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Rotor
Rotor may refer to: Science and technology Engineering *Rotor (electric), the non-stationary part of an alternator or electric motor, operating with a stationary element so called the stator *ROTOR, a former radar project in the UK following the Second World War *Rotor Componentes Tecnológicos, is a Spanish manufacturer of high-end bicycle components with headquarters in Ajalvir, Spain. *Rotor (antenna) *In mechanical engineering, the rotor is a part of a machine that rotates about its own Axis of rotation, axis. **Helicopter rotor, the rotary wing(s) of a rotorcraft such as a helicopter **Rotor (turbine), the rotor of a turbine powered by fluid pressure **Rotor (crank), a variable-angle bicycle crank **Rotor (brake), the disc of a disc brake, in U.S. terminology **Detangler, Rotor (brake mechanism), a device that allows the handlebars and fork to revolve indefinitely without tangling the rear brake cable - see Detangler **Rotor (distributor), a component of the ignition system of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ROTOR
ROTOR was an elaborate air defence radar system built by the British Government in the early 1950s to counter possible attack by Soviet bombers. To get it operational as quickly as possible, it was initially made up primarily of WWII-era systems, notably the original Chain Home radars for the early warning role, and the AMES Type 7 for plotting and interception control. Data from these stations was sent to a network of control stations, mostly built underground, using an extensive telephone and telex network. A similar expedient system in the United States was the Lashup Radar Network. ROTOR called for the continual upgrading of the network over time, both the radars and the command and control systems. Among these upgrades was a new microwave frequency radar to replace Chain Home . An experimental system, Green Garlic, was so successful that it began replacing Chain Home starting in 1954. In service, these proved so accurate that they could replace the Type 7 radars as well ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rotor (electric)
The rotor is a moving component of an electromagnetic system in the electric motor, electric generator, or alternator. Its rotation is due to the interaction between the windings and magnetic fields which produces a torque around the rotor's axis.Staff. "Understanding Alternators. What Is an Alternator and How Does It Work." N.p., n.d. Web. 24 November 2014 . Early development An early example of electromagnetic rotation was the first rotary machine built by Ányos Jedlik with electromagnets and a commutator, in 1826-27. Other pioneers in the field of electricity include Hippolyte Pixii who built an alternating current generator in 1832, and William Ritchie's construction of an electromagnetic generator with four rotor coils, a commutator and brushes, also in 1832. Development quickly included more useful applications such as Moritz Hermann Jacobi's motor that could lift 10 to 12 pounds with a speed of one foot per second, about 15 watts of mechanical power in 1834. In 18 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rotor Machine
In cryptography, a rotor machine is an electro-mechanical stream cipher device used for encrypting and decrypting messages. Rotor machines were the cryptographic state-of-the-art for much of the 20th century; they were in widespread use from the 1920s to the 1970s. The most famous example is the German Enigma machine, the output of which was deciphered by the Allies during World War II, producing intelligence code-named '' Ultra''. Description The primary component of a rotor machine is a set of ''rotors'', also termed ''wheels'' or ''drums'', which are rotating disks with an array of electrical contacts on either side. The wiring between the contacts implements a fixed substitution of letters, replacing them in some complex fashion. On its own, this would offer little security; however, before or after encrypting each letter, the rotors advance positions, changing the substitution. By this means, a rotor machine produces a complex polyalphabetic substitution cipher, whic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rotor (meteorology)
In meteorology, lee waves are atmospheric stationary waves. The most common form is mountain waves, which are atmospheric internal gravity waves. These were discovered in 1933 by two German glider pilots, Hans Deutschmann and Wolf Hirth, above the Giant Mountains. They are periodic changes of atmospheric pressure, temperature and orthometric height in a current of air caused by vertical displacement, for example orographic lift when the wind blows over a mountain or mountain range. They can also be caused by the surface wind blowing over an escarpment or plateau, or even by upper winds deflected over a thermal updraft or cloud street. The vertical motion forces periodic changes in speed and direction of the air within this air current. They always occur in groups on the lee side of the terrain that triggers them. Sometimes, mountain waves can help to enhance precipitation amounts downwind of mountain ranges. Usually a turbulent vortex, with its axis of rotation parallel to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rotor (ride)
The Rotor is an amusement ride designed and patented by German engineer Ernst Hoffmeister in 1948. The ride was first demonstrated at Oktoberfest 1949 and still appears in numerous amusement parks. The Rotor is a large, upright barrel, rotated to create an inward acting centripetal force supplied by the wall's support's force. Once at full speed, the floor is retracted, leaving the riders stuck to the wall of the drum. History The Rotor amusement ride was designed and patented by German engineer Ernst Hoffmeister in 1948. It was first demonstrated at Oktoberfest 1949, and was exhibited at fairs and events throughout Europe, during the 1950s and 1960s. The ride still appears in select amusement parks in Europe, although travelling variants have been surpassed by the Gravitron. Design and operation The Rotor is a large, upright barrel, rotated at 33 revolutions per minute. The rotation of the barrel creates an inward acting centripetal force supplied by the wall's supp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rotor (Sonic The Hedgehog)
''Sonic the Hedgehog'' was an American comic book series published by Archie Comics and Sega of America, based on the Sonic video game franchise, and especially the 1993 ''Sonic'' saturday morning cartoon. After debuting with a four-issue miniseries cover dated February to May 1993, the first full-length issue was published in July 1993 and ran until December 2016. The series follows the Freedom Fighters, an organization of heroes led by Sonic and Sally Acorn in their battles against Doctor Eggman and other villains. While largely consisting of its own continuity, certain issues incorporated elements of the ''Sonic'' video games into their plots and settings. Over its history, the series had several spin-off series set in the same continuity, including ''Knuckles the Echidna'', ''Sonic Universe'', and two crossovers with Archie's ''Mega Man'' series. Alongside the series, Archie also produced comics series based on the ''Sonic X'' and ''Sonic Boom'' TV series. Following a 2 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SC Rotor Volgograd
SC Rotor Volgograd () is a Russian professional football club from the large city of Volgograd, Volgograd Oblast (formerly Stalingrad). The club plays in the second-tier Russian First League, and are the largest and best supported Volgograd club. For most of their existence, they have been the city's only representatives in the national league system. They played at the top level of Soviet/Russian football either side of World War II, from 1989 to 1990, from 1991 to 2004 and in the 2020–21 season. During the 1990s, they were one of the strongest clubs in newly independent Russia and qualified for European competition four times. In recent years, financial and ownership difficulties have repeatedly threatened their professional status and they have played mostly in lower regional leagues. The team currently plays its home games at the Volgograd Arena since 2018. History Both the current team name and the former name "Traktor" are references to the Stalingrad Tractor Factory, on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Curl (mathematics)
In vector calculus, the curl, also known as rotor, is a vector operator that describes the Differential (infinitesimal), infinitesimal Circulation (physics), circulation of a vector field in three-dimensional Euclidean space. The curl at a point in the field is represented by a vector (geometry), vector whose length and direction denote the Magnitude (mathematics), magnitude and axis of the maximum circulation. The curl of a field is formally defined as the circulation density at each point of the field. A vector field whose curl is zero is called irrotational. The curl is a form of derivative, differentiation for vector fields. The corresponding form of the fundamental theorem of calculus is Kelvin–Stokes theorem, Stokes' theorem, which relates the surface integral of the curl of a vector field to the line integral of the vector field around the boundary curve. The notation is more common in North America. In the rest of the world, particularly in 20th century scientific li ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rotor (mathematics)
A rotor is an object in the geometric algebra (also called Clifford algebra) of a vector space that represents a rotation about the origin. The term originated with William Kingdon Clifford, in showing that the quaternion algebra is just a special case of Hermann Grassmann's "theory of extension" (Ausdehnungslehre). Hestenes Hestenes uses the notation R^\dagger for the reverse. defined a rotor to be any element R of a geometric algebra that can be written as the product of an even number of unit vectors and satisfies R\tilde R = 1, where \tilde R is the "reverse" of R—that is, the product of the same vectors, but in reverse order. Definition In mathematics, a rotor in the geometric algebra of a vector space ''V'' is the same thing as an element of the spin group Spin(''V''). We define this group below. Let ''V'' be a vector space equipped with a positive definite quadratic form ''q'', and let Cl(''V'') be the geometric algebra associated to ''V''. The algebra Cl(''V'') i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rotor Syndrome
Rotor syndrome (also known as Rotor type hyperbilirubinemia) is a rare cause of mixed direct (conjugated) and indirect (unconjugated) hyperbilirubinemia, relatively benign, autosomal recessive bilirubin disorder characterized by non-hemolytic jaundice due to the chronic elevation of predominantly conjugated bilirubin. Rotor type hyperbilirubinemia is a distinct yet similar disorder to Dubin–Johnson syndrome – both diseases cause an increase in conjugated bilirubin, but Rotor syndrome differs in that it is a result of impaired hepatocellular storage of conjugated bilirubin that leaks into plasma causing hyperbilirubinemia. Signs and symptoms Rotor syndrome has many features in common with Dubin–Johnson syndrome, an exception being that the liver cells are not pigmented. The main symptom is a non-itching jaundice. There is a rise in bilirubin in the patient's serum, mainly of the conjugated type. It can be differentiated from Dubin–Johnson syndrome in the following ways: ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rigid Rotor
In rotordynamics, the rigid rotor is a mechanical model of rotating systems. An arbitrary rigid rotor is a 3-dimensional rigid object, such as a top. To orient such an object in space requires three angles, known as Euler angles. A special rigid rotor is the ''linear rotor'' requiring only two angles to describe, for example of a diatomic molecule. More general molecules are 3-dimensional, such as water (asymmetric rotor), ammonia (symmetric rotor), or methane (spherical rotor). Linear rotor The linear rigid rotor model consists of two point masses located at fixed distances from their center of mass. The fixed distance between the two masses and the values of the masses are the only characteristics of the rigid model. However, for many actual diatomics this model is too restrictive since distances are usually not completely fixed. Corrections on the rigid model can be made to compensate for small variations in the distance. Even in such a case the rigid rotor model is a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
