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  • Electronic Resource  (2)
  • 1970-1974  (2)
  • 1960-1964
  • 1905-1909
  • 1970  (2)
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  • Electronic Resource  (2)
Years
  • 1970-1974  (2)
  • 1960-1964
  • 1905-1909
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  • 1
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Summary The stability-theory of helical flows in the narrow gap between coaxial cylinders is extented to the hydromagnetic case. The inviscid fluid is supposed to be ideally conducting and is influenced by an axial magnetic field. The investigation of the stability leads to an eigenvalue-problem of a linear differential-equation of second order, which can be solved analytically only for special disturbances. For arbitrary disturbances numerical methods are required. The results show that in the presence of a magnetic field weak instabilities always exist.
    Notes: Übersicht Es wird die Theorie der Stabilität spiraliger Strömungen im schmalen zylindrischen Ringraum auf den hydromagnetischen Fall erweitert. D. h. die reibungsfreie Flüssigkeit wird zusätzlich als elektrisch unendlich leitfähig vorausgesetzt und steht unter der Wirkung eines axialen Magnetfeldes. Die Stabilitätsuntersuchung führt auf ein Eigenwertproblem einer linearen Differentialgleichung zweiter Ordnung. Dieses Problem kann nur für spezielle Störungen analytisch gelöst werden. Für allgemeine Störungen müssen die Eigenwerte numerisch bestimmt werden. Die Rechnung ergibt, daß in Anwesenheit eines Magnetfeldes immer schwach angefachte Störungen auftreten.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2-Chloromethylbutadiene has been converted to quaternary ammonium and sulfonium monomers which have been polymerized at room temperature. They show a very great tendency to dimerize on heating in water solution. The aqueous quaternary monomer dimerized 25 times as fast as the aqueous sulfonium monomer and nearly 105 times as fast as neat isoprene at 50°C. The quaternary monomer dimerized with itself in a water solution to which 2-hydroxymethylbutadiene has been added as an example of a nonionic diene. The latter monomer did not dimerize rapidly in water, nor did 2-aminomethylbutadiene. The hydrochlorides of 2-aminomethylbutadiene and 2-dimethylaminomethylbutadiene dimerized at rates comparable to that of the sulfonium monomer. Poly 2-chloromethylbutadiene contains reactive chlorine except for the structure resulting from the minor extent of 1,2 addition. Water-soluble derivatives have been made from it with nucleophilic tertiary amines and sulfides. Cationic polymers are substantive to paper pulp, and the sulfonium polymers can be cured in paper to give improved wet strength.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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