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  2. Simplex algorithm - Wikipedia

    en.wikipedia.org/wiki/Simplex_algorithm

    The simplex method is remarkably efficient in practice and was a great improvement over earlier methods such as Fourier–Motzkin elimination. However, in 1972, Klee and Minty [32] gave an example, the Klee–Minty cube, showing that the worst-case complexity of simplex method as formulated by Dantzig is exponential time. Since then, for almost ...

  3. Two-phase electric power - Wikipedia

    en.wikipedia.org/wiki/Two-phase_electric_power

    Induction motors designed for two-phase operation use a similar winding configuration as capacitor start single-phase motors. However, in a two-phase induction motor, the impedances of the two windings are identical. Two-phase circuits also have the advantage of constant combined power into an ideal load, whereas power in a single-phase circuit ...

  4. Circle diagram - Wikipedia

    en.wikipedia.org/wiki/Circle_diagram

    The circle diagram can be drawn for alternators, synchronous motors, transformers, induction motors. The Heyland diagram is an approximate representation of a circle diagram applied to induction motors, which assumes that stator input voltage, rotor resistance and rotor reactance are constant and stator resistance and core loss are zero.

  5. Revised simplex method - Wikipedia

    en.wikipedia.org/wiki/Revised_simplex_method

    Because the revised simplex method is mathematically equivalent to the simplex method, it also suffers from degeneracy, where a pivot operation does not result in a decrease in c T x, and a chain of pivot operations causes the basis to cycle. A perturbation or lexicographic strategy can be used to prevent cycling and guarantee termination.

  6. Two-phase - Wikipedia

    en.wikipedia.org/wiki/Two-phase

    Two-phase may refer to: Two-phase electric power; Two-phase commit protocol; Two-phase flow; Two-phase locking; Binary phase, chemical compounds composed of two elements

  7. Scott-T transformer - Wikipedia

    en.wikipedia.org/wiki/Scott-T_transformer

    Two-phase motors draw constant power, just as three-phase motors do, so a balanced two-phase load is converted to a balanced three-phase load. However if a two-phase load is not balanced (more power drawn from one phase than the other), no arrangement of transformers (including the Scott-T transformers) can restore balance: Unbalanced current ...

  8. Linear transformation in rotating electrical machines - Wikipedia

    en.wikipedia.org/wiki/Linear_transformation_in...

    Transformation of three phase electrical quantities to two phase quantities is a usual practice to simplify analysis of three phase electrical circuits. Polyphase a.c machines can be represented by an equivalent two phase model provided the rotating polyphases winding in rotor and the stationary polyphase windings in stator can be expressed in a fictitious two axes coils.

  9. Load bank - Wikipedia

    en.wikipedia.org/wiki/Load_bank

    [2] Typically, facilities require motor-driven devices, transformers and capacitors. If this is the case, then the load banks used for testing require reactive power compensation. The ideal solution is a combination of both resistive and reactive elements in one load bank package.