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

2 Subjects: “...closing the loop...”

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

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

5 Subjects: “...open-loop control systems...”

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

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

8 Subjects: “...closed-loop green supply chain...”

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

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