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Browsing ELibrary by Title
Now showing items 14009-14028 of 22924
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(1996)The rate of thiosulfate oxidation to tetrathionate by dissolved molecular oxygen was measured in aqueous suspensions of synthetic sphalerites doped with first row transition metals (Mn, Fe, Co, Ni, Cu). Pure sphalerite and ...
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(1987)There are two hypotheses regarding thiosulfates in the Black Sea: a) that they are an intermediate product of the oxidation of hydrogen sulfide and b) that they are an intermediate product of the reduction of sulfates to ...
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(1989)The existing experimental studies of nonlinear seismic waves have concentrated on second-order effects. The thereby-detected anomalously large values of the second-order nonlinearity parameters of geophysical media resulting ...
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(2002)At the initial stage of genesis of precious opal from concentrated suspensions of monodisperse silica spheres, supramolecular gel crystals with solid silica particles form. The latter are localized at the lattice sites and ...
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(2003)Supracrustal rock in the northern part of the Late Archean Tikshozero greenstone belt were determined to be of predominantly volcanic nature. The geochemistry of major, trace, and rare-earth elements and the Nd and Sr ...
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(2004)A Th-rich mineral of the crandallite group has been investigated from the weathering profile of the Schugorsk bauxite deposit, Timan, Russia. It occurs within thin (up to 0.5 mm) organic-rich veinlets together with ‘leucoxene’ ...
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(2001)Two of the most important sources of information on the style of mantle convection come from geochemical constraints and mantle tomography. Constraints imposed by uranium-thorium systematics are examined in this paper. ...
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(2001)Three novel series of non-isoprenoidal dialkyl glycerol diethers with an inferred sn-1,2 stereochemistry were tentatively identified in carbonate crusts precipitated from methane-rich bottom-waters and pore-waters associated ...
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(1989)Three long-lasting epochs in the earth's tectonic evolution are identified. First, the Catarchean epoch was characterized by the earth's endogenic passivity. Then, the exceptionally active Archean epoch was dominated by ...
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(1997)Melt inclusions were studied in olivine, plagioclase, and orthopyroxene from nine basaltic andésite samples collected on young cones of the Medvezh'ya caldera on Iturup Island, southern Kuril Archipelago. Melts of the ...
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(2006)The Lhasa block of Tibetan Plateau is one of the most important regions in revealing the collision between India and Asia. The entire processes of collision, from the Tethyan oceanic plate subduction to the subduction of ...
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(1997)The classical model of faulting predicts that slip planes occur in two conjugate sets. Theoretically, more sets can be contemporarily active if pre-existing structures are reactivated in a three-dimensional strain field. ...
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(2002)A 3-D finite-element scheme for direct current resistivity modelling is presented. The singularity is removed by formulating the problem in terms of the secondary potential, which improves the accuracy considerably. The ...
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(2004)A new approach for predicting traveltimes is proposed which makes use of sophisticated smoothing and interpolation techniques applied to observations from large earthquake catalogues. The technique produces 3-D empirical ...
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(2004)Numerical studies of ductile deformations induced by salt movements have, until now, been restricted to two-dimensional (2D) modelling of diapirism. This paper suggests a numerical approach to model the evolution of ...
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(2002)We report on the use of a pulsed gradient spin-echo imaging sequence for the three-dimensional (3D) imaging of water transport properties in two porous media: 2mm glass-beads and 0.15mm quartz-sand mixed with 2mm glass-beads. ...
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(2002)A 3-D frequency-domain solution based on a volume integral equation approach has been implemented to simulate induction log responses. In our treatment of the problem, we assume that the electrical properties of the bedding ...
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(2002)A 3-D finite-difference solution is implemented for simulating induction log responses in the quasi-static limit that include the wellbore and bedding that exhibits transverse anisotropy. The finite-difference code uses a ...
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(2002)Three-dimensional (3-D) electromagnetic (EM) inversion is increasingly important for the correct interpretation of EM data sets in complex environments. To this end, several approximate solutions have been developed that ...
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(2002)Continental rifting is treated as a mechanical instability developing under horizontal tectonic tension. The instability results in strain localization and the formation of a neck, which is interpreted as a rift zone. At ...
Now showing items 14009-14028 of 22924