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  2. S-75 Dvina - Wikipedia

    en.wikipedia.org/wiki/S-75_Dvina

    The S-75 (Russian: С-75; NATO reporting name SA-2 Guideline) is a Soviet-designed, high-altitude air defence system. It is built around a surface-to-air missile with command guidance . Following its first deployment in 1957 it became one of the most widely deployed air defence systems in history.

  3. Surface roughness - Wikipedia

    en.wikipedia.org/wiki/Surface_roughness

    Areal roughness parameters are defined in the ISO 25178 series. The resulting values are Sa, Sq, Sz,... Many optical measurement instruments are able to measure the surface roughness over an area. Area measurements are also possible with contact measurement systems. Multiple, closely spaced 2D scans are taken of the target area.

  4. List of NATO reporting names for surface-to-air missiles

    en.wikipedia.org/wiki/List_of_NATO_reporting...

    NATO reporting name corresponding to US DoD SA series surface-to-air missiles, with Soviet designations or Chinese designations: To differentiate Russian missiles from similarly named Chinese ones, RS prefix was added to the US DoD reporting name.

  5. S-350 missile system - Wikipedia

    en.wikipedia.org/wiki/S-350_missile_system

    The S-350 Vityaz (Russian: C-350 Витязь) is a Russian medium-range surface-to-air missile system developed by GSKB Almaz-Antey. Its purpose is to replace the S-300PS. [5] The system design traces its roots from the joint South Korean-Russian KM-SAM project and uses the same 9M96 missile as the S-400 missile system.

  6. Spectral acceleration - Wikipedia

    en.wikipedia.org/wiki/Spectral_acceleration

    Ground motion hazard map for Hawaii, based on a 2% probability of exceeding 0.2 second spectral acceleration at 5 Hz in 50 years. Spectral acceleration (SA) is a unit measured in g (the acceleration due to Earth's gravity, equivalent to g-force) that describes the maximum acceleration in an earthquake on an object – specifically a damped, harmonic oscillator moving in one physical dimension.

  7. 9K38 Igla - Wikipedia

    en.wikipedia.org/wiki/9K38_Igla

    The 9K38 Igla (Russian: Игла́, "needle", NATO reporting name SA-18 Grouse) is a Soviet/Russian man-portable infrared homing surface-to-air missile (SAM) system. A simplified, earlier version is known as the 9K310 Igla-1 (NATO: SA-16 Gimlet ), and the latest variant is the 9K338 Igla-S ( SA-24 Grinch ).

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