When the stream is collisional , the negative energy nature changes to negative dissipative nature .
流束存在碰撞时，负能性质改变为负耗散性质。
The bohm criterion of the sheath in the multicomponent electronegative collisional plasma is developed with a two-fluid model . It is discussed that different charge particles affect the bohm criterion for the sheath of a one-dimensional stationary plasma .
