From analysis the word of TianXin in the bamboo book of The GuoDian Chu tomb ,this paper prove TianXin is Big Dipper which had been very near the northern celestial pole in remote age .

To study the effect of the change in formation pressure on porosity and permeability in the low permeability oil-gas reservoirs,the lab experiment together with theoretical method is used to study the stress sensitivity of the natural cores from Wendong,Zhongyuan Oilfield at both surface and formation conditions.

Through conventional water flooding experiment and NMR experiment, combining them with core analysis, the results of reverse flooding experiment after conventional water flooding on artificial core and natural core are studied respectively.

A case study on the transformation of the community landscape construction of Tianxin District in Changsha is made in this paper to discuss the way to transform the construction of old cities under the conditions of geographic and environmental changes.

Ultrafast time_resolved fluorescence experiments have been performed with core antennas CP43 and CP47 of PS Ⅱ.

As the third body, some perturbing bodies are nearer to the central body than the moving one, others are on the contrary, so the former are called the inner perturbing bodies and the latter the outer perturbing bodies.