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Now showing items 2195-2214 of 39124
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(2005)The fractionation of the isotopes of Mo between different geological environments has recently been determined to high accuracy using mass spectrometry (Barling et al., 2001). Fractionation is observed between Mo in seawater, ...
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(2004)17O NMR shieldings are calculated for the central O in the molecular model OM6(OH)12-2, for crystalline alkaline earth oxides, MO, where M=Mg, Ca, and Sr, using both Hartree-Fock and hybrid Hartree-Fock density-functional ...
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(2004)The existence of ether or ester-like complexes of silicate with organic compounds has long been debated in the literature on biological utilization of silicon. Comparison of theoretically calculated 29Si NMR chemical shifts ...
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(2000)A computing scheme for estimating the isothermal increments of main thermodynamic characteristics of gases under the geobarometrical conditions of the Earth's crust and upper mantle has been developed. An FGL unit built ...
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(2002)Patterns of dike swarms around volcanic centers or above mantle plumes are interpreted by a mechanical analysis of regional and dike-induced stresses, in which dike emplacement is controlled and guided by the stress state. ...
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(2003)In many parts of the world the frequency of river floods (flash floods) seems to have increased during the past half century. Intensified agriculture is considered as a possible cause for the changed peak flow behavior. ...
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(2001)Destruction of rocks under shock load action has been considered. In this case, it is necessary to predict propagation of crack at known external load. The prediction is possible in case of calculation of stressed state ...
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(2001)The movement of fluids in the crust and upper mantle not only lead to important mineral reactions but also play an essential role in the geochemical cycling of elements and in controlling global change. Numerous papers ...
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(2004)Theory is derived from the work of Urey (Urey H. C. [1947] The thermodynamic properties of isotopic substances. J. Chem. Soc. 562–581) to calculate equilibrium constants commonly used in geochemical equilibrium and ...
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(2002)The increment method is applied to calculation of oxygen isotope fractionation factors for common magmatic rocks. The 18O-enrichment degree of the different compositions of magmatic rocks is evaluated by the oxygen isotope ...
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(1991)A theoretical model calculating the thermodynamic isotope factors of oxygen in metal oxides of geochemical interest is presented for temperatures between 0 and 1200-degrees-C on the basis of the modified increment method. ...
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(1998)Thermodynamic calculation of partial melting of peridotite using the MELTS algorithm has the potential to aid understanding of a wide range of problems related to mantle melting. We review the methodology of MELTS calculations ...
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(2001)The objectives of this study are to: assess the regional contribution of outcrop-scale structures in well-exposed rocks of a tectonic province; and evaluate how failure to measure this scale of structure affects the ...
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CALCULATION OF STRESSED STATE OF ROCKS TAKING INTO ACCOUNT SEQUENCE OF THE FILLING MASS CONSTRUCTION (2001)Methods of determining the stresses in rock mass have been considered. Influence of various factors on the stresses has been discussed. Method of evaluating the sequence of development of the mining and filling operation ...
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(2006)The increment method has been successfully applied to calculate thermodynamic isotope fractionation factors of oxygen in silicates, oxides, carbonates, and sulfates. In this paper, we modified the increment method to ...
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(1999)Methodology for the calculation of 13C NMR shieldings on molecular organic fragments, representative of monomers in a type III kerogen, is presented. Geometry optimization of each molecular fragment was carried out using ...
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(1995)13C NMR shieldings have been calculated using the random-phase-approximation, localized-orbital local-origins version of ab initio coupled Hartree-Fock perturbation theory for CO2 and and for several complexes formed by ...
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(2000)The composition of solid precipitated from cooling magma is calculated from chemical differentiation profiles and an incompatible element monitor of fractionation. In a period of cooling, magma evolves to a derivative ...
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(2003)Recent experimental studies have reported the existence of two new Sb sulfide species, Sb2S52− and Sb2S62−, in alkaline sulfidic solutions in equilibrium with stibnite, Sb2S3, and orthorhombic S. These species contain ...
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(2001)The standard molal thermodynamic properties and heat capacity power function coefficients of more than 100 organic sulfur compounds in the crystalline, liquid, and/or gas state have been calculated by combining regressions ...
Now showing items 2195-2214 of 39124