Improved hydrogen desorption properties of Co-doped Li<Subscript>2</Subscript>BNH<Subscript>6</Subscript>

The hydrogen desorption properties of Li 2 BNH 6 were improved by doping with cobalt. With the addition of CoCl 2 (7 wt%), more than 8 wt% of hydrogen was released from Li 2 BNH 6 at temperatures below 210°C, which is approximately 90°C lower than that of pristine Li 2 BNH 6 . X-ray diffraction, Fourier transform-infrared and Raman characterizations revealed that the dehydrogenation was a stepwise process with the formation of intermediates Li 4 BN 3 H 10 and LiBH 4 and final products of Li 3 BN 2 and LiH. The introduction of Co greatly accelerated the dehydrogenation of Li 4 BN 3 H 10 . X-ray absorption near-edge structure measurements revealed that Co and CoB species formed during ball milling of CoCl 2 with LiBH 4 and LiNH 2 , which may function as catalyst in the subsequent dehydrogenation.     

高空钠激光导星的制备与成像研究

本文在首先分析了高空钠层光谱特性和激光光谱的基础上,提出要获得最大激光导星回波信号,激光频率与钠原子频率应满足的匹配关系.采用智能化激光锁频的方式实现了钠层激光导星的制备,采用成像望远镜和单反相机,获得了钠层激光导星图像.同时,借助于激光雷达这一有利工具,获得了钠导星制备与成像中的激光能量、回波光子数等重要参考数据.     

The first observation of the atmospheric tides in the mesosphere and lower thermosphere over Hainan,China

Fuke (19.5°N, 109.1°E) meteor radar is the first radar of the low latitudes of China, which is used to detect the wind in the meso- sphere and lower thermosphere. In this paper, by using the wind data near three months (1 February-20 April, 2009), we first present the variation of the atmospheric diurnal tide, semidiurnal tide and mean wind in the height range 80-100 km over the low latitudes of China. The results from our analysis are summarized below. During spring months, there are quite strong tides in ...     

重力反演预测乌伦古地区泥岩分布

准噶尔盆地乌伦古地区石炭系碳质泥岩广泛发育,对该区烃源岩研究有重大意义。通过对重力资料场源分离和界面反演,获取了石炭系泥岩的深度、厚度及范围,有效指导了乌伦古地区烃源岩研究。