铀

Element; discovered by bombarding americium with helium.

一种放射性超铀元素，在用氦轰击镅时发现。

A radioactive transuranic element; discovered by bombarding americium with helium.

一种放射性超铀元素，在用氦轰击镅时发现。注意，注意力集中

The extraction of americium,plutonium and uranium by dicyclohexano 18 crown 6(DCH18C6)/1 octanol from HNO 3 solution and simulated HLLW are studied.

研究了二环己基18 冠6（DCH18C6）－正辛醇从硝酸溶液和模拟高放废液中镅、钚、铀的萃取。

At low HNO3 concentration and dilution factor above 2, 0.1 mol/L DCH18C6/1-octanol extracts very little americium,plutonium and uranium.The distribution ratios of Am、Pu and U increase with the increase of HNO3 concentration in aqueous phase,and decrease with increasing of dilution factor of HLLW.The distribution ratio of extraction of Pu increases with the increase of extractant concentration.

研究结果表明，在低硝酸浓度和较大稀释倍数情况下，DCH18C6对镅、钚、铀的萃取分配比都比较小，并随着水相硝酸浓度的增大而增大，随着模拟高放废液稀释倍数的增大而减小，提高萃取剂浓度会增大四价钚的萃取。

It is important that studying gamma ray spectrometry of field rocks and soil in the earth抯 crust. Their energy range are mainly 30-3000keV, they contain abundant information of natural radioactive nuclides, such as uranium, thorium, potassium, etc, and of artificial radioactive nuclides from nuclear engineering activity, such as cesium, americium, cobalt, etc, and of the results in interaction between gamma ray and earth抯 crust.

国外近年已经生产出大于256道的伽玛射线能谱仪，但由于仪器应用滞后于仪器研究，且仪器稳谱未完全解决，获取全谱信息困难，加之对低能谱段的认识不足等原因，致使野外应用仍然滞留在仅限于测定铀钍钾含量的伽玛能谱测量水平上。

Subsequent redistribution of uranium in provinces formed at that time most probably resulted from orogenic processes and associated anatexis.

铀在成矿区内的重新分布，最可能是由于造山作用及伴随的泾熔作用。

The determination of free acidity with the presence of rare ,uranium,thorium andiron,etc is studied.

研究了在稀土，铀，钍及铁等元素存在下自由酸度的测定，标准回收完全，适用于稀土料液自由酸度的测定

The main paragenetic minerales are: uranophane, uranium blacks, autunite, meta-torbernite, microquartz, quartz, ankerite, calcite, fluorite, hydromica, pyrite, galena, sphalerite, and chalcopyrite.

矿化作用共可分为八个阶段，同位素研究结果表明，矿床中的铀主要来自岩浆溶液，部分轴来自围岩——侏罗系长石石英砂岩。沥青铀矿的同位素年龄为108—109百万年。

Who but Rick Steves can tell travelers the best way to see Arles, Avignon, the Cotes du Rhone, Marseilles, Aix-en-Provence, Nice, Monaco, Antibes, Cannes, St-Tropez, and the Inland Riviera?

描述谁，但瑞克Steves能告诉旅客最佳的方式看Arles、Avignon、贫铀棚雨水槽、马赛、艾克斯普罗旺斯，尼斯，摩纳哥、安地比斯、戛纳、StTropez和内地里维埃拉？

NATO ambassadors have rejected calls for moratorium on the use of antitank weapons containing depleted uranium.

北约各国大使们拒绝了暂停使用含有贫铀的反坦克武器的呼吁。

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。