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air pollution
(Encyclopedia)air pollution, contamination of the air by noxious gases and minute particles of solid and liquid matter (particulates) in concentrations that endanger health. The major sources of air pollution are t...Boyd, Alan Stephenson
(Encyclopedia)Boyd, Alan Stephenson, 1922–2020, U.S. government official, first secretary of transportation (1967–69), b. Jacksonville, Fla. After serving in the Army Air Forces in World War II, he graduated fr...automatic frequency control
(Encyclopedia)automatic frequency control: see automatic tuning control. ...automatic tuning control
(Encyclopedia)automatic tuning control (ATC), method or device to keep a radio or television receiver automatically tuned to a desired frequency or channel. Assuming that the receiver is at least approximately tune...riot-control gas
(Encyclopedia)riot-control gas: see poison gas; tear gas. ...right of way
(Encyclopedia)right of way, in land and air traffic and in sea navigation, rules that determine precedence in the use of traffic lanes. The rules are framed in the simplest possible terms and with nearly absolute u...Nashua
(Encyclopedia)Nashua năshˈo͞oə [key], city (1990 pop. 79,662), seat of Hillsborough co., S N.H., on the Merrimack and Nashua rivers near the Mass. line; settled c.1655, inc. as a city 1853. Because of the avail...Senkaku Islands
(Encyclopedia)Senkaku Islands sĕnˈkäko͞o [key], small, uninhabited island group, 8 sq mi (20.7 sq km), Okinawa prefecture, extreme SW Japan, in the East China Sea. Located 90 mi (45 km) NNW of Ishigaki in the R...Strategic Air Command
(Encyclopedia)Strategic Air Command (SAC), former command of the U.S. air force (see Air Force, United States Department of the) charged with organizing, training, equipping, administering, and preparing strategic ...air-cushion vehicle
(Encyclopedia)CE5 Air-cushion vehicle: In vehicles modified with a trunk or skirt (A), the rate of leakage is reduced and less power is needed to maintain the cushion. Vehicles designed to travel over deep water...Browse by Subject
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