initial commit / add all books

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diff --git a/28/CH10/EX10.8/Fig10_8_1.jpg b/28/CH10/EX10.8/Fig10_8_1.jpg
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diff --git a/28/CH10/EX10.8/Fig10_8_2.jpg b/28/CH10/EX10.8/Fig10_8_2.jpg
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diff --git a/28/CH10/EX10.8/ex10_8.sce b/28/CH10/EX10.8/ex10_8.sce
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+s=%s;

+syms K;

+g=(K/(s*(s+1)*(s+4)));

+g=((K/4)/(s*(s+1)*(0.25*s+1)))

+// given Kv=5 :velocity error constant

+K=20;

+g=(5/(s*(s+1)*(0.25*s+1)))

+G=syslin('c',g)

+fmin=0.01;

+fmax=100;

+bode(G,fmin,fmax)

+show_margins(G)

+xtitle("uncompensated system")

+[gm,freqGM]=g_margin(G)

+[pm,freqPM]=p_margin(G)

+disp(gm,"gain_margin=")

+disp((freqGM*2*%pi),"gain margin freq=");

+disp(pm,"phase margin=")

+disp((freqPM*2*%pi),"phase margin freq=");

+disp("since P.M is negative so system is unstable")

+disp("selecting zero of phase lag network at w=0.013 rad/sec and pole at w=0.13 rad/sec and applying gain to account attenuation factor")

+gc=((s+0.13)/(10*(s+0.013)))

+Gc=syslin('c',gc)

+disp(Gc,"transfer function of lag compensator=");

+G1=G*Gc

+disp(G1,"overall transfer function=");

+fmin=0.01;

+fmax=100;

+bode(G1,fmin,fmax);

+show_margins(G1)

+xtitle("compensated system")

+[gm,freqGM]=g_margin(G1);

+[pm,freqPM]=p_margin(G1);

+disp(pm,"phase margin of compensated system=")

+disp((freqPM*2*%pi),"gain cross over frequency=")