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into the crystal by metallic bond, which is a mixing bond of un-saturated covalent electronic bond, free electronic bond and magnetic electronic bond. Therefore, there exist covalent electrons(nc), near-free......
of Richards equation of variably saturated flow[J]. Rock and Soil Mech, 2012, 33(S1): 237-243. [19] VanGenuchten M T. A closed-form equation for predicting the hydraulic conductivity of un-saturated soils[J......