Changeset cb0dc22 in sasmodels


Ignore:
Timestamp:
Mar 24, 2017 12:20:51 AM (3 years ago)
Author:
butler
Branches:
master, core_shell_microgels, costrafo411, magnetic_model, ticket-1257-vesicle-product, ticket_1156, ticket_1265_superball, ticket_822_more_unit_tests
Children:
9f91afe, 3a45c2c, d810d96, 6cff473
Parents:
1aa7990
Message:

document known issue in cs parallelepiped and the fact that it is not
completely understood and under review. ticken #786 can now be moved to
release 4.2

File:
1 edited

Legend:

Unmodified
Added
Removed
  • sasmodels/models/core_shell_parallelepiped.py

    r797a8e3 rcb0dc22  
    44 
    55Calculates the form factor for a rectangular solid with a core-shell structure. 
    6 **The thickness and the scattering length density of the shell or "rim" 
    7 can be different on all three (pairs) of faces.** 
     6The thickness and the scattering length density of the shell or  
     7"rim" can be different on each (pair) of faces. However at this time 
     8the model does **NOT** actually calculate a c face rim despite the presence of 
     9the parameter. 
     10 
     11.. note:: 
     12   This model was originally ported from NIST IGOR macros. However,t is not 
     13   yet fully understood by the SasView developers and is currently review. 
    814 
    915The form factor is normalized by the particle volume $V$ such that 
     
    3541    V = ABC + 2t_ABC + 2t_BAC + 2t_CAB 
    3642 
    37 **meaning that there are "gaps" at the corners of the solid.** 
     43**meaning that there are "gaps" at the corners of the solid.**  Again note that 
     44$t_C = 0$ currently.  
    3845 
    3946The intensity calculated follows the :ref:`parallelepiped` model, with the 
     
    4148amplitudes of the core and shell, in the same manner as a core-shell model. 
    4249 
    43 .. math:: 
    44  
    45     F_{a}(Q,\alpha,\beta)= 
    46     \Bigg(\frac{sin(Q(L_A+2t_A)/2sin\alpha sin\beta)}{Q(L_A+2t_A)/2sin\alpha 
    47     sin\beta)} 
    48     - \frac{sin(QL_A/2sin\alpha sin\beta)}{QL_A/2sin\alpha sin\beta)} \Bigg) 
    49     + \frac{sin(QL_B/2sin\alpha sin\beta)}{QL_B/2sin\alpha sin\beta)} 
    50     + \frac{sin(QL_C/2sin\alpha sin\beta)}{QL_C/2sin\alpha sin\beta)} 
    5150 
    5251.. note:: 
     
    9392    detector plane. 
    9493 
    95 Validation 
    96 ---------- 
    97  
    98 The model uses the form factor calculations implemented in a c-library provided 
    99 by the NIST Center for Neutron Research (Kline, 2006). 
    100  
    10194References 
    10295---------- 
     
    113106 
    114107* **Author:** NIST IGOR/DANSE **Date:** pre 2010 
    115 * **Last Modified by:** Paul Butler **Date:** September 30, 2016 
    116 * **Last Reviewed by:** Miguel Gonzales **Date:** March 21, 2016 
     108* **Converted to sasmodels by:** Miguel Gonzales **Date:** February 26, 2016 
     109* **Last Modified by:** Wojciech Potrzebowski **Date:** January 11, 2017 
     110* **Currently Under review by:** Paul Butler 
    117111""" 
    118112 
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