三价

For instance, praseodymium forms the core of carbon arc lights that are used by the motion picture industry for studio lighting.

性状：黑色粉末，密度6.88 g/cm3，熔点2042℃，不溶于水，能溶于酸生成三价盐类。导电性良好。

The effects, such as the acidity of leaching system, the temperature and the concentration of the sodium chloride, on oxidation and leaching of copper-bearing gold ores were analyzed. The results show that the sequence of sulfide ores oxidized and dissolved are pyrrhotite firstly, sulphide secondly, then chalcopyrite, pyrite lastly.

结果表明：硫化矿的氧化溶解首先是磁黄铁矿，其次是铜的次生硫化矿，再次是黄铜矿，最后是黄铁矿；载金黄铜矿的氧化首先是铁从黄铜矿的晶格中氧化溶解出来，生成中间产物CuS2和CuS；较高的酸度和氯化钠浓度有利于单质硫的生成、三价铁的水解和铜的浸出，进而有利于金浸出率的提高。

The assorted minerals of zirconolite and sphene doping simulated actinide neodymiumwere fabricated by solid reaction, using zircon, titanium dioxide, calcium carbonate, Al2O3 as raw materials.

以ZrSiO4、CaCO3、TiO2、Al2O3、Nd2O3为原料，引入Al3+作价态补偿，通过固相反应制备包容模拟三价锕系核素Nd的钙钛锆石(CaZrTi2O7)和榍石(CaTiSiO5)组合矿物固化体。

The position of the short SC,which is on the long SC homologous synapsis of rob(13;17and 13,17moved ,from one-fourth of long SC to one-tenth of it ,near the end of 17arm.

II。三价体中短SC侧臂在长SC臂rob(13；17)与13、17上的位置发生移动，由原来的位于长SC的1/4处移动到了1/10处，即靠近17臂端。

Studies on syneresis behavior of Xantlian/Crhydrogels have been conducted at 70,80 and 90℃.

对黄原胶／三价铬水凝胶在70，80和90℃下的脱水行为进行了研究。

The onset of syneresis appeared at a critical Crdensity in a gel and the syneresis became serious when the Cr density increased.

脱水与凝胶的交联密度即参与交联反应的三价铬的含量有密切联系。

The process of syneresis can be described by means of apperant first-order reaction and the rate constant increased with increasing the temperature and the initial Crconcentration. The apparent activation energy was about 34.5 kcal/mol.

突发脱水之后的过程可以用一级反应动力学描述，反应速度常数随三价铬的浓度和温度的增高而增大，活化能为34.5kcal／mol。

There are blue and green emission spectral series in the phosphors activated by three valence ions of Terbium.

三价铽离子激活的磷光体有兰色和绿色两个发射谱线系列。本文分析了这两个系列谱线的强度，随着激活剂浓度而变化的实验结果，发现在激活剂浓度达到一定数量之后，当继续增加激活剂含量时，兰色和绿色发射谱线相对强度的变化规律，和加入敏化剂的结果是一致的。

In this paper, the experiment results in the strength of two spectral series depending on the concentration of sensibilizer Terbium have been analysed.

可见对于铽的绿色谱线而言，铽离子本身也会起一种敏化作用。据此，我们提出了三价铽离子具有自敏化效应的观点，来解释上述的实验结果，这种观点是：在含有较高浓度铽离子的磷光体中，铽离子既是绿色辐射的发光中心，又是它的敏化中心。

A white trivalent metallic element; sometimes classified in the rare earth group; occurs in the Scandinavian mineral thortveitite.

一种白色三价金属元素，有时归为稀土属，见于斯堪的纳维亚钪钇石中。

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。