protective filter
51Laser safety — A typical laser warning symbol. Laser safety is safe design, use and implementation of lasers to minimize the risk of laser accidents, especially those involving eye injuries. Since even relatively small amounts of laser light can lead to… …
52Earthing system — In sulvent systems, an earthing system defines the electrical potential of the conductors relative to that of the Earth s conductive surface. The choice of earthing system has implications for the safety and electromagnetic compatibility of the… …
53Technical textiles — is the term given to textile products manufactured for non aesthetic purposes, where function is the primary criterion.It is a large and growing sector and supports a vast array of other industries.Technical textiles include textiles for… …
54dog — dogless, adj. doglike, adj. /dawg, dog/, n., v., dogged, dogging. n. 1. a domesticated canid, Canis familiaris, bred in many varieties. 2. any carnivore of the dogfamily Canidae, having prominent canine teeth and, in the wild state, a long and… …
55gastropod — /gas treuh pod /, n. 1. any mollusk of the class Gastropoda, comprising the snails, whelks, slugs, etc. adj. 2. Also, gastropodous /ga strop euh deuhs/. belonging or pertaining to the gastropods. [1820 30; < NL Gast(e)ropoda a class of mollusks.… …
56Social behaviour in animals — Introduction actions of animals living in communities. Such behaviour may include the feeding of the young, the building of shelters, or the guarding of territory. General characteristics Social behaviour (Social behaviour in animals) …
57Welding — is a fabrication process that joins materials, usually metals or thermoplastics, by causing coalescence. This is often done by melting the workpieces and adding a filler material to form a pool of molten material (the weld puddle ) that cools to… …
58M9 Armored Combat Earthmover — Infobox Weapon name=M9 ACE (Armored Combat Earthmover) caption=Two M9 ACEs staged ready to go out on a mission in Iraq. origin=USA type= is vehicle=yes crew=1 length= 6.2 m width= 3.2 m height= 3 m weight= 24.4 tonnes armour= mm primary armament …
59Diversity of fish — Fish come in many shapes and sizes. This is a sea dragon, a close relative of the seahorse. They are camouflaged to look like floating seaweed.[1][2][3] …
60Coffee — This article is about the beverage. For the bean it is made from, see Coffee bean. For other uses, see Coffee (disambiguation). Coffee A cup of black coffee Type Hot Country of origin …
