...omotor）调速性能可与直流电机媲美，交流调速技 术（AC Speed Control Technique）、变频技术（Frequency Inversion Technique）开始大量应用并逐步取代直流调速。
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In order to improve the power parameter further, the intermediate frequency inversion of an electric voltage power type series resonance and frequency trace technique are adopted.
为使系统的功率因数较高，采用电压源型负载串联谐振中频逆变器和频率跟踪技术。
Proton NMR two dimensional time-domain data are collected based on the inversion-recovery technique. Double Fourier transformation of those data yields the two dimensional frequency-domain data.
基于反转恢复法建立质子nmr二维时域数据，经双重付里叶变换获得二维频域数据。
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