QR
Encyclopedia
QR may stand for:
- Qatar AirwaysQatar AirwaysQatar Airways Company Q.C.S.C. , operating as Qatar Airways, is the flag carrier of Qatar. Headquartered in the Qatar Airways Tower in Doha, it operates a hub-and-spoke network, linking over 100 international destinations from its base in Doha, using a fleet of over 100 aircraft...
IATA code - Queensland RailQueensland RailQueensland Rail, also known as QR, is a government-owned railway operator in the state of Queensland. Under the control of the Queensland Government, Queensland Rail operates the inner-city and long-distance passenger services, as well as some freight operations and gives railway access to other...
, a company responsible for the railway system in Queensland, Australia - Queen's RegulationsQueen's RegulationsQueen's Regulations are a collection of orders and regulations in force in the Royal Navy, British Army, and Royal Air Force, forming guidance for officers of these armed services in all matters of discipline and personal conduct...
, a guidance on conduct in the UK's armed forces - QueensrÿcheQueensrÿchethumb|250px|right|Queensrÿche's classic line-up performing at the [[Sauna Open Air Metal Festival]] 2011 in [[Tampere]], [[Finland]]. Left to right: bass Eddie Jackson, lead vocals Geoff Tate, drums Scott Rockenfield and guitars Michael Wilton....
, a progressive metal band - Karakalpakstan (Qoraqalpog'iston Respublikasi), Uzbekistan, under ISO 3166-2 subcode UZ-QR
- Nippon Cultural BroadcastingNippon Cultural Broadcastingis a Japanese radio station in Tokyo which broadcasts to the Kanto area. It is one of the two flagship radio stations of National Radio Network and also has a relationship with JOLF and Fuji Television....
, a Tokyo radio station, from call sign JOQR - Quintana RooQuintana RooQuintana Roo officially Estado Libre y Soberano de Quintana Roo is one of the 31 states which, with the Federal District, comprise the 32 Federal Entities of Mexico. It is divided in 10 municipalities and its capital city is Chetumal....
, a state of Mexico - Quintana Roo (company)Quintana Roo (company)Quintana Roo is a company that produces products for triathlon, primarily bicycles and wetsuits. The company was founded in 1987 by Dan Empfield of Ironman fame and is owned by the American Bicycle Group, LLC...
, a triathlon-specific wetsuit and bicycle company - Quick release skewerQuick release skewerA quick release skewer is a mechanism for attaching a wheel to a bicycle. It consists of a rod threaded on one end and with a lever operated cam assembly on the other. The rod is inserted into the hollow axle of the wheel, a nut is threaded on, and the lever is closed to tighten the cam and secure...
, a device used to secure the wheels on a bicycle - Quiet RiotQuiet RiotQuiet Riot is an American Heavy Metal band. They are best known for their hit singles "Metal Health" and "Cum On Feel the Noize". They were founded in 1973 by guitarist Randy Rhoads and bassist Kelly Garni, under the original name Mach 1, before changing the name to Little Women and finally Quiet...
, a heavy metal band - Quarterly ReviewQuarterly ReviewThe Quarterly Review was a literary and political periodical founded in March 1809 by the well known London publishing house John Murray. It ceased publication in 1967.-Early years:...
, a defunct literary and political periodical - Queen's RadioQueen's RadioQueen's Radio is a student radio station, broadcasting a wide variety of , based at Queen's University, Belfast, Northern Ireland, currently broadcasting via Its studios are located in the Students' Union building...
, a student radio station at Queen's University Belfast - Queen's RangersQueen's RangersThe Queen's Rangers was a military unit who fought on the Loyalist side during the American War of Independence. After the war they moved to Nova Scotia and disbanded, but were reformed again in Upper Canada before disbanding again, in 1802, a decade prior to the War of 1812.-French and Indian...
, a military unit who fought in the American War of Independence - QR codeQR codeA QR code is a type of matrix barcode first designed for the automotive industry. More recently, the system has become popular outside of the industry due to its fast readability and comparatively large storage capacity. The code consists of black modules arranged in a square pattern on a white...
('Quick Response code'), a two-dimensional code - Nissan QR engineNissan QR engineThe QR family of straight-4 piston engines by Nissan were introduced in 2000 and range from 2.0 L to 2.5 L in displacement. These motors are aluminum, dual overhead camshaft , four-valve designs with variable valve timing and optional direct injection.-QR20DE:The 2.0 L QR20DE...
- ATCvet code QR Respiratory system, a section of the Anatomical Therapeutic Chemical Classification System for veterinary medicinal products
- In mathematics:
- QR decompositionQR decompositionIn linear algebra, a QR decomposition of a matrix is a decomposition of a matrix A into a product A=QR of an orthogonal matrix Q and an upper triangular matrix R...
, a decomposition of a matrix - QR algorithmQR algorithmIn numerical linear algebra, the QR algorithm is an eigenvalue algorithm: that is, a procedure to calculate the eigenvalues and eigenvectors of a matrix. The QR transformation was developed in the late 1950s by John G.F. Francis and by Vera N. Kublanovskaya , working independently...
, an eigenvalue algorithm using QR decomposition - Quadratic reciprocityQuadratic reciprocityIn number theory, the law of quadratic reciprocity is a theorem about modular arithmetic which gives conditions for the solvability of quadratic equations modulo prime numbers...
, a theorem from modular arithmetic - QuasireversibilityQuasireversibilityIn probability theory, specifically queueing theory, quasireversibility is a property of some queues. The concept was first identified by Richard R. Muntz and further developed by Frank Kelly. Quasireversibility differs from reversibility in that a stronger condition is imposed on arrival rates...
, a property of some queues
- QR decomposition