Kalman filter as the third person of the Landsbergian scheme in heavy ions reactions

Energetic heavy ion collisions are generally not equilibrium processes in thermodynamic sense. Therefore, even the number of thermodynamic degrees of freedom is not a priori known. It is shown that a combination of Landsberg's scheme for finding the independent macroscopic variables and the Kalman filtering of systems analysis yields an operative tool for determining the degrees of freedom. The procedure is demonstrated on a simple example, which, however is a reaction definitely off local equilibrium. (author) 8 refs.; 1 fig