Na原子3p2P3/2态超精细结构的计算

采用SIC-Xα方法,计算了Na原子3p2P3/2态的磁性超精细相互作用耦合系数A,理论计算与实验结果符合得较好。对于电超精细结构,通过理论计算给出电场梯度值q,再由电性超精细相互作用常数B的实验值,得出原子核的电四极矩Q,由此计算出Na原子核的大致结构。这是用原子物理的方法研究原子核问题的有益尝试。     

Preparation, structure, and properties of polyurethane foams modified by nanoscale titanium dioxide with three different dimensions

TiO2-based nanosheets (TiNSs), TiO2-based nanotubes (TiNTs) were prepared by hydrothermal processing, and polyurethane foams with TiO2 nanopowders (P25), TiNSs and TiNTs were synthesized by free-rising foaming method. The Fourier-transform infrared (FT-IR) spectra show that the addition of titanium dioxide does not affect the chemical structure of polyurethane foam. However, microscope observations show that PU/TiNSs composite foams have more uniform cells and the average aperture smaller than that of pure poly-urethane foams. According to the results of thermal analysis, the PU/TiNSs composite foams have better thermal stability, the temperature of decompostion occurring with a maximum weight loss rate is about 30 ℃ higher than that of pure PU foams. The decompostion temperatures are 167 ℃ and 148 ℃ for the PU/P25 composite foams and the PU/TiNTs composite foams respectively, which are lower than that of pure PU foams. Moreover, with the addition of the fillers, the sound absorption property also has changed; the addition of TiNSs improved the sound absorbing property efficiently. The better thermal stability and sound absorption of PU/TiNSs composite foams are mainly due to the uniform cells diffuse and smaller aperture.     

火焰原子吸收分光光度法测定尾砂矿中的微量铟

以HCl、HNO3、HF、HClO4溶解样品,釆用火焰原子吸收分光光度法测定尾砂矿中的铟含量,对仪器的工作条件和反应条件进行了选择和优化。该方法线性范围为0～10μg.ml-1,线性方程y=0.001809＋0.01497x,相关系数为0.9994,检出限0.090μg.ml-1,RSD=1.39%,回收率96.0%～106.0%。该方法操作简便,准确度和精密度能够满足分析要求。     

一个用原子激光测量引力场微小变化的实验设计

利用原子激光良好的相干性,以及在引力场中会发生相位变化的特点,设计一个能够测量引力场微小变化的实验方案.     

光声光谱技术在白血病诊断中的应用

建立一套用于血液涂片或固体研究的双光束光声光谱测量装置,实验研究正常人、急性淋巴细胞白血病等血样的光声光谱,发现白血病人的全血谱与正常人全血谱有显著的差别.结合临床,分析讨论了白血病人全血谱与病情程度的关系,并利用瑞士兰对全血涂片染色的方法,为白血病进行早期诊断找到了一种简便的手段.     

介质吸收对体积全息图衍射效率的影响

给出了体积全息图的衍射效率与记录介质吸收系数和厚度的关系,指出必须考虑制做全息图时介质吸收的影响,并提出了改善体积全息图性能的方法.     

论火焰原子吸收法测镁时铝干扰的机理

用熔融体性质对杂质蒸发速度的影响解释了火焰原子吸收法栅镁时对铝的干扰以及镧对铝干扰的抑制作用。推论出高沸点氧化物都有抑制铝干扰镁的作用,并得到了实验证实。     

非晶态合金Pd77.5Ag6.0Si16.5中含氢引起的内耗峰

用倒扭摆研究了非晶态合金Pd_(77.5)Ag_(6.0)Si_(16.5)的低温内耗和切变模量行为.经电解充氢后在120—130K范围内发现一个弛豫型内耗峰,随氢含量的增加,峰高增大,峰温移向低温,退火去氢后则具有可逆趋势.弛豫激活能为0.28±0.05eV.氢内耗峰的微观机制,是处于四面体或八面体中间隙位置的氢原子应力感生有序.