The point was to show that there was little difference between using a linear function for modeling thermal emission and a function which varies as the fourth power of the temperature. (rabett.blogspot.ru)
Lab engineers have added diagnostics and high - speed cameras to examine thermal emissions and to image the surface of parts as they're being built. (llnl.gov)
Since 1979, 14 satellite instruments have daily been recording global temperatures throughout different layers of the atmosphere by monitoring thermal emissions. (thenewamerican.com)