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ray, in physics

(Encyclopedia)ray, in physics, term denoting the straight line along which light or other form of radiation is propagated from its source. It generally refers to the line of propagation of waves but is also applied...

Cherenkov, Pavel Alekseyevich

(Encyclopedia)Cherenkov, Pavel Alekseyevich päˈvĭl əlyĭksyāˈyəvĭch chərĕngˈkəf [key], 1904–90, Soviet physicist. He shared with the Soviet physicists I. M. Frank and I. Y. Tamm the 1958 Nobel Prize i...

space medicine

(Encyclopedia)space medicine, study of the medical and biological effects of space travel on living organisms. The principal aim is to discover how well and for how long humans can withstand the extreme conditions ...

Rotterdam, city, Netherlands

(Encyclopedia)Rotterdam rŏtˈərdămˌ, Dutch rôtərdämˈ [key], city (1994 pop. 598,521), South Holland prov., W Netherlands, on the Nieuwe Maas (New Meuse) River near its mouth on the North Sea. One of the lar...

Lyon, Matthew

(Encyclopedia)Lyon, Matthew, 1750–1822, American political leader and pioneer, b. Co. Wicklow, Ireland. He emigrated to America in 1765, settling eventually in Vermont. During the American Revolution he served wi...

Rickover, Hyman George

(Encyclopedia)Rickover, Hyman George, 1900–1986, American admiral, b. Russia. In World War II he served as head of the electrical section of the navy's Bureau of Ships. After the war he was assigned (1946) to the...

colorization, motion picture

(Encyclopedia)colorization, motion picture, electronic process that uses computers to add color to black-and-white movies, creating new colored videotape versions. Invented by Canadians Wilson Markle and Brian Hunt...

Brooks, Gwendolyn Elizabeth

(Encyclopedia)Brooks, Gwendolyn Elizabeth, 1917–2000, American poet, b. Topeka, Kans. She grew up in the slums of Chicago and lived in that city until her death. Brooks's poems, technically accomplished and writt...

Cohen-Tannoudji, Claude Nessim

(Encyclopedia)Cohen-Tannoudji, Claude Nessim, 1933–, French physicist, b. Algeria, Ph.D. École Normale Supérieure, Paris, 1962. He has continued his research at the École Normale Supérieure, and was a profess...

agranulocytosis

(Encyclopedia)agranulocytosis əgrănˌyəlōsītōˈsis [key], disease in which the production of granulated white blood cells by the bone marrow is impaired. Although the disease may occur spontaneously it is usu...