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  • American Institute of Physics (AIP)  (1)
  • Geological Society of London  (1)
  • 1
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    Pyritiferous mudstone-siltstone: expansion rate measurement and prediction (2015)
    Geological Society of London
    Details
    Publication Date: 2015-03-12
    Description: The expansion rates of a pyritiferous Irish mudstone–siltstone fill material have been measured over a period of 19 months in an apparatus devised to replicate underfloor conditions. The testing, performed in a temperature-controlled environment, has shown that both fill density and depth submerged in water have significant influences on the progress of the expansion. It appears that whereas thermal expansion or contraction has an effect on expansion rates immediately after a temperature change, there is no long-term temperature effect on the rate of expansion. In addition, an examination of chemical test results for 60 houses in a housing development in the Dublin area has confirmed that pyrite content is the dominant control over the degree of expansion. A molecular–molar analysis of the pyrite chemical process equations, in addition to a knowledge of the original pyrite content and rate of oxidation, has been used to give a lower-bound estimate of the amount of heave in the laboratory experiments.
    Print ISSN: 1470-9236
    Topics: Geosciences
    Published by Geological Society of London
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  • 2
    Electronic Resource
    Electronic Resource
    Molecular dynamics simulations of hydrocarbon chains (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 6190-6194 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Molecular dynamics methods are used to study the conformation of single model hydrocarbon chains in a monatomic Lennard-Jones fluid of methylene segments. Simulations of 7, 9, 11, 13, 15, 17, and 21 segment chains were made with 100–500 spheres. The forces of the skeletal chains involve intramolecular effects of bond vibration, angle bending, and rotation among quartets of adjacent segments. The average trans fraction of the hydrocarbon chains shows no significant effect of chain length, and the end-to-end distance and radius of gyration vary linearly with chain length.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458342
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