T矩阵散射模拟双偏振测雨雷达偏振及衰减特性

通过T矩阵散射模拟,研究X、C和S波段双偏振测雨雷达在单分散雨滴谱、不同雨强和不同最大雨滴直径下的偏振和雨区衰减特性,分别建立三种不同波段双偏振雷达反射率因子和差分反射率的雨区衰减订正关系.最后,用实测雨滴谱数据和X波段双偏振雷达实测反射率数据验证散射模拟结果的准确性.     

Photocurrent Measurement of Si1-xGex/SiMultiple Quantum Wells With Ion Implantation and Thermal Annealing

Si-Ge interdiffusion in Si1-xGex/Si multiple quantum-wells (MQW) is investigated by photocurrent spectroscopy, which is induced by ion implantation of Si+ and thermal annealing. The band gap energy of the Si1-xGex/Si samples implanted plus annealed has a blue shift up to 97meV compared to the annealed-only samples. The blue shift may be caused by the SiGe interdiffusion and the relaxation of the SiGe quantum wells.