Environmental issues are one of the most important aspects of the long-term development of a country and have an important role in a nation＇s wealth. Different environmental performance indicators present different m...Environmental issues are one of the most important aspects of the long-term development of a country and have an important role in a nation＇s wealth. Different environmental performance indicators present different methodologies and aim to measure countries＇ environmental performances with different approaches. One of the environmental indices, Environmental Performance Index （EPI）, ranks countries＇ performance on high-priority environmental issues in two areas： protection of human health and protection of ecosystems. The purpose of this paper is to discuss the environmental aspect of sustainability with the EPI and analyze the relationships and differences of the chosen 14 （seven are developed and seven are emerging） countries＇ EPI scores and Gross Domestic Products （GDPs）.展开更多
This paper first estimated the infectious capacity of COVID-19 based on the time series evolution data of confirmed cases in multiple countries. Then, a method to infer the cross-regional spread speed of COVID-19 was ...This paper first estimated the infectious capacity of COVID-19 based on the time series evolution data of confirmed cases in multiple countries. Then, a method to infer the cross-regional spread speed of COVID-19 was introduced in this paper, which took the gross domestic product(GDP) of each region as one of the factors that affect the spread speed of COVID-19 and studied the relationship between the GDP and the infection density of each region(China's Mainland, the United States, and EU countries). In addition, the geographic distance between regions was also considered in this method and the effect of geographic distance on the spread speed of COVID-19 was studied. Studies have shown that the probability of mutual infection of these two regions decreases with increasing geographic distance. Therefore, this paper proposed an epidemic disease spread index based on GDP and geographic distance to quantify the spread speed of COVID-19 in a region. The analysis results showed a strong correlation between the epidemic disease spread index in a region and the number of confirmed cases. This finding provides reasonable suggestions for the control of epidemics. Strengthening the control measures in regions with higher epidemic disease spread index can effectively control the spread of epidemics.展开更多
文摘Environmental issues are one of the most important aspects of the long-term development of a country and have an important role in a nation＇s wealth. Different environmental performance indicators present different methodologies and aim to measure countries＇ environmental performances with different approaches. One of the environmental indices, Environmental Performance Index （EPI）, ranks countries＇ performance on high-priority environmental issues in two areas： protection of human health and protection of ecosystems. The purpose of this paper is to discuss the environmental aspect of sustainability with the EPI and analyze the relationships and differences of the chosen 14 （seven are developed and seven are emerging） countries＇ EPI scores and Gross Domestic Products （GDPs）.
基金Project supported by the National Natural Science Foundation of China (Grant Nos.62266030 and 61863025)International S & T Cooperation Projects of Gansu province (Grant No.144WCGA166)Longyuan Young Innovation Talents and the Doctoral Foundation of LUT。
文摘This paper first estimated the infectious capacity of COVID-19 based on the time series evolution data of confirmed cases in multiple countries. Then, a method to infer the cross-regional spread speed of COVID-19 was introduced in this paper, which took the gross domestic product(GDP) of each region as one of the factors that affect the spread speed of COVID-19 and studied the relationship between the GDP and the infection density of each region(China's Mainland, the United States, and EU countries). In addition, the geographic distance between regions was also considered in this method and the effect of geographic distance on the spread speed of COVID-19 was studied. Studies have shown that the probability of mutual infection of these two regions decreases with increasing geographic distance. Therefore, this paper proposed an epidemic disease spread index based on GDP and geographic distance to quantify the spread speed of COVID-19 in a region. The analysis results showed a strong correlation between the epidemic disease spread index in a region and the number of confirmed cases. This finding provides reasonable suggestions for the control of epidemics. Strengthening the control measures in regions with higher epidemic disease spread index can effectively control the spread of epidemics.
