去年，耶鲁大学的一群物理学家想出了一个叫作时间反演激光器的东西，来实现这个逆过程。

Last year, a group of physicists at Yale University proposed a way to do just that with something called a time-reversed laser.

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应用担普拉斯数值反演方法分析了群桩垂向粘弹性动力反应。

This paper presents the analysis of the vertical viscoelastic dynamic responses of pipe group by Laplace numerical inversion method.

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计算结果表明，微粒群算法具有概念简单、容易实现、计算速度快等优点，适合应用于面板堆石坝坝料参数反演分析。

The results indicate the validity of improved PSO methods in the back analysis of the mechanical parameters of concrete face rock-fill dam.

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