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sonic boom

(Encyclopedia)CE5 Sonic boom wave pattern from a supersonic aircraft and variation in pressure sonic boom, shock wave produced by an object moving through the air at supersonic speed, i.e., faster than the spee...

baby boom

(Encyclopedia)baby boom, a period in which the birthrate is significantly higher than in other periods, especially the post–World War II period in the United States, Canada, Australia, and New Zealand. In the Uni...

Cherenkov radiation

(Encyclopedia)Cherenkov radiation or Cerenkov radiation [for P. A. Cherenkov], light emitted by a transparent medium when charged particles pass through it at a speed greater than the speed of light in the medium. ...

Marler, Peter Robert

(Encyclopedia)Marler, Peter Robert, 1928–2014, British ethologist, b. Slough, England, Ph.D University College London, 1952, and Cambridge, 1954. At Cambridge he was introduced to the sonic spectrograph, an instr...

crane, machine

(Encyclopedia)crane, hoisting machine for lifting heavy loads and transferring them from one place to another, ordinarily over distances of not more than 200 ft (60 m). Cranes have a long reach and can lift loads t...

Elliot Lake

(Encyclopedia)Elliot Lake, city, S central Ont., Canada, W of Sudbury. The focus of a 1950s uranium-mining boom, it is now a retirement home center. Uranium mining en...

shaduf

(Encyclopedia)shaduf or shadoof both: shədo͝ofˈ, shäˈdo͝of [key], primitive device used to lift water from a well or stream for irrigation purposes. Essentially the device consists of a long boom balanced acr...

Pleasant Hill

(Encyclopedia)Pleasant Hill, residential city (1990 pop. 31,585), Contra Costa co., W Calif.; inc. 1961. First settled in 1844, the area remained rural until the housing boom of World War II. Electronic equipment i...

Plantation

(Encyclopedia)Plantation, city (1990 pop. 66,692), Broward co., SE Fla., a residential suburb of Fort Lauderdale; inc. 1953. The city has grown rapidly along with the development of S Florida. Major housing develop...