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+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 12: The Solid State"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 12.1: Classical_free_electron_model.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"// Scilab code Ex12.1: Pg 418 (2005)\n",
+"clc; clear;\n",
+"// Part (a)\n",
+"k_B = 1.38e-23;   // Boltzmann constat, J/K\n",
+"m_e = 9.11e-31;    // Mass of electron, kg\n",
+"T = 300;   // Temperature, K\n",
+"N_A = 6.023e+023;    // Avogadro's number\n",
+"v_rms = sqrt((3*k_B*T)/m_e);       // Root mean square velocity of electrons, m/s\n",
+"I = 10;   // Electric current, A\n",
+"A = 4e-06;    // Area of cross-section of copper wire, m^2\n",
+"J = I/A;   // Current density, A-m^(-2)\n",
+"d = 8.96;    // Density of copper at room temperature, g/cc\n",
+"M = 63.5;    // Atomic mass of Cu, g\n",
+"n = d*N_A/M*1e+06;    // Number of electrons per metre cube\n",
+"e = 1.6e-19;    // Charge on electron, C\n",
+"v_d = J/(n*e);    // Drift velocity, m/s\n",
+"v_d_rms  = v_d/v_rms;    // Ratio of drift speed to rms speed\n",
+"printf('\nThe ratio of drift speed to rms speed is = %3.1e', v_d_rms);\n",
+"\n",
+"// Part (b)\n",
+"L = 2.6e-10;\n",
+"tau = L/v_rms;   // Average time between two collisions, s\n",
+"printf('\nAverage time between two collisions = %2.2e s', tau);\n",
+"\n",
+"// Part (c)\n",
+"sigma = (n*e^2*L)/sqrt(3*k_B*T*m_e);  // Conductivity of copper, per ohm-m\n",
+"printf('\nConductivity of copper at room temperature = %3.1e per ohm-m', sigma);\n",
+"\n",
+"\n",
+"// Result\n",
+"// The ratio of drift speed to rms speed is = 1.6e-009\n",
+"// Average time between two collisions = 2.23e-015 s\n",
+"// Conductivity of copper at room temperature = 5.3e+006 per ohm-m "
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 12.2: Conduction_in_diamond.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"// Scilab code Ex12.2: Pg 429 (2005)\n",
+"clc; clear;\n",
+"V = 7;    // Energy gap, V\n",
+"L = 5e-08;   // Mean free path , m\n",
+"E = V/L;   // Electric field, V/m\n",
+"printf('\nThe electric field strength required to produce conduction in diamond = %3.1fe+08 V/m', E*1e-08);\n",
+"printf('\n');\n",
+"\n",
+"// Result\n",
+"// The electric field strength required to produce conduction in diamond = 1.4e+08 V/m"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 12.3: Forward_and_reverse_currents_in_diode.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"// Scilab code Ex12.3: Pg 436 (2005)\n",
+"clc; clear;\n",
+"e_V = 1;    // Energy applied to diode, eV\n",
+"k_B_T = 0.025;   // Product of Boltzmann constant and temperature, eV\n",
+"// For simplicity let (q*V)/(k_B*T) = x\n",
+"x = (e_V/(k_B_T));\n",
+"I_f_r = (exp(x)-1)/(exp(-x)-1);   // Ratio of forward current to reverse current in diode\n",
+"printf('\nThe ratio of forward current to reverse current in diode = %3.1fe+17', I_f_r*1e-17);\n",
+"\n",
+"// Result\n",
+"// The ratio of forward current to reverse current in diode = -2.4e+17 "
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}