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+//chapter 5 example 3a//
+clc
+clear
+//threshold temperature=To,ratio of current densities=R,current density=Jth,curren density at 20 deg =J1,current density at 80deg=J2//
+//J1=Jth*(exp((273+20)/160))//
+//J2=Jth*(exp((273+80)/160))//
+K1=(exp((273+20)/160));
+K2=(exp((273+80)/160));
+R=K2/K1;//for AlGaAs//
+printf("\n ratio of current densities for AlGaAs=%f\n",R)
+//J1=Jth0*exp(273+20)/55/
+//J2=Jtho(exp((273+80)/55//
+K1a=(exp((273+20)/55));
+K2a=(exp((273+80)/55));
+R1=K2a/K1a;//for AlGaAsp//
+printf("\n ratio of current densities for AlGaAsp=%f\n",R1)
+\ No newline at end of file