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  • Constructs  (1)
  • DRS  (1)
  • approximations  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Catalysis letters 8 (1991), S. 237-244 
    ISSN: 1572-879X
    Schlagwort(e): Titanium silicalite ; oxidation catalyst ; hydrogen peroxide adsorption ; IR ; DRS
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Titanium silicalites synthesized via different procedures are tested in the oxidation of phenol, l-octene and n-hexane by aqueous H2O2. It is shown that the presence of titanyl groups, on which H2O2 is activated by formation of titanium peroxo complexes, is a prerequisite for oxygenation activity. Furthermore, in order to afford high selectivities, titanium silicalites should be free of impurities which cause acid catalyzed side reactions or H2O2 decomposition.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Queueing systems 6 (1990), S. 261-275 
    ISSN: 1572-9443
    Schlagwort(e): M/G/1 queue ; time-dependent behavior ; approximations ; exponential approach to equilibrium ; numerical inversion of Laplace transforms
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Notizen: Abstract This paper proposes easily-computed approximations to the finite-time expected waiting time for anM/G/1 system starting from an empty state. Both unsaturated (ρ〈1) and saturated (ρ〉1) conditions are considered. Numerical evidence is presented to indicate that the quality of the approximations is usefully good, especially when ease of computation is an issue. Further, the methodology is adapted to assess expected waiting time when inference must be made from a random sample of service times, and the decision is made to do so nonparametrically, i.e., without fitting a specific function. The results appear reasonable and potentially useful, and are not burdensome to obtain. The methodology investigated can also be applied to the variety of queueing models that are close siblings ofM/G/1: priority and breakdowns and “vacations” being examples. Of course other approximating and inferential options remain to be investigated.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    ISSN: 1573-2649
    Schlagwort(e): Constructs ; domains ; health ; salmeterol
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The quality of life (QOL) benefits of salmeterol versus placebo were compared in a double-blind, multicentre study using the Living with Asthma Questionnaire (LWAQ) which was scored in three different ways. First, the overall LWAQ score showed that salmeterol enhanced QOL compared to placebo. Second, when the LWAQ was analysed in terms of its two construct subscales we found, as predicted previously, that the Problem construct was more sensitive to longitudinal change compared with the Evaluation construct. Third, when the LWAQ was analysed in terms of its 11 domain subscales we found a significant improvement for salmeterol compared with placebo on three domains, Sport, Sleep, and Work and other activities. Analysing clinical trial results in terms of construct subscales and domain subscales provides different kinds of information each of which is useful. Analysis in terms of overall QOL scores is less informative.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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