Synthesis of large diamond crystals containing high-nitrogen concentration at high pressure and high temperature using Ni-based solvent by temperature gradient method

This paper reprots that with Ni-based catalyst/solvent and with a dopant of NaN₃, large green single crystal diamonds with perfect shape are successfully synthesized by temperature gradient method under high pressure and high temperature in a China-type cubic anvil high-pressure apparatus (SPD-6×1200), and the highest nitrogen concentration reaches approximately 1214-1257 ppm calculated by infrared absorption spectra. The synthesis conditions are about 5.5 GPa and 1240-1300 ℃. The growth behaviour of diamond with high-nitrogen concentration is investigated in detail. The results show that, with increasing the content of NaN₃ added in synthesis system, the width of synthesis temperature region for growth high-quality diamonds becomes narrower, and the morphology of diamond crystal is changed from cube-octahedral to octahedral at same temperature and pressure, the crystal growth rate is slowed down, nevertheless, the nitrogen concentration doped in synthetic diamond increases.     

机载雷达立体影像定位方法的比较及改进

由于合成孔径雷达(SAR)具有全天候的成像能力,在地质、生态、水文、海冰和测绘等诸多领域有着广泛的应用。主要研究了雷达立体影像对获取地面三维坐标的方法,分析了目前所广泛使用的三种立体定位模型的优缺点,为利用雷达立体影像对获取数字高程模型提供了选择依据,并对其中的零距离-多普勒模型进行了改进,最后利用机载雷达影像数据对此算法进行了实验研究,取得了较好的实验结果。