Equation Icon  ∂-- ∂tnc + ∇ ⋅ (ncv ) = 0, (237 ) ( 2 2 2√ --) m ∂-v + ∇ mv---+ Vext(t,x ) + κnc − ℏ--∇-√--nc = 0. (238 ) ∂t 2 2m nc