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  2. Logarithmic decrement - Wikipedia

    en.wikipedia.org/wiki/Logarithmic_decrement

    The logarithmic decrement is defined as the natural log of the ratio of the amplitudes of any two successive peaks: where x ( t) is the overshoot (amplitude - final value) at time t and x(t + nT) is the overshoot of the peak n periods away, where n is any integer number of successive, positive peaks. The damping ratio is then found from the ...

  3. Delta E - Wikipedia

    en.wikipedia.org/wiki/Delta_E

    The Delta E, or Thor-Delta E was an American expendable launch system used for twenty-three orbital launches between 1965 and 1971. It was a member of the Delta family of rockets. The first stage was a Thor missile in the DSV-2C configuration, and the second stage was the Delta-E, which was derived from the earlier Delta-A.

  4. Delta L - Wikipedia

    en.wikipedia.org/wiki/Delta_L

    The Delta L, Thor-Delta L, or Thrust-Augmented Long Tank Thor-Delta was a US expendable launch system used to launch the Pioneer E and TETR satellites in 1969 (failed) and HEOS satellite in 1972. It was a member of the Delta family of rockets.

  5. Delta D - Wikipedia

    en.wikipedia.org/wiki/Delta_D

    The Delta D, Thrust Augmented Delta or Thor-Delta D was an American expendable launch system used to launch two communications satellites in 1964 and 1965. It was derived from the Delta C, and was a member of the Delta family of rockets. The three-stage core vehicle was essentially the same as the Delta C.

  6. Delta J - Wikipedia

    en.wikipedia.org/wiki/Delta_J

    It was a member of the Delta family of rockets. The Delta J was derived from the Delta E. The first stage was a Thor missile in the DSV-2C configuration, with three Castor-1 solid rocket boosters clustered around it. A Delta E was used as the second stage. The Altair third stage of the Delta E was replaced with the more powerful Star 37D SRM.

  7. Iota Nu Delta - Wikipedia

    en.wikipedia.org/wiki/Iota_Nu_Delta

    Iota Nu Delta (ΙΝΔ, also IND) is the first South Asian interest college fraternity. IND was founded in 1994 at the Binghamton University . It is a member of the North American Interfraternity Conference since 2007 and National APIDA Panhellenic Association since 2016.

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