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+clc;funcprot(0);//EXAMPLE 5.4

+//page 129

+// Initialisation of Variables

+N=1;..........//N0. of atoms on one side of iron bar

+H=1;..........//No. of atoms onother side of iron bar

+d=3;.......//Diameter of an impermeable cylinder in cm

+l=10;.....//Length of an impermeable cylinder in cm

+A1=50*10^18*N;..........// No. of gaseous Atoms per cm^3 on one side 

+A2=50*10^18*H;..........//No. of gaseous Atom per cm^3 on one  side

+B1=1*10^18*N;...........//No. of gaseous atoms per cm^3 on another side

+B2=1*10^18*H;..........//No. of gaseous atoms per cm^3 on another side

+t=973;...........//The di¤usion coefficient of nitrogen in BCC iron at 700 degree celsius in K

+Q=18300;.........//The activation energy for di¤usion of Ceramic

+Do=0.0047;.......//The pre-exponential term of ceramic

+R=1.987;.........//Gas constant in cal/mol.K

+//CALCULATIONS

+T=A1*(%pi/4)*d^2*l;....//The total number of nitrogen atoms in the container in N atoms

+LN=0.01*T/3600;......//The maximum number of atoms to be lost per second in N atoms per Second

+JN=LN/((%pi/4)*d^2);.........//The Flux of ceramic in Natoms per cm^2. sec.

+Dn=Do*exp(-Q/(R*t));........//The di¤usion coefficient of Ceramic in cm^2/Sec

+deltaX=Dn*(A1-B1)/JN;.........//minimum thickness of the membrane in cm

+LH=0.90*T/3600;........//Hydrogen atom loss per sec.

+JH=LH/((%pi/4)*d^2);.........//The Flux of ceramic in Hatoms per cm^2. sec.

+Dh=Do*exp(-Q/(R*t));........//The di¤usion coeficient of Ceramic in cm^2/Sec

+deltaX2=((1.86*10^-4)*(A2-B2))/JH;.......//Minimum thickness of  the membrane in cm

+disp(deltaX,"Minimum thickness of  the membrane of Natoms in cm")

+disp(deltaX2,"Minimum thickness of  the membrane of Hatoms in cm")