Emissivity is defined as the ratio of the energy radiated from a material’s surface to that radiated from a black body (a perfect emitter of infrared radiation) at the same temperature and wavelength and under the same viewing conditions...
Once upon a time, there was a ship called the Hydra. They were suspicious that the gears or bearings in the main gearbox were failing and asked a vibration analyst to perform a test. The analyst turned to me for help...
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