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  2. Aluminium oxynitride - Wikipedia

    en.wikipedia.org/wiki/Aluminium_oxynitride

    Aluminium oxynitride is the hardest polycrystalline transparent ceramic available commercially. [ 2 ] [ needs update ] Because of its relatively low weight, distinctive optical and mechanical properties, and resistance to oxidation or radiation, it shows promise for applications such as bulletproof , blast-resistant, and optoelectronic windows ...

  3. Schlieren imaging - Wikipedia

    en.wikipedia.org/wiki/Schlieren_imaging

    Schlieren imaging is a method to visualize density variations in transparent media. [1]Schlieren imaging of a focusing ultrasonic transducer Schlieren image sequence of a bullet traveling in free-flight, demonstrating the air pressure dynamics surrounding the bullet

  4. Bulletproof glass - Wikipedia

    en.wikipedia.org/wiki/Bulletproof_glass

    Bulletproof glass of a jeweler's window after a burglary attempt. The Mona Lisa behind bulletproof glass at the Louvre Museum. Bulletproof glass, ballistic glass, transparent armor, or bullet-resistant glass is a strong and optically transparent material that is particularly resistant to penetration by projectiles, although, like any other material, it is not completely impenetrable.

  5. Polymer-cased ammunition - Wikipedia

    en.wikipedia.org/wiki/Polymer-cased_ammunition

    A 12-gauge shotgun shell in a transparent plastic hull, allowing the contents to be seen. Polymer-cased ammunition (PCA) is firearm ammunition with casings made from synthetic polymer instead of the typical metallic casing. PCA is considered a new alternative that potentially reduces production cost and weight for long guns and handguns.

  6. Shadowgraph - Wikipedia

    en.wikipedia.org/wiki/Shadowgraph

    A shadowgram is not a focused image, rather it is a mere shadow. In the shadowgram, the differences in light intensity are proportional to the second spatial derivative of the refractive index field in the transparent medium under study. Once the distance from the transparent disturbance to the cast shadow becomes too large, then the shadow no ...

  7. Cryptic Words “Left” By Gunman On Bullets That Took ... - AOL

    www.aol.com/unitedhealthcare-ceo-brian-thompson...

    Investigators are analyzing new key evidence in the fatal shooting of UnitedHealthcare CEO Brian Thompson. The 50-year-old was gunned to death outside the Hilton Hotel in Midtown Manhattan, New ...

  8. Transparent ceramics - Wikipedia

    en.wikipedia.org/wiki/Transparent_ceramics

    Transparent armor is a material or system of materials designed to be optically transparent, yet protect from fragmentation or ballistic impacts. The primary requirement for a transparent armor system is to not only defeat the designated threat but also provide a multi-hit capability with minimized distortion of surrounding areas.

  9. These are the pedophile symbols you need to know to protect ...

    www.aol.com/news/2016-04-26-these-are-the...

    Click through the see images of the symbols: Show comments. Advertisement. Advertisement. Holiday Shopping Guides. See all. AOL.

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