《概率论与数理统计》教学改革研究

针对概率论与数理统计课程的特点,以经济管理类专业的学生为对象,提出了概率论与数理统计课程教学改革的几点建议．     

Nafion膜在直接甲醇燃料电池中的应用及改进

Nafion质子交换膜性能优越,广泛应用于固体聚合物燃料电池中,但因存在甲醇渗透问题,使其在直接甲醇燃料电池中的应用受限制。本文讨论了Nafion质子交换膜的物质传输机理,侧重介绍甲醇分子的渗透机理,综述了基于降低甲醇渗透率而对Nafion膜所做的改进性研究和几种具有应用前景的替代膜。     

Polymer electrolytes based on acrylonitrile-butadiene-styrene copolymer

One of the approaches to improving the ionic conductivity and the mechanical strength of a solid polymer electrolyte is to use polymers in modified forms, such as polymer blends, copolymers and cross-linked polymers. In this study, a new polymer electrolyte based on the acrylonitrile-butadiene-styrene (ABS) copolymer has been prepared. The ionic conductivity, electrochemical stability and interfacial characteristics of the polymer electrolyte in contact with a lithium electrode have been investigated. The temperature dependence of the conductivity below 20 °C can be described by the Arrhenius equation, and above 20 °C by the VTF equation. Lithium passivation appeared to have taken place in the system. The conductivity and electrochemical characteristics of the system are somewhat similar to those of PAN-based polymer electrolytes. Received: 9 December 1998 / Accepted: 9 March 1999     

离子色谱法测量休闲食品中的柠檬酸盐

建立了离子色谱法测定休闲食品中柠檬酸和柠檬酸盐含量的方法。采用标准曲线法定量,柠檬酸浓度在1.0~20.0 μg/mL的范围内,线性方程为y=0.049 9x-0.017 4,线性相关系数为0.998 2,方法的检出限为0.015 μg/mL,加标回收率为96.9%~101.6%,方法具有简单、快速、重现性好等优点。     

Carbon cloth supported lithiophilic carbon nanotubes@Ag skeleton for lithium anode via ultrafast Joule heating method

Journal of Solid State Electrochemistry - Regulating lithium deposition and stripping behavior during cycles is critical for constructing high-performance and stable lithium metal anodes (LMAs)....     

Effect of FePO4 coating on structure and electrochemical performance of Li1.2Ni0.13Co0.13Mn0.54O2 as cathode material for Li-ion batteries

Journal of Solid State Electrochemistry - In this work, Li1.2Ni0.13Co0.13Mn0.54O2 was prepared by the sol–gel method and coated with FePO4. The experimental results show that the material...     

Economical cobalt-free single-crystal LiNi0.6Mn0.4O2 cathodes for high-performance lithium-ion batteries

Journal of Solid State Electrochemistry - With the scarcity of cobalt resources and soaring prices, the removal of cobalt from nickel-rich layered cathodes is now a priority to reduce the material...