initial commit / add all books

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diff --git a/2409/CH12/EX12.8/Ex12_8.sce b/2409/CH12/EX12.8/Ex12_8.sce
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+
+//Variable Declaration
+
+Tant=35     //Antenna noise temperature(kelvin)
+Te1=150     //Receiver noise temperature(kelvin)
+L=5         //Cable Loss (dB)
+T0=290    
+G1=10**5    //LNA Gain
+F=12        //Receiver Noise figure(dB)
+
+//Calculation
+
+L=10**(L/10)  //Converting L into ratio
+F=10**(F/10)  //Converting F into ratio
+Ts=Tant+(L-1)*T0+L*Te1+L*(F-1)*T0/G1  //Noise Temperature referred to the input(Kelvin)
+
+
+//Result
+printf("The noise temperature referred to the input is %.0f Kelvin",Ts)
+