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Now showing items 998910008 of 39126

(2002)A newly developed XRFmicroprobe 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 Pbfree ...

(2004)Nondestructive, threedimensional (3D) elementconcentration mapping was performed and high spatial resolution and quantitative applicability were demonstrated. Xray computed tomography using synchrotron radiation developed ...

(2001)This paper deals with the problem of nonlinear seismic velocity estimation from firstarrival traveltimes obtained from crosshole and downhole experiments in three dimensions. A standard tomographic procedure is applied, ...

(1995)Density measurements have been performed on nine liquids in the system CaOAl2O3SiO2, in the temperature range of the melting point up to 1800°C, using both Pt and Irbased doublebob Archimedean method. In addition, the ...

(2001)We investigate a new algorithm for computing regularized solutions of the twodimensional magnetotelluric inverse problem. The algorithm employs a nonlinear conjugate gradients (NLCG) scheme to minimize an objective function ...

(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 ...

(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 ...

(2004)A model of nonlinearity of the contact between the vibrator baseplate and the ground is proposed to describe the distortion of vibroseis signals in the nearfield. A thin layer between the baseplate and the soil exhibits ...

(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 ...

(2001)A nonlinear tomographic inversion method that uses firstarrival traveltime and amplitudespectra information from crosshole radar measurements was developed to simultaneously reconstruct electromagnetic velocity and ...

(1988)During the eruption of the Klyuchevskiy volcano in MarchJune 1983, acoustic signals associated with explosive action in the Predskazannyy secondary crater and the summit crater were recorded. The activity of the summit ...

(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 ...

(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 ...

(1990)In many problems in nonlinear seismoacoustics one requires reliably measured insitu data on the square of the elastic nonlinear response (SENP) or rocks. In this paper we present the first experimental measurements of ...

(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 ...

(1996)The applications of the tools of nonlinear timeseries analysis to measurements obtained by digital ionosonde “PARUS,” created at IZMIRAN, is considered. Smallscale structure of the electron density Ne at Fregion of ...

(2003)Mechanisms by which dissimilatory ironreducing bacteria utilize iron and manganese oxide minerals as terminal electron acceptors for respiration are poorly understood. In the absence of exogenous electron shuttle compounds, ...

(Федеральное государственное бюджетное образовательное учреждение высшего образования «Сибирский государственный университет геосистем и технологий», 2017)The major factor of well drilling with PDC bit is a dynamic interaction of cutting tool and rock. In this paper nonstationary nonlocal model of inelastic deformations is applied to rock cutting with cutting tool problem. ...

(2003)The enantiomeric and carbonisotopic composition of the amino acid isovaline have been analyzed in several samples of the Murchison meteorite and one sample of the Murray meteorite. lEnantiomeric excesses of the amino ...

(2002)By extending the product and productsum spacetime covariance models, new families are generated as integrated products and productsums. These include nonintegrable spacetime covariance models not obtainable by the ...
Now showing items 998910008 of 39126