The micro-confined groundwater was discovered in some parts of the Chengdu Plain.

Based on summarizing harms of microartesian to construction,the authors analyzed stability of foundation under the influence of micro-artesian and confined water seepage,especially the passive earth pressure on the bracing.

On the difference between the friction type connection and pressure-bearing type connection with high-strength bolts;

Contraposing the problem in the opening mechanism of electrolytic tank,a new pressure-bearing quick opening mechanism which can be used in desooption electrolytic tank has been developed.

Automatic calculation contributing to the matched size of miniature bearing;

Autonomous manufacturing island model and miniature bearing production;

In view of actualities that the internal bore of precision miniature bearing below 2mm is difficult to grind conventionally,the spark grinding of the internal bore is realized initially by adopting two-rod backup structure,increasing the amplitude and the velocity of reciprocating oscillation during process and changing the quasi parameters of electric gauge reasonably.