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Haplogroup L2 (mtDNA)
Haplogroup L2 is a human mitochondrial DNA (mtDNA) haplogroup with a widespread modern distribution, particularly in Sub equatorial Africa. Its L2a subclade is a somewhat frequent and widely distributed mtDNA cluster on the continent, as well as among African Americans, The highest frequency occurs among the Mbuti Pygmies (64%). Origin L2 is a common lineage in Africa. It is believed to have evolved between 87,000 and 107,000 years ago or approx. 90,000 YBP. Its age and widespread distribution and diversity across the continent makes its exact origin point within Africa difficult to trace with any confidence. L2 Haplotypes is commonly observed in Central & South Eastern African populations, finding shared genetic matches with Southeast Africa and Central Africa. An origin for L2b, L2c, L2d and L2e in Southeastern Africa seems likely. The early diversity of L2 can be observed all over the African Continent, but as we can see in Subclades section below, the highest diversity is fou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
L2 Cache
A CPU cache is a hardware cache used by the central processing unit (CPU) of a computer to reduce the average cost (time or energy) to access data from the main memory. A cache is a smaller, faster memory, located closer to a processor core, which stores copies of the data from frequently used main memory locations. Most CPUs have a hierarchy of multiple cache levels (L1, L2, often L3, and rarely even L4), with different instruction-specific and data-specific caches at level 1. The cache memory is typically implemented with static random-access memory (SRAM), in modern CPUs by far the largest part of them by chip area, but SRAM is not always used for all levels (of I- or D-cache), or even any level, sometimes some latter or all levels are implemented with eDRAM. Other types of caches exist (that are not counted towards the "cache size" of the most important caches mentioned above), such as the translation lookaside buffer (TLB) which is part of the memory management unit (MMU) ... [...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] |
Lumines II
is a 2006 puzzle video game developed by Q Entertainment for the PlayStation Portable (PSP). It was released in November 2006 in Europe 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 further d ... [...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] |
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] |
L2 (music Group)
L2 is a pop duo consisting of New York City based sisters Melissa Labbadia, 22, and Jessica Labbadia, 19. Their music has been featured on many popular celebrity sites, and they have had two singles on the ''Billboard'' Hot Dance/Club chart. Career Early years Melissa and Jessica Labbadia started singing, acting and performing at a young age. They recorded their first demo CD and wrote their first original song in 2005. The sisters went on to perform at many venues in New York City, including Manhattan dance clubs ''Tenjune'' and ''Splash''; the rock clubs ''The Bitter End'', ''DROM'', ''Arlene’s Grocery'', and ''The Cutting Room''; cabaret style at ''Don’t Tell Mama'' in NYC. L2 have also opened for popular performers such as Ryan Cabrera, Donnie Klang and Anberlin. 2011-2012 In 2011, they released their single ''Criminal In Bed''. The song played on Sirius/XM Radio along with many other FM stations. The band made their debut on the Billboard Hot Dance/Club charts with the ... [...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 and American 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. 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 B filler was considered safer than the flake ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
L2 Puppis
L2 Puppis (also known as HD 56096) is a giant star in the constellation of Puppis and is located between the bright stars Canopus and Sirius. It is a semi-regular pulsating star. The designation L2 has a tangled history. This star and another were both labelled with "L" by Nicolas-Louis de Lacaille when he created the constellation Puppis within Argo Navis. The two stars were labelled as "1.L" and "2.L" by Johann Elert Bode in his star catalogue published in 1801. Later authors used L1 and L2, usually with numeric subscripts (i.e. L1 and L2), but occasionally as superscripts. The subscripted designation is now universally used where typography allows for subscripts. L2 Puppis was discovered to be variable by Benjamin Apthorp Gould in 1872, and was listed in Uranometria Argentina as 73 G. Puppis with magnitude 5.10v. It has never been given a formal variable star designation, unlike L1 Puppis which is OU Puppis. L2 Puppis varies in apparent magnitude by about two m ... [...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, a ... 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] |
Advanced Telescope For High Energy Astrophysics
Advanced Telescope for High-ENergy Astrophysics (''Athena'') is an X-ray observatory mission selected by European Space Agency (ESA) within its Cosmic Vision program to address the Hot and Energetic Universe scientific theme. ''Athena'' will operate in the energy range of 0.2–12 keV and will offer spectroscopic and imaging capabilities exceeding those of currently operating X-ray astronomy satellites – e.g. the Chandra X-ray Observatory and XMM-Newton – by at least one order of magnitude on several parameter spaces simultaneously. Mission The primary goals of the mission are to map hot gas structures, determine their physical properties, and search for supermassive black holes. History and development The mission has its roots in two concepts from the early 2000s, XEUS of ESA and Constellation-X Observatory (Con-X) of NASA. Around 2008, these two proposals were merged into the joint NASA/ESA/JAXA International X-ray Observatory (IXO) proposal. In 2011, IXO was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caenorhabditis Elegans
''Caenorhabditis elegans'' () is a free-living transparent nematode about 1 mm in length that lives in temperate soil environments. It is the type species of its genus. The name is a blend of the Greek ''caeno-'' (recent), ''rhabditis'' (rod-like) and Latin ''elegans'' (elegant). In 1900, Maupas initially named it ''Rhabditides elegans.'' Osche placed it in the subgenus ''Caenorhabditis'' in 1952, and in 1955, Dougherty raised ''Caenorhabditis'' to the status of genus. ''C. elegans'' is an unsegmented pseudocoelomate and lacks respiratory or circulatory systems. Most of these nematodes are hermaphrodites and a few are males. Males have specialised tails for mating that include spicules. In 1963, Sydney Brenner proposed research into ''C. elegans,'' primarily in the area of neuronal development. In 1974, he began research into the molecular and developmental biology of ''C. elegans'', which has since been extensively used as a model organism. It was the first multice ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
