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GrainGenes Reference Report: CCM-72-368

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Reference	CCM-72-368
Title	Sample frequency effects on mixograms
Journal	Cereal Chemistry
Year	1995
Volume	72
Pages	368-370
Author	Hazelton J Walker C
Abstract	Since the development of the mixograph, researchers have tried to measure and predict the physical properties of dough by recording the bowl movements with a mechanical pen device (Swanson and Working 1933) Today, with advances in computerization and electronics, scientists are able to collect and save data in ways that were not possible in the 1930s Some researchers (Navickis et al 1990, Stearns and Barta 1990) have stressed the necessity of sampling at high frequencies (at least 50 Hz), whereas others (Voisey et al 1966) found that a moderate frequency of 4 Hz was satisfactory However, very low sampling frequencies (1-2 Hz) caused problems during data collection and analysis (Rubenthaler and King 1986) A useful technique for studying the relative merits of sampling at different frequencies is to initially collect data at a high frequency and then systematically 'strip', or remove part of the data (Walker and Walker 1992). By controlling the stripping pattern, the effects of sampling frequency can be shown in a manner that is exactly the same as originally collecting data at different frequencies, but without the small random error and variability that occur between two replicate samples. The objective of this study was to examine the effects of sampling frequency on mixogram data. This was accomplished by collecting data from both moving and fixed bowl mixographs at a high frequency and then electronically stripping the data to generate mixograms at lower frequencies.
Keyword	[ Hide all but 1 of 6 ] data-collection experimental-design instrumentation mixing sampling wheat flour

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