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If the structure of a compound is known, the empirical bond valence - bond length correlation of Eq. 2 can be used to estimate the bond valences from their observed bond lengths. Eq. 1 can then be used to check that the structure is chemically valid; any deviation between the atomic valence and the bond valence sum needs to be accounted for.
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The total wave function is optimized using the variational method by varying the coefficients of the basis functions in the valence bond orbitals and the coefficients of the different spin functions. In other cases only a sub-set of all possible spin functions is used. Many valence bond methods use several sets of the valence bond orbitals.
Valence bond (VB) computer programs for modern valence bond calculations:-CRUNCH, by Gordon A. Gallup and his group. [1] GAMESS (UK), includes calculation of VB wave functions by the TURTLE code, due to J.H. van Lenthe. [2] GAMESS (US), has links to interface VB2000, and XMVB.
It is also commonly used to protect reinforcing bars (though being phased out as of 2005 [1]) and on a wide variety of piping connections, valves etc. [2] FBE coatings are thermoset polymer coatings. [3] They come under the category of protective coatings in paints and coating nomenclature.
In condensed matter physics, the resonating valence bond theory (RVB) is a theoretical model that attempts to describe high-temperature superconductivity, and in particular the superconductivity in cuprate compounds. It was first proposed by an American physicist P. W. Anderson and Indian theoretical physicist Ganapathy Baskaran in 1987.
Many such mixed-valence compounds absorb certain wavelengths of visible light resulting from intervalence charge transfer. In this case, orange-red light around 680 nanometers in wavelength is absorbed, and the reflected light appears blue as a result. Like most high-chroma pigments, Prussian blue cannot be accurately displayed on a computer ...
Starting in 2008, businessman John Tyczki entered into an agreement with Sherwin-Williams on the basis of assurances provided by Sherwin-Williams about its water-based paint products. When the products failed to live up to these assurances, causing ongoing problems for his business, Tyczki sued Sherwin-Williams and was awarded $2.88M. [70]