Recent Development of Bulk Sampling Theory
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Reviews on bulk sampling theory are given from the following three points of view.<BR>Sample division-experimental results of sample division on samples for size deter-mination and samples for chemical analysis of iron ores show that division errors express-ed in variance are inverse proportional to masses of sample retained.<BR>Systematic sampling-the precision of systematic sampling depends on the nature of variation of the population, i. e., random, periodic, trended, or correlated. It is proved by W. G. Cochran that stratified random sampling is more efficient than systematic sampling for the trended population. Trends are observed in all of size, moisture and total iron con-tent in an iron ore during the discharging of the whole vessel. Optimal sampling methods are discussed in these cases.<BR>Variogram-variograms of moisture content in a lumpy iron ore, gold content in a gold bearing ore, one hundred successive masses of molten iron tapped from a blast fur-nace and sulfur content in these tappes of molten iron, together with correlograms of the gold content and the masses of molten iron, are presented and discussed.
- 一般社団法人 日本エネルギー学会の論文
一般社団法人 日本エネルギー学会 | 論文
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