Analysis of reason for two movements of solenoid valve when valve opens;

,original works or secondary works,compiled works or deductive works,literature works or works of art,factual works or functional works,which determines the judgment of originality.

By means of constructing mathematical morphology filter,the binary image composed by allelic genes of chromosome is filtered and the problem that deals with the action times of voltage regulating devices for compensation is turned into filtering problem of discrete binary image.

Aiming at the problem of the action times of switching equipment in voltage/reactive power optimization for high and medium voltage distribution networks,a real time voltage/reactive power optimization methods based on the modified particle swarm optimization is presented.

To ascertain the feasibility of the quick formation of the granules in the EGSB reactor seeded with digestion sludge and the possibility of the quick startup of the other EGSB reactors,the primary and the secondary start-up operations of the EGSB reactor were investigated.

The secondary start-up,using methanol as electron donor and nitrite as electron acceptor,was completed within 46 days in the USB reactor,which was inoculated nitrite denitrifying granular sludge that had been deposited under 0~4 ℃ for two months.

Based on the experiment on the secondary start-up of the UASB reactor that had stopped working 8 months,this study mainly explored the affecting factors of the secondary start-up of the UASB reactor employed in the low-concentration domestic wastewater.

Using digital simulation,the mining-induced stress distribution in the entry with large mining height and second weight is analyzed,a optimum support scheme is choosed by perpendicular design.