Changeset b9958b3 in sasview for sansmodels/src/sans


Ignore:
Timestamp:
Sep 16, 2011 5:03:42 PM (13 years ago)
Author:
Jae Cho <jhjcho@…>
Branches:
master, ESS_GUI, ESS_GUI_Docs, ESS_GUI_batch_fitting, ESS_GUI_bumps_abstraction, ESS_GUI_iss1116, ESS_GUI_iss879, ESS_GUI_iss959, ESS_GUI_opencl, ESS_GUI_ordering, ESS_GUI_sync_sascalc, costrafo411, magnetic_scatt, release-4.1.1, release-4.1.2, release-4.2.2, release_4.0.1, ticket-1009, ticket-1094-headless, ticket-1242-2d-resolution, ticket-1243, ticket-1249, ticket885, unittest-saveload
Children:
ad019b83
Parents:
a5e14410
Message:

additional doc for shulz

File:
1 edited

Legend:

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  • sansmodels/src/sans/models/media/pd_help.html

    r76b5220 rb9958b3  
    5858the average particle volume such that P(q) = scale*&lt;F*F&gt;/Vol + bkg, where 
    5959F is the scattering amplitude and the &lt; &gt; denote an average over the size 
    60 distribution.  Users should use PD for a size distribution and Sigma for an 
    61 angular distribution.</span></p> 
     60distribution.  Users should use PD (polydispersity: this definition is different from the typical definition in polymer science)  
     61for a size distribution and Sigma for an 
     62angular distribution (see below).</span></p> 
    6263<p> Note that this computation is very time intensive thus applying polydispersion/angular distrubtion for  
    63 more than one paramters or increasing Npts values might need extensive patience to complete the computation.</p> 
     64more than one paramters or increasing Npts values might need extensive patience to complete the computation. Also 
     65note that even though it is time consuming, it is safer to have larger values of Npts and Nsigmas.</p> 
    6466 
    6567<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt'><span 
     
    333335width=80 height=24 src="pd_image012.png"></span><span 
    334336style='font-family:"Times New Roman","serif"'>.</span></p> 
    335  
     337<p/> 
     338<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt'><span 
     339style='font-family:"Times New Roman","serif"'>Note that the higher PD (polydispersity) 
     340 might need higher values of Npts and Nsigmas. For example, at PD = 0.7 and  radisus = 60 A,  
     341 Npts >= 160, and Nsigmas >= 15 at least.</span></p> 
     342 <p/> 
    336343<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt'><span 
    337344style='font-family:"Times New Roman","serif"'><img width=438 height=232 
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