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  • DRS  (1)
  • M/G/1 queue  (1)
  • bifunctional catalysis  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    On inference concerning time-dependent queue performance: The M/G/1 example (1990)
    Springer
    Queueing systems 6 (1990), S. 261-275 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF02411477
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Factors influencing the catalytic activity of titanium silicalites in selective oxidations (1991)
    Springer
    Catalysis letters 8 (1991), S. 237-244 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00764122
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Mechanism of the paring reaction of naphtenes (1996)
    Springer
    Catalysis letters 37 (1996), S. 207-212 
    Details
    ISSN: 1572-879X
    Schlagwort(e): bifunctional catalysis ; paring reaction ; 1-cyclohexyloctane ; naphtenes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract 1-cyclohexyloctane is isomerized on the large pore, bifunctional zeolite catalyst Pt/H-Y. The detailed isomerization mechanism of this naphtene molecule is revealed through a thorough analysis of the numerous isomerization products. It is found that methyl side-chains are generated on the ring of the molecule via a ring contraction-expansion mechanism, which are subsequently transferred to then-alkyl substituent via methyl shifts. Direct branching of then-alkyl chain is a much slower process compared to the generation of methyl substituents on the ring.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00807755
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