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Now showing items 5773-5792 of 39004
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(2000)Transmission electron microscopy has been used to examine carbon isolated from the Allende meteorite. The structure of the carbon is rather disordered, consisting of curved and faceted graphene sheets with little large ...
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(2003)Fullerenes are widely applied in scientific and technical developments. Laboratory synthesis of them has led to such situation. Then, stable polyhedral carbon clusters, C60 and C70 have been found in natural substances. ...
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(2003)Intracrystalline organic compounds, enclosed within in situ precipitated marine microcrystalline calcite (automicrite), might represent either an inclusion or the catalyst of such precipitation. We use evidence from a Lower ...
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(1997)Volcanic gas and condensate samples were collected in 1993–1994 from fumaroles of Koryaksky and Avachinsky, basaltic andesite volcanoes on the Kamchatka Peninsula near Petropavlovsk–Kamchatsky. The highest-temperature ...
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(2003)The life orientation and mode of life of stylophorans are a subject of much ongoing debate. Examination of the ornamentation occurring both on the arm and theca in several cornutes and mitrates strongly supports the view ...
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(1998)The modern treatment of geochemical cycles requires a truly quantitative framework. This paper addresses various aspects of such quantification. The concepts of residence time and response time are reviewed. The important ...
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(2005)Based on powder X-ray diffraction (pXRD) measurements of many mica solid solution series of synthetic powder samples (between Mg, Co, Ni, and Fe end-members, with different degrees of oxidation, vacancy, and Al/Si contents, ...
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(2001)The chicken-and-egg problem of machine vision is that (a) abstracting objects requires images to be segmented, (b) segmentation requires greyscale statistics, (c) greyscale statistics are defined by segmented regions, and ...
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(2003)In the Earth's lithosphere, fungi are of fundamental importance as decomposer organisms, animal and plant pathogens and symbionts (e.g. lichens and mycorrhizas), being ubiquitous in sub-aerial and subsoil environments. The ...
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(1995)The coarse-grained lunar meteorites, Yamato-793169 and Asuka-881757, represent a new type of low-Ti mare basalt. This paper reports the results of a U#Th#Pb, Sm#Nd, and Ar#Ar isotopic study of Yamato-793169 performed as ...
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(2004)We report new absolute palaeointensity estimates using basalts from northeastern China (K/Ar age, 125-120 Ma) using the modified Shaw method in conjunction with the microwave technique. Samples for the palaeointensity ...
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(1993)The experimental study of the miscibility gap in the FeS2CoS2 system at different particle sizes with previously reported theoretical data on the miscibility in small-crystallite binary systems gives evidence for a ...
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(2003)In the present paper, we further examine the optimum conditions for rapid, precise and accurate determination of 234U/238U ratios in geological materials by multiple collector (magnetic-sector) inductively coupled plasma ...
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(2000)Introduction of the Melekhov Horizon into the regional stratigraphic scale for the Upper Carboniferous of the Russian Platform is discussed. The new horizon corresponds to a separate regional sedimentation cycle that ...
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(2004)The curve depicting generic diversity of Permian fusulinids has two distinct peaks: the Asselian-Sakmarian and Midian. The in-between minimum corresponds to the end of the Bolorian Age. The most significant extinctions of ...
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(2001)A fuzzy conceptual rainfall-runoff (CRR) framework is proposed herein to deal with those parameter uncertainties of conceptual rainfall-runoff models, that are related to data and/or model structure: with every element of ...
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(2003)Gabbroids were dredged together with ultrabasic rocks from the lower portion of the section of a large transverse ridge in the southern flank of the Vema Fracture Zone valley in the Central Atlantic. Their petrographic ...
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(1997)The solubility of α-GaOOH was measured in low ionic strength (0.025 M) HClNaCl solutions over the pH range 1.6–4.1 at 150, 200, and 250°C. A least squares linear regression of these data was used to determine the dissociation ...
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(1997)The solubility of α-GaOOH was measured in low ionic strength (0.025 M) HCl-NaCl solutions over the pH range 1.6–4.1 at 150, 200, and 250°C. A least squares linear regression of these data was used to determine the dissociation ...
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(2002)Results derived from gamma-ray spectrometry studies of volcanic rocks in a depth interval of 3540-8150 m are presented. The rocks are shown to have low concentrations of radioactive elements, which is consistent with the ...
Now showing items 5773-5792 of 39004