在这个500年期间，有两个灾难性的动乱时段和三个相对平静的时期，它们与气温的变化呈反相位的波动。
Two periods plagued by unrest and warfare and three relatively peaceful periods follow the temperature undulation inversely.
本文提出了一种相位干涉法。用来测量表面声波速度的相对变化。
A phase interference method, for measurement of the relative change of surface acoustic wave velocities, is presented.
计算机模拟的结果表明，这种滤波法对输入信号的旋转变化和尺度缩放变化，相对于传统的匹配滤波法及仅相位滤波法要敏感得多。
Computer simulations show that this kind of filter is much more sensitive as compared to a matched spatial filter or a phase-only one.
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