铈的

Preparation of ceria with large particle size and high appearance density.

大粒度，高表观比重氧化铈的合成。

We find that the microwave absorption properties of both kinds of ferrite change as different amount of rare earth cerium doped.

然后对两个体系分别掺杂不同微量的稀土元素铈，发现两个体系的微波吸收特性随掺杂铈的量的不同而改变。

Based on aquicultural experiment, the authors studied the response of enzymatic protective system of Raphanus sativus L to acid rain stress and the conservation of La and Ce. Relative evaluation of La and Ce was assessed simultaneously.

溶液培养条件下，研究了酸雨胁迫条件下萝卜（Raphanus sativus L。，一点红）保护酶系统的响应及稀土元素镧、铈的防护作用，并就镧、铈的防护作用进行了比较。

School of Environmental Science and Engineering, Shandong University, Shandong Jinan, 250062Abstract: The preparation methods of nanometer ceric oxide at home and abroad were reviewed, their advantages and disadvantages were discussed, and its application fields were introduced too.

山东大学环境科学与工程学院，山东济南，250062摘要：综述了国内外纳米二氧化铈的制备方法，比较了各方法的优缺点，并介绍了纳米二氧化铈的应用领域。

The results showed that monocarboxylic acid stearic acid played a role of surfactant, and the product was still orthorhombic Ce2O(CO3)2·H2O with a high crystallization degree. In turn, duality-carboxylic acid tartaric acid...

实验结果表明在尿素及硝酸铈的混合溶液中分别加入一元羧酸硬脂酸，二元羧酸酒石酸和三元羧酸柠檬酸时，一元羧酸硬脂酸在混合溶液中只起表面活性剂的作用，其产物为斜方晶系的单晶Ce2O(CO3)2.H2O微粉，且表面活性剂硬脂酸的加入使得晶体的晶化程度明显提高；而二元羧酸酒石酸与三元羧酸柠檬酸在均相反应中则起螯合剂的作用，分别与Ce3+形成螯合物酒石酸铈和柠檬酸铈，这些结果的造成是由于其反应机理的不同所导致的。

The optimum condition of preparing process were obtained: the amount - of - substance ratio of sodium hydroxide and eerie sulfate tetrahydrate was 4.8:1 ,the quantity of PEG was 8 mL in reaction and 7 mL in washing, absolute alcohol was 10 mL in washing, irradiation time was 6 min, constant microwave irradiation pressure was 0.14 MPa, microwave power was 232 W, the ultrasonic wave dispersing time was 10 min and the microwave drying time was 10 min.

通过考察制备过程中的各个影响因素，得到了制备纳米二氧化铈的最佳工艺条件：氢氧化钠与四水硫酸高铈物质的量比为4.8：1；聚乙二醇的反应用量为8mL，洗涤用量为7mL；无水乙醇的洗涤用量为10mL；微波恒压时间为6min；微波压力为0.14MPa；微波功率为232W；超声波分散时间为10min；微波干燥时间为10min。

Effects of roast temperature, roast time, the amounts of sodium carbonate on decomposition of bastnaesite concentrate and effects of leaching temperature, leaching time, concentration of hydrochloric acid, the amounts of hydrochloric acid on leaching ratio of trivalent rare earth and tetravalent cerium was studied systematically.

系统地研究了焙烧温度、焙烧时间和碳酸钠的加入量对氟碳铈矿精矿焙烧分解的影响及浸出时间、浸出温度、盐酸浓度和盐酸用量对三价稀土和铈的浸出率的影响。

The dopping of Ce would not lead to new PL peaks, but an appropriate Ce dopping could increase the PL intensity.

铈的掺杂没有引发新的荧光现象，适量铈的掺杂能够增强催化剂样品的荧光强度。

The influence of doped cerium amount and heat-treat ment temperature on the photocatalytic degradation efficiency of TiO2 film for oleic acid was investigated by high pressure liquid chromatography, ultraviolet -visible spectrophotometer and scanning electron microscope.

利用高压液相色谱、紫外-可见光分光光度计、扫描电镜和能谱仪手段对掺杂铈的TiO2薄膜进行了表征，考察了掺杂铈对油酸光催化降解效率及TiO2薄膜表面晶粒分布的影响，并对薄膜的化学成分进行了定性和定量分析。

Results indicate that its conductibility will be improved and its density will decrease if Ce is added into the leadfree solder.In the range of 0.03wt.% to 0.05wt.% of Ce,the wettability of the solder is improved,especially when the content of Ce is about 0.03wt.%,the grains of the micro structure in lead-free solder are smaller and more homogeneo...

结果表明，添加微量的铈后，钎料的导电性能提高，密度下降；铈含量在0.03%和0.05%时可以改善钎料的润湿性；特别是0.03%质量分数时晶粒组织最为细小均匀，焊点抗拉强度也最高；当铈含量大于0.1%时对钎料的性能产生不利影响，润湿时间升高，焊点抗拉强度大幅降低，因此稀土元素铈的最佳含量应为0.03%。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新