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Browsing ELibrary by Title
Now showing items 5736-5755 of 21934
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(1993)Mineral modes have been determined for specimens of eight rock types from CuK? X-ray powder diffraction data using the Rietveld method. The samples include two granites, a granodiorite, adamellite, gabbro, basalt, trachyte, ...
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(2004)Radio occultation experiments have been simulated for the Arctic region on the basis of the regional atmospheric model HIRHAM4. Irregular structures in the atmosphere produce a violation of the quasi-sphericity in the radio ...
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(1996)A method has been developed to analyze both H- and O-isotope compositions of saline waters and fluid inclusion brines without significant interference of salts. It involves high-temperature distillation under vacuum and ...
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(2000)We present a simple new background modeling method particularly for the determination of trace concentrations of Pb, U and Th to date zircons chemically by electron microprobe. This method reduces the acquisition time ...
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(2003)Hydrologists have been struggling over the past decades to improve rainfall-runoff models. As a consequence, models proposed 20-30 years ago still keep evolving as progress is made in the understanding of catchment ...
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(2002)The luminescent properties of PbWO4: Gd3+ was studied. The luminescence of Gd3+ in PbWO4:Gd3+ was quenched. It is possible that the excitation states of Gd3+ locate in the conduction band of PbWO4 crystal. The luminescent ...
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(2004)We present a new method for data weighting in waveform inversion to improve the obtained seismological earth model. We define 'sensitivity' as an index to show the homogeneity of the waveform inversion data set. The ...
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(1996)The formation of clathrates in fluid inclusions during microthermometric measurements is typical for most natural fluid systems which include a mixture of H2O, gases, and electrolytes. A general model is proposed which ...
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(2003)Resolution is key to confidently identifying unique geologic features using ground-penetrating radar (GPR) data. Source wavelet ''ringing'' (related to bandwidth) in a GPR section limits resolution because of wavelet ...
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(2002)Typical isochron calculations involve using a least squares analysis of the data. If the scatter about a line through the data is perfectly Gaussian, then least squares provides an optimal handling of the data. However, ...
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IMPROVING NOBLE GAS BASED PALEOCLIMATE RECONSTRUCTION AND GROUNDWATER DATING USING 20NE/22NE RATIOS (2003)The interpretation of noble gas concentrations in groundwater with respect to recharge temperature and fractionated excess gas leads to different results on paleo-climatic conditions and on residence times depending on the ...
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(2004)Most methods for deriving Q from surface-seismic data depend on the spectral content of the reflection. The spectrum of the reflected wave may be affected by the presence of thin beds in the formation, which makes Q estimates ...
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(2000)Monitoring the Comprehensive Nuclear-Test-Ban Treaty will require improved seismic location capability for small-magnitude events. The International Monitoring System (IMS) is well suited to locate events that are large ...
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(2002)This paper examines several techniques that have the potential to improve the quality of slug test analysis. These techniques are applicable in the range from low hydraulic conductivities with overdamped responses to high ...
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(2003)It is hypothesized that the unit impulse response of a linearized kinematic diffusion (KD) model is a probability distribution suitable for frequency analysis of hydrologic samples with zero values. Such samples may include ...
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(1999)This paper reports measurements of geomagnetic variations at a geodynamic test site in Crimea using fast optically pumped Sx-magnetometers in the summer seasons of 1981-1983. It shows possibilities for short-term earthquake ...
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(2002)Atomistic computer simulation methods have been used to model the nature of nonstoichiometry and impurity defects in the bulk and at the (1014) surface of dolomite (MgCa(CO3)2). Calcium and Mg in the bulk and at the surface ...
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(2003)The Volgian Stage was a subdivision used in Russian and world geological literature for over a century. The stage was withdrawn from the general scale and replaced by the Tithonian Stage, when the Interdepartmental ...
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(2000)This paper presents combined 39Ar-40Ar and K-Ca analyses on gem quality, K-rich silicates: a muscovite and a sanidine, both from pegmatites. We attempted to directly determine the 40K branching ratio by comparing the ...
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(1986)Refined estimates of primitive upper-mantle (PUM) composition are derived here from the major-element and rare-earth-element (REE) contents of mantle lherzolites, using the approaches pioneered by Loubet et al. (1975) and ...
Now showing items 5736-5755 of 21934