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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 9 : Microstructural Examination and Non-Destructive Testing"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      "Example 9.1 pageno : 228"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "import math \n",
+      "\n",
+      "# Variables\n",
+      "n = 2.**(12-1);\t\t\t#astm no. = 12\n",
+      "\t\n",
+      "# Calculations\n",
+      "#1 sq inch = 645mm**2\n",
+      "d = 1./math.sqrt((n/645)*10**4);\t\t\t#grain diameter in mm\n",
+      "\n",
+      "# Results\n",
+      "print \"grain diameter for ASTM no. 12 (in mm)  =  %.4f mm\"%d\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "grain diameter for ASTM no. 12 (in mm)  =  0.0056 mm\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      "Example 9.2 pageno : 228"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "# Variables\n",
+      "n = 2**(5-1);\t\t\t#astm no.  =  5 in grain/inch**2\n",
+      "\n",
+      "# Calculations\n",
+      "#Lineal and Areal magnifications are related as *100 Lineal  =  *10000 Areal\n",
+      "x = n/(.01*.01);\t\t\t#in grain/inch**2 at 1 x.\n",
+      "a = 1./x;       \t\t\t#average area in inch**2\n",
+      "a1 = 2.54*2.54*a;\t\t\t#average area in cm.**2\n",
+      "l = math.sqrt(x);\t\t\t#grains/inch of length\n",
+      "s = (1./l)**2;  \t\t\t#surface area in sq inch\n",
+      "s6 = 6.*s;\t\t        \t#surface area of 6 surfaces of cubic grain in sq inch\n",
+      "b = 0.5*s6*(l**3);\t\t\t#total boundary area in sq inch\n",
+      "b1 = b/(2.54);\t\t\t    #total boundary area in sq cm\n",
+      "\n",
+      "# Results\n",
+      "print \"Average area of one grain (in sq cm)  =  %.2e cm**2\"%a1\n",
+      "print \"Boundary Area per cubic centimetre of steel (in sq cm)  =  %.1f cm**2\"%b1\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Average area of one grain (in sq cm)  =  4.03e-05 cm**2\n",
+        "Boundary Area per cubic centimetre of steel (in sq cm)  =  472.4 cm**2\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
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