微电极在 Ni(OH)_2 使用寿命测定中的应用

采用粉末微电极技术，通过循环伏安法对Ｎｉ（ＯＨ）２使用寿命的测定进行了研究．通过控制微电极孔穴深度，使电极过程不受液相扩散控制，从而提高了电极的充放电电流．在电极循环过程中，放电峰电流随着循环次数而变化，从而反映出电极的循环性能．在每次循环扫描过程中，充电深度达到７５％，能够满足常规检测的要求．对含Ｃｏ与不含Ｃｏ两种Ｎｉ（ＯＨ）２的检测结果说明，Ｃｏ有利于延长Ｎｉ（ＯＨ）２的寿命，这一点与已往的结论是相符的．应用这一技术，完成一次测试所需时间不到１０ｈ．这种方法对于研究Ｎｉ（ＯＨ）２掺杂元素对寿命的影响是非常快速而有效的．     

Interface bond mechanisms of ceramic-cemented carbide compact insert

Conclusion Ceramic-cemented carbide compact inserts have been developed by hot-pressing sintering techniques, the upper part of the compact insert is of Al₂O₃ + TiB₂ ceramic material, while the base part of the compact insert is of WC + Co cemented carbide. The compact insert makes full use of the advantages of the high hardness of ceramic materials and the high strength of cemented carbide, and its mechanical properties are just between that of Al₂O₃ + TiB₂ and WC + Co. SEM, XRD and electron microprobe analysis showed that element diffusion and formation of new phases are the main causes for the bond of Al₂O₃ + TiB₂ with WC + Co in the interface.     

短柄泥蜂属一新种记述(膜翅目:泥蜂总科:短柄泥蜂科)

本文记述了泥蜂总科Sphecoidea短柄泥蜂科Pemphredonidae短柄泥蜂属Pemphredon Latreille一新种:赵氏短柄泥蜂Pemphredon chaoi Li et He,sp. nov. 模式标本保存在中国科学院动物研究所。