Relation between infilling patterns of short-term base-level cycle and macroscopic reservoir heterogeneity-taking Chang6 to Chang7 turbidite fan of Yanchang Formation in Longdong area as an example;

Sequence stratigraphic characteristics of the Yanchang Formation in the Longdong area and their significance for petroleum exploration;

Source analysis and depositional systems of Upper Triassic early and mid-term Yanchang Formation in Longdong area;

In the Northern Song Dynasty,Longdong region was situated in the border between the Northern Song and Xixia,and the government of the Northern Song attached much importance to the region.

The case is chosen in Longdong region which is one of typical mound county in Loess Plateau.

According to analysis of growth status and the observed climate data of alfalfa(Medicago sativa) sowed in the spring on the Loess Plateau of the East Gansu Province,the quantitative analysis of growth and development of alfalfa with the average temperature,the accumulated temperature and the precipitation was made.

The adjustment of agriculture and foresty structure is pressing in Longdong district.

Species and ecological distribution of honey bee in different habitats in eastern Gansu;

Sediment accumulation on the steep slope zone of the continental down-warped lacustrine basin and dynamics of sequence filling: An example from the Triassic Yanchang Formation in the Ordos Basin,eastern Gansu;