Rare-earth element, any member of the group of chemical elements consisting of three elements in Group 3 (scandium [Sc], yttrium [Y], and lanthanum [La]) and the first extended row of elements below the main body of the periodic table (cerium [Ce] throug
groundwater,rare earth elementsandheavy metals, have shown that science must operate [...] unesdoc.unesco.org unesdoc.unesco.org 对资源越来越多的需求,如地下 水、稀缺地球资源和重金属等,显示必须以注重环境的方式开展科学活动,以减轻勘探和开采此类资源所带来 ...
2014. Rare earth elements: Overview of mining, mineralogy, uses, sustainability and envi- ronmental impact. Resources 3:614-635.Haque N, Hughes A, Lim S, Vernon C. Rare Earth Elements: Overview of Mining, Mineralogy, Uses, Sustainability and Environmental Impact. Resources 2014;3(4): 614-...
However, rare earth elements are only found in commercially viable amounts in several areas of the world. This situation has been compounded by Chinese production that has undercut costs of production in the US, by way of lower labor costs and less stringent environmental regulation. Once self-...
Rare-earth element - Minerals, Ores, Uses: The content of the individual rare-earth elements varies considerably from mineral to mineral and from deposit to deposit. The minerals and ores are generally classified as “light” or “heavy”; in the former
『欧路词典』为您提供Rare earth elements的用法讲解,告诉您准确全面的Rare earth elements的中文意思,Rare earth elements的读音,Rare earth elements的同义词,Rare earth elements的反义词,Rare earth elements的例句。
The bioavailability of lightrare earth elementsfrom maize root is evaluated by single regression analysis. 用一元回归分析法评价了使用不同萃取剂时轻稀土元素的生物可利用性. 互联网 The mechanism of purerare earth elementsimproving electrical conductivity of industrial aluminum was also discussed. ...
enormous amounts of rare earth elements, resulting in an impending increase of the commodity [...] daccess-ods.un.org 首先,新兴技术,尤其是混合燃料汽车、风力涡轮机 和电池系统等“绿色技术”需要大量 稀土 元素, 导致 诸如 镝、钕和铕等商品的价 格看涨。 daccess-ods.un.org [...] sulp...
31 Useful Rhetorical Devices More Commonly Misspelled Words Absent Letters That Are Heard Anyway How to Use Accents and Diacritical Marks Popular in Wordplay See All 8 Words for Lesser-Known Musical Instruments It's a Scorcher! Words for the Summer Heat ...
Medical Definition rare earth element noun : any of a series of metallic elements of which the oxides are classed as rare earths and which include the elements of the lanthanide series and sometimes yttrium and scandium called also rare earth metal ...