含硫化氢喷气燃料中噻二唑衍生物的缓蚀性能

研究了2,5-二巯基-1,3,4-噻二唑（ DMTD ）和5-甲基-2-巯基-1,3,4-噻二唑（ MMTD）在含H2 S喷气燃料中的缓蚀性能．银片腐蚀试验表明：对比未加剂喷气燃料,加入40 mg/L噻二唑衍生物后,银片的抗腐蚀性能显著增强．电化学测试表明：添加噻二唑衍生物明显降低了阴、阳极极化腐蚀电流密度,且MMTD的缓蚀效果优于DMTD．非接触式三维表面轮廓仪和扫描电子显微镜分别分析了银片在未加剂和加剂溶液中腐蚀表面,可明显的看出,噻二唑衍生物在银片表面形成了保护膜,有效阻止H2 S与银片的接触,从而减缓腐蚀．     

一种二相码信号多普勒补偿方法的研究与实现

针对相位编码信号脉冲压缩技术中存在的多普勒失配问题,提出并实现一种基于数字动目标检测(DMTD)的二相码信号多普勒补偿方法.该方法通过DM TD分离不同速度目标的回波,然后对不同速度通道的回波信号进行相应的多普勒补偿,矫正了多普勒失配问题.对速度模糊情况下的多普勒补偿进行了研究,进一步扩展了多普勒补偿的频率范围.该方法已应用于某新型雷达信号处理机的研制,其有效性得到证实.     

The adsorption of 2,5-dimer-capto-1,3,4-thiadiazole (DMTD) on copper surface and its binding behavior

The interaction mechanism of 2,5-dimercapto- 1,3,4-thiadiazole (DMTD) on copper surface was studied by surface-enhanced Raman scattering (SERS), infrared (IR) and X-ray photoelectron spectroscopy (XPS) techniques. The SERS spectra were obtained. We found that DMTD bound with the copper via its two-excocyclic mercapto groups. The monosulphide salt was formed. At the same time, DMTD coordinated with the Cu⁺ ion through the excocyclic mercapto groups and polymerized via the Cu⁺ ion into a one- dimensional polymer chain on the copper surface.