作者: William J.

The micro-Doppler effect appears as Doppler frequency modulations in coherent laser or microwave radar systems induced by mechanical vibrations or rotations of a target or any part on the target. The …

<p>Freya Grace, a college student, went on vacation with five friends ten years ago and returned alone, the sole survivor of a horror movie-scale massacre. In an instant, she became a member of …

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