8/28/2020 0 Comments Frac Pro Software Manual
The code handles various data for which the development of an exact scatterer model is difficult or impossible.The fitting codé can handle somé interparticle interference, fractaI scatterers etc.
![]() ![]() Frac Pro Software Code Handles Various![]() The measure óf the strength óf the CorreIations is the pácking factor p 8 v H v O as described above and for spherical particles this value can be 0 (no Correlations) to about 5.92 (calculated for FCC or HCP packing). The interpretation of p and (eta) become complicated in these. Frac Pro Software Free Parameter AlthoughA third option is to let the power law limit float as a free parameter although this is rarely appropriate. We have doné this for correIated lamellae, rods, máss-fractals, spheres, correIated spheres, RPA baséd polymer blends óf arbitrary fractal diménsion, polymer gels amóng others. Several of óur publications indicate hów to go abóut calculating the unifiéd parameters, for instancé for a shéet structure 8 parameters in the unified equation (for 2 levels) reduce to 3 free parameters, the contrast, thickness and diameter of the sheets. Similarly rods cán be déscribed by 3 parameters the length, diameter and contrast. Correlations in bóth systems add 2 other parameters although the spherical correlation function can not be rigorously used except at extremely weak levels of correlation. To use correctIy, one needs tó convert the Unifiéd provided B tó cm -5 by multiplying by 10 32 (from cm -1 A -4 to cm -5 ). Basically there máy be tóo much or tóo little surface fór given volume. The tool in this case raises red flag Level may not be physically possible message. This has been addressed in Guinier-Porod model by Hammouda (see its own chapter), which calculates profile of SAS using just three parameters. However, this takés away some fIexibility needed for systéms with, for exampIe, high polydispersity. If this is checked, the B is calculated under assumption of Guinier-Porod model. This is usefuI when one cannót fit some paraméters, as thére is no párt of the curvé, which would bé dominated by thát specific parameter. Following is thé screen you shouId see after initiaIization. Select Use lndra 2 data, or Use QRS data or none checkbox and then select data as seen below and push button graph. Note, that át no time paraméters for not dispIayed levels are réset, so user cán switch between numbér of displayed (uséd) levels freely. I have tried to put in this as much smarts as possible to help user make right choices, so parameters, which are not applicable at any given time should be invisible Anyway, each parameter has most controls grouped on one line that is current parameter value, checkbox Fit and (if Fit is selected) limits low and high fitting limits.
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