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By association, artillery may also refer to the arm of servicethat customarily operates such engines. In some armies, the artillery arm has operated field, coastal, anti-aircraft, and anti-tankartillery; in others these have been separate arms, and with some nations coastal has been a naval or marine responsibility.
The American National Red Cross[ 5 ] is a nonprofit humanitarian organization that provides emergency assistance, disaster relief, and disaster preparedness education in the United States. Clara Barton founded the organization in 1881 after initially learning of the Red Cross from the country of Switzerland. Barton resigned in 1904 with Mabel ...
Nuclear weapons delivery is the technology and systems used to place a nuclear weapon at the position of detonation, on or near its target. Several methods have been developed to carry out this task. Strategic nuclear weapons are used primarily as part of a doctrine of deterrence by threatening large targets, such as cities.
In shooting sports, a shot grouping, or simply group, is the collective pattern of projectile impacts on a target from multiple consecutive shots taken in one shooting session. The tightness of the grouping (the proximity of all the shots to each other) is a measure of the precision of a weapon, and a measure of the shooter's consistency and ...
Counterweight trebuchet used in a siege from the Jami' al-tawarikh, c. 1306-18 [ 1 ][ 2 ] A trebuchet[ nb 1 ] (French: trébuchet) is a type of catapult [ 5 ] that uses a rotating arm with a sling attached to the tip to launch a projectile. It was a common powerful siege engine until the advent of gunpowder. The design of a trebuchet allows it ...
Tortuosity. Tortuosity is widely used as a critical parameter to predict transport properties of porous media, such as rocks and soils. But unlike other standard microstructural properties, the concept of tortuosity is vague with multiple definitions and various evaluation methods introduced in different contexts.
The hit ratio of a cache describes how often a searched-for item is found. More efficient replacement policies track more usage information to improve the hit rate for a given cache size. The latency of a cache describes how long after requesting a desired item the cache can return that item when there is a hit.
External ballistics or exterior ballistics is the part of ballistics that deals with the behavior of a projectile in flight. The projectile may be powered or un-powered, guided or unguided, spin or fin stabilized, flying through an atmosphere or in the vacuum of space, but most certainly flying under the influence of a gravitational field.