The frequency of a laser-diode can be locked by providing a negative feedback voltage to the piezo-electric transducer in the laser cavity. By phase-modulating the light and placing sidebands on the carrier frequency, the fluorescence of the atoms...
Throughout the long history of the Church's struggle to take seriously the biblical precepts for peacemaking, the changing context has always brought with it a difficulty in being a witness to peace in a world gripped by violence. The Viking raids...
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