Application of γ Spectra Measurement in the Research of Lake Sediment and Palaeoenvironment

Xigeda Formation layer, which is widely distributed in Panzhihua area, is researched by the method of γ spectrum measurement. Qinglongshan Xigeda Formation profile is measured by the low-background multi-channelγenergy spectrometer in Panzhihua, the change rules of radioactive elements, including URa, Th, K, Ir and Ira on the profile are analyzed in detail. The characteristics and palaeoenvironmental significance of the sediment layer on the profile is researched by combining the geological features. The results show that the contents of radioactive elements in Xigeda Formation profile reduce obviously from the old to the new layer and change regularly and the radioactive characteristics are consistent to the sediment geological features. All these show that the γ spectrum method is a good one for the study of lake sediment and palaeoenvironment.

Process Optimization of Cake Oriented Screw-Pressing of Jatropha curcas

Jatropha curcas from Panzhihua area was used to explore the optimal process of screw-pressing. And the result shows the optimal process parameters are as follows: the water content of kernel is 3%; the ratio of kernel to shell is 8:2; the temperature of the mixture of kernel and shell entering the pressing chamber is 100°C; the temperature of the pressing chamber is 170°C; and the corresponding oil yield is 87.8958%.