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  2. Floor and ceiling functions - Wikipedia

    en.wikipedia.org/wiki/Floor_and_ceiling_functions

    Given real numbers x and y, integers m and n and the set of integers, floor and ceiling may be defined by the equations ⌊ ⌋ = {}, ⌈ ⌉ = {}. Since there is exactly one integer in a half-open interval of length one, for any real number x, there are unique integers m and n satisfying the equation

  3. USG Corporation - Wikipedia

    en.wikipedia.org/wiki/USG_Corporation

    USG Corporation, also known as United States Gypsum Corporation, is an American company which manufactures construction materials, most notably drywall and joint compound. The company is the largest distributor of wallboard in the United States and the largest manufacturer of gypsum products in North America.

  4. Sound transmission class - Wikipedia

    en.wikipedia.org/wiki/Sound_transmission_class

    In the US, it is widely used to rate interior partitions, ceilings, floors, doors, windows and exterior wall configurations. Outside the US, the ISO Sound Reduction Index (SRI) is used. The STC rating very roughly reflects the decibel reduction of noise that a partition can provide. The STC is useful for evaluating annoyance due to speech ...

  5. Point of total assumption - Wikipedia

    en.wikipedia.org/wiki/Point_of_total_assumption

    Calculation of Point of Total assumption (the case when EAC exceeds PTA that should be treated as a risk trigger, is shown) The point of total assumption (PTA) is a point on the cost line of the profit-cost curve determined by the contract elements associated with a fixed price plus incentive-Firm Target (FPI) contract above which the seller effectively bears all the costs of a cost overrun.

  6. Category:Mathematical notation - Wikipedia

    en.wikipedia.org/wiki/Category:Mathematical_notation

    Floor and ceiling functions; Formula; Formula calculator; Free variables and bound variables; G. Galactic algorithm; Gardner–Salinas braille codes; Gauss notation;

  7. Ceiling (aeronautics) - Wikipedia

    en.wikipedia.org/wiki/Ceiling_(aeronautics)

    The service ceiling is the maximum altitude of an aircraft during normal operations. Specifically, it is the density altitude at which flying in a clean configuration , at the best rate of climb airspeed for that altitude and with all engines operating and producing maximum continuous power, will produce a given rate of climb.

  8. Drywall - Wikipedia

    en.wikipedia.org/wiki/Drywall

    Various sized cuts of 1 ⁄ 2 in (13 mm) drywall with tools for maintenance and installation . Drywall (also called plasterboard, dry lining, [1] wallboard, sheet rock, gib board, gypsum board, buster board, turtles board, slap board, custard board, gypsum panel and gyprock) is a panel made of calcium sulfate dihydrate (), with or without additives, typically extruded between thick sheets of ...

  9. Floor effect - Wikipedia

    en.wikipedia.org/wiki/Floor_effect

    The "floor effect" is one type of scale attenuation effect; [3] the other scale attenuation effect is the "ceiling effect". Floor effects are occasionally encountered in psychological testing , when a test designed to estimate some psychological trait has a minimum standard score that may not distinguish some test-takers who differ in their ...