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  2. NIOSH air filtration rating - Wikipedia

    en.wikipedia.org/wiki/NIOSH_air_filtration_rating

    For R type filters, a 200 mg of DOP is used, with a defined service time of "one work shift". For P type filters, an indefinite amount of DOP is used until filtration efficiency stabilizes. P100 filters, under 42 CFR part 84, are the only filters permitted to be magenta in color. [21]

  3. Timex Sinclair 2068 - Wikipedia

    en.wikipedia.org/wiki/Timex_Sinclair_2068

    Following Timex's ZX81-based T/S 1000 and T/S 1500, a new series of ZX Spectrum-based machines was created.Initially named T/S 2000 (as reflected on the user manual [1]), the machine evolved into the T/S 2048 prototype, and was eventually released as T/S 2068, with the name chosen mainly for marketing reasons.

  4. Thinsulate - Wikipedia

    en.wikipedia.org/wiki/Thinsulate

    The word is a portmanteau of the words thin and insulate, trademarked by 3M. [1] The material is made by the 3M Corporation and was first sold in 1979. [ 2 ] It was originally marketed as an inexpensive alternative to down; at the time, 3M claimed it was twice as warm as an equivalent amount of any natural material.

  5. List of polygons - Wikipedia

    en.wikipedia.org/wiki/List_of_polygons

    A pentagon is a five-sided polygon. A regular pentagon has 5 equal edges and 5 equal angles. ... 200 000: icosakismyriagon icosamyriagon 300 000: triacontakismyriagon

  6. Rich black - Wikipedia

    en.wikipedia.org/wiki/Rich_black

    Wetness is not a problem with laser printers, however, and registration black (or "400% black") produces very striking results in laser prints. [5] Rich black is often regarded as a color that is "blacker than black". While this is impossible from the point of view of color theory, the difference can often be seen in the printed piece. The ...

  7. APHA color - Wikipedia

    en.wikipedia.org/wiki/APHA_color

    APHA color, also referred to as the Hazen scale, and more appropriately as the Platinum Cobalt(Pt/Co) scale, [1] is a color standard named for the American Public Health Association and defined by ASTM D1209. [2] It was originally intended to describe the color of waste water, but its usage has expanded to include other industrial applications ...

  8. Buckminsterfullerene - Wikipedia

    en.wikipedia.org/wiki/Buckminsterfullerene

    Buckminsterfullerene is a truncated icosahedron with 60 vertices, 32 faces (20 hexagons and 12 pentagons where no pentagons share a vertex), and 90 edges (60 edges between 5-membered & 6-membered rings and 30 edges are shared between 6-membered & 6-membered rings), with a carbon atom at the vertices of each polygon and a bond along each polygon ...

  9. Heightmap - Wikipedia

    en.wikipedia.org/wiki/Heightmap

    One may also exploit the use of individual color channels to increase detail. For example, a standard RGB 8-bit image can only show 256 values of grey and hence only 256 heights. By using colors, a greater number of heights can be stored (for a 24-bit image, 256 3 = 16,777,216 heights can be represented (256 4 = 4,294,967,296 if the alpha ...

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