core_shell_microgelscostrafo411magnetic_modelticket-1257-vesicle-productticket_1156ticket_1265_superballticket_822_more_unit_tests
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Last change
on this file since 925ad6e 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:
1.9 KB
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| Rev | Line | |
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| [577912b] | 1 | double form_volume(double radius, double num_pearls); |
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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 edge_sep, |
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| 6 | double num_pearls, |
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| 7 | double pearl_sld, |
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| 8 | double solvent_sld); |
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| 9 | |
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| 10 | double linear_pearls_kernel(double q, |
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| 11 | double radius, |
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| 12 | double edge_sep, |
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| 13 | double num_pearls, |
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| 14 | double pearl_sld, |
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| 15 | double solvent_sld); |
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| 16 | |
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| 17 | |
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| 18 | double form_volume(double radius, double num_pearls) |
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| 19 | { |
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| 20 | // Pearl volume |
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| [3a48772] | 21 | double pearl_vol = M_4PI_3 * cube(radius); |
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| [577912b] | 22 | // Return total volume |
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| 23 | return num_pearls * pearl_vol;; |
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| 24 | } |
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| 25 | |
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| 26 | double linear_pearls_kernel(double q, |
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| 27 | double radius, |
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| 28 | double edge_sep, |
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| 29 | double num_pearls, |
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| 30 | double pearl_sld, |
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| 31 | double solvent_sld) |
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| 32 | { |
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| 33 | double n_contrib; |
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| 34 | //relative sld |
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| 35 | double contrast_pearl = pearl_sld - solvent_sld; |
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| 36 | //each volume |
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| [3a48772] | 37 | double pearl_vol = M_4PI_3 * cube(radius); |
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| [577912b] | 38 | //total volume |
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| 39 | double tot_vol = num_pearls * pearl_vol; |
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| 40 | //mass |
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| 41 | double m_s = contrast_pearl * pearl_vol; |
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| 42 | //center to center distance between the neighboring pearls |
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| 43 | double separation = edge_sep + 2.0 * radius; |
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| 44 | |
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| 45 | //sine functions of a pearl |
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| [925ad6e] | 46 | double psi = sas_3j1x_x(q * radius); |
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| [577912b] | 47 | |
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| 48 | // N pearls contribution |
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| 49 | int n_max = num_pearls - 1; |
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| 50 | n_contrib = num_pearls; |
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| 51 | for(int num=1; num<=n_max; num++) { |
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| [1e7b0db0] | 52 | n_contrib += (2.0*(num_pearls-num)*sas_sinx_x(q*separation*num)); |
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| [577912b] | 53 | } |
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| 54 | // form factor for num_pearls |
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| [4962519] | 55 | double form_factor = 1.0e-4 * n_contrib * square(m_s*psi) / tot_vol; |
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| [577912b] | 56 | |
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| 57 | return form_factor; |
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| 58 | } |
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| 59 | |
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| 60 | double Iq(double q, |
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| 61 | double radius, |
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| 62 | double edge_sep, |
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| 63 | double num_pearls, |
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| 64 | double pearl_sld, |
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| 65 | double solvent_sld) |
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| 66 | { |
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| 67 | |
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| 68 | double result = linear_pearls_kernel(q, |
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| 69 | radius, |
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| 70 | edge_sep, |
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| 71 | num_pearls, |
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| 72 | pearl_sld, |
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| 73 | solvent_sld); |
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| 74 | |
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| 75 | return result; |
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| 76 | } |
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