The theoretical analysis on bubble mass transfer process was made by the non reversible thermodynamics. Non steady state, steady state and equilibrium state and changing regulation were discussed.

运用不可逆热力学原理，对气泡传质过程进行了理论分析，讨论了非稳态、稳态、平衡态的差异及其变化规律。

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This paper introduces the principle of electromotor based on single chip computer 8051PWM, and the realization process of reversible control and non-reversible control.

介绍了基于单片机8051PWM 控制的电动机原理，阐述了8051与直流电动机构成的电机可逆控制和不可逆控制的实现过程。

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