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Haplogroup L3 (mtDNA)
Haplogroup L3 is a human mitochondrial DNA (mtDNA) haplogroup. The clade has played a pivotal role in the early dispersal of anatomically modern humans. It is strongly associated with the out-of-Africa migration of modern humans of about 70–50,000 years ago. It is inherited by all modern non-African populations, as well as by some populations in Africa. Origin Haplogroup L3 arose close to 70,000 years ago, near the time of the recent out-of-Africa event. This dispersal originated in East Africa and expanded to West Asia, and further to South and Southeast Asia in the course of a few millennia, and some research suggests that L3 participated in this migration out of Africa. A 2007 estimate for the age of L3 suggested a range of 104–84,000 years ago. More recent analyses, including Soares et al. (2012) arrive at a more recent date, of roughly 70–60,000 years ago. Soares et al. also suggest that L3 most likely expanded from East Africa into Eurasia sometime around 65–55, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
L3/35
The L3/35 or Carro Veloce CV-35 was an Italian tankette that saw combat before and during World War II. Although designated a light tank by the Italian Army, its turretless configuration, weight and firepower make it closer to contemporary tankettes. It was the most numerous Italian armoured fighting vehicle and saw service almost everywhere the Italians fought in World War II but proved inadequate for modern warfare, having too thin armour and weak armament of only machine guns. It was cheaply produced but because of its light armaments and armour it was reserved to mostly colonial, policing, reconnaissance, and supply duties. However, given its low production costs, proved to be efficient in the Second Italo-Abyssinian War, Spanish Civil War and the Greco-Italian War where it provided reliable support to Italian infantry and disrupted enemy lines. Development The L3/35 was developed from the Carden Loyd Mark VI tankette, four of which were imported from Britain in 1929. The f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
L3Harris Technologies
L3Harris Technologies (L3Harris) is an American technology company, defense contractor, and information technology services provider that produces C6ISR systems and products, wireless equipment, tactical radios, avionics and electronic systems, night vision equipment, and both terrestrial and spaceborne antennas for use in the government, defense, and commercial sectors. They specialize in surveillance solutions, microwave weaponry, and electronic warfare. It was formed from the merger of L3 Technologies (formerly L-3 Communications) and Harris Corporation on June 29, 2019, and was expected to be the sixth-largest defense contractor in the United States. History The "Harris Automatic Press Company" was founded by Alfred S. Harris in Niles, Ohio, in 1895. The company spent the next 60 years developing lithographic processes and printing presses before acquiring typesetting company Intertype Corporation. In 1967, they merged with Radiation, Inc. of Melbourne, Florida, a develop ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
L3 Technologies
L3 Technologies, formerly L-3 Communications Holdings, was an American company that supplied command and control, communications, Intelligence (information gathering), intelligence, surveillance and reconnaissance (C3ISR) systems and products, avionics, ocean products, training devices and services, instrumentation, aerospace, and navigation products. Its customers included the United States Department of Defense, Department of Defense, Department of Homeland Security, United States Intelligence Community, NASA, aerospace contractors, and commercial telecommunications and wireless customers. In 2019, it merged with Harris Corporation and was renamed to L3Harris Technologies. L3 was headquartered in Murray Hill, Manhattan, New York City. History L3 was formed as L-3 Communications in 1997 to acquire certain business units from Lockheed Martin that had previously been part of Loral Corporation. These units had belonged to Lockheed Corporation and Martin Marietta, which had merge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
L3/33
The Carro Veloce 33 (CV 33) or L3/33 was a tankette originally built in 1933 and used by the Italian Army before and during World War II. It was based on the imported British Carden Loyd tankette (license-built by Italy as the CV 29). Many CV 33s were retrofitted to meet the specifications of the CV 35 in 1935. In 1938, the CV 33 was renamed the "L3/33" while the CV 35 became the "L3/35s." The original CV 33 carried a two-man crew protected by 12 mm of welded armour and was armed with a single 6.5 mm machine gun. The L3/33 saw action in China, Spain, France, the Balkans, North Africa, Italian East Africa, Italy, and Russia. Variants L3/33 CC The L3/33 CC (Contro Carro, literally "Anti Tank") was based on the L3 tankette. A small number of L3/33s and 35s had their 6.5mm machine guns replaced by a Fucile Controcarri S Mod.39 (20 mm) anti-tank gun, creating an ad-hoc tank destroyer platform. Arriving too late to see action in Libya before the A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
N1/L3
The Soviet crewed lunar programs were a series of programs pursued by the Soviet Union to land humans on the Moon, in competition with the United States Apollo program. The Soviet government publicly denied participating in such a competition, but secretly pursued two programs in the 1960s: crewed lunar flyby missions using Soyuz 7K-L1 (Zond) spacecraft launched with the Proton-K rocket, and a crewed lunar landing using Soyuz 7K-LOK and LK spacecraft launched with the N1 rocket. Following the dual American successes of the first crewed lunar orbit on 24–25 December 1968 (Apollo 8) and the first Moon landing on July 20, 1969 (Apollo 11), and a series of catastrophic N1 failures, both Soviet programs were eventually brought to an end. The Proton-based Zond program was canceled in 1970, and the N1-L3 program was ''de facto'' terminated in 1974 and officially canceled in 1976. Details of both Soviet programs were kept secret until 1990 when the government allowed them to be pu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CPU 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) w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CBD And South East Light Rail
The CBD and South East Light Rail is a light rail line in Sydney, New South Wales, Australia. Construction commenced in October 2015, with services between Circular Quay and Randwick commencing on 14 December 2019 as the L2 Randwick Line, and between Circular Quay and Kingsford on 3 April 2020 as the L3 Kingsford Line. It is part of Sydney's light rail network. Background and initial announcement Since the light rail network's original line opened in 1997, a line through the Sydney central business district had been suggested numerous times but failed to achieve State Government support. This changed in February 2010 when the Keneally Government announced a new line from Haymarket to Circular Quay via Barangaroo. The final route was not decided, with the three options being to send the line north via George Street, Sussex Street or a loop using both. When the O'Farrell Government took office in March 2011, it committed to building a line through the CBD to Barangaro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harris Corporation
Harris Corporation was an American technology company, defense contractor, and information technology services provider that produced wireless equipment, tactical radios, electronic systems, night vision equipment and both terrestrial and spaceborne antennas for use in the government, defense and commercial sectors. They specialized in surveillance solutions, microwave weaponry, and electronic warfare. In 2019, it merged with L3 Technologies to form L3Harris Technologies. Headquartered in Melbourne, Florida, the company had approximately $7 billion of annual revenue. It was the largest private-sector employer in Brevard County, Florida (approximately 6,000). From 1988 to 1999, the company was the parent of Intersil, under the name Harris Semiconductor. In 2016, Harris was named one of the top hundred federal contractors by ''Defense News''. In January 2015, ''Wired'' Magazine ranked Harris Corporation—tied with U.S. Marshals Service—as the number two threat to privacy and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
L3 Microkernel
L4 is a family of second-generation microkernels, used to implement a variety of types of operating systems (OS), though mostly for Unix-like, ''Portable Operating System Interface'' (POSIX) compliant types. L4, like its predecessor microkernel L3, was created by German computer scientist Jochen Liedtke as a response to the poor performance of earlier microkernel-based OSes. Liedtke felt that a system designed from the start for high performance, rather than other goals, could produce a microkernel of practical use. His original implementation in hand-coded Intel i386-specific assembly language code in 1993 sparked intense interest in the computer industry. Since its introduction, L4 has been developed to be cross-platform and to improve security, isolation, and robustness. There have been various re-implementations of the original binary L4 kernel application binary interface (ABI) and its successors, including ''L4Ka::Pistachio'' (Karlsruhe Institute of Technology), ''L4/MIPS' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soyuz 7K-L3
The Soyuz 7K-LOK, or simply LOK (russian: Лунный Орбитальный Корабль, translit=Lunniy Orbitalny Korabl meaning "Lunar Orbital Craft") was a Soviet crewed spacecraft designed to launch men from Earth to orbit the Moon, developed in parallel to the 7K-L1. The LOK would carry two cosmonauts, acting as a mother ship for the LK Lander which would land one crew member to the surface. It was part of the N1-L3 programme which also included the LK lander and the N1 rocket. Design Like the 7K-OK model, the 7K-LOK was divided into three sections, an ellipsoid Orbital Module, the "headlight"-shaped Descent Module, and a cylindrical equipment module. Like the 7K-OK, the 7K-LOK was capable of physically docking with another spacecraft, but lacked the transfer tunnel used on the Apollo (spacecraft), thus forcing the cosmonaut to make a spacewalk from the 7K-LOK's orbital module to the LK Lander using the new Krechet space suit (the predecessor to the Orlan space suits ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
L3 (New York City Bus)
The 14th Street Tunnel shutdown (also referred to as the L Project, the L train shutdown, or the Canarsie Tunnel reconstruction) was the partial closure and reconstruction of the New York City Subway's 14th Street Tunnel that took place from April 2019 to April 2020. The tunnel carries the BMT Canarsie Line (serving the ) under the East River in New York City, connecting the boroughs of Brooklyn and Manhattan, and is used by an average of 225,000 passengers per weekday. A key segment of the 14th Street Tunnel, between the Bedford Avenue station in Brooklyn and the First Avenue station in Manhattan, would be partially closed for 15 to 20 months to allow for necessary and extensive repairs to the underwater tubes after it was flooded and severely damaged during Hurricane Sandy in 2012. Two options were proposed in 2016: a three-year construction period where one tube at a time would be closed or an 18-month closure where both tubes would be worked on simultaneously. The Metrop ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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