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Since the 19th National Congress of the Communist Party of China proposed the implementation of the rural revitalization strategy, the development of rural children’s sports and cultural life has received much attention. Based on the new development stage, this paper focuses on the changes in rural children’s...

Star sensor is an important part of the attitude control of a space vehicle. The advantages and disadvantages of the optical system determine the accuracy of the whole star sensor system. In order to adapt to the development of China's space needs, a star sensor optical system was designed by a domestic...

The immobilization of lactase is a more attractive approach to overcome the disadvantage of the free lactase. In the presented work magnetic Fe304 fluid was synthesized by chemical coprecipitation and its surface was modified with sodium oleate. Then the liquid paraffin was used as dispersant and glutaraldehyde...