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北京石油化工学院2026年研究生招生接收调剂公告
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marise

木虫 (小有名气)

[交流] alert c求助

PLAT731_ALERT_1_C Bond    Calc     0.82(5), Rep     0.82(2) ......       2.50 su-Ra
              O5   -H5W     1.555   1.555                                      
PLAT731_ALERT_1_C Bond    Calc     0.82(5), Rep     0.82(2) ......       2.50 su-Ra
              O5   -H6W     1.555   1.555  


PLAT731

--------------------------------------------------------------------------------
PLAT731 Type_1 Test for consistency of Bond su's and Coordinate su's in CIF
--------------------------------------------------------------------------------

A large ratio of the reported and calculated bond s.u.'s is found.
The use of a DFIX instruction might cause such a warning since
calculated s.u.'s are based on reported variances only.
Note_1: su's on the unitcell dimensions are taken into account in the
calculation of expected su's. This may result in large differences
between expected and reported su's when this contribution is not included
in the reported su's, in particular for inaccurate unitcells.
Note_2: Another source for the discrepancy between calculated and
reported su's can be that the validation software has access only to
the variances of the refined parameters as opposed to the full co-variance
matrix used by e.g. SHELXL for the calculation of derived parameters
with associated su's. Constrained/restrained refinement may cause largei
co-variances.  

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zhaoyangqufu

至尊木虫 (知名作家)


waiy2001(金币+1,VIP+0):谢谢参与 9-19 22:42
是不是使用dfix命令了?
可以用afix取代这个限制命令。
2楼2009-09-19 21:42:16
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