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November 5, 2025: The United States retired the last of its E-3 AWACS/Airborne Warning and Control System in 2023. The Air Force initially wanted to replace the four-engine E-3 AWACS with the ...

Abstract: Motivated by the proportional integral (PI) control theory of deterministic systems, this paper aims to establish the PI-type control theory for stochastic systems, including the standard PI ...

Bird diagram from the 1886 'A nomenclature of colors for naturalists : and compendium of useful knowledge for ornithologists' by Robert Ridgway (via Smithsonian Libraries) Colors in the 1912 'Color ...