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61.
Vladimir Yu. Semenov Josef Pek Antal Ádám Waldemar Jóźwiak Boris Ladanyvskyy Igor M. Logvinov Pavel Pushkarev Jan Vozar 《Acta Geophysica》2008,56(4):957-981
In the years 2001–2003, we accomplished the experimental phase of the project CEMES by collecting long-period magnetotelluric
data at positions of eleven permanent geomagnetic observatories situated within few hundreds kilometers along the south-west
margin of the East European Craton. Five teams were engaged in estimating independently the magnetotelluric responses by using
different data processing procedures. The conductance distributions at the depths of the upper mantle have been derived individually
beneath each observatory. By averaging the individual cross-sections, we have designed the final model of the geoelectrical
structure of the upper mantle beneath the CEMES region. The results indicate systematic trends in the deep electrical structure
of the two European tectonic plates and give evidence that the electrical structure of the upper mantle differs between the
East European Craton and the Phanerozoic plate of west Europe, with a separating transition zone that generally coincides
with the Trans-European Suture Zone. 相似文献
62.
Differential sedimentation versus coring artifacts: a comparison of two widely used piston-coring methods 总被引:1,自引:0,他引:1
In order to compare two widely used piston-coring techniques, parallel cores were taken with both a Kullenberg and a Livingstone corer in the deepest part of Soppensee (25 m), a small eutrophic Swiss lake containing varved sediments. The cores were taken within a horizontal distance of 3 m and yield comparable stratigraphic records. Differences in millimetre-scale microstructure are attributed to primary sedimentation processes at the water/sediment interface. Sediment thin-sections, as well as sediment x-radiograph investigations, reveal no difference in microstructure that could unequivocally be attributed to one of the coring methods used. The differences in deposition are therefore thought to reflect the inherent variability of lacustrine sedimentation in Soppensee.Major differences in overall core recovery do occur, however, in organic-rich, highly porous sediments. These variations are primarily attributed to differential gas expansion. Actual sediment-accumulation rates can therefore only be correctly estimated if the sedimentary record can be constrained within a high-resolution temporal framework, e.g. by annual laminations. 相似文献
63.
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65.
Josef Ryšavý 《Studia Geophysica et Geodaetica》1960,4(2):119-129
Sans résumé
En collaboration avec les membres de la rédaction: prof. Ing. Ján Krajčí, Dr. Ing. Karel Kučera et Dr. Ing. Jan Kašpar.
Adresse: Národní tř. 3, Praha 1. 相似文献
66.
Dr. Josef Hanselmayer 《Contributions to Mineralogy and Petrology》1951,2(6):492-497
Ohne Zusammenfassung 相似文献
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There is a growing interest in investigating the accuracy of digital elevation model (DEM). However people usually have an unbalanced view on DEM errors. They emphasize DEM sampling errors, but ignore the impact of DEM resolution and terrain roughness on the accuracy of terrain representation. This research puts forward the concept of DEM terrain representation error (Et) and then investigates the generation, factors, measurement and simulation of DEM terrain representation errors. A multi-resolution and multi-relief comparative approach is used as the major methodology in this research. The experiment reveals a quantitative relationship between the error and the variation of resolution and terrain roughness at a global level. Root mean square error (RMS Et) is regressed against surface profile curvature (V) and DEM resolution (R) at 10 resolution levels. It is found that the RMS Et may be expressed as RMS Et = (0.0061 × V+ 0.0052) × R - 0.022 × V + 0.2415. This result may be very useful in forecasting DEM accuracy, as well as in determining the DEM resolution related to the accuracy requirement of particular application. 相似文献
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Zusammenfassung Einige Probleme der Kristallchemie besonders mineralogisch wichtiger Granate werden behandelt. Für den röntgenographischen Befund, daß die SiO4-Tetraeder zu einem etwas gestreckten tetragonalen Disphenoid verzerrt sind, wir eine Erklärung gegeben. Die Stabilitätsverhältnisse der verschiedenen Granate werden vom Standpunkt der Kristallchemie unter wesentlicher Benützung der Wirkungsradien der Gitterbestandteile diskutiert. 相似文献