1 | double form_volume(double length, double kuhn_length, double radius); |
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2 | double Iq(double q, double length, double kuhn_length, double radius, |
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3 | double axis_ratio, double sld, double solvent_sld); |
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4 | double flexible_cylinder_ex_kernel(double q, double length, double kuhn_length, |
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5 | double radius, double axis_ratio, double sld, |
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6 | double solvent_sld); |
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7 | double elliptical_crosssection(double q, double a, double b); |
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8 | |
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9 | double form_volume(double length, double kuhn_length, double radius) |
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10 | { |
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11 | return 1.0; |
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12 | } |
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13 | |
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14 | double |
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15 | elliptical_crosssection(double q, double a, double b) |
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16 | { |
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17 | double sum=0.0; |
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18 | |
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19 | for(int i=0;i<GAUSS_N;i++) { |
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20 | const double zi = ( GAUSS_Z[i] + 1.0 )*M_PI_4; |
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21 | double sn, cn; |
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22 | SINCOS(zi, sn, cn); |
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23 | const double arg = q*sqrt(a*a*sn*sn + b*b*cn*cn); |
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24 | const double yyy = sas_2J1x_x(arg); |
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25 | sum += GAUSS_W[i] * yyy * yyy; |
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26 | } |
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27 | sum *= 0.5; |
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28 | return(sum); |
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29 | |
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30 | } |
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31 | |
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32 | double flexible_cylinder_ex_kernel(double q, |
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33 | double length, |
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34 | double kuhn_length, |
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35 | double radius, |
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36 | double axis_ratio, |
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37 | double sld, |
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38 | double solvent_sld) |
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39 | { |
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40 | |
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41 | double flex,crossSect, cont; |
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42 | |
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43 | cont = sld - solvent_sld; |
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44 | crossSect = elliptical_crosssection(q,radius,(radius*axis_ratio)); |
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45 | |
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46 | flex = Sk_WR(q,length,kuhn_length); |
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47 | flex *= crossSect; |
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48 | flex *= M_PI*radius*radius*axis_ratio*axis_ratio*length; |
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49 | flex *= cont*cont; |
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50 | flex *= 1.0e-4; |
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51 | |
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52 | return flex; |
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53 | } |
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54 | |
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55 | double Iq(double q, |
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56 | double length, |
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57 | double kuhn_length, |
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58 | double radius, |
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59 | double axis_ratio, |
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60 | double sld, |
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61 | double solvent_sld) |
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62 | { |
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63 | |
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64 | double result = flexible_cylinder_ex_kernel(q, |
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65 | length, |
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66 | kuhn_length, |
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67 | radius, |
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68 | axis_ratio, |
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69 | sld, |
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70 | solvent_sld); |
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71 | |
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72 | return result; |
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73 | } |
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74 | |
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