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Now showing items 8868-8887 of 42285
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(2004)Epidote group is important rock-forming minerals which form in a variety of geological conditions. Crystal structure of epidote contains 9-coordinated A1 and 10-coordinated A2 sites, and three kinds of octahedral sites, ...
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(2005)Ionization constants for several simple amino acids have been measured for the first time under hydrothermal conditions, using visible spectroscopy with a high-temperature, high-pressure flow cell and thermally stable ...
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(1987)Accurate values of ionization constants of water over a wide range of temperatures and pressures are needed for a quantitative description of the properties of hydrothermal ore-generating solutions. The ionization constants ...
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(2001)The interaction of γ-rays with smectites induces paramagnetic defects in the structure of these clay minerals. The EPR spectra of three different smectites detect the creation of structural defects and trapping of organic ...
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(2004)Statistics of spectral resonance structures of the ionospheric Alfven resonances (IAR) in the ULF frequency range 0.1–5.0 Hz is presented on the basis of the analysis of data obtained from July 2000 to December 2002 (2.5 ...
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(2004)The magnetosphere-ionosphere-thermosphere subsystem is strongly coupled via the electric field, particle precipitation, heat flows and small scale interaction. Satellites in situ measurements and ground based complex ...
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(2006)The transmittance spectra of Types I and III silica glasses in the 1300 to 5000 cm- 1 region are measured and the absorptivity spectra calculated from data obtained are processed with the dispersion analysis method based ...
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(2002)The IR spectrum of ammonium-exchanged natural analcime (basalt, Nidym River, Siberian platform) exhibits several features that suggest a lowered symmetry for the NH4+ ion and that this is influenced by hydrogen bonding ...
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(1999)The concentrations of the platinum-group elements (PGE) Ir, Ru, Pt, and Pd were determined in 18 mantle-derived basalts from a variety of tectonic settings and six komatiites from three locations. All analyses were performed ...
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(1989)There are data indicating that geochemical anomalies (particularly of elevated iridium concentrations) in the sections through sedimentary rocks are confined to boundaries marked by considerable changes in animal life in ...
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(2004)We have synthesized hydrothermally sulfides of Fe, Cu, Pb, and Zn in the presence of Ir; 192Ir was employed as the radioactive tracer, and its distribution in run products was determined by autoradiography. None of the ...
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(1988)The authors determined the concentrations not only of iridium and palladium, but also of nickel in basalt and komatiite samples from Late Archean greenstone belts of the Baltic shield. Most information on iridium was ...
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(2004)A reappraisal of Hermann's ‘irite’, described in 1836 and 1841, has been attempted by examining and analysing three museum samples, accessioned before 1865. The three samples were determined to be mixtures of chromite, ...
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(2003)The influence of aqueous silica on the hydrolysis of iron(III) nitrate and chloride salts in dilute aqueous solutions (mFe ~ 0.01 mol/kg) was studied at ambient temperature using X-ray absorption fine structure (XAFS) ...
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(1996)Iron is a metabolic requirement of living systems, yet iron is very insoluble in aerobic, neutral environments. Therefore, the amount of iron in solution under these conditions is not sufficient to meet the nutrient ...
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(2003)Microbial processes within the ocean crust are of potential importance in controlling rates of chemical reactions and thereby affecting chemical exchange between the oceans and lithosphere. We here assess the oxidation ...
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(2002)The chemical status of major and trace elements (TE) in various boreal small rivers and watershed has been investigated along a 1500-km transect of NW Russia. Samples were filtered in the field through a progressively ...
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(1999)In order to verify Fe control by solution - mineral equilibria, soil solutions were sampled in hydromorphic soils on granites and shales, where the occurrence of Green Rusts had been demonstrated by Mossbauer and Raman ...
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(2003)The distribution of iron atoms in the octahedral sheet of a series of dioctahedral smectites with varying unit-cell composition and iron content was investigated by Fe K-edge XAS spectroscopy. First-step analysis reveals ...
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(1986)Manganese, iron, and helium isotopes have been measured in samples taken near the crest of the East Pacific Rise at 19°S. Samples were enriched in Mn and in He isotopes, as is typical for waters of this area. Samples were ...
Now showing items 8868-8887 of 42285