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digital-to-analog conversion

(Encyclopedia)digital-to-analog or D/A conversion, the process of changing discrete digital data into a continuously varying signal in relation to a standard or reference. There are two types of converters: electro...

Dana, Richard Henry

(Encyclopedia)Dana, Richard Henry, 1787–1879, American poet and essayist, b. Cambridge, Mass.; son of Francis Dana. After studying law, he was admitted to the bar in 1811. Critic and poet, Dana was a founder and ...

clarinet

(Encyclopedia)clarinet, musical wind instrument of cylindrical bore employing a single reed. The clarinet family comprises all single-reed instruments, including the saxophone. The predecessor of the modern clarine...

Hopper, Grace

(Encyclopedia)Hopper, Grace, 1906–92, American computer scientist, b. New York City as Grace Brewster Murray. She was educated at Vassar College and Yale (Ph.D., 1934). After teaching at Vassar (1931–1943), she...

Jack Russell terrier

(Encyclopedia)Jack Russell terrier, breed of dog developed in the 19th cent. by an English clergyman, the Rev. John (Parson Jack) Russell, 1795–1883, for hunting. The Jack Russell resembles the fox terrier and, l...

Matthew of Paris

(Encyclopedia)Matthew of Paris or Matthew Paris, d. 1259, English historian, a monk of St. Albans. He became the historiographer of the convent after the death (c.1236) of Roger of Wendover. The first part of his C...

mood

(Encyclopedia)mood or mode, in verb inflection, the forms of a verb that indicate its manner of doing or being. In English the forms are called indicative (for direct statement or question or to express an uncertai...

Moore, John Bassett

(Encyclopedia)Moore, John Bassett, 1860–1947, American authority on international law, b. Smyrna, Del. He was admitted to the Delaware bar in 1883. He was (1885–86) a law clerk in the Dept. of State and was (18...

Arias, Arnulfo

(Encyclopedia)Arias, Arnulfo ärno͞olˈfō ärˈyäs [key], 1901–88, president of Panama (1940–41, 1949–51, Oct., 1968). A Harvard-trained physician, he led the coup that deposed President Florencio Harmodio...

Knuth, Donald Ervin

(Encyclopedia)Knuth, Donald Ervin no͞oth, kəno͞othˈ [key], 1938–, American mathematician and computer scientist, b. Milwaukee, Wis., grad. Case Institute of Technology (B.S. and M.S., 1960) and California Ins...