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semiconductor

(Encyclopedia)CE5 N-type and P-type crystals: In a pure silicon crystal each silicon atom (Si) is surrounded by four valence electrons. In the N-doped semiconductor, illustrated in the left-hand figure, some sil...

pulley

(Encyclopedia)CE5 Pulleys: The mechanical advantage (MA) of a system of pulleys is equal to the number of supporting strands: in A MA=1 and in B MA=2. pulley, simple machine consisting of a wheel over which a r...

Pali canon

(Encyclopedia)Pali canon päˈlē [key], sacred literature of Buddhism. The texts in the Pali canon are the earliest Buddhist sources, and for Theravada Buddhists, who claim to conserve the original teachings of th...

McCormick, Cyrus Hall

(Encyclopedia)McCormick, Cyrus Hall, 1809–84, inventor of the reaper, b. Rockbridge co., Va. His father, Robert McCormick (1780–1846), had worked intermittently for over 20 years at his blacksmith shop on a rea...

koan

(Encyclopedia)koan kōˈän [key] [Jap.,=public question; Chin. kung-an], a subject for meditation in Ch'an or Zen Buddhism, usually one of the sayings of a great Zen master of the past. In the formative period of ...

martial arts

(Encyclopedia)martial arts, various forms of self-defense, usually weaponless, based on techniques developed in ancient China, India, and Tibet. In modern times they have come into wide use for self-protection, as ...

Banksy

(Encyclopedia)Banksy, pseud. of an English graffiti artist, c.1974–, probably b. Bristol. He painted on walls, bridges, and the like in Bristol and London in the 1990s before he began to use (c.2000) stencils and...

Ickes, Harold LeClaire

(Encyclopedia)Ickes, Harold LeClaire ĭkˈēz [key], 1874–1952, American statesman, b. Blair co., Pa. As a Chicago newspaper reporter and later as a lawyer, he became interested in local reform politics. Original...

Constantius III

(Encyclopedia)Constantius III, d. 421, Roman emperor of the West (421). In 411, as general of Honorius, he defeated Gerontius and Constantine; thereafter he was the virtual ruler of the West. Aspiring to the hand o...

Gorey, Edward

(Encyclopedia)Gorey, Edward, 1925–2000, American illustrator and writer, b. Chicago, grad. Harvard, 1950. He lived and worked in New York City and Cape Cod until 1986 when he moved permanently to the Cape. Gorey ...