China Economic Quarterly,2020,Vol 19,No. 01
We used the micro data of Chinese manufacturing enterprises during 2004–2007 to identify the effect of the implementation of Provisions on Minimum Wages on labor factor allocation efficiency, and then discussed the transmission mechanisms. Our empirical results show that the Provisions on Minimum Wages reduced labor factor allocation efficiency by 3.61%–5.71%, and this conclusion still holds when we relax the pseudo-randomness assumption of regression discontinuity design. Additionally, factors’ over-adjustment is an important channel through which Provisions on Minimum Wages reduced labor factor allocation efficiency.
Ecological Economy,2020,Vol 36,No. 01
The ecological crisis seriously threatens survival and safety of human, which is the greatest challenge human confronts in the 21st century. Constructing a community of shared future for mankind lays the foundation for ecological governance, and it could help solve specific problems with ecological pattern, reshape ecological order and promote innovation in ecological governance. On the basis of precisely elaborating value of constructing a community of shared future for mankind to ecological governance, countermeasures could be explored at the domestic and international level: focusing on the ecological crisis and exploring governance methods; constructing a system for global ecological governance and promoting overall development; reshaping ecological values and giving full play to advantages of socialist system featured by duty-undertaking; and further advancing green development and co-constructing better life.
Sociological Studies,2020,Vol 35,No. 01
This study examines the relationship between the early life experiences and the health status of the elderly from the perspective of life course. The study finds that unfavorable living conditions during childhood have a significant impact on the health status of the elderly, but the degree of influence is significantly modified by the current socioeconomic status of the elderly. When the elderly have high socioeconomic status, the impact of unfavorable living conditions during childhood is weakened, or even disappeared. This means that the current socioeconomic status has a significant compensatory effect on the unfavorable living conditions during childhood. For the elderly with lower socioeconomic status, the effects of unfavorable living conditions during childhood are not compensated by the current socioeconomic status. The two factors overlap and strengthen each other, resulting in serious health problems. In addition, cohort analysis finds that among the elderly with lower socioeconomic status, the impact of unfavorable living conditions during childhood is larger for the later birth cohorts than the earlier ones. This paper analyzes and discusses the transformation of diseases and health patterns in China and how changes of health care system in different historical periods affect individual life trajectories.
China Petroleum Exploration,2020,Vol 25,No. 01
As a typical representative of the continental fault basin in China, Jiyang depression has experienced three exploration stages from structure exploration of large anticlines, complex oil and gas accumulation belts to subtle oil and gas reservoirs. At present, exploration objectives in the Jiyang depression are more complex and subtle, which requires a finer degree of exploration research, deployment, and management. By strengthening the dynamic evaluation of remaining resource potential, continuously deepening the understandings of geological laws, and the research and application of exploration supporting technologies, scholars have carried out a fine evaluation of exploration targets in Shengli Oilfield to achieve the continuous and stable reserve increase in the Jiyang depression. This paper systematically summarizes the exploration practice in the Jiyang depression and presents “five fine and two innovative” exploration methods, which is of great theoretical and practical significance for the exploration and stable development of continental fault basins with high exploration degree in eastern China.
China Journal of Highway and Transport,2020,Vol 33,No. 06
For the precise and effective prevention of traffic accidents through preemptive warnings, an estimation method for the safety risk of urban road traffic is proposed based on driving behavior obtained from OBD data of vehicles and through information entropy theory. First, the relationship between locations with frequent abnormal driving behavior or places of traffic accidents was analyzed. Second, an estimation index system of the safety risk of road traffic was developed with road traffic safety entropy (RTSE) as the primary index and sudden acceleration and deceleration rates, sharp turning rate, speeding rate, and the rate of high-speed neutral taxiing as the secondary indexes. Thus, a calculation model of RTSE was developed based on the improved entropy weight method. Then, the number of safety levels of road traffic was determined through the combination of density clustering and K-means clustering. Furthermore, a method for calculating safety level thresholds was established through K-means clustering. The findings of the test results are in order. ① Locations with frequently abnormal driving behavior are consistent with the places traffic accidents. ② Modifications to the entropy weight method, such as optimization of selecting the base number of the logarithmic function, the processing of secondary indexes equal to zero, and the piecewise calculation of index weights can compensate for the limitation of the original logarithm with regard to entropy calculation with indexes equal to zero. In addition, it can avoid negative index weights and information inconformity between entropy values and index weights. ③ Two-step clustering may evade the influences of isolated data points on safety level division. A validation study was carried out on four urban roads in Chongqing with a total length of approximately 38 km. The results demonstrate that the RTSE is in accordance with the trend of the road safety state reflected by accidents, that the safety risk of road traffic can be divided into high and low levels, and that the optimal RTSE threshold is 0.042. Finally, the model achieves a risk division accuracy of 87.88%. This research can provide effective technical support for the identification of risky locations with regard to road traffic safety and preventing traffic accidents by providing preemptive warnings.