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D'Alembert's principle

(Encyclopedia)D'Alembert's principle dălˈəmbârzˌ [key], in mechanics, principle permitting the reduction of a problem in dynamics to one in statics. This is accomplished by introducing a fictitious force equal...

Pedersen, Charles John

(Encyclopedia)Pedersen, Charles John, 1904–89, American chemist, b. Busan, Korea, M.S. Massachusetts Institute of Technology, 1927. After finishing his studies, Pedersen began work as a research chemist for the D...

Thomas, Albert

(Encyclopedia)Thomas, Albert älbĕrˈ tômäˈ [key], 1878–1932, French statesman and Socialist leader. He worked with Jean Jaurès on the journal Humanité and was active in socialist politics. In 1910 he was e...

Péronne

(Encyclopedia)Péronne pārônˈ [key], town (1993 est. pop. 9,200), Somme dept., N France, in Picardy, on the Somme River. It is a farm trade center, and its manufactures include wool, bricks, furniture, and plast...

Casadesus, Robert

(Encyclopedia)Casadesus, Robert käsädāsüsˈ [key], 1899–1972, French pianist and composer, b. Paris. Casadesus was born into a family remarkable for its numerous celebrated musicians. After study at the Paris...

Hesdin, Jacquemart de

(Encyclopedia)Hesdin, Jacquemart de zhäkmärˈ də ādăNˈ [key], fl. c.1384–1411, Franco-Flemish manuscript illuminator. Jacquemart illustrated numerous books of hours, including a number of manuscripts for Je...

Hurok, Sol

(Encyclopedia)Hurok, Sol hyo͝orˈŏk, yo͝orˈ– [key], 1888–1974, American impresario, b. Russia. Emigrating to the United States in 1906, Hurok was a peddler, streetcar conductor, bottlewasher, and hardware s...

Cram, Donald James

(Encyclopedia)Cram, Donald James, 1919–2001, American chemist, b. Chester, Vt., Ph.D. Harvard, 1947. A professor at the Univ. of California at Los Angeles, Cram expanded on the work of Charles J. Pedersen by synt...

Dacko, David

(Encyclopedia)Dacko, David dävēdˈ däkōˈ [key], 1930–2003, president of the Central African Republic (1960–66, 1979–81). A leader in the independence movement in French Equatorial Africa, he became the f...

essence

(Encyclopedia)essence, in philosophy, the nature of a thing. Aristotle maintained that there is a distinction between the form of a thing—its intelligible, verbally formulable character—and the essence of a thi...