neptunium n.【化學】镎〔舊譯錼〕。
n. 【化學】镎〔舊譯?〕。 “eka-neptunium“ 中文翻譯： 镎下元素“neptunium acetate“ 中文翻譯： 醋酸镎“neptunium alkoxide“ 中文翻譯： 烷基醇镎“neptunium alloy“ 中文翻譯： 镎合金“neptunium amalgam“ 中文翻譯： 镎汞齊“neptunium analyzer“ 中文翻譯： 镎含量分析儀“neptunium carbide“ 中文翻譯： 碳化镎“neptunium carbonate“ 中文翻譯： 碳酸镎“neptunium chloride“ 中文翻譯： 氯化镎“neptunium complex“ 中文翻譯： 镎絡合物“neptunium dioxide“ 中文翻譯： 二氧化镎“neptunium ethoxide“ 中文翻譯： 乙氧基合镎“neptunium family“ 中文翻譯： 镎系“neptunium fluoride“ 中文翻譯： 氟化镎“neptunium hydride“ 中文翻譯： 氫化镎“neptunium hydroxide“ 中文翻譯： 氫氧化镎“neptunium ion“ 中文翻譯： 镎離子“neptunium isotope“ 中文翻譯： 镎同位素“neptunium nitrate“ 中文翻譯： 硝酸镎“neptunium oxalate“ 中文翻譯： 草酸镎“neptunium oxide“ 中文翻譯： 氧化镎“neptunium peroxide“ 中文翻譯： 過氧化镎“neptunium phosphate“ 中文翻譯： 磷酸镎“tetracyclopentadienyl neptunium“ 中文翻譯： 四環戊二烯合镎“neptunite“ 中文翻譯： 柱星葉石“neptunist“ 中文翻譯： n. 【地質學；地理學】巖石水成論者。
neptunium series |
|
The effects of equilibrium time , acidity of the solution , temperature , concentration of redox reagents on the adsorption of neptunium by silica gel were carried out . desorption and isotherm adsorption experiments were also performed . the results are shown as follows : the equilibrium for adsorption of neptunium on silica gel reached rapidly 進行了吸附平衡時間、酸度、溫度、氧化還原劑濃度等條件對硝酸溶液中np ( ) 、 np ( )和np ( )在硅膠上吸附的影響的實驗，與吸附時同酸度條件下的洗脫實驗，用濃度為3mol l的硝酸作為解吸劑的解吸實驗。 |
|
With the development of nulear power industry , more and more attention has been given to the spent nulear fuel reprocessing . purex process will remain predominant in the foreseenable future . because the valence of np , one kind of transuranium elements , is easy to interchange , the route of np in purex process is difficult to be controled . a lot of work has been done on the control of neptunium way in the world 隨著核電的發展，乏燃料后處理引起了人們的廣泛關注。 purex流程在乏燃料后處理中一直占有主導地位。由于超鈾元素np的化學價態容易相互轉變，使purex流程中np的走向不易控制而傾于分散。 |
|
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 三種價態的镎在硅膠上吸附的等溫線符合蘭格繆爾吸附等溫線的形式，是單分子層吸附；根據克勞修斯-克拉柏龍方程，以1nkd對1 t作圖，通過直線斜率計算出吸附熱，從吸附熱的數據可判斷三種價態的镎在硅膠上的吸附屬于化學吸附，是吸熱的過程；對npov ） 、 np （ v ）和np （ vd在硅膠上的吸附進行了比較，提出了三種價態的鋒在硅膠上吸附的機理。 |
|
The path - way controlling of neptunium in co - decontamination step of purex process , the extraction thermodynamics of amido podand and its usage in recovery of actinides from simulated hllw have been investigated . more than 95 % np were maintained in np ( v ) in 1a extractor and flowed into 1 aw , if enough amount of hno2 was added in feed adjustment and then hno2 scavenger ( urea ) was added before extraction . three kinds of amido podand were synthesized , and the extraction of lanthanides , actinides and some fission products were studied . one of them ( tbopda , n , n , n ' , n “ - tetrabutyl - 3 - oxa - pantenadiamide ) was used as extractant to recover actinides from hllw . the results of experiments show that more than 99 . 99 % actinides were recovered from hllw and separated basically in groups . the main digests are as follows : 1 镎走向控制研究中通過調價階段加入亞硝酸、而萃取前清除亞硝酸的獨特辦法可以將大于95的镎趕入1aw 。合成了三種酰胺莢醚萃取劑，研究了它們對錒系和裂片元素的萃取熱力學，通過條件實驗選擇了其中一種莢醚tbopda ( n ， n ， n ’ ， n ’ ?四丁基? 3 ?氧戊二酰胺) ，進行了從模擬高放廢液中分離錒鑭系元素的工藝研究，錒系的回收率大于99 . 99 ，并且基本上實現了錒鑭元素的組分離。其要點如下： 1 |
|
The desorption experiments in the same ph of solutions as adsorption experiments show that the desorption coefficient is bigger than the adsorption coefficient , so the adsorption of neptunium on silica gel in nitric acid belongs to irreversible process 用239np溶液進行上述實驗后，又用239np與237np的混合溶液或237np溶液進行了上述部分實驗以比較微克量的237np和示蹤量的239np在硅膠上的吸附行為。 |
|
One of important methods in separation of neptunium from u , pu is selectively reducing np ( vi ) to np ( v ) which cannot be extracted by 30 % tbp / ok , while the valence of u , pu remains stationary 其中一個重要的思路就是將np ( )選擇性地還原為不被30 tbp煤油萃取的np ( ) ，同時保持u 、 pu的價態不變，從而實現np與u 、 pu的有效分離。 |
|
Since the half - lives of neptunium - 237 and its daughter radionuclides are relatively short comparing to the age of the earth , these radionuclides are not present in the earth nowadays 由于- 237及其子體核素的半衰期遠低于地球的年，它們現已不存在于地球上。相反， |
|
Nuclear energy . technology of nuclear fuel cycle . determination of neptunium in nitric acid solutions by molecular absorption spectrophotometry 核能.核燃料循環技術.分子吸收分光光度法測定硝酸溶液中的镎 |
|
Standard test method for measuring reaction rates by radioactivation of neptunium - 237 用镎237的放射激活性測定反應速率的測試方法 |
|
Standard guide for determination of neptunium - 237 in soil 測定土壤中镎237的標準指南 |