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Boarding and pool ladders, also swim ladders and dive ladders. A ladder may be used on the side or stern of a boat, to climb into it from the water, and in a swimming pool, to climb out and sometimes in. Swimming pool ladders are usually made from plastic, wood or metal steps with a textured upper surface for grip and metal rails at the sides ...
Pool-and-weir fish ladder at Bonneville Dam on the Columbia River Drone video of a fish way in Estonia, on the river Jägala FERC fish ladder safety sign. A fish ladder, also known as a fishway, fish pass, fish steps, or fish cannon, is a structure on or around artificial and natural barriers (such as dams, locks and waterfalls) to facilitate diadromous fishes' natural migration as well as ...
Attic ladders typically consist of a ladder with wider steps and a steep slope. [1] A drawstring will hang down to allow the ladder to be manually extended. Attic ladders are usually made of wood, metal, aluminum, or fiberglass. Also, fire departments carry attic ladders on fire apparatus for use to
The fish ladder consists of 34 separate pools, each 50 centimetres (1.6 ft) higher than the last and covering a distance of 310 metres (340 yd). [3] Each pool has a 1-metre (3 ft 3 in) opening below the water level to allow the fish to pass to the next pool; a continuous flow of water maintains the water level in the pools. [4]
The step-index profile corresponds to a power-law index profile with the profile parameter approaching infinity. The step-index profile is used in most single-mode fibers [1] and some multimode fibers. [2] A step-index fiber is characterized by the core and cladding refractive indices n 1 and n 2 and the core and cladding radii a and b ...