Even magnitudes <6.0 can be successfully observed under favourable noise conditions. 9 71069 Sindelfingen Deutschland Tel. We infer the seismic thickness from a waveform tomographic model of S-wave speed, and as a proxy for the elastic thickness we use the wavelength at which the coherence of surface topography and Bouguer gravity drops below half of its long-wavelength maximum. Eingetragener Verein mit den satzungsmäßigen Voraussetzungen zur Gemeinnützigkeit Josef-Lanner-Str. 1529Ībstract: We present constraints on the regional variations of the seismic and mechanical thickness of the Australian lithosphere. Simons and van der Hilst, R.D.Īge-dependent seismic thickness and mechanical strength of the Australian lithosphere No attempt was made to translate the linear attenuation coefficient to the physical bulk density of the different constituents of coal (e.g. We therefore suggest that the linear attenuation coefficient be treated as a separate unit. The different energy range of the microfocal X-ray source compared to medical CT, however, produces some bias in the correlation of the tomodensities with the surface percentages of the constituents. A multivariate correlation was carried out, and two improved (geo)statistical methods are suggested. Second, CMT-tomograms were made, yielding spatial resolutions twice as high as medical CT. These data are subjected to a geostatistical analysis to quantify the spatial dependence between the measurements. First, new CIA-data on the surface composition along two profiles were sampled with greater detail (100 micron). For sake of comparison, the same core sample was used. In this paper, we use CMT-devices for a similar correlation. This analysis assumed the linear proportionality of the tomodensity with the real physical bulk density, which is true only for certain energy ranges. (1996) presented the results of the correlation of the tomodensities obtained from three-dimensional CT scans with two-dimensional data on the composition of a coal sample acquired with color image analysis (CIA), a camera technique. The linear attenuation coefficient or tomodensity is dependent on the physical density and the mineralogy of the object to be imaged, and on the energy of the radiation used. This enables a far better spatial resolution. In contrast to the more conventional medical computerized tomography (CT) systems, a microfocal X-ray source is used. 69-88Ībstract: Microfocal X-ray computed microtomography (CMT) is a novel technique that produces three-dimensional maps of the distribution of the linear attenuation coefficient inside an object. Quantitative characterization of coal by means of microfocal X-ray computed microtomography (CMT) and color image analysis (CIA)
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