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  • kalte Redundanz  (1)
  • liquid precursor  (1)
  • Springer  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    OR spectrum 14 (1992), S. 129-136 
    ISSN: 1436-6304
    Keywords: Reliability ; cold standby ; Zuverlässigkeit ; kalte Redundanz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Zusammenfassung Untersucht wird die Zuverlässigkeit eines Systems mit kalter Redundanz und Reparaturmöglichkeiten. Ist eine Einheit ausgefallen, dann wird diese mit der Rate μ repariert; falls jedoch bei Ausfall der tätigen Einheit bereits eine andere Einheit repariert wird, dann erhöht sich die Reparaturrate aufβ 〉μ. Die Reparaturrate bleibt während einer Periode mit zufälliger Länge auf diesem höheren Niveau und fällt dann wieder auf das Normalniveau zurück. Nach Abschluß der laufenden Reparatur wird sie ebenfalls wieder zurückgeschaltet. Für den Fall eines Systems mit zwei Einheiten in kalter Redundanz werden einige Operationscharakteristiken explizit berechnet. Dabei wird vorausgesetzt, daß die Lebensdauer der tätigen Einheit entweder eine exponentialverteilte oder eine beliebig verteilte unabhängige Zufallsgröße ist, während die Reparaturdauern exponentialverteilt sind. Schließlich werden Kosten eingeführt und statische Optimalitätsbedingungen hergeleitet.
    Notes: Summary This paper considers the reliability of a redundant system with cold standby and a single repair facility. It introduces some managerial controls and environmental constraints. Normally the repair rate isμ. However, on failure of the online unit the repair rate is geared up to a higher rateβ〉μ, if the repair facility is busy. It will stay at this higher level till the end of a random period or a repair completion, whichever occurs first. Some performance measures for a two unit cold standby system are obtained for the case of exponentially as well as arbitrarily distributed lifetimes, assuming all the other distributions to be exponential. Finally costs are taken into account explicitly and some static optimizations are considered.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials synthesis and processing 6 (1998), S. 89-104 
    ISSN: 1573-4870
    Keywords: Nanoparticles ; silver ; laser–liquid–solid interaction ; liquid precursor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Silver nanoparticles of high chemical homogeneity have been synthesized by a novel laser–liquid–solid interaction technique from a solution composed of silver nitrate, distilled water, ethylene glycol, and diethylene glycol. Rotating nickel, niobium, stainless steel, and ceramic Al2O3 substrates were irradiated using a continuous-wave CO2 laser and Q-switched Nd–YAG laser (λ = 1064 and 532 nm). The silver nanoparticles were characterized using x-ray diffraction (XRD), scanning electron microscopy (SEM), and electron probe x-ray microanalysis (EPMA). The shape of silver particles was dependent on the chemical composition and laser parameters. The synthesis mechanism of silver nanoparticles has been proposed to occur primarily at the laser–liquid–substrate interface by a nucleation and growth mechanism.
    Type of Medium: Electronic Resource
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