It Probed into the effect of concentration explosive limits caused by the nature of explosive gases, the damping effect of polybasic Gas caused by CO, as well as the conjunct oxidative and inductive effect .

Based on numerical results of impacted roof movement at four stages which have been verified in-situ, the damping effects of roof movement at the impacted stage with three-dimensional distinct element code and chaotic dynamics theory are studied.

This work has systematically studied the damping effect of some other gases on the branch chain explosion of polybasic explosive mixture gas of H 2, CO and CH 4.

The existence and characteristics of dynatron effect in the components and parts of several appara- tus have been studied and proved in this paper.

Based on the research on the characteristic of the dynatron component and parts of an apparatus, the concept of dynatron effect was educed, and the engendering mode and principle was discussed.

Aimed at the chucking phenomena happened when the common water hydraulic piston friction pairs work,the double damping effect piston friction pairs based on the hydraulic supporting principle were presented and the anti-chucking and flow rate characteristics were analyzed.

The results showed that the films have near negative resistance effect which is found more obvious between layers than on film surface,and the interlayer resistivity is higher than surface resistivity.