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A plankton net is equipment used for collecting samples of plankton in standing bodies of water. It consists of a towing line and bridles, nylon mesh net, and a cod end. Plankton nets are considered one of the oldest, simplest and least expensive methods of sampling plankton. [1] The plankton net can be used for both vertical and horizontal ...
In such nets, each ring is interlaced with either 4 or 6 adjoining rings. These nets were first used after a French company bought a stock of nets used in the USSR for protecting harbours against submarine intrusion. These nets are referred to as ASM (anti-submarine). [4] Other mesh shapes are also obesrved in rockfall barriers (see below).
Mesh size is 85mm. Construction safety nets are used on high-rise building construction sites to prevent the fall of people or objects from the site. Construction safety nets are the safest and most cost-effective fall prevention system in such an environment. Construction safety nets are typically made from high-density polyethylene (or HDPE ...
Net haulers are usually used to set and haul driftnets, with a drifter capstan on the forepart of the vessel. In developing countries most nets are hauled by hand. The mesh size of the gillnets is very effective at selecting or regulating the size of fish caught. The drift net has a low fuel/fish energy consumption compared to other fishing gear.
Below the mesh netting of a fog fence, there is a small trough for the water to be collected in. The water runs from the trough to some type of storage container or irrigation system for use. If the fog collector is circular the water will be deposited into a basin placed at the bottom of the netting. [6]
The inventors of ferrocement are Frenchmen Joseph Monier who dubbed it "ciment armé" (armored cement) and Joseph-Louis Lambot who constructed a boat with the system in 1848. [7] Lambot exhibited the vessel at the Exposition Universelle in 1855 and his name for the material "ferciment" stuck. Lambot patented his boat in 1855 but the patent was ...
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Bottom trawling is trawling (towing a trawl, which is a fishing net) along the seafloor. It is also referred to as "dragging". The scientific community divides bottom trawling into benthic trawling and demersal trawling. Benthic trawling is towing a net at the very bottom of the ocean and demersal trawling is towing a net just above the benthic ...
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