查询词典 rare earth

Rare earth organometallic chemistry is closely interrelated with materials science, organic synthesis, life science. Rare earth organometallic complexes containing Ln-C σ bond and involving silylene-bridged fluorenyl are of important significance in macromolecular and asymmetry organic synthesis.

稀土金属有机化学与材料科学、有机合成、生命科学等学科密切相关，含Ln-Co键稀土金属有机配合物和含硅桥配体稀土金属有机配合物在高分子和有机合成不对称催化领域具有重要意义。

The experimental results showed that SiC ultrafine powder was synthesized at 1500℃for 120 minutes by used rare earth lanthanum as additive. Its primary particle size was about 100nm and aggregated particle size was about 360nm and the particle shape was regulation, non-aggregation and well dispersibility. While the rare earth ceria used as the additive, SiC ultrafine powder was synthesized at 1500℃for 150 minutes but the particle shape was irregulation and seriously agglomerated and had numerous crystal whiskers.

实验结果表明：以稀土镧为添加剂时，在1500℃×120min合成工艺下，可以合成出一次粒径为100nm左右，二次粒径为360nm的SiC细粉，且SiC粉体颗粒形状规则，无团聚，分散性好；以稀土铈为添加剂时，在1500℃×150min合成工艺下，也可以得到单相的SiC，但SiC粉体颗粒形状不规则，有大量晶须存在，且团聚严重。

The activated hydroxyl of the rare earth complex reacted with the -NCO of the of isophorone diisocyanate,and a new bonding-type rare earth polymer materials was prepared. We studied the optical property, thermodynamic properties of the materials were, and the results obtained show that the materials have high light transmittance and thermal stability as well as good fluorescence properties.

同时利用配合物的活性基团羟基与异佛尔酮－二异氰酸酯中的异氰酸根活性基团进行反应，制备出一种新型的键合型稀土高分子材料，并考察了该材料的光学性能、热力学性能等。

The development of magnetic materials was extremely rapid during the 1990's,when magnetic alloys of the rare earth-3d iron group,such as rare earth permanent magnets,giant magnetostriction materials,giant magnetocaloric materials,magnetooptic materials,magnetic amorphous materials,and nanocrystalline magnetic materials,appeared one by one.

稀土-3d过渡族磁性合金材料，如稀土永磁、巨磁致收缩材料、巨磁热效应材料，磁光效应材料等，以及非晶，纳米微晶磁性材料相继问世。1988年巨磁电阻效应的发现已获广泛应用，如读出磁头、传感器以及磁随机存储器等，并发展成为自旋电子学的新学科。

The oxyhalide rare earth doped laser glass of the present invention comprises the substitution of fluorine for oxygen in glasses having the general molar batch composition of 50% SiO2, 25% CaO, 25% Al2O3 to improve the distribution of rare earth dopants in the glass.

本发明稀土元素掺杂的卤氧化物激光玻璃是用氟代替一般摩尔配料组成为50％、SiO 2 、25％CaO、25％Al 2 O 3 的玻璃中的氧，以改进玻璃中稀土掺杂剂的分布。

An oxidative halogenation process involving contacting a reactant hydrocarbon selected from methane, a halogenated C1 hydrocarbon, or a mixture thereof with a source of halogen and, preferably, a source of oxygen in the presence of a rare earth halide or rare earth oxyhalide catalyst, so as to form a halogenated C1 hydrocarbon having a greater number of halogen substituents as compared with the reactant hydrocarbon.

一种氧化卤化方法，包括使一种选自甲烷、卤代C1烃、或其混合物的反应剂烃与卤素源和优选的氧源，在稀土卤化物或稀土卤氧化物催化剂存在下，进行接触，从而形成一种卤代C1烃产物，它较所述反应剂烃具有更多数目的卤素取代基。

Separation of complexes of different pheophytins with the same rare earth ion was firstly accomplished by reversed-phase HPLC, but the attempt of separation of complexes of pheophytin with different rare earth ions was unsuccessful.

首次实现了对同一稀土不同叶绿素配体所形成的配合物之间的色谱分离，然而不同稀土同一叶绿素配体所形成的配合物之间的分离尝试未获得成功。

To improve the photoemissive sensitivity of nanoparticle composite photoemissive thin film and to fill the blank of rare earth application research in the field of photoemissive material, the rare earth elements are introduced into nanoparticle composite photoemissive thin film in the first time.

本文以纳米粒子复合光电发射薄膜需要进一步提高光电灵敏度为出发点，以稀土元素独特的性质及其应用研究在光电发射材料方面的空白点为切入点，首次将稀土元素引入到纳米粒子复合光电发射薄膜中，对现有的纳米粒子复合光电薄膜的光电发射性能进行改善和提高。

Through the addition of rare earth oxidation La_2O_3 and CeO_2 into the electrode coating , the effect of rare earth oxidation on high temperature oxidation and sulphidation resistance is studied and the rational addition amount is suggested.

通过A402，A302，A202及Cr24Ni7不锈钢焊条熔敷金属的抗高温氧化腐蚀性能对比试验分析，设计了新的专用焊条合金系统Cr26Nil6，并在焊条药皮中分别添加微量稀土氧化物La2O3及CeO2，研究不同稀土氧化物添加量对焊条熔敷金属在空气中和含硫气氛中抗高温氧化及腐蚀性能的影响，从而确定了合理的稀土氧化物加入量。

Rare earth complexes can coordinated to the surface of sulphonated polystyrene microspheres when the content of EuCl〓 was not saturated. Rare earth complexes may aggregate when the content of EuCl〓 exceed to saturation.

当EuCl〓的含量未达到配合的饱和程度时，稀土配合物均匀地配合在PS微球表面，而当稀土配合物的含量超过微球表面的配位能力之后，稀土配合物就会发生团聚。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了