Changeset 055ec4f in sasmodels
 Timestamp:
 Mar 27, 2019 6:56:00 AM (6 months ago)
 Branches:
 master, core_shell_microgels, magnetic_model, ticket1257vesicleproduct, ticket_1156, ticket_1265_superball, ticket_822_more_unit_tests
 Children:
 5f3c534
 Parents:
 81d0b9b
 File:

 1 edited
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sasmodels/models/rpa.py
r0507e09 r055ec4f 30 30 These case numbers are different from those in the NIST SANS package! 31 31 32 The models are based on the papers by Akcasu *et al.* and by33 Hammouda assuming the polymer follows Gaussian statistics such32 The models are based on the papers by Akcasu *et al.* [1] and by 33 Hammouda [2] assuming the polymer follows Gaussian statistics such 34 34 that $R_g^2 = n b^2/6$ where $b$ is the statistical segment length and $n$ is 35 35 the number of statistical segment lengths. A nice tutorial on how these are 36 constructed and implemented can be found in chapters 28 and 39 of Boualem37 Hammouda's 'SANS Toolbox'.36 constructed and implemented can be found in chapters 28, 31 and 34, and Part H, 37 of Hammouda's 'SANS Toolbox' [3]. 38 38 39 In brief the macroscopic cross sections are derived from the general forms40 for homopolymer scattering and the multiblock crossterms while the inter 39 In brief, the macroscopic cross sections are derived from the general forms 40 for homopolymer scattering and the multiblock crossterms while the inter, 41 41 polymer cross terms are described in the usual way by the $\chi$ parameter. 42 42 … … 48 48 * **Component D is assumed to be the "background" component (ie, all contrasts 49 49 are calculated with respect to component D).** So the scattering contrast 50 for a C/D blend = [SLD(component C)  SLD(component D)]\ :sup:`2`.50 for a C/D blend $\rho_{C/D} = [\rho_C  \rho_D]$\ :sup:`2`. 51 51 * Depending on which case is being used, the number of fitting parameters can 52 52 vary. … … 80 80 * **Converted to sasmodels by:** Paul Kienzle **Date:** July 18, 2016 81 81 * **Last Modified by:** Paul Butler **Date:** March 12, 2017 82 * **Last Reviewed by:** Paul Butler **Date:** March 12, 201782 * **Last Reviewed by:** Steve King **Date:** March 27, 2019 83 83 * **Source added by :** Steve King **Date:** March 25, 2019 84 84 """
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