By using a voltage gradient program, the eight aromatic amines were all separated well.

Adding a appropriate amount of SiO2 to ZnO ceramics leads to incrcase a value and voltage gradient of the varistor, to decrease leakage current and to raise withstanding surge current, that results in making ZnO varistors with excellent performance.

The AC flashover voltage, voltage gradient along the leakage distance, valid coefficient of creepage distance and the arc advancing path of polluted insulators are related to its materials and configuration.

Aim:To develop a type of multifunctional training exanining system of rats controlled by computer gradient voltage automatically driving rats and computer showing, recording and analysis experimental results at right moment.

The gradient voltage of electric power transformer under the action of lightning is analysed,and it is pointed out that theoretical analysis can only discover its regularity,and the structural data of longitudinal insulation of an actual coil should be checked and verified against experimental results.

A valid gradient method is employed to rank and choose projects with constraints of capital sources and management resources.

In this paper, the author queries the method of “use linear programming to find out optimum combination” put forward by management accounting; and then gives a convenient and reasonable method—valid gradient method.