Changeset 68f45cb in sasmodels


Ignore:
Timestamp:
Mar 7, 2017 4:03:07 PM (3 years ago)
Author:
Paul Kienzle <pkienzle@…>
Branches:
master, core_shell_microgels, costrafo411, magnetic_model, ticket-1257-vesicle-product, ticket_1156, ticket_1265_superball, ticket_822_more_unit_tests
Children:
9c44b7b
Parents:
7e4a633
Message:

multilayer vesicle: add doc on how to use array distribution

File:
1 edited

Legend:

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  • sasmodels/models/multilayer_vesicle.py

    r7e4a633 r68f45cb  
    55This model is a trivial extension of the core_shell_sphere function to include 
    66*N* shells where the core is filled with solvent and the shells are interleaved 
    7 with layers of solvent. For *N = 1*, this returns the same as the vesicle model, 
     7with layers of solvent. For $N = 1$, this returns the same as the vesicle model, 
    88except for the normalisation, which here is to outermost volume. 
    99The shell thicknessess and SLD are constant for all shells as expected for 
     
    4545for $P(Q)$ when $P(Q) * S(Q)$ is applied. 
    4646 
     47For mixed systems in which some vesicles have 1 shell, some have 2, 
     48etc., use polydispersity on $N$ to model the data.  For example, 
     49create a file such as *shell_dist.txt* containing the relative portion 
     50of each vesicle size:: 
     51 
     52    1 20 
     53    2  4 
     54    3  1 
     55 
     56Turn on polydispersity and select an array distribution for the *n_shells* 
     57parameter.  Choose the above *shell_dist.txt* file, and the model will be 
     58computed with 80% 1-shell vesicles, 16% 2-shell vesicles and 4% 
     593-shell vesicles. 
    4760 
    4861The 2D scattering intensity is the same as 1D, regardless of the orientation 
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