When the reflectivity goes beyond 4 5%,the alternation of the aromatic ring polymerization and the aromatic layer superposition is the effective evolutional mechanism of high rank coal, which promotes constantly the coal rank to be higher.

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.