Three kinds of the basic Fréedericksz transition are investigated by means of the Fourier series expansion of variables describing the orientation of the director, upon which threshold magnetic field of TN liquid crystal cells is mainly studied.
采用对描述指向矢取向的变量进行傅里叶级数展开的方法,研究了三种基本的Fréedericksz转变,并在此基础上重点讨论了TN液晶盒的阈值磁场。
参考来源 - 空间各向异性势向列液晶盒的Fréedericksz转变·2,447,543篇论文数据，部分数据来源于NoteExpress
Further, by double FOURIER series expansion and intricate derivation, strict output analytic solution is acquired.
针对模型，通过双fourier级数展开和繁琐的数学推导，求得了输出电压的严格解析表达式。
Through analysis of the current waveform of the semi-control double three-phase 12-pulse rectifier and the expansion of Fourier series, the main harmonic components of the system were obtained.
通过对半控双三相12脉冲整流器的电流波形分析和傅立叶级数展开，得出系统的主要谐波成分。
Basically, the traditional way may involve method of time series, multi-linear regression and the Fourier expansion, etc.
传统方法中主要有时间序列法、多元线性回归法及傅立叶展开法等。
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