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diff --git a/1997/CH5/EX5.1/example1.sce b/1997/CH5/EX5.1/example1.sce
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+++ b/1997/CH5/EX5.1/example1.sce
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+//Chapter-5 example 1

+//=============================================================================

+clc;

+clear;

+//input data

+mprintf('mathematically ellipsoid is represented by \n((x/a)^2)+((y/b)^2)+((z/c)^2) = 1\n ');

+mprintf('\nThe approximate expression for ellipsoid backscattered RCS is given by\n ');

+mprintf('\nσ =(π*a^2 b^2 c^2)/[ a^2 (sinθ)^2 (cosɸ)^2+ b^2 (sinθ)^2 (sinɸ)^2+c^2 (cosθ)^2 ]^2\n');

+mprintf('\nif a = b ,the ellipsoid becomes Roll symmetric,above eqn becomes\n');

+mprintf('\nσ = (π* b^4 c^2)/[ a^2 (sinθ)^2 + c^2 (cosθ)^2 ]^2\n');

+

+//===============end of the program============================================

diff --git a/1997/CH5/EX5.4/example4.sce b/1997/CH5/EX5.4/example4.sce
new file mode 100755
index 000000000..6323e5fbb
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@@ -0,0 +1,18 @@
+//Chapter-5 example 4

+//=============================================================================

+clc;

+clear;

+//input data

+lamda  = 0.03;//wavelength in m

+Pt     = 250*10^3;//transmitter power

+G      = 2000;//antenna gain

+R      = 50*10^3;//maximum range

+Pr     = 10*10^-12;//minimum detectable power

+//Calculations

+Ae     = (lamda*lamda*G)/(4*%pi);//effective aperture area

+RCS    = (Pr*(4*%pi*R*R)^2)/(Pt*G*Ae);//Radar cross section of the target

+

+//output

+mprintf('Radar cross section of the target is %3.2f m^2',RCS);

+

+//================end of the program===========================================