[504abee] | 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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[92ce163] | 17 | double sum=0.0; |
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[504abee] | 18 | |
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[74768cb] | 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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[e7678b2] | 21 | double sn, cn; |
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| 22 | SINCOS(zi, sn, cn); |
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[92ce163] | 23 | const double arg = q*sqrt(a*a*sn*sn + b*b*cn*cn); |
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[592343f] | 24 | const double yyy = sas_2J1x_x(arg); |
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[74768cb] | 25 | sum += GAUSS_W[i] * yyy * yyy; |
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[504abee] | 26 | } |
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[92ce163] | 27 | sum *= 0.5; |
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| 28 | return(sum); |
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[504abee] | 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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[e7678b2] | 41 | double flex,crossSect, cont; |
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[504abee] | 42 | |
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[e7678b2] | 43 | cont = sld - solvent_sld; |
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| 44 | crossSect = elliptical_crosssection(q,radius,(radius*axis_ratio)); |
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[504abee] | 45 | |
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[e7678b2] | 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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[504abee] | 51 | |
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[e7678b2] | 52 | return flex; |
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[504abee] | 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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[e7678b2] | 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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[504abee] | 71 | |
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[e7678b2] | 72 | return result; |
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[504abee] | 73 | } |
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| 74 | |
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