Laboratory- scale experiments were conducted to determine new technology of waste sludge facultative metabolism . 10-L laboratory-scale facultative reactors wer
The most popular and traditional method to analyze the source of economic growth is created by Robert. M.Solow, but it has some localizations and is not very pr
During the period of May to October in 1999, systematical studies were given to the rate of decomposition of Calamagrostis angustifolia litter, the phosphorus c
China is a country with a long history of agricultural development, the tradition of bureaucratic administration and economic management systems for the social