1 Subjects: “...closed-loop recycling...”

2 Subjects: “...hardware-in-the-loop testing...”

3 Subjects: “...sensitivity loop...”

4 Subjects: “...coal-direct chemical looping combustion...”

5 Subjects: “...causal loop diagram...”

6 Subjects: “...causal loop diagram...”

7 Subjects: “...closed-loop circulation...”

8 Subjects: “...closed material loops...”

9 Subjects: “...loop order analysis...”

10 Subjects: “...heat recovery loop (HRL)...”

11 Subjects: “...hysteresis loops...”