Based on central difference scheme, explicit upwind scheme, Samarskii scheme and modified Dennis scheme, some new alternating group explicit methods and alternating direction explicit methods are constructed for solving convection diffusion equation.

Study on sludge reduction by aerobic/anaerobic alternation and circulation methods;

The ECP-1 electronic variable painting can produce marvelons dreamy vesult, it is controled by electronic circuit to make the colourful light alternation display on painting background.

Numerical simulation of near-miscible flooding of water alternating gas considered hysteresis effect;

Study on process for plant extraction intensified by solvent displacement;

The long slim tube test shows that at low gas liquid ratio, the blocking pressure difference between inlet and outlet of slim tube increases more slowly and the bigger alternate slug is, the worse the block effect.

This article introduces the water-cut reducing and stimulation mechanism of nitrogen injection as well as its field application in Xianhe fault-block oilfield by using different injection means such as nitrogen soak, nitrogen-water alternating flooding and foam flooding.