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 sld, double solvent_sld); |
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4 | double Iqxy(double qx, double qy, double length, double kuhn_length, |
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5 | double radius, double sld, double solvent_sld); |
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6 | double flexible_cylinder_kernel(double q, double length, double kuhn_length, |
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7 | double radius, double sld, double solvent_sld); |
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8 | |
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9 | |
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10 | double form_volume(double length, double kuhn_length, double radius) |
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11 | { |
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12 | |
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13 | return 0.0; |
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14 | } |
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15 | |
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16 | double flexible_cylinder_kernel(double q, |
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17 | double length, |
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18 | double kuhn_length, |
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19 | double radius, |
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20 | double sld, |
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21 | double solvent_sld) |
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22 | { |
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23 | |
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24 | double Pi = 4.0*atan(1.0); |
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25 | |
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26 | double cont = sld-solvent_sld; |
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27 | double qr = q*radius; |
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28 | double flex = Sk_WR(q,length,kuhn_length); |
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29 | double crossSect = (2.0*J1(qr)/qr)*(2.0*J1(qr)/qr); |
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30 | |
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31 | flex *= crossSect; |
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32 | flex *= Pi*radius*radius*length; |
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33 | flex *= cont*cont; |
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34 | flex *= 1.0e-4; |
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35 | |
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36 | return flex; |
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37 | } |
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38 | |
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39 | double Iq(double q, |
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40 | double length, |
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41 | double kuhn_length, |
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42 | double radius, |
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43 | double sld, |
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44 | double solvent_sld) |
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45 | { |
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46 | |
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47 | double result = flexible_cylinder_kernel(q, length, kuhn_length, radius, sld, solvent_sld); |
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48 | |
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49 | return result; |
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50 | } |
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51 | |
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52 | double Iqxy(double qx, double qy, |
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53 | double length, |
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54 | double kuhn_length, |
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55 | double radius, |
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56 | double sld, |
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57 | double solvent_sld) |
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58 | { |
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59 | double q; |
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60 | q = sqrt(qx*qx+qy*qy); |
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61 | double result = flexible_cylinder_kernel(q, length, kuhn_length, radius, sld, solvent_sld); |
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62 | |
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63 | return result; |
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64 | } |
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