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  • C38-Classification Methods  (1)
  • Fluorites  (1)
  • Oxford University Press  (1)
  • Wiley-Blackwell  (1)
  • American Chemical Society (ACS)
  • American Institute of Physics (AIP)
  • Institute of Physics
  • Periodicals Archive Online (PAO)
  • 2015-2019  (1)
  • 1975-1979  (1)
  • 1935-1939
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  • Oxford University Press  (1)
  • Wiley-Blackwell  (1)
  • American Chemical Society (ACS)
  • American Institute of Physics (AIP)
  • Institute of Physics
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  • 2015-2019  (1)
  • 1975-1979  (1)
  • 1935-1939
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  • 1
    ISSN: 0570-0833
    Keywords: SEPIL (selectively exiting probe ion luminescence) ; Defect chemistry ; Fluorites ; Analytical methods ; Luminescence ; Solid-state reactions ; Trace analysis ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Although it has been recognized for many years that the spectra of lanthanoid ions can provide useful information about short range phenomena in the neighborhood of these inos in a solid material, lanthanoid spectroscopy has only infrequently been used for studying complex materials because of the problem of line-sorting the complex spectra that are obtained. The advent of convenient tuneable lasers has eliminated this problem. By selectively exciting probe ion luminescence (SEPIL), it is possible to obtain fluorescence and excitation spectra from a single kind of crystallographic environment. Two applications of this method are dicussed in this paper. The first application is the study of the defect chemistry of fluorite materials (compounds with CaF2 lattice). It is shown how this method can provide unique information about the solid state chemistry, thus clarifying many of the unexplained behaviors of this important class of material. The second application shows application shows how ultra-trace analysis can be carried out by causing an association between an analyte ion and a fluorecent probe ion. The unique crystal field levels of a probe ion associated with a particular analyte can be selectively excited so that traces of the ion to be analyzed can be detected with very high selectivity and with very low detection limits.
    Additional Material: 25 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2016-02-04
    Description: Clusters are geographic concentrations of industries related by knowledge, skills, inputs, demand and/or other linkages. There is an increasing need for cluster-based data to support research, facilitate comparisons of clusters across regions and support policymakers in defining regional strategies. This article develops a novel clustering algorithm that systematically generates and assesses sets of cluster definitions (i.e., groups of closely related industries). We implement the algorithm using 2009 data for U.S. industries (six-digit NAICS), and propose a new set of benchmark cluster definitions that incorporates measures of inter-industry linkages based on co-location patterns, input–output links, and similarities in labor occupations. We also illustrate the algorithm’s ability to compare alternative sets of cluster definitions by evaluating our new set against existing sets in the literature. We find that our proposed set outperforms other methods in capturing a wide range of inter-industry linkages, including the grouping of industries within the same three-digit NAICS.
    Keywords: C38-Classification Methods ; Cluster Analysis ; Factor Models
    Print ISSN: 1468-2702
    Electronic ISSN: 1468-2710
    Topics: Geography , Economics
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