Browsing by Title
- DSpace Home
- →
- Browsing by Title
JavaScript is disabled for your browser. Some features of this site may not work without it.
Browsing by Title
Now showing items 15825-15844 of 39126
-
(2002)A theoretical model of spectral-induced polarization (IP) of sand is presented. In the proposed model, contacts of sand grains and intergrain solution-filled space are considered as electrical current passages of varying ...
-
(2003)Predicting the behavior of volatile organic compounds in soils or sediments is necessary for managing their use and designing appropriate remedial systems to eliminate potential threats to the environment, particularly the ...
-
(2000)Recent laboratory experiments by Halgedahl and Ye (1999) show that domain widths in pyrrhotite change very little, or not at all, as a grain is mechanically thinned along one or two directions. In their experiments, particles ...
-
(2003)Equilibrium chlorine-isotope (37Cl/35Cl) fractionations have been determined by using published vibrational spectra and force-field modeling to calculate reduced partition function ratios for Cl-isotope exchange. Ab initio ...
-
(2004)Equilibrium Cr-isotope (^(53)Cr/^(52)Cr) fractionations are calculated using published vibrational spectra and both empirical and ab initio force-field models. Reduced partition function ratios for chromium isotope exchange, ...
-
(2001)The magnitude and direction of equilibrium iron-isotope (54Fe–56Fe) fractionations among simple iron-bearing complexes and α-Fe metal are calculated using a combination of force-field modeling and existing infrared, Raman, ...
-
(2001)Fluid-fluid interfacial areas play important roles in numerous subsurface processes such as dissolution, volatilization, and adsorption. Integral expressions have been derived to estimate both entrapped (discontinuous) and ...
-
(2001)Illustrative calculations are presented of the effect of the coupling of large groups of Earth's normal modes in a realistic 3-D earth model. In previous work the effect of modal splitting and coupling has been treated ...
-
(2005)The magnitude of equilibrium iron isotope fractionation between Fe(H2O)63+ and Fe(H2O) 62+ is calculated using density functional theory (DFT) and compared to prior theoretical and experimental results. DFT is a quantum ...
-
(2001)The cis-vacant configurations of smectites and illites have been studied theoretically by using transferable empirical interatomic potentials. A wide range of compositions of octahedral and tetrahedral cation and interlayer ...
-
(1998)Surface protonation is the most fundamental adsorption process of geochemical interest. Yet remarkably little is known about protonation of mineral surfaces at temperatures greater than 25°C. Experimentally derived standard ...
-
(1996)The equilibrium constants for surface protonation of solid oxides and silicates can be estimated from theoretical considerations and known properties of the solids for use in the constant capacitance, diffuse double layer ...
-
(1992)A theoretical model of the solubility of the assemblage bertrandite/phenakite + topaz + quartz during formation of epithermal Be-ores related to topaz rhyolites (e.g., Spor Mountain, Utah) has been developed. Available ...
-
(IOP Publishing, 2016)Comprehensive study of the chemical and gas composition, temperatures, levels, pressure of deep underground water in deep wells is associated with the beginning of the systematic development of the oil and gas potential ...
-
(1988)We describe a method of modeling body waves in anisotropic media of arbitrary symmetry, which can be used to reduce the solution of steady-state problems to integrals with respect to the horizontal wave slowness that contain ...
-
(2000)This paper provides ready-to-use equations to describe variations in uranium-series (U-series) disequilibrium as a function of elemental distribution coefficients, melting porosity, melting rate, and melting time. The ...
-
(2003)The adsorption of alkali metal cations on a hydroxylated corundum surface was investigated using high-level electronic structure calculations, with both cluster Hartree–Fock and periodic density-functional theory approaches. ...
-
(1993)The ratios Na/Li, K/Li, Na/Cs and K/Cs have been calculated for exchange equilibria among the Li and Cs silicates spodumene, petalite, eucryptite, and pollucite, and the alkali feldspars albite and K-feldspar plus quartz, ...
-
(1999)Ab initio quantum mechanical calculations were performed on Al(OH) 3 , Al(OH)- 4 , NaAl(OH) 4 and related species with varying numbers of explicit water molecules to elucidate the structural, spectral and energetic properties ...
-
(1997)In the absence of sulfide, As hydroxide complexes are the major As containing species in hydrothermal solution. As (III) hydroxides are dominant, except under highly oxidizing conditions. In neutral and acid pH at low ...
Now showing items 15825-15844 of 39126