[RASMB] SEDANAL question

[John Sumida]

Hi Walter, 

 

Just want to thank you for your comments and advice.  

 

Using the correct units, Liters/gram, for ks, made all the difference in
fitting our data.

 

Thank you,

John Sumida

University of Washington

 

From: Walter Stafford [mailto:wstafford3 at walterstafford.com] 
Sent: Wednesday, March 20, 2019 7:16 PM
To: John Sumida <jpsumida at uw.edu>
Cc: RASMB <rasmb at list.rasmb.org>
Subject: Re: [RASMB] SEDANAL question

 

Question: which "scaling parameters" are you referring to? and which
parameter is entered as 9 mls/gram. NOTE: The mass concentration units used
by SEDANAL are  L/g, not mL/g.

 

So if you entered "9", you should try 0.009 (units are L/g)


Walter Stafford

wstafford3 at walterstafford.com <mailto:wstafford3 at walterstafford.com> 

 

"The things you do for yourself are gone when you are gone, but things you
do for others remain as your legacy." --Kalu Ndukwe Kalu





On Mar 20, 2019, at 19:55, John Sumida <jpsumida at uw.edu
<mailto:jpsumida at uw.edu> > wrote:

 

Dear RASMB,

 

In performing a multicomponent non-ideal fit using SEDANAL (ver. 693, and
705), the fitted scaling parameters consistently drift to their maximum
upper limit value when N, the number points between meniscus and base, was
increased from 500 to 1000 and above.  This also was true if the initial
guesses varied significantly from a value of 9mls/gram.

 

What are some possible reasons that a fit would perform in this manner?

 

Thanks to all in advance for considering my question.

 

John Sumida

University of Washington

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