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Triton X--100 (C 14 H 22 O(C 2 H 4 O) n) is a nonionic surfactant that has a hydrophilic polyethylene oxide chain (on average it has 9.5 ethylene oxide units) and an aromatic hydrocarbon lipophilic or hydrophobic group. The hydrocarbon group is a 4-(1,1,3,3-tetramethylbutyl)-phenyl group.
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.
arbalest – A late variation of the crossbow that came into use in Europe during the 12th century; archer (practitioner) – One who practices archery (a.k.a. bowman) archer's paradox (effect) – The effect produced by an arrow flexing as it leaves the bow; archery (practice) – The practice of using a bow to shoot arrows
The crossbow as a weapon had been around long before Leonardo's designs. However, his designs made the weapon more advanced and why Leonardo's crossbows stands out. If a crossbow is designed with a narrower shaft and a tapered bolt, which adjusts the nocking of arrows, it greatly improves the airflow of the bow and the drag on arrows.
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]
[22] [23] The matrix crystallizes with the sample and is then deposited on a sample plate, which can be made of a range of materials, from inert metals to inert polymers. The matrix containing the sample molecules is then transferred to the gas phase by pulsed laser irradiation. The makeup of the matrix, interactions between the sample and the ...
The small caliber rounds are perfect for killing animals like birds and rats. Being a crossbow, it does not produce much sound. Even though more powerful weapons were invented, like the air gun, the bullet-shooting crossbow was used extensively throughout history because it was not loud enough to scare prey off. [7]
Gallo-Roman crossbow. Besides the gastraphetes, the ancient world knew a variety of mechanical hand-held weapons similar to the later medieval crossbow. The exact terminology is a subject of continuing scholarly debate.
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