After Pearl Harbor, the Japanese planned to strike the United States with aircraft borne by giant submarines.

Is there an example design in nature for the perfect acceleration shield? In effect, there is, and it is the egg. We studied the coupling of water immersion with liquid breathing as a possible approac...

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Canada must choose between the stealthy German Type 212CD and the powerful Korean KSS-III. Which submarine best secures Canada’s future?

The cavity magnetron is a high-power vacuum tube used in early radar systems and subsequently in microwave ovens and in linear particle accelerators. A cavity magnetron generates microwaves using the interaction of a stream of electrons with a magnetic field, while moving past a series of cavity resonators, which are small, open cavities in a metal block. Electrons pass by the cavities and cause microwaves to oscillate within, similar to the functioning of a whistle producing a tone when excited by an air stream blown past its opening. The resonant frequency of the arrangement is determined by the cavities' physical dimensions. Unlike other vacuum tubes, such as a klystron or a traveling-wave tube (TWT), the magnetron cannot function as an amplifier for increasing the intensity of an applied microwave signal; the magnetron serves solely as an electronic oscillator generating a microwave signal from direct-current electricity supplied to the vacuum tube.

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In the latest Pop Culture Questions Answered, discover the origins of the popular film term, "McGuffin."