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  • Springer  (64)
  • American Chemical Society  (15)
  • National Academy of Sciences  (13)
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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 24 (1976), S. 443-448 
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Environmental science & technology 12 (1978), S. 692-695 
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Biochemistry 13 (1974), S. 440-443 
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 26 (1978), S. 1471-1472 
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1436-6304
    Keywords: Production scheduling ; dynamic setup change ; Produktionsablaufplanung ; stochastisches Flow-Shop-Problem
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Zusammenfassung Wir betrachten ein zweistufiges Produktionssystem, in dem zwei Produkte mit konstanten produktspezifischen Produktionsgeschwindigkeiten und Rüstzeiten bearbeitet werden. Zwischen den beiden Maschinen sind zwei produktspezifische Puffer angeordnet. Die Nachfragerate für jedes Produkt ist abschnittsweise konstant. Jede Maschine unterliegt zeitabhängigen Störungen. Die fehlerfreien Laufzeiten und die Reparaturzeiten sind exponentialverteilte Zufallsvariablen, wobei Rüst- und Bearbeitungsvorgänge nach einer störungsbedingten Unterbrechung ohne Verlust fortgesetzt werden. Wir modellieren das Produktionssystem als zeit- und mengenkontinuierlichen Prozeß. Es wird das Problem der Bestimmung der optimalen Kontrollpolitik mit dem Ziel der Minimierung der diskontierten Kosten bei unendlichem Horizont formuliert. Zur Bestimmung der Struktur der optimalen Kontrollpolitik wird eine diskretisierte Version des Problems mit Hilfe der dynamischen Programmierung unter Berücksichtigung einer stückweise linearen Strafkostenfunktion gelöst. Anschließend wird ein Algorithmus entwickelt, mit dem geringe Lagerbestände bei gleichzeitiger Erfüllung der Nachfrage erreicht werden können. Der Algorithmus, der auf einer hierarchischen Kontrollstruktur basiert, dient zur Bestimmung der Produktionszeitpunkte, wobei in Echtzeit auf zufällige Störungen im System reagiert werden kann. Die Leistungsfähigkeit des Verfahrens wird anhand eines Simulationsmodells mit alternativen Politiken verglichen.
    Notes: Abstract In this paper, we study a manufacturing system consisting of two machines separated by two intermediate buffers, and capable of producing two different products. Each product requires a constant processing time on each of the machines. Each machine requires a constant non-negligible setup change time from one product to the other. The demand rate for each product is considered to be piecewise constant. Each machine undergoes failure and repair. The time-to-failure and time-to-repair are exponentially distributed random variables. The setup change and processing operations are resumable. We model our system as a continuous time, continuous flow process. An optimal control problem is formulated for the system to minimize the total expected discounted cost over an infinite horizon. To determine the optimal control policy structure, a discrete version of the problem is solved numerically using a dynamic programming formulation with a piecewise linear penalty function. A real-time control algorithm is then developed with the objective of maintaining low work-in-process inventory and keeping the production close to the demand. The algorithm uses a hierarchical control structure to generate the loading times for each product on each machine in real time and to respond to random disruptions in the system. The system is simulated using this algorithm to study its performance. The performance of the algorithm is also compared to alternative policies.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Annals of operations research 38 (1992), S. 453-484 
    ISSN: 1572-9338
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract This paper describes the design and implementation of the prototype structured modeling environment FW/SM. The underlying design principles provide the central focus. Other points of interest include discussions of FW/SM's delivery platform, its interface to external packages, and its optimization interfaces. The intended audience is all modeling system evaluators, designers, and implementors, including those who do not happen to take a structured modeling approach.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 27 (1976), S. 791-800 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zusammenfassung Das elastodynamische Spannungsgebiet um einen pfennigförmigen Bruchriss, der mit konstanter Geschwindigkeit in einem unendlichen Körper läuft, wird als Summe der verbundenen statischen Lösung und der Wellenwirkungsterme aufgefasst. Die Ergebnisse schliessen das Spannungsgebiet im Bereich des laufenden Bruchrisses und die zugehörigen statischen Lösungen als Sonderlösungen ein. Die Ringspannung der Risspitze, πθθ wird als Funktion der RissgeschwindigkietV, der Geschwindigkeit der Scherungswellec 2, der Poissonzahl ν und des Winkels θ zwischen der Bruchebene und einer Radiallinie von der Risspitze aus ausführlich studiert. Die Theorie sagt aus, dass der laufende Riss bei der kritischen Geschwindigkeit von 0.665c 2 in der Richtung θ=41° für ν=0.25 zu gabeln anfangen kann. Der vorausgesagte Gabelungswinkel wird mit Versuchserfahrungen verglichen.
    Notes: Abstract The elastodynamic stress field around a penny-shaped crack running at a constant speed in an infinite solid is obtained as the sum of the associated static solutions and the wave-effect terms. The results include the stress field in the plane of the running crack and the associated static solutions as special solutions. The crack-tip circumferential stress, πθθ, is studied in detail as a function of the crack speed,V, the shear wave speed,c 2, Poisson's ratio, ν, and the angle, θ, between the crack plane and a crack-tip radial line. The theory predicts that the running crack may start to bifurcate at the critical speed of 0.665c 2 in the direction θ=41° for ν=0.25. The bifurcation angle predicted is compared to an experimental observation.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1420-9136
    Keywords: Radon ; Groundwater ; Earthquakes ; Taiwan
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Radon (222Rn) concentration in geothermal waters and CO2-rich cold springwaters collected weekly in duplicate samples from four stations in northern Taiwan were measured from July 1980 to December 1983. Seven spike-like radon anomalies (increases of 2 to 3 times the standard deviation above the mean) were observed at three stations. Following every anomaly except one, an earthquake ofM L above 4.6 occurred within 4 to 51 days, at an epicentral distance 14 to 45 km, and at a focal depth of less than 10 km. The distribution of the earthquakes preceded by radon anomalies is skewed in certain directions from the radon stations; the radon stations seem to be insensitive to earthquakes occurring in the other directions. At the fourth station, near a volcanic area, much gas (mainly CO2) is discharged from the well, together with hot water. A very high concentration of radon was detected in the discharged gas; therefore trapping of gas in the water can result in anomalously high radon contents. According to limited measurements, the radon concentration in water appears to be undersaturated with respect to that in gas. This suggests that hot water is very susceptible to radon loss, and monitoring of radon in gas is more desirable.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 37 (1981), S. 1242-1245 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The structure 3-butyl-5-propylindolizidine (2), tentatively assigned to a minor alkaloid in skin extracts from a number of poison frogs of the Neotropical genusDendrobates, has been confirmed and its stereochemistry determined as 5E, 9E (2d) by comparison on GC and GC-MS with the four synthetic diastereomers2a-2d.
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