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  • 11
    ISSN: 1436-6304
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Summary The following contribution describes the planning of the production in a metallurgical plant with four blast furnaces. Basing on a fixed demand for pig iron per day which is to be fulfilled, it is to decide, how the production is to distribute among the four blast furnaces, when the costs of production are to be minimized. Subsequently the problem is extended by changing the demand for pig iron step by step. The optimal solution of this problem is achieved by using the methods of linear programming and mathematical statistics.
    Notes: Zusammenfassung Der folgende Beitrag beschreibt die Produktionsplanung für ein Hochofenwerk mit vier Hochöfen. Ausgehend von einer fest vorgegebenen Erzeugungsmenge muß entschieden werden, wie die Produktion auf vier Hochöfen zu verteilen ist, damit die Produktionskosten das Minimum erreichen. Für die Lösungsdarstellung wird die zu erzeugende Roheisenmenge schrittweise verändert. Die optimale Lösung wird mit Hilfe der Linearen Optimierung und der mathematischen Statistik ermittelt.
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 338 (1990), S. 127-132 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Medieval Arabian silver coins were analyzed by means of secondary neutral mass spectrometry (SNMS). Mercury deposits have been detected up to a depth of 10 μm. In the surface region enrichments of halogen have been determined, which may indicate an influence of marine climatic conditions on the coins. The application of SNMS analysis on problems of archeometry proved it to be a rapid quantitative method for surface and bulk composition and leads to new aspects of material characterization.
    Type of Medium: Electronic Resource
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  • 13
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 346 (1993), S. 147-150 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary For the assessment of the correctness of depth profile analyses with non-ideal technical metal surfaces using secondary neutral particle mass spectrometry (SNMS), the roughness of the sample surface was examined for the transition width of the signal. It is shown that with elements with low sputter rates (Al Mn), similar to that of the substrate element (Fe), there is no significant influence of the roughness. However, clear dependencies are observed for tin and zinc, elements with high sputter rates. Whereas tin gave acceptable results when the roughness was significant, cone formation was observed with zinc which caused abnormal sputter behaviour. The use of high-frequency sputter processes eliminates this cone formation and leads to constant signals, even with thick zinc layers. This method is therefore not only suitable for use with non-conductors, as originally planned, but also offers considerable advantages in the analysis of metal coatings.
    Type of Medium: Electronic Resource
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