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Browsing ELibrary by Title
Now showing items 1267-1286 of 21821
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(2002)Artificial recharge of groundwater is achieved by putting surface water in basins, furrows, ditches, or other facilities where it infiltrates into the soil and moves downward to recharge aquifers. Artificial recharge is ...
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(2004)The Middle Eocene fauna of the Khaichin-Ula II locality is shown to include four artiodactyl species assigned to three genera of three families of the suborder Suiformes: Helohyidae, Dichobunidae, and Raoellidae. Three ...
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(1995)Experimental brackets on As-Sb partitioning between polybasite-pearceite {Pbp; (Cu, Ag)16(Sb, As)2S11} and pyrargyrite-proustite {Ppr; (Cu, Ag)3(Sb, As)S3}, and between pyrargyrite-proustite, and miargyrite and smithite ...
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(2000)A database of 86 Permian brachiopod families, 411 genera and 1931 species of the Asian-western Pacific region was analysed using a range of statistical measures to unravel the changing patterns of diversity, origination ...
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(1997)An age of 250 (+/-70) yr is estimated for a specimen of the colonial anemone Gerardia collected alive from 630 m depth off the Bahamas. This age is calculated from (1) the difference in aspartic acid (Asp) racemization ...
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(1990)Intrastratal combustion is a heat treatment of petroliferous strats in order to enhance the oil recovery from them. The heat is produced in the pay stratum itself, by combustion of some of its oil. An oxidizing agent ...
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(2002)The Marmara Sea is situated between the world's largest permanently anoxic basin, the Black Sea, and an enclosed marginal sea, the Aegean Sea, which experienced quasi-periodic sapropel deposition since Miocene time. It is ...
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(2004)A suite of nickel, cobalt, iron, copper, and zinc containing sulfides are assayed for the promotion of a model carbon fixation reaction with relevance to local reducing environments of the early Earth. The assay tests the ...
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(2001)In the system CaO-MgO-FeO-Fe2O3-TiO2-SiO2, equilibria among titanite, pyroxene(s), olivine, spinel phase, ilmenite, and quartz constrain fo2, T, aSiO2, aTiO2, aFe, and the compositional variables, μTiFe2+Fe3+-2, μCa(Mg,Fe)-1, ...
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(2004)Laboratory experiments on the branching, symbiont-bearing coral genus Porites and Acropora have been carried out to determine the dependence of the skeletal boron isotopic composition (δ11B) on the pH of seawater. The ...
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(2003)The economic evaluation of diamond-bearing kimberlites is usually carried out in four stages. Expenditure tends to increase by an order of magnitude at each successive stage. At the end of each stage, the sample results ...
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(2006)Plant litter decomposition plays a fundamental role in carbon and nitrogen cycles, provides key nutrients to the soil environment and represents a potentially large positive feedback to atmospheric CO2. However, the full ...
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(2000)Homogeneity in 41K/39K among Earth, Moon, chondrites, and achondrites has been cited as evidence that evaporation of protoplanetary dust could not have caused variability in the mass of moderately volatile elements among ...
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(2004)Accelerated biotic turnover during the Late Triassic has led to the perception of an end-Triassic mass extinction event, now regarded as one of the ‘‘big five’’ extinctions. Close examination of the fossil record reveals ...
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(1996)Though many studies on the Mg contents in the calcitic tests of foraminifers exist, the processes controlling its uptake are still a matter of debate. Laboratory cultures offer an excellent opportunity to reveal these ...
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(2001)Thermochemical sulfate reduction (TSR) is a process observed in some gas and oil reservoirs above a temperature about 120-145°C. During this process, petroleum compounds such as methane react with anhydrite to form calcite, ...
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(2003)Assessment of the glaucophane substitution, [M4]Ca + [VI]Mg ↔ [M4]Na + [VI]Al, along the Ga and F analogue of the tremolite-glaucophane join, □Ca2Mg5Si8O22F2-□Na2Mg3Ga2Si8O22F2 (= F-Ga-glauc), was conducted at 900 °C and ...
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(2001)The geoelectrical structure of the Earth's mantle is estimated to a depth of 1000 km on the basis of comprehensive use of data from magnetovariation sounding (obtained at the Ukrainian geomagnetic observatories in Korets ...
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ASSESSMENT OF DIRECT TRANSFER AND RESUSPENSION OF PARTICLES DURING TURBID FLOODS AT A KARSTIC SPRING (2003)Turbid water can be the source of important sanitary problems in karstic regions. It is the case of the Pays de Caux, in Haute Normandie, where the main resource in drinking water is provided by the chalk aquifer. In the ...
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(2003)Analytical errors calculated for individual spot 206Pb/238U measurements of zircon analyzed using high mass resolution secondary ion mass spectrometry (HR-SIMS, e.g., SHRIMP II) were assessed using natural zircon (z6266) ...
Now showing items 1267-1286 of 21821