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ΦS (x) = − -q-U (x,x ′)∂αr − ---q--U (x,x ′′)∂ αradv + -q-U;α(x,x′) + q-U;α′(x,x′)uα′∂αu α 2r2 2radv2 2r 2r --q-- ′′ --q-- ′′ α′′ 1- ′ 1- ′′ + 2r U;α(x,x ) + 2r U;α′′(x,x )u ∂αv + 2 qV (x, x)∂ αu − 2qV (x,x )∂ αv ad∫vv adv − 1q ∇ αV (x,z)d τ, (413 ) 2 u