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diff --git a/Thermodynamics_by_Gaggioli_and_Obert/17-Gas_cycles_and_processes.ipynb b/Thermodynamics_by_Gaggioli_and_Obert/17-Gas_cycles_and_processes.ipynb
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+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 17: Gas cycles and processes"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 17.1: Efficiency_and_air_fuel_ratio_Equilibrium_calculations.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc\n",
+"clear\n",
+"//Initialization of variables\n",
+"ha=1033 //Btu/mol air\n",
+"hbd=2992 //Btu/mol air\n",
+"hc=7823 //Btu/mol air\n",
+"hdd=5142 //Btu/mol air\n",
+"Hv=2733000 //Btu/mol\n",
+"M=29\n",
+"//calculations\n",
+"Wt=hc-hdd\n",
+"Wc=ha-hbd\n",
+"Net=Wt+Wc\n",
+"Heat=hc-hbd\n",
+"etat=Net*100/Heat\n",
+"molair=Heat/Hv\n",
+"mr=molair*142/M\n",
+"Af=1/mr\n",
+"//results\n",
+"printf('\n Thermal efficiency = %.1f percent',etat)\n",
+"printf('\n Moles of fuel burned per mol of air = %.5f mol fuel/mol air',molair)\n",
+"printf('\n Mass ratio in pounds = %.5f lbm fuel/lbm air',mr)\n",
+"printf('\n Air fuel ratio = %d lbm air/lbm fuel',Af)"
+   ]
+   }
+],
+"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
+}