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yan an
Bleaching of sandstones in the northeast of Ordos Basin is mainly distributed in the Mesozoic Yan'an Formation.
      
Comprehensive study suggests that the gas leakage has occurred in the northeastern basin, which is responsible for bleaching of the sandstone on top of the Yan'an Formation.
      
The practice process is demonstrated by taking Yan'an region in northwestern China as a case.
      
Spatial-temporal differences in in-stream flow requirement based on GIS: A case study of Yan'an region, northern Shaanxi
      
The results show that: (1) According to the central streams in Yan'an region, mean annual in-stream flow requirement reaches 1.0619 billion m3, and the surface water for economic exploitation is 0.2445 billion m3.
      
She also travelled to the Communist base at Yan'an in 1936 and conducted a series of interviews, the result of which were a number of books.
      
The Yan'an days are remembered as the height of mass organizations.
      
 

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