core_shell_microgelscostrafo411magnetic_modelrelease_v0.94release_v0.95ticket-1257-vesicle-productticket_1156ticket_1265_superballticket_822_more_unit_tests
Last change
on this file since d119f34 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:
1.4 KB
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Line | |
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1 | static |
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2 | double multilayer_vesicle_kernel(double q, |
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3 | double volfraction, |
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4 | double radius, |
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5 | double thick_shell, |
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6 | double thick_solvent, |
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7 | double sld_solvent, |
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8 | double sld, |
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9 | double n_pairs) |
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10 | { |
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11 | //calculate with a loop, two shells at a time |
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12 | int ii = 0; |
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13 | double fval = 0.0; |
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14 | double voli = 0.0; |
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15 | const double sldi = sld_solvent-sld; |
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16 | |
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17 | do { |
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18 | double ri = radius + (double)ii*(thick_shell + thick_solvent); |
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19 | |
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20 | // layer 1 |
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21 | voli = 4.0*M_PI/3.0*ri*ri*ri; |
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22 | fval += voli*sldi*sph_j1c(ri*q); |
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23 | |
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24 | ri += thick_shell; |
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25 | |
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26 | // layer 2 |
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27 | voli = 4.0*M_PI/3.0*ri*ri*ri; |
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28 | fval -= voli*sldi*sph_j1c(ri*q); |
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29 | |
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30 | //do 2 layers at a time |
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31 | ii += 1; |
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32 | |
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33 | } while(ii <= n_pairs-1); //change to make 0 < n_pairs < 2 correspond to |
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34 | //unilamellar vesicles (C. Glinka, 11/24/03) |
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35 | |
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36 | fval *= volfraction*1.0e-4*fval/voli; |
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37 | |
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38 | return(fval); |
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39 | } |
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40 | |
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41 | static |
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42 | double Iq(double q, |
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43 | double volfraction, |
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44 | double radius, |
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45 | double thick_shell, |
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46 | double thick_solvent, |
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47 | double sld_solvent, |
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48 | double sld, |
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49 | double n_pairs) |
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50 | { |
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51 | return multilayer_vesicle_kernel(q, |
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52 | volfraction, |
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53 | radius, |
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54 | thick_shell, |
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55 | thick_solvent, |
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56 | sld_solvent, |
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57 | sld, |
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58 | n_pairs); |
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59 | } |
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60 | |
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