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  • 1
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung  In einem Experimentierprogramm wurde die Erhöhung des Wärmeübergangs beim Behältersieden in einer Wasserschicht über einer beheizten, horizontalen Edelstahlplatte durch Aufrauhen und/oder Abdecken der Oberfläche mittels eines einschichtigen Edelstahlnetzes untersucht. Die Darstellung der Ergebnisse erfolgt in Form von Siedekurven. Die Einflüsse verschiedener Parameter, wie Oberflächenrauhigkeit, Dicke der Füssigkeitsschicht und Maschenweite des Edelstahlnetzes auf den Wärmeübergang beim Sieden wurden eingehend untersucht. Die Meßdaten belegen eindeutig, daß eine Verringerung der Wasserschichtdicke von 60 auf 5 mm den Wärmeübergang verschlechtert, während Aufrauhen der Oberfläche diesen wesentlich erhöht. Bei geringer Höhe der Wasserschicht und Abdeckung der Heizfläche mittels eines Metallnetzes mit Maschenweiten von der Größe des Blasenabreißdurchmessers erhöhte sich der Wärmeübergang ebenfalls stark, er verringerte sich jedoch bei Netzabdeckung der rauhen Oberfläche.
    Notes: Abstract  An experimental investigation was carried out to study the augmentation of heat transfer in saturated pool boiling of a liquid water layer on a heated horizontal stainless steel plate by roughing the surface and/or covering it with a single layer of stainless steel screen. The results were presented in terms of the boiling curves. Effects of various parameters – the surface roughness, liquid level and size of the stainless steel mesh on the boiling heat transfer were examined in detail. The measured data clearly indicated that a lowering of the liquid level from 60 to 5 mm in water depth causes heat transfer reduction. Roughing the surface was found to sig- nificantly enhance the heat transfer. Use a layer of metal screen to cover the heated surface was shown to substantially augment the heat transfer especially for a shallow water layer if the mesh size is comparable with the bubble departure diameter. Covering the rough surface with the metal mesh, however, reduced the heat transfer.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-203X
    Keywords: Key words Genetic transformation ; Agrobacterium ; Eucalyptus ; Regeneration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An efficient system for Agrobacterium-mediated transformation of Eucalyptus camaldulensis and production of transgenic plants was developed. Transformation was accomplished by cocultivation of hypocotyl segments with Agrobacterium tumefaciens containing a binary Ti-plasmid vector harboring chimeric neomycin phosphotransferase and β-glucuronidase (GUS) genes. A modified Gamborg's B5 medium used in this study was effective for both callus induction and regeneration of transgenic shoots. This medium could also effectively maintain the organogenic capability of callus for more than a year. Culturing transgenic shoots in Murashige and Skoog medium supplemented with 0.1 mg ⋅ l–1 benzylaminopurine prior to root induction in rooting medium markedly increased the rootability of shoots that were recalcitrant to rooting. Histochemical assay revealed the expression of the GUS gene in leaf, stem, and root tissues of transgenic plants. Insertion of the GUS gene in the nuclear genome of transgenic plants was verified by genomic Southern hybridization analysis, further confirming the integration and expression of T-DNA in these plants.
    Type of Medium: Electronic Resource
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