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Browsing ELibrary by Title
Now showing items 11054-11073 of 21879
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(2001)Flows at the top of the Earth's core generating the observed geomagnetic secular variation (SV) can be deduced in the frozen-flux approximation with various non-uniqueness-reducing assumptions such as tangential geostrophy ...
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(2003)A new approach is presented for the simulation of steady-state groundwater flow in multi-aquifer systems that contain many cylindrical inhomogeneities. The hydraulic conductivity of all aquifers and the resistance of all ...
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(2001)The one-dimensional pressure head profile above a fixed water-table was studied for different steady infiltration rates. As shown in previous studies, when the infiltration rate (qin) is less than the soil saturated hydraulic ...
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(2003)Measurements of the concentrations of the 238U decay series isotopes (234U, 230Th, 226Ra) have been used to estimate the rates at which magma is generated and transported in the mantle. The usual assumption is that solid ...
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(2003)Numerous single-hole and cross-hole pneumatic injection tests have been conducted in unsaturated fractured tuff at the Apache Leap Research Site (ALRS) near Superior, Arizona. Steady-state analyses of single-hole tests ...
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(2003)This paper reports an investigation of the effects of a trihydroxamate siderophore, desferrioxamine B (DFO-B), and a common biological ligand, oxalate, on the steady-state dissolution of goethite at pH 5 and 25 °C. The ...
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(2002)Progress in development of thermodynamically based models of silicate equilibria with explicit entropy budgets has motivated a reexamination of the conclusion of McKenzie (Journal of Petrology 25, 713–765, 1984) that ...
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(1996)A laboratory column containing aquifer sand was used to study biogeochemical processes occurring in groundwater. As a carbon source for the microbially mediated processes, lactate was introduced into the system.To describe ...
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(2000)Serial data from column experiments were used to develop a dynamic model to describe the evolution of concentration profiles of redox-sensitive chemical components such as iron(II), sulfate/sulfide, FeOOH(s), and FeS(s). ...
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(2006)The intensity of biogenic sediment mixing is often expressed as a "biodiffusion coefficient" (Db), quantified by fitting a diffusive model of bioturbation to vertical profiles of particle-bound radioisotopes. The biodiffusion ...
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(1998)Primitive meteorites contain grains of stardust that originated from stellar outflows and supernova ejecta prior to the formation of the Solar System. The study of these grains in the laboratory provide new information on ...
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(2001)In the field of road construction and maintenance, the need for information on the thickness of very thin road layers is not satisfied by means of commercial pulse GPR, due to the inability of such devices to operate over ...
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(1997)Stepped-heating, for the stable isotope analysis of trace quantities of light elements (such as C, N and H) has evolved from a technique used solely for the separation of components of different isotopic composition. By ...
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(2003)Most geostatistical studies consider multiple-related variables. These relationships often show complex features such as nonlinearity, heteroscedasticity, and mineralogical or other constraints. These features are not ...
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STEREOLOGICAL AND OTHER METHODS APPLIED TO ROCK JOINT SIZE ESTIMATION-DOES CROFTON'S THEOREM APPLY? (2003)A number of authors concerned with the analysis of rock jointing have used the idea that the joint areal or diametral distribution can be linked to the trace length distribution through a theorem attributed to Crofton. ...
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(2001)Experiments were carried out measuring kaolinite dissolution rates using stirred and nonstirred flow-through reactors at pHs 2 to 4 and temperatures of 25°C, 50°C, and 70°C. The results show an increase of kaolinite ...
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(2002)Numerical models of mantle convection are presented that readily yield midocean ridge basalt (MORB) and oceanic island basalt (OIB) ages equaling or exceeding the apparent ~1.8-Ga lead isotopic ages of trace-element ...
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(1999)The paper discusses and compares application of several stochastic and deterministic methods for analysis of geological time-series, taking the δ18O record of the Pacific core V28-239 as a test object. The stochastic ...
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(2003)A Bayesian approach to characterize the predictive uncertainty in the delineation of time-related well capture zones in heterogeneous formations is presented and compared with the classical or non-Bayesian approach. The ...
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(2003)Since the previous hydraulic safety factor for gas containment in gas storage caverns did not consider the spatial hydraulic conductivity variation, which directly affects the variation of hydraulic head and gradient, it ...
Now showing items 11054-11073 of 21879