1. The detector system of the two-axis neutron powder diffractometer at the Heavy Water Research Reactor of China Institute of Atomic Energy was improved by increasing the number of detectors from one to four and by installing the third Soller collimators with horizontal divergence of 20''.
通过将探测器的数目由1个增加到4个、用水平发散角为20''的Soller准直器取代30''的单缝准直器，对中国原子能科学研究院重水研究堆旁的二轴中子粉末衍射谱仪进行了改进。
2. The structural transformation of the symmetric icosahedron is strongly related to the initial configuration, atomic number and atomic distribution, and can be controlled by doping hetero atoms and changing their compositions and distributions.
匀称的20面体结构转变与团簇的初始结构、原子数和组元分布密切相关。而且，这种相变可以通过不同物性组元的添加、含量和原子分布的改变进行控制。