kf1 L R k_x2 D kr1 kx2 R kt C kx2 R C k_x2 k_x1 ke D Vs kr1 C k_x2 2 k_x1 D krec Ri kf1 L kx2 C kt R kt R C krec kdeg Ri 2 D R_initial kappaE 2 D R_initial KD kf1 0.01 kr1