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Joffe, Abram

(Encyclopedia)Joffe, Abram əbrämˈ yôˈfyə [key], 1880–1960, Soviet scientist, b. Ukraine, grad. St. Petersburg Technological Institute, 1902. From 1902 to 1906 he worked in Munich as an assistant to W. C. Ro...

Economic Community of West African States

(Encyclopedia)Economic Community of West African States (ECOWAS), organization established in 1975 to increase economic cooperation and development in West Africa. Members include Benin, Burkina Faso, Cape Verde, C...

scalar

(Encyclopedia)scalar, quantity or number possessing only sign and magnitude, e.g., the real numbers (see number), in contrast to vectors and tensors; scalars obey the rules of elementary algebra. Many physical quan...

Abbot, Charles Greeley

(Encyclopedia)Abbot, Charles Greeley, 1872–1973, American astrophysicist, b. Wilton, N.H. He was acting director in 1896 and director in 1907 of the astrophysical observatory of the Smithsonian Institution; he wa...

Brahic, André Fernand

(Encyclopedia)Brahic, André Fernand, 1942–2016, French astrophysicist, b. Paris. He was introduced to astrophysics by Evry Schatzman, a leading French theoretician, and obtained his doctorate from the Univ. of P...

maser

(Encyclopedia)maser māˈzər [key], device for creation, amplification, and transmission of an intense, highly focused beam of high-frequency radio waves. The name maser is an acronym for microwave amplification b...

radioactivity

(Encyclopedia)CE5 Effects of a magnetic field on the products of radioactivity CE5 Disintegration series: Radioactive decay of radium-226 into lead-206 radioactivity, spontaneous disintegration or decay of t...

Area 51

(Encyclopedia)Area 51, name for a U.S. military site, S Nev., c.80 mi (130 km) NNW of Las Vegas. Shrouded in secrecy since the mid-20th cent., it is located within the U.S. Air Force's enormous Nevada Test and Trai...

Gaitskell, Hugh Todd Naylor

(Encyclopedia)Gaitskell, Hugh Todd Naylor gātˈskəl [key], 1906–63, British statesman. Educated at Oxford, he taught economics at the Univ. of London. During World War II he was a civil servant in the new minis...

Gambier Islands

(Encyclopedia)Gambier Islands gămˈbĭr [key], volcanic islands (6 sq mi/15.5 sq km), South Pacific, near the ...