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{{term|term=[[Activated sludge]]|content='''[[Activated sludge]]'''}}{{defn|defn=A type of wastewater treatment process for treatin ...'}}{{defn|defn=A generic name for a group of mathematical methods to model activated sludge systems.}} ...

...ast=Eschner|first=Kat|website=Smithsonian|access-date=2019-10-23}}</ref> [[musical notation]],<ref name=":0">{{Cite web|url=https://www.classicfm.com/discover ...by [[Leon Battista Alberti]] in 1450.<ref>Invention of the Meteorological Instruments, W.E. Knowles Middleton, Johns Hopkins Press, Baltimore, 1969</ref> ...