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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Insurance Mathematics and Economics 13 (1993), S. 151 
    ISSN: 0167-6687
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Mathematics , Economics
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The sensitivity and applicability of the synchrotron radiation induced X-ray microfluorescence (μ-SRXRF) spectrometer at the Hamburg synchrotron laboratory Hasylab for the determination of the distribution of trace concentrations of rare-earth elements (REE) in fossilized bone are discussed and critically compared to those of other trace analytical methods such as instrumental neutron activation analysis (INAA) and LAMP-ICPMS (laser ablation microprobe inductively-coupled plasma mass spectrometry). Measurements were carried out on two bone samples from contrasting terrestrial depositional environments at Olduvai Gorge (Tanzania). Results indicate that the microdistribution of the REE in these biological materials is not homogeneous and that the relative abundance of these elements can provide information on the palaeoenvironment during the fossilization process. The heterogeneous distribution of the REE can be determined in a quantitative and completely non-destructive manner provided the concentrations of individual REE are above 10 μg/g.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 325 (1986), S. 611-615 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Cyclic voltammetry on solid phases using the carbon-paste electrode (CPE) has been applied to the In- In2O3 system. Electrochemical reactions can be recorded more sensitively, and interpretation of the complex processes is simpler with AC voltammetry. Additional electrochemical experiments concerning the condition of formation and the chemical stability of intermediates yielded a model of electrochemical reactions in connection with preliminary and consecutive chemical processes. It is possible to detect unambiguously In and In2O3 simultaneously in 1 N HBr, but not in 1 N HCl.
    Notes: Zusammenfassung Die cyclische Voltammetrie unter Verwendung der Kohlepasteelektrode wurde am System In- In2O3 angewandt. Durch den Einsatz der Wechselstrom-Voltammetrie können die elektrochemischen Reaktionen empfindlicher erfaßt und komplexe Prozesse klarer interpretiert werden. Ergänzende elektrochemische Experimente zur Aufklärung der Bildungsbedingungen und chemischen Stabilität von Zwischenprodukten ergeben ein Modell der elektrochemisch auswertbaren Reaktionen unter Berücksichtigung vor- und nachgelagerter chemischer Prozesse. Es ist in 1 N HBr, nicht aber in 1 N HCl, möglich, In und In2O3 eindeutig nebeneinander nachzuweisen.
    Type of Medium: Electronic Resource
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