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  2. Sunglass Hut - Wikipedia

    en.wikipedia.org/wiki/Sunglass_Hut

    sunglasshut .com. Sunglass Hut is an international retailer of sunglasses and sunglass accessories founded in Miami, Florida, United States, in 1971. Sunglass Hut is part of the Italian-based Luxottica Group, the world’s largest eyewear company. As of December 31, 2008, the Luxottica Group operated 2,286 stores around the world, most of those ...

  3. Luxottica - Wikipedia

    en.wikipedia.org/wiki/Luxottica

    Luxottica. Luxottica Group S.p.A. is an Italian eyewear conglomerate based in Milan. As a vertically integrated company, Luxottica designs, manufactures, distributes, and retails its eyewear brands all through its own subsidiaries. The company, presently organized as a subsidiary of EssilorLuxottica which formed when the Italian conglomerate ...

  4. Sunglasses - Wikipedia

    en.wikipedia.org/wiki/Sunglasses

    Hunter S. Thompson was known for wearing yellow-tinted driving glasses. When driving a vehicle, particularly at high speed, dazzling glare caused by a low Sun, or by lights reflecting off snow, puddles, other vehicles, or even the front of the vehicle, can be lethal. Sunglasses can protect against glare when driving.

  5. EssilorLuxottica - Wikipedia

    en.wikipedia.org/wiki/EssilorLuxottica

    EssilorLuxottica SA is an Italian-French vertically integrated multinational corporation based in Paris and founded on 1 October 2018 from the merger of the Italian Luxottica with the French Essilor. The eyewear -focused group designs, produces and markets ophthalmic lenses, optical equipment, prescription glasses and sunglasses .

  6. Proportional control - Wikipedia

    en.wikipedia.org/wiki/Proportional_control

    Proportional control, in engineering and process control, is a type of linear feedback control system in which a correction is applied to the controlled variable, and the size of the correction is proportional to the difference between the desired value ( setpoint, SP) and the measured value ( process variable, PV).

  7. Positive feedback - Wikipedia

    en.wikipedia.org/wiki/Positive_feedback

    A basic feedback system can be represented by this block diagram. In the diagram the + symbol is an adder and A and B are arbitrary causal functions. A simple feedback loop is shown in the diagram. If the loop gain AB is positive, then a condition of positive or regenerative feedback exists.

  8. Pinhole glasses - Wikipedia

    en.wikipedia.org/wiki/Pinhole_glasses

    Pinhole glasses, also known as stenopeic glasses, are eyeglasses with a series of pinhole-sized perforations filling an opaque sheet of plastic in place of each lens. Similar to the workings of a pinhole camera, each perforation allows only a very narrow beam of light to enter the eye which reduces the size of the circle of confusion on the ...

  9. Barnes–Hut simulation - Wikipedia

    en.wikipedia.org/wiki/Barnes–Hut_simulation

    Barnes–Hut simulation. A 100-body simulation with the Barnes–Hut tree visually as blue boxes. The Barnes–Hut simulation (named after Josh Barnes and Piet Hut) is an approximation algorithm for performing an n -body simulation. It is notable for having order O ( n log n) compared to a direct-sum algorithm which would be O ( n2 ).

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