Merge pull request #1 from debashisdeb/master

removing problem statements from all the chapters to avoid copyright violations

1 files changed, 0 insertions, 24 deletions

diff --git a/Materials_science_and_engineering_an_introduction/CH14.ipynb b/Materials_science_and_engineering_an_introduction/CH14.ipynb
index 7ade4dbe..e860f213 100644
--- a/Materials_science_and_engineering_an_introduction/CH14.ipynb
+++ b/Materials_science_and_engineering_an_introduction/CH14.ipynb
@@ -27,11 +27,7 @@
      "cell_type": "code",

      "collapsed": false,

      "input": [

-      "#Computation of average Molecular wt and Degree of Polymerisation\n",

       "\n",

-      "#Given\n",

-      "#For different molecular wt range ,\n",

-      "#From Table 14.1 (a)\n",

       "Mi1=7500          #g/mol , Molecular wt\n",

       "Mi2=12500     \n",

       "Mi3=17500\n",

@@ -47,7 +43,6 @@
       "xi6=0.08\n",

       "xi7=0.02\n",

       "\n",

-      "#Calculation\n",

       "xM1=Mi1*xi1\n",

       "xM2=Mi2*xi2\n",

       "xM3=Mi3*xi3\n",

@@ -57,7 +52,6 @@
       "xM7=Mi7*xi7\n",

       "xM=xM1+xM2+xM3+xM4+xM5+xM6+xM7\n",

       "\n",

-      "#(b)\n",

       "nC=2          #no of carbon atoms in repeat unit\n",

       "nH=3          #no of hydrogen atoms in repeat unit\n",

       "nCl=1         #no of chlorine atoms in repeat unit\n",

@@ -67,7 +61,6 @@
       "m=nC*MwC+nH*MwH+nCl*MwCl     #Total wt for PVC\n",

       "DP=xM/m\n",

       "\n",

-      "#(c) from fig 14.3 (b)\n",

       "wi1=0.02           #weight fraction\n",

       "wi2=0.1\n",

       "wi3=0.18\n",

@@ -76,7 +69,6 @@
       "wi6=0.13\n",

       "wi7=0.02\n",

       "\n",

-      "#Calculation\n",

       "wM1=Mi1*wi1\n",

       "wM2=Mi2*wi2\n",

       "wM3=Mi3*wi3\n",

@@ -86,7 +78,6 @@
       "wM7=Mi7*wi7\n",

       "wM=wM1+wM2+wM3+wM4+wM5+wM6+wM7\n",

       "\n",

-      "#Result\n",

       "print\"(a)The no Av Molecular wt is\",xM,\"g/mol\"\n",

       "print\"(b)Degree of Polymerisation is\",round(DP,0)\n",

       "print\"(c)The weight  Av Molecular wt is\",wM,\"g/mol\"\n"

@@ -118,9 +109,7 @@
      "cell_type": "code",

      "collapsed": false,

      "input": [

-      "#Computations of the Density\n",

       "\n",

-      "#Given\n",

       "Ac=12.01       #in g/mol  Molecular weight of Carbon\n",

       "Ah=1.008       #in g/mol  molecular weight of hydrogen\n",

       "a=7.41*10**-8  #in cm\n",

@@ -128,18 +117,15 @@
       "c=2.55*10**-8  #in cm\n",

       "Na=6.023*10**23\n",

       "\n",

-      "#calculation\n",

       "Vc=a*b*c\n",

       "n=2\n",

       "A=(2*Ac)+(4*Ah)\n",

       "density_c=n*A/(Vc*Na)\n",

       "\n",

-      "#(b)Percent Crystallinity of Polyethylene\n",

       "density_a=0.870  # in g/cm**3\n",

       "density_s=0.925  # in g/cm**3\n",

       "pc=density_c*(density_s-density_a)*100/(density_s*(density_c-density_a))\n",

       "\n",

-      "#Result\n",

       "print\"(a)Density is\",round(density_c,3),\"g/cm**3\"\n",

       "print\"(b)percentage crystallinity is\",round(pc,1),\"%\"\n",

       "\n"

@@ -170,31 +156,21 @@
      "cell_type": "code",

      "collapsed": false,

      "input": [

-      "#Computations of Diffusion Flux of Carbon dioxide through Plasic Beverage Container\n",

       "\n",

-      "#function[A]= approx(V,n)\n",

-      "#    A= round(V*10**n)/10**n\n",

-      "#    funcprot(0)\n",

-      "#endfunction\n",

       "\n",

-      "#print\"\\tExample 14.3\\n\")\n",

       "\n",

-      "#a\n",

       "P1=400000.0       # in Pa  Pressure inside the bottle\n",

       "P2=400.0          # in Pa  Pressure outside the bottle\n",

       "Pm=0.23*10**-13  #Solubility Coefficient\n",

       "dx=0.05          # in cm Thickness of wall\n",

       "\n",

-      "#calculation\n",

       "J=(-Pm*(P2-P1)/dx)\n",

-      "#(b)Beverage Shell Life\n",

       "\n",

       "A=500           #surface area of bottle in cm**2\n",

       "V_lose=750.0    #cm**3 STP\n",

       "V=J*A\n",

       "t=V_lose/round(V,5)\n",

       "\n",

-      "#Result\n",

       "print\"Diffusion flux is \",round(J,9),\"cm**3 STP/cm**2-s\"\n",

       "print\"Time to escape is \",round(t/(3600*24),1),\"days\"\n",

       "\n"