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+// Example 6.22.3  page 6.73
+
+clc;
+clear;
+
+beta0=1.85d7;
+T=293;      //temperature
+k=1.38d-23; //Boltzman constant
+Ea=0.9*1.6d-19;
+theta=0.65; //thershold
+
+betar=beta0*%e^(-Ea/(k*T));
+t=-log(theta)/betar;
+
+printf("\nDegradation rate is %.2e per hour.\nOperating lifetime is %.1e hour.",betar,t);
+
+//answer in the book for Degradation rate is 6.4e-09 per hour, deviation of 0.08e-9
+//answer in the book for Operating lifetime is 6.7e+07 hour, deviaiton of 0.1e1