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diff --git a/_A_Textbook_of_Electrical_Technology:Transmission,Distribution_And_Utilisation(Vol_III)_by_B.L.Thareja_and_A.K.Thareja/screenshots/figure_1.png b/A_Textbook_of_Electrical_Technology:Transmission,Distribution_And_Utilisation(Vol_III)_by_B.L.Thareja_and_A.K.Thareja/screenshots/figure_1.png
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diff --git a/_A_Textbook_of_Electrical_Technology:Transmission,Distribution_And_Utilisation(Vol_III)_by_B.L.Thareja_and_A.K.Thareja/screenshots/figure_2.png b/A_Textbook_of_Electrical_Technology:Transmission,Distribution_And_Utilisation(Vol_III)_by_B.L.Thareja_and_A.K.Thareja/screenshots/figure_2.png
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diff --git a/_A_Textbook_of_Electrical_Technology:Transmission,Distribution_And_Utilisation(Vol_III)_by_B.L.Thareja_and_A.K.Thareja/screenshots/figure_3.png b/A_Textbook_of_Electrical_Technology:Transmission,Distribution_And_Utilisation(Vol_III)_by_B.L.Thareja_and_A.K.Thareja/screenshots/figure_3.png
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--- a/_A_Textbook_of_Electrical_Technology:Transmission,Distribution_And_Utilisation(Vol_III)_by_B.L.Thareja_and_A.K.Thareja/screenshots/figure_3.png
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diff --git a/Engineering_Mechanics_by_A._K._Tayal/README.txt b/Engineering_Mechanics_by_A._K._Tayal/README.txt
new file mode 100644
index 00000000..5df15513
--- /dev/null
+++ b/Engineering_Mechanics_by_A._K._Tayal/README.txt
@@ -0,0 +1,10 @@
+Contributed By: Aditya R
+Course: btech
+College/Institute/Organization: CMR Institute of Technology
+Department/Designation: Electronics Engineering
+Book Title: Engineering Mechanics
+Author: A. K. Tayal
+Publisher: Umesh Publications ,Darya Ganj, Delhi
+Year of publication: 2010
+Isbn: 9789380117386
+Edition: 14
+\ No newline at end of file
diff --git a/basic_electrical_engineering_by_nagsarkar_and_sukhija/README.txt b/basic_electrical_engineering_by_nagsarkar_and_sukhija/README.txt
new file mode 100644
index 00000000..fe6f3774
--- /dev/null
+++ b/basic_electrical_engineering_by_nagsarkar_and_sukhija/README.txt
@@ -0,0 +1,10 @@
+Contributed By: Namratha  Reddy
+Course: be
+College/Institute/Organization: Stanley college of engineering and technology for women
+Department/Designation: computer science engineering
+Book Title: basic electrical engineering
+Author: nagsarkar and sukhija
+Publisher: Oxford university and press, New Delhi
+Year of publication: 2011
+Isbn: 978-0-19-569142-9
+Edition: 2nd edition
+\ No newline at end of file
diff --git a/sample_notebooks/DayanidhiKrishna/Chapter2.ipynb b/sample_notebooks/DayanidhiKrishna/Chapter2.ipynb
new file mode 100644
index 00000000..bb11612c
--- /dev/null
+++ b/sample_notebooks/DayanidhiKrishna/Chapter2.ipynb
@@ -0,0 +1,231 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Chapter 2 Antenna Fundamentals"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## 2.1 Calculation of Etheta"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      " Distance between point's is m 200 m\n",
+      " the wavelength is  10 m\n",
+      " the current element is  0.00030000000000000003 A/m\n",
+      " Etheta value is V/m 0.2826\n"
+     ]
+    }
+   ],
+   "source": [
+    "from __future__ import division\n",
+    "import math\n",
+    "\n",
+    "# Etheta = 60∗ pi ∗ I ( dl / lambda ) ∗ ( sin(theta) / r) where thetha = 90\n",
+    "r =200;\n",
+    "print ( \" Distance between point's is m\" ,r ,'m') \n",
+    "lam =10;\n",
+    "print ( \" the wavelength is \" , lam ,'m') ;\n",
+    "idl =3*10**-4;\n",
+    "print ( \" the current element is \" , idl ,\"A/m\") ;\n",
+    "Etheta =60*3.14*3*10** -3/2\n",
+    "print(\" Etheta value is V/m\",Etheta)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## 2.2 Calculation of directive gain"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "radiation resistance is  72 ohm\n",
+      "the Loss resistance is  8 ohm\n",
+      "the power gain of antenna is  30\n",
+      "the Directivity gain is  33.333333333333336\n",
+      "the Directivity gain in db is given by  15.228787452803376\n"
+     ]
+    }
+   ],
+   "source": [
+    "from __future__ import division\n",
+    "import math\n",
+    "\n",
+    "#etta=Prad/Prad+Ploss=Rrad/Rrad+Rloss\n",
+    "Rrad=72;\n",
+    "print(\"radiation resistance is \",Rrad,\"ohm\");\n",
+    "Rloss=8;\n",
+    "ettar=72/(72+8);\n",
+    "print(\"the Loss resistance is \",Rloss,\"ohm\");\n",
+    "Gpmax=30;\n",
+    "print(\"the power gain of antenna is \",Gpmax);\n",
+    "Gdmax=Gpmax/ettar;\n",
+    "Gdmax1=10 *math.log10(Gdmax);#in db\n",
+    "print(\"the Directivity gain is \",Gdmax);\n",
+    "print(\"the Directivity gain in db is given by \",Gdmax1);"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## 2.3 Radiation Resistance calculation"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "the elemental length is given by  0.1\n",
+      "the radiation resistance is  7.895683520871488 ohm\n"
+     ]
+    }
+   ],
+   "source": [
+    "from __future__ import division\n",
+    "import math\n",
+    "\n",
+    "#Rrad=80*pi^2*(dl/lambda)^2\n",
+    "dl=0.1;\n",
+    "print(\"the elemental length is given by \",dl);\n",
+    "Rrad=80*(math.pi)**2*(0.1)**2;\n",
+    "print(\"the radiation resistance is \",Rrad,\"ohm\");\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## 2.4 Rms current calculation"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "the wavelength is  3.0 m\n",
+      "the Radiated power is  100 W\n",
+      "the elemental length is  0.01 m\n",
+      "the Irms current is  106.76438151257656 A\n"
+     ]
+    }
+   ],
+   "source": [
+    "from __future__ import division\n",
+    "import math\n",
+    "\n",
+    "#Prad=80*(pi)**2*(dl/lambda)*(Irms)**2;\n",
+    "frequency=100*10**6;\n",
+    "lamda=(3*10**8)/(100*10**6); #lamda=c/f;\n",
+    "print(\"the wavelength is \",lamda,\"m\");\n",
+    "Prad=100;\n",
+    "print(\"the Radiated power is \",Prad,\"W\");\n",
+    "dl=0.01;\n",
+    "print(\"the elemental length is \",dl,\"m\");\n",
+    "Irms2=(3/0.01)**2*100/(80*(math.pi)**2);\n",
+    "Irms=math.sqrt(Irms2);\n",
+    "print(\"the Irms current is \",Irms,\"A\")"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## 2.5 Effective aperture calculation"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "the electric field is  0.05 V/m\n",
+      "the average power is  3.315727981081154e-06 W\n",
+      "the maximum effective aperture area is  0.603318250377074 m^2\n"
+     ]
+    }
+   ],
+   "source": [
+    "from __future__ import division\n",
+    "import math\n",
+    "\n",
+    "#Pavg=0.5*|E|^2/etta0,Prmax=2*10^-6W,Aem=Prmax/Pavg\n",
+    "\n",
+    "E=50*10**-3;\n",
+    "Etta0=120*(math.pi);\n",
+    "print(\"the electric field is \",E,\"V/m\");\n",
+    "Pavg=0.5*(50*10**-3)**2/(120*(math.pi));\n",
+    "print(\"the average power is \",Pavg,\"W\");\n",
+    "Aem=(2*10**-6)/(3.315*10**-6);\n",
+    "print(\"the maximum effective aperture area is \",Aem,\"m^2\");\n"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.5.2"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 1
+}