core_shell_microgelscostrafo411magnetic_modelrelease_v0.94release_v0.95ticket-1257-vesicle-productticket_1156ticket_1265_superballticket_822_more_unit_tests
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1 | double form_volume(void); |
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2 | |
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3 | double Iq(double q, double radius2, double arms); |
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4 | |
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5 | double Iqxy(double qx, double qy, double radius2, double arms); |
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6 | |
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7 | |
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8 | static double _mass_fractal_kernel(double q, double radius2, double arms) |
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9 | { |
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10 | |
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11 | double u_2 = radius2 * pow(q,2); |
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12 | double v = u_2 * arms / (3.0 * arms - 2.0); |
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13 | |
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14 | double term1 = v - 1.0 + exp(-v); |
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15 | double term2 = ((arms - 1.0)/2.0)* pow((1.0 - exp(-v)),2.0); |
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16 | |
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17 | return (2.0 * (term1 + term2)) / (arms * pow(v,2.0)); |
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18 | |
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19 | } |
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20 | |
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21 | double form_volume(void) |
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22 | { |
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23 | return 1.0; |
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24 | } |
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25 | |
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26 | double Iq(double q, double radius2, double arms) |
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27 | { |
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28 | return _mass_fractal_kernel(q, radius2, arms); |
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29 | } |
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30 | |
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31 | // Iqxy is never called since no orientation or magnetic parameters. |
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32 | double Iqxy(double qx, double qy, double radius2, double arms) |
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33 | { |
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34 | double q = sqrt(qx*qx + qy*qy); |
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35 | return _mass_fractal_kernel(q, radius2, arms); |
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36 | } |
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37 | |
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