  The paper deals with the theoretical analysis of a logistic system composed
of at least two elements with distributed parameters. It has been shown that
such a system may generate specific oscillations in spite of the fact that the
solutions of the mathematical method are characterized by no dynamic
bifurcations. It has also been shown that the time series of the state
variables of such a system may behave in a semi-chaotic way. This means that
they have then predictable and unpredictable fragments. The analysis has been
illustrated by two examples, viz. of a simple logistic model and of a reactor
with feedback.
