The reservoir quality of the Upper Triassic Chang 6 formation of Sanyan regions in north Shaanxi Province is typical low porosity and the lowest permeability.

Although water has the central function of the bloodstream in the biosphere,especially in arid or semi-arid regions such as Yan'an region in Northwest China,yet very limited attention is paid to the role of the water-related processes in ecosystem.

In this article,choose Yan'an region as an example,adopt the methods of ecological security and ecological footprint,and evaluate the sustainability of region development.

Study and Application of the Fracturing Fluid for low-Temperature, Shallow Wells in Yanchuan Area;

In the Yanbian area 4393 examples women the syphilis infects the preventive measure which the distribution situation and the suggestion adopts;

Assumption of Conservation Tillage Technology Extension in Yanbian Area;

Superiority of constructing Lavender angustifolia planting base in Yanbian area;

In this paper,five issues of 11 agricultural counties in Yan an area are studied,which include the total area change of farmland and seeding;the change of planting structure;the change of agricultural investment;the total and average output changes of grain and oil plants;the change of per farmer income per year.

U-Pb ages,Hf isotope and trace element compositions of captured zircons of the Paleocene adakites in the Yanji area,NE China:Implications for magmatic evolution of intermediate-felsic magmas;