In this paper, we discussed the transition selection rule of electrical dipole radiation in atom physics by the parity theory and angular momentum theory in quantum.
本文利用量子力学的宇称理论和角动量理论，对原子物理学中所熟知的电偶极辐射的跃迁选择定则进行了理论探讨。
A computer program is given for log-periodic dipole antenna (LPDA) design with the "Three-Term" theory. The program can quickly design and optimize physical or electrical parameters of LPDA.
本文给出了用“三项理论”设计对数周期偶极天线(以下简称LPDA)的计算机程序，它能快速地设计出该天线的各几何参数和电参数，并可进行优化。
An analytical expression of potential field is derived based on a viewpoint of polarized dipole and electrical current.
导出了基于极化偶极和电流观点的位场解析表达式。
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