文献计量视角下半导体材料SiC和GaN研究态势

Based on bibliometric, national and international research output within 2000~2018 of the third generation of semiconductor material SiC and GaN was collected. Analysis and studies were made in the region of time distribution, research forces and research hotspots. The general international development tendency and scientific research level in China were also discussed. Meanwhile, study directions clustering and burst key words detecting were used to discover and explain the inner law of evolutionary in this field, especially in the different research focus of various development stages. This paper could also provide a reference on research and arrangement in further studies.     

Neptune多接收器等离子体质谱精确测定锶同位素组成

报道了近两年来在Neptune多接收器等离子体质谱(MC-ICP-MS)上对NIST SRM987的测试结果。针对实际地质样品,Neptune MC-ICP-MS和热电离质谱(TIMS)进行了平行测定。Neptune MC-ICP-MS可以精确测定锶同位素组成,与传统的TIMS相比,MC-ICP-MS可以获得与TIMS相媲美的数据精度,而且分析时间短,效率高。对于等离子体载气———氩气中少量氪的干扰,可以直接扣除;对于样品中少量铷(Rb/Sr<0.01)的干扰,同样可以直接扣除,从而获得准确的锶同位素组成。     

多元素X射线荧光分析方法在山东郭城金矿成矿预测中的应用

以山东省海阳市郭城金矿为例 ,对使用 HAD- 51 2型多元素 X射线荧光仪进行金矿成矿预测的技术方法、参数设置、资料处理、异常解释等方面进行了系统地研究 ,并把现场测量成果与地质研究密切结合 ,指导成矿预测 ,取得了良好效果     

多元素X射线荧光分析方法在山东郭城金矿成矿预测中的应用

以山东省海阳市郭城金矿为例。对使用HAD-512型多元素X射线黄光仪进行金矿戚矿顶测的技术方法、参数设置、资料处理、异常解释等方面进行了系统地研究,并把现场测量成果与地质研究密切结合,指导成矿预测,取得了良好效果。