In Internet environment,is the theory of traditional mass communication "spiral of silence" still applicable? By analyzing the theory of the spiral of silence and the characteristics of the internet communication,a conclusion that the spiral of silence will not sink in internet age is drawn.

Optimization design method to determine submergence depth of sucker rod pump;

Designing the submergence depth of sucker rod pump with curve fitting;

Nowadays,the submergence depth of sucker rod pumping wells in Tahe oilfield of Northwest Oilfield Company is much beyond the average value of other oilfields in SINOPEC.

In this paper rational flowing pressure, submerging pressure and .

Galvanized sheets have been applied widely in our life, but there are many problems of the lifetime and molten zinc corrosion of the sink roll in CGL.

According to the development of hot dip galvanizing technology without sink roll, the principles and methods are emphasized and the comparison of these methods are also presented.

It is put forward that with the application of this technique, the impulse frequency can be adjusted arbitrarily with the change of the production of the pumping well unit, submergence depth and liquids feed capacity of oil layers to ensure the high effective operation.

Unreasonable submergence depth of rod pumped wells will influence the pump efficiency and bottom hole flowing pressure.