Equation Icon  βP h4p ∑ sin u ∕u 𝒯s (t,z) = − -------s --------------j--j-------2--[1 − exp(− t∕τs,j)]cos(κjz ) (5.53 ) 8πKa2 j (1 + sin (2uj )∕2uj)(γ2s + uj)2