aluminum resist method
81Photo chemical machining — Photochemical machining (PCM) is a method of fabricating metal components using reactive etchants to corrosively oxidize selected areas of metal. Also known as photo etching or chemical etching, this process emerged in the 1960s as an offshoot of …
82environment — environmental, adj. environmentally, adv. /en vuy reuhn meuhnt, vuy euhrn /, n. 1. the aggregate of surrounding things, conditions, or influences; surroundings; milieu. 2. Ecol. the air, water, minerals, organisms, and all other external factors… …
83Calendar of 1998 — ▪ 1999 January January 1 At the stroke of the new year, the Russian ruble is worth a thousand times less than before as three zeros are removed from its value; about six new rubles equal one U.S. dollar. Foreign Minister David Levy… …
84plant disease — ▪ plant pathology Introduction an impairment of the normal state of a plant that interrupts or modifies its vital functions. All species of plants, wild and cultivated alike, are subject to disease. Although each species is… …
85Alloy — This article is about the type of material. For the specification language, see Alloy (specification language). For lightweight auto wheels, see alloy wheel. Steel is a metal alloy whose major component is iron, with carbon content between 0.02%… …
86Diamond — This article is about the mineral. For the gemstone, see Diamond (gemstone). For other uses, including the shape ◊, see Diamond (disambiguation) …
87Tilt up — or tilt slab is a type of building, and a construction technique using concrete. The process resembles barn raising specifically and wood platform framing generally. It is cost effective for low buildings.cite journal | last=Glass | first=J. |… …
88Workbench (woodworking) — A Workbench is a table used by woodworkers to hold workpieces while they are worked by other tools. There are many styles of woodworking benches, each reflecting the type of work to be done or the craftsman s way of working. Most benches have two …
89Hard disk drive — Hard drive redirects here. For other uses, see Hard drive (disambiguation). Hard disk drive Mechanical interior of a modern hard disk drive Date invented 24 December 1954 [1] …
90Ocean thermal energy conversion — Temperature differences between the surface and 1000m depth in the oceans Ocean Thermal Energy Conversion (OTEC) uses the difference between cooler deep and warmer shallow or surface ocean waters to run a heat engine and produce useful work,… …
