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  2. List of Fitbit products - Wikipedia

    en.wikipedia.org/wiki/List_of_Fitbit_products

    The Fitbit Classic was a small black and teal device that could be clipped and worn 24/7. It uses a three-dimensional accelerometer to sense user movement. The Tracker measures steps taken as well as user data to calculate distance walked, calories burned, floors climbed, and activity duration and intensity.

  3. The Fitbit Sense is a smartwatch that can track your stress ...

    www.aol.com/fitbit-sense-smartwatch-track-stress...

    For the past few years, the Fitbit Versa line has been the company’s flagship smartwatch, but now there’s a new chief model in town. The Sense and Versa 3 appear quite similar at a glance, but ...

  4. Fitbit - Wikipedia

    en.wikipedia.org/wiki/Fitbit

    The Fitbit Charge 3, a wristband health and fitness tracker introduced in October 2018, was the first device to feature an oxygen saturation (SPO2) sensor; however, as of January 2019, it was non-functional and Fitbit did not provide an implementation timeline. [44] The Fitbit Charge 3 comes with two different-sized bands: small and large.

  5. Anderson's rule - Wikipedia

    en.wikipedia.org/wiki/Anderson's_rule

    The band gap (usually given the symbol ) gives the energy difference between the lower edge of the conduction band and the upper edge of the valence band. Each semiconductor has different electron affinity and band gap values. For semiconductor alloys it may be necessary to use Vegard's law to calculate these values.

  6. Bandwidth (signal processing) - Wikipedia

    en.wikipedia.org/wiki/Bandwidth_(signal_processing)

    Bandwidth is the difference between the upper and lower frequencies in a continuous band of frequencies. It is typically measured in unit of hertz (symbol Hz). It may refer more specifically to two subcategories: Passband bandwidth is the difference between the upper and lower cutoff frequencies of, for example, a band-pass filter , a ...

  7. Band diagram - Wikipedia

    en.wikipedia.org/wiki/Band_diagram

    Because a band diagram shows the changes in the band structure from place to place, the resolution of a band diagram is limited by the Heisenberg uncertainty principle: the band structure relies on momentum, which is only precisely defined for large length scales. For this reason, the band diagram can only accurately depict evolution of band ...

  8. Rule of mixtures - Wikipedia

    en.wikipedia.org/wiki/Rule_of_mixtures

    The upper and lower bounds on the elastic modulus of a composite material, as predicted by the rule of mixtures. The actual elastic modulus lies between the curves. In materials science , a general rule of mixtures is a weighted mean used to predict various properties of a composite material .

  9. Band matrix - Wikipedia

    en.wikipedia.org/wiki/Band_matrix

    A band matrix with k 1 = k 2 = 1 is a tridiagonal matrix, with bandwidth 1. For k 1 = k 2 = 2 one has a pentadiagonal matrix and so on. Triangular matrices. For k 1 = 0, k 2 = n−1, one obtains the definition of an upper triangular matrix; similarly, for k 1 = n−1, k 2 = 0 one obtains a lower triangular matrix. Upper and lower Hessenberg ...

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