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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. Dirac delta function - Wikipedia

    en.wikipedia.org/wiki/Dirac_delta_function

    In mathematical analysis, the Dirac delta function (or δ distribution ), also known as the unit impulse, [1] is a generalized function on the real numbers, whose value is zero everywhere except at zero, and whose integral over the entire real line is equal to one. [2] [3] [4] Since there is no function having this property, to model the delta ...

  4. List of Phi Delta Theta chapters - Wikipedia

    en.wikipedia.org/wiki/List_of_Phi_Delta_Theta...

    This article lists the chapters of Phi Delta Theta.Chapters are listed with their installation date, university and status. The information was gathered from a mixture of Baird's Manual and the online archive, The Scroll, The Chapter lists, and the locate chapter function on the national website.

  5. Delta Air Lines Flight 1141 - Wikipedia

    en.wikipedia.org/wiki/Delta_Air_Lines_Flight_1141

    Delta Air Lines Flight 1141 was a scheduled domestic passenger flight between Dallas/Fort Worth, Texas and Salt Lake City, Utah. On August 31, 1988, the flight, using a Boeing 727-200 series aircraft, crashed during takeoff, resulting in 14 deaths and 76 injuries of the 108 on board.

  6. Delta Cygni - Wikipedia

    en.wikipedia.org/wiki/Delta_Cygni

    Delta Cygni is a visible star located within 3° of the precessional path traced across the celestial sphere by the Earth's North pole. For at least four centuries around 11,250 AD it will probably be considered a pole star , a title currently held by Polaris which is just 0.5° off of the precessional path.

  7. Omicron Delta Epsilon - Wikipedia

    en.wikipedia.org/wiki/Omicron_Delta_Epsilon

    Omicron Delta Epsilon (ΟΔΕ or ODE) is an international honor society in the field of economics, formed from the merger of Omicron Delta Gamma and Omicron Chi Epsilon, in 1963. Its board of trustees includes well-known economists such as Robert Lucas , Paul Romer , and Robert Solow .

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