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+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 22: superconductivity"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 22.1: critical_field_and_transition_temperature.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 22.1 // critical field & transition temperature\n",
+"clc;\n",
+"clear;\n",
+"//given data :\n",
+"T=4.2;//to calculate critical field at T (kelvin)\n",
+"Hc1=1.4D5;// critical magnetic field in amp/m\n",
+"Hc2=4.2D5;//critical magnetic field in amp/m\n",
+"T1=14;//temperature in kelvin\n",
+"T2=13;//temperature ]in kevin \n",
+"Tc=sqrt(.5*((T2^2-T1^2)*(Hc1+Hc2)/(Hc1-Hc2)+T1^2+T2^2));// transition temperature\n",
+"H=Hc1/(1-(T1/Tc)^2);//field at 0 degree\n",
+"Hc=H*(1-(T/Tc)^2)\n",
+"disp(Tc,'transition temperature in kelvin')\n",
+"disp(Hc,'Critical field at T in amp/m')\n",
+"\n",
+"//little error due to approximations in book"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 22.2: critical_temperature.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 22.2 // critical temperature\n",
+"clc;\n",
+"clear;\n",
+"//given data :\n",
+"Tc1=4.185;//critical temperature in kelvin\n",
+"M=199.5;// isotropic mass \n",
+"M1=203.4;//isotropic mass\n",
+"Tc2=Tc1*(M/M1)^.5;// formula\n",
+"disp(Tc2,'critical temperature in kelvin') "
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 22.3: critical_current_density.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 22.3 // critical current density\n",
+"clc;\n",
+"clear;\n",
+"//given data :\n",
+"d=1D-3;//diameter of wire in m\n",
+"Ho=6.5D4;//critical field at temperature at 0k\n",
+"Tc=7.18;// critical temperature in kelvin\n",
+"T=4.2;//temperature in kelvin\n",
+"Hc=Ho*(1-(T/Tc)^2);//critical field at T kelvin\n",
+"Jc=4*Hc/d;//formula\n",
+"disp(Jc,'critical current density in A/m2')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 22.4: penetration_depth.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 22.4 // penetration depth\n",
+"clc;\n",
+"clear;\n",
+"//given data :\n",
+"w=750;// penetration depth in A\n",
+"T=3.5;// temperature in kelvin\n",
+"Tc=4.12;// critical temperature in kelvin\n",
+"d=13.55D3;//density of mercury\n",
+"N=6.023D23;// avogadro number\n",
+"M=200D-3;//molecular weight in kg \n",
+"wo=w*(1-(T/Tc)^4)^.5;//formula\n",
+"disp(wo,'penetration depth in A(angstrom)')\n",
+"//n0=d*N/M;//normal electron density at 0 degre\n",
+"//n=n0*(1-(T/Tc)^4);//electron density at T\n",
+"//disp(n)\n",
+"\n",
+"//according to question the answer is upto Wo only.\n",
+"\n",
+"\n",
+""
+   ]
+   }
+],
+"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
+}