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Tikhonov, Viktor Vasilyevich

(Encyclopedia)Tikhonov, Viktor Vasilyevich, 1930–2014, Soviet and Russian ice hockey player and coach, b. Moscow. As a defenseman (1949–63), he won four national championships (1951–54) with the Soviet air fo...

Riobamba

(Encyclopedia)Riobamba rēōbämˈbä [key], city (1990 est. pop. 95,505), capital of Chimborazo prov., central Ecuador, near Chimborazo volcano, in a high basin of the Andes. Riobamba is the headquarters of the ra...

Fairbanks

(Encyclopedia)Fairbanks, city (2020 pop. 32,515), Fairbanks North Star Borough, E central Alaska, on the Chena River near its confluence with the Tanana; inc. 1903. F...

Valkyries

(Encyclopedia)Valkyries vălkērˈēz [key], in Germanic mythology, warrior maidens of Odin. They presided over battles, chose those who were to die, and brought the souls of the dead heroes back to Valhalla. Chief...

Open University

(Encyclopedia)Open University, headquartered at Milton Keynes, England; founded 1969 as the Univ. of the Air. In 1971 a distance learning program was begun that now consists of correspondence courses integrated wit...

Oxnard

(Encyclopedia)Oxnard ŏkˈsnärd [key], city (1990 pop. 142,216), Ventura co., S Calif., on the Pacific coast; inc. 1903. Its economy, formerly based on agriculture, mining, and nearby military bases, has expanded ...

flotation process

(Encyclopedia)flotation process, in mineral treatment and mining, process for concentrating the metal-bearing mineral in an ore. Crude ore is ground to a fine powder and mixed with water, frothing reagents, and col...

Abubakar, Abdulsalam Alhaji

(Encyclopedia)Abubakar, Abdulsalam Alhaji, 1942–, Nigerian military officer and political leader, b. Minna, Niger State. He served in the Nigerian air force (1963–67) and army (1967–99), achieving the rank of...

streamline

(Encyclopedia)streamline, path of a fluid flowing steadily and without appreciable turbulence. A body is said to be streamlined if its shape offers the least possible resistance to a current of air, water, or other...

sleet

(Encyclopedia)sleet, precipitation of small, partially melted grains of ice. As raindrops fall from clouds, they pass through layers of air at different temperatures. If they pass through a layer with a temperature...