弯曲光纤的辐射特性分析

随着光纤技术的飞速发展,光纤链路的安全性受到了极大的挑战。为了对光纤链路的安全状况作一定性分析,根据一种天线模型对单模光纤的弯曲辐射功率进行了理论推导,并对单模光纤的弯曲辐射功率随弯曲半径和探测器面积的变化情况做了仿真模拟,给出了分析结果。结果表明,对弯曲光纤实施窃听是完全有可能的。     

Ba—Nd—Cu—O体系的高温超导电性

Since the discovery of high Tc superconductivity in La-Ba-Cu-O system,great progress of research on high Tc superconductivity in oxides have beenmade. Up to now, almost all rare earth elements Lave been substitutedsystems except Ba-(Ce, Pr, Tb)-Cu-O are found to be superconductors whichunually have much higher Tc than in La-Ba-Cu-O. Many experimental results