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Browsing ELibrary by Title
Now showing items 5228-5247 of 21879
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(2002)Since the mid-1980s, a relative explosion of groundwater-recharge studies has been reported in the literature. It is therefore relevant to assess what is now known and to offer further guidance to practitioners involved ...
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(2004)Accurate mapping of the electrical conductivity and of the redox potential of the groundwater is important in delineating the shape of a contaminant plume. A map of redox potential in an aquifer is indicative of biodegradation ...
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(1997)Group additivity equations of state for aqueous organic molecules have been generated by combining the revised Helgeson-Kirkham-Howers (HKF) equations of state with experimental values of the standard molal properties of ...
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(2001)Hydrologic data sets are often of short duration and also suffer from missing data values. For estimation and/or extrapolation, the presence of missing data not only affects the choice of a particular method of analysis ...
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(2001)The formation of Gondwana during the late Neoproterozoic to early Cambrian times (550-530 Ma) was traditionally viewed as the welding of two, more or less contiguous, Proterozoic continental masses called East and West ...
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(2005)Er3+:Y0.5Gd0.5VO4 crystal with good optical quality was grown by Czochraski method. The structure of the crystal was determined by X-ray powder diffraction method. The segregation coefficient of Er3+ ions in the crystal ...
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(2002)The surface defines the interface between a mineral and its surroundings. In a dynamic context, reactions that occur between apatites and the environments in which they exist take place at or through their surfaces. This ...
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(2001)Microphenocrysts of chromian spinel in glass from an East Pacific Rise lava and three Icelandic subglacial lavas show a variety of complex skeletal, hopper, vermiform and chain textures. These grains of chromian spinel are ...
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(2001)We explore the role played on the growth of shallow-water carbonates by changes in accommodation using case studies from Late Quaternary to modern carbonate environments, i.e. coral reefs and carbonate platforms and ramps. ...
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(2003)Disc-shaped methane bubbles, often observed in marine sediments, result from growth in a medium that elastically resists expansion of the bubbles and yields by fracture. We have modeled this process to obtain estimates of ...
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(2004)Interaction of concentrated acidic uranyl-bearing solutions at initial values of pH of 2.5 and 4.5 with calcite at 25°C in an open system results in formation of schoepite, becquerelite and wyartite-II. Interaction of ...
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(1989)We investigated ferromanganese nodules primarily in order to obtain new data on the concentrations and isotopic composition of He, Ne and Ar in them; the objective was to determine whether they contained space dust and to ...
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(2004)With uranium rich skeletons and density bands similar to their surface coral counterparts, deep-sea scleractinia are a promising archive of past climate. To improve the utility of fossil samples as monitors of deep ocean ...
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(1998)Ion microprobe analyses of as-grown{1014} faces of B-doped calcite single crystals show that boron oxyanions are incorporated differentially between nonequivalent vicinal faces that compose spiral growth hillocks. The ...
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(2002)Grus is an ill-defined product of deep weathering of coarse-grained rocks whose relationships to other weathering changes remain unclear. This paper attempts to address this issue by reviewing a number of examples of coarse ...
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(2002)A new genus of the family Ideliidae, Tshekardelia media gen. et sp. nov., is described from the locality of Tshekarda, the Lower Permian of the Ural Mountains. The species Sylvidelia latipennis Martynov, 1940, is redescribed.
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(2003)The great bulk of massive sulfide deposits in the Urals are related to Paleozoic basalt-rhyolite and basalt-andesite-dacite-rhyolite volcanic rock associations of ensimatic island arcs. According to Ivanov and Loginov [1], ...
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(2003)Assessing the impacts of climatic and, in particular, land use changes on rates of soil erosion by water is the objective of many national and international research projects. However, over the last decades, most research ...
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(2001)In the middle Miocene Badenian gypsum basin of the Carpathian Foredeep, west Ukraine, three main zones of gypsum development occur in the peripheral parts of the basin. Zone I consists entirely of stromatolitic gypsum ...
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(1996)The growth inhibiting and habit modifying effect of phosphonic acid derivatives (HEDP, ENTMP) and carboxylates (tartrate, citrate) on gypsum was investigated by in-situ Scanning Force Microscopy (SFM). Kinetic and morphological ...
Now showing items 5228-5247 of 21879