core_shell_microgelsmagnetic_modelticket-1257-vesicle-productticket_1156ticket_1265_superballticket_822_more_unit_tests
Last change
on this file since 393facf was
925ad6e,
checked in by wojciech, 7 years ago
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sph_j1c translated to sas_3j1x_x
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-
Property mode set to
100644
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File size:
1.1 KB
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1 | /******************************************************************* |
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2 | |
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3 | core_shell_kernel |
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4 | |
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5 | Form factor used in core_shell and fractal_core_shell |
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6 | |
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7 | ********************************************************************/ |
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8 | static |
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9 | double core_shell_kernel(double q, |
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10 | double radius, |
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11 | double thickness, |
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12 | double core_sld, |
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13 | double shell_sld, |
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14 | double solvent_sld) { |
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15 | // Core first, then add in shell |
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16 | const double core_qr = q * radius; |
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17 | const double core_contrast = core_sld - shell_sld; |
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18 | const double core_bes = sas_3j1x_x(core_qr); |
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19 | const double core_volume = M_4PI_3 * cube(radius); |
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20 | double f = core_volume * core_bes * core_contrast; |
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21 | |
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22 | // Now the shell |
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23 | const double shell_qr = q * (radius + thickness); |
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24 | const double shell_contrast = shell_sld - solvent_sld; |
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25 | const double shell_bes = sas_3j1x_x(shell_qr); |
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26 | const double shell_volume = M_4PI_3 * cube(radius + thickness); |
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27 | f += shell_volume * shell_bes * shell_contrast; |
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28 | return f * f * 1.0e-4; |
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29 | } |
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