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  2. List of virtual reality headsets - Wikipedia

    en.wikipedia.org/wiki/List_of_virtual_reality...

    Standalone – devices that have all necessary components to provide virtual reality experiences integrated into the headset. Mainstream standalone VR platforms include: Oculus Mobile SDK, developed by Oculus VR for its own standalone headsets and the Samsung Gear VR. (The SDK has been deprecated in favor of OpenXR, released in July 2021.)

  3. Virtual reality - Wikipedia

    en.wikipedia.org/wiki/Virtual_reality

    An operator controlling The Virtual Interface Environment Workstation (VIEW) [ 1 ] at NASA Ames around 1990. Virtual reality (VR) is a simulated experience that employs 3D near-eye displays and pose tracking to give the user an immersive feel of a virtual world. Applications of virtual reality include entertainment (particularly video games ...

  4. Virtual reality sickness - Wikipedia

    en.wikipedia.org/wiki/Virtual_reality_sickness

    Virtual reality sickness may have undesirable consequences beyond the sickness itself. For example, Crowley (1987) argued that flight simulator sickness could discourage pilots from using flight simulators, reduce the efficiency of training through distraction and the encouragement of adaptive behaviors that are unfavorable for performance, compromise ground safety or flight safety when sick ...

  5. Cutoff frequency - Wikipedia

    en.wikipedia.org/wiki/Cutoff_frequency

    The cutoff frequency is the critical frequency between propagation and attenuation, which corresponds to the frequency at which the longitudinal wavenumber is zero. It is given by The wave equations are also valid below the cutoff frequency, where the longitudinal wave number is imaginary. In this case, the field decays exponentially along the ...

  6. Significant wave height - Wikipedia

    en.wikipedia.org/wiki/Significant_wave_height

    Significant wave height H 1/3, or H s or H sig, as determined in the time domain, directly from the time series of the surface elevation, is defined as the average height of that one-third of the N measured waves having the greatest heights: [5] / = = where H m represents the individual wave heights, sorted into descending order of height as m increases from 1 to N.

  7. Doppler effect - Wikipedia

    en.wikipedia.org/wiki/Doppler_effect

    The Doppler effect (also Doppler shift) is the change in the frequency of a wave in relation to an observer who is moving relative to the source of the wave. [1][2][3] The Doppler effect is named after the physicist Christian Doppler, who described the phenomenon in 1842. A common example of Doppler shift is the change of pitch heard when a ...

  8. U.S. stocks tumble as September starts, investors cool on chips

    www.aol.com/news/u-stocks-tumble-investors-pause...

    The benchmark S&P 500 index, Nasdaq and Dow registered their biggest daily drop since early August. Shares of chip stocks were hard hit, with AI heavyweight Nvidia tumbling nearly 10% and Wall ...

  9. Shack–Hartmann wavefront sensor - Wikipedia

    en.wikipedia.org/wiki/Shack–Hartmann_wavefront...

    A Shack–Hartmann (or Hartmann–Shack) wavefront sensor (SHWFS) is an optical instrument used for characterizing an imaging system. [1][2] It is a wavefront sensor commonly used in adaptive optics systems. It consists of an array of lenses (called lenslets) of the same focal length. Each is focused onto a photon sensor (typically a CCD array ...

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