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Factors and levels for CCD design.
| No. | Factors | Levels | ||||
|---|---|---|---|---|---|---|
| (α = −1.414) | (−1) | Center (0) | (+1) | (α = 1.414) | ||
| 1 | A-Flow rate (mL/h) | 3.031 | 3.04 | 3.06 | 3.08 | 3.088 |
| 2 | B-Voltage (kV) | 33.17 | 34 | 36 | 38 | 38.82 |
| 3 | C-Maghemite (%) | 3.42 | 3.53 | 3.80 | 4.06 | 4.17 |
| 4 | D-Concentration (wt %) | 4.91 | 5.40 | 6.54 | 7.70 | 8.16 |
| 5 | E-Rotating speed (rpm) | 2087 | 2110 | 2165 | 2220 | 2242 |
