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Typical plot of minimum value of nτ necessary for net release of energy versus ion kinetic temperature in a mixture containing equal amounts of deuterium and tritium. (After J. M. Hollander, ed., Annu. Rev. Energy, 1:213–255, 1976)

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from article Vibrotaction

Block diagram of apparatus for determining vibrotactile perception thresholds at the fingertip.

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from article Vibrotaction

Tactogram showing the approximate maximum threshold recorded at the fingertips of healthy persons (horizontal line), and examples of two types of threshold elevation (reduction in acuity) at selected frequencies (circles and squares).

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from article Communications satellite

Artist impression of TDRS-L, the 11th member of NASA's Tracking and Data Relay Satellite System, orbiting Earth at 36,000 km (22,300 mi). TDRS-L sends signals, information, and commands from ground controllers to the International Space Station and…

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from article Communications satellite