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Flender/Flender Gear Units/Helical speed reducers H4

ill be more difcult unless provi-sions for positioning sampling tubes within the pile are made. Measurements and analysiscan be simplied by sampling during the periods between ventilation cycles. In such situation, the analysis of Table 1 could be adjusted to accommodate negligible dilution with lower quantity of volatiles present. For example, if one assumes that the room hasbeen completely replenished with fresh air at the end of cycle, 4 hours later, the quantityof volatiles present is 1/6 of the quantity in the table. However, since air changes due toleakage during the 4- period should amount to only fraction of complete air change,the dilution factor should be small enough to cancel out the effect of having lower quantity of volatiles produced in the shorter period. Thus, it seems likely that specic volatile or volatiles should still be fairly easily detected with network of sampling tubeswithin the pile. These rather straightforward analyses nevertheless provide good indication as to the viability of the volatile monitoring technique for detecting disease in storage. ACKNOWLEDGMENTS The authors wish to acknowledge the editorial suggestions of one of the pioneers in volatile monitoring for detection of disease in storage, Dr. . . Pritchard of the University of Manitoba. The authors also gratefully acknowledge nancial support from the Natural Sciences and Engineering Research Council (NSERC) and the Conseil des recherches enpeche et en agroalimentaire du Que bec (CORPAQ) for past and ongoing research con- ducted at Macdonald Campus of McGill University. Finally, the efforts of the many re-searchers who have contributed directly and indirectly to this area of research over thecentury are sincerely acknowledged. Volatile Monitoring in Storage 6 REFERENCES 1. Ouellette, ., Raghavan, . . ., Reeleder, . . Volatile proles for disease detection in stored carrots. Can. Agric. Eng . 1, 3, 2. 2. Waterer, . ., Pritchard, . . Monitoring of volatiles: technique for