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Active heave compensation (AHC) is a technique used on lifting equipment to reduce the influence of waves upon offshore operations. AHC differs from Passive Heave Compensation by having a control system that actively tries to compensate for any movement at a specific point, using power to gain accuracy.
A simple way of considering wave-making resistance is to look at the hull in relation to bow and stern waves. If the length of a ship is half the length of the waves generated, the resulting wave will be very small due to cancellation, and if the length is the same as the wavelength, the wave will be large due to enhancement.
Polynesian navigators thus employed a wide range of techniques including the use of the stars, the movement of ocean currents and wave patterns, the patterns of bioluminescence that indicated the direction in which islands were located, the air and sea interference patterns caused by islands and atolls, the flight of birds, the winds and the ...
There are several distinct types of crab claw rigs, but unlike western rigs, they do not have fixed conventional names. [6] 1846 illustration of a Fijian camakau, a single-outrigger canoe with a canted mast "crane sprit"-type crab claw sail. The need to propel larger and more heavily laden boats led to the increase in vertical sail.
An electromagnetic wave travelling through a medium has a propagation delay determined by the speed of light in that particular medium, or ca. 1 nanosecond per 29.98 centimetres (11.80 in) in a vacuum. An electric signal travelling through a wire has an propagation delay of ca. 1 nanosecond per 15 centimetres (5.9 in). [1]
These “internal waves,” as he calls them, create vortices which bring colder water from the depths of the ocean higher up — important for the planet’s climate.
Here are eight items that are sure to make an appearance in stockings across the South this holiday season. 8 Things Southerners Love To Put In Their Stockings, According To Our Readers Skip to ...
Chris Thomas, a California Department of Forestry and Fire Protection spokesperson, told the military-news site The War Zone that the damaged Super Scooper was one of only two in Cal Fire's ...