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  • 1
    ISSN: 1439-0361
    Keywords: pesticides ; DDE ; polychlorinated biphenyls ; Accipitridae ; Germany
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Insgesamt wurden 60 Resteier des Rotmilans in drei Untersuchungsgebieten im südlichen Teil des Bundeslandes Sachsen-Anhalt zwischen 1987–1993 gesammelt und auf elf persistente Chlorkohlenwasserstoff-Verbindungen und Quecksilber sowie z. T. auf radioaktive Nuklide untersucht: 1. Die Eiproben waren hauptsächlich mit p,p'-DDE, PCB 138, 153 und 180 sowie Hg belastet, jedoch auf einem für die Reproduktion unbedenklichem Niveau. 2. Proben aus Industrie- und Großstadtnähe waren signifikant höher mit den Industrieabprodukten HCB, β-HCH und höherchlorierten PCBs kontaminiert. Proben aus landwirtschaftlich intensiv genutzten Gebieten enthielten mehr p,p'-DDT. p,p'-DDE, Hg und γ-HCH zeigten keine signifikanten Unterschiede in ihrer räumlichen Verteilung. 3. Da die Spitzenwerte der einzelnen Verbindungen in verschiedenen Jahren auftreten, sind die Trends unterschiedlich und zeigen Abnahmen über den gesamten Untersuchungszeitraum hinweg (PCB 52), Abnahmen erst ab 1990/91 (HCB, β- und γ-HCH, Hg) bzw. Anstiege nach vorangegangenem Kontaminationsrückgang (höherchlorierte PCB, p,p'-DDE). Mögliche Ursachen werden diskutiert. 4. Die Untersuchung von vier Eiinhalten von 1988 auf radioaktive Nuklide (Cäsium-Isotope) verlief negativ.
    Notes: Summary Sixty infertile Red Kite eggs were collected in three regions in the southern part of the federal state of Saxony-Anhalt. Their contents were tested for eleven chlorinated hydrocarbons, mercury and partly for radionuclids (radiocesium): 1. The egg samples on average contained p,p'-DDE, PCB 138, PCB 153, PCB 180 and Hg in low concentrations. 2. The samples from an industrial and urban region contained significantly more HCB, β-HCH and high chlorinated PCBs. The contamination of p,p'-DDT was on a higher level in eggs from farmed areas. 3. The trends of the chemicals were different between 1987 and 1993. PCB 52 shows a significant decrease in this time and HCB, β- und γ-HCH, Hg only since 1990/91. p,p'-DDE, PCB 138, PCB 153 and PCB 180 increased up to 1992, after contamination decreased. Possible reasons are discussed. 4. The contents of four eggs from 1988 did not include radiocesium.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Formal aspects of computing 5 (1993), S. 391-431 
    ISSN: 1433-299X
    Keywords: Formalization of development methods ; Logical frameworks
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract This article presents the definition and some basic properties of the Deva meta-calculus, a generic logical framework whose design was driven by the needs arising from the instantiation to software development methods. As a result, Deva contains structures that do not occur in comparable logical frameworks. There now exist a number of case studies about the formalization of software development methods in Deva. In this article, a structured definition of Deva is presented and basic parts of its language theory, viz Church-Rosser, closure, and strong normalization, are summarized.
    Type of Medium: Electronic Resource
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  • 3
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    Unknown
    Baltimore, Md. : Periodicals Archive Online (PAO)
    Bulletin of the history of medicine. 61:1 (1987:Spring) 110 
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Calculus of variations and partial differential equations 7 (1998), S. 373-379 
    ISSN: 1432-0835
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Manuscripta mathematica 101 (2000), S. 125-142 
    ISSN: 1432-1785
    Keywords: Mathematics Subject Classification (1991): 30F60, 32G15, 49Q5, 53A10
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract: We prove the existence of singly periodic minimal surfaces invariant under a translation such that a fundamental piece has arbitrarily many parallel planar ends and arbitrarily high genus. These surfaces generalize the Callahan–Hoffman–Meeks surface. We also discuss briefly the effective computation of the periods and techniques to parameterize these surfaces.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Formal aspects of computing 8 (1996), S. 86-107 
    ISSN: 1433-299X
    Keywords: Formalized mathematics ; Formalized developments ; Logical frameworks ; Literate programming
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract We present an approach to the literate and structured presentation of formal developments. We discuss the presentation of formal developments in a logical framework and distinguish three aspects: language-related aspects, structural aspects of proofs, and presentational aspects. We illustrate the approach by two examples: a simple mathematical proof of the Knaster-Tarski fixpoint theorem, and a formalization of the VDM development of a revision management system.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 81 (1998), S. 770-780 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Absolute rate constants and their Arrhenius parameters are obtained for the addition of a cyclic malonyl radical derived from Meldrum's acid to 20 mono- or 1,1-disubstituted alkenes in (±)-propylene oxide and for the addition of the open-chain di(tert-butyl)malonyl radical to six mono- or 1,1-disubstituted alkenes in 1,1,2-trichloro-1,2,2-trifluoroethane by time-resolved electron spin resonance spectroscopy. At room temperature, the radicals add at the unsubstituted C-atoms with rate constants ranging from 1.1. 105 M-1S-1 (acrolein) to 2.4. 106 M-1S-1 (1,1-diphenylethene). The frequency factors are in the narrow ranges of log (A/M-1S-1) = 8.7 ± 0.1 for the cyclic and log (A/M-1S-1) = 8.2 ± 0.2 for the open-chain malonyl species, whereas the activation energies vary from 12.9 kJ/mol (1,1-diphenylethene) to 21.7 kJ/mol (acrylonitrile). They correlate with the alkene ionization potentials and, more weakly, with the reaction enthalpy. No correlation was found between the activation energies and the alkene electron affinities. Hence, the results confirm and quantify the electrophilic nature of malonyl radicals in addition reactions.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Book
    Book
    Boston u.a. :Artech House,
    Title: ¬An¬ introduction to GSM
    Author: Redl, Siegmund M.
    Contributer: Weber, Matthias K. , Oliphant, Malcolm W.
    Publisher: Boston u.a. :Artech House,
    Year of publication: 1995
    Pages: 379 S.
    Series Statement: Artech House mobile communications library
    Type of Medium: Book
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