The Fourier spectrum of the wave moment shows that high frequency components will appear and they may cause ringing.

分析结果表明，极端波浪作用下的波浪力矩包含高频成分，是结构物可能产生高频共振响应的原因。

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Second, a special 2-D the fourth-order time-average moment spectrum is defined to estimate frequency in zero mean multiplicative and additive noise.

定义了特殊的二维四阶时间平均多矩谱来估计信号频率。

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Because the Local wave T-F spectrum can be showed in the gray image, so we use the moment invariants of time-frequency image as the fault features.

由于局域波时频谱可以表示为灰度图像。因此，利用图像信息的不变矩进行故障特征提取。

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Why else would it ask for a 2nd lien on the spectrum nobody at the moment can figure out how to use?

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Masayoshi Son of Softbank, made a bid for Sprint, most likely to gain control of the vast Clearwire spectrum position almost but not quite controlled by Sprint at that moment.

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At the moment, the best hope is to use broad-spectrum antiviral drugs until a suitable vaccine can be developed and deployed.

ECONOMIST: A new way to protect against infection is undergoing tests