core_shell_microgelscostrafo411magnetic_modelrelease_v0.94release_v0.95ticket-1257-vesicle-productticket_1156ticket_1265_superballticket_822_more_unit_tests
Last change
on this file since 6e5b2a7 was
2c74c11,
checked in by Paul Kienzle <pkienzle@…>, 8 years ago
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implicit Iqxy; fix divide by 0 for q=0
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-
Property mode set to
100644
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File size:
1.0 KB
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1 | double form_volume(double radius); |
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2 | |
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3 | double Iq(double q, |
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4 | double radius, |
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5 | double surface_dim, |
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6 | double cutoff_length); |
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7 | |
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8 | static double _surface_fractal_kernel(double q, |
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9 | double radius, |
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10 | double surface_dim, |
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11 | double cutoff_length) |
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12 | { |
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13 | double pq, sq, mmo, result; |
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14 | |
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15 | //Replaced the original formula with Taylor expansion near zero. |
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16 | //pq = pow((3.0*(sin(q*radius) - q*radius*cos(q*radius))/pow((q*radius),3)),2); |
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17 | |
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18 | pq = sph_j1c(q*radius); |
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19 | pq = pq*pq; |
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20 | |
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21 | //calculate S(q) |
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22 | mmo = 5.0 - surface_dim; |
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23 | sq = sas_gamma(mmo)*sin(-(mmo)*atan(q*cutoff_length)); |
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24 | sq *= pow(cutoff_length, mmo); |
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25 | sq /= pow((1.0 + (q*cutoff_length)*(q*cutoff_length)),(mmo/2.0)); |
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26 | sq /= q; |
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27 | |
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28 | //combine and return |
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29 | result = pq * sq; |
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30 | |
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31 | return result; |
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32 | } |
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33 | double form_volume(double radius){ |
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34 | |
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35 | return 1.333333333333333*M_PI*radius*radius*radius; |
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36 | } |
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37 | |
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38 | double Iq(double q, |
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39 | double radius, |
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40 | double surface_dim, |
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41 | double cutoff_length |
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42 | ) |
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43 | { |
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44 | return _surface_fractal_kernel(q, radius, surface_dim, cutoff_length); |
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45 | } |
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