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Browsing ELibrary by Title
Now showing items 1287-1306 of 21934
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(2003)Assessment of the glaucophane substitution, [M4]Ca + [VI]Mg ↔ [M4]Na + [VI]Al, along the Ga and F analogue of the tremolite-glaucophane join, □Ca2Mg5Si8O22F2-□Na2Mg3Ga2Si8O22F2 (= F-Ga-glauc), was conducted at 900 °C and ...
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(2001)The geoelectrical structure of the Earth's mantle is estimated to a depth of 1000 km on the basis of comprehensive use of data from magnetovariation sounding (obtained at the Ukrainian geomagnetic observatories in Korets ...
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ASSESSMENT OF DIRECT TRANSFER AND RESUSPENSION OF PARTICLES DURING TURBID FLOODS AT A KARSTIC SPRING (2003)Turbid water can be the source of important sanitary problems in karstic regions. It is the case of the Pays de Caux, in Haute Normandie, where the main resource in drinking water is provided by the chalk aquifer. In the ...
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(2003)Analytical errors calculated for individual spot 206Pb/238U measurements of zircon analyzed using high mass resolution secondary ion mass spectrometry (HR-SIMS, e.g., SHRIMP II) were assessed using natural zircon (z6266) ...
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(2001)We construct new Love and Rayleigh wave phase velocity models based on measurements made from an aspherical starting model and strict data quality control derived from cluster analyses. These new models are in good agreement ...
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(2002)High-resolution gas adsorption techniques were used to analyse the evolution of the aspect ratio and adsorption energy distribution on synthetic saponite samples with increasing layer charge. Using Ar as a gaseous probe, ...
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(1999)An evaluation of early solar system chronometry by the Pb-Pb and U-Pb methods is provided. Specifically, three consequential factors are examined: procedure of age calculation, extent of terrestrial Pb contamination, and ...
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(1995)Synchrotron X-ray Fluorescence (SXRF) analysis is a nondestructive analytical technique that provides compositional information from single fluid inclusions. A protocol for conducting quantitative analyses of metal ...
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(2004)Raman spectroscopy was assessed for its ability to rapidly identify asbestos phases by submitting the amphiboles anthophyllite, amosite, crocidolite and tremolite to spectroscopic analysis. All the phases were characterized ...
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(2000)In order to evaluate the widely accepted assumption that Zr/Hf ratios are uniform and chondritic (i.e. equal to 36.6) in terrestrial rocks [Jochum et al., Geochim. Cosmochim. Acta 50 (1986) 1173-1183], precise Zr/Hf ...
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(2001)Deterministic models are used to predict the risk of groundwater contamination from non-point sources and to evaluate the effect of alleviation measures. Such model predictions are associated with considerable uncertainty ...
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(2003)The characteristic basic construction of early land plants with an upright posture is represented by a simple leaf- and rootless axis system with a central conducting bundle ('rhyniophytic habit'). Variations of this simple ...
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(1989)The correlation of mineral deposits with fault nodes has long been known; the new aspect of the present treatment is the fact that most of the deposits considered are associated with potential high-seismicity nodes and ...
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(1988)We found natural lead-antimony alloys with very little or no tin, in heavy mineral concentrates from the Yukhotochka and the Tayezhka Creeks in the southeastern part of the Yukhta fault zone, central Aldan. The streams ...
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(2004)The paper attempts to identify ionospheric parameters in association with earthquake at anomaly crest station through VHF Radio Beacon data and ground based ionosonde measurements while the Total Electron Content(TEC) ...
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(2003)Citric acid is found along with uranyl in the subsurface of former nuclear facilities because of its use as a decontamination agent in the nuclear industry. Citrate's metal chelating properties affect the mobility of uranyl ...
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(1999)The speciation and molal formation quotients for the complexation of aluminum with sulphate were measured based on potentiometric and solubility experiments. Potentiometric titrations, utilizing a hydrogen-electrode ...
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(1989)Peri-fault metasomatites of the associational types discussed differ in chemical bias or specialization (Table 1). The subalkalic feldspathic metasomatites containing lepidomelane tend to concentrate Be, Nb, Ta and the ...
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(1987)This article describes Cenozoic basaltic rocks in the Sea of Japan. Analysis of a large body of data leads to a division of them into natural associations of volcanic rocks and specific geochemical types. Their classification ...
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(2004)The platinum-group minerals (PGM) and chromite composition of the Zolotaya River gold placer, in the Russian Far East, indicate a genetic relationship to poorly exposed Late Permian dunite - hornblendite - gabbro intrusions ...
Now showing items 1287-1306 of 21934