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Browsing ELibrary by Title
Now showing items 3351-3370 of 21253
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(1988)We analyze the convective stability of a system consisting of two infinite horizontal layers separated by a contact boundary which in the case of hydrostatic equilibrium is planar and is located at a fixed depth. The layers ...
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EFFECT OF ACID AND ALKALI TREATMENTS ON SURFACE AREAS AND ADSORPTION ENERGIES OF SELECTED MINERALS (2002)Bentonite, biotite, illite, kaolin, vermiculite and zeolite were acidified or alkalized with hydrochloric acid or sodium hydroxide at concentrations of 0.1, 1.0 and 5.0 mole dm 3 at room temperature for two weeks. In acid ...
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(2002)Bentonite, biotite, illite, kaolin, vermiculite and zeolite were treated with 0.1, 1.0 and 5.0 mol. dm-3 HCl or NaOH. Suspensions of Na homoionic forms of the initial and the treated minerals were back titrated with 0.1 ...
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(1987)The paper reports on a study to determine the temperature and the composition at the invariant point in the system Ab-Ort as a function of HCl concentration in the aqueous fluid at Ptot = Pfl = = 1 kb. The procedure resembled ...
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(2004)An accurate 3D numerical model of the acoustic-gravity wave (AGW) excitation before an earthquake is proposed and linear plasma response in F region of the ionosphere is studied. It is shown that “reactive modes” of AGW ...
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(2000)The sessile drop method has been used for measurements of the surface tension of haplogranite (HPG) melts containing an excess of alkalis and phosphorous (HPG8, HPG8 + 5 wt% Li2O, 5 wt% Na2O, 20 wt% Na2O, 5 wt% K2O, 5 wt% ...
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(2004)The investigation of hydrous boro(alumino)silicate melts and glasses with near infrared (NIR) spectroscopy revealed an important effect of boron on the water speciation. In the NIR spectra of B-bearing glasses new ...
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(1988)We studied a series of cadmium tetrahedrites, relatively high in silver, from the Ushkatyn-III barite-lead-zinc deposit in the Atasu district in central Kazakhstan. Their chemical composition was determined with the electron ...
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(1995)Mineral magnetic properties of soils and parent materials have been interpreted in terms of paleoclimate and rates of soil formation but it is important to understand which minerals contribute to the mineral magnetic signal. ...
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(2002)Two samples of pure kaolinite with a significant difference in their crystallinity, a commercial kaolin sample with 20 wt.% of illitic component and one sample of illitic clay with up to 20 wt.% of kaolinitic component ...
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(1989)The mantle is a very complex physicochemical system, and one is forced to use simplified models to analyze the convection in it. We investigate a mathematical model of convection in a compressible mixture consisting of two ...
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EFFECT OF CRYSTALLITE SIZE ON SOLID STATE MISCIBILITY: APPLICATIONS TO THE PYRITE-CATTIERITE SYSTEM (1991)The miscibility gap in the FeS 2 -CoS 2 system has been studied for various crystallite sizes. The pyrite-cattierite solvus for bulk phases is strongly asymmetric and has a critical point of ~740°C and ~ 13 mol% CoS 2 . ...
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(2003)Scaled analogue models were used to study the effect of frictional and ductile detachments on thin-skinned extension. Models consisted of two halves; one half is the ductile and the other has a frictional detachment. ...
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(2002)The effect of elastic anisotropy (transverse isotropy) on the convergence behind a tunnel face is investigated by means of a parametric study. The applicability of existing expressions for evaluating the convergence behind ...
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(2003)Light hydrocarbons are commonly used to evaluate crude oils to determine oil families, in-reservoir alteration processes such as evaporative fractionation, water washing, incipient biodegradation, maturity, and temperatures ...
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(2002)Different opinions exist regarding the specific effect of Mg on soil physical and chemical properties. We hypothesized that Mg2+, compared with Ca2+, reduces saturated hydraulic conductivity (Ks) via promoting clay swelling, ...
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EFFECT OF EXPLOSION ENERGY AND DEPTH ON THE NATURE OF EXPLOSION CLOUD - A FIELD EXPERIMENTAL STUDY (2002)Field explosion experiments using dynamite were carried out to investigate the effect of explosion energy and depth on the nature of explosion cloud. The scaling law of explosion was established among the energy, depth, ...
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(2002)The effects of Fe oxidation state on the infrared (IR) spectra of dioctahedral smectite were studied using a purified and Na+-saturated fraction of the Garfield nontronite reference clay. The nontronite was first reduced ...
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(1996)Theories based on the assumption of an infinite medium show that the coda attenuation factor, Q-1c, of local earthquakes should be very close to the intrinsic Q-1i, whereas many observations show that Q-1c is close to the ...
Now showing items 3351-3370 of 21253