Changeset 083e993 in sasview for src/sans/models/media


Ignore:
Timestamp:
Jan 6, 2014 8:46:26 AM (11 years ago)
Author:
Peter Parker
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:
76cd1ae
Parents:
3f484b0
Message:

Go back and amend Sphere Model documentation.

Location:
src/sans/models/media
Files:
2 edited

Legend:

Unmodified
Added
Removed

  • src/sans/models/media/model_functions.html

    r1327c9b r083e993  
    3333<p>The 1D scattering intensity is calculated in the following way (Guinier, 1955):</p> 
    3434<p style="text-align: center;" align="center"><span style="position: relative; top: 16pt;"><img src="img/image004.PNG" alt="" /></span></p> 
    35 <p>where r is the radius of the sphere, bkg is the background level and sldXXX is the scattering length density (SLD) of the scatterer or the solvent.<\p> 
    36 <p>Note that if your data is on an absolute scale, the 'scale' should represent the volume fraction (unitless) * volume of a scatterer, V.</p> 
     35<p>where scale is a volume fraction, V is the volume of the scatterer, r is the radius of the sphere, bkg is the background level and sldXXX is the scattering length density (SLD) of the scatterer or the solvent.<\p> 
     36<p>Note that if your data is in absolute scale, the 'scale' should represent the volume fraction (unitless) if you have a good fit.  If not, it should represent the volume fraction * a factor (by which your data might need to be rescaled).</p> 
    3737<p>The 2D scattering intensity is the same as above, regardless of the orientation of the q vector.</p> 
    3838<p>The returned value is scaled to units of [cm-1] and the parameters of the sphere model are the following:</p> 
    … …  
    115115<p style="text-align: center; page-break-after: avoid;" align="center">&nbsp;</p> 
    116116<p>Figure 1: Comparison of the DANSE scattering intensity for a sphere with the output of the NIST SANS analysis software. The parameters were set to: Scale=1.0, Radius=60 &Aring;, Contrast=1e-6 &Aring; -2, and Background=0.01 cm -1.</p> 
    117 <p style="margin-left: 0.25in;"><i>2013/09/09 - Description reviewed by King, S. and Parker, P.</i></p> 
     117<p style="margin-left: 0.25in;"><i>2013/09/09 and 2014/01/06 - Description reviewed by King, S. and Parker, P.</i></p> 
    118118<p style="margin-left: 0.55in; text-indent: -0.3in;"><b><span style="font-size: 14pt;">2.2.</span></b><b><span style="font-size: 7pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></b><a name="BinaryHSModel"></a><b><span style="font-size: 14pt;">BinaryHSModel</span></b></p> 
    119119<p>This model (binary hard sphere model) provides the scattering intensity, for binary mixture of spheres including hard sphere interaction between those particles. Using Percus-Yevick closure, the calculation is an exact multi-component solution:</p> 
Note: See TracChangeset for help on using the changeset viewer.