Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The coded and real value of factors in central composite design
| Substrates | Factors | Symbols |
Coded variables |
||||
|---|---|---|---|---|---|---|---|
| -1.41421 | -1 | 0 | +1 | +1.41421 | |||
| 55, 70 and 74 |
Temperature (°C) |
X1 |
175.9 |
180 |
190 |
200 |
204.1 |
| Residence time (minutes) |
X2 |
2.93 |
5 |
10 |
15 |
17.07 |
|
| 120 | Temperature (°C) |
X1 |
180.9 |
185 |
195 |
205 |
209.1 |
| Residence time (minutes) | X2 | 1.93 | 4 | 9 | 14 | 16.07 | |
