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  • 1
    Electronic Resource
    Electronic Resource
    Periodicities in natural remanent magnetization and palaeoclimatic records detected by walsh spectra (1990)
    Springer
    Pure and applied geophysics 132 (1990), S. 757-769 
    Details
    ISSN: 1420-9136
    Keywords: Walsh spectra ; natural remanent magnetization ; palaeoclimate ; orbital cycles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The time series consisting of nonsinusoidal Natural Remanent Magnetization (NRM) and palaeoclimatic variations for the past two million years have been spectrally examined by using a new Walsh transform technique. The results show statistically significant periodicities (at 95% confidence level) of approximately 92,000 years; 43,000 years and 21,000 years in the ensemble spectra of the NRM intensity (mineralogic) variations. These NRM periodicities are remarkably close to the well-known Milankovitch cycles. The ensemble spectra of palaeoclimatic records reveal only 41,000 years statistically significant (95%) periodicity corresponding to the obliquity cycle. The study suggests that NRM variations in deep sea sediments probably are more sensitive recorders of “palaeoclimatic memory” than the oxygen isotope variations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00876818
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of grain size on the oxidation resistance of 2 4 1 Cr-1Mo steel (1992)
    Springer
    Oxidation of metals 37 (1992), S. 1-12 
    Details
    ISSN: 1573-4889
    Keywords: ferritic steel ; grain size ; oxidation resistance ; 2 4 1 Cr-1Mo steel ; annealing ; acoustic emission
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The effect of grain size on the oxidation of a 2 4 1 Cr-1Mo steel has been studied at 823 K in air. The oxidation rate was found to decrease with increasing grain size (varied form 16 to 59 μm). The decrease in oxidation rate with increasing grain size is attributed to the smaller grain-boundary area which results in a decrease in the short-circuit-diffusion paths. The enhancement in the oxidation rate with decreasing grain size has been confirmed further by acoustic emission (AE) tests which show more AE activity for smaller-grain-size specimens during oxidation as well as during cooling following the oxidation, indicating a faster oxidation rate and thicker scale, leading to more cracking and spailing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00665627
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