This site, from the American Physical Society, gives a brief description of a furnace at Kansas State University that is used in semiconductor research. An image shows heat radiation from the quartz liner in this furnace, which is part of silicon-doping experiments.
American Physical Society. Quartz Liner Tube Inside Tube Furnace. College Park: American Physical Society, September 8, 2008. http://www.aps.org/about/physics-images/archive/tube.cfm (accessed 28 July 2017).
%0 Electronic Source %D September 8, 2008 %T Quartz Liner Tube Inside Tube Furnace %I American Physical Society %V 2017 %N 28 July 2017 %8 September 8, 2008 %9 image/jpeg %U http://www.aps.org/about/physics-images/archive/tube.cfm
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