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A new tetrakis( p glycylglycinephenyl)porphin and its rare earth (Yb,Sm) complexes were synthesized.They have been characterized by elemental analysis,UV vis,IR, 1HNMR and laser Raman spectra.

首次合成了一种新型的四(对甘氨酰甘氨酸)苯基卟吩及其稀土镱、钐的配合物。元素分析、红外光谱、紫外可见光谱、核磁激光拉曼光谱等方法进行了表征。

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This review summaries the application of ion exchangers in the separation and determination of alkali metals, alkali-earth metals, noble metals, rare earth elements and actinoid.

离子交换剂在萃取色谱得到了广泛的应,本文详细总结了离子交换剂在分析化于碱金属、碱土金属、贵金属、稀土元素锕系元素等的分离与测定。

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The results show that rare earth elements can efficiently improve the structures of the Chromvanadizing layer, the rate of growth and properties of diffusion layer.

结果表明,稀土元素能有效地改善铬钒渗层结构,提高渗层生长速度性能。

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Rare earth metals, such as metallic neodymium and metallic didymium (metallic praseodymium-neodymium), are used for rare earth magnets, mainly neodymium-iron-boron magnet.

稀土金属,如金属钕金属皮(金属镨,钕) ,于稀土磁铁,主要钕铁硼磁铁。

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It will lay a good foundation for studying the mechanism of the interaction of anti-oxidases with rare earth ions.

这可为研究稀土离子与植物体保护酶作机理打下坚实的基础。

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Rare earth can influence for shape size,distribution and quantity of niobium carbonide,decrease activity of carbon and niobium i...

稀土对碳化铌形态、大小、分布、数量有影响,可降低碳、铌活度,阻碍碳化铌在奥氏体区的析出。

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VOA Special 2017年11月合集

The researchers also found large amounts of rare earth minerals.

还发现了大量的矿物。

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宇宙奥秘

Regolith or lunar soil gold platinum and many other rare earth elements such as atrium used in the manufacture of computer screens are all stored in the inner layers of Earth's satellite.

用于制造脑屏幕的风化层或月球壤、金、铂和许多其他元素,如中庭,都储存在地球卫星的内层。

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PBS地球-俯瞰世界

In order to extract rare earth elements from the Berkeley pit, researchers are testing new chemical techniques that could bind specifically to rare earth elements.

为从伯克利矿坑水体中提取元素,研正在试验新型化学萃取技术,精准吸附分离稀物质。

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CNN 10 学生英语 2025年3月合集

So what are rare earth and critical minerals?

那么和关键矿物资源具体是指什么呢?

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CCTV 见闻

As promise China will keep following fair and free trade principles and exporting rare earths.

正如承诺的那样,中国将继续遵循公平和自由贸易原则,出口

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纽约时报 (New York Times)

" I want security of the rare earth, " he said.

“我要安全。”他说。

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VOA Special 2022年9月合集

Meanwhile, supplies of rare earths have decreased.

与此同时,供应也在减少。

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CRI在线 2015年11月合集

The expedition made significant achievements in surveys of rare earth, cobalt-rich crusts and polymetallic nodules.

“海洋六号”此次考察任务在深海稀资源调查、富钴结壳资源和多金属结核资源调查等方面取得了丰硕成果。

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CNN 10 学生英语 2024年3月合集

What's more, e-waste recycling only produces 1% of the rare earth elements needed to meet the current demand, which leaves the world highly dependent on just a few countries where rare earths are mined, including countries in Africa.

更重要的是, 圾回收只能生产满足当前需求所需元素的1%,这使得世界高度依赖少数开采稀的国家,其中包括非洲国家。

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连线杂志

The light travels to the laser cavity, a portion of the fiber optic cable that's doped with rare earth elements where broad spectrum light is transformed into that of a single wavelength.

光传播到激光腔,光纤缆的一部分掺杂了元素,在那里广谱光被转化为单一波长的光。

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VOA Daily Standard 2025年3月合集

Keith Kellogg, the president's special envoy to Ukraine and Russia, tells the Council on Foreign Relations Ukrainian leader Volodymyr Zelenskyy was told last week's Oval Office talks would focus on signing a rare earth minerals deal with the U.S.

特朗普总统的乌克兰和俄罗斯问题特使基思·凯洛格告诉外交关系委会,乌克兰领导泽连斯基上周被告知,椭圆形办公室的会谈将集中在与美国签署矿产协议上。

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VOA Daily Standard 2025年2月合集

Ukrainian President Volodymyr Zelenskyy has told the Associated Press he directed his ministers not to sign a proposed agreement to give the U.S. access to Ukraine's rare earth minerals. AP correspondent Donna Warder reports.

乌克兰总统泽连斯基告诉美联社,他指示他的部长们不要签署一项允许美国获取乌克兰的拟议协议。美联社记者唐娜·沃德(Donna Warder)报道。

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China Daily 播客集

Simultaneously, the Ministry of Commerce and the General Administration of Customs announced immediate export restrictions on seven key medium to heavy rare earth elements, as China Daily first reported on Thursday.

据《中国日报》周四率先报道,商务部和海关总署同时宣布立即对七种关键的中重元素实施出口限制。

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CNN 10 学生英语 2024年2月合集

The moon is home to many resources like rare earth minerals and elements like the isotope helium three that could prove useful to mine.

月球拥有许多资源,如矿物和氦三同位素等元素,这些资源可能对开矿很有用。

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VOA Special 2024年7月合集

Speaking about Brazil's possible rare earth supplies, Morgan said, " There have been some very meaningful discoveries made in the past couple of years."

摩根在谈到巴西可能的供应时说:“过去几年有一些非常有意义的发现。”

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VOA慢速英语_科技

Other automakers said they are in the process of researching or developing EV motors that use little or no rare earth minerals.

其他汽车制造商表示,他们正在研或开发使用很少或不使用矿物的动汽车发动机。

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CRI在线 2021年3月合集

The order will focus on four critical products such as semiconductor chips, large-capacity batteries for electric vehicles, rare earth minerals and pharmaceuticals.

该命令将重点关注半导体芯片、动汽车用大容量池、矿物和药品等四种关键产品。

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VOA Special 2021年10月合集

Another machine in the factory makes a part that is being used instead of rare earth magnets in the electric cars.

工厂的另一台机器制造了一种部件,取代了现在动汽车上使用的磁铁。

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CRI在线 2025年2月合集

U.S. President Donald Trump says an agreement to secure the country's access to rare earth minerals in Ukraine is close.

美国总统唐纳德·特朗普表示,一项确保美国获得乌克兰矿产的协议即将达成。

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CRI在线 2020年7月合集

The items eligible for tariff waivers include rare earth ore.

符合减免关税条件的商品包括

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