Land Subsidence Control Zone and Policy for the Environmental Protection of Shanghai.

Land subsidence was once a major geo-hazard in the city of Shanghai, China. From 1921 to 1965, the maximum cumulative land subsidence in the urban areas of China reached 2.6 m.

[Study on ingredients of essential oils of Curcuma wenyujin extracted by supercritical-CO2 fluid extraction and steam distillation].

Objective: To compare the ingredients of essential oils of Curcuma wenyujin extracted by supercritical-CO2 fluid extraction and by steam distillation.

Method: GC-MS was applied in this experiment.

Result: The ingredients and physical and chemical properties of essential oils of C.