Zone refining
a process of purifying any of various metals and other materials, as germanium or silicon, by p-ssing it in bar form through an induction coil.
noun
a technique for producing solids of extreme purity, esp for use in semiconductors. the material, in the form of a bar, is melted in one small region that is p-ssed along the solid. impurities concentrate in the melt and are moved to the end of the bar
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zone something out noun (also zoner) a person intoxicated with narcotics, esp habitually so; sp-ce cadet (1960s+ narcotics) verb to be inattentive; be hazily preoccupied: he zoned so bad he didn’t even hear the teacher call his name/ i was kind of zonin’, checking things out (1980s+) [fr ozone, ”a very high level of the […]
- Zone system
a system for envisioning the values to appear in a black-and-white print and for determining exposure and development, based on a scale of shades ranging from 0 (black) to ix (white). historical examples when the introduction of the zone system was first advocated in hungary it was opposed by just such men and just such […]
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standard time as applied at sea, reckoned according to the system of time zones.
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. zone of leaching see a horizon.
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any continuous tract or area that differs in some respect, or is distinguished for some purpose, from adjoining tracts or areas, or within which certain distinctive circ-mstances exist or are established. geography. any of five great divisions of the earth’s surface, bounded by lines parallel to the equator and named according to the prevailing temperature. […]