铀

Authors suggest that uranium ore formation occurred after the appearance of the above subsidiary tectonic units, and sandstone bodies of the Ⅱ,Ⅲ,Ⅳ,Ⅶ cycles, Shuixigou Group in the southern syncline, and sandstone bodies of the Ⅰ,Ⅱ,Ⅲ,Ⅴ cycles, Shuixigou Group, as well as sandstone bodies of Xiaoquangou Group in the northern monoclinal zone, they are ...

文章认为铀成矿作用发生在这些次级构造单元形成之后，且具有找矿前景的是南部向斜带水西沟群第Ⅱ、Ⅲ、Ⅴ、Ⅶ旋回砂体和北部单斜带水西沟群第Ⅰ、Ⅱ、Ⅲ、Ⅴ旋回砂体及小泉沟群砂体。从容矿层位连续性、分布面积、砂体特征及层间氧化带发育特征等成矿条件看，北部单斜带铀成矿条件和找矿前景均优于南部向斜带。

Only two, neptunium (93) and plutonium (94), occur in nature, and only as traces in uranium ore s as a result of neutron irradiation.

自然界里只有錼(93)和钸(94)两种超铀元素，而且只以痕量存在于铀的矿物中，是受中子辐照后的产物。

Only two, neptunium (93) and plutonium (94), occur in nature, and only as trace s in uranium ores as a result of neutron irradiation.

自然界里只有錼(93)和钸(94)两种超铀元素，而且只以痕量存在于铀的矿物中，是受中子辐照后的产物。

Only two, neptunium (93) and plutonium (94), occur in nature, and only as traces in uranium ores as a result of neutron irradiation.

自然界里只有錼(93)和钸(94)两种超铀元素，而且只以痕量存在于铀的矿物中，是受中子辐照后的产物。

The thesis focuses on the study of the reactions of hydroxyurea, a novel salt free agent, with uranium, neptunium and plutonium in order to investigate the possibilities of its application in the Purex process(1B) for uranium and plutonium separation.

本论文重点研究了一种新型无盐试剂—羟基脲与铀、镎、钚相互作用的化学，旨在研究这种新型无盐试剂在Purex流程铀、钚分离段(1B)中应用的可能性。

Conventional radiochemical methods such as alpha spectrometry, neutron activation analysis, liquid scintillation system, fission track and gamma spectrometry for the quantitative determination of neptunium and plutonium often require complicated and time-consuming sample preparation and separation procedures.

研究环境中铀、镎、钚等长寿命放射性核素的精密测定，对保护公众安全和保护环境，对了解核设施的历史操作情况和现状，都具有重要意义。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。

Uranium is usually extracted from ore that contains 1,000 or more parts per million of the element.

铀通常是从铀含量在百万分之一千以上（1000 ppm）的铀矿中提炼出来。

The uranium may be put into the reactor in the shape of rods, and the rods surrounded with a neutron-slower, or moderator

可以把铀做成棒状放在原子反应堆内，在铀棒的四周，围一层中子减速剂即节速剂。

It is concluded that effects of coal on uranium include sorption, complexation and revivification in syngenesis and early diagenesis and coal measures have positive effect on redistribution and preservation of uranium deposit in the epidiagenetic stage.

研究认为，在同生成岩阶段和早成岩阶段，煤对铀的作用主要包括吸附作用、络合作用及还原作用；表生成岩阶段，煤对铀的再分配和"保矿"起到积极作用。

ABSTRACT A large passive-active neutron shuffler for the assay of drum containing uranium and transuranic waste is a nondestructive assay instrument which can work in passive and active mode.

大型桶装铀及超铀废物分类装置是一种非破坏性分析仪器，可工作于无源和有源两种方式。

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。