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  2. Negative refraction - Wikipedia

    en.wikipedia.org/wiki/Negative_refraction

    Negative refraction. Negative refraction is the electromagnetic phenomenon where light rays become refracted at an interface that is opposite to their more commonly observed positive refractive properties. Negative refraction can be obtained by using a metamaterial which has been designed to achieve a negative value for (electric) permittivity ...

  3. Dan (rank) - Wikipedia

    en.wikipedia.org/wiki/Dan_(rank)

    Women professionals are ranked from 3-kyū to 6-dan and it is commonly believed that even the strongest women professionals are generally only equivalent in playing strength to shōreikai 1- or 2-dan ranked players. [8] In fact, no woman professional has ever successfully completed the shōreikai system and been awarded the rank of 4-dan.

  4. Partial charge - Wikipedia

    en.wikipedia.org/wiki/Partial_charge

    Partial charge. In atomic physics, a partial charge (or net atomic charge) is a non- integer charge value when measured in elementary charge units. It is represented by the Greek lowercase delta (𝛿), namely 𝛿− or 𝛿+. Partial charges are created due to the asymmetric distribution of electrons in chemical bonds.

  5. 74 knot - Wikipedia

    en.wikipedia.org/wiki/74_knot

    alternating, hyperbolic, prime, reversible, tricolorable. In mathematical knot theory, 74 is the name of a 7-crossing knot which can be visually depicted in a highly-symmetric form, and so appears in the symbolism and/or artistic ornamentation of various cultures.

  6. Go ranks and ratings - Wikipedia

    en.wikipedia.org/wiki/Go_ranks_and_ratings

    Professional dan ranks go up to 9th dan, but the strength difference between a 1st dan and a 9th dan professional is generally no more than 2–3 handicap stones. To distinguish between professional dan and amateur dan ranks, the former is often abbreviated to "p" (sometimes called ping ) and the latter to "d".

  7. Surface charge - Wikipedia

    en.wikipedia.org/wiki/Surface_charge

    A surface charge is an electric charge present on a two-dimensional surface. These electric charges are constrained on this 2-D surface, and surface charge density, measured in coulombs per square meter (C•m −2 ), is used to describe the charge distribution on the surface. The electric potential is continuous across a surface charge and the ...

  8. Chrysler PowerTech engine - Wikipedia

    en.wikipedia.org/wiki/Chrysler_PowerTech_engine

    Chrysler PowerTech 3.7 L V6 in a 2005 Jeep Grand Cherokee. The EKG is a 3.7 L V6 version built in Detroit, Michigan. It displaces 3.7 L; 225.8 cu in (3,701 cc). [4] The bore and stroke measure 3.66 in × 3.57 in (93.0 mm × 90.7 mm). It is a 90° V engine like the V8, with SOHC 2-valve heads. It utilizes a counter-rotating balance shaft mounted ...

  9. Five whys - Wikipedia

    en.wikipedia.org/wiki/Five_whys

    Five whys (or 5 whys) is an iterative interrogative technique used to explore the cause-and-effect relationships underlying a particular problem. [1] The primary goal of the technique is to determine the root cause of a defect or problem by repeating the question "why?" five times, each time directing the current "why" to the answer of the ...