生态流域治理的居民支付意愿研究

以基于条件价值评估法(CVM)的1063份有效问卷为基础,研究了厦门市居民对九龙江生态治理的支付意愿及其影响因素。采用Spike模型,将拒绝支付者区分为真实零支付群体和抗议性群体,并在剔除抗议性群体后,利用剩下样本对支付意愿进行了Probit回归。估算了厦门市居民支付意愿的平均金额。结果表明:剔除抗议性群体对支付意愿的研究至关重要;厦门市户籍、受教育程度较高、个人年收入较高和环境认知度较高的居民,支付意愿较高;厦门市居民对九龙江生态治理支付意愿至少为每人每年50. 19元。要加强生态环境教育;改革流域生态补偿机制;改革九龙江流域水管制体制,探索建立私有产权体制;建立完善流域环境保护的法规以及标准体系;进一步落实流域保护的目标考核责任制。国家社会科学基金规划项目“中国绿色增长方式下大气污染治理的动力机制研究”(13BJL092);;福建省软科学项目“福建省‘生态美、百姓富’的生态实现模式及途径研究”(2016R0087

The Property Study of LiBOB-PC/DEC Electrolyte

合成锂离子电池新型电解质锂盐L iBOB,并与PC/DEC溶剂配成电解液.室温下研究了L iBOB-PC/DEC电解液电导率随锂盐浓度的变化规律及其用于L i/ARG电池充放电循环性能的最佳组成配比,为0.5mol.L-1L iBOB-PC/DEC(3∶7).应用交流阻抗和循环伏安法研究了该最佳电解液的电化学性质及其电极/界面状态,结果显示,石墨电极在这种电解液中可形成良好的SEI膜.The new electrolyte salt LiBOB for Li-ion battery was synthesized in laboratory,and series of electrolytes of LiBOB and PC/DEC was compounded.The conductivity of the electrolytes was compared by changing the temperature and concentration.The cycling performance of charging-discharging was also compared by the charging-discharging test,the results showed that the varying regularity of conductivities and cycling stability and capacity were not always identical,but there were a suitable electrolyte for Li/ARG cell.The A.C.impedance and CV were used to test the compatibility of the most suitable electrolyte and ARG anode.Conclusion can be drawn that the ARG anode can be protected very well by SEI film in 0.5 mol·L~(-1)LiBOB-PC/DEC(3∶7).作者联系地址：北京科技大学材料科学与工程学院无机非金属材料系,北京科技大学材料科学与工程学院无机非金属材料系,北京科技大学材料科学与工程学院无机非金属材料系,北京科技大学材料科学与工程学院无机非金属材料系 北京100083,北京100083,北京100083,北京100083Author's Address: Department of Inorganic Nonmetallic Materials,School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,Chin

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^