铀的

The concentration of neptunium and plutonium is extremely low in environmental samples. Additionally such samples have a complex matrix composition, which is to be taken into account for a proper analysis.

环境样品基体复杂，铀、镎和钚等锕系元素含量非常低，在复杂的生态条件下，这些核素常常具有复杂多变的化学形态，要准确测定其含量，必须要有灵敏可靠的检测方法。

Since 1980s, ICP-MS has been used overseas for the determination of uranium, thorium, neptunium, and plutonium in environmental samples. ICP-MS is one of the most suitable analysis techniques for the measurement of the long-lived radionuclides.

自八十年代以来，国外对ICP-MS测量环境样品中的铀、钍、镎和钚的研究表明，ICP-MS在测量长寿命放射性核素方面是最有发展前景的测量技术之一。

She assumptions Road: Emilio segre should have found the first transuranic element neptunium, if he is not a lack of adequate knowledge of chemical and rare earth elements to make mistakes to 23,993 words; Similarly, Enrico Fermi should have been found in fission, if his team The chemical separation technology is not quite so appropriate.

她假设道：Emilio segre本应当发现第一个超铀元素镎，如果他不是缺少足够的化学知识而把23993错认作稀土元素的话；与此相似，Enrico Fermi本应该发现裂变，如果他的研究小组的化学分离技术不是这样不甚适当的话。

Within the range of 1 X 10-8~9.72 10-10 g/ml, the concentration of Np and intensity to the fluorescence of Tiron-Tb present relations of linearity, the detection limit for Np is 0.127ng/ml, nearly 1000 times high of uranium does not interfere the determination of the neptunium.

在1×10~(-8)～9.72×10~(-10)g／ml范围内，Np的浓度与Tiron-Tb的相对荧光强度呈线性关系，方法检出限：1.27×10~(-10)g／ml，将近1000倍的铀存在时不产生干扰。

One of the methods to set free the energy locked in such substances as uranium is known as nuclear fission.

一种把储存在象铀这样的物质里面的能量释放出来的方法被称为核裂变。

In this parer, the features of hot extruding and upsetting on the unsymmytrical shaft parts have been analyzed.

本文分析了非对称轴类零件的热挤镦成形特点，设计了一套适合挤镦成形非对称轴类件的模具装置该装置已用于转向摇臂铀和制动蹄的精锻生产。

In order to determine the content of hydrocarbons and halohydrocarbons in uranium hexafluoride,the first step is to passivate the inlet system and ion source of mass-spectrometer.

了测定六氟化铀中烃和卤代烃的含量，首先要对进样系统和质谱计的离子源进行充分的钝化。样品必须全部汽化后方可通入质谱计，否则分馏效应将严重歪曲测量结果。

Using a very simple system consisting of uranyl solution and solid thioaeefamide, we have got pitchblende successfully.

实验是在只有六价铀与硫代乙酰胺存在的非常简单的体系中进行的。

Marie:When the uranium and thorium are in the pitchblende,the reading is eight, but individually they only total four. Why,then, do they give out twice as much when they're in the pitchblende as they do when they're tested separately?

玛丽：当铀和钍包含在铀矿里的时候，读数是八，而分别测量后加起来只有四，那麼为什麼存在於铀矿中所产生的能量竟是单独产生能量之和的两倍？

Marie:When the uranium and thorium are in the pitchblende,the reading iseight, but individually they only total four. Why,then, do they give out twiceseparately?

玛丽：当铀和钍包含在铀矿里的时候，读数是八，而分别测量后加起来只有四，那么为什么存在于铀矿中所产生的能量竟是单独产生能量之和的两倍？

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。