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  • 11
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 78 (1956), S. 4896-4900 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 129 (1989), S. 295-307 
    ISSN: 1420-9136
    Keywords: Large mine tremors ; source parameters ; ground motion parameters ; Klerksdorp mining district ; Carletonville mining district
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract An investigation of ground motion, recorded using broad-band, wide dynamic-range digital seismographs, of large mine tremors from two South African mining districts with different geologic settings, reveals some essential differences in both seismic source and ground motion parameters. In the Klerksdorp district where the strata are offset by major throughgoing normal faults, the largest tremors, with magnitudes ranging as high as 5.2, tend to be associated with slip on these pre-existing faults. Moreover, the seismic source and ground motion parameters are quite similar to those of natural crustal earthquakes. In the Carletonville district, by contrast, where substantial faults do not exist, the large-magnitude tremors appear to result from the failure of relatively intact rock and cause seismic stress drops and ground motion parameters higher than normally observed for natural shocks. Additionally, there appears to be an upper magnitude limit of about 4 in the Carletonville district. Detailed analyses of an exceptionally large event recorded locally from each of these districts serve to highlight these contrasts.
    Type of Medium: Electronic Resource
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  • 13
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 129 (1989), S. 497-511 
    ISSN: 1420-9136
    Keywords: Seismic coda ; quality factorQ ; localized scatterers ; fractured rock ; stope environment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A single scattering model was used to analyse the temporary changes in the mean density of scattered waves in a discrete random medium. The model of the mean energy density, originally proposed bySato (1977) for spherical radiation and isotropic scattering, has been modified and applied to a medium in which the scatterers are confined to a specified volume. The time variation of the early part of the mean energy density function for the different source durations was investigated. The dominant effect on the theoretical mean energy density is caused by the specified volume containing scatterers. The duration of the source pulse influences the early part of the coda fort/t 0〈1.2, wheret is the lapse time measured from the source origin time, andt 0is arrival time of the body wave. The analysis of the coda signal of micro-events occurring immediately in front of the face enables us to estimate the size of the fracture zone induced by the stope. The model of the mean energy density of coda for a medium containing scatterers close to the seismic source was used to analyse a large number of events recorded close to an advancing mine face in a deep level gold mine in South Africa. The coda decay rate has two trends: the first, with a steep decay of coda, is produced by a larger deviation of rock parameters and/or larger size of the scatterers; the second trend, which decays more slowly, has the corresponding mean-free path ranging from 20 m to 200 m. The analysis indicates that the rock mass about 15–20 m from the stope contains a large proportion of fractured and blocked rock, which is the source of scattering. The scattering of theS-wave was much stronger and more stable, with the mean-free path varying from 11 m to 45 m. This is due to the shorter wavelength of theS wave in comparison with theP wave. The quality factor for theP coda wave varies from 30 to 100 in the fracture zone of stope and outside this zone it has a value of 300. The quality factor of theS wave varies from 20 to 78 in the equivalent volume. For rock surrounding the stope the ratioQ sp −1 /Q ss −1 varied from 0.31 to 0.69. This suggests that the radii of scatterers are smaller than 3.5 m.
    Type of Medium: Electronic Resource
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  • 14
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 35 (1956), S. 49-53 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Numerical results are given which show the way in which thc Curie temperature moves inwards from the margin during the cooling of a thick intrusive sheet. The time taken to move from the margin to the centre varies as the square of the thickness of the sheet, being about 6500 years for a sheet 1000 m thick on reasonable assumptions as to the thermal properties of the material. This implies that the secular variation of the Earth's magnetic field over periods of time of 1000 years or more may be studied by measuring the directions of magnetisation at a series of points across the thickness of such a sheet. Some measurements on a Tasmanian sill about 430 m thick of Jurassic or Cretaceous age suggest a change from maximum to minimum inclination in a time of about 200 years. Since the margins of the sill are not available this figure may be considerably in error but the results suggest the general practicability of the method.
    Type of Medium: Electronic Resource
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  • 15
    Electronic Resource
    Electronic Resource
    Springer
    Mineralium deposita 31 (1996), S. 250-252 
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Type of Medium: Electronic Resource
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  • 16
    ISSN: 1432-072X
    Keywords: Bacillus subtilis ; Phage ; Receptor ; Teichoic acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Efficient adsorption of bacteriophages SP 50 and Φ 25 occurred only to bacilli that contained wall teichoic acid and neither phage bound to phosphate limited bacilli that contained teichuronic acid instead of teichoic acid. Though both phages require the presence of teichoic acid, their receptors are not identical. Efficient binding of phage Φ 25 required the presence of greater proportions of teichoic acid in the wall and the receptor for this phage was destroyed when bacteria or isolated walls were heated at pH 4 whereas the ability of these samples to bind phage SP 50 was unaffected by such treatment. Efficient binding of phage SP 50 was not highly dependant on the presence of glucosyl substituents on the teichoic acid. Such substituents were required for phage Φ 25 binding though their anomeric configuration appeared to be unimportant since the phages bound well to both strains W23 and 168, the wall teichoic acids of which carry glucosyl substituents of opposite anomeric configuration. The differeneces in the nature of the receptors may be of value in the use of the phages as probes for the location and distribution of teichoic acid in the wall.
    Type of Medium: Electronic Resource
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  • 17
    Electronic Resource
    Electronic Resource
    Springer
    European journal of clinical pharmacology 10 (1976), S. 245-250 
    ISSN: 1432-1041
    Keywords: Tetracyclines ; half life ; volume of distribution ; renal clearance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The disposition of minocycline, tetracycline, doxycycline and oxytetracycline was investigated in four male volunteers after multiple dosing. Values for half life, renal clearance and volume of distribution were calculated and corrected for plasma protein binding. Tetracycline and oxytetracycline have a much larger volume of distribution than minocycline and doxycycline but similar half lives. They give higher tissue levels for equivalent plasma levels. Since their cost per unit dose is much lower they should be the tetracyclines of first choice.
    Type of Medium: Electronic Resource
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  • 18
    Electronic Resource
    Electronic Resource
    Bradford : Emerald
    Disaster prevention and management 4 (1995), S. 38-44 
    ISSN: 0965-3562
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Technology
    Notes: In Britain in 1945, the politics of peace steered reconstructiontowards a static socio-economic base from which stemmed many laterplanning and social problems. Britain had emerged from six years of wareconomically weakened but with a clear social vision, an effectiveadministration and fully evolved plans for the transition from war topeace. The social vision including the ideal of full employment and theright to a local job and a local home. This placed the economy in aspatial stranglehold and denied it the flexibility needed to adapt tochanging global conditions. Draws on the British experience to suggestthat the understandable desire to replace in situ what has beendestroyed is doomed to fail and can prejudice the ability of futuregenerations to meet their own needs.
    Type of Medium: Electronic Resource
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  • 19
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 59 (1955), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 20
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 197 (1963), S. 475-476 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The antenna system was a filled-in array 4,000 ft. east-west by 1,000 ft. north-south. It was connected to receivers in which the signals were added in six independent phase arrangements in such a way that the intensity of the cosmic noise at six declinations could be recorded simultaneously. The ...
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