查询词典 rare earth

The yield of product was 56.1% when rare-earth composite solid superacid SO(superscript 2- subscript 4)/ZrO2-CeO2 was used as catalyst at dosage of 3 % of the mass of β-pinene, while mass ratio of borneol to isoborneol in the product reached 46.0:23.2, showing higher borneol selectivity than other catalysts.

当用稀土复合固体超强酸SO(上标 2-下标 4)/ZrO2-CeO2为催化剂，用量3%时，粗龙脑产率为56.1%，但对正龙脑的选择性高于其他催化剂，正、异龙脑比为

The synthesis of butyl isobutyrate with n-butanol and isobutyric acid as reactants and rare-earth solid superacid SO_4~(2-)/TiO_2/La~(3+) as catalyst has been studied.

研究了以稀土固体超强酸 SO_4~（2－）／TiO_2／La~（3＋）为催化剂，异丁酸和正丁醇为原料合成异丁酸丁酯，并考察了影响反应的因素。

For both series of heteroleptic tris rare earth compounds, the characteristic phthalocyanine dianion IR bands for Pc2- and O OPc2- at ca. 1329 and 1380 cm-1 attributed to the pyrrole stretching and the symmetric C-H bending of -CH3 groups in octyloxy side chains of OOPc rings together with some small contribution from the isoindole stretching vibrations,re specteively,are simultaneously found in their IR spectra.

在这两个不对称三明治型稀土配合物系列的红外光谱中发现了这样一种特性，即酞菁阴离子Pc~(2-)和OOPc~(2-)的特征波段在1329cm~(-1)和1380cm~(-1)之间，这是因为吡咯的伸缩振动和OOPc环中八烷氧基侧链上-CH_3基团的对称C-H的弯曲振动共同作用于吲哚环的伸缩振动。

Under these conditions, the yield of cyclohexanone glycol ketal could be reach 90.4%, indicating that rare earth composite solid superacid SO4(superscript 2-)/ZrO2(superscript 3+) is a good catalyst for the synthesis of cyclohexanone glycol ketal.

在此条件下，缩酮收率可达90.4%，说明稀土复合固体超强酸SO4(上标 2-)/ZrO2/Gd(上标 3+)是一种合成环己酮乙二醇缩酮的优良催化剂。

Guided by theory and method of unit-superunit mapping in the granite area, study the lithology, lithochemistry, trace elements, and rare earth elements, er. of the Wuzengsu gabbro body, and subdivide the body into four units.

摘要借鉴花岗岩区单元－超单元填图理论方法，通过对乌增苏辉长岩体岩石学、岩石化学、微量元素、稀土元素等特征的研究，将岩体划分为四个单元。

The fourteen complexes of mandelic acid with rare earth elements in aqueous solution have been prepared.

在水溶液体系中，用苯羟乙酸直接与碳酸稀土作用，合成了十四种苯羟乙酸稀土配合物。

The mineralogy, petrology, rare earth and trace element geochemistry, Re-Os and Sr-Nd isotopic geochemistry of the black shales and cherts of Yuretusi Formation at the bottom of the Cambrian in Xiaoerbulake and Shugeitebulake sections from northern Tarim Basin have been systematically studied. It was discovered that the high enrichment of some deep source metal elements in the black shales deals with the activity of hydrothermal fluid from the lower crust or upper mantal.

本项目对塔里木盆地北部肖尔布拉克和苏盖特布拉克两剖面下寒武统底部玉尔吐斯组富有机质黑色页岩和硅质岩的矿物学、岩石学、微量元素、稀土元素、Re-Os和Sr-Nd同位素地球化学进行了系统研究，发现该黑色页岩中部分深源金属元素的高度富集与来自盆地下部上地幔或下地壳的深部物源的热水流体作用有关。

In this paper, the conductive Barium metaplumbate (BaPbO3) doped with various contents of rare earth was prepared by powder metallurgy method using mechanical milling and liquid-state co-precipitation method.

本研究分别采用机械合金化法和化学液相共沉淀法，以粉末冶金为路线的方法，制备了添加不同稀土含量的BaPbO_3导电陶瓷材料。

Maoming City is rich in mineral resources with nearly hundreds of minerals and 27 proved reserves. Of them, oil shale and kaolin boast the most reserves in the country; quality and reserves of rare earth and orthophyre tin ore also play an important role in the country; jade mine, which called "the jade in the South", is one of the three biggest jade mines in our country.

茂名市矿藏丰富，各种矿物近百种，已探明储量的有27种，油母叶岩、高岭土储量名列全国之冠；稀土、斑岩型锡矿的质量和储量也在全国占有一席之地；有&南方碧玉&之称的玉石矿是我国三大玉矿之一。

Another interesting host of rare earth ions is single crystal yttrium orthovanadate, YVO〓.

另一种极具特色的稀土离子基质材料是YVO〓晶体。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。