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A two-level estimator for time varying parameters

A crucial part in an adaptive control system is the estimation of the unknown parameters of the process. The estimation is often done using a Kalman filter or an Extended Kalman filter. These estimators give good results if the parameters are not varying too fast. When the parameters are varying fast there are difficulties for the estimator to follow the variations. This paper outlines a new appr

Particle-Induced X-Ray Emission: A Useful Analytical Method

Abstract in UndeterminedIn 1970, it was shown experimentally by Johansson et al. that the excitation of atoms by charged particles, e.g. protons, and the subsequent detection of the induced X-rays by an energy-dispersive detector constitutes a non-destructive multi-elemental method with low detection limits and several other properties desirable in an analytical method. Since then, many investigat