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Zone refining

a process of purifying any of various metals and other materials, as germanium or silicon, by passing it in bar form through an induction coil.
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 passed along the solid. Impurities concentrate in the melt and are moved to the end of the bar


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  • 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 […]

  • Zone time

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    . zone of leaching See A horizon.

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