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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 44 (1993), S. 449-453 
    ISSN: 0947-5117
    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: Metastable iron-manganese alloys - new weld materials used in valve manufactureThe application of protective claddings by weld surfacing is the only possibility of effectively and economically increasing the reliability and service life of components subject to wear. In the case of exposure to adhesive and abrasive wear under high surface contact force, such as that which occurs in the sealing surface area of valves, newly developed austenitic iron-manganese weld surfacing alloys can be substituted for iron-chromium-nickel materials, as well as copper-, nickel-, and cobalt-based materials hitherto employed. These economical materials, which exhibit good working properties from a welding engineering standpoint, form an optimal load-bearing edge layer under load because of a metastable state; this layer is constantly reproduced during exposure to wear. Frictional and wear characteristics, surface structure, and corrosion resistance, as well as the closely associated service life, thus in part considerably exceed that of conventional materials.
    Notes: Das Auftragschweißen von Schutzschichten ist häufig die einzige Möglichkeit, die Zuverlässigkeit und Lebensdauer von verschleißbeanspruchten Bauteilen mit geringen Kosten wesentlich zu erhöhen. Für Beanspruchungen adhäsiven und abrasiven Verschleißes unter höchsten Flächenpressungen, wie sie z. B. im Dichtflächenbereich von Armaturen auftreten, können neu entwickelte austenitische Eisen-Manganlegierungen bisher verwendete Eisen-Chrom-Nickel-Werkstoffe sowie Kupfer-, Nickel- und Kobaltbasiswerkstoffe gut substituieren. Diese preisgünstigen, auch schweißtechnisch gut verarbeitbaren Werkstoffe bilden aufgrund eines metastabilen Zustandes unter Belastung einen optimal beanspruchungsgerechten Randschichtaufbau aus, der sich bei Verschleiß ständig reproduziert. Reibungs- und Verschleißverhalten, Oberflächenausbildung und Korrosionsbeständigkeit und die damit primär beeinflußte Standzeit übertreffen dadurch die der konventionellen Werkstoffe teilweise erheblich.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Bioelectromagnetics 15 (1994), S. 427-437 
    ISSN: 0197-8462
    Keywords: electric field exposure ; electromagnetic fields ; pineal function ; Life and Medical Sciences ; Occupational Health and Environmental Toxicology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: Sprague-Dawley male rats, maintained in a 14:10 h light:dark cycl were exposed for 30 days (starting at 56 days of age) to a 65 kV/m, 60 Hz electric field or to a sham field for 20 h/day beginning at dark onset. Pineal N-acetyltransferase (NAT), hydroxy-indole-o-methyl transferase (HIOMT), and melatonin as well as serum melatonin were assayed. Preliminary data on unexposed animals indicated that samples obtained 4 h into the dark period would reveal either a phase delay or depression in circadian melatonin synthesis and secretion. Exposure to electric fields for 30 days did not alter the expected nighttime increase in pineal NAT, HIOMT, or melatonin. Serum melatonin levels were also increased at night, but the electric field-exposed animals had lower levels than the sham-exposed animals. Concurrent exposure to red light and the electric field or exposure to the electric field at a different time of the day-night period did not reduce melatonin synthesis. These data do not support the hypothesis that chronic electric field exposure reduces pineal melatonin synthesis in young adult male rats. However, serum melatonin levels were reduced by electric field exposure, suggesting the possibility that degradation or tissue uptake of melatonin is stimulated by exposure to electric fields. © 1994 Wiley-Liss, Inc.
    Additional Material: 2 Ill.
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  • 3
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The Harderian gland blood supply of female and male hamsters was studied using light and electron microscopy. A profuse vascularization surrounding secretory acini was observed. Among the blood vessels, the existence of large and irregular sinusoidal capillaries was apparent. These sinusoids appeared in close association to the basal aspect of the secretory cells. Typical, small, fenestrated capillaries were also observed within the connective tissue. The existence of this particular vascularization together with other morphological features of the secretory cell basal pole suggest a possible endocrine function of these orbital glands.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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