Up to that point, chapters 1 through 4 cover the general scientific method, experiment and observation, and simple systems and definitions.
到现在为止，第1章到第4章介绍了一些通用的科学方法、实验和观测，以及一些简单的系统和定义。
The impedance matrix element is calculated by the dipole model method when the distance between the equivalent dipole element and the observation point is beyond a critical distance.
当等效偶极子单元离观察点大于临界距离时，用偶极子模型法计算阻抗矩阵元素。
Using perturbation and observation method, a maximum power point tracking controller, the solar-cell can achieve maximum power control in accordance with illumination.
另使用扰动观察法作为最大功率追踪控制器，使太阳能电池达到最大功率控制。
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