ZrO_2（Y_2O_3）超细粉末的性能及其在定氧传感器上的应用

用共沉淀法制备ＺｒＯ２（Ｙ２Ｏ３）超细粉末，在其它工艺相同的条件下，研究了粉末焙烧温度对粉末颗粒度、线性热膨胀和导热性能的影响，证明１２００℃焙烧的粉末制成的熔融金属定氧传感器测试性能最好

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^