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Journal of Engineering
/
2014
/
Article
/
Tab 1
/
Research Article
Application of
Full Factorial Design in Optimization of Solvent-Free Microwave Extraction of Ginger Essential Oil
Table 1
Coded and natural variables in 2
3
factorial design.
Levels
[min.]
[watt]
Basic level (0)
20
464
—
High level (+1)
30
640
Sliced
Low level (−1)
10
288
Crushed
Interval
10
176
—