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²Ù×÷ϵͳҪÇóÈçÏ£º Version 6 runs on 32 or 64 bit Windows 7, 8 or 10 The 64 bit version utilizes 64 bit addressing allowing all of memory to be utilized
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Ó¢Îļò½é£º Version 6 of TOPAS-Academic is now available to: 1) Degree-granting institutions comprising universities, university run institutes, laboratories and schools.
2) Synchrotron and neutron research centers.
In both cases use is for research purposes and not for commercial clients of the institution.
TOPAS-Academic comprises all the functionality of BRUKER-AXS TOPAS operating in Launch mode including all graphics and OpenGL structure editor and viewer. Launch mode is where the full functionality of TOPAS is realized.
What is TOPAS-Academic?
TOPAS-Academic is a Windows based general non-linear least squares system driven by a scripting language. Its main focus is in crystallography, solid state chemistry and optimization. At the core of TA is its superb minimization routines wrapped by a computer algebra system; it is this foundation that makes subject dependent modules such as Rietveld refinement shine. The main features include: Computer algebra system for function minimization and for the application of linear/non-linear constraints. A fully functional Rietveld program for laboratory x-ray diffraction, synchrotron, single crystal and neutron fixed wavelength and TOF data. A simulated annealing algorithm for all systems including structure solution in real space from powder, neutron, neutron TOF and single crystal data. An indexing algorithm. A command line program called TC.EXE which comprises the Kernel of TA; used for batch processing. Tutorials describing the functionality of TOPAS-Academic, courtesy of John Evans, can be found here.
Who is it for?
TOPAS-Academic is for scientists and PhD students working in the fields of crystallography, solid state chemistry, optimization and function minimization in general. Requests for TA without crystallographic modules or as a teaching aid should be made to the author. Input to TOPAS-Academic - Writing INP scripts
TOPAS-Academic/TOPAS comparison? There is no difference between the kernel of TA and Bruker-AXS TOPAS for the same version number. TA will always comprise the latest kernel. There are no differences in regards to single crystal refinement, structure solution, neutron TOF and non-standard Rietveld refinement. There are some differences in how data input is handled for peak fitting as seen in the tutorials . For standard Rietveld refinement then TOPAS offers the use of Windows dialogs. Indexing is different but on the whole similar - again see the tutorials. |
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