| 1. | Uranium enrichment means the ratio of the combined weight of the isotopes 233u and 235u to that of the total uranium in question
铀富集度是指同位素~ ( 233 ) u和~ ( 235 ) u的质量之和与总铀量之比。 |
| 2. | At the same time , the code can be used in hpge spectrum analysis . in the enrichment range of 1 % - 90 % , the accuracy is about 10 %
同时，该程序也可用于铀的hpge能谱分析，在1 - 90的铀富集度范围内，计算精确度达到了10左右。 |
| 3. | Several spectra with various enrichments are analyzed in different conditions , the best condition of fitting is obtained , and the best results are achieved
通过对不同铀富集度的能谱数据，在不同条件下进行计算，确定了铀的能谱分析的最佳条件，并得到较好的分析结果。 |
| 4. | Based on metallogenic condition , types , characteristics of the gold deposits and concentration of gold mineralization and exploration intensity 15 gold metallogenic belts are delineated in china
根据成矿条件、矿床类型、矿床特征、矿化富集度以及工作程度，可将全国金矿划分为15个成矿区（带） 。 |
| 5. | For the cdznte spectrum with worse resolution , the analysis results show that the method can distinguish high - enriched uranium and low - enriched uranium , and work out the enrichment data in low precision
对能量分辨率较差的cdznte能谱而言，该方法能够较好地区分高浓铀和低浓铀样品，并在较低的精确度下给出了铀富集度的数据。 |
| 6. | Uranium enrichment measurement and attributes determination are important activities in mc & a system and routine safeguards inspections . y - ray spectrometry is important one of nda methods widely used in nuclear safeguards
铀样品的富集度分析及属性判定是核保障中衡算测量和核查测量的重要内容，能谱分析方法是核保障无损分析( nda )技术中重点研究的方法。 |
| 7. | The available phosphorus contents of the run - off from the plot iii and plot iv were higher than that of other two plots " run - off . the nutriments of sediments from the four plots were higher than the nutriments of soil in the plots . the plot ii and plot iv had the higher enrichness degree of total nitrogen than the other two plots ; the available nitrogen enrichness of sediments from plot iv was the highest , that of from plot illwas the lowest ; the available phosphorus enrichness of sediments from plot iv was the highest , that of from plot illwas the lowest ; the available potassium enrichness of sediments from plot ivwas the highest , that of from plot ii was the lowest
泥沙各种养分含量均高于小区内耕作层土壤中的相应养分含量，表现为：第2 、 4小区的流失土壤全氮养分富集度高于其余两个小区；第4小区流失土壤有效氮富集度最高，第2小区次之，而第1小区和第3小区的流失土壤有效氮含量与区内耕层土壤相似；各小区流失土壤中速效磷富集度为第4小区最大，第3小区最小；而第4小区耕层土壤中在流失过程中速效钾西南农业大学二oo二届硕士学位论文一积累量最大。 |
| 8. | In the analysis process , the six main peaks in 88 - 100 kev region , including the y peaks of 234th , the k peaks of th and the k peaks of u , are chosen . the smoothly joined gaussian function and low energy exponential tail is taken as peak shape function and quadratic polynomial is taken as background function . the two functions are fitted to gether to calculate the peak area
在分析过程中，选择了88 - 100kev能区的~ ( 234 ) th的射线峰， th的k _射线峰以及u的k _射线峰共六个主要能峰，通过采用高斯函数和低能指数尾部光滑联接的峰形函数和二次多项式本底函数一起拟合，来求出峰面积；而该能区所有能峰的探测效率可以认为是近似相等的，由此得到铀富集度。 |
| 9. | Ann methods are feasible for the verification measurements in nuclear safeguards . experimental data sets have been used to study the performance of neural networks involving radial basis function neural network and generalized regression neural network ( grnn ) . the optimization of the parameter spreads have been given and the analysis error of grnn no more than 0 . 2 %
分析结果表明，使用泛化能力较高的混合训练集训练神经网络，网络给出的富集度值与标准样品的标称值之间的相对差异小于13 % ；使用泛化能力相对较弱的分组训练集训练神经网络，网络给出的分析结果的不确定度小于2 % ；使用分组训练集和广义回归神经网络，网络给出的分析结果的不确定度小于0 |
| 10. | In this work , a method is brought out to determine the uranium enrichment by analyzing the cdznte spectrum in 88 - 100kev region , through the y - rays and x - rays emitted from uranium isotopes and their daughters . a code is developed , and the method is verified through its analysis results
本工作通过对铀的cdznte能谱进行分析，提出了一种利用铀及其衰变子体在88 - 100kev能区的射线和特征x射线来粗略测定铀富集度的一种方法，并开发了能谱分析程序，通过分析结果初步验证了该方法的可行性。 |
