This paper deals with the derivation of a formula developed empirically in a previous article. The equation allows the calculation of the average electrical conductivity of two-component random media over the whole range of fraction and a wide range of resistivity ratio of the components....

This work presents the results of numerical simulations concerning the electrical conductivity of two-component random resistor networks in d=3 as a model of composite media. Finite difference calculations have been carried out for several system sizes, conductance ratios and occupation numbers....