The basic properties of the dyadic stationary random processes are introduced,in- cluding dyadic continuity with derivative and the properties of the autocorrelation functions in the mean(i.

Decreasing fluctuation of shaft power,assuring polypropylene device running steady;

In order to revolve smoothly and steadily,save material energy,the author of this paper has reviewed the skip-hoist of cupola completely,according to his own design.