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resistance, in electricity

(Encyclopedia)resistance, property of an electric conductor by which it opposes a flow of electricity and dissipates electrical energy away from the circuit, usually as heat. Optimum resistance is provided by a con...

Schwartz, Melvin

(Encyclopedia)Schwartz, Melvin, 1932–2006 American physicist, b. New York City, Ph.D. Columbia, 1958. He was on the faculty at Columbia (1958–66, 1991–2000, emeritus 2000–2006) and Stanford (1966–83). Sch...

Ursins, Marie Anne de la Trémoille, princesse des

(Encyclopedia)Ursins, Marie Anne de la Trémoille, princesse des märēˈ än də lä trāmwäˈyə prăNsĕsˈ dāzürsănˈ [key], 1642–1722, French noblewoman and unofficial diplomat. After the death of her fi...

Aco, Michel

(Encyclopedia)Aco or Accault, Michel both: mēshĕlˈ äkōˈ [key], fl. 1680–1702, French explorer. He became La Salle's lieutenant, being favored by that explorer because of his courage, prudence, and wide acqu...

Douglas, Donald Wills

(Encyclopedia)Douglas, Donald Wills, 1892–1981, aviation pioneer and aerospace executive, b. Brooklyn, N.Y., B.S. Massachusetts Institute of Technology, 1914. He helped design the first wind tunnel (1914–15) an...

echo, in acoustics

(Encyclopedia)echo, reflection of a sound wave back to its source in sufficient strength and with a sufficient time lag to be separately distinguished. If a sound wave returns within 1⁄10 sec, the human ear is in...

Emmanuel Philibert

(Encyclopedia)Emmanuel Philibert āmänˈwĕl fēlēbĕrˈ [key], 1528–80, duke of Savoy (1553–80), called Ironhead. He succeeded his father, Charles III, who had been dispossessed of his duchy by Francis I of ...

Aravena, Alejandro

(Encyclopedia)Aravena, Alejandro 1967–, Chilean architect, b. Santiago, grad. Pontifical Catholic Univ. of Chile, Santiago (1992). Inspired by public service as much as by aesthetic concerns, he has focused on in...

Young, Thomas

(Encyclopedia)Young, Thomas, 1773–1829, English physicist, physician, and Egyptologist. He established (1799) a medical practice in London and was elected (1811) to the staff of St. George's Hospital there. His l...

Von Neumann, John

(Encyclopedia)Von Neumann, John noiˈmän [key], 1903–57, American mathematician, b. Hungary, Ph.D. Univ. of Budapest, 1926. He came to the United States in 1930 and was naturalized in 1937. He taught (1930–33)...