Applicability of ~9Be global optical potential to reactions of ~(7,10,11,12)Be

Elastic scattering angular distributions and total reaction cross-sections of ~(7,10,11,12)Be projectiles are predicted by the systematic ~9 Be global phenomenological optical model potential for target mass numbers ranging from24 to 209. These predictions provide a detailed analysis by their comparison with the available experimental data.Furthermore, these elastic scattering observables are also predicted for some targets out of the mass number range.The results are in reasonable agreement with the existing experimental data, and they are presented in this study.     

~(32)S离子辐照PET薄膜制备亚微米孔径核孔膜研究

使用中国原子能科学研究院HI-13串列加速器产生的32S离子轰击BOPET薄膜,薄膜在空气中陈化3个月后在专用装置中使用Na OH溶液蚀刻制备核孔膜,研究Na OH溶液浓度、蚀刻温度对微孔孔形的影响。在不同温度和蚀刻液浓度条件下,蚀刻出微孔孔径为0.2至0.93μm的亚微米核孔膜,计算其微孔锥角,得出微孔锥角随着蚀刻温度、蚀刻液浓度和微孔孔径的变化趋势。研究表明,采用低浓度、高温度的Na OH溶液蚀刻有利于减小微孔锥角,有利于制备较小孔径的核孔膜。如选用0.5mol/L的Na OH溶液浓度,在蚀刻温度为90℃的条件下蚀刻,此时蚀刻时间小于2 h,既可以得到高质量微孔膜也有利于提高生产效率。     

在空气-乙炔焰中络合剂对镱的增感效应

本文在空气-乙炔焰中,借加入有机络合剂以提高能形成难离解氧化物的稀土的灵敏度。以镱为例,研究了含键合原子氧或氧、氮的络合剂对镱的增感效应和镱原子在火焰中的分布。Yb灵敏度达0.17μg/ml/1%吸收,选择性显著提高。本法用于合成样品中镱的测定,结果满意。     

稀土元素的原子吸收光谱分析研究(Ⅱ)——在空气-乙炔焰中双络合剂对镱的增感效应

本文在空气-乙炔焰中,研究了双络合剂体系对镱的增感效应,发现了三种增感类型.试验了无机酸、普通元素和非镱稀土的干扰及其消除.所拟定的方法用于合成试样中镱的测定,结果满意.     

Applicability of ~9Be global optical potential to description of ~(8,10,11)B elastic scattering

We achieved a set of 9Be global phenomenological optical model potentials by fitting a large experimental dataset of the elastic scattering observable for target mass numbers from 24 to 209.The obtained 9Be global optical model potential was applied to predict elastic-scattering angular distributions and total reaction cross-sections of 8,10,11B projectiles.The predictions are made by performing a detailed analysis comparing with the available experimental data.Furthermore,these elastic scattering observables are also predicted for some lighter targets outside of the given mass number range,and reasonable results are obtained.Possible physical explanations for the observed differences are also discussed.     

一种基于GAF拓扑控制的加权质心定位算法

针对无线传感器网络节点定位的能量均衡问题,提出采用蜂窝结构GAF算法进行拓扑控制的基础上,使用改进的加权质心算法进行节点定位。该算法通过区域划分增加信标节点选择的有效性,通过对距离加权减少多径效应影响。性能分析和仿真结果表明该算法可构造良好的网络拓扑结构,均衡节点能耗,延长整个网络的生存周期,提高节点定位精度,在密集型网络中可获得良好的定位性能。 更多还原