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  2. Perfect digital invariant - Wikipedia

    en.wikipedia.org/wiki/Perfect_digital_invariant

    In number theory, a perfect digital invariant (PDI) is a number in a given number base that is the sum of its own digits each raised to a given power (). [ 1 ] [ 2 ] Definition

  3. Perfect digit-to-digit invariant - Wikipedia

    en.wikipedia.org/wiki/Perfect_digit-to-digit...

    The following program in Python determines whether an integer number is a Munchausen Number / Perfect Digit to Digit Invariant or not, following the convention =. num = int ( input ( "Enter number:" )) temp = num s = 0.0 while num > 0 : digit = num % 10 num //= 10 s += pow ( digit , digit ) if s == temp : print ( "Munchausen Number" ) else ...

  4. Pacific Data Images - Wikipedia

    en.wikipedia.org/wiki/Pacific_Data_Images

    Pacific Data Images (PDI) was an American computer animation and visual effects production company based in Redwood City, California, that was bought by DreamWorks SKG in 2000. It was renamed PDI/DreamWorks and was owned by DreamWorks Animation .

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  6. Dispersity - Wikipedia

    en.wikipedia.org/wiki/Dispersity

    The result is a much more broad molecular weight distribution, which leads to much larger dispersities. For a homogeneous CSTR, the dispersity is proportional to the square root of the Damköhler number, but for a heterogeneous CSTR, dispersity is proportional to the natural log of the Damköhler number. [9]

  7. Power distance - Wikipedia

    en.wikipedia.org/wiki/Power_distance

    It was introduced in the 1970s by Geert Hofstede, who outlined a number of cultural theories throughout his work. Members within a power network may accept or reject the power distance within an institution's cultural framework, and the Power Distance Index (PDI) was created to measure the level of acceptance. [2] It may be low, moderate, or high.

  8. Proportional–integral–derivative controller - Wikipedia

    en.wikipedia.org/wiki/Proportional–integral...

    Here, Kp is a dimensionless number, Ki is expressed in and Kd is expressed in s. When doing a regulation where the actuator and the measured value are not in the same unit (ex. temperature regulation using a motor controlling a valve), Kp, Ki and Kd may be corrected by a unit conversion factor.

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    Get answers to your AOL Mail, login, Desktop Gold, AOL app, password and subscription questions. Find the support options to contact customer care by email, chat, or phone number.