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  • 1
    Electronic Resource
    Electronic Resource
    γ and X rays from the zodiacal dust (1979)
    [s.l.] : Nature Publishing Group
    Nature 278 (1979), S. 723-725 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Idealised mass density as a function of grain size of the zodiacal dust. This was adapted from Giese and Griin's6 maximum model. The abscissa shows particle radii for two different assumed grain material densities; also indicated is the corresponding grain mass. This graph shows that the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/278723a0
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  • 2
    Electronic Resource
    Electronic Resource
    Distance limit for a class of model γ -ray burst sources (1978)
    [s.l.] : Nature Publishing Group
    Nature 271 (1978), S. 525-527 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Some of the available spectral burst data3"8 show a significant flux of photons in the 〉 1 MeV range3"5-8. The 27 April 1972, event observed by Apollo 16 (ref. 3) shows at higher energies a power law spectrum with a possible line feature around 4 MeV. However, power law spectra and lines cannot ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/271525a0
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  • 3
    Electronic Resource
    Electronic Resource
    VB calculations with orthogonal basis functions (1978)
    Springer
    Theoretical chemistry accounts 47 (1978), S. 193-203 
    Details
    ISSN: 1432-2234
    Keywords: VB method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract As a first step in the development of a semiempirical VB method,ab initio VB calculations were performed to obtain potential energy curves for the molecules HF and BeH2 and the energy profile of the collinear exchange reaction F + H2 → HF + H. The applicability of the method is discussed with particular emphasis on the calculation of integrals over OAO's, the choice of valence structures to be included in the CI scheme and the interpretation of the wave function in terms of OAO's.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00577161
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  • 4
    Electronic Resource
    Electronic Resource
    Buchbesprechungen (1977)
    Springer
    Naturwissenschaften 64 (1977), S. 650-652 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00440117
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  • 5
    Electronic Resource
    Electronic Resource
    Simultaneous approximation to algebraic numbers by elements of a number field (1975)
    Springer
    Monatshefte für Mathematik 79 (1975), S. 55-66 
    Details
    ISSN: 1436-5081
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A special case of the main result is as follows. Given a number fieldK a number ɛ〉0 and real or complex algebraic numbers ξ1,...,ξ n with 1, ξ1,...,ξ n linearly independent overK, there are only finitely many α=(α1,...,α n ) with components inK and with |ξ1,...,α1| whereH(α) is a suitably defined height.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01533775
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  • 6
    Electronic Resource
    Electronic Resource
    Two questions in diophantine approximation (1976)
    Springer
    Monatshefte für Mathematik 82 (1976), S. 237-245 
    Details
    ISSN: 1436-5081
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract The first question is about a possible variation on Dirichlet's approximation theorem for linear forms αx+βy+z, wherex,y are restricted topositive integers. The second question, which turns out to be related to the first, is about approximation to elements in a power series fieldk((t −1)) by solutions β of first order linear differential equationsxβ′+yβ+z=0, wherex,y,z are polynomials int.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01526328
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  • 7
    Electronic Resource
    Electronic Resource
    Contributions to diophantine approximation in fields of series (1979)
    Springer
    Monatshefte für Mathematik 87 (1979), S. 145-165 
    Details
    ISSN: 1436-5081
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract The following topics are taken up: (i) the dimension of certain vector spaces defined in terms of denominations of differential polynomials, (ii) examples of series for which a Thue-Siegel-Roth type theorem holds, (iii) approximation of linear forms whose coefficients satisfy algebraic differential equations, and (iv) rational approximations to solutions of algebraic difference-differential equations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01305913
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  • 8
    Electronic Resource
    Electronic Resource
    Anreicherung und Bestimmung von Blei in Boden- und Sedimentaufschlüssen und -extrakten mit der Flammenatomabsorption (1978)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 291 (1978), S. 213-216 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Blei in Boden, Sedimenten ; Spektralphotometrie, Atomabsorption ; Flamme, Reextraktion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung In Vorversuchen wurde gezeigt, da\ beim Aufbewahren der organischen APDC/MIBK-Extrakte starke Bleiverluste auftraten. Daher war es notwendig, das Blei mit SalpetersÄure in die wÄ\erige Phase zu reextrahieren. Wiederfindungsversuche bestÄtigten, da\ Extraktion und Reextraktion quantitativ verlaufen. Das Blei wird dabei um den Faktor fünf angereichert. Es werden mittlere Standardabweichungen für vier Konzentrationsbereiche angegeben. Als Nachweisgrenze wurde eine Konzentration von 0,16 mg Pb/l gefunden, die durch die Anreicherung auf ca. 0,03 mg Pb/l gesenkt wird. Arbeitsvorschriften für das Verfahren sind angegeben.
    Notes: Summary Preliminary investigations have shown, that considerable losses of lead occur during storage of the organic APDC/MIBK-extracts. Therefore, it was necessary to reextract lead into the aqueous phase by nitric acid. Investigations of recoveries confirmed, that extraction and reextraction of lead were quantitative. In this way the concentration of lead is increased by a factor of five. Mean standard deviations for four concentration ranges are given. A detection limit of 0.16 mg of Pb/l is obtained, which is lowered by the preceding enrichment to about 0.03 mg of Pb/l. Details of the procedure are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00480692
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  • 9
    Electronic Resource
    Electronic Resource
    Bestimmung von Cadmium in Boden- und Sedimentaufschlüssen und -extrakten mit der flammenlosen Atomabsorption in Zirkonium-beschichteten Graphitrohren (1979)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 295 (1979), S. 110-115 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Cadmium in Boden, Sedimenten ; Spektralphotometrie, Atomabsorption ; Zr-beschichtete Graphitrohre
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird ein Verfahren beschrieben, das es gestattet, nach einer Anreicherung von Cadmium durch Extraktion mit APDC/MIBK und anschließender Reextraktion mit Salpetersäure, die stark salpetersaueren Reextrakte direkt in Zirkonium-beschichteten Graphitrohren bei Verwenden der flammenlosen Atomabsorption zu vermessen. Diese Rohre zeigten eine gute Lebensdauer (150–300 Analysen). Durch eine Behandlung der Rohre mit einer Fe3+-Lösung konnten Beeinflussungen der Cadmiumsignale durch Begleitstoffe verhindert werden. Cadmium wird bei der Extraktion und Reextraktion um den Faktor fünf angereichert. Bei hohen Cadmiumgehalten in den Proben kann die Analyse bei gleicher Probenvorbereitung mit Hilfe der Flammenatomabsorption durchgeführt werden. Die Arbeitsbedingungen für die flammenlose, sowie für die Flammen-Atomabsorption werden angegeben. Als Nachweisgrenzen bei Verwenden der flammenlosen Atomabsorption wurden im Mittel 0,53 μg Cd/l, für die Flammenatomabsorption 19,4μg Cd/l gefunden, die durch die Anreicherung auf ca. 0,1, bzw. 4 μg Cd/l gesenkt werden.
    Notes: Summary Cadmium is enriched by an extraction with APDC/MIBK and subsequent reextraction with nitric acid. A procedure is described for analyzing these solutions directly by means of flameless atomic absorption, inspite of the high concentration of nitric acid in a zirconium coated graphite tube. These tubes, proved to be very resistant (150–300 analyses). After treatment of the tubes with a Fe3+-solution no interference by accompanying anions and cations could be observed. By the extraction and reextraction procedure described cadmium is enriched by a factor of five. Samples of higher cadmium concentrations were analyzed by means of flame atomic absorption after the same sample preparation. Working conditions for flameless and flame atomic absorption are given. Detection limits have been calculated as 0.53 μg Cd/l in the case of flameless, 19.4 μg Cd/l in the case of flame atomic absorption. These values are further decreased by the above enrichment procedure to 0.1 and 4 μg Cd/l, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01171496
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  • 10
    Electronic Resource
    Electronic Resource
    Small zeros of additives forms in many variables. II (1979)
    Springer
    Acta mathematica 143 (1979), S. 219-232 
    Details
    ISSN: 1871-2509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02392094
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