Changeset 490f790 in sasview
 Timestamp:
 Sep 28, 2018 7:20:48 AM (3 weeks ago)
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 master, gpuoptionshandling, py37all, py37sascalc, py37sasgui, pytest, simplifycbuild, ticket1094headless, ticket1111
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 2ae8579
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 acdf0d1
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src/sas/sasgui/perspectives/corfunc/media/corfunc_help.rst
r501712f r490f790 33 33 Both analyses are performed in 3 stages: 34 34 35 * Extrapolation of the scattering curve to :math:` Q= 0` and toward36 :math:` Q= \infty`35 * Extrapolation of the scattering curve to :math:`q = 0` and toward 36 :math:`q = \infty` 37 37 * Smoothed merging of the two extrapolations into the original data 38 38 * Fourier / Hilbert Transform of the smoothed data to give the correlation … … 47 47  48 48 49 To :math:` Q= 0`49 To :math:`q = 0` 50 50 ................ 51 51 … … 67 67 the impact on any extrapolated parameters will be least significant. 68 68 69 To :math:` Q= \infty`69 To :math:`q = \infty` 70 70 ..................... 71 71 … … 145 145  do they smoothly curve onto the ordinate at x = 0? (if not check the value 146 146 of :math:`\sigma` is sensible) 147  are there ripples at x values corresponding to (2 :math:` pi` over) the two147  are there ripples at x values corresponding to (2 :math:`\pi` over) the two 148 148 q values at which the extrapolated and experimental data are merged? 149  are there any artefacts at x values corresponding to 2 :math:` pi` / q\ :sub:`max` in149  are there any artefacts at x values corresponding to 2 :math:`\pi` / q\ :sub:`max` in 150 150 the experimental data? 151 151  and lastly, do the significant features/peaks in the correlation functions … … 158 158 q^{4} I(q) 159 159 160 The IDF is proportional to the second derivative of Î\ :sub:`1`\ (x). 160 The IDF is proportional to the second derivative of Î\ :sub:`1`\ (x) and represents a 161 superposition of thickness distributions from all the contributing lamellae. 161 162 162 163 Hilbert … … 192 193 * Local Crystallinity :math:`= L_c/L_p` 193 194 195 .. warning:: If the sample does not possess lamellar morphology then "Compute 196 Parameters" will return garbage! 197 198 194 199 Volume Fraction Profile 195 200 ....................... … … 213 218 214 219 The reader is directed to the references for information on these parameters. 220 215 221 216 222 References … … 263 269 Once the Q ranges have been set, click the "Calculate Bg" button to determine the 264 270 background level. Alternatively, enter your own value into the box. If the box turns 265 yellow this indicates that background subtraction has created some negative intensities. 271 yellow this indicates that background subtraction has created some negative intensities. 272 This may still be fine provided the peak intensity is very much greater than the 273 background level. The important point is that the extrapolated dataset must approach 274 zero at highq. 266 275 267 276 Now click the "Extrapolate" button to extrapolate the data. The graph window will update … … 296 305 297 306 .. note:: 298 This help document was last changed by Steve King, 2 6Sep2017307 This help document was last changed by Steve King, 28Sep2017
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