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Rubidium is a chemical element; it has symbol Rb and atomic number 37. It is a very soft, whitish-grey solid in the alkali metal group, similar to potassium and caesium. [9] Rubidium is the first alkali metal in the group to have a density higher than water.
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.) [ 1 ] Tethered – headsets that act as a display device to another device, like a PC or a video game console , to provide a virtual reality experience.
Commercial rubidium clocks are less accurate than caesium atomic clocks, which serve as primary frequency standards, so a rubidium clock is usually used as a secondary frequency standard. Commercial rubidium frequency standards operate by disciplining a crystal oscillator to the rubidium hyperfine transition of 6.8 GHz (6 834 682 610.904 Hz).
Quest 2 is a standalone virtual reality headset developed by Reality Labs, a division of Meta Platforms.It was unveiled on September 16, 2020, and released on October 13, 2020 as the Oculus Quest 2.
Atomic clocks based on rubidium standards are therefore regarded as secondary representations of the second. Rubidium standard clocks are prized for their low cost, small size (commercial standards are as small as 1.7 × 10 5 mm 3) [33] and short-term stability. They are used in many commercial, portable and aerospace applications.
Basic versions of the technique are referred to as asynchronous reprojection by Google and Valve, [1] [4] while Oculus has two implementations, called asynchronous timewarp [2] and asynchronous spacewarp. Asynchronous timewarp uses the headset's rotational data to extrapolate a new rendered frame based on the last frame it received.