The sample preparation by the filter paper method and the direct determination of major (thulium)and five neighbouring micro-rare earth element impurities in pure thulium oxide by XRF are described.
本文拟定了一种采用滤纸片法制样，X射线荧光直接测定纯氧化铥中氧化铥主量以及氧化钬、氧化铒、氧化镱、氧化镥和氧化钇等稀土杂质含量的分析方法。
In this paper, We have studied the method of unseparate the matrix and direct determination of impurities in pure indium by inductively coupled plasma mass spectrometry(ICP-MS).
研究建立了不分离基体元素，直接采用电感耦合等离子体质谱法测定精铟中的杂质元素的方法。
The direct problem was solved by DRBEM, which eliminated the drawback of domain integral for classical boundary element method and resulted in pure boundary integral calculation.
正问题采用双倒易边界元法求解，该法避免了传统边界元法需进行区域积分的缺点，仅需纯边界积分计算。
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