Table 1 Conditions with different combinations of independent variable used in central composite rotatable second order design for response surface methodology
Treatment No. | X1 | X2 | Heating Temperature (t) | Heating Time (T) |
|---|---|---|---|---|
1 | −1 | −1 | 100 | 1 |
2 | −1 | −0.5 | 100 | 3 |
3 | −1 | −0.1 | 100 | 5 |
4 | −1 | 1 | 100 | 10 |
5 | 0 | −1 | 150 | 1 |
6 | 0 | −0.5 | 150 | 3 |
7 | 0 | −0.1 | 150 | 5 |
8 | 0 | 1 | 150 | 10 |
9 | 1 | −1 | 200 | 1 |
10 | 1 | −0.5 | 200 | 3 |
11 | 1 | −0.1 | 200 | 5 |
12 | 1 | 1 | 200 | 10 |