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  2. Spacer patterning - Wikipedia

    en.wikipedia.org/wiki/Spacer_patterning

    Left: Spacer (blue) is deposited on mandrel (gray) and etched, leaving only the portion covering the sidewall. Center: Mandrel is removed. Right: Spacer is trimmed by etching to smaller width. Spacer patterning is a technique employed for patterning features with linewidths smaller than can be achieved by conventional lithography.

  3. Penrose tiling - Wikipedia

    en.wikipedia.org/wiki/Penrose_tiling

    Covering a flat surface ("the plane") with some pattern of geometric shapes ("tiles"), with no overlaps or gaps, is called a tiling. The most familiar tilings, such as covering a floor with squares meeting edge-to-edge, are examples of periodic tilings. If a square tiling is shifted by the width of a tile, parallel to the sides of the tile, the ...

  4. Shim (spacer) - Wikipedia

    en.wikipedia.org/wiki/Shim_(spacer)

    A shim is a thin and often tapered or wedged piece of material, used to fill small gaps or spaces between objects. [1] Shims are typically used in order to support, adjust for better fit, or provide a level surface. Shims may also be used as spacers to fill gaps between parts subject to wear.

  5. Rebar spacer - Wikipedia

    en.wikipedia.org/wiki/Rebar_spacer

    A concrete spacer with a plastic clip in use Concrete spacers in a precast element Diaphragm wall block on rebar for a Diaphragm wall. A rebar spacer is a short, rod-like device used to secure reinforcing steel bars, or rebar, within cast assemblies for reinforced concrete structures. The rebar spacers are fixed before the concrete is poured ...

  6. Squaring the square - Wikipedia

    en.wikipedia.org/wiki/Squaring_the_square

    Smith diagram of a rectangle. A "perfect" squared square is a square such that each of the smaller squares has a different size. Perfect squared squares were studied by R. L. Brooks, C. A. B. Smith, A. H. Stone and W. T. Tutte (writing under the collective pseudonym "Blanche Descartes") at Cambridge University between 1936 and 1938.

  7. One-way mirror - Wikipedia

    en.wikipedia.org/wiki/One-way_mirror

    One-way mirrors for upper-level observation deck viewing down into a classroom (University of Wisconsin-Eau Claire) A one-way mirror, also called two-way mirror [1] (or one-way glass, half-silvered mirror, and semi-transparent mirror), is a reciprocal mirror that appears reflective from one side and transparent from the other. The perception of ...