In this paper, a novel method called the variational iteration method is proposed to solve perturbation problems.
本文提出了求解摄动问题的一种新方法——变分迭代算法。
2
The course also examines approximation methods: WKB method, variational principle, and perturbation theory.
同时，本课程也解释了几种常用的近似方法：WKB方法、变分原理、以及微扰理论。
3
In this paper, resonant frequency of the deformed circular microstrip antennas is investigated based on variational principle and the perturbation concept.