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Browsing ELibrary by Title
Now showing items 1165-1184 of 21768
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(2004)We present an application of the spectral-element method to model axisymmetric flows in rapidly rotating domains. The primitive equations are discretized in space with local tensorized bases of high-order polynomials and ...
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(1995)U-Xe and U-Kr ages of pitchblendes and uraninites are compared with isotopic U-Pb ages and chemical U-Pb ages calculated from electron microprobe data. It is shown that the U-Xe and U-Kr systems are helpful for the ...
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(1997)A fast EDXRF analysis by using radioisotope, 241Am as an exciting source and high-purity Ge as a planar detector in heavy rare earth separation processes by solvent extraction has been investigated. Applying the method, ...
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(2002)The isotope composition of Ph is difficult to determine accurately due to the lack of a stable normalisation ratio. Double and triple-spike addition techniques provide one solution and presently yield the most accurate ...
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(2002)Volcanic tremor and long-period (LP) events are characterized by sharp spectral peaks that generally result from resonance effects at the source and which concentrate most of the radiated energy. The understanding of these ...
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(2003)High-resolution and ultra-high-resolution X-ray computed tomography are rapid, non-destructive and extremely powerful techniques for three-dimensional examination and measurement of a great variety of geological materials ...
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(2001)The world is faced with increasing demands for high-quality drinking water and for removal of contaminants from municipal, agricultural, and industrial wastewaters. Treatment is required to obtain drinking water from most ...
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(2002)This paper illustrates the potentialities and the innovative character of surface analysis techniques such as nuclear microprobe analysis (NMA) and X-ray photoelectron spectroscopy (XPS) in the research field of humic ...
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APPLICATIONS OF NONSTATIONARY STOCHASTIC THEORY TO SOLUTE TRANSPORT IN MULTI-SCALE GEOLOGICAL MEDIA (2003)In this study, we make use of a nonstationary stochastic theory in studying solute flux through spatially nonstationary flows in porous media. The nonstationarity of flow stems from various sources, such as multi-scale, ...
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(2002)Petroleum geochemistry improves exploration efficiency by accounting for many of the variables that control the volumes of crude oil and natural gas available for entrapment, including source-rock distribution, richness ...
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(1997)New analytical techniques are utilized that permit the precise and accurate measurement of Pt-190-Os-186 isotope systematics. These techniques are applied to three different systems: sulfide ores associated with the 251.2 ...
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(1989)In many applications (geophysics, acoustics, or tomography) one encounters integral transformations. In geophysical applications, the transformation describes numerous procedures for time-shifted stacking of seismograms ...
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(1988)Diffusion and reactions involving the breakdown of formation of chemical compounds are closely similar in their kinetics. The main idea of the theory of absolute reaction rates is presented. The theory is in satisfactory ...
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(2003)X-ray computed tomography (CT) is a non-destructive technique with wide applications in various geological disciplines. It reveals the internal structure of objects, determined by variations in density and atomic composition. ...
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(2004)A basic theoretical understanding of stable isotope fractionations can help researczzzhers plan and interpret both laboratory experiments and measurements on natural samples. The goal of this chapter is to provide an ...
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(2004)Uranium(VI) adsorption onto aquifer sediments was studied in batch experiments as a function of pH and U(VI) and dissolved carbonate concentrations in artificial groundwater solutions. The sediments were collected from an ...
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(1999)Since no abstract was given for this paper, its subject matter can be derived from the headings given below: Introduction 1. The brief characteristics of the classical theory available for regularizing the systems of linear ...
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(1999)The abstract of this paper was not submitted. It is the continuation of paper "Approximation approach to the solution of gravity and magnetic problems. 1. The regularization of the systems of linear algebraic equations as ...
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(2004)Volgian aptychi from the Russian Platform are described and figured for the first time. The Lower Volgian klimovi Zone and the uppermost Kimmeridgian beds contain Lamellaptychus submortilleti Trauth, 1938. The pseudoscythica ...
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(2004)Evident from the presented results, Riphean sedimentary rocks similar to the experimental ones may generate, in the course of natural OM maturation, approximately 40 kg/t of liquid and 50 kg/t of gaseous hydrocarbons ...
Now showing items 1165-1184 of 21768