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  2. Onion model - Wikipedia

    en.wikipedia.org/wiki/Onion_model

    A template for an onion diagram. An onion diagram is a kind of chart that shows the dependencies among parts of an organization or process. The chart displays items in concentric circles, where the items in each ring depend on the items in the smaller rings. [1] The onion diagram is able to show layers of a complete system in a few circles.

  3. Internal structure of Earth - Wikipedia

    en.wikipedia.org/wiki/Internal_structure_of_Earth

    Earth's inner core is the innermost geologic layer of the planet Earth. It is primarily a solid ball with a radius of about 1,220 km (760 mi), which is about 19% of Earth's radius [0.7% of volume] or 70% of the Moon 's radius. [32][33] The inner core was discovered in 1936 by Inge Lehmann and is generally composed primarily of iron and some nickel.

  4. Circle packing - Wikipedia

    en.wikipedia.org/wiki/Circle_packing

    In geometry, circle packing is the study of the arrangement of circles (of equal or varying sizes) on a given surface such that no overlapping occurs and so that no circle can be enlarged without creating an overlap. The associated packing density, η, of an arrangement is the proportion of the surface covered by the circles.

  5. Bhavacakra - Wikipedia

    en.wikipedia.org/wiki/Bhavacakra

    The second layer of the wheel shows two-half circles: One half-circle (usually light) shows contented people moving upwards to higher states, possibly to the higher realms. The other half-circle (usually dark) shows people in a miserable state being led downwards to lower states, possibly to the lower realms.

  6. Sphere packing - Wikipedia

    en.wikipedia.org/wiki/Sphere_packing

    Sphere packing finds practical application in the stacking of cannonballs. In geometry, a sphere packing is an arrangement of non-overlapping spheres within a containing space. The spheres considered are usually all of identical size, and the space is usually three- dimensional Euclidean space. However, sphere packing problems can be ...

  7. Moiré pattern - Wikipedia

    en.wikipedia.org/wiki/Moiré_pattern

    Line moiré is one type of moiré pattern; a pattern that appears when superposing two transparent layers containing correlated opaque patterns. Line moiré is the case when the superposed patterns comprise straight or curved lines. When moving the layer patterns, the moiré patterns transform or move at a faster speed.

  8. Open Artwork System Interchange Standard - Wikipedia

    en.wikipedia.org/wiki/Open_Artwork_System...

    SEMI SEMI P39 - Specification for OASIS (P39-0416) Open Artwork System Interchange Standard (OASIS[3]) is a binary file format used for specification of data structures for photomask production. [4] It's used to represent a pattern an interchange and encapsulation format for hierarchical integrated circuit mask layout information produced ...

  9. Patterned ground - Wikipedia

    en.wikipedia.org/wiki/Patterned_ground

    Through time, repeated freeze-thaw cycles smooth out irregularities and odd-shaped piles to form the common polygons, circles, and stripes of patterned ground. [17] Patterned ground occurs in alpine areas with freeze thaw cycles. For example, on Mount Kenya seasonal frost layer is a few centimetres (inches) below the surface in places. [1]