Then the formula of relation between light-wavelength change and tangential and radial velocity of light source is presented and the conclusions listed below are reached: (1)The light-wavelength change is determined together by tangential and radial velocity of light source; (2)Doppler effect is a special case of above-mentioned formula, (3)When the radi.

On the basis of radial velocity membership determination method, while the distribution of surface-number-density of galaxies in cluster regions is concerned s imultaneously, we calculate the distribution parameters and membership probabilities of individual galaxies for 8 Abell clusters.

The hydraulic wander is the key equipment for hoisting mineral and personnel in mine,its sitting comfort as well as the conveyer efficiency and safety ,is the main factor to decided the velocity curve ,but often be ignored or not be considered in design.

The excellence and defect of various velocity curves are compared through timing process.

Based on the mathematics model of velocity curve for elevator, the computer simulation for the velocity curve has been developed, and according to the simulating data, ideal velocity curve of the system controlled by PLC could be obtained with digital methods.

An easy realizing method of speed curve of elevator;

According to the protective speed curves, the tracking measuring function of infrared laser position transducer is applied for back-up protection of travel speed.

The design method of 4 floor elevator model is introduced ,it is focus on the structure of the model,the setting of main registering signal ,outer calling signal and elevator well signal, speed curve setting and operating, and design of its PLC control system, and so on, the basic function of all centralized alternative elevator has been run on the model.