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  2. Landau levels - Wikipedia

    en.wikipedia.org/wiki/Landau_levels

    If Zeeman splitting is included, each Landau level splits into a pair, one for spin up electrons and the other for spin down electrons. Then the occupation of each spin Landau level is just the ratio of fluxes = /. Zeeman splitting has a significant effect on the Landau levels because their energy scales are the same, =. However, the Fermi ...

  3. Liquid rheostat - Wikipedia

    en.wikipedia.org/wiki/Liquid_rheostat

    Liquid rheostats used as motor start switches, circa 1900. A liquid rheostat or water rheostat [1] or salt water rheostat is a type of variable resistor.This may be used as a dummy load or as a starting resistor for large slip ring motors.

  4. Landau–Zener formula - Wikipedia

    en.wikipedia.org/wiki/Landau–Zener_formula

    The Landau–Zener formula is an analytic solution to the equations of motion governing the transition dynamics of a two-state quantum system, with a time-dependent Hamiltonian varying such that the energy separation of the two states is a linear function of time.

  5. Korndörfer autotransformer starter - Wikipedia

    en.wikipedia.org/wiki/Korndörfer_Autotransformer...

    Korndorfer starter with motor (M), autotransformer (AT) and three switches (1, 2, 3) In electrical engineering, the Korndorfer starter is a technique used for reduced voltage soft starting of induction motors. The circuit uses a three-phase autotransformer and three three-phase switches. This motor starting method has been updated and improved ...

  6. Avoided crossing - Wikipedia

    en.wikipedia.org/wiki/Avoided_crossing

    In quantum physics and quantum chemistry, an avoided crossing (AC, sometimes called intended crossing, [1] non-crossing or anticrossing) is the phenomenon where two eigenvalues of a Hermitian matrix representing a quantum observable and depending on continuous real parameters cannot become equal in value ("cross") except on a manifold of dimension . [2]

  7. Magnetic starter - Wikipedia

    en.wikipedia.org/wiki/Magnetic_starter

    A magnetic starter has a contactor and an overload relay, which will open the control voltage to the starter coil if it detects an overload on a motor. [1] [2] The overload relay opens a set of contacts that are wired in series with the supply to the contactor feeding the motor. The characteristics of the heaters can be matched to the motor so ...

  8. Category:Level crossings - Wikipedia

    en.wikipedia.org/wiki/Category:Level_crossings

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  9. Landau theory - Wikipedia

    en.wikipedia.org/wiki/Landau_theory

    This is because Landau theory is a mean field theory, and does not include long-range correlations. This theory does not explain non-analyticity at the critical point, but when applied to superfluid and superconductor phase transition, Landau's theory provided inspiration for another theory, the Ginzburg–Landau theory of superconductivity.