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  2. Geography of Illinois - Wikipedia

    en.wikipedia.org/wiki/Geography_of_Illinois

    The wealth of the state mainly arises from this abundance of soil and the favorable agrarian conditions it provides. Illinois is a major coal-producing state. Much of the bedrock surface is of Pennsylvanian age, including "cyclothemes", regular sequences of limestone, shale and coal layers. Newer rocks may have once existed in the State, but ...

  3. File:Illinois - outline map.svg - Wikipedia

    en.wikipedia.org/.../File:Illinois_-_outline_map.svg

    Outline map of the Illinois State, USA, ready for the Geobox template, ... Illinois - outline map c.svg with same license GFDL/CC-BY... 02:38, 31 May 2013: 768 × ...

  4. Three-surface aircraft - Wikipedia

    en.wikipedia.org/wiki/Three-surface_aircraft

    On many modern designs, the wing centre of pressure is normally aft of the centre of gravity, so the tailplane must exert a downward force. [17] Any such negative lift generated by the tail must be compensated by additional lift from the main wing, thus increasing wing area, drag, and weight requirements.

  5. File:Map of Illinois highlighting ISP Districts.svg - Wikipedia

    en.wikipedia.org/wiki/File:Map_of_Illinois...

    This is a map highlighting Illinois State Police Districts. Modification of David Benbennick 's map. For more information, see Commons:United States county locator maps .

  6. Outline of Illinois - Wikipedia

    en.wikipedia.org/wiki/Outline_of_Illinois

    An enlargeable map of the state of Illinois. Names Common name: Illinois. Pronunciation: / ˌ ɪ l ɪ ˈ n ɔɪ / ⓘ IL-i-NOY; Official name: State of Illinois; Abbreviations and name codes Postal symbol: IL; ISO 3166-2 code: US-IL; Internet second-level domain: .il.us; Nicknames Land of Lincoln [1] (currently used on license plates) Prairie ...

  7. Center of pressure (fluid mechanics) - Wikipedia

    en.wikipedia.org/wiki/Center_of_pressure_(fluid...

    The total force vector acting at the center of pressure is the surface integral of the pressure vector field across the surface of the body. The resultant force and center of pressure location produce an equivalent force and moment on the body as the original pressure field. Pressure fields occur in both static and dynamic fluid mechanics ...

  8. Office of the Illinois State Fire Marshal - Wikipedia

    en.wikipedia.org/wiki/Office_of_the_Illinois...

    The Office is the regulatory agency of record, for Illinois, in the safety inspection of a wide variety of boilers, pressure vessels, and tanks that contain or can be filled with flammable or heated materials. The Office is the regulatory agency of record in the professional qualification and licensure of Illinois elevator contractors. [1]

  9. Joukowsky transform - Wikipedia

    en.wikipedia.org/wiki/Joukowsky_transform

    This can be achieved for any allowable centre position + by varying the radius of the circle. Joukowsky airfoils have a cusp at their trailing edge . A closely related conformal mapping, the Kármán–Trefftz transform , generates the broader class of Kármán–Trefftz airfoils by controlling the trailing edge angle.