The ground state energies of a shallow donor impurity near a sharp surface of a semi-infinite crystal are studied.
本文用变分法计算了半无限晶体近表面内浅态施主杂质的基态能量。
The characteristics of photonic forbidden band and impurity mode in doped one-dimensional photonic crystal were investigated by numeral simulated calculation with the method of characteristic matrix.
运用光在分层介质中传播的特征矩阵方法，通过数值计算，研究了掺杂一维光子晶体中光子禁带及杂质模的特性随不同偏振光及入射角的变化。
Method was introduced to refine phosphatidylcholine from rude soybean lecithin using alcohol and remove impurity by refrigerating crystal in the condition of low temperature.
该文研究了在低温条件下，用乙醇作为溶剂，通过冷冻结晶去杂，从粗制大豆磷脂中精制磷脂酰胆碱的方法。
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