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U.S. Highway 57 (US 57) is a 98-mile (158 km) north–south intrastate United States highway that follows a nearly east–west route in the southwestern part of the U.S. state of Texas. The highway's northern (eastern) terminus is about 50 miles (80 km) south of San Antonio, Texas , between Devine and Pearsall , at an intersection with ...
The Allan variance ( AVAR ), also known as two-sample variance, is a measure of frequency stability in clocks, oscillators and amplifiers. It is named after David W. Allan and expressed mathematically as . The Allan deviation ( ADEV ), also known as sigma-tau, is the square root of the Allan variance, .
Added to NRHP. September 6, 1991. Wharton Furnace is an historic iron furnace located at Wharton Township, Fayette County, Pennsylvania, United States. It was built in 1837, and is a stone structure measuring 33 feet (10 m) wide, 31 feet (9.4 m) deep, and 31 feet (9.4 m) high. It was built as a blast furnace, placed in blast in 1839 and went ...
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Ruud Knol (born 13 March 1981) is a Dutch professional football coach and former player. He most notably played as a centre-back for Vitesse between 2000 and 2007. Club career [ edit ]
The Martin B-57 Canberra is an American-built, twin-engined tactical bomber and reconnaissance aircraft that entered service with the United States Air Force (USAF) in 1953. The B-57 is a license-built version of the British English Electric Canberra, manufactured by the Glenn L. Martin Company. Initial Martin-built models were virtually ...
Climate change threatens people with increased flooding, extreme heat, increased food and water scarcity, more disease, and economic loss. Human migration and conflict can also be a result. [12] The World Health Organization (WHO) calls climate change the greatest threat to global health in the 21st century. [13]
The history of the Internet has its origin in the efforts of scientists and engineers to build and interconnect computer networks.The Internet Protocol Suite, the set of rules used to communicate between networks and devices on the Internet, arose from research and development in the United States and involved international collaboration, particularly with researchers in the United Kingdom and ...