1 | double form_volume(double radius, double thick_rim, double thick_face, double length); |
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2 | double Iq(double q, |
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3 | double radius, |
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4 | double thick_rim, |
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5 | double thick_face, |
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6 | double length, |
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7 | double core_sld, |
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8 | double face_sld, |
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9 | double rim_sld, |
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10 | double solvent_sld); |
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11 | |
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12 | |
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13 | double Iqxy(double qx, double qy, |
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14 | double radius, |
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15 | double thick_rim, |
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16 | double thick_face, |
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17 | double length, |
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18 | double core_sld, |
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19 | double face_sld, |
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20 | double rim_sld, |
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21 | double solvent_sld, |
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22 | double theta, |
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23 | double phi); |
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24 | |
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25 | |
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26 | double form_volume(double radius, double thick_rim, double thick_face, double length) |
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27 | { |
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28 | return M_PI*(radius+thick_rim)*(radius+thick_rim)*(length+2.0*thick_face); |
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29 | } |
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30 | |
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31 | static double |
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32 | bicelle_kernel(double qq, |
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33 | double rad, |
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34 | double radthick, |
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35 | double facthick, |
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36 | double length, |
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37 | double rhoc, |
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38 | double rhoh, |
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39 | double rhor, |
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40 | double rhosolv, |
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41 | double sin_alpha, |
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42 | double cos_alpha) |
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43 | { |
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44 | double si1,si2,be1,be2; |
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45 | |
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46 | const double dr1 = rhoc-rhoh; |
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47 | const double dr2 = rhor-rhosolv; |
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48 | const double dr3 = rhoh-rhor; |
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49 | const double vol1 = M_PI*rad*rad*(2.0*length); |
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50 | const double vol2 = M_PI*(rad+radthick)*(rad+radthick)*2.0*(length+facthick); |
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51 | const double vol3 = M_PI*rad*rad*2.0*(length+facthick); |
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52 | double besarg1 = qq*rad*sin_alpha; |
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53 | double besarg2 = qq*(rad+radthick)*sin_alpha; |
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54 | double sinarg1 = qq*length*cos_alpha; |
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55 | double sinarg2 = qq*(length+facthick)*cos_alpha; |
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56 | |
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57 | be1 = sas_2J1x_x(besarg1); |
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58 | be2 = sas_2J1x_x(besarg2); |
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59 | si1 = sas_sinx_x(sinarg1); |
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60 | si2 = sas_sinx_x(sinarg2); |
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61 | |
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62 | const double t = vol1*dr1*si1*be1 + |
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63 | vol2*dr2*si2*be2 + |
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64 | vol3*dr3*si2*be1; |
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65 | |
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66 | const double retval = t*t*sin_alpha; |
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67 | |
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68 | return retval; |
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69 | |
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70 | } |
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71 | |
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72 | static double |
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73 | bicelle_integration(double qq, |
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74 | double rad, |
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75 | double radthick, |
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76 | double facthick, |
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77 | double length, |
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78 | double rhoc, |
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79 | double rhoh, |
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80 | double rhor, |
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81 | double rhosolv) |
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82 | { |
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83 | // set up the integration end points |
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84 | const double uplim = M_PI_4; |
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85 | const double halfheight = 0.5*length; |
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86 | |
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87 | double summ = 0.0; |
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88 | for(int i=0;i<N_POINTS_76;i++) { |
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89 | double alpha = (Gauss76Z[i] + 1.0)*uplim; |
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90 | double sin_alpha, cos_alpha; // slots to hold sincos function output |
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91 | SINCOS(alpha, sin_alpha, cos_alpha); |
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92 | double yyy = Gauss76Wt[i] * bicelle_kernel(qq, rad, radthick, facthick, |
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93 | halfheight, rhoc, rhoh, rhor, rhosolv, |
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94 | sin_alpha, cos_alpha); |
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95 | summ += yyy; |
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96 | } |
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97 | |
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98 | // calculate value of integral to return |
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99 | double answer = uplim*summ; |
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100 | return answer; |
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101 | } |
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102 | |
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103 | static double |
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104 | bicelle_kernel_2d(double qx, double qy, |
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105 | double radius, |
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106 | double thick_rim, |
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107 | double thick_face, |
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108 | double length, |
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109 | double core_sld, |
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110 | double face_sld, |
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111 | double rim_sld, |
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112 | double solvent_sld, |
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113 | double theta, |
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114 | double phi) |
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115 | { |
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116 | double q, sin_alpha, cos_alpha; |
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117 | ORIENT_SYMMETRIC(qx, qy, theta, phi, q, sin_alpha, cos_alpha); |
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118 | |
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119 | double answer = bicelle_kernel(q, radius, thick_rim, thick_face, |
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120 | 0.5*length, core_sld, face_sld, rim_sld, |
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121 | solvent_sld, sin_alpha, cos_alpha) / fabs(sin_alpha); |
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122 | |
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123 | answer *= 1.0e-4; |
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124 | |
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125 | return answer; |
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126 | } |
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127 | |
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128 | double Iq(double q, |
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129 | double radius, |
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130 | double thick_rim, |
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131 | double thick_face, |
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132 | double length, |
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133 | double core_sld, |
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134 | double face_sld, |
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135 | double rim_sld, |
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136 | double solvent_sld) |
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137 | { |
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138 | double intensity = bicelle_integration(q, radius, thick_rim, thick_face, |
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139 | length, core_sld, face_sld, rim_sld, solvent_sld); |
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140 | return intensity*1.0e-4; |
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141 | } |
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142 | |
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143 | |
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144 | double Iqxy(double qx, double qy, |
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145 | double radius, |
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146 | double thick_rim, |
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147 | double thick_face, |
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148 | double length, |
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149 | double core_sld, |
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150 | double face_sld, |
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151 | double rim_sld, |
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152 | double solvent_sld, |
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153 | double theta, |
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154 | double phi) |
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155 | { |
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156 | double intensity = bicelle_kernel_2d(qx, qy, |
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157 | radius, |
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158 | thick_rim, |
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159 | thick_face, |
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160 | length, |
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161 | core_sld, |
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162 | face_sld, |
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163 | rim_sld, |
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164 | solvent_sld, |
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165 | theta, |
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166 | phi); |
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167 | |
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168 | return intensity; |
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169 | } |
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