initial commit / add all books

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diff --git a/1309/CH12/EX12.4/ch12_4.sce b/1309/CH12/EX12.4/ch12_4.sce
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+clc;
+clear;
+printf("\t\t\tChapter12_example4\n\n\n");
+// Determination of the heat transferred to the conveyed parts for the conditions given
+L1=1;
+angle=%pi*45/180;
+L2=L1*sin(angle);
+L3=L2;
+printf("\nThe Widths are L1=%d m, L2=%.3f m and L3=%.3f m",L1,L2,L3);
+T1=303;
+T2=473;
+sigma=5.67e-8; // Stefan-Boltzmann constant
+q21_A2=sigma*(T2^4-T1^4)*((L1/L2)+1-(L3/L2))/2;
+q31_A3=sigma*(T2^4-T1^4)*((L1/L2)-1+(L3/L2))/2;
+printf("\nThe heat transferred from A2 to A1 is %.2e W/sq.m",q21_A2);
+printf("\nThe heat transferred from A3 to A1 is %.2e W/sq.m",q31_A3);