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rare earth elements 释义 稀土元素 实用场景例句 全部 The Catalytic mechanism ofrare earth elementsis also discussed. 讨论了稀土元素的催渗机理. 互联网 Some typical cast ferroalloys and nonferroalloys containingrare earth elementswere described.
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 ...
Rare earth elements in everyday useThe article identifies the various rare earth minerals that are used in the production of high-technology products, including europium, terbium, and yttrium.Human Events
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
earth usage is based on the unique properties of the individual elements. Furthermore, a close examination of these elements reveals vast differences in their behaviours and properties; e.g., themelting pointof lanthanum, theprototypeelement of thelanthanideseries (918 °C, or 1,684 °F), is...
Are These Elements Really "Rare"? History of Production and Trade Dangers of a Dominant World Producer World Rare Earth Mineral Resources Rare Earth Element OutlookWhat Are Rare Earth Elements (REEs)? Rare earth elements are a group of seventeen chemical elements that occur together in the periodi...
1. It suggests that rare-earth elements yttrium and praseodymium have certain genotoxicity. 提示稀土元素钇和镨具有一定的遗传毒性。 来自互联网 2. The nearside also has much more kreep-potassium, rare-earth elements, and phosphorus-according to scientists. 据科学家称,月球近地端含有更多的克里普矿物...
Mining rare-earth (稀土) elements (REEs) has long been considered a dirty business, as it can lead to water and soil pollution, but a new technology developed by Chinese scientists may change the trend, offering a greener alternative for the industry. REEs, especially heavy ones, are an ess...
The meaning of RARE EARTH ELEMENT is 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.