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  • Articles  (37)
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  • 1
    Electronic Resource
    Electronic Resource
    Precision Intercomparisons of Lead Isotope Ratios : Broken Hill and Mount Isa (1960)
    [s.l.] : Nature Publishing Group
    Nature 187 (1960), S. 754-756 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] VARIATIONS in the isotope ratios of lead as observed in Nature are being used to a steadily increasing extent for such problems as determining the mode of emplacement of sulphide ore bodies, estimating the absolute ages of deposition of certain mineral deposits and as a means of obtaining ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/187754a0
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  • 2
    Electronic Resource
    Electronic Resource
    Discordant Lead–Uranium Ages due to Continuous Loss of Lead (1963)
    [s.l.] : Nature Publishing Group
    Nature 200 (1963), S. 561-562 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The interpretations which have been offered co far fall into two categories. Episodic loss of lead (or gain of parent uranium) has been considered by Wetherill3,4, who showed that a linear discordant lead-uranium age pattern on a 206Pb/238U versus 207pb/235U diagram may be explained by a single ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/200561a0
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  • 3
    Electronic Resource
    Electronic Resource
    MINIMUM ENTROPY DECONVOLUTION WITH AN EXPONENTIAL TRANSFORMATION (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 27 (1979), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The Minimum Entropy Deconvolution (MED) technique of Wiggins (1977) represents a breakthrough in deconvolution and will undoubtedly find wide application in many fields. MED does not require any phase assumptions about the disturbing function and seeks a deconvolved output which consists of the smallest number of large spikes consistent with the input data.The efficiency of MED is much improved when an exponential transformation is incorporated into the algorithm. This is particularly true when the input traces contain additive noise. In this case the noise suppression characteristics of MED are considerably enhanced by the transformation and the identification of smaller spikes is improved. This paper also presents a kurtosis criterion of simplicity rather than the varimax norm introduced by Wiggins. It appears that for a multiple trace input the kurtosis measure leads to improved results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1979.tb00979.x
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  • 4
    Electronic Resource
    Electronic Resource
    THE OLD AND THE NEW IN SEISMIC DECONVOLUTION AND WAVELET ESTIMATION (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 25 (1977), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Various seismic deconvolution operators can be determined by estimating a seismic wavelet and subsequently designing an appropriate inverse filter which converts the wavelet to a spike. Seismic wavelets and deconvolution operators must be estimated in a time adaptive sense due to the nonstationarity of the seismic trace. The wavelet estimation methods considered in this paper either use the assumption of a minimum phase wavelet and a random impulse response, or the assumption that the wavelet cepstrum is readily separable from the cepstrum of the seismic trace. The former assumption is required in using the Hilbert transform and Wiener-Levinson wavelet estimations, while the latter assumption is used in homomorphic deconvolution. These wavelet estimates can be used in the design of multichannel Wiener and Kalman deconvolution operators. Multichannel usage of homomorphic deconvolution can also be implemented through various types of cepstral stacking.The discussion of deconvolution filter design focuses on the problems of filter length, degree of prewhitening, and nonstationarity. In designing time adaptive deconvolution filters, the autocorrelation function can be used to monitor the nonstationarity of the seismic trace. The autocorrelation function, which is used in the computation of least squares inverse filters, can be estimated in an optimum fashion by using the maximum entropy method. Differences between minimum phase Wiener deconvolution and maximum entropy deconvolution become more pronounced for shorter data gates. As a result, the maximum entropy approach is preferred for time adaptive deconvolution.In this paper, the performance of various wavelet estimators and inverse filters is discussed using real and synthetic seismic data. Discussions of homomorphic deconvolution and maximum entropy prediction error filtering are merged with descriptions of conventional approaches to deconvolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1977.tb01185.x
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  • 5
    Electronic Resource
    Electronic Resource
    A NEW APPROACH FOR DERIVING PSEUDOVELOCITY LOGS FROM RESISTIVITY LOGS (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 36 (1988), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: This paper describes a method of generating pseudovelocity logs using measurements of electrical resistivity. A theoretical relation between electrical resistivity and transit time, which is applicable to a wide range of lithologies, has been developed. The application of this relation using a method which defines lithoresistivity zones as lithological intervals related to the same formation and showing small resistivity variations, has been tested in the Recôncavo sedimentary basin in Bahia, Brazil. A comparison of derived pseudovelocity logs with actual sonic logs for five wells whows the validity of the present approach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1988.tb02151.x
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  • 6
    Electronic Resource
    Electronic Resource
    Lead Isotopes, Lunar Capture and Mantle Evolution (1969)
    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 766-768 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Lead isotope data from young mantle derived volcanics suggest that the mantle is a two-stage system. The second stage was formed at the time of the global Anorthosite Event, and both events may have been caused by the capture of the Moon by the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/224766a0
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  • 7
    Electronic Resource
    Electronic Resource
    L-moments and C-moments (2000)
    Springer
    Stochastic environmental research and risk assessment 14 (2000), S. 50-68 
    Details
    ISSN: 1436-3259
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract  It is well known that the computation of higher order statistics, like skewness and kurtosis, (which we call C-moments) is very dependent on sample size and is highly susceptible to the presence of outliers. To obviate these difficulties, Hosking (1990) has introduced related statistics called L-moments. We have investigated the relationship of these two measures in a number of different ways. Firstly, we show that probability density functions (pdf ) that are estimated from L-moments are superior estimates to those obtained using C-moments and the principle of maximum entropy. C-moments computed from these pdf's are not however, contrary to what one may have expected, better estimates than those estimated from sample statistics. L-moment derived distributions for field data examples appear to be more consistent sample to sample than pdf 's determined by conventional means. Our observations and conclusions have a significant impact on the use of the conventional maximum entropy procedure which typically uses C-moments from actual data sets to infer probabilities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004770050004
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  • 8
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    L-moments and C-moments (2000)
    Springer
    Details
    Publication Date: 2000-01-01
    Print ISSN: 1436-3240
    Electronic ISSN: 1436-3259
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Published by Springer
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  • 9
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    L-moments and C-moments (2000)
    Springer
    Details
    Publication Date: 2000-03-09
    Print ISSN: 1436-3240
    Electronic ISSN: 1436-3259
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Published by Springer
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  • 10
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    On the light curve of 3C 273 (1975)
    Institute of Physics
    Details
    Publication Date: 1975-10-01
    Print ISSN: 0004-637X
    Electronic ISSN: 1538-4357
    Topics: Physics
    Published by Institute of Physics
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