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Browsing ELibrary by Title
Now showing items 13783-13802 of 26297
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(1997)A large instrumental mass fractionation (IMF) occurs during the measurement of oxygen isotope ratios by secondary ion mass spectrometry and the magnitude of this fractionation can be dependent upon sample chemistry, resulting ...
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(1998)The calibration of U-Pb and Th-Pb ratios in Th-U-rich minerals measured by SIMS usually assumes that there are no matrix effects arising from the compositional difference between standard and sample. Matrix effects have ...
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(2002)This paper describes microanalysis techniques using secondary ion mass spectrometry (SIMS) to measure the abundances and isotopic compositions of hydrogen, carbon, fluorine, sulfur and chlorine in volcanic glasses. SIMS ...
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SIMULATED ANNEALING INVERSION OF MULTIMODE RAYLEIGH WAVE DISPERSION CURVES FOR GEOLOGICAL STRUCTURE (2002)Simulated annealing was used to invert fundamental and higher-mode Rayleigh wave dispersion curves simultaneously for an S-wave velocity profile. The inversion was applied to near-surface seismic data (with a maximum depth ...
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(2001)Simulated annealing has been applied to seismic ray tracing to determine the minimum traveltime ray path connecting two points in complex 3-D media. In contrast to conventional ray tracing schemes such as shooting and ...
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(1999)The Fe-Mg thermometer widely used to infer the “equilibration” temperature of garnet-clinopyroxene assemblages of eclogites records the progressive blocking of diffusion-limited exchanges between coexisting mineral phases. ...
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(2001)Numerical simulations indicate that mechanical dispersive mixing can be the dominant mass transport mechanism in large peatlands. Dispersive mixing driven by lateral flow can drive solute fluxes from the mineral soil upward ...
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(2003)Soil moisture (SM) plays an important role in land surface and atmospheric interactions. It modifies energy balance at the surface and the rate of water cycling between the land and atmosphere. In this paper we provide a ...
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(2003)Initiation of macropore flow either from the soil surface or from a saturated soil layer at depth is a first order control on water flow in macropores and water transfer from macropores into the surrounding soil matrix. ...
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(2001)Over the past decade computer simulation techniques have become an increasingly valuable tool in science as an aid to the interpretation of experimental data and as a means of yielding an atomic level model (Catlow et al. ...
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(2003)During propagation through random media, impulsive waves radiated from a point source decrease in amplitude and increase in duration with increasing travel distance. The excitation of coda waves is prominent at long lapse ...
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(2001)Groundwater mounds and hinge lines are important features related to the interaction of groundwater and lakes. In contrast to the transient formation of groundwater mounds, numerical simulations indicate that permanent ...
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(2001)Accurate prediction of water flow and chemical transport in agricultural soil profiles requires the use of a simulation model that considers the most important physical, hydrological and chemical processes. Two important ...
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(2001)Bore hole breakout is an important method to measure the orientation of earth stress. For inhomogeneous rocks, actual orientation of break out usually deviates from the minimum compressional stress predicted by idealistic ...
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(2001)Experiments in area of liquid chemically active jets on destroyed material have shown high efficiency of this process. In order to provide material saving, opportunity for the liquid jets replacement with gas jets has been ...
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(2006)Numerical models are presented that simulate several active tectonic processes. These models include a continent that is thermally and mechanically coupled with viscous mantle flow. The assumption of rigid continents allows ...
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(2006)This paper presents materials on one of the units with PGE ore mineralization in the Pana Massif: the results of a detailed petrographic study and microprobe analyses of silicate and sulfide minerals and of the examination ...
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(2001)Oceanic bottom pressure is affected by mass redistribution in the ocean and atmosphere, and it influences gravity field determinations by the new satellite missions CHAMP, GRACE and GOCE from seasonal up to short-period ...
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(2001)Water-bearing fluids are suggested to result from thermodynamically equilibrium interaction andesite - water in the zone of accumulation of hydrothermal solutions from peripheral magma chambers. Thus, intermediate magma ...
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(2003)The time domain random walk (TDRW) method has been developed for simulating solute transport in discrete fracture networks. The following transport processes have been considered: advective transport in fractures, hydrodynamic ...
Now showing items 13783-13802 of 26297