Added(A)/Deleted(D) following books

 A  f_by_df/chapter03_16.ipynb
A  f_by_df/chapter03_16_1.ipynb
A  f_by_df/screenshots/1.png
A  f_by_df/screenshots/2.png
A  f_by_df/screenshots/3.png
A  f_by_df/screenshots/image.png
A  f_by_df/screenshots/image_1.png
A  f_by_df/screenshots/image_2.png
A  sample_notebooks/SufiyanSiddique/Chapter2.ipynb
A  sample_notebooks/chayas/DimensionsSystemUnits.ipynb

2 files changed, 426 insertions, 0 deletions

diff --git a/sample_notebooks/SufiyanSiddique/Chapter2.ipynb b/sample_notebooks/SufiyanSiddique/Chapter2.ipynb
new file mode 100644
index 00000000..7a4bda7a
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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Chapter 2 : Amplification"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### Example 6.1, page 92"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 27,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Ouput voltage of and amplifier = 15.2 V\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Initialisation\n",
+    "Ri=1000                    #Input Resistance of amplifier in Ohm\n",
+    "Rs=100                    #Output Resistance of sensor in Ohm\n",
+    "Rl=50                     #Load Resistance\n",
+    "Ro=10                    #Output Resistance of amplifier in Ohm\n",
+    "Av=10                     #Voltage gain\n",
+    "Vs=2                       #Sensor voltage\n",
+    "\n",
+    "#Calculation\n",
+    "Vi=(Ri*Vs)*(Rs+Ri)**-1               #Input Voltage of Amplifier\n",
+    "Vo=Av*Vi*Rl/(Ro+Rl)               #Output Voltage of Amplifier\n",
+    "\n",
+    "#Result\n",
+    "print'Ouput voltage of and amplifier = %.1f V'%Vo\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### Example 6.2, page 93"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 10,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Voltage Gain, Av = 8.35\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Initialisation\n",
+    "Vo=15.2               #Output Voltage of Amplifier\n",
+    "Vi=1.82               #Input Voltage of Amplifier\n",
+    "\n",
+    "#Calculation\n",
+    "Av=Vo/Vi                     #Voltage gain\n",
+    "\n",
+    "#Result\n",
+    "print'Voltage Gain, Av = %.2f'%Av"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### Example 6.3, page 94"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 11,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Ouput voltage of and amplifier = 20.0 V\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Initialisation\n",
+    "Av=10                     #Voltage gain\n",
+    "Vi=2                      #Input Voltage of Amplifier\n",
+    "Rl=50                     #Load Resistance\n",
+    "Ro=0                    #Output Resistance of amplifier in Ohm\n",
+    "\n",
+    "\n",
+    "#Calculation\n",
+    "Vo=Av*Vi*Rl/(Ro+Rl)               #Output Voltage of Amplifier\n",
+    "\n",
+    "#Result\n",
+    "print'Ouput voltage of and amplifier = %.1f V'%Vo"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### Example 6.4, page 96"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 13,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Output Power, Po = 4.6 W\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Initialisation\n",
+    "Vo=15.2                               #Output Voltage\n",
+    "Rl=50                                 #Load Resistance\n",
+    "\n",
+    "#Calculation \n",
+    "Po=(Vo**2)/Rl                           #Output Power\n",
+    "\n",
+    "#Result\n",
+    "print'Output Power, Po = %.1f W'%Po"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### Example 6.5, page 98"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 29,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Power Gain, Ap = 1395\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Initialisation\n",
+    "Vi=1.82                     #Input Voltage of Amplifier\n",
+    "Ri=1000                    #Input Resistance of amplifier in Ohm\n",
+    "Vo=15.2                     #Output Voltage of Amplifier\n",
+    "Rl=50                     #Load Resistance\n",
+    "\n",
+    "\n",
+    "#Calculation\n",
+    "Pi=(Vi**2)*Ri**-1                #Input Power in Watt\n",
+    "Po=(Vo**2)*Rl**-1                #Output Power in Watt\n",
+    "Ap=Po*Pi**-1                   #Power Gain\n",
+    "\n",
+    "\n",
+    "#Result\n",
+    "print'Power Gain, Ap = %d'%Ap\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### Example 6.6, page 99"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 30,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Power Gain (dB) = 31.5 dB\n"
+     ]
+    }
+   ],
+   "source": [
+    "import math \n",
+    "\n",
+    "#Initialisation\n",
+    "P=1400                          #Power gain\n",
+    "\n",
+    "#Calculation\n",
+    "pdb=10*math.log10(P)                 #Power Gain in dB\n",
+    "\n",
+    "#Result\n",
+    "print'Power Gain (dB) = %.1f dB'%pdb\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": []
+  }
+ ],
+ "metadata": {
+  "anaconda-cloud": {},
+  "kernelspec": {
+   "display_name": "Python [Root]",
+   "language": "python",
+   "name": "Python [Root]"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.12"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}
diff --git a/sample_notebooks/chayas/DimensionsSystemUnits.ipynb b/sample_notebooks/chayas/DimensionsSystemUnits.ipynb
new file mode 100644
index 00000000..cdb3b1c1
--- /dev/null
+++ b/sample_notebooks/chayas/DimensionsSystemUnits.ipynb
@@ -0,0 +1,169 @@
+{
+ "metadata": {
+  "name": "DimensionsSystemUnits"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": "Dimensions and systems of units"
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": "Ex.1.1"
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "# Ex1.1 pageno 12\npg=40  #negative pressure\npatom=47.2  #atom pressure\npa=patom-pg  #absolute pressure of 6000\nprint \" pa = \",round(pa,1), \"kPa\" ",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": " pa =  7.2 kPa\n"
+      }
+     ],
+     "prompt_number": 8
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": "Ex 1.2"
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "#Ex 1.2 pageno 13\nsigma=0.073 #N/m\nga= 9800 #density\nD= 2*10**-3\nh=(4*sigma)/(ga*D)*10**3\nprint '%s % 2g' %(\"\\n h(meter)= \",h), \"mm\"",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "\n h(meter)=   14.898 mm\n"
+      }
+     ],
+     "prompt_number": 94
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": "Ex 1.3"
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "# Ex 1.3 pageno 13 \n# from table given in textbook\nimport math\nz=10000 #meter\nT=223.3 #kelvin\nr=287\nk=1.4\nc=math.sqrt(k*r*T)\nprint \" velocity of sound C= \",round(c,1), \"m/s\" \nv=(800*1000) # given speed of aircraft flies 800 km/hr\nt=3600\nspeed= v/t\nprint '%s %.1f %s' %(\"speed of aircraft v= \",speed,\"m/s\" )\nm=speed/c\nprint '%s %.2f'%(\"mach number of aircraft M= \",m)",
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": "*"
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": "EX 1.4"
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "# pageno 13\ns=0.91 #specific gravity of water\nd=1000 #density of water\np=s*d # fluid density of water\nprint \"fluid density\",p,\"kg/m3\"\nd1=25*10**-3\nv1=2.6\nmu=0.38\nre=(p*d1*v1)/mu\nprint '%s %.1f' %(\"Reynolds number Re is \",re)",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "fluid density 910.0 kg/m3\nReynolds number Re is  155.7\n"
+      }
+     ],
+     "prompt_number": 50
+    },
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": "Ex 1.5"
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "# page no 14\nb=3 #pressure bar of gauge\nv2=101.3 #conversion value \nap=(b*v2)+(v2) # absolute pressure in the tank in kpa\nprint '%s %.1f %s' %(\"Absolute pressure in the tank in kpa =\",ap,\"kPa\")\np=ap*10**3\nR=287 # R Radius of Surface tension\nT=288 # Temperature in kelvin\np1=p/(R*T)\nprint '%s %.1f %s' %(\"density p= \",p1,\"Kg/m3\")\nv=0.85 # volume of airtank in m3\ng= 9.8 # gravational force \nw=p1*v*g\nprint '%s %.2f %s'%(\"Weight of air W = pvg= \",w,\"Kg\")",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "Absolute pressure in the tank in kpa = 405.2 kPa\ndensity p=  4.9 Kg/m3\nWeight of air W = pvg=  40.84 Kg\n"
+      }
+     ],
+     "prompt_number": 57
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": "Ex 1.6"
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "#page no 14 \nR=1*10**-3 # radius in meter\nsigma1=72.7*10**-3 # N/M\nE=(2*sigma1)/R\nprint '%s %.1f %s' %(\" Excess pressure p= \",E,\"N/m2\")",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": " Excess pressure p=  145.4 N/m2\n"
+      }
+     ],
+     "prompt_number": 61
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": "Ex 1.7\n"
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "#page no 15\n# derivation of equation  by substuting  so no calculations \nprint \"shear stress t=-BD/4\"\nprint \" Also at position r=D/4;t=-BD/8\"",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "shear stress t=-BD/4\n Also at position r=D/4;t=-BD/8\n"
+      }
+     ],
+     "prompt_number": 63
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "",
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
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