initial commit / add all books

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diff --git a/2453/CH8/EX8.5/8_5.sce b/2453/CH8/EX8.5/8_5.sce
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+//To calculate the resistance

+ni = 2.5*10^19;      //intrinsic carrier density, per m^3

+mew_e = 0.39;      //electron mobility, m^2/Vs

+mew_h = 0.19;      //hole mobility, m^2/Vs

+e = 1.6*10^-19;

+sigma_i = ni*e*(mew_e+mew_h);      //conductivity, ohm-1 m-1

+w = 1;     //width, mm

+w = w*10^-3;       //width, m

+t = 1;     //thickness, mm

+t = t*10^-3;     //thickness, m

+A = w*t;      //area, m^2

+l = 1;     //length, cm

+l = l*10^-2;     //length, m

+R = l/(sigma_i*A);      //resistivity, ohm m

+printf("resistance of intrinsic Ge rod is %5.1f ohm",R);