core_shell_microgelscostrafo411magnetic_modelrelease_v0.94release_v0.95ticket-1257-vesicle-productticket_1156ticket_1265_superballticket_822_more_unit_tests
Last change
on this file since 6abd46f was
9c461c7,
checked in by piotr, 8 years ago
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- Code review from PK: renamed J1c to sph_j1c
- Fixed mass_fractal
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-
Property mode set to
100644
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File size:
1.5 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 | double Iqxy(double qx, double qy, |
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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 | static double _surface_fractal_kernel(double q, |
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14 | double radius, |
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15 | double surface_dim, |
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16 | double cutoff_length) |
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17 | { |
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18 | double pq, sq, mmo, result; |
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19 | |
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20 | //Replaced the original formula with Taylor expansion near zero. |
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21 | //pq = pow((3.0*(sin(q*radius) - q*radius*cos(q*radius))/pow((q*radius),3)),2); |
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22 | |
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23 | pq = sph_j1c(q*radius); |
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24 | pq = pq*pq; |
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25 | |
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26 | //calculate S(q) |
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27 | mmo = 5.0 - surface_dim; |
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28 | sq = exp(lanczos_gamma(mmo))*sin(-(mmo)*atan(q*cutoff_length)); |
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29 | sq *= pow(cutoff_length, mmo); |
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30 | sq /= pow((1.0 + (q*cutoff_length)*(q*cutoff_length)),(mmo/2.0)); |
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31 | sq /= q; |
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32 | |
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33 | //combine and return |
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34 | result = pq * sq; |
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35 | |
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36 | return result; |
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37 | } |
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38 | double form_volume(double radius){ |
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39 | |
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40 | return 1.333333333333333*M_PI*radius*radius*radius; |
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41 | } |
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42 | |
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43 | double Iq(double q, |
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44 | double radius, |
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45 | double surface_dim, |
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46 | double cutoff_length |
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47 | ) |
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48 | { |
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49 | return _surface_fractal_kernel(q, radius, surface_dim, cutoff_length); |
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50 | } |
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51 | |
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52 | // Iqxy is never called since no orientation or magnetic parameters. |
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53 | double Iqxy(double qx, double qy, |
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54 | double radius, |
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55 | double surface_dim, |
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56 | double cutoff_length) |
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57 | { |
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58 | double q = sqrt(qx*qx + qy*qy); |
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59 | return _surface_fractal_kernel(q, radius, surface_dim, cutoff_length); |
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60 | } |
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61 | |
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