A mean field limit of the contact process in a random environment with large range;

Frequency conversion control system of long stroke non-beam pumping unit based on PLC;

Optimum design of a long stroke variable torque pumping unit and simulation of its dynamic behaviors.;

The speculation of the crank chain drive mobile wheel pumping unit with long stroke;

This paper describes the typical long flow technique and short flow technique in iron and steel metallurgy,explains the necessity of reconstructing Chinese short flow for domestic iron and steel industry according to the practical condition of lack of natural gas at home,presents several new short flow modes suitable for China.

At last,the best design project,driving mechanism of the single hydraulic cylinder with long stroke,was determined.

The paper analyzed the necessity to research and develop the drilling rig with mechanical top drive and long stroke feeding by hydraulic control,presented the problems of the drilling rig with new type mechanical top drive,introduced XL-5 drilling rig in structure form,parameter,characteristic and the development test.

Microstructure and in-situ growth process of insulating films on TiNi shape memory alloys;

Analysis on the Growth Process of Rare Plants Cercidiphyllum japonicum;

Analysis on the growth process of Acronychia pedunculata in Baiyunshan Resort;