 years. Between 13 and 14 ka we find a second peak in abundance of N. pachyderma, minimum d18O, and two pulses of ice rafting. The sediment lithology supports terrestrial studies which indicate that there was a general withdrawal of ice beyond the upper Paleozoic and Mesozoic red beds by 14 ka in southeastern Canada, so the ice rafting events between 13 and 14 ka probably reflect ice stream activity in the St. Lawrence valley. The Younger Dryas event is recognized as a peak in abundance of N. pachyderma and ice rafting (dated as ab. 11.3 ka), but meltwater discharge to the Gulf of St. Lawrence was either too small or occurred over too long a time to leave a distinct d18O minimum off Nova Scotia. At 7.1 ka, in the middle of Holocene warming, we find a third peak in abundance of N. pachyderma and another d18O minimum but no ice rafting. We interpret these data as evidence of a late-occurring meltwater event which, if correct, could have originated in the Great Lakes, in the Labrador-Ungava region, or in both. The final millennial-scale phenomenon off Nova Scotia is the onset of "Neoglaciation," marked by increased ice rafting and increased % N. pachyderma beginning about 5 kyr ago.
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A compilation of basal dates of peatland initiation across the northern high latitudes, associated metadata including location, age, raw and calibrated radiocarbon ages, and associated references. Includes previously published datasets from sources below as well as 365 new data points.