非线性Af一Bg型自由基交替共聚反应的固化理论

利用高分子反应统计理论,给出了非线性Af-Bg型自由基交替共聚反应的溶胶-凝胶分配方程和反应体系的凝胶化条件,这些结果是进一步研究与凝胶网络性能相关的网络结构参数的基础．     

非线性Af—Bg型自由基交替共聚反应的凝胶网络结构参数

利用高分子反应统计理论,计算了非线性Ａｆ－Ｂｇ型自由基交替共聚反应凝胶网络中的弹性有效链和悬吊链的链数及相应的链节数,进而计算出弹性有效链的数量和质量分数、有效交联点数和弹性量等网络结构参数。     

火焰原子吸收光谱法测定蜂蜜中的钙和锌

报道了用直接消解法处理蜂蜜,在选定光谱条件下,用火争原子吸收分光光度计测定其中的钙和锌,与湿法,干法消解处理的试样相比较,该法操作简单,结果令人满意,加标回收率钙为99－101．9％。锌为98．8％－105％,相对标准偏差钙为4．4％－5．9％,锌为2．1％－3．8％检出限钙为0．138ug.mL^-1,锌为0．084ug.mL^-1。     

Effect of Spontaneous Emission on Both Atomic Dynamics and Momentum Transfer of an Atom-cavity System

The dynamics of an atom coupling to a quantized cavity field have been studied. The atom is treated as a two-level system with a spontaneous emission rate. The transition probabilities have been given for both adiabatic and non-adiabatic situations. For a special Λ-type atom with dark state, the problem of momentum transfer is discussed in details. The influence of spontaneous emission on validity of the adiabatic approximation is also discussed.