The angle between the major transmission direction of one polarizer and the fast(or slow) axis of the wave-plate is 45°,the polarizer and the wave-plate are fixed together to form a standard circular polarizer which is controlled by the stepper motor to chan.

It is introduced briefly the modification way and result of lignosulphonate(LS) as coal-water slurry(CWS) additive and determination of the adsorption film thicknesses of the LS and modified lignosulphonate(MLS) on the smooth surface of coal and microscopic slide by the method of elliptical polarization.

By discussing the problem of superposition of two linear polarized beams which are of the same frequency,of random vibrating directions and of the constant phase difference,the general expression of the coherent conditions and elliptical polarization is obtained.

In wire-cutting manufacturing of the top and bottom different curve,accomplishing cutting way of ellipse bias changing curved surface which between two plane curve into developable surface in order to calculate NC program of four axis ganging.

In view of the application of calculation formulae on clamping force of circular eccentric,this paper presents classification by self locking degree and corresponding calculation of clamping force.

By applying the circular eccentric clamping bodies clamping force formula,This paper brings forward the dif- ferent levels of classification of the self-locking round eccentric,and clamping force calculations.

Analysis of the force in circularly-eccentric sheave clamping system;