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LNER Class L2
L2, L2, L02, L II, L.2 or L-2 may refer to: Astronomy * L2 point, second Lagrangian point in a two body orbiting system * L2 Puppis, star which is also known as HD 56096 * Advanced Telescope for High Energy Astrophysics, a proposed X-ray telescope Biology * Haplogroup L2 (mtDNA) in human genetics * ATC code L02 ''Endocrine therapy'', a subgroup of the Anatomical Therapeutic Chemical Classification System * the second lumbar vertebrae of the vertebral column in human anatomy * the second larval stage in the ''Caenorhabditis elegans'' worm development Computing * L2 cache, the Level-2 CPU cache in a computer * Layer 2 of the OSI model, in computer networking * L2 (operating system), or Liedtke 2 (a.k.a. EUMEL/ELAN), a persistent microkernel operating system developed by German computer scientist Jochen Liedtke * L2 (programming language) * ISO/IEC 8859-2 (Latin-2), an 8-bit character encoding Entertainment * L2 (music group), an American pop duo * '' L2: Empuraan'', a 2025 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
L2 Point
In celestial mechanics, the Lagrange points (; also Lagrangian points or libration points) are points of equilibrium for small-mass objects under the gravitational influence of two massive orbiting bodies. Mathematically, this involves the solution of the restricted three-body problem. Normally, the two massive bodies exert an unbalanced gravitational force at a point, altering the orbit of whatever is at that point. At the Lagrange points, the gravitational forces of the two large bodies and the centrifugal force balance each other. This can make Lagrange points an excellent location for satellites, as orbit corrections, and hence fuel requirements, needed to maintain the desired orbit are kept at a minimum. For any combination of two orbital bodies, there are five Lagrange points, L1 to L5, all in the orbital plane of the two large bodies. There are five Lagrange points for the Sun–Earth system, and five ''different'' Lagrange points for the Earth–Moon system. L1, L ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lumines II
is a 2006 puzzle video game developed by Q Entertainment for the PlayStation Portable (PSP). It was released in November 2006 in the PAL region and North America by Buena Vista Games, and in February 2007 in Japan by Bandai Namco Games. The objective of the game is to move and rotate 2×2 blocks to form colored squares of the same color. Points are awarded to the player when the Time Line erases the colored squares. It serves as a direct sequel to '' Lumines: Puzzle Fusion'', expanding on previous modes from its predecessor and adding new modes such as Mission mode, Skin Edit mode, and Sequencer. ''Lumines II'' utilizes songs from its predecessor and introduces music videos as background skins from Japanese music artists and mainstream American music artists such as New Order, Missy Elliot, and Beck. When developing the game, game producer Tetsuya Mizuguchi intended to make the game have a different atmosphere than its predecessor and wanted to include more songs. Mizuguchi fu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
GPS Signals
GPS signals are broadcast by Global Positioning System satellites to enable satellite navigation. Using these signals, receivers on or near the Earth's surface can determine their Position, Velocity and Time (PVT). The GPS satellite constellation is operated by the 2nd Space Operations Squadron (2SOPS) of Space Delta 8, United States Space Force. GPS signals include ranging signals, which are used to measure the distance to the satellite, and navigation messages. The navigation messages include ephemeris data which are used both in trilateration to calculate the position of each satellite in orbit and also to provide information about the time and status of the entire satellite constellation, called the almanac. There are four GPS signal specifications designed for civilian use. In order of date of introduction, these are: L1 C/A, L2C, L5 and L1C. L1 C/A is also called the ''legacy signal'' and is broadcast by all currently operational satellites. L2C, L5 and L1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sterling Submachine Gun
The Sterling submachine gun is a British submachine gun (SMG). It was tested by the British Army in 1944–1945, but did not start to replace the Sten until 1953. A successful and reliable design, it remained standard issue in the British Army until 1994, when it began to be replaced by the L85A1, a bullpup assault rifle. History In 1944, the British General Staff issued a specification for a new submachine gun to replace the Sten. It stated that the new weapon should weigh no more than six pounds (2.7 kg), should fire 9×19mm Parabellum ammunition, have a rate of fire of no more than 500 rounds per minute, and be sufficiently accurate to allow five consecutive shots (fired in semi-automatic mode) to be placed inside a one-foot-square (30 cm × 30 cm) target at a distance of . To meet the new requirement, George William Patchett, the chief designer at the Sterling Armaments Company of Dagenham, submitted a sample weapon of new design in early 1944. The fi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
L109
The HG 85 (''Hand Granate M1985'') is a round fragmentation hand grenade designed for the Swiss Armed Forces, and is still produced by RUAG Ammotec in Switzerland. HG 85 is the internal designation of the Swiss Army The Swiss Armed Forces (; ; ; ; ) are the military and security force of Switzerland, consisting of land and air service branches. Under the country's militia system, regular soldiers constitute a small part of the military and the rest are ... and replaced the HG 43 from World War II. On detonation, the steel body containing of TNT releases around 1,800 fragments, weighing on average . United Kingdom, UK grenade range safety data suggests the L109 (see-#Variants, Variants ) and by extension all live versions – may represent a danger at ranges up to . It is primarily intended for use during urban warfare, fighting in built-up areas, trench clearing, and wood clearing. It is effective against unprotected personnel up to away, and protected personnel up to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
M61 Grenade
The M26 is a fragmentation hand grenade developed by the United States military. It entered service in 1952 and was first used in combat during the Korean War, replacing the Mk 2 of World War II. The M26 series was the primary fragmentation grenade used by American forces in the Vietnam War. It was replaced by the M33 series grenade. Its distinct lemon shape led it to being nicknamed the "lemon grenade" (compare the Russian F1 and American Mk 2 "pineapple" grenades). History The M26 series was created after World War II to meet criticisms of the Mk 2. Rather than relying on a cast body to produce fragments like the Mk 2 the M26 had a thin sheet-metal body and the fragments were instead created by a notched wire coiled up inside which produced smaller fragments but a greater number traveling at a higher velocity and distributed them more evenly than the Mk 2, giving it a larger effective casualty producing radius. The fragments were also more consistently sized posing less o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hand Grenade
A grenade is a small explosive weapon typically thrown by hand (also called hand grenade), but can also refer to a Shell (projectile), shell (explosive projectile) shot from the muzzle of a rifle (as a rifle grenade) or a grenade launcher. A modern hand grenade generally consists of an explosive charge ("filler"), a detonator mechanism, an internal Firing pin, striker to trigger the detonator, an arming safety secured by a transport safety. The user removes the transport safety before throwing, and once the grenade leaves the hand the arming safety gets released, allowing the striker to trigger a Percussion cap, primer that ignites a fuze (sometimes called the delay element), which burns down to the detonator and explodes the main charge. Grenades work by dispersing fragments (fragmentation grenades), shockwaves (High explosive, high-explosive, Anti-tank grenade, anti-tank and stun grenades), chemical aerosols (Smoke grenade, smoke, Grenade#Chemical and gas, gas and Grenade#Chemi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
L-carrier
The L-carrier system was one of a series of carrier systems developed by AT&T for high-capacity transmission for long-distance communications. It was the first designed to handle hundreds of Voice frequency, voice frequency telephone lines, compared to earlier carrier systems which handled 12 or fewer channels. Over a period from the late 1930s to the 1970s, the system evolved in six significant phases of development, designated by Bell System engineers as L-1 through L-5, and L-5E. Coaxial cable was the principal transmission medium in all stages, initially lending the system another description i.e. the ''coaxial system''.E.L. Green, ''The Coaxial Cable System'', Bell Laboratories Record 15(9) p274 (May 1937) It was the successor to a series of previous carrier systems, typically identified by capital letters. In the 1960s, the system was hardened against the dangers of the Cold War using complete placement of all terminal and repeater equipment in hardened underground vaults. In ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Low-alloy Special Purpose Steel
Low-alloy special purpose steel is a grade of tool steel characterized by its proportion of iron to other elements, the kind of elements in its composition, and its treatment during the manufacturing process. The three ASTM established grades of low-alloy special purpose steel are L2, L3, and L6. This grade originally contained L1, L4, L5 and L7 as well as three F grades (F1, F2, and F3) but because of falling demand only grades L2 and L6 remain in production. L2 L2 grade steel comes in medium-carbon (0.45%-0.65%) and high-carbon (0.65%-1.1%) formats. L6 L6 is the most commonly encountered and most frequently made variety of these steels. It is known for its high wear resistance and its toughness. Applications Applications for the L-series of tool steels have included precision gauges, bearings, rollers, cold-heading dies, swaging dies, feed fingers, spindles, jigs, shears, punches, and drills. They are also used for machining arbors, cams, chucks, and collets. References< ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ridge Regression
Ridge regression (also known as Tikhonov regularization, named for Andrey Tikhonov) is a method of estimating the coefficients of multiple- regression models in scenarios where the independent variables are highly correlated. It has been used in many fields including econometrics, chemistry, and engineering. It is a method of regularization of ill-posed problems. It is particularly useful to mitigate the problem of multicollinearity in linear regression, which commonly occurs in models with large numbers of parameters. In general, the method provides improved efficiency in parameter estimation problems in exchange for a tolerable amount of bias (see bias–variance tradeoff). The theory was first introduced by Hoerl and Kennard in 1970 in their ''Technometrics'' papers "Ridge regressions: biased estimation of nonorthogonal problems" and "Ridge regressions: applications in nonorthogonal problems". Ridge regression was developed as a possible solution to the imprecision of least ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Projective Special Linear Group
In mathematics, especially in the group theoretic area of algebra, the projective linear group (also known as the projective general linear group or PGL) is the induced action of the general linear group of a vector space ''V'' on the associated projective space P(''V''). Explicitly, the projective linear group is the quotient group : PGL(''V'') = GL(''V'')/Z(''V'') where GL(''V'') is the general linear group of ''V'' and Z(''V'') is the subgroup of all nonzero scalar transformations of ''V''; these are quotiented out because they act trivially on the projective space and they form the kernel of the action, and the notation "Z" reflects that the scalar transformations form the center of the general linear group. The projective special linear group, PSL, is defined analogously, as the induced action of the special linear group on the associated projective space. Explicitly: : PSL(''V'') = SL(''V'')/SZ(''V'') where SL(''V'') is the special linear group over ''V'' and SZ(''V ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
L² Cohomology
In mathematics, L2 cohomology is a cohomology theory for smooth non-compact manifolds ''M'' with Riemannian metric. It is defined in the same way as de Rham cohomology except that one uses square-integrable differential forms. The notion of square-integrability makes sense because the metric on ''M'' gives rise to a norm on differential forms and a volume form. L2 cohomology, which grew in part out of L2 d-bar estimates from the 1960s, was studied cohomologically, independently by Steven Zucker (1978) and Jeff Cheeger (1979). It is closely related to intersection cohomology; indeed, the results in the preceding cited works can be expressed in terms of intersection cohomology. Another such result is the Zucker conjecture, which states that for a Hermitian locally symmetric variety the L2 cohomology is isomorphic to the intersection cohomology (with the middle perversity) of its Baily–Borel compactification (Zucker 1982). This was proved in different ways by Eduard Looijenga (19 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
