1000 resultados para 120-747


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Rubr. Kapitelanfänge mit roten und blauen Init.; Vorbesitzer: Leonhardstift Frankfurt am Main

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We present successful 81 Kr-Kr radiometric dating of ancient polarice. Krypton was extracted from the air bubbles in four∼350-kg polar ice samples from Taylor Glacier in the McMurdo Dry Valleys, Antarctica, and dated using Atom Trap Trace Analysis (ATTA). The 81 Kr radiometric ages agree with independent age estimates obtained from stratigraphic dating techniques with a mean abso-lute age offset of 6±2.5 ka. Our experimental methods and sampling strategy are validated by (i) 85 Kr and 39 Ar analyses that show the samples to be free of modern air contamination and (ii)air content measurements that show the ice did not experience gas loss. We estimate the error in the 81 Kr ages due to past geomagnetic variability to be below 3 ka. We show that ice from the previous interglacial period (Marine Isotope Stage 5e, 130–115 ka before present) can be found in abundance near the surface of Taylor Glacier. Our study paves the way for reliable radiometric dating of ancient ice in blue ice areas and margin sites where large samples are available, greatly enhancing their scientific value as archives of old ice and meteorites. At present, ATTA 81Kr analysis requires a 40–80-kg ice sample; as sample requirements continue to decrease, 81 Kr dating of ice cores is a future possibility.

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Beermann

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Vorbesitzer: Johann Hieronymus Zum Jungen;

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Chr. Hoffmeister

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Vorbesitzer: Bartholomaeusstift Frankfurt am Main;

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u.a.: Heinrich August Carl Ganslandt;

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u.a.: Übergabe der Vollmacht an Hinrich Burghart Abegg in Vertragsangelegenheiten; Finanzen;

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Bitte um Entschuldigung, daß Stoltze versehentlich nicht zu einer Schulprüfung (mit Rezitation seiner Gedichte) eingeladen wurde

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von F. Wohltmann

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Vorbesitzer: Johann Hieronymus Zum Jungen

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Institute of Social Research: "Project on Antisemitism. Report to the American Jewish Committee on the first year of the Project ending March 15, 1944" (April 1944), a) Typoskript, 153 Blatt, b) Teilstück, Typoskript mit handschriftlichen Korrekturen, 22 Blatt, c) Entwurf der Gliederung, 16.11.1943, Typoskript, 2 Blatt, d) "Annex 1: List of Contributors to the Project on Antisemitism", Typoskript, 3 Blatt; "Notes on the latest phase of Nazi Antisemitism" (12.5.1944), a) Typoskript mit handschriftlichen Korrekturen und Ergänzungen, 4 Blatt, b) Typoskript, 3 Blatt;