core_shell_microgelscostrafo411magnetic_modelrelease_v0.94release_v0.95ticket-1257-vesicle-productticket_1156ticket_1265_superballticket_822_more_unit_tests
Last change
on this file since 9c461c7 was
9c461c7,
checked in by piotr, 8 years ago
|
- Code review from PK: renamed J1c to sph_j1c
- Fixed mass_fractal
|
-
Property mode set to
100644
|
File size:
1.5 KB
|
Rev | Line | |
---|
[da84551] | 1 | double form_volume(double radius); |
---|
| 2 | |
---|
[513efc5] | 3 | double Iq(double q, |
---|
| 4 | double radius, |
---|
| 5 | double surface_dim, |
---|
| 6 | double cutoff_length); |
---|
| 7 | |
---|
| 8 | double Iqxy(double qx, double qy, |
---|
| 9 | double radius, |
---|
| 10 | double surface_dim, |
---|
| 11 | double cutoff_length); |
---|
[da84551] | 12 | |
---|
[513efc5] | 13 | static double _surface_fractal_kernel(double q, |
---|
[da84551] | 14 | double radius, |
---|
| 15 | double surface_dim, |
---|
| 16 | double cutoff_length) |
---|
| 17 | { |
---|
| 18 | double pq, sq, mmo, result; |
---|
| 19 | |
---|
[513efc5] | 20 | //Replaced the original formula with Taylor expansion near zero. |
---|
| 21 | //pq = pow((3.0*(sin(q*radius) - q*radius*cos(q*radius))/pow((q*radius),3)),2); |
---|
| 22 | |
---|
[9c461c7] | 23 | pq = sph_j1c(q*radius); |
---|
[513efc5] | 24 | pq = pq*pq; |
---|
[da84551] | 25 | |
---|
| 26 | //calculate S(q) |
---|
| 27 | mmo = 5.0 - surface_dim; |
---|
[5c1d341] | 28 | sq = exp(lanczos_gamma(mmo))*sin(-(mmo)*atan(q*cutoff_length)); |
---|
[da84551] | 29 | sq *= pow(cutoff_length, mmo); |
---|
| 30 | sq /= pow((1.0 + (q*cutoff_length)*(q*cutoff_length)),(mmo/2.0)); |
---|
| 31 | sq /= q; |
---|
| 32 | |
---|
| 33 | //combine and return |
---|
| 34 | result = pq * sq; |
---|
| 35 | |
---|
| 36 | return result; |
---|
| 37 | } |
---|
| 38 | double form_volume(double radius){ |
---|
| 39 | |
---|
| 40 | return 1.333333333333333*M_PI*radius*radius*radius; |
---|
| 41 | } |
---|
| 42 | |
---|
| 43 | double Iq(double q, |
---|
| 44 | double radius, |
---|
| 45 | double surface_dim, |
---|
| 46 | double cutoff_length |
---|
| 47 | ) |
---|
| 48 | { |
---|
[513efc5] | 49 | return _surface_fractal_kernel(q, radius, surface_dim, cutoff_length); |
---|
[da84551] | 50 | } |
---|
| 51 | |
---|
| 52 | // Iqxy is never called since no orientation or magnetic parameters. |
---|
| 53 | double Iqxy(double qx, double qy, |
---|
| 54 | double radius, |
---|
| 55 | double surface_dim, |
---|
| 56 | double cutoff_length) |
---|
| 57 | { |
---|
| 58 | double q = sqrt(qx*qx + qy*qy); |
---|
[513efc5] | 59 | return _surface_fractal_kernel(q, radius, surface_dim, cutoff_length); |
---|
[da84551] | 60 | } |
---|
| 61 | |
---|
Note: See
TracBrowser
for help on using the repository browser.