Effects of normalization on feature selection in pyrolysis gas chromatography of coal tar pitches

摘要: Computerized calculation of variance weights sometimes detected important features that were not obvious from visual inspections chromatograms for any two three classes coal tar pitches. In addition, normalizations by one or more peak areas heights, procedures often resorted to as a means minimizing the effect differences in size sample heterogeneity, generally resulted decreasing all features. Finally, successful was devised correcting obtained using column had gradually degraded during long series runs.