A1:	the factor before exponent, s−1
A2:	the amplitude of temperature fluctuation, K
b:	the number of not pyrolyzed nodes
d:	search direction
E:	activation energy, kJ/mol
J:	objective function
k:	reaction rate constant
l:	the period of temperature fluctuation, s
m:	carbon-atom number
M:	the number-average molecular weight of polyethylene wax
$\overline{M}$:	the average carbon-atom number of moleculars of polyethylene wax
n:	screw speed
n:	the maximum carbon-atom number of moleculars of polyethylene wax
$N_m$:	the number of moleculars of polyethylene wax with m carbon atoms
N:	measure point (a test under a specific process condition)
o:	the equation order of initial or modified Arrhenius equation
p:	measure point number
r:	pyrolysis ratio
R:	gas constant (8.314 J/(mol·K))
T:	temperature, K
t:	time
v:	the order of reaction dynamic equation
Z:	the total number of input measure points
Greek Symbols
$\beta$:	search step size
$\mathsf{\Delta }r$:	the increment of pyrolysis ratio
$\mathsf{\Delta }T$:	temperature fluctuation, K
$\epsilon$:	a small positive number
$\mathsf{\Omega }$:	computational domain
Subscripts
cal:	calculated
m:	melting point
mea:	measured
p:	pyrolysis
v:	evaporation
Superscripts
i, j:	iteration index