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Airsoft Pellet
Airsoft pellets are spherical projectiles used by airsoft guns. Typically made of plastic, they usually measure around in diameter (though selective models use 8 mm), and weigh , with the most common weights being 0.12 g and 0.20 g, while 0.25 g, 0.28 g, 0.30 g and 0.40 g pellets are also commonplace. Though frequently referred to as "''BB''s" among airsoft users, these pellets are ''not'' the same as either of the 4.5 mm metal projectiles that BB guns fire, or the -sized birdshot from which the term "BB" originated. Variants Although the majority of pellets bought and used are simple spherical projectiles made of plastic, some of the following special varieties can be used to give a player an advantage, such as higher quality pellets. Biodegradable Biodegradable pellets are available, and are often required by outdoor fields where sweeping is not an option. Conventional pellets pollute the environment, as most non-biodegradable pellets have ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Airsoft Pellets
Airsoft pellets are spherical projectiles used by airsoft guns. Typically made of plastic, they usually measure around in diameter (though selective models use 8 mm), and weigh , with the most common weights being 0.12 g and 0.20 g, while 0.25 g, 0.28 g, 0.30 g and 0.40 g pellets are also commonplace. Though frequently referred to as "''BB''s" among airsoft users, these pellets are ''not'' the same as either of the 4.5 mm metal projectiles that BB guns fire, or the -sized birdshot from which the term "BB" originated. Variants Although the majority of pellets bought and used are simple spherical projectiles made of plastic, some of the following special varieties can be used to give a player an advantage, such as higher quality pellets. Biodegradable Biodegradable pellets are available, and are often required by outdoor fields where sweeping is not an option. Conventional pellets pollute the environment, as most non-biodegradable pellets have ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Santee, California
Santee is a suburban city in San Diego County, California, with a population of 60,075 at the 2020 census. Although it is a part of the East County region, Santee is located just from the Pacific Ocean. The city is connected to the coastline by State Route 52, a six-lane freeway that runs from Interstate 5 in La Jolla to State Route 67 in El Cajon. The city is bisected by the San Diego River, a linear greenbelt that includes parks, trails and more than of natural riparian habitat. History The region was the homeland of the Kumeyaay people. These original residents established the village of ''Sinyeweche'' on the banks of the San Diego River in the present day Santee area. The city is named after Milton Santee, the second husband of Jennie Blodgett, whose first husband was George A. Cowles, a pioneer rancher and businessperson in the San Diego County area. Geography Santee shares the northern part of a valley with the city of El Cajon. The city is bisected by the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sniping
A sniper is a military/paramilitary marksman who engages targets from positions of concealment or at distances exceeding the target's detection capabilities. Snipers generally have specialized training and are equipped with high-precision rifles and high-magnification optics, and often also serve as scouts/observers feeding tactical information back to their units or command headquarters. In addition to long-range and high-grade marksmanship, military snipers are trained in a variety of special operation techniques: detection, stalking, target range estimation methods, camouflage, tracking, bushcraft, field craft, infiltration, special reconnaissance and observation, surveillance and target acquisition. Etymology The name "sniper" comes from the verb "to snipe", which originated in the 1770s among soldiers in British India in reference to shooting snipes, a wader that was considered an extremely challenging game bird for hunters due to its alertness, camouflaging ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Assault Troops
Shock troops or assault troops are formations created to lead an attack. They are often better trained and equipped than other infantry, and expected to take heavy casualties even in successful operations. "Shock troop" is a calque, a loose translation of the German word ''Stoßtrupp''. Assault troops are typically organized for mobility with the intention that they will penetrate enemy defenses and attack into the enemy's vulnerable rear areas. Any specialized, elite unit formed to fight an engagement via overwhelming assault (usually) would be considered shock troops, as opposed to "special forces" or commando-style units (intended mostly for covert operations). Both types of units could fight behind enemy lines, by surprise if required, however. Although the term "shock troops" became popular in the 20th century, the concept is not new, and Western European armies in past centuries called them the forlorn hope. Presently, the term is rarely used, as the strategic concept ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crystal Lattice Structure
In crystallography, crystal structure is a description of the ordered arrangement of atoms, ions or molecules in a crystalline material. Ordered structures occur from the intrinsic nature of the constituent particles to form symmetric patterns that repeat along the principal directions of three-dimensional space in matter. The smallest group of particles in the material that constitutes this repeating pattern is the unit cell of the structure. The unit cell completely reflects the symmetry and structure of the entire crystal, which is built up by repetitive translation of the unit cell along its principal axes. The translation vectors define the nodes of the Bravais lattice. The lengths of the principal axes, or edges, of the unit cell and the angles between them are the lattice constants, also called ''lattice parameters'' or ''cell parameters''. The symmetry properties of the crystal are described by the concept of space groups. All possible symmetric arrangements of particle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carbon Dioxide
Carbon dioxide ( chemical formula ) is a chemical compound made up of molecules that each have one carbon atom covalently double bonded to two oxygen atoms. It is found in the gas state at room temperature. In the air, carbon dioxide is transparent to visible light but absorbs infrared radiation, acting as a greenhouse gas. It is a trace gas in Earth's atmosphere at 421 parts per million (ppm), or about 0.04% by volume (as of May 2022), having risen from pre-industrial levels of 280 ppm. Burning fossil fuels is the primary cause of these increased CO2 concentrations and also the primary cause of climate change.IPCC (2022Summary for policy makersiClimate Change 2022: Mitigation of Climate Change. Contribution of Working Group III to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA Carbon dioxide is soluble in water and is found in groundwater, lakes, ice ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eyewear
Eyewear consists of items and accessories worn on or over the eyes, for fashion or adornment, protection against the environment, and to improve or enhance visual acuity. Common forms of eyewear include glasses (also called ''eyeglasses'' or ''spectacles''), sunglasses, and contact lenses. Eyewear can also include more utilitarian forms of eye protection, such as goggles. Conversely, blindfolds are a form of eyewear used to ''block'' vision for a variety of purposes. {{Glasses Sunglasses ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silica
Silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula , most commonly found in nature as quartz and in various living organisms. In many parts of the world, silica is the major constituent of sand. Silica is one of the most complex and most abundant families of materials, existing as a compound of several minerals and as a synthetic product. Notable examples include fused quartz, fumed silica, silica gel, opal and aerogels. It is used in structural materials, microelectronics (as an electrical insulator), and as components in the food and pharmaceutical industries. Structure In the majority of silicates, the silicon atom shows tetrahedral coordination, with four oxygen atoms surrounding a central Si atomsee 3-D Unit Cell. Thus, SiO2 forms 3-dimensional network solids in which each silicon atom is covalently bonded in a tetrahedral manner to 4 oxygen atoms. In contrast, CO2 is a linear molecule. The starkly different structures of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hop-up (airsoft)
Hop-up {{cite book, author=Kovacs Bloomfield, title=Airsoft! How to Win an Airsoft War: Secret Tactics for Success Revealed!, url=https://books.google.com/books?id=Y8tuufbh_NAC&pg=PA20, date=1 March 2012, publisher=Ebook.GD Publishing, isbn=978-1-61323-030-5, pages=17–20 is the backspin put on airsoft pellets and BBs to increase their range via the Magnus effect. Hop-up devices apply backspin to the projectile reducing the air pressure on its top side. This causes the plastic pellet to fall less over a given distance than it would without the spin applied, extending the effective range of the weapon without increasing velocity. In airsoft guns, this is usually implemented as a projection (called a bucking) into the path of the projectile, on the top of the barrel. The bucking momentarily hinders the top side of the projectile, imparting a backspin that can exceed 1,000 rpm (17 rotations per second). This is usually adjustable so that the effect can be tuned to suit the weight o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paintball
Paintball is a competitive team shooting sport in which players eliminate opponents from play by hitting them with spherical dye-filled gelatin capsules called paintballs that break upon impact. Paintballs are usually shot using low-energy air weapons called paintball markers that are powered by compressed air or carbon dioxide and were originally designed for remotely marking trees and cattle. The game was invented in May 1981 in New Hampshire by Hayes Noel, a Wall Street stock trader, and Charles Gaines, an outdoorsman and writer. A debate arose between them about whether a city-dweller had the instinct to survive in the woods against a man who had spent his youth hunting, fishing, and building cabins. The two men chanced upon an advertisement for a paint gun in a farm catalogue and were inspired to use it to settle their argument with 10 other men all in individual competition, eventually creating the sport of paintball. The sport is played for recreation and is also ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hop-up (airsoft)
Hop-up {{cite book, author=Kovacs Bloomfield, title=Airsoft! How to Win an Airsoft War: Secret Tactics for Success Revealed!, url=https://books.google.com/books?id=Y8tuufbh_NAC&pg=PA20, date=1 March 2012, publisher=Ebook.GD Publishing, isbn=978-1-61323-030-5, pages=17–20 is the backspin put on airsoft pellets and BBs to increase their range via the Magnus effect. Hop-up devices apply backspin to the projectile reducing the air pressure on its top side. This causes the plastic pellet to fall less over a given distance than it would without the spin applied, extending the effective range of the weapon without increasing velocity. In airsoft guns, this is usually implemented as a projection (called a bucking) into the path of the projectile, on the top of the barrel. The bucking momentarily hinders the top side of the projectile, imparting a backspin that can exceed 1,000 rpm (17 rotations per second). This is usually adjustable so that the effect can be tuned to suit the weight o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Suppressor
A silencer, also known as a sound suppressor, suppressor, or sound moderator, is a muzzle device that reduces the acoustic intensity of the muzzle report (sound of a gunshot) and muzzle rise when a gun (firearm or air gun) is discharged, by modulating the speed and pressure of the propellant gas from the muzzle and hence suppressing the muzzle blast. Like other muzzle devices, a silencer can be a detachable accessory mounted to the muzzle, or an integral part of the barrel. A typical silencer is a metallic (usually stainless steel or titanium) cylinder containing internal sound baffles, with a hollow bore to allow the projectile (bullet) to exit normally. During firing, the bullet flies through the bore with little hindrance, but most of the expanding gas ejecta behind it is retained through a longer and convoluted escape path created by the baffles, prolonging the release time. This slows down the gas and dissipates its kinetic energy into a larger surface area, reduci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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