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Strong Link Weak Link
A strong link/weak link and exclusion zone nuclear detonation mechanism is a type of safety mechanism employed in the arming and firing mechanisms of modern nuclear weapons. The safety mechanism starts by enclosing the electronics and mechanical components used to arm and fire the nuclear weapon with a mechanical and electrical isolation barrier, the ''energy barrier'', which encloses and defines the ''exclusion zone''. This is insulated from mechanical, thermal, and electrical disruptions (such as static electricity, lightning, or fire). Between the exclusion zone and the actual detonators, a normally-disconnected link mechanism is used, such as a switch which has a built-in motor to activate it. The arming system has to activate the switch in order to connect the firing circuits to the detonators in the weapon. This disconnection, which requires the arming mechanism to operate, is called the ''strong link''. It is possible for an accident (rocket explosion, airplane crash, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Strong Link-weak Link System
Strong may refer to: Education * The Strong, an educational institution in Rochester, New York, United States * Strong Hall (Lawrence, Kansas), an administrative hall of the University of Kansas * Strong School, New Haven, Connecticut, United States, an overflow school for district kindergartners and first graders Music Albums * ''Strong (Tyler Hubbard album)'', 2024 * Strong (Anette Olzon album), ''Strong'' (Anette Olzon album), 2021 * Strong (Arrested Development album), ''Strong'' (Arrested Development album), 2010 * Strong (Michelle Wright album), ''Strong'' (Michelle Wright album), 2013 * Strong (Thomas Anders album), ''Strong'' (Thomas Anders album), 2010 * Strong (Tracy Lawrence album), ''Strong'' (Tracy Lawrence album), 2004 * ''Strong'', a 2000 album by Clare Quilty (group), Clare Quilty Songs * Strong (London Grammar song), "Strong" (London Grammar song), 2013 * Strong (One Direction song), "Strong" (One Direction song), 2013 * Strong (Robbie Williams song), "Strong" (R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pulse-width Modulation
Pulse-width modulation (PWM), also known as pulse-duration modulation (PDM) or pulse-length modulation (PLM), is any method of representing a signal as a rectangular wave with a varying duty cycle (and for some methods also a varying period). PWM is useful for controlling the average power or amplitude delivered by an electrical signal. The average value of voltage (and current) fed to the load is controlled by switching the supply between 0 and 100% at a rate faster than it takes the load to change significantly. The longer the switch is on, the higher the total power supplied to the load. Along with maximum power point tracking (MPPT), it is one of the primary methods of controlling the output of solar panels to that which can be utilized by a battery. PWM is particularly suited for running inertial loads such as motors, which are not as easily affected by this discrete switching. The goal of PWM is to control a load; however, the PWM switching frequency must be sele ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NASA
The National Aeronautics and Space Administration (NASA ) is an independent agencies of the United States government, independent agency of the federal government of the United States, US federal government responsible for the United States's civil list of government space agencies, space program, aeronautics research and outer space, space research. National Aeronautics and Space Act, Established in 1958, it succeeded the National Advisory Committee for Aeronautics (NACA) to give the American space development effort a distinct civilian orientation, emphasizing peaceful applications in space science. It has since led most of America's space exploration programs, including Project Mercury, Project Gemini, the 1968–1972 Apollo program missions, the Skylab space station, and the Space Shuttle. Currently, NASA supports the International Space Station (ISS) along with the Commercial Crew Program and oversees the development of the Orion (spacecraft), Orion spacecraft and the Sp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Defense Technical Information Center
The Defense Technical Information Center (DTIC, ) is the repository for research and engineering information for the United States Department of Defense (DoD). DTIC's services are available to DoD personnel, federal government personnel, federal contractors and selected academic institutions. The general public can access unclassified information through its public website. History The DTIC traces its history to the June 1945 formation of the Air Documents Research Center (ADRC), a joint effort of the US Army Air Force, US Navy and Royal Air Force to build a single collection of captured German aeronautical research, based in London. The ADRC was initially tasked with the sorting of the document collection into three broad groups; documents that would assist the war in the Pacific theater, documents of immediate intelligence interest to the United States or British forces and documents of interest for future research. With the ending of the war in 1945, the ADRC moved to Wrig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sandia National Laboratory
Sandia National Laboratories (SNL), also known as Sandia, is one of three research and development laboratories of the United States Department of Energy's National Nuclear Security Administration (NNSA). Headquartered in Kirtland Air Force Base in Albuquerque, New Mexico, it has a second principal facility next to Lawrence Livermore National Laboratory in Livermore, California, and a test facility in Waimea, Kauai, Hawaii. Sandia is owned by the U.S. federal government but privately managed and operated by National Technology and Engineering Solutions of Sandia, a wholly owned subsidiary of Honeywell International. Established in 1949, SNL is a "multimission laboratory" with the primary goal of advancing U.S. national security by developing various science-based technologies. Its work spans roughly 70 areas of activity, including nuclear deterrence, arms control, nonproliferation, hazardous waste disposal, and climate change. Sandia hosts a wide variety of research initia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nuclear Weapon Design
Nuclear weapons design are physical, chemical, and engineering arrangements that cause the physics package of a nuclear weapon to detonate. There are three existing basic design types: # Pure fission weapons are the simplest, least technically demanding, were the first nuclear weapons built, and so far the only type ever used in warfare, by the United States on Empire of Japan, Japan in World War II. # Boosted fission weapons are fission weapons that use nuclear fusion reactions to generate high-energy neutrons that accelerate the fission chain reaction and increase its efficiency. Boosting can more than double the weapon's fission energy yield. # Staged thermonuclear weapons are arrangements of two or more "stages", most usually two, where the weapon derives a significant fraction of its energy from nuclear fusion (as well as, usually, nuclear fission), . The first stage is typically a boosted fission weapon (except for the earliest thermonuclear weapons, which used a pure fission ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
TATB
TATB, triaminotrinitrobenzene or 2,4,6-triamino-1,3,5-trinitrobenzene is an aromatic explosive, based on the basic six-carbon benzene ring structure with three nitro functional groups (NO2) and three amine (NH2) groups attached, alternating around the ring. TATB is a very powerful explosive (somewhat less powerful than RDX, but more than TNT), but it is extremely insensitive to shock, vibration, fire, or impact. Because it is so difficult to detonate by accident, even under severe conditions, it has become preferred for applications where extreme safety is required, such as the explosives used in nuclear weapons, where accidental detonation during an airplane crash or rocket misfiring could potentially detonate the fissile core. All British nuclear warheads use TATB-based explosives in their primary stage. According to David Albright, South Africa's nuclear weapons used TATB to increase their safety. TATB is normally used as the explosive ingredient in plastic bonded expl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Insensitive High Explosive
'Insensitivity' (sensi'tivitē) refers to a lack of sensitivity for other's feelings. It may also refer to: * "Insensitive" (song), a 1995 song by Canadian singer Jann Arden * ''Insensitive'' (House), an episode of the TV series ''House'' * Culturally insensitive See also * Insensibility (other) " Insensibility" is a poem written by Wilfred Owen during the First World War which explores the effect of warfare on soldiers. Insensibility may also refer to: * Insensibility (intelligence), a lack of understanding, reason, wit, or sense * In ... * Senseless (other) * {{disambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Permissive Action Link
A permissive action link (PAL) is an access control security device for nuclear weapons. Its purpose is to prevent unauthorized arming plug, arming or Nuclear chain reaction, detonation of a nuclear weapon. The United States Department of Defense definition is: The earliest PALs were little more than locks introduced into the control and firing systems of a nuclear weapon, designed to prevent a person from detonating it or removing its Nuclear weapon design, safety features. More recent innovations have included Encryption, encrypting the firing parameters it is programmed with, which must be decrypted to properly detonate the warhead, and anti-handling device, anti-tamper systems which intentionally mis-detonate the weapon if its other security features are defeated, destroying it without giving rise to a nuclear explosion. History Background Permissive action links were developed in the United States in a gradual process from the Nuclear weapons testing, first use of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hardpoint
A hardpoint is an attachment location on a structural frame designed to transfer force and carry an external or internal structural load, load. The term is usually used to refer to the mounting points (more formally known as a weapon station or station) on the airframe of military aircraft that carry list of aircraft weapons, weapons (e.g. gun pods and rocket pods), aircraft ordnance, ordnances (aerial bomb, bombs and guided missile, missiles) and support equipment (e.g. flare (countermeasure), flares and electronic countermeasure, countermeasures, targeting pods or drop tanks), and also include hardpoints (also known as pylons) on the wings or fuselage of a military transport aircraft, commercial airliner or private jet where external turbofan jet engines are often mounted. Aircraft In aeronautics, the term ''station'' is used to refer to a point of carriage on the frame of an aircraft. A station is usually rated to carry a certain amount of payload. It is a design number whi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
