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turbulence

(Encyclopedia)turbulence, state of violent or agitated behavior in a fluid. Turbulent behavior is characteristic of systems of large numbers of particles, and its unpredictability and randomness has long thwarted a...

Thorne, Kip Stephen

(Encyclopedia)Thorne, Kip Stephen, 1940–, American theoretical physicist, b. Logan, Utah. Ph.D. Princeton, 1965. Thorne has been a professor (emeritus from 2009) at the California Institute of Technology since 19...

Three Mile Island

(Encyclopedia)Three Mile Island, site of a nuclear power plant 10 mi (16 km) south of Harrisburg, Pa. On Mar. 28, 1979, failure of the cooling system of the No. 2 nuclear reactor led to overheating and partial melt...

umbrella

(Encyclopedia)umbrella, a small canopy used as a protection against the sun in China, Egypt, and elsewhere in remote antiquity. It was often an emblem of rank. During the Middle Ages the umbrella became almost exti...

needlework

(Encyclopedia)needlework, work done with a needle, either plain sewing, mending, or ornamental work such as embroidery, quilting, smocking, hemstitching, fagoting, some kinds of lace making (see lace), patchwork, a...

Neel, Alice

(Encyclopedia)Neel, Alice, 1900–84, American painter, b. Merion Square, Pa., grad. Philadelphia School of Design for Women (1925). She worked (1933–43) for various Depression-era government arts programs, paint...

Voulkos, Peter

(Encyclopedia)Voulkos, Peter, 1924–2002, American ceramist and sculptor who helped establish ceramics as a fine art, b. Bozeman, Mont., B.S. Montana State College (now Montana State Univ.), 1951, M.F.A California...

Ward, John Quincy Adams

(Encyclopedia)Ward, John Quincy Adams, 1830–1910, American sculptor, b. Urbana, Ohio. He was trained under H. K. Brown, whom he assisted in the execution of the equestrian statue of George Washington in New York ...

spectroscope

(Encyclopedia)spectroscope, optical instrument for producing spectral lines and measuring their wavelengths and intensities, used in spectral analysis (see spectrum). When a material is heated to incandescence it e...

Stein, Clarence

(Encyclopedia)Stein, Clarence, 1882–1975, American architect, b. New York City, studied architecture at Columbia and the École des Beaux-Arts. Stein worked in the office of Bertram Grosvenor Goodhue, where he as...