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Scramjet Operation En
A scramjet (supersonic combustion ramjet) is a variant of a ramjet airbreathing jet engine in which combustion takes place in supersonic airflow. As in ramjets, a scramjet relies on high vehicle speed to compress the incoming air forcefully before combustion (hence ''ram''jet), but whereas a ramjet decelerates the air to subsonic velocities before combustion using shock cones, a scramjet has no shock cone and slows the airflow using shockwaves produced by its ignition source in place of a shock cone. This allows the scramjet to operate efficiently at extremely high speeds. History Before 2000 The Bell X-1 attained supersonic flight in 1947 and, by the early 1960s, rapid progress toward faster aircraft suggested that operational aircraft would be flying at "hypersonic" speeds within a few years. Except for specialized rocket research vehicles like the North American X-15 and other rocket-powered spacecraft, aircraft top speeds have remained level, generally in the range of M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
S-200 (missile)
The NPO Almaz S 200 ''Angara/Vega/Dubna'' ( Russian С-200 Ангара/Вега/Дубна), NATO reporting name SA-5 '' Gammon'' (initially ''Tallinn''), is a long range, high altitude surface-to-air missile (SAM) system developed by the Soviet Union in the 1960s to defend large areas from high-altitude bombers or other targets. In Soviet service, these systems were deployed primarily on the battalion level, with six launchers and a fire control radar. The S-200 can be linked to other, longer-range radar systems. Description The S-200 surface-to-air missile system was designed for the defense of the most important administrative, industrial and military installations from all types of air attack. The S-200 is an all-weather system that can be operated in various climatic conditions. By 1966, the S-200 was officially accepted into service in order to replace the failed anti-ballistic missile RZ-25/5V11 "Dal". The Dal was assigned the NATO reporting name SA-5 "Griffon" ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reed Business Information
RELX plc (pronounced "Rel-ex") is a British Multinational corporation, multinational information and analytics company headquartered in London, England. Its businesses provide scientific, technical and medical information and analytics; legal information and analytics; decision-making tools; and organise exhibitions. It operates in 40 countries and serves customers in over 180 nations. It was previously known as Reed Elsevier, and came into being in 1993 as a result of the merger of Reed International, a British trade book and magazine publisher, and Elsevier, a Netherlands-based scientific publisher. The company is publicly listed, with shares traded on the London Stock Exchange, Amsterdam Stock Exchange and New York Stock Exchange (ticker symbols: London: REL, Amsterdam: REN, New York: RELX). The company is one of the constituents of the FTSE 100 Index, Financial Times Global 500 and Euronext 100 Index. History The company, which was previously known as Reed Elsevier, came in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New Scientist
''New Scientist'' is a magazine covering all aspects of science and technology. Based in London, it publishes weekly English-language editions in the United Kingdom, the United States and Australia. An editorially separate organisation publishes a monthly Dutch-language edition. First published on 22 November 1956, ''New Scientist'' has been available in online form since 1996. Sold in retail outlets (paper edition) and on subscription (paper and/or online), the magazine covers news, features, reviews and commentary on science, technology and their implications. ''New Scientist'' also publishes speculative articles, ranging from the technical to the philosophical. ''New Scientist'' was acquired by Daily Mail and General Trust (DMGT) in March 2021. History Ownership The magazine was founded in 1956 by Tom Margerison, Max Raison and Nicholas Harrison as ''The New Scientist'', with Issue 1 on 22 November 1956, priced at one shilling (a twentieth of a pound in pre-decimal UK ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DARPA
The Defense Advanced Research Projects Agency (DARPA) is a research and development agency of the United States Department of Defense responsible for the development of emerging technologies for use by the military. Originally known as the Advanced Research Projects Agency (ARPA), the agency was created on February 7, 1958, by President Dwight D. Eisenhower in response to the Soviet launching of Sputnik 1 in 1957. By collaborating with academia, industry, and government partners, DARPA formulates and executes research and development projects to expand the frontiers of technology and science, often beyond immediate U.S. military requirements.Dwight D. Eisenhower and Science & Technology, (2008). Dwight D. Eisenhower Memorial CommissionSource '' The Economist'' has called DARPA the agency "that shaped the modern world," and pointed out that " Moderna's COVID-19 vaccine sits alongside weather satellites, GPS, drones, stealth technology, voice interfaces, the personal comput ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Capua
Capua ( , ) is a city and ''comune'' in the province of Caserta, in the region of Campania, southern Italy, situated north of Naples, on the northeastern edge of the Campanian plain. History Ancient era The name of Capua comes from the Etruscan language, Etruscan ''Capeva''. The meaning is 'City of Marshes'. Its foundation is attributed by Cato the Elder to the Etruscan civilization, Etruscans, and the date given as about 260 years before it was "taken" by Rome. If this is true it refers not to its capture in the Second Punic War (211 BC) but to its submission to Rome in 338 BC, placing the date of foundation at about 600 BC, while Etruscan power was at its highest. In the area several settlements of the Villanovian civilization were present in prehistoric times, and these were probably enlarged by the Oscans and subsequently by the Etruscans. Etruscan supremacy in Campania came to an end with the Samnium, Samnite invasion in the latter half of the 5th century BC. About 424 B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NASA X-43
The NASA X-43 was an experimental unmanned hypersonic aircraft with multiple planned scale variations meant to test various aspects of hypersonic flight. It was part of the X-plane series and specifically of NASA's Hyper-X program. It set several airspeed records for jet aircraft. The X-43 is the fastest jet-powered aircraft on record at approximately Mach 9.6.Thompson, Elvia, Keith Henry and Leslie Williams"Faster Than a Speeding Bullet: Guinness Recognizes NASA Scramjet."''NASA.'' Retrieved: August 1, 2011. A winged booster rocket with the X-43 placed on top, called a "stack", was drop launched from a Boeing B-52 Stratofortress. After the booster rocket (a modified first stage of the Pegasus rocket) brought the stack to the target speed and altitude, it was discarded, and the X-43 flew free using its own engine, a scramjet. The first plane in the series, the X-43A, was a single-use vehicle, of which three were built. The first X-43A was destroyed after malfunctioning in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cassell Illustrated
Cassell & Co is a British book publishing house, founded in 1848 by John Cassell (1817–1865), which became in the 1890s an international publishing group company. In 1995, Cassell & Co acquired Pinter Publishers. In December 1998, Cassell & Co was bought by the Orion Publishing Group. In January 2002, Cassell imprints, including the Cassell Reference and Cassell Military were joined with the Weidenfeld imprints to form a new division under the name of Weidenfeld & Nicolson Ltd. Cassell Illustrated survives as an imprint of the Octopus Publishing Group. History John Cassell (1817–1865), who was in turn a carpenter, temperance preacher, tea and coffee merchant, finally turned to publishing. His first publication was on 1 July 1848, a weekly newspaper called ''The Standard of Freedom'' advocating religious, political, and commercial freedom. ''The Working Man's Friend'' became another popular publication. In 1849 Cassell was dividing his time between his publishing and his gr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HyShot
HyShot is a research project of The University of Queensland, Australiabr>Centre for Hypersonics to demonstrate the possibility of supersonic combustion under flight conditions using two scramjet engines, one designed by The University of Queensland and one designed by QinetiQ (formerly the MOD's Defence Evaluation & Research Agency).Michael K. Smart, Neal E. Hass, and Allan Paull. "Flight Data Analysis of the HyShot 2 Scramjet Flight Experiment", AIAA Journal, Vol. 44, No. 10 (2006), pp. 2366-2375. Overview The project has involved the successful launch of one engine designed by The University of Queensland, and one launch of the scramjet designed by the British company QinetiQ. Each combustion unit was launched on the nose of a Terrier- Orion Mk70 sounding rocket on a high ballistic trajectory, reaching altitudes of approximately 330 km. The rocket was rotated to face the ground, and the combustion unit ignited for a period of 6–10 seconds while falling between 35&n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
