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Now showing items 14498-14517 of 43490
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(2002)The Prelude began with the origin of Metazoa, perhaps between 720 and 660 million years ago (mya), and ended with the geologically abrupt appearance of crown bilaterian phyla that began between 530 and 520 mya. The origin ...
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(2002)Premelting effects in gehlenite (Ca2Al2SiO7) have been studied by Raman spectroscopy and calorimetry, and in gehlenite and pseudowollastonite (CaSiO3) by electrical conductivity. The enthalpy of premelting of gehlenite is ...
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(1989)The Paleozoic fold belt of southern Mongolia includes two systems, the Variscan (South Mongolian) and the Indosinian (Inner Mongolian or East Gobi). The first arose in the Early Carboniferous in the area of an old ocean ...
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(2002)The intercalation of europium ions (Eu3+) into the interlayer space of a layered silicate, magadiite, was conducted by ion-exchange reactions between magadiite and europium(III) chloride. X-ray diffraction and elemental ...
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(2001)The effect of ultrasounds on natural macroscopic vermiculite flakes has been studied. Conditions for the preparation of submicron vermiculite particles of narrow particle-size distribution by sonochemistry are described. ...
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(2003)Titanium was introduced into the clay structure by cation exchange with polymeric Ti cations which were formed by partial hydrolysis of Ti alkoxide in HCl. X-ray diffraction, N2 adsorption-desorption, chemical analysis, ...
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(2006)A new type of organoclays was synthesized by a novel one-step-synthesis procedure using urea decomposition. The resulting organophilic material is a highly crystalline smectite with stevensite structure and dimethyl ...
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(1999)Intercalation of amino acids into 10.0-A hydrated kaolinite was studied by powder X-ray diffraction (XRD), differential thermal analysis-thermal gravimetry (DTA-TG), and infrared (IR) spec-troscopy. Intercalation was found ...
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(2006)Cobalt (II) and Al (III) layered double hydroxides were precipitated from homogeneous solutions using urea hydrolysis under hydrothermal conditions. The particle sizes were controlled successfully by changing the reaction ...
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(2000)Differential diagenesis of the chemical components of pollen in sub-fossil records necessitates the isolation of a single `resistant' chemical component of pollen, prior to its isotopic analysis. As sporopollenin is ...
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(2006)Porous carbons rich in mesopores and with large pore volumes have been prepared by polymerization and carbonization of a carbon precursor, sucrose, within a matrix of the natural clay, halloysite. The carbon precursor was ...
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(2006)Synthesis of porous silica via mechanochemical treatment of talc and subsequent acid leaching was investigated by X-ray diffraction (XRD), Fourier transformation infrared spectroscopy (FTIR), scanning electron microscopy ...
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(1993)The feasibility of in-situ fluorination of sulfide minerals for sulfur isotope analyses has been demonstrated. Laser fluorination of powdered samples, previously analyzed by conventional bulk SO[sub 2] or BrF[sub 5] methods, ...
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(2006)The variations of phase and amplitude of LF signal propagating from the transmitter JJY (40 kHz, Fukushima prefecture, Japan) are analyzed. The receiver is situated in Petropavlovsk-Kamchatski (Russia). The time interval ...
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(2004)We present the results of ULF magnetic field observation at Karimshino station (Kamchatka, Russia). Using a case study we discovered an effect of suppression of ULF intensity about 2-6 days before rather strong and isolated ...
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(1999)In the framework of the Russian-French project, a series of geodesic stations for studying present-day crust deformations by the GPS method was organized on the Baikal geodynamic test ground. Processing of data of 3-year-long ...
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(2006)The reservoir system of the Manych River basin is located in the Kuma–Manych Depression of the southern Russian region, which is characterized by an arid climate, a shortage of water resources, and the development of salt ...
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(2006)Movement of the Adria microplate is one of the main elements for understanding crustal deformations in the central Mediterranean and central Europe. To study present-day tectonics in Adria and the nature of its boundary ...
Now showing items 14498-14517 of 43490