Columbia Encyclopedia

Search results

500 results found

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. ...

radiation chemistry

(Encyclopedia)radiation chemistry: see radiochemistry. ...

Allen, Richard

(Encyclopedia)Allen, Richard, 1760–1831, American clergyman, founder of the African Methodist Episcopal Church. He was born a slave in Philadelphia and purchased his freedom. He became pastor of a black group tha...

Allen, William

(Encyclopedia)Allen, William, 1704–80, American jurist, b. Philadelphia. He and his father-in-law, Andrew Hamilton, decided the choice of Philadelphia instead of Chester as provincial capital, and he helped finan...

Say, Allen

(Encyclopedia)Say, Allen, 1937–, Japanese-American writer and illustrator of children's books, b. Yokohama, Japan, as James Allen Koichi Moriwaki Seii. After an apprentceship with a well-known cartoonist, the bas...

Allen, Gracie

(Encyclopedia)Allen, Gracie: see Burns, George. ...

Tate, Allen

(Encyclopedia)Tate, Allen (John Orley Allen Tate), 1899–1979, American poet and critic, b. Winchester, Ky., grad. Vanderbilt Univ., 1922. He was one of the founders and editors of the Fugitive (1922–25), a maga...

ionosphere

(Encyclopedia)ionosphere īŏnˈəsfēr [key], series of concentric ionized layers forming part of the upper atmosphere of the earth from around 30 to 50 mi (50 to 80 km) to 250 to 370 mi (400 to 600 km) where it m...

Allen, Hervey

(Encyclopedia)Allen, Hervey, 1889–1949, American novelist and poet, b. Pittsburgh, grad. Univ. of Pittsburgh, 1915. After service in World War I, he taught English in Charleston, S.C., where, in collaboration wit...

Van

(Encyclopedia)Van vän [key], city (1990 pop. 153,525), capital of Van prov., E Turkey, near the eastern shore of Lake Van, at an altitude of 5,659 ft (1,725 m). It is the trade center for a fruit- and grain-growin...