1000 resultados para 168-1026C


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4 Briefe zwischen Walter Benjamin und Cecilia Razovsky; 6 Briefe zwischen Cecilia Razovsky und Max Horkheimer; 1 Brief von Cecilia Razovsky an den American Consul, 17.11.1939; 1 Brief von Antonio Sols an Max Horkheimer, 30.10.1940; 1 Brief von Max Horkheimer an Antonio Sols, 11.10.1940; 1 Brief (Abschrift, Auszug) an A. R. L. Gurland von Frau Gurland, 11.10.1940; 3 Briefe zwischen dem Emergency Rescue Committee (New York) und Max Horkheimer, August 1940; 1 Brief von Max Horkheimer an Pastor del Rio, 17.07.1940; 1 Brief von Max Horkheimer an J. Wavrinek, 17.07.1940; 1 Brief von Theodor W. Adorno an Gershom Scholem, 16.07.1940; 1 Brief von Max Horkheimer an Hans Schaudinger, 13.07.1940; 1 Brief von Max Horkheimer an George S. Messersmith, 08.07.1940; 1 Brief von Max Horkheimer an Adolph Kates, 05.07.1940; 1 Brief von Max Horkheimer an Adolph Kates, 29.06.1940; 2 Briefe zwischen dem Refugee Section of the American Friends Service Committee (Philadelphia) und Max Horkheimer, Mai 1940; 2 Briefe von Egon Wissing an Max Horkheimer, 1940; 1 Brief von Max Horkheimer an die Economy Blue Print Co. (New York), 25.05.1940; 1 Brief von Werner Kraft an Max Horkheimer, 30.04.1940;

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"German Economy, Politics and Culture, 1900-1933. A Research Project of the International Institute of Social Research" (1940):; 1. Umriß des Forschungsprojekts, a) Fassung vom 29.7.1940, Typoskript, 55 Blatt, b)-d) Fassung vom 6.6.1940: b) Typoskript, 55 Blatt, c) Typoskript mit handschriftlichen Korrekturen, 60 Blatt, d) Typoskript, 60 Blatt;

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Vorbesitzer: Bernhard Waldschmidt;

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The exchangeable cation compositions of organic-poor terrigenous sediments containing smectite as primary ion exchanger from a series of holes along ODP Leg 168 transect on the eastern flank of the Juan de Fuca Ridge have been examined as a function of distance from the ridge axis and burial depth. The total cation exchange capacity (CEC) values of the sediments ranged from 2 to 59 meq/100 g, increasing with increases in the wt.% smectite. At the seafloor, the exchangeable cation compositions involving Na, K, Mg, and Ca, expressed in terms of equivalent fraction, are nearly constant regardless of the different transect sites: XNa = 0.21 ± 0.04, XK = 0.08 ± 0.01, XMg = 0.33 ± 0.09, and XCa = 0.38 ± 0.09. The calculated selectivity coefficients of the corresponding quaternary exchange reactions, calculated using porewater data, are in log units -5.45 ± 0.39 for Na, 1.97 ± 0.49 for K, 0.42 ± 0.41 for Mg, and 3.06 ± 0.69 for Ca. The exchangeable cation compositions below the seafloor change systematically with distance from the ridge crest and burial depth, conforming to the trends of the same cations in the porewaters. The selectivities for Na and Mg are roughly constant at temperatures from 2 to 66°C, indicating that the equivalent fractions of these two cations are independent of sediment alteration taking place on the ridge flank. Unlike Na and Mg, the temperature influence is significant for K and Ca, with Ca-selectivity decreases being coupled with increases in K-selectivity. Although potentially related to diagenetic and/or hydrothermal mineral precipitation or recrystallization, no evidence of such alteration was detected by XRD and TEM. In sites where upwelling of hydrothermal fluids from basement is occurring, the K-selectivity of the sediment is appreciably higher than at the other sites and corresponds to the formation of (Fe, Mg) rich smectite and zeolites. Our study indicates that local increases in K-selectivity at hydrothermal sites are caused by the formation of these authigenic minerals.