core_shell_microgelsmagnetic_modelticket-1257-vesicle-productticket_1156ticket_1265_superballticket_822_more_unit_tests
Last change
on this file since 2773c66 was
2586093f,
checked in by Paul Kienzle <pkienzle@…>, 7 years ago
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use standard kernel name
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Property mode set to
100644
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File size:
537 bytes
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1 | double form_volume(void); |
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2 | |
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3 | double Iq(double q, double radius2, double arms); |
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4 | |
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5 | static double star_polymer_kernel(double q, double radius2, double arms) |
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6 | { |
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7 | |
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8 | double u_2 = radius2 * q * q; |
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9 | double v = u_2 * arms / (3.0 * arms - 2.0); |
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10 | |
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11 | double term1 = v + expm1(-v); |
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12 | double term2 = ((arms - 1.0)/2.0) * square(expm1(-v)); |
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13 | |
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14 | return (2.0 * (term1 + term2)) / (arms * v * v); |
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15 | |
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16 | } |
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17 | |
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18 | double form_volume(void) |
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19 | { |
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20 | return 1.0; |
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21 | } |
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22 | |
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23 | double Iq(double q, double radius2, double arms) |
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24 | { |
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25 | return star_polymer_kernel(q, radius2, arms); |
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26 | } |
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