Nyquist diagram

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Nyquist diagram

[′nī‚kwist ‚dī·ə‚gram]
(control systems)
A plot in the complex plane of the open-loop transfer function as the complex frequency is varied along the Nyquist contour; used to determine stability of a control system.
References in periodicals archive ?
5P coatings, the Nyquist diagrams after selected times of immersion in 3.
With attention to the Nyquist diagrams and equivalent circuits and data extracted from EIS software, Table 3 shows [R.
8(b), after 120 days of immersion, the second loop appeared in the Nyquist diagram of NR coating which means the corrosion reactions.
Because impedance is a complex number with real component, Re(Z), and imaginary component, Im(Z), EIS spectra are generally plotted in either Bode or Nyquist diagrams.
In a Nyquist diagram, Im(Z) is plotted against Re(Z), and frequency is contained implicitly.
All the remain Nyquist diagrams show approximately a semicircle indicating that the charge transfer process control the alloy corrosion and the rise temperature does not change the mechanism of the amorphous alloy dissolution.
The diffusion tail is also observed at Nyquist diagrams in presence of inhibitor MEBndthioSCAzn and BrBndthioSCAzn in the range (40-60[degrees]C) where the [b.
The Nyquist diagrams of high solid polyurethane coating with two dry film thicknesses of 250 and 1000 [micro]m at 20[degrees]C are shown in Figs.
The Nyquist diagrams of high solid polyurethane coating with two dry thicknesses of 1000 and 250 [micro]m at 50[degrees]C are shown in Figs.
The trends of Nyquist diagrams related to the thicker coating (1000 micro]m) at both the temperatures are similar.