Damping leakage layer has been adopted in terminal air distributing unit of airclean system An idea of damping leakage was obtained from another train of thought by which the filtrating air,uniformizing flow and caulking leakage of terinal unit has been decoupled It can damp leakage and change airflow easily,effectively and economically It is a new idea of air distributing uni

The results show that by fiting a shoveling tape device, with the addition of the spray lead alloys or blocking alloys, the problems can be satisfactorily resolved.

Formulates the concept and theoretical method of air distribution for clean rooms with leakage preventing layer, which decouple filtration, sealing and air distribution actions of a high efficiency filter.

Measuring the leakage impedance on both of the primary and secondary windings of the transformer by short circuit test, and a new mathematical model of microprocessor-based protection for transformer is proposed based on the principle of constant leakage impedance.

The output characteristic of non impedance matching balance traction transformer is deduced by employing the theory of multiwinding transformer and with considering the leakage impedance of windings.