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  • ACOUSTICS  (1)
  • General Chemistry  (1)
  • 5'-O-demethyl-8-O-methyl-7-epi-dioncophylline A
  • 550 - Earth sciences
  • Exobiology
  • enthalpy
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  • 1980-1984  (1)
  • 1950-1954  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 64 (1952), S. 187-195 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Microanalytical Problems in Metallography and MetallurgyMicroanalysis has become increasingly important in metallographic analyses during recent years. This paper shows the particular problems with reference to the investigation of the structure of iron and steel. It has been possible to determine important new information concerning carbide and oxide occlusions, as well as those of nitrides, sulphides and intermetallic compounds. Particular attention is paid to the problems arising in taking the samples.
    Notes: Die Mikroanalyse hat in den letzten Jahren für die metallkundliche Analyse sehr an Bedeutung gewonnen. Es wird hier gezeigt, welche Aufgaben ihr besonders bei der Gefügeforschung an Stahl und Eisen gestellt werden. Es ist gelungen, wesentliche neue Erkenntnisse über Carbide und oxydische Einschlüsse und solche von Nitriden, Sulfiden und intermetallischen Verbindungen zu erhalten. Besondere Sorgfalt wird den bei den Probenahmen auftretenden Problemen gewidmet.
    Additional Material: 20 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2019-07-13
    Description: Sound attenuation in a rectangular acoustically lined duct containing uniform mean flow is analytically investigated using the generalized Wiener-Hopf technique. Uniqueness of the solution is enforced for lined sections of the finite axial extent by imposing edge conditions at the liner interface. Possible edge conditions are considered, including the Kutta condition, and the causal solution corresponding to edge conditions is considered the best choice. Solution methods such as the mode matching and singularity methods imply differing edge conditions, and results show that power attenuation is insensitive to the imposed edge conditions, although significant differences are observed for the reflection coefficient. The amplitude of the exponentially increasing instability mode in the lined section must be set to zero as a first approximation to the nonlinear situation, and results indicate that measurements of the reflection factor can be used to make a more definite decision about physically appropriate edge conditions.
    Keywords: ACOUSTICS
    Type: AIAA PAPER 81-2017 , Aeroacoustics Conference; Oct 05, 1981 - Oct 07, 1981; Palo Alto, CA
    Format: text
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