查询词典 osmium

Lanthanides belong to the sixth cycle of the periodic table Ⅲ B family, are all solid metal, they are La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, holmium, erbium, thulium, ytterbium, and lutetium were 15 kinds of metals and their periphery are two layers of electronic 5d16s2, while the peripheral third layer f orbital but never zero to 14, so the external electronic structure of 4f0-145d16s2, and therefore these elements in oxidation number are to 3, very close chemical properties, extraction, when it is difficult to separate them they are mostly multi-element mineral mix, more difficult to increase refining, and their atomic number of 57-71, one by one to increase the number of protons the nucleus, and thus extranuclear electron of gravity is also growing, so that atomic radius decreases with increasing atomic number Z, which makes lanthanides contraction, ionic radius is also reduced, which also makes Zr, Hf, Nb and Ta, Mo and W, the atom and ionic radius very close to each other they also determine a similar nature, resulting in difficult separation, also the tribe Ⅷ of the fifth cycle, ruthenium, rhodium, palladium, and the sixth cycle, osmium, iridium, platinum is very similar in nature, thus The six elements, said platinum group elements.

镧系元素属于周期表第六周期中ⅢB族，全部是固体金属，它们是镧、铈、镨、钕、钷、钐、铕、钆、铽、镝、钬、铒、铥、镱和镥共十五种金属元素，它们的外围两层的电子均是5d16s2，而外围第三层的f轨道电子却从零增加到14个，所以外围电子结构为4f0－145d16s2，而使这些元素氧化数均为＋3，化学性质极为接近，提炼时很难分开，它们的矿石又大多是多种元素混在一起的，更增加提纯难度，它们的原子序数为57－71，核内质子数逐个增加，因而对核外电子引力也不断增强，使原子半径随原子序数Z增加而减小，这就使镧系元素收缩、离子半径也缩小，这也使得Zr和Hf，Nb和Ta、Mo和W等原子和离子半径都很接近、也决定了它们彼此性质类似，以致难以分离、也使第Ⅷ族中第五周期的钌、铑、钯和第六周期的锇、铱、铂在性质上极为相似，因而称这六个元素为铂系元素。

It is found that the sample stained with silver methenamine instead of mercaptoacetic acid-osmium can prevent the false phenomena caused by the inappropriate use of mercaptoacetic acid.

摘 要：本文将六亚甲四胺银染色法作为加工毛发的电子染色剂得到较好的电子显微图像，并系统地比较了用巯基乙酸-锇法染色的羊毛样品和用六亚甲四胺银染色的人发样品的超微结构，认为对深加工过的毛发样品用六亚甲四胺银法替代巯基乙酸-锇法染角蛋白，可以防止巯基乙酸使用不当引起的假象。

It has been applied to determine osmium in refined ore and chloride residue,and good results were ?.

目前，流动注射分析已广泛应用于许多元素和物质的测定〔1一4〕。

This dissertation is mainly to study the growth of osmium and the properties of magnetic films with an Os layer.

本论文主要在探讨锇金属的成长及加入磁性多层膜后之特性研究。

To solve this problem, several methods have been introduced for the recovery and reuse of the ligands and osmium tetroxide.

为了解决这一问题，科学家探索了多种回收手性配体和四氧化锇的方法。

A new method has been recommened for the determination of osmium by flow injection analysis.

概述 催化动力学分析方法设备简单，灵敏度高，是测定微量组分的一种有效方法。

The osmium may use in the industry to make the catalyst.

锇在工业中可以用做催化剂。

"Our material is hard enough to scratch diamond, and much harder than osmium diboride," he said.

而且其它超硬材料，包括金刚石和立方结构的氮化硼都是在昂贵的高压条件下制造出来的。

Rhenium is a fairly dense, soft metal, which is next to osmium on the periodic table of chemical elements.

铼是一种高密度、低硬度的金属，它在元素周期表中刚好排在锇元素的后面。

Then we searched through the transition metals to see if we could do better than osmium, to get an expansion of less than 10 percent.

凯恩说：于是我们仔细搜索了所有过渡金属以确认是否有比锇更好的过渡金属，从而使膨胀系数少于10%。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。