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  • 1
    Electronic Resource
    Electronic Resource
    Citation Analysis of Cuban Research. Part 1. A Case Study: The Cuban Journal of Agricultural Science (2000)
    Springer
    Scientometrics 47 (2000), S. 413-426 
    Details
    ISSN: 1588-2861
    Source: Springer Online Journal Archives 1860-2000
    Topics: Information Science and Librarianship , Nature of Science, Research, Systems of Higher Education, Museum Science
    Notes: Abstract Bibliometric analyses of research in developing countries are interesting for various reasons. The situation of Cuba is rather exceptional. The Cuban Journal of Agricultural Science (CJAS) is the only Cuban research journal, indexed by the Institute of Scientific Information's Web of Science (WoS). We explore the possibilities of a citation analysis for Cuban research publications in general and for those in CJAS in particular. For the period 1988–1999, we find that this journal represents 14% of Cuban research publications, cited in the WoS. We remark that the number of self citations is relatively high and even increases since 1995. The results are classified by disciplines and we use a co-citation matrix to discuss the different observed citation patterns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005655530277
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A TXRF and Micro-Raman Spectrometric Reconstruction of Palettes for Distinguishing Between Scriptoria of Related Medieval Manuscripts (1998)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 639-644 
    Details
    ISSN: 1434-1948
    Keywords: Manuscripts ; Scriptoria ; TXRF ; Micro-Raman spectroscopy ; Pigments ; Middle ages ; Azurite ; Gold initials ; Workshops ; Renaissance ; Mercatellis ; Codicology ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Assigning related medieval manuscripts to different workshops on the basis of codicological characteristics, is not straightforward. We present the first attempt to distinguish between scriptoria by means of a large-scale total reflection X-ray fluorescence (TXRF) analysis of pigment elements and an identification of pigment molecules with micro-Raman spectroscopy. We analyzed 324 colored items in 10 medieval manuscripts, of which 7 are folio-sized illuminated manuscripts, all ordered by Raphael de Mercatellis in the late 15th and early 16th century. Palettes in miniatures were not yet examined. Blue palettes are exclusively azurite-based and are easily differentiated by means of the respective amounts of Ti, Ba, and As. Differences for green palettes are also pronounced. The green Cu-based pigment was not yet identified, but it certainly is not malachite or verdigris. Red pigments used are HgS, vermilion, and Pb3O4, red lead. The Flemish gold-leaf technique is used. The 7 Mercatellis manuscripts show two different palettes, both different from the non-Mercatellis manuscripts. The grouping of the Mercatellis manuscripts according to date and to palettes is, in general, consistent with a grouping on the basis of a classical codicological analysis, although some conflicting results are obtained. A quantitative and qualitative reconstruction of palettes by means of TXRF- and Raman-spectra, provides with a complimentary and objective tool for distinguishing between scriptoria.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 3
    Electronic Resource
    Electronic Resource
    A Universal Two-Parameter Kratzer-Potential and Its Superiority over Morse's for Calculating and Scaling First-Order Spectroscopic Constants of 300 Diatomic Bonds (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 1617-1642 
    Details
    ISSN: 1434-1948
    Keywords: Calculations ; Bond theory ; Electronic structure ; Molecular dynamics ; Kratzer ; Morse ; Potential energy curve ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: After decades of intensive research, the question remains whether or not a universal two- or three-parameter potential exists. For a large number of about 300 bonds, we now critically review the constraints for potentials and asymptotes, involved in three available scaling processes (Varshni, Calder-Ruedenberg, and Graves-Parr). We show that the covalent Sutherland parameter can never be a universal scaling factor. This implies that the usual constraint U(R) = -De at R = ∞ for potentials is only desirable and that the natural asymptote De is not even needed to explain the relations between the constants. We show that ionic potentials of generalized Kratzer-type (Varshni's Vth potential) and their ionic Coulomb-like asymptotes Ae2/Re (with A close to 1) behave as simple universal two-parameter potentials. For both αe and ωexe, this potential gives percentage deviations 2 to 3 times smaller than Morse's three parameter potential for hundreds of bonds. We also prove that the Graves-Parr scaling hypothesis is valid, despite these authors' own conclusion. We discuss various new relations between spectroscopic constants.Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2005/1999/99005_s.pdf or from the author.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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