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The crossbow often has a complicated legal status due to its potential use for lethal purposes, and its similarities with both firearms and other archery weapons. The crossbow is, for legal purposes, often categorized as a firearm by various legal jurisdictions (even though it is not considered as a firearm from a technical perspective), despite the fact that no combustion is required to ...
21st-century hunting compound crossbow. A crossbow is a ranged weapon using an elastic launching device consisting of a bow-like assembly called a prod, mounted horizontally on a main frame called a tiller, which is hand-held in a similar fashion to the stock of a long gun. Crossbows shoot arrow-like projectiles called bolts or quarrels.
Surfactin is a cyclic lipopeptide, commonly used as an antibiotic for its capacity as a surfactant. [2] It is an amphiphile capable of withstanding hydrophilic and hydrophobic environments. The Gram-positive bacterial species Bacillus subtilis produces surfactin for its antibiotic effects against competitors. [3]
The propellant charge is placed between two pistons with the projectile in front of one and a mass of shredded plastic in the rear. Unlike most recoilless weapons, it is a true counter-shot weapon, as the mass of the projectile is equal to the mass of the counterweight and they are ejected from the barrel at the same initial velocity. When the ...
This means that the surfactant adsorbs at low surfactant concentrations with its head-group contacting the surface. Depending on the type of head-group and surface, the attraction will have a short-range contribution for both non-ionic and ionic surfactants. Ionic surfactants will also experience a generic electrostatic interaction.
Crossbows were mass-produced in state armouries with designs improving as time went on, such as the use of a mulberry wood stock and brass; a crossbow in 1068 AD could pierce a tree at 140 paces. [27] Crossbows were used in numbers as large as 50,000 starting from the Qin dynasty and upwards of several hundred thousand during the Han. [28]
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