查询词典 neptunium

It is show that the concentration of n butyraldehyde, neptunium, uranium and HNO 3, ratio of phases effect the stripping of Np in the cascade, i.e.

串级实验结果表明，镎在 1BP中的比例小于 10 %；第二级加入正丁醛时，正丁醛和镎在各级的分布较合理，能兼顾镎的去污与反萃。

The concentration of neptunium and plutonium is extremely low in environmental samples.

核设施的运行，不可避免有放射性物质弥散到环境中。

The fourth set, the neptunium series, is headed by neptunium-237, which has a half-life of 2 million years.

第四个系是錼系，以錼－237为首，半衰期为200万年。

In the U/Pu separation step, it is better to drive neptunium into plutonium stream in order to minimize contamination of uranium by neptunium.

在后处理流程的众多化学分离中，Np的走向和控制是国际后处理界关注的重点研究课题。

Owing to the fact that uranium is 106~107 higher than that of neptunium ,it is extremely difficult to remove uranium from neptunium without any loss of neptunium ,either from the theoretical calculation or from practical experience .

不论从理论计算上，还是从实际的工作经验上，两种待分离的元素在数量级上相差10~6～10~7，要将其中含量高的元素除去，而微量元素不损失是很困难的。

All the methods used now have a common technical difficulty: The presence of large amount of uranium makes unacceptable interferences to the determination of neptunium. A separation procedure is absolutely necessary to separate neptunium from uranium completely.

国内一直没有一个比较理想的准确、灵敏的方法，解决铀产品中微量镎的测定问题，主要原因是现有的方法存在一个共同的技术难点：常量的铀对微量镎的测定干扰很大，必须要将常量铀与微量镎定量分离。

In order to provide a suitable 237Np reference solution for nuclear fuel reprocessing and environmental science, a radioactivity reference solution of neptunium-237 in 0.5 mol/L HNO3 is investigated. It is prepared by dissolution of a neptunium oxide stock from plant.

为了给乏燃料后处理工艺和环境科学研究提供合适的237Np标准溶液，研制了以0.5mol/L HNO3为介质的镎－237放射性活度标准溶液。

The results are shown as follows:The equilibrium for adsorption of neptunium on silica gel reached rapidly. In high acidities,neptunium is hardly adsorbed on silica gel.

用239Np溶液进行上述实验后，又用239Np与237Np的混合溶液或237Np溶液进行了上述部分实验以比较微克量的237Np和示踪量的239Np在硅胶上的吸附行为。

The adsorption isotherm of neptunium on silica gel correspond to the form of Langmuir isotherm. According to Clausius-Claperon equation,from the slope in InKd vs 1/T plot,adsorption heat could be estimated. From the data of adsorption heat it is concluded that the adsorption of neptunium on silica gel in nitric acid solutions belongs to chemical adsorption and the adsorption process is an endothermic reaction.

三种价态的镎在硅胶上吸附的等温线符合兰格缪尔吸附等温线的形式，是单分子层吸附；根据克劳修斯-克拉柏龙方程，以1nKd对1／T作图，通过直线斜率计算出吸附热，从吸附热的数据可判断三种价态的镎在硅胶上的吸附属于化学吸附，是吸热的过程；对NpOV）、Np和Np（VD在硅胶上的吸附进行了比较，提出了三种价态的锋在硅胶上吸附的机理。

The preparation procedure is as following: purification and assay for purity of neptunium, preparation of neptunium nitrate solution, making solution for ageing, subpacking the solution to ampoules, fire sealing, weighing for earch ampoule, homogeneity test, stability test, and certification.

以工厂的氧化镎作原料，经原料提纯→纯度鉴定→配成硝酸溶液→放置陈化→分装→火封→称重→均匀性检验→稳定性检验，最后进行定值。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。