Mean Residence Time Calculation  |POLVER05_0 |1
E = C/Area 
Area=51
t(0) = 0
t(f) = 14


d(tm) / d(t) = t*E 
tm(0) = 0
C=If(t<=4 and t>=0 ) then C1 else if(t>4 and t<=14) then C2 else 0
C1= 0.0038746 + 0.2739782*t + 1.574621*t^2 - 0.2550041*t^3
C2= -33.43818 + 37.18972*t - 11.58838*t^2 + 1.695303*t^3 - 0.1298667*t^4 + 0.005028*t^5 - 7.743*10^-5*t^6
d(F) / d(t) = E 
F(0) = 0