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Originally posted by xujun16 at 2010-07-12 14:30:04:
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The least squares method used in Rietveld refinements is described in the mathematical section. The user must be aware of the way he(she) can control the refinement procedure: the number of parameters to be refined, fixing parameters, making constraints, etc. The control of the refined parameters is achieved by using codewords. These are the numbers that are entered for each refined parameter. A zero codeword means that the parameter is not being refined. For each refined parameter, the codeword is formed as:    Cx=sign£¨a£©£¨10p+¦òa¦ò£©
where p specifies the ordinal number of the parameter x (i.e. p runs from 1 to ) and a (multiplier) is the factor by which the computed shift (see equation 3.5 in mathematical section) will be multiplied before use.
The calculated shifts are also multiplied by a relaxation factor before being applied to the parameters.

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xujun16

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Originally posted by daxu at 2010-07-18 10:12:48:



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The least squares method used in Rietveld refinements is described in the mathematical section. The user must be aware of ...

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panguohui

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Originally posted by daxu at 2010-07-18 10:12:48:



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The least squares method used in Rietveld refinements is described in the mathematical section. The user must be aware of ...

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[ Last edited by panguohui on 2010-7-19 at 16:55 ]
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