The dissertation presents the characteristics of the pulse obtained from the purely and doubly Q-switching laser of ground frequency, the doubly Q-switching laser of doubly frequency.

本论文我们主要研究了基频单调q、基频双调q及倍频双调q激光器的输出脉冲特性。

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These higher-frequency sounds do not travel as far, and so may better conceal the individuals producing them, who are especially vulnerable to predators in their ground nests.

这些高频声音传播得没有那么远，因此可能更好地隐藏了发出这些声音的个体，它们在自己的地面巢穴中特别容易受到捕食者的攻击。

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To reach the ground state, physicists had to cool their beams to nearly absolute zero.They also had to make the quanta as large as possible by making a beam stiffer to increase its frequency.

为了实现真正的基态，物理学家不得不将光束冷却到接近绝对零度，他们还要通过使光束保持静止来增大其频率，让量子尺度变得尽可能大。

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The closures will not force the shutdown of any of those airports, but pilots will be left to coordinate takeoffs and landings among themselves over a shared radio frequency with no help from ground controllers.

NPR: FAA To Close 149 Air Traffic Towers Under Cuts

Bombard an ordinary hydrogen atom with microwaves of the right frequency and you will lift it out of its ground state by flipping the spin of its electron.

ECONOMIST: Are matter and antimatter truly opposites?