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Undergraduate process control: Clarification of some concepts

01-03-2001, R Ravi

The concept of frequency response for linear time-invariant systems is clarified, demonstrating its validity for unstable systems as well. Some pitfalls in the use of the Nyquist criterion and the ways to avoid them are highlighted.

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Publication

Comments on the culture of the force [2] (multiple letters)

01-01-2005, R Ravi, Meeker, Brent, Ralston, John, Wilczek, Frank