Changeset 490f790 in sasview


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Timestamp:
Sep 28, 2018 7:20:48 AM (3 weeks ago)
Author:
smk78
Branches:
master, gpu-options-handling, py37-all, py37-sascalc, py37-sasgui, pytest, simplify-c-build, ticket-1094-headless, ticket-1111
Children:
2ae8579
Parents:
acdf0d1
Message:

Tweaks to corfunc_help.rst

File:
1 edited

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  • src/sas/sasgui/perspectives/corfunc/media/corfunc_help.rst

    r501712f r490f790  
    3333Both analyses are performed in 3 stages: 
    3434 
    35 *  Extrapolation of the scattering curve to :math:`Q = 0` and toward  
    36    :math:`Q = \infty` 
     35*  Extrapolation of the scattering curve to :math:`q = 0` and toward  
     36   :math:`q = \infty` 
    3737*  Smoothed merging of the two extrapolations into the original data 
    3838*  Fourier / Hilbert Transform of the smoothed data to give the correlation 
     
    4747------------- 
    4848 
    49 To :math:`Q = 0` 
     49To :math:`q = 0` 
    5050................ 
    5151 
     
    6767the impact on any extrapolated parameters will be least significant. 
    6868 
    69 To :math:`Q = \infty` 
     69To :math:`q = \infty` 
    7070..................... 
    7171 
     
    145145        - do they smoothly curve onto the ordinate at x = 0? (if not check the value  
    146146          of :math:`\sigma` is sensible) 
    147         - are there ripples at x values corresponding to (2 :math:`pi` over) the two  
     147        - are there ripples at x values corresponding to (2 :math:`\pi` over) the two  
    148148          q values at which the extrapolated and experimental data are merged? 
    149         - are there any artefacts at x values corresponding to 2 :math:`pi` / q\ :sub:`max` in  
     149        - are there any artefacts at x values corresponding to 2 :math:`\pi` / q\ :sub:`max` in  
    150150          the experimental data?  
    151151        - and lastly, do the significant features/peaks in the correlation functions  
     
    158158    -q^{4} I(q) 
    159159 
    160 The IDF is proportional to the second derivative of Γ\ :sub:`1`\ (x). 
     160The IDF is proportional to the second derivative of Γ\ :sub:`1`\ (x) and represents a  
     161superposition of thickness distributions from all the contributing lamellae.  
    161162 
    162163Hilbert 
     
    192193*   Local Crystallinity :math:`= L_c/L_p` 
    193194 
     195.. warning:: If the sample does not possess lamellar morphology then "Compute  
     196    Parameters" will return garbage! 
     197         
     198 
    194199Volume Fraction Profile 
    195200....................... 
     
    213218 
    214219The reader is directed to the references for information on these parameters. 
     220 
    215221 
    216222References 
     
    263269Once the Q ranges have been set, click the "Calculate Bg" button to determine the  
    264270background level. Alternatively, enter your own value into the box. If the box turns  
    265 yellow this indicates that background subtraction has created some negative intensities. 
     271yellow this indicates that background subtraction has created some negative intensities.  
     272This may still be fine provided the peak intensity is very much greater than the  
     273background level. The important point is that the extrapolated dataset must approach  
     274zero at high-q. 
    266275 
    267276Now click the "Extrapolate" button to extrapolate the data. The graph window will update  
     
    296305 
    297306.. note:: 
    298     This help document was last changed by Steve King, 26Sep2017 
     307    This help document was last changed by Steve King, 28Sep2017 
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