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{
"metadata": {
"name": "Chapter 12"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": "Superconducting Materials"
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example number 12.1, Page number 356"
},
{
"cell_type": "code",
"collapsed": false,
"input": "#To calculate the critical field\n\n#importing modules\nimport math\n\n#Variable declaration\nTc=3.7; #critical temperature in K\nH0=0.0306; #magnetic field in T\nT=2; #temperature in K\n\n#Calculation\nHc=H0*(1-(T**2/Tc**2));\nHc=math.ceil(Hc*10**5)/10**5; #rounding off to 5 decimals\n\n#Result\nprint(\"critical field in T is\",Hc);\n",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "('critical field in T is', 0.02166)\n"
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example number 12.2, Page number 356"
},
{
"cell_type": "code",
"collapsed": false,
"input": "#To calculate the critical field\n\n#importing modules\nimport math\n\n#Variable declaration\nTc=7.26; #critical temperature in K\nH0=6.4*10**3; #magnetic field in T\nT=5; #temperature in K\n\n#Calculation\nHc=H0*(1-(T**2/Tc**2));\nHc=math.ceil(Hc*10**3)/10**3; #rounding off to 3 decimals\n\n#Result\nprint(\"critical field in T is\",Hc);",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "('critical field in T is', 3364.385)\n"
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example number 12.3, Page number 357"
},
{
"cell_type": "code",
"collapsed": false,
"input": "#To calculate the value of Tc\n\n#importing modules\nimport math\n\n#Variable declaration\nTc1=4.185; #critical temperature in K\nM1=199.5; #atomic mass\nM2=203.4; #atomic mass after changing\n\n#Calculation\n#according to maxwell equation Tc*M^0.5=constant\n#Tc1*M1^0.5=Tc2*M2^0.5\nTc2=(Tc1*M1**0.5)/M2**0.5;\nTc2=math.ceil(Tc2*10**6)/10**6; #rounding off to 6 decimals\n\n#Result\nprint(\"critical temperature of Hg in K is\",Tc2);\n",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "('critical temperature of Hg in K is', 4.144685)\n"
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example number 12.4, Page number 357"
},
{
"cell_type": "code",
"collapsed": false,
"input": "#To calculate the critical current density\n\n#importing modules\nimport math\n\n#Variable declaration\nd=1; #diameter of wire in mm\nT=4.2; #temperature in K\nTc=7.18; #critical temperature in K\nH0=6.5*10**4; #magnetic field\n\n#Calculation\nd=d*10**-3; #diameter in m\nR=d/2;\nHc=H0*(1-(T**2/Tc**2));\nHC=Hc/10**4;\nHC=math.ceil(HC*10**3)/10**3; #rounding off to 2 decimals\nIc=2*math.pi*R*Hc;\nIc=math.ceil(Ic*10**2)/10**2; #rounding off to 2 decimals\nA=math.pi*R**2;\nJ=Ic/A;\nJ=J/10**8;\nJ=math.ceil(J*10**5)/10**5; #rounding off to 5 decimals\n\n#Result\nprint(\"critical magnetic field at 4.2K in A/m is\",HC,\"*10**4\");\nprint(\"critical current in A is\",Ic);\nprint(\"critical current density in A/m^2 is\",J,\"*10**8\");",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "('critical magnetic field at 4.2K in A/m is', 4.276, '*10**4')\n('critical current in A is', 134.33)\n('critical current density in A/m^2 is', 1.71035, '*10**8')\n"
}
],
"prompt_number": 15
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example number 12.5, Page number 358"
},
{
"cell_type": "code",
"collapsed": false,
"input": "#To calculate the frequency of radiation\n\n#importing modules\nimport math\n\n#Variable declaration\ne=1.6*10**-19;\nh=6.626*10**-34;\nV=6; #voltage applied in micro volts\n\n#Calculation\nV=V*10**-6; #converting micro volts to volts\nnew=(2*e*V)/h;\nnew=new/10**9;\nnew=math.ceil(new*10**4)/10**4; #rounding off to 4 decimals\n\n#Result\nprint(\"frequency of ac signal in Hz is\",new,\"*10**9\");",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "('frequency of ac signal in Hz is', 2.8977, '*10**9')\n"
}
],
"prompt_number": 16
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example number 12.6, Page number 358"
},
{
"cell_type": "code",
"collapsed": false,
"input": "#To calculate the band gap\n\n#importing modules\nimport math\n\n#Variable declaration\nKb=1.38*10**-23;\nTc=7.19; #critical temperature in K\n\n#Calculation\nEg=3.5*Kb*Tc;\nEg=Eg/(1.6*10**-19); #converting J to eV\nEg=Eg*10**3; #converting eV into milli eV\nEg=math.ceil(Eg*10**3)/10**3; #rounding off to 3 decimals\n\n#Result\nprint(\"band gap of superconducting lead in meV is\",Eg);",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "('band gap of superconducting lead in meV is', 2.171)\n"
}
],
"prompt_number": 17
},
{
"cell_type": "code",
"collapsed": false,
"input": "",
"language": "python",
"metadata": {},
"outputs": []
}
],
"metadata": {}
}
]
}
|
