2nd Collaborative Study of the CORESTA on the Comparability of Three Selected Methods Measuring the Pressure Drop of Filter Rods/Auswertung der 2. CORESTA-Ringuntersuchung über die Vergleichbarkeit von drei ausgewählten Messmethoden für den Zugwiderstand von Filterstäben

Q3 Agricultural and Biological Sciences
M. Bethmann, H. Böttcher
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引用次数: 1

Abstract

Abstract Nineteen companies and institutes participated in the second collaborative study, using the measuring methods VA, PA and C in 3 series of filter-rods of 50 pieces each; 4 participants received 3 series and 3 CFO respectively. The differences of the mean values were much smaller than in the first collaborative study and did not exceed 28 mm water. Also the standard deviation of the single values and the standard deviation of reproducibility have decreased to less than half in comparison to the first collaborative study. There was no difference in the method-mean value over all participants and series. Significant differences arose however between the participant-mean values and the mean values as well of the standard deviations of the participants as also of their standard deviations of reproducibility. A regression between the standard deviation of the single values and the standard deviations of reproducibility could however not be shown. Comparing the values of the standard deviation between the samples of the same participants to the values of the residual variance of the single analysis of variance of the series over all participants, it shows that the latter is mostly based on the systematic participant influence. Also a regression between the standard deviation of the single values and the mean values of the pressure drop could not be noticed. An influence of temperature, relative humidity and atmospheric pressure on the value of the pressure drop could only be stated in series III of measuring method C corr. But it was so small that it could practically be neglected. By means of a rank correlation a connection between the mean values of the first and the second collaborative study could be shown for different parameters with most participants. This fact is another proof that the stated differences in pressure drop are mostly based on factors being characteristic for the individual participants. It is to be aimed at the fact that all these factors are checked more thoroughly in order to improve the agreement of the mean values of the pressure drop between the participants
2.为解决这些问题而产生的补救措施3种选择的滤毒方法在滤毒棒排气管的可比
19家公司和研究所参与了第二次合作研究,采用了3个系列50支过滤棒的VA、PA和C测量方法;4名参与者分别接受3个系列和3个CFO。平均值的差异比第一次合作研究要小得多,并且不超过28毫米水。与第一次合作研究相比,单值的标准偏差和可重复性的标准偏差也下降到不到一半。在所有参与者和系列中,方法平均值没有差异。然而,在参与者的平均值和平均值之间,以及参与者的标准偏差之间,以及他们的可重复性标准偏差之间,出现了显著差异。然而,单值的标准偏差和重复性的标准偏差之间的回归不能显示。将相同参与者样本间的标准差值与所有参与者的序列单方差分析的残差值进行比较,可以看出后者主要基于系统参与者的影响。单值的标准差与压降的平均值之间也不存在回归。温度、相对湿度和大气压力对压降值的影响只能在测量方法C的系列III中说明,但其影响非常小,几乎可以忽略不计。通过秩相关的方法,第一次和第二次合作研究的平均值在大多数参与者的不同参数下可以显示出联系。这一事实再次证明,所述的压降差异主要是基于个体参与者的特征因素。它的目的是为了更彻底地检查所有这些因素,以提高参与者之间压力降平均值的一致性
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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Beitrage zur Tabakforschung International/ Contributions to Tobacco Research
Beitrage zur Tabakforschung International/ Contributions to Tobacco Research Agricultural and Biological Sciences-Agronomy and Crop Science
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