The research on optimum population appraisal of Center District of Lanzhou adopts scenarios analysis,measueing the city s appropriate scale and maximal population scale from the aspects of land space,water supply,greenland norms,GDP and ecological footprint.

Temporal and Spatial Variations of Ozone Concentration and Its Relations with Meteorological Factors in Lanzhou Proper;

Evaluation on Spacial Difference of Guangzhou Downtown Living Environment;