Data gathering error structure

The three different data sets produce extreme differences In the temperature factors (Table VIII). This difference Is not characteristic of just the SRRC program, as a similar range for cellulose Is In the literature. The temperature factor (B) Is Important because It Indicates systematic error In the Lp correction or other aspect of data gathering and reduction, for at least two of the data sets. Negative temperature factors, as found In the WS data, typically Indicate either that additional atoms, such as water molecules, are needed In the structure, or, when that Is known to be Incorrect, that there Is a flaw In some overall aspect of Intensity measurement, such as background correction. 

The switching-off method for 7/ -free potential measurement is, according to the data in Fig. 3-5, subject to error with lead-sheathed cables. For a rough survey, measurements of potential can be used to set up and control the cathodic protection. This means that no information can be gathered on the complete corrosion protection, but only on the protection current entry and the elimination of cell activity from contacts with foreign cathodic structures. The reverse switching method in Section 3.3.1 can be used to obtain an accurate potential measurement. Rest and protection potentials for buried cables are listed in Table 13-1 as an appendix to Section 2.4. The protection potential region lies within U[[Pg.326]

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