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Now showing items 15845-15864 of 39126
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(1997)In the oxidation of sulfide to sulfate a number of different intermediate products are commonly observed, but products with S oxidation states of + 2 seem generally to be absent. Recently Vairavamurthy and Zhou (hereafter ...
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(1999)Expanding upon our previous studies of the properties of Au complexes, we present calculations for several Hg (super 2+) species in aqueous solution and for molecular models for cinnabar. Hydration effects are treated with ...
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(2005)Energetics for the condensation dimerization reaction of monosilicic acid: 2Si4(OH)⇒2SiO7H6+H2O have been calculated quantum mechanically, in gas-phase and aqueous solution, over a range of temperatures and dielectric ...
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(2003)I introduce a partial differential equation to describe the process of prestack reflection data transformation in the offset, midpoint, and time coordinates. The equation is proved theoretically to provide correct kinematics ...
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(2002)Nanoscience is a relatively new field of research that primarily involves the discovery and exploration of the properties of matter in the size range of roughly one to 100 nanometers, the so-called nanoscale. Mechanical, ...
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THERMAL AND CHEMICAL VARIATIONS IN SUBCRUSTAL CRATONIC LITHOSPHERE: EVIDENCE FROM CRUSTAL ISOSTASY (2003)The Earth’s topography at short wavelengths results from active tectonic processes, whereas at long wavelengths it is largely determined by isostatic adjustment for the density and thickness of the crust. Using a global ...
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(1989)A thermal and gasdynamic (TGD) model of earthquakes is described. The model is based on Sadovskiy's idea that the energy of earthquakes is linearly related to the focal volume and the definition of a new role of supercritical ...
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(1998)Present-day seismic evidence implies that the 660 km-deep seismic velocity jump is associated with neither an internal thermal boundary layer nor a strong internal barrier to flow between the upper and lower mantle. However, ...
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(Russian Geology and Geophysics, )
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(1995)During the early episode of the solar system, the L6 chondrite Tenham has been affected by intense thermal metamorphism. Microanalytical data reveal homogeneous compositions of olivine (Fo75Fa25), enstatite (En79Fs19Wo2), ...
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(1999)The effect of the size and shape of the thermal aureole of intrusive bodies on the maturity of organic matter in the host rocks is analyzed. The vitrinite reflectance calculated by the vitrinite kinetic model is compared ...
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(2002)Scapolite-group minerals have the general formula and TG) were carried out on two samples (Me79.6 and Me33.3) using a Netzsch STA 409 EP/3/D simultaneous TG-DTA apparatus and a Netzsch STA 449C simultaneous TG-DSC instrument. ...
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(2004)The thermal decomposition of ammonium-exchanged natural analcime is characterized by gas chromatography, IR spectroscopy and X-ray diffraction. The de-ammoniation and dehydroxylation proceed in parallel throughout the ...
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THERMAL BEHAVIOUR OF PYROPE AT 1000 AND 1100 °C: MECHANISM OF FE2+ OXIDATION AND DECOMPOSITION MODEL (2003)The mechanism of thermally induced oxidation of Fe2+ from natural pyrope has been studied at 1000 and 1100 C using 57Fe Mssbauer spectroscopy in conjunction with XRD, XRF, AFM, QELS, TG, DTA and electron microprobe analyses. ...
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(2002)To optimise stone consolidation it is necessary to understand the mechanisms of weathering in marbles, the control by the mineralogical composition and the rock fabric. The knowledge of how the stone consolidants affect ...
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THERMAL CONDUCTIVITY AND THERMODYNAMICS OF MAJORITIC GARNETS: IMPLICATIONS FOR THE TRANSITION ZONE (2004)Thermal conductivity at room temperature and pressure (k0), and heat capacity and total entropy as functions of temperature are calculated for majorite-pyrope garnets from new and previous infrared reflectivity and Raman ...
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(1999)Geochemical models have frequently divided the mantle into depleted upper and undepleted lower mantle reservoirs, usually taken as indication for a layered style of convection. This is difficult to reconcile with seismological ...
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(2001)We model the thermal and mechanical structure of Precambrian foreland lithosphere subject to a range of initial thermal states and evolving thermal perturbations beneath an orogen. Temperatures in the lower crust exert a ...
Now showing items 15845-15864 of 39126