scholarly journals Calibration of an X-Ray Diffraction Method to Determine Relative Mineral Abundances in Bulk Powders Using Matrix Singular Value Decomposition: A Test from the Barbados Accretionary Complex

Author(s):  
A.T. Fisher ◽  
M.B. Underwood
2014 ◽  
Vol 369 (1647) ◽  
pp. 20130336 ◽  
Author(s):  
Kristoffer Haldrup

The development of new X-ray light sources, XFELs, with unprecedented time and brilliance characteristics has led to the availability of very large datasets with high time resolution and superior signal strength. The chaotic nature of the emission processes in such sources as well as entirely novel detector demands has also led to significant challenges in terms of data analysis. This paper describes a heuristic approach to datasets where spurious background contributions of a magnitude similar to (or larger) than the signal of interest prevents conventional analysis approaches. The method relies on singular-value decomposition of no-signal subsets of acquired datasets in combination with model inputs and appears generally applicable to time-resolved X-ray diffuse scattering experiments.


2003 ◽  
Vol 84 (3) ◽  
pp. 2112-2129 ◽  
Author(s):  
Marius Schmidt ◽  
Sudarshan Rajagopal ◽  
Zhong Ren ◽  
Keith Moffat

2003 ◽  
Vol 36 (4) ◽  
pp. 982-985 ◽  
Author(s):  
Shigeru Okamoto ◽  
Shinichi Sakurai

Time-resolved small-angle X-ray scattering (TR-SAXS) studies of the structural changes in a block copolymer after a temperature jump are reported. The sample used was a polystyrene-block-poly(ethylene-alt-butylene)-block-polystyrene (SEBS) triblock copolymer, which has a number-average molecular weight of 54000 g mol−1and a volume fraction of polystyrene of 0.227. The film specimen was prepared by the solution-cast method using a selective solvent. The as-cast specimen with lamellar microdomains underwent the temperature jump from 363 to 403 K and the morphological transition from lamellae to cylinders was observed as a function of time by the TR-SAXS technique. The singular value decomposition (SVD) analysis was performed on the scattering profiles. This analysis strongly suggested the existence of a third basis component of the X-ray scattering profiles, thus supporting that there is an intermediate state during the transition from lamellae to cylinders.


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