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Browsing by Title
Now showing items 11808-11827 of 39124
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(1997)We present a method of calculation to simulate numerically the growth and propagation of shear cracks in an elastic medium. The problem is formulated in terms of integral equations written along the crack contour. These ...
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(2004)The main purpose of the present paper is to present the mathematical expression for the frequency-dependent effective acoustic properties of a liquid–bubble mixture. Effects of the bubble resonance, the heat and mass ...
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(2004)Volcanic explosions generate pressure perturbations in the atmosphere and a seismic wavefield in the ground. The source is therefore well coupled with the atmosphere and the ground. The acoustic and elastic wavefields ...
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(1987)The authors analyze the lateral time variation in longitudinal-wave velocities in the crust of a seismically active region. This required data from long-term seismic observations with controlled wave generators in dense ...
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(1996)Geochemical codes are used to identify the processes (speciation, solubility, and adsorption) controlling both natural water and waste leachate compositions. The uncertainties in geochemical calculations are important to ...
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(2004)Near-receiver material properties are required for the separation of the recorded wavefield into upgoing and downgoing P and S waves, and are also important for static time-shift corrections. However, it is difficult, ...
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(2001)Capabilities of the polarisation method vertical sesmic profiliring – PM VSP and logging to prediction collectors properties of geological section in near borehole space are considered. Fractured-porous collectors with ...
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(PANGAEA, 1987-10-23)Fifteen iron oxide accumulations from the bottoms of two Finnish lakes ("lake ores") were found to contain as much as 50% Fe. Differential X-ray powder diffraction and selective dissolution by oxalate showed that the samples ...
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(1989)A kimberlite pipe found in Yakutia differs sharply in geologic structure from those studied earlier. Drillhole in kimberlite-hosting marls of the Kyllakh formation penetrated bands and lenses of andradite-grossular skarn ...
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(2006)The reactivity of colloidal particles is regulated by their surface properties. These properties affect the wettability, flocculation-dispersion characteristics, ion exchange, sorption capacities and transport of inorganic ...
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(2003)Regularities of influence of a single-phase (SP) oxidation and a subsequent decomposition of synthetic titanomagnetites (TM) of a different original composition (Fe3-x TixO4 (where x = 0.2, 0.4 and 0.6)) upon the change ...
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(PANGAEA, 2003-08-09)Dependence of the faunal composition and species structure of the White Sea littoral Harpacticoida on sediment properties was studied. Three groups of species could be distinguished according to their relationship with ...
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(2001)Approximate formulae for PP reflection/transmission (R/T) displacement coefficients for weak contrast interfaces separating weakly anisotropic media of an arbitrary symmetry are presented. The coefficients have a form of ...
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(2006)По целому самцу хорошей сохранности из юрского местонахождения Даохугоу (Северо-Восточный Китай) описан новый вид Proptychopterina opinata sp. nov. Обсуждается распространение Proptychop-terina, приводятся уточненный диагноз ...
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(2001)Opportunities for development of deposits of polymetallic ores of Ozernyj ore field have been considered. The ore contains many elements including zinc and lead. Review of technological schemes for processing the ores has ...
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(2004)Based on own laboratory experience and a literature review, techniques for processing of different sedimentary lithologies and microscopical investigation in Neoproterozoic-Cambrian sequences are described. Emphasis is ...
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(2003)We are in the process of developing a small portable absolute gravimeter that employs a cam-based dropping mechanism. The resulting high data rate (100 drops in 30 s) serves to compensate for the short (2 cm) dropping ...
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(2001)Generation of electric energy at various power stations including those operating on pulverized coal has been considered. It has been shown that generation of electric energy with the use of the pulverized coal is the most ...
Now showing items 11808-11827 of 39124