Objective To evaluate the mass deworming effects in intestinal nematodiasis control.

After the brief introduction of OELD about its device structure,work principle and fabrication process,the paper expounds systemically the research progress in the organic luminous materials,OELD display panel and its driving technology.

The development of driving technology urges the stepping motor system to become more widely used.

AC servo heavy duty driving technology is a new dynamical driving technology which develops on the base of common AC servo driving technology in recent years.

Application of polymer flooding technology in Daqing Oilfield;

Surfactants are of most important in alkali-surfactant-polymer flooding technology.

Polymer flooding technology enhances oil recovery by increasing the sweep efficiency of water.

On the basis of analyzing the development trend of permanent-magnet AC servo system,the research state of permanent-magnet AC servo system s control strategy,position detection and identification,main circuit, drive technique and communication network technique and so on were focused on.

The cost reduction and high quality picture can be achieved by using various PDP drive techniques.

This article introduced emphatically the control strategy,position detection and identification,drive technique as well as main circuit of permanent magnet Ac servo system.