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  • Polymer and Materials Science  (4)
  • Biochemistry and Biotechnology
  • Organic Chemistry
  • 1965-1969  (5)
  • 1
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Knowledge of the characteristics of the blood-intima interface is important because it leads to information concerning (a) the normal antithrombotic mechanism (b) nature of interreactions between blood and intima (c) testing and selection of vascular wall substitutes which are antithrombotic and inhibit clotting. A technique for obtaining the electrical interfacial characteristics of blood vessel walls is by measuring streaming potentials. Experiments described in the present work are extensions of original in vivo streaming potential measurements. In vitro streaming potentials were measured across fresh canine aortae and carotid arteries using Krebs saline serum substitute, logarithmically varying both internal and external electrolyte concentrations. Positive streaming potentials were measured indicating that the blood vessel wall is negatively charged. Streaming potentials increased linearly with increasing flow rate, decreased with increasing internal electrolyte concentration, decreased with increasing external electrolyte concentration, and reversed, becoming positive, with aging of exteriorized artery. Thus the electrical characteristics of the blood vessel wall are dependent on an ionic balance between the blood vessel wall, flowing blood stream, and external environment. The information demonstrates the importance of electrochemical and physicochemical phenomena in the structure and function of the vascular interface and helps explain in vivo conditions conducive to or inhibitory of intravascular thrombosis.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 22-27 
    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: Testing of, and experience with, corrosion protection through coating systems on silicon resin basis, with special reference to stresses caused by temperature fluctuations.The paper reports on the development of aluminium-pigmented silicon resin coatings which hace temperature endurance strength of at least 600°C and can be exposed to temperature fluctations from 600°C to 0°C without suffering damage. A special advantage of these systems consists in the use of the same recipe for primer and finishing coat and in the fact that the coating provides a complete corrosion protection even without stoving. The systems have been throughly tried out both in realistic tests, which are described in detail, and in actual practice. After more than one year's successful experience with the coating applied to the doors of the drying kilns of a brickworks, under strong exposure to drying gases containing SO2, these coatings are expected to have to life of at least five years.
    Notes: Es wird über die Entwickling von aluminiumpigmentierten Siliconharzanstrichen berichtet, die eine Dauertemperaturbeständigkeit von mindestens 600°C besitzen und dabei Temperaturwechselbeanspruchungen von 600°C bis 0°C ohne Schaden ausgesetzt werden können. Einbesonderer Vorteil der entwicklten Systeme besteht in der Verwendung der gleichen Rezeptur für Grundierung und Deckanstrich sowie darin, daß auch der nicht eingebrannte Anstrich bereits einen vollkommenen Korrosionsschutz bietet. Die Systeme wurden in praxisnahen Tests, die ausführlich geschildert werden, wie auch in der Praxis eingehend erprobt. Nach mehr als einjähriger Bewährung in einem praktischen Einsatz auf den Trockenkammertüren einer Ziegelei, wobei eine sehr starke Belastung durch SO2-haltige Trockengase gegeben ist, wird erwartet, daß diese Anstriche eine Lebensdauer von mindestens 5 Jahren Besitzen.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 19 (1968), S. 193-200 
    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: Corrosion-protected connecting devices. Recent developments. First StandardsWith connecting devices, manufacture and materials should be attuned to each other in order to attain optimum results. Through cold forming, higher yield limits can be reached which prevail even at temperatures up to 400° C and entail considerable savings in size.According to German Standards DIN 267, Sheet 11, the conventional specifications for the material alone are superseded by quality specifications. While meeting the minimum requirements to be guaranteed, the manufacturer is free to choose, from among the steels of the specified group, those steels which in conjunction with the manufacturing process produce the best results.Testing and acceptance conditions should be adapted to the application conditions. Previously standardized, conventional testing methods should be modified. The tensile test should be carried out on entire bolts; nuts subjected to the load test should be exposed to the rupture load corresponding to the quality of the bolts to which they are to be fitted. Practical experience and the results of calibration tests do not suggest that the corrosion strength of the connecting devices would be impaired by cold forming under such conditions. Appearance and corrosion resistance can be improved by electro-polishing. With nitrogen-alloyed austenitic chrome-nickel steels, the mechanical strength characteristics can be improved still further while the torrosion resistance remains at least as good.
    Notes: Fertigungsverfahren und Werkstoffe müssen bei Verbindungselementen wechselseitig aufeinander abgestimmt werden, um optimale Werte zu erreichen. Durch Kaltumformen werden höhere Streckgrenzenwerte erreicht, die auch bei Temperaturen bis 400° C erhalten bleiben und zu erheblichen Ersparnissen in der Dimensionierung führen.An die Stelle einer reinen Werkstoffvorschrift tritt nach DIN 267 Blatt 11 die Gütergruppe. Unter Beachtung zu gewährleistender Mindestwerte kann der Hersteller für die Fertigung wechselseitig aus der gleichen Stahlgruppe die am besten geeigneten Stähle auswählen.Prüf- und Abnahmebedingungen sind den Verhältnissen des Einsatzes anzupassen. Bisher genormte und übliche Prüfanordnungen müssen geändert werden. Der Zugversuch ist an ganzen Schrauben durchzuführen, Muttern sind im Prüflastversuch bis zur Bruchlast der mit ihr zu verschraubenden Schraubengüter zu belasten. Praktische Erfahrungen und Kontrollversuche ergaben keine Beeinträchtigung der Korrosionsbeständigkeit durch das Kaltformen für Verbindungselemente unter diesen unter diesen Bedingungen. Aussehen und Korrosionsbeständigkeit lassen durch Elektropolieren steigern. Mit stickstofflegierten austenitischen Chrom-Nickel-Stählen ist eine weitere Erhöhung der Festigkeiten bei mindestens gleicher Korrosionsbeständigkeit möglich.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die durch AlCl3 katalysierte Ketonhomologisierung mittels Diazomethans wird auf Spiroalkanone übertragen. Die Abhängigkeit der Reaktivität von der Größe des Cycloalkanonrings sowie von der Stellung der Carbonylgruppe zum Spiro-C-Atom wird untersucht. Die Ergebnisse werden im Hinblick auf die Richtung der Einschiebung der CH2-Gruppe diskutiert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 5 (1967), S. 2192-2198 
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: No. Abstract.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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