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Browsing Геология России by Title
Now showing items 3685-3704 of 39126
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(2003)Multi-electrode resistivity data can be used to compute the measurable response for conventional and focused configurations. Some of them are appropriate for detecting layer boundaries. Three different configurations are ...
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(2001)Mineralogical discrimination of iron oxides in soils and sediments is not a trivial task, mainly because of their small grain size and low concentration. With mineral-magnetic techniques, highly magnetic ferrimagnetic ...
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(2003)Changes in surface reflection at the arctic tundra at Ny-Ålesund, Svalbard (79° N) were monitored during the melting season 2002 using a low cost multispectral digital camera with spectral channels similar to channels 2, ...
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(1997)Surface hydroxyl groups were detected on silica, γ-alumina, quartz, and feldspar powders using diffuse reflectance Fourier transform infrared (IR)-spectroscopy. Spectra were collected on all samples before and after heating ...
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(1997)Based on a standard state of unit activity of the solute in a hypothetical one molal solution where activity coefficients are taken as unity at infinite dilution at all pressures and temperatures, the activity coefficients ...
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(1989)In the present article we shall focus on a method of obtaining the attainable boundaries of the region containing the admissible velocity profiles from estimates of the function τ(p) and some logical assumptions regarding ...
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(Томский политехнический университет, 2019)Techniques of stripping voltammetry (SV) determination of silver and gold in pyrites and carbonaceous matter are developed. The problem of quantitative transfer of the analytes into the solution is solved. For this purpose, ...
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(EDP Sciences, 2016)The paper considers the possibilities of use of the method of stripping voltammetry for finding platinum metals in mineral gold and ore raw material. A review of new options of electro-concentration of platinum metals on ...
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(2002)Experiments show that the concentration of lattice gold can be estimated against the bulk Au content dominated by sorption gold using extrapolation of the concentration of uniformly distributed Au vs. mean specific surface ...
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(1996)Several sample treatments and analytical methods for the measurement of black carbon in a wide variety of sediments were considered in which the removal of organic carbon is a critical step in the procedure. A comparison ...
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(2004)Two capillary electrophoretic analysis methods are presented; one optimized for the analysis of Br− and the other for determination of K+ in groundwaters of high conductivity. The water sampling was performed from the ...
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(1987)The authors determined the amount of carbon in plutonic olivines consisting of single crystals from nodules of ultramafic rocks and mineral phenocrysts in rocks of various origin. The determination of carbon in olivine ...
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(1997)The easily accessible fraction of metals in “rocks” is derived from leaching experiments. Aliquots of rock powders are mixed with ion-exchange resin and distilled water. The pH self adjusts to a value of ~ 3. After batch ...
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(2002)Calculating a 'fabric ellipsoid' from sectional fabric ellipses is a common requirement in studies of rock fabrics. There may be any number, N=<3 of sections, with arbitrary orientations, and absolute or relative sizes of ...
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(2003)Geometrical spreading plays an important role for amplitude preserving migration, which is a very time-consuming process. In order to achieve efficiency in terms of computational time and, particularly, storage space, we ...
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(2001)A procedure for the analysis of geochemical samples has been developed based on direct atomic-emission spectrometry for the determination of silver, gold and the platinum-group elements. Instrumentation comprised a DC arc ...
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(1998)For the first time, the growth rate of the (100) and (110) faces of goethite has been measured in situ with scanning force microscopy. Submicron sized goethite particles were immersed in aerated aqueous Fe(II)solutions, ...
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(1999)A procedure for structural investigations by X-ray diffraction of mixed-layer structures incor- porating swelling layers has been developed. For each sample, specimens saturated with different cations (Na, Mg, and Ca), are ...
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(1999)A series of experiments was carried out with three-layer models constructed of granite chippings, quartz sand, and cement; the inner layer of the models had lower strength. The models were loaded on a servocontrolled press ...
Now showing items 3685-3704 of 39126