本文介绍了一种由水热生长的MnCo_(2)O_(4)(MCO)纳米线以及随后电沉积的NiCoMnS_(4)(NCMS)纳米片组成的高性能超级电容器电极材料,即泡沫镍上生长的MCO@NCMS.由于其多孔和互联的纳米结构以及MCO和NCMS的协同效应,在1 mA cm^(-2)处实现了...本文介绍了一种由水热生长的MnCo_(2)O_(4)(MCO)纳米线以及随后电沉积的NiCoMnS_(4)(NCMS)纳米片组成的高性能超级电容器电极材料,即泡沫镍上生长的MCO@NCMS.由于其多孔和互联的纳米结构以及MCO和NCMS的协同效应,在1 mA cm^(-2)处实现了12,020.8 mF cm^(-2)的高电容,并展现出良好的倍率性能以及循环稳定性.电化学测试表明,组装成的水性非对称超级电容器在0.800 mW cm^(-2)的功率密度下,达到0.611 mW h cm^(-2)的高能量密度并具有良好的循环稳定性,即在15,000次充放电循环后,容量保持率可达90%,且保持100%的库仑效率.展开更多
Purpose-The purpose of the paper is to investigate the impact of various types of intergovernmental fiscal transfers on local public education expenditure at the county level in China and to estimate the leakage of ca...Purpose-The purpose of the paper is to investigate the impact of various types of intergovernmental fiscal transfers on local public education expenditure at the county level in China and to estimate the leakage of categorical subsidies for rural compulsory education.Design/Approach/Methods-It is a quantitative study.The paper constructs a quantile regression model and adopt data collected in 2007 for 1,985 counties in China to examine the impact of relevant fiscal transfers.Findings-The results reveal that most intergovernmental fiscal transfers exert a substitution effect on the local education expenditure,whereas subsidies for rural compulsory education from the Central Government have a crowding-out effect on education investments from local financial resources.Although the subsidy program generally narrows the education expenditure disparity across counties,there are heterogeneous effects across different regions.Originality/Value-The paper estimates and compares the impact of fiscal transfers on both the level and disparity of local public education in different regions,and provides a possible explanation for the crowding-out effect of fiscal transfers in China.展开更多
基金supported by the Natural Science Foundation of Gansu,China(20JR10RA611 and 22YF7GA009)the Fundamental Research Funds for the Central Universities(lzujbky-2021-sp54)。
文摘本文介绍了一种由水热生长的MnCo_(2)O_(4)(MCO)纳米线以及随后电沉积的NiCoMnS_(4)(NCMS)纳米片组成的高性能超级电容器电极材料,即泡沫镍上生长的MCO@NCMS.由于其多孔和互联的纳米结构以及MCO和NCMS的协同效应,在1 mA cm^(-2)处实现了12,020.8 mF cm^(-2)的高电容,并展现出良好的倍率性能以及循环稳定性.电化学测试表明,组装成的水性非对称超级电容器在0.800 mW cm^(-2)的功率密度下,达到0.611 mW h cm^(-2)的高能量密度并具有良好的循环稳定性,即在15,000次充放电循环后,容量保持率可达90%,且保持100%的库仑效率.
基金This work has been supported by the National Social Science Foundation of China in Education(Grant No.:BFA140039).
文摘Purpose-The purpose of the paper is to investigate the impact of various types of intergovernmental fiscal transfers on local public education expenditure at the county level in China and to estimate the leakage of categorical subsidies for rural compulsory education.Design/Approach/Methods-It is a quantitative study.The paper constructs a quantile regression model and adopt data collected in 2007 for 1,985 counties in China to examine the impact of relevant fiscal transfers.Findings-The results reveal that most intergovernmental fiscal transfers exert a substitution effect on the local education expenditure,whereas subsidies for rural compulsory education from the Central Government have a crowding-out effect on education investments from local financial resources.Although the subsidy program generally narrows the education expenditure disparity across counties,there are heterogeneous effects across different regions.Originality/Value-The paper estimates and compares the impact of fiscal transfers on both the level and disparity of local public education in different regions,and provides a possible explanation for the crowding-out effect of fiscal transfers in China.
