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1

Effective water diffusion coefficient in faba bean seeds during drying. Part II. Analysis of estimation errors

100%
Myhan R., Bialobrzewski I., Cydzik R.
Electronic Journal of Polish Agricultural Universities. Series Agricultural Engineering
|
2005
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tom 08
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nr 2
The objective of this study was to determine the effects of measuring errors on the accuracy of diffusion coefficient estimation as dependent on the method used. The estimation was based on a numerical solution of the inverse function, and inverse problem solving. The analysis concerned results of convective drying of faba bean seeds. The seeds, with an initial moisture content M0=0.240 kgwater/kgdb were dried at 15, 20, 25, 30 and 35°C. The results obtained in the study show that the method based on inverse problem solving is more effective at extreme moisture levels (Θ ≈ 0 and Θ ≈ Θk). This method, used for simulating successive replications, enables to acquire information not only on estimated values of the diffusion coefficient and measuring errors, but also on their distribution.
2

Uncertainty in estimating mean solar radiation fluxes at the Baltic surface from irregular ship-borne meteorological observations

100%
Rozwadowska A.
Oceanologia
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1999
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tom 41
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nr 1
3

Accuracy of radio-tracking to estimate activity and distances walked by European bison in the Bialowieza Forest, Poland

84%
Rouys S., Theuerkauf J., Krasinska M.
Acta Theriologica
|
2001
|
tom 46
|
nr 3
To determine the accuracy of radio-tracking estimates of activity and distances walked by European bison Bison bonasus (Linnaeus, 1758), we observed bison while simultaneously conducting radio-tracking in the Białowieża Forest (Poland). Single radio-tracking estimates often did not represent the actual activity of the bison, but the mean time spent active calculated from radio-tracking and direct observations did not differ significantly. Radio-tracking provided overestimates of the distances walked by bison when the animals walked between 0 and 25 m and underestimated the distances walked by bison if they walked further than 25 m in a radio-tracking interval. Activity was best estimated when radio-trackers were between 200 and 300 m from the bison. The mean activity calculated with a sampling interval of 15 min needed about 8 days of radio-tracking and the mean of distances walked about 35 tracking days to stabilise. We concluded that collars without activity sensors can measure the mean activity of bison but cannot represent the length of their activity bouts or the type of their activity and that our radio-tracking estimates of distances walked by bison needed to be corrected before further analyses.
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