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  • 1
    Electronic Resource
    Electronic Resource
    Non-destructive porosity determinations of antarctic marine sediments derived from resistivity measurements with an inductive method (1993)
    Springer
    Marine geophysical researches 15 (1993), S. 201-218 
    Details
    ISSN: 1573-0581
    Keywords: porosity ; electrical resistivity ; non-destructive inductive method ; sea floor sediments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The fractional porosity of marine sediments is one of the fundamental index properties of rocks. For the determination of porosity a nondestructive, inductive method was used on unsplit sediment cores. The results were compared with galvanically measured resistivities using a miniature Wenner array on split cores. The measurements agree well except for cores with high clay content where measurement frequency related effects cause a resistivity difference of about 10%. Porosities were derived from resistivities using a published resistivity-porosity relationship by Boyce (1968) and compared with sample porosities. A comparison of both data sets shows good agreement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01204233
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Drift tube investigations on the reactions of O 2 + with CH4 and of CO 2 + with NO in various buffer gases (1981)
    Springer
    Plasma chemistry and plasma processing 1 (1981), S. 65-71 
    Details
    ISSN: 1572-8986
    Keywords: Drift tube ; rate coefficients ; internal excitation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract The influence of internal excitation on the reactions of O 2 + + CH4 and of CO 2 + + NO has been investigated using a slow flow drift tube. The rate coefficients for these reactions obtained as a function of relative kinetic energy in various buffer gases like He, Ne, Ar, and Kr showed higher values under conditions where the internal excitation of the reactant ions was enhanced. For both reactions the lowest reactivity at all kinetic energies was observed to occur in He, indicating that He is the least effective buffer for collisionally inducing internal excitation of molecular ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566376
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    Paper (German National Licenses)
    Fulltext
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