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Browsing ELibrary by Title
Now showing items 10454-10473 of 21934
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(2000)A new approach is proposed for mapping seismicity parameters. It incorporates the scale of the seismic process involved (precursory areas of large earthquakes) and interaction of seismicity at great distances. The concepts ...
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(2001)A technique for determining volume deformation variations is suggested and substantiated theoretically on the basis of the multiple-reflection longitudinal waves specified in the seismograms from distant earthquakes. Results ...
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(1995)Analysis of silicate minerals equilibrated at high pressure with silicate- (clinopyroxene) and carbonatite-melts (olivine, orthopyroxene, clinopyroxene, garnet, phlogopite) using proton- and electron-microprobe techniques, ...
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(2004)The adsorption selectivity for C1–C6 hydrocarbons in a gas mixture on a variety of adsorbents was measured at 26 and 80 °C at total pressures of 1, 2 and 3 atm. The adsorption isotherm reveals that the adsorption levels ...
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(2000)The comparative application of three complementary surface analytical techniques allows us to investigate the alteration process and to probe selectively, as a function of depth, the oxidation products of bornite, chalcopyrite ...
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(2001)In soil magnetism, the magnetic parameters alone are not always sufficient to distinguish the lithogenic from the pedogenic magnetic fractions. Sequential extraction techniques have therefore been incorporated into magnetic ...
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(2001)Processes of treatment of copper pyrite ores have been considered. The difficult-to-concentrate ores are widely utilized for producing the non-ferrous and noble metals. Particularities in concentration of the ores have ...
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(1988)The authors compare data on concentrations of selenium and tellurium in granitoid rocks of different geochemical types and consider the behavior of these elements during granitoid magma differentiation. Selenium in the ...
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(2001)Gaseous selenium compounds emitted into the atmosphere with the flue gases of power stations are an ecologic threat. The current classification of chemical elements categorizes selenium as a Class 1 hazard. This study deals ...
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(2003)We have determined the extent of Se isotope fractionation induced by reduction of selenate by sulfate interlayered green rust (GRSO4), a Fe(II)-Fe(III) hydroxide-sulfate. This compound is known to reduce selenate to Se(0), ...
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(1999)Selenium stable isotope ratio measurements should serve as indicators of sources and biogeochemical transformations of Se. We report measurements of Se isotope fractionation during selenate reduction, selenite sorption, ...
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SELENIUM SPECIATION AND PARTITIONING WITHIN BURKHOLDERIA CEPACIA BIOFILMS FORMED ON α-AL2O3 SURFACES (2003)The distribution and speciation of Se within aerobic Burkholderia cepacia biofilms formed on α-Al2O3 (1-102) surfaces have been examined using grazing-angle X-ray spectroscopic techniques. We present quantitative information ...
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(2002)Sulfide phases in peridotitic mantle xenoliths from Ichinomegata in Japan, Nunivak Island in Alaska, and southern Africa occur as globular grains within silicate minerals, and along grain boundaries of silicate and oxide ...
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(1997)We report new measurements of self diffusion coefficients (D) for Mg, Nd, Eu, Th, and U in a haplobasaltic (Fo15Di40An45) melt at 1 atm, 1400-1500°C, and oxygen fugacities corresponding to air and the Fe-FeO buffer. Diffusion ...
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(1996)We have measured self diffusion coefficients (D) for a wide variety of elements in a Fo15Di40An45 melt at 1 bar from 1350-1500°C. These measurements, including the first reported data for Yb, Ti, Zr, U, and preliminary ...
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(1996)Self diffusion coefficients (D*) for silicon and oxygen in anhydrous basaltic liquid [O/(Si + Al) = 2.5] were measured at 1 and 2 GPa and temperatures between 1320 and 1600°C. Simple diffusion couples were composed of ...
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(1998)Despite the fundamental importance of plates in the Earth's mantle convection, plates have not generally been included in numerical convection models or analog laboratory experiments, mainly because the physical properties ...
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(2003)Self-diffusion coefficients for Si and O in Di58An42 liquid were measured from 1 to 4 GPa and temperatures from 1510 to 1764°C. Glass starting powders enriched in 18O and 28Si were mated to isotopically normal glass powders ...
Now showing items 10454-10473 of 21934