Browsing by Author "Cox, GW"
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- ItemAn archival and automatic retrieval system for IBM360 disk data sets(Australian Atomic Energy Commission, 1978-10) Cox, GW; Richardson, DJA system is described which allows infrequently used disk data sets to be archived on magnetic tape and restored to disk automatically when required. The system currently operates on an IBM360 computer under Release 21.7 of operating system MVT.
- ItemA modified version of the Busing-Martin-Levy least squares program for the direct fitting of structures to powder diffraction patterns by the method of profile analysis(Australian Atomic Energy Commission, 1973-03) Taylor, JC; Cox, GWThe Busing-Martin-Levy (BML) crystallographic least squares program has been modified to handle the case of the overlapping diffraction data encountered in powder patterns. Each count along the scan is treated as a single observation and the pattern is considered to be the superposition of the (h,k,l) Gaussian peaks, as in the method of Rietveld (Acta Cryst., 22, 151 (1967)). In this way the structure is fitted directly to the diffraction pattern, while details of the profiles are not lost. For this reason, together with the fact that a larger number of observations are used, the method is superior to conventional refinements with integrated intensities (which can also be done with the present program).
- ItemPDP11ASM and PDP11SIM : a PDP11 assembler and a PDP11 simulator to run on an IBM360 computer(Australian Atomic Energy Commission, 1972-11) Cox, GWVariations in entrained air in mineral slurries cause errors in on-stream X-ray analysis for element concentration in the slurry solids. Complete elimination of entrained air may not always be practicable, particularly for radioisotope X-ray techniques where probes are immersed directly into existing plant slurry vessels through which the whole process stream flows. Calculations of the effect of entrained air on precision of analysis show that X-ray preferential absorption techniques are usually much more affected than X-ray fluorescence techniques. Calculations agree reasonably well with results of plant trials of on-stream analysis. Errors in analysis using radioisotope immersion probes should in most cases be within limits acceptable for plant control.
- ItemPrograms for the management and processing of neutron diffraction data(Australian Atomic Energy Commission, 1971-02) Elcombe, MM; Cox, GW; Pryor, AW; Moore, FHThis report describes the programs developed over about five years at Lucas Heights for the processing of crystallographic data from manual and computer-controlled diffractometers. The description, theory, and input and output formats are given, but not the program listings. Sections 2 and 3 describe the programs for handling, editing and reducing the 5-hole tape produced by manually-operated machines. Section 4 describes the revised versions of the programs associated with the computer-controlled diffractometers. It replaces the previous report AAEC-E-191 as an operating manual for these instruments. Section 5 describes the programs for sorting, absorption-correcting and evaluating standard deviations. Section 6 describes the Job-Control procedures.