In order to obtain proper text information consistent with the users’ cognitive level, a new personalized retrieval method is proposed for the distant learners. At first the user’s personalized cognitive structure is established and this structure can represent the users’ cognitive level formally. Then related concept can be extended around the keywords, which usually reflect their focus of attention. How to extend depennd on the semantic distance which should be measured by some new formula in this article. At last these queried documents should be ranked according to the user’s cognitive level and the difficulty of the document containt. Experiments show that even if some different learners use the same keywords, the query result is consistent with their cognitive level respectively.

The paper defined the connotation of resource efficiency, and utilized the emergy theory and language to convert different resources which occured input, output and negative effects in the of regional economic system into the amount of the energy value of unified standards, and also established the econometric model of resource efficiency. The author scientifically explained and empirically analyzed the model utilizing emergy symbols, which provided a new theoretical models and methods for measuring resource efficiency.