This thesis focuses Arsenic(As) distribution and occurrence in groundwater of Yangtze River Delta economic region, East China. 2019 groundwater samples were collected to analyze 26 chemical compositions, including As....This thesis focuses Arsenic(As) distribution and occurrence in groundwater of Yangtze River Delta economic region, East China. 2019 groundwater samples were collected to analyze 26 chemical compositions, including As. The Principal Component Analysis(PCA) was used to find out As source in groundwater. The results show that average As concentration in groundwater of this study is 9.33 μg/l, and maximum As concentration is up to 510 μg/l. The variation coefficient is 314.34%. High arsenic phreatic water(>10 μg/l) distributes along the Yangtze River and its estuary. Weak hydrodynamic conditions, wide p H value variation range and deteriorating environment are dominating factors, especially in Yangtze River Delta. The PCA suggests that arsenic in phreatic water is mainly of natural origin. Part of arsenic may directly originate from sediment organics and be related to organics decomposition.展开更多
In related academic circles, the research on port logistics industry and regional economic development has become a hot topic in recent years, and there are already extensive studies about this topic. Taking Ningbo Po...In related academic circles, the research on port logistics industry and regional economic development has become a hot topic in recent years, and there are already extensive studies about this topic. Taking Ningbo Port as an example, this paper analyzed its logistics development status, and discussed the existing problems. Besides, taking the time series data of Ningbo Port from 2007 to 2016 as sample data, and using the quantitative analysis methods such as correlation analysis and regression analysis, it systematically studied the interaction between the port development and regional economic development. Finally, on the basis of the problems, it came up with some recommendations.展开更多
There has been ongoing interest in China's economic growth.What were the drivers of China's economic growth in past years?What policies were used to promote China's economic growth?Although different lense...There has been ongoing interest in China's economic growth.What were the drivers of China's economic growth in past years?What policies were used to promote China's economic growth?Although different lenses may be used to understand and explain China's economic growth,this paper draws on historical,theoretical,and empirical perspectives to discuss the nexus between China's regional policies and economic growth.First,we review the evolution of China's regional policy and the policy's changing emphasis in different development stages,from balanced,unbalanced,and coordinated development to synergistic development.Then we construct a theoretical model to illustrate the impact of regional policy on the local economy and conduct an empirical examination with a case study of regional policy using regression discontinuity design.This paper analyzes the concept of regional policy and the underpinning logic of economic growth and presents practical approaches to formulate a better regional policyframework.展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 41302209)the National groundwater investigation project (Grant No.1212011121169)
文摘This thesis focuses Arsenic(As) distribution and occurrence in groundwater of Yangtze River Delta economic region, East China. 2019 groundwater samples were collected to analyze 26 chemical compositions, including As. The Principal Component Analysis(PCA) was used to find out As source in groundwater. The results show that average As concentration in groundwater of this study is 9.33 μg/l, and maximum As concentration is up to 510 μg/l. The variation coefficient is 314.34%. High arsenic phreatic water(>10 μg/l) distributes along the Yangtze River and its estuary. Weak hydrodynamic conditions, wide p H value variation range and deteriorating environment are dominating factors, especially in Yangtze River Delta. The PCA suggests that arsenic in phreatic water is mainly of natural origin. Part of arsenic may directly originate from sediment organics and be related to organics decomposition.
文摘In related academic circles, the research on port logistics industry and regional economic development has become a hot topic in recent years, and there are already extensive studies about this topic. Taking Ningbo Port as an example, this paper analyzed its logistics development status, and discussed the existing problems. Besides, taking the time series data of Ningbo Port from 2007 to 2016 as sample data, and using the quantitative analysis methods such as correlation analysis and regression analysis, it systematically studied the interaction between the port development and regional economic development. Finally, on the basis of the problems, it came up with some recommendations.
基金supported by the Fundamental Research Funds for the Central Universities,the Center for International Knowledge on Development,and the Department for International Development.
文摘There has been ongoing interest in China's economic growth.What were the drivers of China's economic growth in past years?What policies were used to promote China's economic growth?Although different lenses may be used to understand and explain China's economic growth,this paper draws on historical,theoretical,and empirical perspectives to discuss the nexus between China's regional policies and economic growth.First,we review the evolution of China's regional policy and the policy's changing emphasis in different development stages,from balanced,unbalanced,and coordinated development to synergistic development.Then we construct a theoretical model to illustrate the impact of regional policy on the local economy and conduct an empirical examination with a case study of regional policy using regression discontinuity design.This paper analyzes the concept of regional policy and the underpinning logic of economic growth and presents practical approaches to formulate a better regional policyframework.
