Numerical instabilities in Teubner Strey model (Trac #530)

[sasview-bot]

We encountered this problem with the downloaded version of the executable SasView.
When we try to calculate the intensities using for the parameters:
background =0
scale = 0.1
c2 = 4.9020e+04
c1 = -3.4265e+02
We obtain nonphysical sharp features.
We got at these values by taking the values for $d$ and $\xi$ we have obtained from SESANS measurements on oil water emulsions.
I could help to work with more the more physical parameters $d$ and $\xi$, as is done in http://dx.doi.org/10.1063/1.1377881

Migrated from http://trac.sasview.org/ticket/530

{
    "status": "closed",
    "changetime": "2016-10-01T15:20:07",
    "_ts": "2016-10-01 15:20:07.535192+00:00",
    "description": "We encountered this problem with the downloaded version of the executable SasView.\nWhen we try to calculate the intensities using for the parameters:\nbackground =0\nscale = 0.1\nc2 = 4.9020e+04\nc1 = -3.4265e+02\nWe obtain nonphysical sharp features.\nWe got at these values by taking the values for $d$ and $\\xi$ we have obtained from SESANS measurements on oil water emulsions.\nI could help to work with more the more physical parameters $d$ and $\\xi$, as is done in http://dx.doi.org/10.1063/1.1377881",
    "reporter": "wimbouwman",
    "cc": "",
    "resolution": "fixed",
    "workpackage": "SasModels Redesign",
    "time": "2016-03-17T16:49:47",
    "component": "SasView",
    "summary": "Numerical instabilities in Teubner Strey model",
    "priority": "critical",
    "keywords": "",
    "milestone": "SasView 4.0.0",
    "owner": "ajj",
    "type": "enhancement"
}

[sasview-bot]

Trac update at 2016/03/17 17:27:26:

• wimbouwman changed attachment from "" to "endo2001.pdf"
• wimbouwman commented:

Article with physical parameters Teubner Strey model in Eq(32)

[butlerpd]

Trac update at 2016/06/20 00:14:09: butler commented:

This is the same as #606 I believe. Since there is an attachement will leave here. But when fixed should close both tickets.

[butlerpd]

Trac update at 2016/08/16 16:57:19:

• butler commented:

with the 4.0 release being way late, we clearly don't have the bandwidth to deal with such a change now. Moving to +1

• butler changed milestone from "SasView 4.0.0" to "SasView Next Release +1"
• butler changed type from "defect" to "enhancement"
• butler changed workpackage from "SasView Bug Fixing" to "SasModels Redesign"

[butlerpd]

Trac update at 2016/09/05 02:27:47:

• butler commented:

Moving back to 4.0 as part of ticket #775 admonition to finalize parameter and model names so as to remain compatible in the future

• butler changed milestone from "SasView Next Release +1" to "SasView 4.0.0"
• butler changed priority from "major" to "critical"

[butlerpd]

Trac update at 2016/09/05 14:47:38:

• butler commented:

since this is essentially the same as ticket #606 owned by Andrew am assigning this one as well. If reassigned they should be reassigned together.

• butler changed owner from "" to "ajj"
• butler changed status from "new" to "assigned"

[ajj]

Trac update at 2016/10/01 15:20:07:

• ajj commented:

In changeset caddb14:

#!CommitTicketReference repository="sasmodels" revision="caddb142198aa5e7856a0850214d72611c3b6ba8"
Updated and re-parameterised Teubner-Strey model.

Closes #606
Closes #663

• ajj changed resolution from "" to "fixed"
• ajj changed status from "assigned" to "closed"