|
L2 (Scooter)
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 2 ... [...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 influence of two massive orbiting bodies. Mathematically, this involves the solution of the restricted three-body problem in which two bodies are far more massive than the third. 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 few orbit corrections are needed to maintain the desired orbit. Small objects placed in orbit at Lagrange points are in equilibrium in at least two directions relative to the center of mass of the large bodies. For any combination of two orbital bodies there are five Lagrange points, L1 to L5, all in the orbital plane of the two l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
L2 Space
In mathematics, a square-integrable function, also called a quadratically integrable function or L^2 function or square-summable function, is a real- or complex-valued measurable function for which the integral of the square of the absolute value is finite. Thus, square-integrability on the real line (-\infty,+\infty) is defined as follows. One may also speak of quadratic integrability over bounded intervals such as ,b/math> for a \leq b. An equivalent definition is to say that the square of the function itself (rather than of its absolute value) is Lebesgue integrable. For this to be true, the integrals of the positive and negative portions of the real part must both be finite, as well as those for the imaginary part. The vector space of square integrable functions (with respect to Lebesgue measure) forms the ''Lp'' space with p=2. Among the ''Lp'' spaces, the class of square integrable functions is unique in being compatible with an inner product, which allows notions ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arado L II
The Arado L II was a 1920s German two-seat, high-wing touring monoplane. In 1930, a revised version with folding wings and improved undercarriage, the L IIa first flew, and four examples took part in the Challenge International de Tourisme 1930 The International Touring Competition in 1930 (french: Challenge International de Tourisme) was the second FAI international touring aircraft contest, that took place between July 18 and August 8, 1930 in Berlin, Germany. Four Challenges, from 1929 ..., starting from Berlin-Tempelhof airport, but none placed, and one crashed early in the race. Two examples competed in the ' in 1931. Specifications (L IIa) Data from German Aviation 1919 – 1945 Notes Further reading * * * ''World Aircraft Information Files.'' Brightstar Publishing, London. File 889 Sheet 73 {{Arado aircraft Single-engined tractor aircraft High-wing aircraft 1920s German sport aircraft L II Aircraft first flown in 1929 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
LZ 18 (L 2)
''LZ 18'' (Navy designation ''L 2'') was the second Zeppelin airship to be bought by the Imperial German Navy. It caught fire and crashed with the loss of all aboard on 17 October 1913 before entering service. Design On 18 January 1913 Admiral Alfred von Tirpitz, Secretary of State of the German Imperial Naval Office, got Kaiser Wilhelm II to agree to a five-year expansion program of German naval airship strength. A contract was placed for the first airship on 30 January, one requirement being that the craft should be capable of bombing England. The design was heavily influenced by the naval architect Felix Pietzker, who was an advisor to the German Admiralty Aviation Department. Construction started in May. The length and overall height of the ship were limited by the size of the Navy's airship shed at Fuhlsbüttel, but Pietzker's proposals enabled the diameter of the airship to be increased without increasing overall height firstly by changing the position of the keel, mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
GPS Signals
GPS signals are broadcast by Global Positioning System satellites to enable satellite navigation. Receivers on or near the Earth's surface can determine location, time, and velocity using this information. 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, used to measure the distance to the satellite, and navigation messages. The navigation messages include ''ephemeris'' data, used to calculate the position of each satellite in orbit, and 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 L1C are ''modernized signals,'' and only broadcast by newer s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sterling Submachine Gun
The Sterling submachine gun is a British submachine gun (SMG). It was tested with the British Army in 1944–1945 as a replacement for the Sten but it did not start to replace it until 1953. A successful and reliable design, it remained as standard issue with the British Army until 1994, when it began to be replaced by the L85A1 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 ... [...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 still produced by RUAG Ammotec in Switzerland. HG 85 is the internal designation of the Swiss Army and replaces the HG 43 from WWII. On detonation the steel body, containing 155 g TNT, releases around 1800 fragments weighing on average 0.1 grams. UK grenade range safety data suggests the L109 – and by extension all live versions – may represent a danger at ranges up to 200 m. Intended for use mainly when fighting in built-up areas, trench clearing, and wood clearing, it is effective against unprotected personnel up to away, and protected personnel up to . Function The grenade is spherical with a bushing on the top threaded internally to accept the DM 82 CH fuze mechanism. Due to its specially constructed fuze and packaging, the grenade is considered very secure. It is designed to be effective against opponents wearing body armour, up to 20 layers of Ke ... [...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 around 1952 and was used in combat during the Korean War. Its distinct lemon shape led it to being nicknamed the "lemon grenade" (compare the Russian F1 grenade (Russia), F1 grenade and American Mk 2 grenade, Mk 2 "pineapple" grenade, with similar nicknames). Fragmentation is enhanced by a special notched fragmentation coil that lies along the inside of the grenade's body. This coil had a circular cross-section in the M26 grenade and an improved square cross-section in the M26A1 and later designs. The grenades were stored inside two-part cylindrical fiberboard shipping tubes (Container M289) and were packed 25 or 30 to a crate. History The M26 was developed as a result of studies on the Mk 2 grenade, Mk 2. Unlike its previous counterpart, its M204A1 fuse creates no tell-tale smoke or sparks when ignited and its powder train is almost silent while it burns down. Its Composition ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hand Grenade
A grenade is an explosive weapon typically thrown by hand (also called hand grenade), but can also refer to a 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 striker to trigger the detonator, and a safety lever secured by a cotter pin. The user removes the safety pin before throwing, and once the grenade leaves the hand the safety lever gets released, allowing the striker to trigger a 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, anti-tank and stun grenades), chemical aerosols (smoke and gas grenades) or fire ( incendiary grenades). Fragmentation grenades ("frags") are probably the most common in modern armies, and when the word ''gre ... [...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. 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. Initial development and testing of the coaxial system took place between 1935 and 1937 on a test bed of a 95-mile two-way coaxial cable between locations in New York Cit ... [...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 ASTM International, formerly known as American Society for Testing and Materials, is an international standards organization that develops and publishes voluntary consensus technical standards for a wide range of materials, products, systems, an ... 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 ... [...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'') is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
