promethium

基本解釋

My father found that promethium orb 20 years ago...
我父親在20年前找到的這顆珠子...
The heat stabilities and transparencies of stearates of rare earth metals except scandium and promethium used as heat stabilizers as PVC were studied.
研究了鈧、钷外其他稀土金屬硬脂酸皂對PVC熱穩(wěn)定作用。結(jié)果表明:它們均屬長期型熱穩(wěn)定劑,與少量硬脂酸鋅并用可有效改善其抑制PVC初期著色的效能;
The discovery of prometheum is presented in detail and emphasis is put on the important role of the ion exchange method in separating and identifying promethium.
本文詳細(xì)及正確地介紹了放射性元素钷的發(fā)現(xiàn)史,特別強(qiáng)調(diào)了離子交換技術(shù)在钷的分離及鑒定中的重要作用。
Keywords promethium;aquatic ecosystem;dynamics.;
钷;水域生態(tài)系;動(dòng)力學(xué);