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fiber optics

(Encyclopedia)fiber optics, transmission of digitized messages or information by light pulses along hair-thin glass or plastic fibers. Each fiber is surrounded by a cladding having a high index of refractance so th...

Novaya Zemlya

(Encyclopedia)Novaya Zemlya nôˌvīə zĭmlyäˈ [key] [Rus.,=New Land], archipelago, c.35,000 sq mi (90,650 sq km), in the Arctic Ocean between the Barents and Kara seas, NW Russia. It consists of two main island...

Manche

(Encyclopedia)Manche mäNsh [key], department (1990 pop. 480,900), NW France, in Normandy, on the English Channel. Manche is coextensive with the Cotentin peninsula and extends S into the Norman woods. Saint-Lô (t...

San Luis Potosí, state, Mexico

(Encyclopedia)San Luis Potosí sän lo͞oēsˈ pōtōsēˈ [key], state (1990 pop. 2,003,187), 24,417 sq mi (63,240 sq km), central Mexico. San Luis Potosí is the capital. Most of the state lies on the eastern tab...

Butlerov, Aleksandr Mikhailovich

(Encyclopedia)Butlerov, Aleksandr Mikhailovich əlyĭksänˈdər mēkhīlˈəvĭch bo͞otˈlyərôf [key], 1825–86, Russian chemist. As professor at the Univ. of Kazan he founded the first school of Russian chemi...

physical chemistry

(Encyclopedia)physical chemistry, branch of science that combines the principles and methods of physics and chemistry. It provides a fundamental theoretical and experimental basis for all of chemistry, including or...

stereochemistry

(Encyclopedia)stereochemistry, study of the three-dimensional configuration of the atoms that make up a molecule and the ways in which this arrangement affects the physical and chemical properties of the molecule. ...

Marinduque

(Encyclopedia)Marinduque märēndo͞oˈkā [key], province (1990 pop. 185,524), the Philippines, between Mindoro and S Luzon. It includes Marinduque Island and 24 other islands. Iron, gold, silver, and copper are m...

Luanshya

(Encyclopedia)Luanshya lwänshˈyä [key], city (1990 pop. 146,275), N central Zambia, near the Congo border. It is a copper-mining center, located on the Copperbelt. ...

Tokat

(Encyclopedia)Tokat tōkätˈ [key], city (1990 pop. 83,174), capital of Tokat prov., N central Turkey. It is an agricultural market with copper manufactures. An important town in Roman times, it declined under the...