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  2. Altimeter setting - Wikipedia

    en.wikipedia.org/wiki/Altimeter_setting

    It is designed to read zero at sea level in the vicinity of the aerodrome, unlike QNH which will not read precisely zero at sea-level. [2] Related to the altimeter settings are: TA [3] - Transition Altitude - altitude at which the pilot changes the aircraft's altimeter setting (usually from QNH) to standard pressure (1013.25 hPa)

  3. Quantitative phase-contrast microscopy - Wikipedia

    en.wikipedia.org/wiki/Quantitative_phase...

    Quantitative phase contrast microscopy or quantitative phase imaging are the collective names for a group of microscopy methods that quantify the phase shift that occurs when light waves pass through a more optically dense object. [1] [2] Translucent objects, like a living human cell, absorb and scatter small amounts of light.

  4. Altitude - Wikipedia

    en.wikipedia.org/wiki/Altitude

    When flying at a flight level, the altimeter is always set to standard pressure (29.92 inHg or 1013.25 hPa). On the flight deck, the definitive instrument for measuring altitude is the pressure altimeter, which is an aneroid barometer with a front face indicating distance (feet or metres) instead of atmospheric pressure.

  5. Phase-contrast imaging - Wikipedia

    en.wikipedia.org/wiki/Phase-contrast_imaging

    The changes in the light passage result in waves being 'out of phase' with others. This effect can be transformed by phase contrast microscopes into amplitude differences that are observable in the eyepieces and are depicted effectively as darker or brighter areas of the resultant image. [citation needed]

  6. Phase-contrast microscopy - Wikipedia

    en.wikipedia.org/wiki/Phase-contrast_microscopy

    In its positive form, the background light is instead phase-shifted by +90°. The background light will thus be 180° out of phase relative to the scattered light. The scattered light will then be subtracted from the background light to form an image with a darker foreground and a lighter background, as shown in the first figure. [5] [6] [7]

  7. Comparison microscope - Wikipedia

    en.wikipedia.org/wiki/Comparison_microscope

    A comparison microscope is a device used to analyze side-by-side specimens. It consists of two microscopes connected by an optical bridge, which results in a split ...

  8. List of aviation, avionics, aerospace and aeronautical ...

    en.wikipedia.org/wiki/List_of_aviation,_avionics...

    Altimeter: ALT 3: Altitude: ALT hold Altitude hold mode ALTS Altitude select ALUM Aluminum AMC Acceptable Means of Compliance AME Aircraft Maintenance Engineer: AME Aviation Medical Examiner: AMLCD Active-matrix liquid-crystal display: AMM Aircraft Maintenance Manual AMO Approved Maintenance Organization AMS Air management system AMSL

  9. Optical microscope - Wikipedia

    en.wikipedia.org/wiki/Optical_microscope

    The optical microscope, also referred to as a light microscope, is a type of microscope that commonly uses visible light and a system of lenses to generate magnified images of small objects. Optical microscopes are the oldest design of microscope and were possibly invented in their present compound form in the 17th century.

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