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Browsing ELibrary by Title
Now showing items 7641-7660 of 22924
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(1989)The microfossils of the genus Obruchevella, established by Ye. A. Reytlinger in the lower Paleozoic and Vendian deposits of the Siberian craton and for a long time unknown elsewhere, have recently attracted ever-increasing ...
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(2003)First-order reversal curve (FORC) diagrams have been experimentally shown to be a better way of discriminating domain states in a sample compared to the straightforward use of major hysteresis loops. In order to better ...
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(2003)Glacial deposits at the margins of the ice cap of the northern island of the Novaya Zemlya archipelago, Russia, contain numerous spherules and rare scoriaceous particles thought to be extraterrestrial. The 1 Kyr old glacier ...
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(1988)The authors investigated the lithology and geochemistry of the deposits of the diamond sequence in the interval from limestone L1 to coal 14 in area with various degrees of postdiagenetic alteration (the metamorphic grade ...
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(1989)We are the first to have obtained information concerning the effect of thermophilic organisms on the behavior of gold. The air of our work was to find microbic and algal-bacterial coenoses and ascertain their role in ...
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(2004)This study deals with the reticulate microornamentation of Late Devonian and Early Carboniferous conodont elements. This ornamentation pattern is considered to represent the imprint of secreting epithelial cells. The basic ...
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(2004)The absence of new mineral material from the Moon has caused a loss of interest in the mineralogical problems of the Earth's nearest neighbor. However, the application of new high-precision apparatus for study of the lunar ...
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(2005)Noctilucent clouds play an important role in the physics of the summer polar mesopause. They consist of tiny ice crystals with characteristic dimensions smaller than 200 nm. However, neither exact shape of particles nor ...
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(1998)The BET and micropore surface areas of different size fractions of four different unweathered alkali feldspars were calculated using gas adsorption data. BET surface area decreased with increasing grain size. Micropore ...
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(2005)The frameworks of zeolites and related crystalline microporous oxide materials, such as aluminophosphates, silicoaluminophosphates and metaloaluminophosphates, are built up of tetrahedrally coordinated (e.g., Si, Al, P) ...
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(2002)High-resolution compositional mapping and dating of monazite on the electron microprobe is a powerful addition to microstructural analysis and an increasingly important tool for tectonic analysis. Microprobe monazite ...
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MICROSCALE CONTROLS ON THE FATE OF CONTAMINANT URANIUM IN THE VADOSE ZONE, HANFORD SITE, WASHINGTON (2006)An alkaline brine containing uranyl (UO22+) leaked to the thick unsaturated zone at the Hanford Site. We examined samples from this zone at microscopic scale to determine the mode of uranium occurrence-microprecipitates ...
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(2003)We report in situ measurements of O-isotopic compositions of magnetite, olivine and pyroxene in chondrules of the Ningqiang anomalous carbonaceous chondrite. The petrographic setting of Ningqiang magnetite is similar to ...
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(2003)Current radiometric remote sensing technology enables high resolution data of vegetation biomass to be obtained in the form of the Normalized Difference Vegetation Index (NDVI). The present study uses such data to examine ...
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(2004)The variations of carbon isotope composition and nitrogen content in a natural diamond with mixed octahedral and cuboid habit have been studied with the ion microprobe technique (SIMS). The systematic variations of δ13C ...
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(2003)The interaction of the {101¯4} cleavage surface of calcite with Hg(CH3COO)2 aqueous solutions with concentration of 5 mM Hg(II) (pH 3.5), was investigated using microscopic and spectroscopic techniques. In situ atomic force ...
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(2001)Aqueous dissolution of the (1014) surface of calcite was observed at pH near 9 by using an atomic force microscope equipped with a fluid cell. The influences of carbonate (CO32-), strontium (Sr2+), and manganese (Mn2+) ion ...
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(2005)Recent development and advances in solid state NMR, together with theoretical analyses using quantum-chemical calculations and statistical mechanical modeling, have allowed us to estimate and quantify the detailed distributions ...
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MICROSCOPIC REVERSIBILITY OF SM AND YB SORPTION ONTO SMECTITE AND KAOLINITE: EXPERIMENTAL EVIDENCE (2003)The microscopic reversibility of the sorption of Sm and Yb onto kaolinite and smectite is investigated by introducing an isotopic disequilibrium between the clay and the solution. The experiments are performed at 25°C, in ...
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(2001)Microsommite, ideal formula [Na4K2(SO4)] [Ca2Cl2][Si6Al6O24], is a rare feldspathoid that occurs in volcanic products of Vesuvius. It belongs to the cancrinite–davyne group of minerals, presenting an ABAB… stacking sequence ...
Now showing items 7641-7660 of 22924