A Kalman filter as a minimax estimator

A minimax terminal state estimation problem is posed for a linear plant and a generalized quadratic loss function. Sufficient conditions are developed to insure that a Kalman filter will provide a minimax estimate for the terminal state of the plant. It is further shown that this Kalman filter will not generally be a minimax estimate for the terminal state if the observation interval is arbitrarily long. Consequently, a subminimax estimate is defined, subject to a particular existence condition. This subminimax estimate is related to the Kalman filter, and it may provide a useful estimate for the terminal state when the performance of the Kalman filter is no longer satisfactory.     

Efficient stimulated Raman scattering in silicon

Stimulated Raman scattering in silicon was investigated at liquid helium temperatures. A Q-switched single mode Nd: YAG laser was used to generate Stokes radiation at 1.127 μm. Time resolved measurements give a maximum power conversion efficiency of 20%. The effects of intensity induced losses are discussed.     

Die Chromatographie der Ellags?ure

Ohne Zusammenfassung     

Der Nachweis des Eisens als Tri-n-butylammonium-eisen(III)-rhodanid

Ohne ZusammenfassungHierüber und über die quantitative Bestimmung des Eisens wird in Kürze berichtet.     

Diskontinuierliche und diskrete Gruppen von Isometrien metrischer Räume

Ohne Zusammenfassung