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Browsing ELibrary by Title
Now showing items 6707-6726 of 21934
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(2000)Hydrocarbon hydrogenolysis and CO2 hydrogenation in the presence of Fe/SiO2 and Ni/SiO2 catalysts were evaluated as potential mechanisms contributing to natural gas formation in coalbeds. The hydrocarbons used as reactants ...
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(2000)Oxygen-isotope fractionation factors for uraninite-water and UO3-water were determined from a series of uraninite-CO2 and UO3-CO2 exchange experiments between 100 and 300°C. The measured fractionation factors are similar ...
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(2004)Some Deep Seismic Sounding (DSS) revealed low velocity layers in the upper and middle crust of old platforms. The layers are often characterised by a lower electrical resistivity. It is not clear, however, how reliable the ...
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(2003)Oxygen isotopic compositions of silicates in eclogites and whiteschists from the Kokchetav massif were analyzed by whole-grain CO2-laser fluorination methods. Systematic analyses yield extremely low δ18O for eclogites, as ...
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(1998)The study of glass inclusions inside mantle minerals provides direct information about the chemistry of naturally occurring mantle-derived melts and the fine-scale complexity of the melting process responsible for their ...
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(2002)The theory of the low-field anisotropy of magnetic susceptibility (AMS) assumes a linear relationship between magnetization and the magnetizing field. This assumption is precisely valid in diamagnetic and paramagnetic ...
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(2003)The northeastern Yeongnam Massif consists primarily of pelitic to psammopelitic metasedimentary rocks, together with garnet-bearing leucogranites and granitic gneisses. Metapelitic mineral assemblages define three progressive ...
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(1993)Experiments were performed on the system Na2O–CaO–FeO–MgO–Al2O3–SiO2 at 1100°C, with the interest focused on the assemblage Liq+Aug+Pl+Ol and its boundaries. Glass synthesized in a very reducing atmosphere was used as ...
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(1997)A technique is proposed for calculating a new predictive parameter, RTL. The technique was tested using observations of four large earthquakes in Kamchatka (M > 7). It was found that a seismic quiescence had taken place ...
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(1995)We have investigated the low-temperature behavior of a suite of 'grown' synthetic and natural magnetites that span single-domain (SD) and multidomain (MD) behavior. Synthetic samples had been grown in the laboratory either ...
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(2004)The behaviour of the ammonium ion in synthetic buddingtonite, N(D,H)4AlSi3O8, has been studied by infrared (IR) spectroscopy from 20K to 298K and by 2H NMR spectroscopy from 120K to 298K. IR spectra were collected from 500 ...
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(2001)It has been realized previously (e.g. Borradaile 1994) that cycling through the Morin transition (Tm, occurring in ideal a-Fe2O3 at -10 °C) may have implications for the NRM of some haematite-bearing rocks. We investigate ...
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(2002)The crystal structure of stibnite [Sb2S3, Pnma, a=11.314(2), b=3.837(2), c=11.234(3) A, V= 487.7(3) A3 at 293 K] was refined in situ at 230, 173, and 128 K. It is a major characteristic of the structure that the Sb-S ...
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(2003)This paper reports low-temperature cycling (LTC) through the Verwey transition of anhysteretic remanence (ARM), partial ARMs and partially demagnetised saturation isothermal remanence (SIRM) induced at room temperature in ...
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(2004)It may be difficult to isolate stable palaeomagnetic vectors of different ages if they lie in grain assemblages with overlapping ranges of coercivity or of unblocking temperature. This is because some moments associated ...
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(1999)Early Cambrian sediments on the East European platform in North Estonia, represented mostly by clays and silty clays, were deposited under normal marine conditions. The sediments were never affected by significant tectonic ...
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(2001)The heat capacity of synthetic pentlandite Fe4.60Ni4.54S8 was measured over the temperature range 6-306 K. Experimental values of Cp (T) indicate that there are no phase transitions. The thermodynamic functions Cp (T), ...
Now showing items 6707-6726 of 21934