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Radishchev, Aleksandr Nikolayevich

(Encyclopedia)Radishchev, Aleksandr Nikolayevich əlyĭksänˈdər nyĭkəlīˈəvĭch rədyēshˈchĭf [key], 1749–1802, Russian writer and liberal. Of a noble family, he studied in Leipzig and there came under ...

Raman effect

(Encyclopedia)Raman effect räˈmən [key], appearance of additional lines in the spectrum of monochromatic light that has been scattered by a transparent material medium. The effect was discovered by C. V. Raman i...

Pecos National Historical Park

(Encyclopedia)Pecos National Historical Park, 6,671 acres (2,702 hectares), N New Mexico; est. as a national monument 1965, designated a national historical park 1990. The park contains the remains of the Pecos pue...

Western Cape

(Encyclopedia)Western Cape, province (2011 pop. 5,822,734), 49,986 sq mi (129,462 sq km), SW South Africa, on the Atlantic and Indian oceans. In 1994, under South Africa's post-apartheid constitution, Western Cape ...

refining

(Encyclopedia)refining, any of various processes for separating impurities from crude or semifinished materials. It includes the finer processes of metallurgy, the fractional distillation of petroleum into its comm...

Taranto

(Encyclopedia)Taranto täˈräntō [key], Lat. Tarentum, city (1991 pop. 232,334), capital of Taranto prov., Apulia, S Italy, on the Gulf of Taranto, an arm of the Ionian Sea. Taranto is, after La Spezia, the chief...

Ürümqi

(Encyclopedia)Ürümqi or Urumchi both: o͞oro͞omˈchē [key], city (1994 est. pop. 1,130,300), capital of Xinjiang Uygur Autonomous Region, NW China, in the Dzungarian basin. Ürümqi is an administrative and com...

Samara, city, Russia

(Encyclopedia)Samara səmäˈrə [key], formerly Kuybyshev, city (1989 pop. 1,254,000), capital of its region, E central European Russia, on the left bank of the Volga and at the mouth of the Samara River. It is a ...

fuel

(Encyclopedia)fuel, material that can be burned or otherwise consumed to produce heat. The common fuels used in industry, transportation, and the home are burned in air. The carbon and hydrogen in fuel rapidly comb...

siege

(Encyclopedia)siege, assault against a city or fortress with the purpose of capturing it. The history of siegecraft parallels the development of fortification and, later, artillery. In early times battering rams an...