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Browsing ELibrary by Title
Now showing items 959-978 of 21638
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(1997)We present details of a modified technique for the extraction of α-cellulose from wood samples. The revised technique, based upon the sodium chlorite oxidation method of Green (1963) utilises an ultrasonic bath and small ...
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(2000)Interactions between several silicate and metallic phases are studied by applying a self consistent thermodynamic approach and using recent thermodynamic data. We compute proportions and compositions of oxidized silicates ...
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(2001)Determination of U-Th-Pb ages using the electron probe microanalyser (EPMA) is an inexpensive alternative method for dating monazite. The method is rapid and reliable, both for simple monogenenetic monazite and for complex ...
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(2004)The mineral ussingite, Na_2AlSi_3O_8(OH), an “interrupted” tectosilicate, has strong hydrogen bonding between OH and the other nonbridging oxygen atom in the structure. Infrared spectra contain a strongly polarized, very ...
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(2001)We present Raman and infrared spectra of gypsum to 21 GPa at 300 K. Our measurements encompass the internal modes of the (SO4ont size=-1>-4 up that lie between 400 and 1150 cm-1ydroxyl-stretching vibrations between 3200 ...
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(2003)The molecular structures of the basic copper phosphate minerals pseudomalachite, libethenite, and cornetite were studied using a combination of infrared emission spectroscopy, infrared absorption, and Raman spectroscopy. ...
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(2003)A standard procedure for conditioning a stochastic channel to well-test pressure data requires the minimization of an objective function. The Levenberg-Marquardt algorithm is a natural choice for minimization, but may ...
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(2002)An efficient, accurate numerical modeling scheme has been developed, based on the integral equation solution to compute electromagnetic (EM) responses of thin sheets over a wide frequency band. The thin‐sheet approach is ...
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(2003)In this paper we present a global model (GSRM-1) of both horizontal velocities on the Earth's surface and horizontal strain rates for almost all deforming plate boundary zones. A model strain rate field is obtained jointly ...
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(2003)An empirical model for investigating the behaviour of CaCO3 polymorphs incorporating a shell model for oxygen has been created. The model was constructed by fitting to: the structure of aragonite and calcite; their elastic, ...
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(1991)A model is developed for the thermodynamic properties of Fe2+–Mg2+-aluminate-titanate-ferrite spinels of space group Fd3m. The model incorporates an expression for the configurational entropy of mixing which accounts for ...
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(2003)A special session ‘Geosphere^biosphere coupling; cold seep related carbonate and mound formation and ecology’ was held at the AGU Fall conference in December 2000, and attracted considerable attention. A total of 17 oral ...
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(2003)In sedimentary geology, ground penetrating radar (GPR) is used primarily for stratigraphic studies where near-continuous, high-resolution profiles aid in determining: (1) stratigraphic architecture, (2) sand-body geometry, ...
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(2004)Opinion of geological experts is often formed despite a paucity of data and is usually based on prior experience. In such situations humans employ heuristics (rules of thumb) to aid analysis and interpretation of data. As ...
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(2001)Although the retention of rain-water by a forest floor consisting of vegetation litter has large hydrological and geomorphological effects in a forested catchment, its physical processes have not yet been clarified. For ...
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(2005)We have performed a thermodynamic analysis to determine the internal consistency of state-of-the-art experimental data for olivine, wadsleyite, and ringwoodite solid solutions. The analysis has been carried out between 200 ...
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(2002)The application of detrital zircon geochronology for provenance analysis is complicated by the presence of biases induced by natural processes and sample preparation. The biasing of age distributions as a result of magnetic ...
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(1996)Corals show great promise for preserving century-long records of ocean chemistry and temperature with weekly time resolution. Allison and Tudhope (1992) showed that direct microscale analysis of coral skeletons was possible ...
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(1998)We have studied the mineralogy and petrology of 229 calcium-aluminum-rich inclusions (CAIs) from ten CO3 meteorites of petrologic types 3.0–3.7. Subsets of these inclusions were measured by ion probe for magnesium, calcium, ...
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(2002)The characteristics of single- and multiphase flow through fractured rock are of considerable interest in petroleum and natural gas exploitation as well as in the risk assessment of underground repositories. Flow processes ...
Now showing items 959-978 of 21638