| 1. | Two - dimensional frequency estimation based on nonlinear prefiltering in frequency domain
二维谐波频率的频域非线性预滤波估计方法 |
| 2. | Two - dimensional harmonics frequency estimation in additive gaussian noise background based on quaternion and hypercomplex
四元数和超复数在加性高斯噪声背景下二维谐波频率估计中的应用 |
| 3. | " the crystal resonator " . a subharmonic of the frequency of quartz crystal . extremely effective for charging and clearing quartz crystals . activates aspects of the auric field
“水晶共振”次谐波频率的石英水晶。非常有效去充电和清除石英水晶。启动有关灵光场。 |
| 4. | By regulating the compensation current injecting into the compensation winding of the reactor , the reactor inductance at different harmonic frequencies can be independently and continuously adjusted
有源电抗器由一对耦合绕组和一个补偿电流发生器组成，通过控制有源电抗器补偿绕组中的谐波磁通补偿电流，可以独立且连续地调节电抗器在不同谐波频率下的电感量。 |
| 5. | Fourier transform method use high order frequency to analyse and imitate nonlinear and non - stationary data . emd method based on local characteristic time scale of the data is more fit to analyse nonlinear and non - stationary data than fourier transform method
Emd基于信号的局部时间特征尺度分析原信号，克服了傅里叶变换用高次谐波频率分量拟合非线性、非平稳信号的缺点。 |
| 6. | The studying results show that the advanced spectral estimation is more predominant than dft algorithm and its corrected algorithms in the field of inter - harmonics measuring , especially for the inter - harmonics which is too close to harmonics . hence , it is effective and feasible to introduce the advanced spectral estimation into inter - harmonics measuring
上述研究证明,在间谐波检测领域,特别是对离谐波频率较近的间谐波检测中,现代谱估计理论有着许多dft算法及其校正算法不可比拟的优势,将其引入电力系统间谐波检测中是有效可行的。 |
| 7. | It is found that the electron beam may approach ideal bunching . high power microwave pulses with tunable frequency can be generated by post - accelerating the electron beam and carefully designing the extraction cavity . in terms of the pic simulation , the output power of 1 . 25gw at 2 . 2ghz and 480mw at 4 . 4ghz in axial acceletron have been obtained
用增加中间腔的办法，大大提高了前两阶谐波电流分量，数值计算结果表明，其中一阶谐波电流调制系数达到了140 ，二阶谐波电流调制系数达到了68 ，通过改变提取腔的设计，可选择不同频率的输出，其一次谐波频率为2 . 2ghz ,输出功率为1 . 25gw ,效率为9 . 33 ，二次谐波频率为4 . 4ghz时，输出功率为0 . 48gw ，效率为3 . 6 。 |
| 8. | In the distribution system , many capacitor banks are applied to decrease the loss of the network . the harmonic resonance may be incurred between the network and the capacitor banks in the harmonic frequency , thus the security of the system may be destroyed because of the high harmonic distortion level
配电网中装设了大量的电容器进行无功优化来降低网损，但在谐波频率下，容易产生系统与电容器之间的谐波谐振或谐波放大，从而使系统的谐波畸变率变大，破坏了系统的安全运行。 |
