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+//Example 17.6//
+
+s=100;//ohm^-1 m^-1 //preexponential constant
+k=86.2*10^-6;//eV K^-1 //Boltzmann constant
+T=298;//K //Temperature
+Eg=1.0;//eV // band gap
+Ed=0.9;//eV //donor level
+//AT 25 degree C
+s0=s*%e^((Eg-Ed)/(k*T))
+mprintf("s0 = %e ohm^-1 m^-1",s0)
+//At 30degree C
+T1=303;//K//temperature
+s=s0*%e^-((Eg-Ed)/(k*T1))
+mprintf("\ns = %i ohm^-1 m^-1",s)