1 | double form_volume(double radius_equat_minor, double radius_equat_major, double radius_polar); |
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2 | double Iq(double q, double sld, double sld_solvent, |
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3 | double radius_equat_minor, double radius_equat_major, double radius_polar); |
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4 | double Iqxy(double qx, double qy, double sld, double sld_solvent, |
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5 | double radius_equat_minor, double radius_equat_major, double radius_polar, double theta, double phi, double psi); |
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6 | |
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7 | //#define INVALID(v) (v.radius_equat_minor > v.radius_equat_major || v.radius_equat_major > v.radius_polar) |
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8 | |
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9 | |
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10 | double form_volume(double radius_equat_minor, double radius_equat_major, double radius_polar) |
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11 | { |
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12 | return M_4PI_3*radius_equat_minor*radius_equat_major*radius_polar; |
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13 | } |
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14 | |
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15 | double Iq(double q, |
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16 | double sld, |
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17 | double sld_solvent, |
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18 | double radius_equat_minor, |
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19 | double radius_equat_major, |
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20 | double radius_polar) |
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21 | { |
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22 | double sn, cn; |
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23 | // translate a point in [-1,1] to a point in [0, 1] |
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24 | const double zm = 0.5; |
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25 | const double zb = 0.5; |
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26 | double outer = 0.0; |
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27 | for (int i=0;i<76;i++) { |
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28 | //const double cos_alpha = (Gauss76Z[i]*(upper-lower) + upper + lower)/2; |
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29 | const double x = 0.5*(Gauss76Z[i] + 1.0); |
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30 | SINCOS(M_PI_2*x, sn, cn); |
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31 | const double acosx2 = radius_equat_minor*radius_equat_minor*cn*cn; |
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32 | const double bsinx2 = radius_equat_major*radius_equat_major*sn*sn; |
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33 | const double c2 = radius_polar*radius_polar; |
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34 | |
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35 | double inner = 0.0; |
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36 | for (int j=0;j<76;j++) { |
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37 | const double ysq = square(Gauss76Z[j]*zm + zb); |
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38 | const double t = q*sqrt(acosx2 + bsinx2*(1.0-ysq) + c2*ysq); |
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39 | const double fq = sas_3j1x_x(t); |
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40 | inner += Gauss76Wt[j] * fq * fq ; |
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41 | } |
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42 | outer += Gauss76Wt[i] * 0.5 * inner; |
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43 | } |
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44 | // translate dx in [-1,1] to dx in [lower,upper] |
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45 | const double fqsq = outer*zm; |
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46 | const double s = (sld - sld_solvent) * form_volume(radius_equat_minor, radius_equat_major, radius_polar); |
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47 | return 1.0e-4 * s * s * fqsq; |
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48 | } |
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49 | |
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50 | double Iqxy(double qx, double qy, |
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51 | double sld, |
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52 | double sld_solvent, |
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53 | double radius_equat_minor, |
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54 | double radius_equat_major, |
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55 | double radius_polar, |
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56 | double theta, |
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57 | double phi, |
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58 | double psi) |
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59 | { |
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60 | double q, calpha, cmu, cnu; |
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61 | ORIENT_ASYMMETRIC(qx, qy, theta, phi, psi, q, calpha, cmu, cnu); |
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62 | |
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63 | const double t = q*sqrt(radius_equat_minor*radius_equat_minor*cnu*cnu |
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64 | + radius_equat_major*radius_equat_major*cmu*cmu |
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65 | + radius_polar*radius_polar*calpha*calpha); |
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66 | const double fq = sas_3j1x_x(t); |
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67 | const double s = (sld - sld_solvent) * form_volume(radius_equat_minor, radius_equat_major, radius_polar); |
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68 | |
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69 | return 1.0e-4 * square(s * fq); |
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70 | } |
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71 | |
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