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  2. Root locus analysis - Wikipedia

    en.wikipedia.org/wiki/Root_locus_analysis

    Since root locus is a graphical angle technique, root locus rules work the same in the z and s planes. The idea of a root locus can be applied to many systems where a single parameter K is varied. For example, it is useful to sweep any system parameter for which the exact value is uncertain in order to determine its behavior.

  3. Pole–zero plot - Wikipedia

    en.wikipedia.org/wiki/Pole–zero_plot

    In mathematics, signal processing and control theory, a pole–zero plot is a graphical representation of a rational transfer function in the complex plane which helps to convey certain properties of the system such as:

  4. File:Root Locus diagram with three poles and one zero.svg

    en.wikipedia.org/wiki/File:Root_Locus_diagram...

    English: Original work by Whiteknight to illustrate root-locus diagram in Wikibook "Control Systems". Edited Octave function file "rlocus.m" to make markers more visible Edited Octave function file "rlocus.m" to make markers more visible

  5. Archimedean spiral - Wikipedia

    en.wikipedia.org/wiki/Archimedean_spiral

    Asking for a patient to draw an Archimedean spiral is a way of quantifying human tremor; this information helps in diagnosing neurological diseases. Archimedean spirals are also used in digital light processing (DLP) projection systems to minimize the " rainbow effect ", making it look as if multiple colors are displayed at the same time, when ...

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  7. Christian aid groups suffering after Trump freezes USAID ...

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    World Relief is an evangelical organization whose work has collapsed in certain countries after the Trump administration froze most foreign aid and sidelined the U.S. Agency for International ...

  8. Today’s NYT ‘Strands’ Hints, Spangram and Answers for Friday ...

    www.aol.com/today-nyt-strands-hints-spangram...

    According to the New York Times, here's exactly how to play Strands: Find theme words to fill the board. Theme words stay highlighted in blue when found.

  9. Walter R. Evans - Wikipedia

    en.wikipedia.org/wiki/Walter_R._Evans

    Walter Richard Evans (January 15, 1920 – July 10, 1999) was a noted American control theorist and the inventor of the root locus method and the Spirule device in 1948. He was the recipient of the 1987 American Society of Mechanical Engineers Rufus Oldenburger Medal [1] and the 1988 AACC's Richard E. Bellman Control Heritage Award.