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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Physics and chemistry of minerals 5 (1979), S. 21-31 
    ISSN: 1432-2021
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: Abstract The elastic properties of polycrystalline as well as single crystal MgO have been measured extensively. New measurements on four hot-pressed magnesium oxide samples are presented and compared to existing data. Discrepancies are noted between the properties determined for the different polycrystalline MgO samples; the magnitude of these differences is as much as ±6% for the reported bulk modulus. X-ray and electron microscopy techniques were applied to the four hot-pressed specimens and revealed the presence of residual strains, plastic deformation and a preferred orientation of grains with respect to hot pressing directions. Scanning electron micrographs also indicated that a non-homogeneous pore distribution existed. The results suggest that the data obtained from polycrystalline materials may not truly reflect the intrinsic elasticity of the material but rather some combination of the elasticity of the material and the state of aggregation of the polycrystal.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Pure and applied geophysics 141 (1993), S. 209-209 
    ISSN: 1420-9136
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Pure and applied geophysics 141 (1993), S. 249-268 
    ISSN: 1420-9136
    Schlagwort(e): Exploration tool ; physical properties ; core characterization
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract We will describe a new laboratory system which was designed to be highly automated and portable while maintaining quality. Driving this design was the recognition of the temporal dependence of physical properties. It becomes apparent that some sedimentary rocks, particularly shales, degrade and disaggregare so completely that mechanical or elastic properties cannot be measured. This temporal dependence displays a time scale much shorter than normal weathering but greater than the time for stress relief. A system was designed to permit field characterization of freshly recovered core material. A benefit of automation and portability is a marked increase in measurement efficiency. The attributes of this system permit rapid characterization of a large number of fresh cores in remote, frontier exploration areas. This feature can significantly reduce prospect evaluation time. Statistically significant rock property databases can be created in a short period of time.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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