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  2. Porro prism - Wikipedia

    en.wikipedia.org/wiki/Porro_prism

    Porro prisms are most often used in pairs, forming a double Porro prism. A second prism rotated 90° with respect to the first, is placed such that light will traverse both prisms. The net effect of the prism system is a beam parallel to but displaced from its original direction, with the image rotated 180°.

  3. Error analysis for the Global Positioning System - Wikipedia

    en.wikipedia.org/wiki/Error_analysis_for_the...

    Some military and expensive survey-grade civilian receivers calculate atmospheric dispersion from the different delays in the L1 and L2 frequencies, and apply a more precise correction. This can be done in civilian receivers without decrypting the P(Y) signal carried on L2, by tracking the carrier wave instead of the modulated code.

  4. Cost - Wikipedia

    en.wikipedia.org/wiki/Cost

    More generalized in the field of economics, cost is a metric that is totaling up as a result of a process or as a differential for the result of a decision. [1] Hence cost is the metric used in the standard modeling paradigm applied to economic processes. Costs (pl.) are often further described based on their timing or their applicability.

  5. Quantum error correction - Wikipedia

    en.wikipedia.org/wiki/Quantum_error_correction

    The error-correction demonstration was performed on Schrodinger-cat states encoded in a superconducting resonator, and employed a quantum controller capable of performing real-time feedback operations including read-out of the quantum information, its analysis, and the correction of its detected errors. The work demonstrated how the quantum ...

  6. Optical proximity correction - Wikipedia

    en.wikipedia.org/wiki/Optical_proximity_correction

    An illustration of OPC (Optical Proximity Correction). The blue Γ-like shape is what chip designers would like printed on a wafer, in green is the pattern on a mask after applying optical proximity correction, and the red contour is how the shape actually prints on the wafer (quite close to the desired blue target).

  7. Wedge prism - Wikipedia

    en.wikipedia.org/wiki/Wedge_prism

    Prism factor is based on the angle of the prism, and prisms are available in different factors, expressed in both square feet/acre (5, 10, 20 BAF are most common) and square meters/hectare (1-5 BAF are common). Prism size is chosen to yield a statistically valid estimate of basal area - 6-10 "in" trees per plot are required, which requires a ...

  8. UMPK (bomb kit) - Wikipedia

    en.wikipedia.org/wiki/UMPK_(bomb_kit)

    A unit costs 2 million rubles, according to the Fighterbomber Telegram channel, [14] which is equivalent to 24,460 USD [15] and is cheap for such a weapon. [ 14 ] [ 15 ] During its invasion of Ukraine, Russia is unlikely to run out of bombs to which it can be fitted, as it has a very large inventory of unguided aerial bombs . [ 15 ]

  9. Prentice position - Wikipedia

    en.wikipedia.org/wiki/Prentice_position

    The Prentice position. The Prentice position is an orientation of a prism, used in optics, optometry and ophthalmology. [1] In this position, named after the optician Charles F. Prentice, the prism is oriented such that light enters it at an angle of 90° to the first surface, so that the beam does not refract at that surface.

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