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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Experiments in fluids 24 (1998), S. 141-150 
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  The convective heat transfer from a cylinder to a humid air stream flowing normal to the cylinder was investigated experimentally at atmospheric pressure over a range of variables which is relevant to the use of hot‐wire anemometry: air temperatures between 30 °C and 70 °C and velocities between 12 and 37 m/s. For molar fractions of water vapour up to 0.27, the heat transfer increased with increasing humidity. The ratio of heat transfer rates in humid air and dry air is a unique function of the molar fraction of water vapour, independent of the air temperature and flow velocity.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-5052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The spatial distributions of species of tree ≥10 cm gbh were examined in two 4 ha plots and related to the local variation in topography and soil chemistry. The plots were similar in their species composition, particularly in terms of the densities of small trees, and they showed very similar edaphic characteristics. Size class distributions varied little within and between plots. Ordination of 0.25 ha subplots highlighted parallel gradients in the vegetation of both plots when the densities of trees ≥10 cm gbh were considered. Focusing on understorey trees in the 10-〈50 cm gbh class at the 0.04 ha subplot scale showed a similar vegetation gradient in both plots closely associated with change from lower slope to ridge. No relationship with soil chemistry was found. On the ridges a special group of understorey species formed clumps and these species contributed importantly to the ordinations. Borneo has a regional history of occasionally severe droughts. It is suggested here that the observed patterns in the understorey are due to differential responses to low soil water supply, the ridges probably tending to dryness more than the lower slopes. Within the large and diverse family Euphorbiaceae, which dominates the understorey at Danum, there may be ecophysiological groupings of species. The long-term effects of disturbance interacting with local edaphic factors on forest structure and composition are discussed.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 28 (1997), S. 131-141 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Atmospheric Corrosion under Controlled Conditions: Concept and Installation of an Apparatus for Monitoring Pollution Gas Induced Corrosion of Copper and Bronze SamplesThis paper describes an apparatus for the investigation of corrosion of copper and bronze samples on a laboratory scale at the Bayerisches Landesamt für Denkmalpflege, Munich. The chamber allows the influence of SO2 and NO2 contaminated test gas on the samples to be studied in combination with dew formation on the sample surface. By means of cooling and heating of the samples and the use of a gas mixing unit, a defined amount of dew and contamination can be reproducibly applied to the samples. The design and realization of the apparatus, including the component selection and details of construction to satisfy experimental demands, are discussed. Results of commissioning tests are shown, quantifying the homogenity of the chamber climate and the temperature distribution across the samples.
    Notes: Es wird eine Schadgasbewitterungskammer vorgestellt, die für Korrosionsuntersuchungen an Bronze- und Kupferproben im Labormaßstab am Bayerischen Landesamt für Denkmalpflege installiert wurde. In dieser Kammer wird der Einfluß eines SO2/NO2 Schadgasgemisches bei Betauung der Proben untersucht. Dazu wird innerhalb der Kammer mit Hilfe eines reproduzierbar einstellbaren Wechselklimas eine künstliche Bewitterung des Probenmaterials erzeugt. Die Einstellung des Schadgasgehaltes sowie der Luftfeuchtigkeit im zugeführten Testgas erfolgt über eine Gasmischapparatur. Die periodischen Bewitterungs- und Trockenzyklen werden über Abkühlung bzw. Aufheizung der Proben gesteuert. In der vorliegenden Arbeit wird die Konzeption und die Verwirklichung der Anlage beschrieben. Dabei wird auf die Auswahl und Konstruktion der Einzelkomponeten sowie auf die eigentliche Klimagenerierung eingegangen. Untersuchungen zur Homogenität des Kammerklimas sowie zur Temperaturverteilung über die einzelnen Proben schließen die Inbetriebnahme der Bewitterungskammer ab.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
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