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Browsing by Title
Now showing items 9965-9984 of 39068
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(1988)The paper presents a theory to understand the mechanism governing the contribution of sediments to the phosphorus exchange with the water column, and to plan methods of evaluating the danger of the sediments acting as a ...
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(2003)Fe isotopes can be fractionated to similar extent by both biological and nonbiological processes in the laboratory. However, fractionation mechanisms are not yet clear, making it difficult to generalize from the laboratory ...
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(2001)Mantle-derived spinel harzburgites from the Kamchatka arc have fractionated Pd- group element patterns, and Pt is clearly enriched relative to Pd and Rh. This fractionation is also consistent with chondritic Ir-group ...
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(2002)A newly developed XRF-microprobe at the Institute of Mineralogy and Petrology, University of Bern, Switzerland has been applied for precise chemical Th–U–Pb dating of individual monazite grains separated from Pb-free ...
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(2004)Nondestructive, three-dimensional (3-D) element-concentration mapping was performed and high spatial resolution and quantitative applicability were demonstrated. X-ray computed tomography using synchrotron radiation developed ...
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(2001)This paper deals with the problem of nonlinear seismic velocity estimation from first-arrival traveltimes obtained from crosshole and downhole experiments in three dimensions. A standard tomographic procedure is applied, ...
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(1995)Density measurements have been performed on nine liquids in the system CaO-Al2O3-SiO2, in the temperature range of the melting point up to 1800°C, using both Pt- and Ir-based double-bob Archimedean method. In addition, the ...
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(2001)We investigate a new algorithm for computing regularized solutions of the two-dimensional magnetotelluric inverse problem. The algorithm employs a nonlinear conjugate gradients (NLCG) scheme to minimize an objective function ...
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(1989)In recent years, detailed investigations with equipment such as unmanned and manned submersibles have provided new data that can be used to make the first quantitative estimates of the rate of structure formation at various ...
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(1990)If rocks are fragmented, then shear causes them to become less compact via the mechanism of dilatancy, and thus one observes an increase in the effective viscosity, as well as in the shear rate. It has been found in ...
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(2004)A model of nonlinearity of the contact between the vibrator baseplate and the ground is proposed to de-scribe the distortion of vibroseis signals in the near-field. A thin layer between the baseplate and the soil exhibits ...
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(1990)Recent experimental studies of the nonlinear transformation of long waves in shallow waters indicate that the process involves the generation of higher harmonics that distort the shape of the long wave. To describe the ...
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(2001)A nonlinear tomographic inversion method that uses first-arrival travel-time and amplitude-spectra information from cross-hole radar measurements was developed to simultaneously reconstruct electromagnetic velocity and ...
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(1988)During the eruption of the Klyuchevskiy volcano in March-June 1983, acoustic signals associated with explosive action in the Predskazannyy secondary crater and the summit crater were recorded. The activity of the summit ...
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(2004)We develop a rock physics model based on nonlinear elasticity that describes the dependence of the effective stiffness tensor as a function of a 3D stress field in intrinsically anisotropic formations. This model predicts ...
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(2001)To study the effects of nonlinearity in the seismic response of soils, a numerical simulation of the propagation of vertically incident seismic waves in horizontal soil layers were performed. Shear noiselike and monochromatic ...
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(1990)In many problems in nonlinear seismoacoustics one requires reliably measured in-situ data on the square of the elastic nonlinear response (SENP) or rocks. In this paper we present the first experimental measurements of ...
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(1999)In this paper we investigate the presence of chaos in the system that underlies the Phanerozoic 87Sr/86Sr isotope record of seawater carbonates by means of nonlinear time series analysis. The Fourier power spectrum estimation ...
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(1996)The applications of the tools of nonlinear time-series analysis to measurements obtained by digital ionosonde “PARUS,” created at IZMIRAN, is considered. Small-scale structure of the electron density Ne at F-region of ...
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(2003)Mechanisms by which dissimilatory iron-reducing bacteria utilize iron and manganese oxide minerals as terminal electron acceptors for respiration are poorly understood. In the absence of exogenous electron shuttle compounds, ...
Now showing items 9965-9984 of 39068