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  2. Repeating decimal - Wikipedia

    en.wikipedia.org/wiki/Repeating_decimal

    Conversely the period of the repeating decimal of a fraction ⁠ c / d ⁠ will be (at most) the smallest number n such that 10 n − 1 is divisible by d. For example, the fraction ⁠ 2 / 7 ⁠ has d = 7, and the smallest k that makes 10 k − 1 divisible by 7 is k = 6, because 999999 = 7 × 142857. The period of the fraction ⁠ 2 / 7 ⁠ is ...

  3. 1:35 scale - Wikipedia

    en.wikipedia.org/wiki/1:35_scale

    A 1:35 scale Learjet 45. 1:35 scale is the most popular scale for model military vehicles, with an extensive lineup of models and aftermarket parts available from a wide variety of manufacturers.

  4. ∆ - Wikipedia

    en.wikipedia.org/wiki/%E2%88%86

    ∆ may refer to: . Triangle (∆), one of the basic shapes in geometry. Many different mathematical equations include the use of the triangle.; Delta (letter) (Δ), a Greek letter also used in mathematics and computer science

  5. Channelling (physics) - Wikipedia

    en.wikipedia.org/wiki/Channelling_(physics)

    Therefore, is an estimation of the smallest fraction of de-channeled ions that can be obtained from a material perfectly aligned to the ion beam. By considering a single crystal of silicon , oriented along the <110>, a χ m i n = 1.35 10 − 2 {\displaystyle \chi _{\rm {min}}=1.35~10^{-2}} can be calculated, in good agreement with the ...

  6. Image sensor format - Wikipedia

    en.wikipedia.org/wiki/Image_sensor_format

    Sizes are often expressed as a fraction of an inch, with a one in the numerator, and a decimal number in the denominator. For example, 1/2.5 converts to 2/5 as a simple fraction, or 0.4 as a decimal number. This "inch" system gives a result approximately 1.5 times the length of the diagonal of the sensor.

  7. Academy ratio - Wikipedia

    en.wikipedia.org/wiki/Academy_ratio

    Academy ratio 1.375:1. The Academy ratio of 1.375:1 (abbreviated as 1.37:1) is an aspect ratio of a frame of 35 mm film when used with 4-perf pulldown. [1] [2] It was standardized by the Academy of Motion Picture Arts and Sciences as the standard film aspect ratio in 1932, although similar-sized ratios were used as early as 1928.

  8. Composite material - Wikipedia

    en.wikipedia.org/wiki/Composite_material

    The crystalline portion has a higher elastic modulus and provides reinforcement for the less stiff, amorphous phase. Polymeric materials can range from 0% to 100% [52] crystallinity aka volume fraction depending on molecular structure and thermal history. Different processing techniques can be employed to vary the percent crystallinity in these ...

  9. Zone melting - Wikipedia

    en.wikipedia.org/wiki/Zone_melting

    Zone melting (or zone refining, or floating-zone method, or floating-zone technique) is a group of similar methods of purifying crystals, in which a narrow region of a crystal is melted, and this molten zone is moved along the crystal.