978 resultados para 113-692
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Pós-graduação em História - FCLAS
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Vorbesitzer: Abraham Merzbacher
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Vorbesitzer: Brun von Brunfels; Brune-Kütze-Legat; Bartholomaeusstift Frankfurt am Main
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The stratospheric degradation of chlorofluorocarbons (CFCs) releases chlorine, which is a major contributor to the destruction of stratospheric ozone (O3). A recent study reported strong chlorine isotope fractionation during the breakdown of the most abundant CFC (CFC-12, CCl2F2, Laube et al., 2010a), similar to effects seen in nitrous oxide (N2O). Using air archives to obtain a long-term record of chlorine isotope ratios in CFCs could help to identify and quantify their sources and sinks. We analyse the three most abundant CFCs and show that CFC-11 (CCl3F) and CFC-113 (CClF2CCl2F) exhibit significant stratospheric chlorine isotope fractionation, in common with CFC-12. The apparent isotope fractionation (ϵapp) for mid- and high-latitude stratospheric samples are respectively −2.4 (0.5) and −2.3 (0.4) ‰ for CFC-11, −12.2 (1.6) and −6.8 (0.8) ‰ for CFC-12 and −3.5 (1.5) and −3.3 (1.2) ‰ for CFC-113, where the number in parentheses is the numerical value of the standard uncertainty expressed in per mil. Assuming a constant isotope composition of emissions, we calculate the expected trends in the tropospheric isotope signature of these gases based on their stratospheric 37Cl enrichment and stratosphere–troposphere exchange. We compare these projections to the long-term δ (37Cl) trends of all three CFCs, measured on background tropospheric samples from the Cape Grim air archive (Tasmania, 1978–2010) and tropospheric firn air samples from Greenland (North Greenland Eemian Ice Drilling (NEEM) site) and Antarctica (Fletcher Promontory site). From 1970 to the present day, projected trends agree with tropospheric measurements, suggesting that within analytical uncertainties, a constant average emission isotope delta (δ) is a compatible scenario. The measurement uncertainty is too high to determine whether the average emission isotope δ has been affected by changes in CFC manufacturing processes or not. Our study increases the suite of trace gases amenable to direct isotope ratio measurements in small air volumes (approximately 200 mL), using a single-detector gas chromatography–mass spectrometry (GC–MS) system.
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Die Foliierung geht nur bis Bl. 324; zusätzlich gibt es das Blatt 82a.
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abgedruckt in: Schopenhauer-Jahrbuch 56 (1975), S 170-171
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Text in französischer Sprache;
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Vorbesitzer: Werner Monch; Dominikanerkloster Frankfurt am Main
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Friedrich Stoltze II: Nachlaß, Grab
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Vorbesitzer: Karmeliterkloster Frankfurt am Main;
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Vorbesitzer: Oswaldus, Pleban in Ostheim (Vorbesitzer?), Karmeliterkloster Frankfurt am Main
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Max Horkheimer (?): "Why Research on Antisemitism?" (12.11.1943), a) Typoskript, 8 Blatt, b) Typoskript mit eigenhändigen Korrekturen und handschriftlichen Ergänzungen, 7 Blatt, c) Teilstück, Typoskript, 1 Blatt; Isaque Graeber: "Modern Antisemitism in Western Society. A Comperative Study of 'Critical Situations'" (1943), Typoskript mit eigenhändigen Korrekturen, 118 Blatt; Institute of Social Research: "Report on Isaque Graebers Study on Modern Antisemitism in Western Society. A Comperative Study of 'Critical Situations'" (24.11.1943), Typoskript, 73 Blatt; Institute of Social Research: "The Project of Political Antisemitism" (30.11.1943) a) Typoskript mit handschriftlichen Ergänzungen, 29 Blatt, b) Kurzfassung, Typoskript, 6 Blatt; "Memorandum to John Doe. Subject: Research Project on Antisemitism" (30.11.1943), Typoskript mit handschriftlichen Ergänzungen, 2 Blatt; Institute of Social Research: "Project on Antisemitism. Studies Completed or in Preparation" (Dezember 1943), Entwurf, Typoskript, 2 Blatt;
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"The Economic and Social Consequences of Preparedness Economics" (1937-1939):; 1. "First Draft of a Memorandum on a Research Project on The Economic Consequences of Preparedness Economics, planned by the International Instittute of Social Research" (13.12.1938). Typoskript mit handschriftlichen Ergänzungen, 2 Blatt; 2. Albert Lauterbach: "Project submitted to the Social Science Research Council: Sociological and Economic Aspects of Preparedness Economics". Typoskript, 3 Blatt; 3. Günther Reimann: "The Economics of Chemical Production". Typoskript, 4 Blatt; 4. Franz Neumann: "Bemerkungen zum Exposé Dr. Heiders 'Die Rolle der Bürokratie im totalitären Staat'" (22.2.1937). Typoskript, 1 Blatt; 5. Joseph Soudek: "Soziale und wirtschaftliche Aspekte der Wehrwirtschaft". Typoskript mit handschriftlichen Korrekturen und Ergänzungen von Friedrich Pollock (16.1.1939), 5 Blatt; 6. "Recovery and Boom Politics", Gliederungsentwurf, 3 Blatt; 7. "Interventionism and Business Cycles", Gliederungsentwurf, 7 Blatt;