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  2. Low thrust relative orbital transfer - Wikipedia

    en.wikipedia.org/wiki/Low_thrust_relative...

    Low-thrust relative transfer uses the orbital relative motion equations which are the non-linear set of equations that describes the motion of the chaser spacecraft relative to the target in terms of displacements along the respective axis of the accelerated frame of reference fixed on the target spacecraft.

  3. Local-density approximation - Wikipedia

    en.wikipedia.org/wiki/Local-density_approximation

    Local-density approximations (LDA) are a class of approximations to the exchange–correlation (XC) energy functional in density functional theory (DFT) that depend solely upon the value of the electronic density at each point in space (and not, for example, derivatives of the density or the Kohn–Sham orbitals). Many approaches can yield ...

  4. Tsiolkovsky rocket equation - Wikipedia

    en.wikipedia.org/wiki/Tsiolkovsky_rocket_equation

    A rocket's required mass ratio as a function of effective exhaust velocity ratio. The classical rocket equation, or ideal rocket equation is a mathematical equation that describes the motion of vehicles that follow the basic principle of a rocket: a device that can apply acceleration to itself using thrust by expelling part of its mass with high velocity and can thereby move due to the ...

  5. Symmetric mean absolute percentage error - Wikipedia

    en.wikipedia.org/wiki/Symmetric_mean_absolute...

    One supposed problem with SMAPE is that it is not symmetric since over- and under-forecasts are not treated equally. The following example illustrates this by applying the second SMAPE formula: Over-forecasting: A t = 100 and F t = 110 give SMAPE = 4.76%; Under-forecasting: A t = 100 and F t = 90 give SMAPE = 5.26%.

  6. Error analysis for the Global Positioning System - Wikipedia

    en.wikipedia.org/wiki/Error_analysis_for_the...

    These problems tend to be very small, but may add up to a few meters (tens of feet) of inaccuracy. [7] For very precise positioning (e.g., in geodesy), these effects can be eliminated by differential GPS: the simultaneous use of two or more receivers at several survey points.

  7. London Stock Exchange Group - Wikipedia

    en.wikipedia.org/wiki/London_Stock_Exchange_Group

    London Stock Exchange Group plc, also known as LSEG, is a global provider of financial markets data and infrastructure headquartered in London, England. It owns the London Stock Exchange (on which it is also listed), Refinitiv , LSEG Technology, [ 4 ] FTSE Russell , and majority stakes in LCH and Tradeweb .

  8. Valuation using multiples - Wikipedia

    en.wikipedia.org/wiki/Valuation_using_multiples

    Usefulness: Valuation is about judgment, and multiples provide a framework for making value judgements. When used properly, multiples are robust tools that can provide useful information about relative value. Simplicity: Their very simplicity and ease of calculation makes multiples an appealing and user-friendly method of assessing value.

  9. Darcy friction factor formulae - Wikipedia

    en.wikipedia.org/wiki/Darcy_friction_factor_formulae

    The pipe's relative roughness ε / D, where ε is the pipe's effective roughness height and D the pipe (inside) diameter. f stands for the Darcy friction factor. Its value depends on the flow's Reynolds number Re and on the pipe's relative roughness ε / D.