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  • 1
    Electronic Resource
    Electronic Resource
    A falling head permeameter for the measurement of the hydraulic conductivity of granular solids (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 3942-3946 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A falling head permeameter is described in which pairs of infrared emitters and detectors on a sight tube are used to measure the flow rate associated with the passage of water through a granular solid under the action of a diminishing pressure head. An equation relating pressure head to elapsed time is derived from which permeability may be calculated. In order to verify the accuracy and sensitivity of the instrument, permeability measurements carried out on a graded quartz sand are compared to those obtained by the more conventional constant head measurement. Excellent agreement is obtained between the permeability values obtained using both measurement methods. Experimental results are also reported for the measurement of the permeability of a range of sieved sand fractions. The falling head permeameter described here is particularly suitable for the measurement of the hydraulic conductivity of granular solids such as sands and soils through which a high flow rate may be expected. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1310349
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  • 2
    Electronic Resource
    Electronic Resource
    Palaeoecological evidence for early aragonite dissolution in ancient calcite seas (1988)
    [s.l.] : Nature Publishing Group
    Nature 335 (1988), S. 809-810 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The current orthodoxy that shallow carbonate seas have precipitated different carbonate minerals at different times during the past 600 Myr has developed from the study of ooliths1'3. Modern shallow-marine ooliths are predominantly aragonite and show textures (principally the lack of a radial ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/335809a0
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  • 3
    Electronic Resource
    Electronic Resource
    Inferred oxygen isotope profile of Archaean oceanic crust, Onverwacht Group, South Africa (1986)
    [s.l.] : Nature Publishing Group
    Nature 321 (1986), S. 55-58 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Barberton Mountain Land is one of the oldest surviving Archaean greenstone belts. Whole-rock Sm-Nd measurements have given the oldest ages: 3.540.03Gyr (ref. 1) and 3.56 0.24 Gyr (ref. 2). Other isotopic systems have given ages clustered about 3.3 Gyr (refs 3-8). The rocks of the greenstone ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/321055a0
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