Preservatives performance criteria

The principle uses of the zinc borate Zn[B304(0H)3] are as a polymer additive and preservative for wood composites, such as oriented strand board (OSB). As a polymer additive it functions as a fire retardant synergist and modifier of electrical and optical properties. Its function as a fire retardant additive is discussed further below. A substantial amount of Zn[B304(0H)3] is used to improve the tracking index, which is an important performance criterion for polymers, such as polyamides (nylon) and polybutyl teraphtha-lates (PBT), used in electrical applications. 

Both individual and societal risks may be presented on an absolute basis compared to a specific risk target or criterion. Or, they may be presented on a relative basis to avoid arguments regarding the adequacy of the absolute numbers while preserving the salient differences between alternatives. The end results of the risk presentation may be a single number (or a range of numbers if an uncertainty analysis was performed) or one or more graphs. 

In the discussed approach to data set compression there is a need to predefine percentage of variance to be preserved by the retained coefficients (or alternatively the average RMS of data reconstruction). We performed all calculations for 99% of variance. The best-basis was calculated for all studied filters using entropy as basis selection criterion. As expected, the number N of retained wavelet coefficients, depends on the applied filter. The number of the retained coefficients varies from 139 to 177. The worst compression is with filter No. 2, and the best with filter No. 15 (see Fig. 10). Final results for the optimal filter (No. 15) are presented in Table 2. 

The separation impedance is a measure of column performance and allows one to compare, for example, capillary columns to packed beds. The performance index is a measure of the quality of the separation and contains a strong dependence on analysis time. 1 would prefer a criterion that preserves the... 

A constraint is a chemical or mathematical property that the profiles should fulfil [10]. For this criterion, the chemical structure of the data is taken into consideration in the selection of the proper constraints. The most common constraints are non-negativity and tmimodality. Non-negativity forces the profiles to only contain non-zero values. This is especially useful for spectral and chromatographic profiles. Unimodality constraints can help to preserve the presence of only one peak in each profile extracted. Nevertheless, there are a number of constraints that can be used, mainly to improve the performance... 

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