Category Archives: Blog posts

Guest Post by Dr. Grégory Stoclet: Crazy deformation of polymers, studied with in-situ SAXS.

[ED: I've started asking around for guest contributions for the LookingAtNothing site, in order to provide a broader view of the SAS-related activities that I could ever hope to achieve by myself. Our first guest to talk about his work is Dr. Grégory Stoclet of UMET at the Université Lille 1.] PLA is a new […]

Share

LookingAtNothing On Tour!

Through a combination of events (and Twitter), my visit to the Diamond Synchrotron has become the nucleation site for a whole host of talks throughout the UK and France. Here’s the plan: 

Share

12 corrections in a row

Just a couple of housekeeping notes: I’m giving talks in Europe in a month at the following locations: Unité Matériaux et Transformations (UMET), Lille on May 16, hosted by Grégory Stoclet, Birmingham University, Birmingham on the 20th of May, hosted by Zoe Schnepp, Nottingham University, Nottingham, on the 23rd of May, hosted by Philip Moriarty, […]

Share

Introspection

I’ve been working on a lot of things of late, but none are yet in a state to show here yet. However, when talking to a colleague last week, I found it hard to explain why I do what I do: why I am so focused on metrology. But maybe I can explain it a […]

Share

Does it matter part 4.2: The actual flatfield

Last week, I talked about how to determine whether a flatfield correction was necessary. Data from a Bruker Hi-Star detector was shown to have very large local sensitivity deviations in the 2D detector image (of +/- 50%), and would therefore need a flatfield correction. So how to get one?

Share

Does it matter part 4: flatfield correction on a Bruker HiStar wire detector

See the previous posts in this series here: Part 1, Part 2 and Part 3 Very recently, Bruker upgraded their SAXS instrument in our building. This is a typical 3-pinhole 2D SAXS system that was largely designed by J. S. Pedersen in Aarhus a decade or so ago. This particular version was at NIMS in […]

Share

Fancy background subtraction: an initial look

As indicated last week, some spare time has been spent trying to re-derive a correction for separating sample container scattering from the sample itself. Normally, a simple background subtraction suffices, but for those who want to go the extra mile (and in particular for those working with strongly absorbing sample containers and samples), you need […]

Share

Cutting-room clippings

For today’s post, I had a few things planned, but haven’t been able to work anything out yet. So I’ll talk a little about these bits and pieces: Upcoming conferences and meetings, some future instrumentation plans, and a little about the Fancy Background Subtraction

Share

Data correction and reduction code functional

Before I get started, let me just highlight the new small-angle scattering issue of J. Appl. Cryst. which has come out a few days ago. My contribution was unfortunately not accepted (and I haven’t worked much on it since due to rejection depression), but the journal is still very much worth a read! Now for […]

Share

Speaking of errors: estimating uncertainties in integrated data (corrigendum to “Everything SAXS”)

I feel I need to make a public apology: it turns out that I have been inaccurate in some of my recent papers on the explanation of the estimation of the uncertainties on the intensities (the uncertainties themselves, however, are correct, so I calculated it right but described it wrong). Here’s what happened:

Share