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Cedar Rapids

(Encyclopedia)Cedar Rapids, city (2020 pop. 137,710), seat of Linn co., E central Iowa, on the Cedar River; inc. as a city 1856. The second largest city in Iowa, it i...

mining

(Encyclopedia)mining, extraction of solid mineral resources from the earth. These resources include ores, which contain commercially valuable amounts of metals, such as iron and aluminum; precious stones, such as d...

Mazandaran

(Encyclopedia)Mazandaran dĕränˈ [key], province (1991 pop. 3,793,149), c.20,400 sq mi (52,840 sq km), N Iran, bordering the Caspian Sea in the north. Sari is the capital; other cities include Babol, Amul, and Go...

digital-to-analog conversion

(Encyclopedia)digital-to-analog or D/A conversion, the process of changing discrete digital data into a continuously varying signal in relation to a standard or reference. There are two types of converters: electro...

Tanintharyi

(Encyclopedia)Tanintharyi tĕnăsˈərĭm [key], region (1983 pop. 917,628), 21,297 sq mi (55,159 sq km), extreme S Myanmar. Dawei (Tavoy), the capital, and Myeik (Mergui) are the chief towns. A narrow strip of coa...

spring, in mechanics

(Encyclopedia)spring, in mechanics, any of several elastic devices used variously to store and to furnish energy, to absorb shock, to sustain the pressure between contacting surfaces, and to resist tensional or com...

bolometer

(Encyclopedia)bolometer bōlŏmˈətər, bə– [key], instrument for detecting and measuring radiation, e.g., visible light, infrared radiation, and ultraviolet radiation, in amounts as small as one millionth of a...

thermite

(Encyclopedia)thermite [from Thermit, a trade name], mixture of powdered or granular aluminum metal and powdered iron oxide. When ignited it gives off large amounts of heat. In wartime it has been used in incendiar...

Sierra Club

(Encyclopedia)Sierra Club, national organization in the United States dedicated to the preservation and expansion of the world's parks, wildlife, and wilderness areas. Founded (1892) in California by a group led by...

Derbent

(Encyclopedia)Derbent dyĭrbyĕntˈ [key], city, SE European Russia, in Dagestan, on the Caspian Sea. It st...