No Title  |POLVER05_0 |1
k = 0.1 
d(X) / d(t) = -ra/Ca0 
X(0) = 0
d(Xseg) / d(t) = X*E 
Xseg(0) = 0
Ca = Ca0*(1-X) 
E1=0.01*t - 0.1 
E2=0.3 - 0.01*t
E=if(t<=10) then (0) else if (t>=10 and t <=20) then (E1) else (E2)
Ca0=8
ra=if(t<=10) then (0) else if (t>=10 and t <=14) then (-k*Ca^0.6) else (-k*Ca^2.7)
t(0) = 0
t(f) = 30