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Category Scope 44 Energy Production and Conversion Includes specific energy conversion systems, e.g., fuel cells; and solar, geothermal, windpower, and waterwave conversion systems; energy storage; and traditional power generators. For technologies related to nuclear energy production see 73 Nuclear Physics. For related information see also 07 Aircraft Propulsion and Power; 20 Spacecraft Propulsion and Power; and 28 Propellants and Fuels. Definition Energy Production – The production of electricity, combustible fuels, nuclear and thermonuclear fuels, and heating and cooling by renewable resources. Energy Conversion – The change of a working substance or natural power into a more useable form of energy such as electricity or mechanical motion. NASA Thesaurus, Washington, DC: National Aeronautics and Space Administration. NASA Interest Exhaustive Interest : Techniques, equipment, and systems that may provide power or fuel for aircraft, space vehicles, launch vehicles, satellites, orbital stations, extraterrestrial bases. Selective Interest : Earth based energy production and conversion, energy for transportation, and new developments in energy technology (new sources, high efficiency units, etc.); lightweight, low cost power units with potential for aerospace application. Negative Interest : Solar, wind, nuclear and hydroelectric power plants for routine commercial applications; coal energy conversion. | Input Subjects of Specific Interest
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