海南宝石级红锆石的组成及某些谱学特征研究

本研究中,采用电子探针、中子活化、红外和顺磁共振等手段,系统测定了海南砂矿中的宝石级红锆石。得出结论,宝石级红锆石纯度很高,是典型的晶质而并非变生晶体。 红锆石的红、红褐色,是由于480—500nm范围的色心吸收引起。该色心的形成与红锆石中的U、Th和REE含量有关。Fe~(3+)造成红锆石的黄色。室温下测出的7条ESR精细结构谱线属于Gd~(3+)的。而同时得出的超精细结构谱线由空穴心造成。     

Investigating the ENSO prediction skills of the Beijing Climate Center climate prediction system version 2

The El Ni?o-Southern Oscillation(ENSO) ensemble prediction skills of the Beijing Climate Center(BCC) climate prediction system version 2(BCC-CPS2) are examined for the period from 1991 to 2018. The upper-limit ENSO predictability of this system is quantified by measuring its “potential” predictability using information-based metrics, whereas the actual prediction skill is evaluated using deterministic and probabilistic skill measures.Results show that:(1) In general, the current operational BCC ...