The FM noise and AM noise of a negative frequency feedback (NFFB) semiconductor laser(LD)are presented.

本文用半经典理论研究了负频反馈（NFFB）半导体激光器的FM和AM噪声。

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For rectangular window FFT interpolation algorithm, the negative frequency components of harmonic components have a greater impact on the fundamental calculation error.

采用加矩形窗fft插值算法，谐波的负频分量对谐波计算的误差影响较大。

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A new signal processing method for Coriolis mass flowmeter is proposed, which is based on the recursive DTFT algorithm and considers the contribution of negative frequency.

基于DTFT递推算法，提出了一种计及负频率影响的科里奥利质量流量计信号处理方法。

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But May 6 could happen again and the SEC needs to be prepared, according to James Angel, a Georgetown finance professor who has been warning about the possible negative effects high frequency trading since last year.

FORBES: High Frequency Traders Face SEC/CFTC Panel

Overdahl insists, however, that the firms are not adopting a new name because of any negative overtones to high-frequency trading, which remains important to many of them.

FORBES: Market Players

They ranked the locations based on frequency of positive and negative words using the Mechanical Turk Language Assessment word list.

CNN: The happiest and saddest states according to Twitter