1 | // NOTE that "length" here is the full height of the core! |
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2 | static double |
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3 | form_volume(double r_minor, |
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4 | double x_core, |
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5 | double thick_rim, |
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6 | double thick_face, |
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7 | double length) |
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8 | { |
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9 | return M_PI*( (r_minor + thick_rim)*(r_minor*x_core + thick_rim)* length + |
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10 | square(r_minor)*x_core*2.0*thick_face ); |
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11 | } |
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12 | |
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13 | static double |
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14 | Iq(double q, |
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15 | double r_minor, |
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16 | double x_core, |
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17 | double thick_rim, |
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18 | double thick_face, |
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19 | double length, |
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20 | double rhoc, |
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21 | double rhoh, |
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22 | double rhor, |
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23 | double rhosolv, |
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24 | double sigma) |
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25 | { |
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26 | double si1,si2,be1,be2; |
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27 | // core_shell_bicelle_elliptical_belt, RKH 5th Oct 2017, core_shell_bicelle_elliptical |
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28 | // tested briefly against limiting cases of cylinder, hollow cylinder & elliptical cylinder models |
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29 | // const double uplim = M_PI_4; |
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30 | const double halfheight = 0.5*length; |
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31 | //const double va = 0.0; |
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32 | //const double vb = 1.0; |
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33 | // inner integral limits |
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34 | //const double vaj=0.0; |
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35 | //const double vbj=M_PI; |
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36 | |
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37 | const double r_major = r_minor * x_core; |
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38 | const double r2A = 0.5*(square(r_major) + square(r_minor)); |
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39 | const double r2B = 0.5*(square(r_major) - square(r_minor)); |
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40 | // dr1,2,3 are now for Vcore, Vcore+rim, Vcore+face, |
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41 | const double dr1 = (-rhor - rhoh + rhoc + rhosolv) *M_PI*r_minor*r_major* |
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42 | 2.0*halfheight; |
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43 | const double dr2 = (rhor-rhosolv) *M_PI*(r_minor+thick_rim)*( |
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44 | r_major+thick_rim)* 2.0*halfheight; |
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45 | const double dr3 = (rhoh-rhosolv) *M_PI*r_minor*r_major* |
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46 | 2.0*(halfheight+thick_face); |
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47 | //initialize integral |
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48 | double outer_sum = 0.0; |
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49 | for(int i=0;i<GAUSS_N;i++) { |
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50 | //setup inner integral over the ellipsoidal cross-section |
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51 | // since we generate these lots of times, why not store them somewhere? |
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52 | //const double cos_alpha = ( GAUSS_Z[i]*(vb-va) + va + vb )/2.0; |
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53 | const double cos_alpha = ( GAUSS_Z[i] + 1.0 )/2.0; |
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54 | const double sin_alpha = sqrt(1.0 - cos_alpha*cos_alpha); |
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55 | double inner_sum=0; |
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56 | double sinarg1 = q*halfheight*cos_alpha; |
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57 | double sinarg2 = q*(halfheight+thick_face)*cos_alpha; |
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58 | si1 = sas_sinx_x(sinarg1); |
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59 | si2 = sas_sinx_x(sinarg2); |
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60 | for(int j=0;j<GAUSS_N;j++) { |
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61 | //76 gauss points for the inner integral (WAS 20 points,so this may make unecessarily slow, but playing safe) |
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62 | //const double beta = ( GAUSS_Z[j]*(vbj-vaj) + vaj + vbj )/2.0; |
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63 | const double beta = ( GAUSS_Z[j] +1.0)*M_PI_2; |
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64 | const double rr = sqrt(r2A - r2B*cos(beta)); |
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65 | double besarg1 = q*rr*sin_alpha; |
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66 | double besarg2 = q*(rr+thick_rim)*sin_alpha; |
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67 | be1 = sas_2J1x_x(besarg1); |
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68 | be2 = sas_2J1x_x(besarg2); |
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69 | inner_sum += GAUSS_W[j] *square(dr1*si1*be1 + |
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70 | dr2*si1*be2 + |
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71 | dr3*si2*be1); |
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72 | } |
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73 | //now calculate outer integral |
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74 | outer_sum += GAUSS_W[i] * inner_sum; |
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75 | } |
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76 | |
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77 | return outer_sum*2.5e-05*exp(-0.5*square(q*sigma)); |
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78 | } |
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79 | |
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80 | static double |
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81 | Iqabc(double qa, double qb, double qc, |
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82 | double r_minor, |
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83 | double x_core, |
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84 | double thick_rim, |
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85 | double thick_face, |
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86 | double length, |
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87 | double rhoc, |
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88 | double rhoh, |
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89 | double rhor, |
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90 | double rhosolv, |
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91 | double sigma) |
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92 | { |
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93 | // integrated 2d seems to match 1d reasonably well, except perhaps at very high Q |
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94 | // Vol1,2,3 and dr1,2,3 are now for Vcore, Vcore+rim, Vcore+face, |
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95 | const double dr1 = -rhor - rhoh + rhoc + rhosolv; |
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96 | const double dr2 = rhor-rhosolv; |
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97 | const double dr3 = rhoh-rhosolv; |
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98 | const double r_major = r_minor*x_core; |
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99 | const double halfheight = 0.5*length; |
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100 | const double vol1 = M_PI*r_minor*r_major*length; |
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101 | const double vol2 = M_PI*(r_minor+thick_rim)*(r_major+thick_rim)*2.0*halfheight; |
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102 | const double vol3 = M_PI*r_minor*r_major*2.0*(halfheight+thick_face); |
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103 | |
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104 | // Compute effective radius in rotated coordinates |
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105 | const double qr_hat = sqrt(square(r_major*qb) + square(r_minor*qa)); |
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106 | // does this need to be changed for the "missing corners" where there there is no "belt" ? |
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107 | const double qrshell_hat = sqrt(square((r_major+thick_rim)*qb) |
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108 | + square((r_minor+thick_rim)*qa)); |
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109 | const double be1 = sas_2J1x_x( qr_hat ); |
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110 | const double be2 = sas_2J1x_x( qrshell_hat ); |
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111 | const double si1 = sas_sinx_x( halfheight*qc ); |
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112 | const double si2 = sas_sinx_x( (halfheight + thick_face)*qc ); |
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113 | const double Aq = square( vol1*dr1*si1*be1 + vol2*dr2*si1*be2 + vol3*dr3*si2*be1); |
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114 | return 1.0e-4 * Aq*exp(-0.5*(square(qa) + square(qb) + square(qc) )*square(sigma)); |
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115 | } |
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