Das politische System Frankreichs

Abstract

Die Deutsche Nationalbibliothek verzeichnet diese Publikation in der Deutschen Nationalbibliografie; detaillierte bibliografische Daten sind im Internet über http://dnb.d-nb.de abrufbar.

Control problems in autonomous life support systems

“…It would certainly be unwise to adopt a different definition of stability when referring to ecosystems, but one must not neglect the fact that, in the case of ecosystems, it is not appropriate to equate instability with non-survival. As said by Kempf [ 3 ] "the flow of an ecosystem across its dynamical landscape is more like the flow of water across a hilly region than the movement of a water drop on the side of a coffee cup". Consider for instance the case of an ecosystem in which one or more species have diminuished in numbers from their original equilibrium state, due to some external perturbation.…”