Ignoring the long - term impact on the soil quality D. Only considering the market price of rare E. arth elements 相关知识点: 试题来源: 解析 B。解析:选项A提取速度快并不一定有利于可持续发展,可能会造成资源浪费和环境破坏等问题。选项B将伴生矿物的浪费减到最小,这有助于提高资源的综合利用率,...
Preferably RE is selected from the elements Y, La, Ce, and Pr. The pigments are used as colorants for coloring paints, inks, plastics, and rubber.ノルベルト ムロンガキリル ブラムニク
aRare earth refers to 17 metal elements which are chemically similar such as europium, yttrium and lanthanum. They are uniquely magnetic and optical and have other characters, which are important to micromation, laser and energy efficiency. Rare earth mineral resources are the important material basi...
根据第四段For instance,the scaled-up experiments achieved a recovery efficiency of 96% within 67 hours by using electrokinetics.Using the conventional technique,it was only 62% at 130 hours.(例如,通过使用电动力学,扩大的实验在67小时内实现了96%的回收效率。使用传统技术,在130小时时...
Active fibers are doped with rare-earth elements (like Erbium, Ytterbium or Thulium) which perform the stimulated emission by transforming the laser diode pumping power to the laser power. The pumping wavelength required for Ytterbium (Yb3+) or Erbium(Er3+) is typically 915 or 976 nm whereas ...
aPlant growth responses to the rare earth elements lanthanum (La) and cerium (Ce) have been reported, but little is known about the effects of these two elements on plant mineral nutrition. 对稀土元素镧La和 (铈) 铈的植物生长 (反应) 报告了,但一点在植物矿物营养被知道关于这二个元素的作用。
To improve the corrosion resistance of the title magnet by a method wherein a texture in a sintered body is constituted of the following: a ferromagnetic main phase; a nonmagnetic B-rich phase; and a nonmagnetic R-rich phase in which the intermetallic compound by rare-earth elements and by ...
“the trembling sod”.The country was full of wide-eyed priests eager to bring the blessings of Christianity unto the heathen of all the world, but there were no roads, there were no bridges, there were no means of communication of any sort.All those little elements that are of such ...
Water and earth signs are what astrologers call "congenial elements," which means that they go together well, even though they have their differences. Another water sign, Pisces, will teach you how to enjoy unpredictability and excitement. You’ll be inspired by their ability to change, and ...
Uranium is among the more common elements in the earth’s crust — about 500 times more common than gold. Although it seems a very rare element, small amounts of uranium are present everywhere — in rock, soil, water, and even our bodies. There are also large amounts of highly diluted...