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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 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

Communications to and from a satellite.

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from article Communications satellite

Typical communications satellite. TWTA = traveling-wave–tube amplifier. (Credit: Space Systems/Loral)

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from article Communications satellite

Orbit periods of circular orbits.

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from article Medical waste

The uniform international biohazard symbol.

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from article Convection in the Earth

Pattern of magnetic stripes over the Reykjanes Ridge southwest of Iceland. (After J. R. Heirtzler, X. LePichon, and J. G. Baron, Magnetic anomalies over the Reykjanes Ridge, Deep Sea Res., 13:427, 1966)

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from article Convection in the Earth

Geographic setting of the Kurile Trench off the Kamchatka Peninsula, showing the deep ocean trench and the characteristic line of volcanoes in the vicinity of the subduction zone. The sections A′ and B′ illustrate the bathymetry normal to the trench…

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from article Convection in the Earth

Characteristic variation of heat flow and bathymetry. (a) Variation of surface heat flow as a function of age of the ocean floor in millions of years before present for the Pacific, South Atlantic, and Indian oceans. (b) Variation of sea-floor…

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from article Convection in the Earth

Global seismicity showing surface projections of all earthquakes which occurred during 1965–1975 with magnitudes in the range 4.5–5.5. Plate boundaries are located along the seams marked by high frequency of earthquake occurrence.