Using a randomized experiment that we designed for the 2021 Chinese General Social Survey,this study conducts a conjoint analysis to explore the fertility potential among Chinese adults.We examine the separate impacts...Using a randomized experiment that we designed for the 2021 Chinese General Social Survey,this study conducts a conjoint analysis to explore the fertility potential among Chinese adults.We examine the separate impacts of different factors and their heterogeneity across social groups.The results suggest that fertility potential is context-dependent.In addition,greater economic resources and availability of childcare significantly increase fertility potential.However,preferences in terms of the care provider,family versus the market,vary by gender,educational level,and desired number of children.Notably,we also find that son preference no longer has a significant effect on fertility potential in China.In light of China’s current low fertility,our study suggests that childbearing behavior will become increasingly differentiated by socioeconomic status.Fertility-enhancing policies should focus on supplementing economic resources and improving access to childcare.展开更多
Since the implementation of several pilot production tests were in natural gas hydrate(NGH) reservoirs in terrestrial and marine settings, the study of NGH has entered a new stage of technological development for indu...Since the implementation of several pilot production tests were in natural gas hydrate(NGH) reservoirs in terrestrial and marine settings, the study of NGH has entered a new stage of technological development for industrial exploitation. Prior to the industrial exploitation of any given NGH reservoir, the economic feasibility should be examined. The first step of economic evaluation of a NGH reservoir is to know whether its resource amount meets the requirement for industrial exploitation. Unfortunately, few relevant studies have been conducted in this regard. In this study, the net present value(NPV) method is employed to estimate the economic critical resources required for the industrial exploitation of NGHs under different production scenarios. Sensitivity analysis is also performed in order to specify the effects of key factors, such as the number of production wells, gas price, technological improvement and tax incentive, on the economic critical resources. The results indicate that China requires the lowest economic critical resource for a NGH reservoir to be industrially exploited, ranging from 3.62 to 24.02 billion m3 methane. Changes in gas price and tax incentives also play significant roles in affecting the threshold and timeline for the industrial exploitation of NGH.展开更多
Based on the teaching practice of mineral resources economics,this article believes that a certain economic foundation is an indispensable condition for learning mineral resource economics well for the students of geo...Based on the teaching practice of mineral resources economics,this article believes that a certain economic foundation is an indispensable condition for learning mineral resource economics well for the students of geology majors,and the teaching content of mineral resources economics must include the basic knowledge of economics;Mining resource management is an indispensable content for constructing a knowledge system of economic analysis and evaluation of mineral resources.The teaching content of mineral resource economics should include the sustainable use of mineral resources and the environmental protection.In order to meet the needs of society,the teaching content of mineral resources economics must be updated in time.展开更多
In the economic analysis framework,natural resources and environmental factors are included in the category of capital or land.Hence,the explanatory variables of the production function only include capital,labor and ...In the economic analysis framework,natural resources and environmental factors are included in the category of capital or land.Hence,the explanatory variables of the production function only include capital,labor and the residue term technology.Such framework may be designed for methodological reasons,but it is展开更多
Based on the analysis of present situation of ecological circular agriculture development in Zhejiang Province, the problems of limited resources, backward technology and capital shortage were proposed, and the soluti...Based on the analysis of present situation of ecological circular agriculture development in Zhejiang Province, the problems of limited resources, backward technology and capital shortage were proposed, and the solutions were put forward to promote the construction of modem agriculture industry system and accelerate the change from the traditional agriculture model to ecological circular agriculture model, such as choosing suitable development models according to local conditions, promoting the construction of agricultural demonstration zones, improving ecological technology, and strengthening the comprehensive utilization of resources and farming system innovation.展开更多
文摘Using a randomized experiment that we designed for the 2021 Chinese General Social Survey,this study conducts a conjoint analysis to explore the fertility potential among Chinese adults.We examine the separate impacts of different factors and their heterogeneity across social groups.The results suggest that fertility potential is context-dependent.In addition,greater economic resources and availability of childcare significantly increase fertility potential.However,preferences in terms of the care provider,family versus the market,vary by gender,educational level,and desired number of children.Notably,we also find that son preference no longer has a significant effect on fertility potential in China.In light of China’s current low fertility,our study suggests that childbearing behavior will become increasingly differentiated by socioeconomic status.Fertility-enhancing policies should focus on supplementing economic resources and improving access to childcare.
基金the financial support provided by the Guangdong Major Project of Basic and Applied Basic Research(Grant No.2020B0301030003)supported by the Department of Science and Technology of Guangdong Province,as well as project(DD20221703)supported by the China Geological Survey。
文摘Since the implementation of several pilot production tests were in natural gas hydrate(NGH) reservoirs in terrestrial and marine settings, the study of NGH has entered a new stage of technological development for industrial exploitation. Prior to the industrial exploitation of any given NGH reservoir, the economic feasibility should be examined. The first step of economic evaluation of a NGH reservoir is to know whether its resource amount meets the requirement for industrial exploitation. Unfortunately, few relevant studies have been conducted in this regard. In this study, the net present value(NPV) method is employed to estimate the economic critical resources required for the industrial exploitation of NGHs under different production scenarios. Sensitivity analysis is also performed in order to specify the effects of key factors, such as the number of production wells, gas price, technological improvement and tax incentive, on the economic critical resources. The results indicate that China requires the lowest economic critical resource for a NGH reservoir to be industrially exploited, ranging from 3.62 to 24.02 billion m3 methane. Changes in gas price and tax incentives also play significant roles in affecting the threshold and timeline for the industrial exploitation of NGH.
文摘Based on the teaching practice of mineral resources economics,this article believes that a certain economic foundation is an indispensable condition for learning mineral resource economics well for the students of geology majors,and the teaching content of mineral resources economics must include the basic knowledge of economics;Mining resource management is an indispensable content for constructing a knowledge system of economic analysis and evaluation of mineral resources.The teaching content of mineral resource economics should include the sustainable use of mineral resources and the environmental protection.In order to meet the needs of society,the teaching content of mineral resources economics must be updated in time.
文摘In the economic analysis framework,natural resources and environmental factors are included in the category of capital or land.Hence,the explanatory variables of the production function only include capital,labor and the residue term technology.Such framework may be designed for methodological reasons,but it is
基金Supported by Major Science and Technology Project (Priority Themes) of Zhejiang Province,China
文摘Based on the analysis of present situation of ecological circular agriculture development in Zhejiang Province, the problems of limited resources, backward technology and capital shortage were proposed, and the solutions were put forward to promote the construction of modem agriculture industry system and accelerate the change from the traditional agriculture model to ecological circular agriculture model, such as choosing suitable development models according to local conditions, promoting the construction of agricultural demonstration zones, improving ecological technology, and strengthening the comprehensive utilization of resources and farming system innovation.