This paper puts forward an idea of using genetic algorithms to solve the problem of low power factor at no load and light load with asynchronous motor and the possibility of power factor optimization is testified in theory.

The results of the optimum recording power measurement indicate the optimum writing power is about 7 mW.

Firstly the power optimization and design method for the combined coil is introduced, then a technical approach to ensure the uniformity of its magnetic field is analyzed.

In this method, power optimizations between source and relay nodes and between different sub-carriers of OFDM system are separated into two different optimization processes.

In this method,power optimization between source and relay nodes and between different sub-carriers of OFDM system are separated into two different optimization processes.

Principle and approach to improve power factor of induction furnace of intermediate frequency;

Design and experiment of high power factor converter on arc welding inverter power source;

The Method of Group-Control for Electronic Ballasting of the High Power Factor;

The designing of switch power source high power factors converter;

Methods are explored to improve power factors of ion membrane of the rectifying device through control of the conduction angles.

By analysing the short net power factors and electricity pressure lowered of silicon furnace,it expounds the influences to efficency of voltage trans-ferance and production electricity consumption caused by short net function,it also discusses the method of improving short net funtions and achivements made.