From Northwestern University Center for Atom-Probe Tomography
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/Archive 1


If you have any changes to make to the Nomenclature page, feel free to make them directly. If you think a point is contentious, you might highlight the cell in gray in the article page & put a footnote that directs people to a topic on this talk page. Topics that have been resolved are archived at the above link. If you want to reopen any of them, please start a new section on THIS page (rather than editing the archive).

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Mean Planar Radius

Excerpt from conversation with CKS:

The precipitation strengthening community (including both Ardell and Nembach) generally use



 $\langle r \rangle$

DNS converted us to:

 $\langle R \rangle$

and, after MUCH debate, the Al people settled on


If you want to change it, you may have a fight with Keith! That might be one of the things that really sparked creation of that wiki page two years ago & was one of his first rants about notation.

While I use Keith's notation, I personally think \bar{R} and R_{PS} are both ugly as sin. I plan to use KEK's notation until we find a mutual compromise or until DNS asks me to change. Since we might be able to change this quantity, perhaps R^{2D} or R_A (the former being similar to the interppt paper's notation & the latter being similar to notation used by stereology (A is area)?

Do they use subscript PS for any other quantity? Is there a way that they differentiate between something that is directly measured from cross sections vs. that which is converted from the 3D <R>?

Because of the LEAP (and, for some of us, because of the ppts are small w.r.t a TEM foil), we often measure <R> directly and must convert to a planar radius to calculate interactions in a glide plane, etc. This differs from SEM work, of course. --Rick 14:19, 15 June 2007 (CDT)

To discuss. --Chris Booth 11:58, 19 June 2007 (CDT)

Confidence threshold

What to use for confidence threshold. RPK uses the verbose <math>c^{threshold}</math>. --Chris Booth 11:46, 19 June 2007 (CDT)

Deprecated? --Rick 18:06, 28 June 2007 (CDT)