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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    International Journal of Radiation Applications & Instrumentation. Part 41 (1990), S. 989-993 
    ISSN: 0883-2889
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    The @International Journal Of Applied Radiation And Isotopes 34 (1983), S. 1291-1299 
    ISSN: 0020-708X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Archive of applied mechanics 62 (1992), S. 210-221 
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Übersicht Es wird eine Schwingungsdiagnose beschrieben, die parametrische elastische Einspannbedingungen, Massenverteilungen und Biegesteifigkeiten von Balken konstanten Querschnitts zu identifizieren erlaubt. Hierfür genügt eine Einpunkt-Erregung des Balkens und die Messung in einem weiteren Punkt. Dieses wird durch eine on-line Anpassung der Erregung erreicht. Zwei adaptive Vorgehensweisen werden angewendet. Die Diagnose beginnt mit drei gemessenen Eigenfrequenzen. Es wird gezeigt, daß selbst relativ große Unsicherheiten in den Eigenfrequenzen (∼0,5%) akzeptabel sind. Die adaptive Diagnose wird simulationsmäßig erprobt.
    Notes: Summary This paper develops a vibrational diagnosis which identifies the boundary stiffnesses, mass density and flexural stiffness of a uniform beam. Dynamic excitation of the beam at one point and displacement measurements at a single position are sufficient. The need for measurements or excitations at different points along the beam is eliminated by on-line choice of the excitations, thus dynamically adapting the excitations to the assayed beam. Two different types of adaptive measurements are employed. The diagnosis is initiated by measuring three eigenfrequencies. It is shown that fairly large uncertainty (∼0.5%) in these measurements is acceptable. The adaptive diagnosis is tested by simulation.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Water, air & soil pollution 123 (2000), S. 337-352 
    ISSN: 1573-2932
    Keywords: bleaching ; bacterial infection ; coral ; Oculina ; temperature ; toxin ; zooxanthellae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Bleaching in stony-corals is the result of disruption of symbiosis between the coral hosts and photosynthetic microalgal endosymbionts (zooxanthellae). Coral bleaching events of unprecedented frequency and global extent have been reported during the last two decades. Recently, we demonstrated that bleaching of the coral Oculina patagonica in the Mediterranean Sea is caused by the bacterium Vibrio shiloi, when seawater temperature rises and allows the bacterium to become virulent. The first step in the infection process is host-specific adhesion of V. shiloi to O. patagonica via a β-galactoside receptor on the coral surface. The bacterium then penetrates into the coral tissue and produces extracellular materials which rapidly inhibit photosynthesis of zooxanthellae and bleach and lyse the algae. The inhibition of pothosynthesis is due to a low molecular weight, heat stable toxin and ammonia. Bleaching and lysis are due to a heat-labile, high molecular weight materials, probably lytic enzymes. Elevated temperature induces different virulence factors within the infectious agent of the disease, V. shiloi. Adhesion was found to be temperature-regulated. When the bacteria were grown at 16°C there was no adhesion to corals maintained at either 25°C or 16°. However, when the bacteria were grown at 25°C they adhered avidly to corals maintained at 16°C and 25°C. In addition, the production of lytic enzymes and the photosynthesis inhibitor was also found to be temperature dependent. Production of the latter toxin was ten times greater at 29°C than at 16°C, and extracellular protease was 5-fold higher in cultures grown at 29°C than at 16°C. The data presented here suggest an explanation for the correlation between elevated seawater temperatures and seasonal coral bleaching.
    Type of Medium: Electronic Resource
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