稀土

The carboxyl of the tripodal ligand is a goodbridging group. The building blocks are linked together by the bridging group andother weak interactions (hydrogen bond and π-π stacking interaction, etc), thusgenerating a one, two or three-dimensional metal complexes.2. Studies on the fluorescence properties of the lanthanide complexes indicated that:(1) The excitations in the ligand-based π-π〓 transitions cause the structuredemission of lanthanide complexes while the ligand luminescence is completelyquenched showing that ligand-to-metal energy transfer occurs.

三脚架配体所带的羧基是一个很好的桥联基团，配合物的结构基元通过这种基团的桥联作用及其它一些弱的作用力(如氢键、π-π堆积作用等)联系起来，构成了一维、二维或三维的超分子空间结构。2、稀土配合物的发光研究发现：(1)用配体的π-π〓跃迁波长进行激发，配合物均显示出稀土离子的特征发射峰，同时，配体的荧光峰没有出现，这说明在三脚架配体与稀土离子间进行了有效的能量传递。

Using doped method low rare earth concentration and chelates matrix luminescence was successful in the chelates systems.

稀土荧光络合物研究中借用无机稀土掺杂的办法也可以实现以络合物为基质的低浓度的稀土发光。

The results showed that the addition of the rare earth alloy powder can refine and disperse oxide particles. Through energy spectrum analysis, it was found that the rare earth congregates to Ti and the interface between metal matrix and diamonds. The active La and Ce in alloy powder can reduce the oxide film on Ti particles, increase the reactivity of Ti, and promote the reaction between Ti and diamond.

通过扫描电镜，能谱分析和X射线物相分析、比较和归纳，发现加入适量的稀土-Ni合金粉，使胎体中的氧化物颗粒细小、弥散；在添加稀土合金粉的胎体中，稀土向Ti富集并向金刚石与金属基体界面偏聚。

And the yield of this process reached more than 98% by the chemical ore-milling of the slags using by hydrochloric acid.

稀土转型渣经过化学选矿，在合适的酸度、反应时间和固液比等条件下，稀土渣品位由18.6%提高到31%左右，稀土收率大于98%。

Some essential trace elements were reported to be involved in the normal bone metabolism. Nowadays rare earth elements are widely used in many fields and more and more rare earth elements enter the environment and food chains They are enriched in bone and difficult to be excreted. Because the similarity between rare earth ions (Ln3+) and Ca2+, they will intervene and regulate bone formation and remodeling.

骨骼的正常代谢涉及多种金属离子，随着稀土的应用，通过环境和经由食物链等渠道进入人体内的稀土量也有所增加，并且在骨组织中相对富集且难排出；由于稀土与钙离子的相似性，它们将干预和调控骨的形成与再造。

Some essential trace elements were reported to be involved in the normal bone metabolism. Nowadays rare earth elements are widely used in many fields and more and more rare earth elements enter the environment and food chains. They are enriched in bone and difficult to be excreted. Because the similarity between rare earth ions Ln(superscript 3+ and Ca(superscript 2+), they will intervene and regulate bone formation and remodeling.

骨骼的正常代谢涉及多种金属离子，随着稀土的应用，通过环境和经由食物链等渠道进入人体内的稀土量也有所增加，并且在骨组织中相对富集且难排出；由于稀土与钙离子的相似性，它们将干预和调控骨的形成与再造。

Through the processes of grinding bastnaesite ore concentrate, mixing the ore powder with NaCO3 in the ratio of 1 to 0.1-0.4, roasting the mixture at 400-800 deg.c for 1-6 hr, elution of the roasted sand with hot water to obtain NaF, drying filtered drag after eluting NaF and mixing the dried drag with ammonium chloride, roasting the mixture at 300-600 deg.c for 1-3 hr, hot water soaking to obtain rare earth chloride solution, extraction with 20% kerosine solution of naphthenic acid, and hydrochloric acid counter extraction to obtain rare earth chloride product.

本发明涉及一种氯化铵法从氟碳铈精矿提取氯化稀土的方法，首先将氟碳铈原精矿磨细，并与NaCO 3 混合，其比例为原矿∶NaCO 3 ＝1∶0.1～0.4，混合均匀后在400℃～800℃焙烧1～6小时，焙砂用热水洗出NaF，洗出NaF的滤渣干燥后与氯化铵混合，于300℃～600℃焙烧1～3小时，再用热水浸取得到氯化稀土溶液，用20％的环烷酸煤油液萃取，再采用盐酸反萃得到氯化稀土产品。

The REE in the reducible and aqueous mineral phases accounts for about 71 percent of total RE in the earthy black weathered mineral and is worthy to be recovered comprehensively.

易还原相和水成相稀土约占黑色土状风化物中稀土总量的71%，是这一稀土资源有综合利用价值的部分。

The results indicate that a small amount of Cerium-rich Mischmetal addition refine microstructure and increase ...

因此，压铸AZ81的常温和150℃抗拉强度和屈服强度随稀土加入量的增加先略有提高，然后持续降低；室温延伸率随稀土加入量增加而连续下降，对150℃温度下的延伸率无明显影响；但富铈混合稀土的加入显著提高合金的蠕变抗力。

Part II. Synthesis, characterization and fluorescent properties of rare earthcomplexes of rutin Rare earth complexes of rutin have been synthesized by the reaction of rare earth chloride with rutin in alcohol solution (pH=7～8). The composition and thermal stability of the complexes were characterized by elemental analysis, molar conductivity, thermal analysis, IR, UV.

第二部分：稀土芦丁配合物的合成与表征及其荧光性质以稀土金属氯化物和芦丁为原料，在乙醇溶液中(pH=7～8)合成了6种稀土配合物，通过元素分析、IR、UV、热重-差热分析、摩尔电导率的测定对配合物进行了表征，确定了配合物的组成，分析了配合物的热稳定性和热分解行为。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。