1.   In closed systems the fear of being considered faint-hearted, or uninvolved, or unsupportive prevents such doubts being voiced at all.

2.   The attraction of their closed system was considerable.

3.   The Base was a closed system, like a tiny working model of Earth itself, recycling all the chemicals of life.

4.   The closed system is thus characteristic of grammar, the open set of lexis.

5.   The second is to gain the knowledge and experience to maintain humans within equilibrium in a closed ecological system.

6.   This says that in any closed system disorder, or entropy, always increases with time.

7.   This, in a nutshell, is how closed organizational systems become self-defeating.

8.   The model assumes a closed system without migration.

9.   A closed system is a system in which there is no net gain or loss of matter in the system.