1.   A closed loop is a self-contained unit that has no identifiable beginning or end, like a circle or an integrated circuit.

2.   A closed loop that some one can catch their foot in and trip is one of the most frequent causes of industrial accidents.

3.   Systems theory suggests that a closed loop of activity, left undisturbed, will replicate itself over and over.

4.   And better still if you told the gringos what they wanted to hear, reinforcing their preconceptions, creating a closed loop of political analysis.

5.   But the point is to give whistle-blowers an avenue of appeal outside the closed loop in which they are now trapped.

6.   Finally, there is a very modern dynamic that affects, and often distorts, the conversation in this closed loop.

7.   The concrete is grooved and dyed to look like tile and is heated in the winter with pipes beneath it moving hot water in a closed loop.

8.   These sites are essentially closed loops, allowing children browsing rights through a prequalified terrain.

9.   This is a flat band of metal curved into a closed loop.