The water source of the water diversion project from the Hanjiang River to the Weihe River is one of the most important drinking water sources in China. Its water quality is related to the water safety of the long-distance water diversion system from the Hanjiang to Weihe Rivers. In order to explore the spatiotemporal change trend of the water environment characteristics of the water source area and analyze the key factors that have a greater impact on it, this study collected 9 types of water environment physical and chemical parameters from 10 water quality monitoring sections from 2017 to 2019; the water environment characteristics of the water source area of the water diversion system from the Hanjiang River to the Weihe River were analyzed and evaluated by using the variance analysis method, the hierarchical cluster analysis method and the water quality identification index evaluation method. The results were as follows. (1) There was spatiotemporal heterogeneity in a number of ph
TAIYUAN, Dec. 28 (Xinhua) The Qinshui coalbed methane field in north China Shanxi Province, the largest of its kind in the country, produced 6 million cubic
Upgrading the traditional rubbing craft which can only be applied to flat surface, Li Renqing, born in 1963 in Xinyang of Central China's Henan province, has been working for a whole life on rubbings of high relief cultural relics, making the once impossible task a mature craft.
This combo photo taken on Nov. 17, 2022 shows high relief rubbings by Li Renqing. Making rubbings for tablet inscriptions is a craft with a history of over 1,000 years in China, invented as a way to copy documents even before the art of printing.