997 resultados para 145-887B


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u.a.: Kritik an den Philosophieprofessor Trendelenburg; Philosophische Ausbildung durch Jean Paul, Friedrich Schleiermacher und Arthur Schopenhauer; Seneca; Dr. Friedrich Ernst Suchsland;

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Drucksachen und Schriftwechsel der UNESCO (Paris, Hamburg, Gauting), 1957-1965; 69 Briefe zwischen Dr. Gilda Mara, UNESCO und Max Horkheimer, 1959-1965; 12 Briefe zwischen Dr. Helga Timm, UNESCO und Max Horkheimer, 1957-1958;

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Briefwechsel zwischen Theodor W. Adorno, Gretel Adorno und Max Horkheimer, 1949-1954; Briefwechsel zwischen Alice Maier uind Max Horkheimer; Briefwechsel zwischen dem Hessischen Minister für Erziehung und Volksbildung und Theodor W. Adorno sowie Max Horkheimer; 1 Brief zwischen Alice Maier und Leo Löwenthal; 1 Brief zwischen Melvin J. Lasky und Theodor W. Adorno, 14.01.1950;

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Maria Stoltze: Gesuch an den Großherzog wegen Stoltzes Pressprozess

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componirt von Ferdinand Hiller

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Trägerbände: Inc. qu. 664; Inc. oct. 212; Inc. oct. 321; Inc. oct. 366; Inc. oct. 429; Vorbesitzer: Dominikanerkloster Frankfurt am Main

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Excerpts of Radio Talks by G. Allison Phelps, Radio Station KMTR; Institute of Social Research: An American Disciple of Adolf Hitler. A Study of the Nazi Propaganda Methods Used by Joseph E. McWilliams of the American Destiny Party in 1940 Election Campaign;

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Atmospheric carbon dioxide concentrations were significantly lower during glacial periods than during intervening interglacial periods, but the mechanisms responsible for this difference remain uncertain. Many recent explanations call on greater carbon storage in a poorly ventilated deep ocean during glacial periods (Trancois et al., 1997, doi:10.1038/40073; Toggweiler, 1999, doi:10.1029/1999PA900033; Stephens and Keeling, 2000, doi:10.1038/35004556; Marchitto et al., 2007, doi:10.1126/science.1138679; Sigman and Boyle, 2000, doi:10.1038/35038000), but direct evidence regarding the ventilation and respired carbon content of the glacial deep ocean is sparse and often equivocal (Broecker et al., 2004, doi:10.1126/science.1102293). Here we present sedimentary geochemical records from sites spanning the deep subarctic Pacific that -together with previously published results (Keigwin, 1998, doi:10.1029/98PA00874)- show that a poorly ventilated water mass containing a high concentration of respired carbon dioxide occupied the North Pacific abyss during the Last Glacial Maximum. Despite an inferred increase in deep Southern Ocean ventilation during the first step of the deglaciation (18,000-15,000 years ago) (Marchitto et al., 2007, doi:10.1126/science.1138679; Monnin et al., 2001, doi:10.1126/science.291.5501.112), we find no evidence for improved ventilation in the abyssal subarctic Pacific until a rapid transition ~14,600 years ago: this change was accompanied by an acceleration of export production from the surface waters above but only a small increase in atmospheric carbon dioxide concentration (Monnin et al., 2001, doi:10.1126/science.291.5501.112). We speculate that these changes were mechanistically linked to a roughly coeval increase in deep water formation in the North Atlantic (Robinson et al., 2005, doi:10.1126/science.1114832; Skinner nd Shackleton, 2004, doi:10.1029/2003PA000983; McManus et al., 2004, doi:10.1038/nature02494), which flushed respired carbon dioxide from northern abyssal waters, but also increased the supply of nutrients to the upper ocean, leading to greater carbon dioxide sequestration at mid-depths and stalling the rise of atmospheric carbon dioxide concentrations. Our findings are qualitatively consistent with hypotheses invoking a deglacial flushing of respired carbon dioxide from an isolated, deep ocean reservoir periods (Trancois et al., 1997, doi:10.1038/40073; Toggweiler, 1999, doi:10.1029/1999PA900033; Stephens and Keeling, 2000, doi:10.1038/35004556; Marchitto et al., 2007, doi:10.1126/science.1138679; Sigman and Boyle, 2000, doi:10.1038/35038000; Boyle, 1988, doi:10.1038/331055a0), but suggest that the reservoir may have been released in stages, as vigorous deep water ventilation switched between North Atlantic and Southern Ocean source regions.

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Fil: Juárez, Laura Susana. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

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