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1999 Annual Report of the IUCr Commission on Small-Angle Scattering
- Subject: 1999 Annual Report of the IUCr Commission on Small-Angle Scattering
- From: "John D. Barnes" <john.barnes@nist.gov>
- Date: Sat, 5 Jun 1999 05:28:12 -0400
1999 Annual Report of the IUCr Commission on Small-Angle Scattering During the past year the IUCr Commission on Small-Angle Scattering has continued in its tutorial and community building efforts with three workshops. An interlaboratory test program to evaluate small-angle scattering test methods is currently in its initial design stages. The Commission is providing considerable assistance to the SAS 99, the XI Triennial World SAS Congress, taking place in Brookhaven National Lab, USA, on 16-20 May 19999. The first workshop, on "Data Handling for Small-Angle Scattering," was held in conjunction with the 1998 American Crystallographic Assn Annual Meeting in Arlington, VA. Commission members John Barnes and Dmitri Svergun were aided by Malcolm Capel and Jan Skov Pedersen as they explored issues ranging from proposed standard data formats to visualization tools for user facilities. Another edition of this workshop will be conducted on 16 May 1999 in conjunction with SAS 99. The workshop title is canSAS II in recognition of the close relationship between the Commission and the canSAS (Collective Aid to Nomadic Small-Angle Scatterers) project (see http://www.ill.fr/lss/canSAS/welcome.html). A second workshop, conducted as a tutorial for end users of SAS techniques in the polymer field, was held under the joint sponsorship of the Commission and the American Chemical Society Polymeric Materials Science and Engineering Division. The workshop was part of the ACS's August 1998 National meeting in Boston, MA. The workshop title was "SAS in the Industrial Plastics Laboratory." Commission chair Dr. John Barnes was the instructor. Technical activity in the standardization area is slowly ramping up. Dr. Dmitri Svergun and Marc Malfois of EMBL have circulated drafts of a sasCIF format and have worked with Drs. Brown and Toby of COMCIFS to bring sasCIF into conformance with the applicable standards. This work will be carried forward at canSAS II and it is expected that the sasCIF format will be used in the upcoming interlaboratory test programs. At the time of this writing a variety of compression-molded samples of various polyethylene resins are being evaluated as candidate samples for an interlaboratory test program. The next stage of the project involves distributing these samples to a limited number of trusted laboratories. These labs will be asked to evaluate the samples using their standard procedures with the goal of providing the best possible description of the SAS properties of the samples. They will be asked to report the results using the sasCIF standard. A task group will review the results from this preliminary study and then design a suitable protocol for a larger study involving any labs in the SAS community who want to participate. Those members of the community who are aware of the project have been quite supportive. The intent and the approach are somewhat different from that of the 1978[1] effort, but we hope that it will prove to be equally useful. [1] Hendricks, R. W. et al, J. Appl Cryst, 1978, vol 11, pp 196-205. Respectfully submitted Dr. John D. Barnes email: john.barnes@nist.gov Natl Inst of Stds and Tech Voice: 301-975-6786 100 Bureau Drive, Stop 8544 FAX: 301-975-4977 Gaithersburg, MD 20899 URL: http://www.nist.gov/sas or http://polymers.msel.nist.gov/staff/detail.cfm?SID=110
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