The 4th Annual Meeting of ORSO




The fourth annual meeting of the Open Reflectometry Standards Organisation.

The purpose of the meeting is to discuss topics of interest to the ORSO community. The full program will consist of scientific anf technical talks together with discussion forums for each of the working groups

Please note that the timetable is using the time zone: Europe (Stokholm)


    • Plenary Session: Introduction & AGM
      • 1
        General Introduction
      • 2
        Introduction to the DAPHNE project
        Speaker: Wiebke Lohstroh:
      • 3
        Presentation of Orsopy
        Speaker: Jochen Stahn (Paul Scherrer Institut)
      • 11:15 AM
      • 4
    • Education & Outreach Working Group: Collection of Teaching Materials
    • Education & Outreach Working Group: Webpage Hackathon
    • Priors and posteriors paper: Reproducibility Working Group

      More and more Bayesian analysis is being used to interpret reflectometry data.
      However, how this information is reported is inconsistent potentially limiting the replicability and reproduciblity of the results.
      To improve this, within the Reproduciblity Working Group, we have started to develop a short publication defining some best practice for reporting results and inputs to Bayesian analysis.

      In this session, we seek feedback on the current draft of the paper and will aim to improve the work based on this feedback.
      Note the expectation for attending this session is that you have read the draft and are able to offer feedback, it is not expected that you are an expert user of Bayesian analysis (as you might be the exact audience that we are targeting in that case).
      Attendence of this session will lead to inclusion as a co-author of the paper (if desired).

      • 5
        Presentation of paper

        Draft of a paper that aims to advise on how to report prior and posterior probabilities distributions when you do Bayesian analysis in reflectometry.

      • 6
        Discussion & contributions

        Atendees will be expected to prepare and contribute

    • Plenary Session
      • 7
        Ellipsometry data analysis in Python
        Speaker: Hayden Robertson
      • 8
        mlreflect – a Python-based pipeline for neutron and X-ray reflectivity data analysis using neural networks
        Speaker: Alessandro Greco
    • Data Analysis Working Group: A Simple model language
    • Education & Outreach Working Group: SLD Database
    • Plenary Session
      • 9
        Autonomous neutron reflectometry (real-time entropy hacking using machine learning)
        Speaker: David Hoogerheide
      • 10
        Advantages of 1D detectors for the recording of (x-ray) reflectivity curves on laboratory instruments.
        Speaker: Dieter Lott
    • Data Analysis Working Group: Validation Datasets
    • Data Formats Working Group: CANSAS general description for resolution functions

      The numerical convolutions of the appropriate functions for fixed wavelength SANS gives improved Q resolution functions that are slightly flatter in the peak and broader in the tails than the classic Mildner & Carpenter approach. However, in time-of-flight SANS the resolution curves from all the wavelengths contributing to a particular Q value are averaged together, weighted by the number of neutrons detected at each wavelength. Since the resolution width is inversely proportional to wavelength this often gives a curve that is noticeably sharper in the peak and broader in the tails than a simple Gaussian.
      In either type of SANS measurement a more detailed description of Q resolution smearing within fitting programs such as SasView will need generic resolution functions of arbitrary shape.
      The generic resolution function was subject of discussion at CanSAS workshop in March 2021 and efforts have been for devising data format and using arbitrary function in SasView. The summary of these activities will be provided in the presentation

    • Plenary Session: Closing Session
      • 11
        Summary of sessions
      • 12
        AGM vote results
      • 13
        Developing advanced models of biological membranes to investigate protein-lipid interactions
        Speaker: Alessandra Luchini (European Spallation Source ERIC)