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Table 1 Specifications of the experiment

From: Factorial experimentation on photodegradation of historical paper by polychromatic visible radiation

(a) The two levels of the three factors: [O2], RH, and illuminance used in the 23 factorial design of experimentsa

 

Low (− 1)

High (1)

[O2] (%)

0

21

RH (%)

20 (0.49)

70 (1.71)

Ev

5000 lx

20,000 lx

(b) The combinations of conditions used for each experiment in the factorial experimentsb

Experimental run number

[O2]

RH

Ev

2

− 1

− 1

− 1

1

+ 1

− 1

− 1

3

− 1

+ 1

− 1

4

+ 1

+ 1

− 1

2

− 1

− 1

+ 1

1

+ 1

− 1

+ 1

3

− 1

+ 1

+ 1

4

+ 1

+ 1

+ 1

  1. aThe volumetric water vapor concentration for each condition set is presented in parentheses in the 3rd row
  2. b− 1 and  + 1 refer to the low and high conditions respectively specified in Table 2(a)