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Volume 23 (1992 - 199･･･
- Issue 3 Pages 111-
- Issue 2 Pages 55-
- Issue 1 Pages 1-
Volume 23, Issue 2
Displaying 1-6 of 6 articles from this issue
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Kazunori HIRONAKA, Kenji SAWAEDA, Ken-ichi ISHIBASHI1992 Volume 23 Issue 2 Pages 55-60
Published: November 30, 1992
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThe change in the viscoelasticity of the Chinese yam during growth was investigated from mid- August to late November, 1988 in the Tokachi district of Japan. The Chinese yam had peak viscoelasticity around October 24. Its viscosity was correlated with the insoluble solid content, whereas its rigidity was associated with the mucilage content. Viscosity and rigidity values of Chinese yam during maturation reached maximum when the soil temperature at 40cm decreased to around 11°C.View full abstractDownload PDF (599K) -
Kazutaka UMETSU, Hidehiko TAKAHATA, Tsunemi KAWAMOTO1992 Volume 23 Issue 2 Pages 61-66
Published: November 30, 1992
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSA conventional system and a two-phase mesophilic anaerobic digestion system was studied at a digester temperature of 35°C using completely-mixed digesters. There were no significant differences between the two methods in the amount of biogas produced but a significant difference was recognized in the methane content (p<0.01). In the two-phase system, the methane content of the biogas produced remained high and constant. In the conventional system, material temperature had direct effects upon biogas production (p<0.05), but there was no significant difference between the two temperatures (5 and 35°C) in the methane content. The two-phase digestion system maintains its reduction of volatile solids, while a conventional system falls drastically when the loading rate (g of Volatile solids/liter per day) is larger than 10.View full abstractDownload PDF (576K) -
The Air Permeability of Insect Screen Used in Ventilation Opening of GreenhouseYu-I HUANG, Yoshiyasu AIHARA, Tomoyuki SENO, Makoto NARA1992 Volume 23 Issue 2 Pages 67-71
Published: November 30, 1992
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSVentilation opening covered with screen are being utilized for eliminating insect infestationsin the greenhouses in Taiwan. In this study, airpermeability of seven types of insect screens wasinvestigated. The result showed that air exchangeindex (n) was in the region of 1.70-1.88, and theair exchange rate (a. m3/(m2·min·Pa1/n)) increased with larger porosities of screen by a function of a=1.36×102.35μ. When Reynolds number were about 400, pressure loss coefficient (ζ) obtained for each screen became constant, and the relation between ζ and μ was deduced to ζ=0.95(1-μ)/μ2.View full abstractDownload PDF (515K) -
The net body surface area concerned in mass transferHirofumi KAWANISHI, Morimasa NAGASHIMA, Denzou SAHARA, Yoshiyasu AIHAR ...1992 Volume 23 Issue 2 Pages 73-80
Published: November 30, 1992
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSIn order to determine net body surface area concerned in mass transfer, we observed behavior and posture of cows and swines.
The results obtained are summarized as follows;
1) The lying times of cows were about 500min/day and four patterns of lying posture were observed in cows in the stall.
2) The ratio of bovine net body surface area concerned in mass transfer to the whole body surface area were almost consistent regardless of pattern of lying posture, and were around 67%.
3) The ratios of bovine net body surface area concerned in mass transfer to the whole body surface area, when determined as a 24 hour-round, were between 84% and 93%. The relation between the 24 hour-ratio and bovine live weight is described by the following formula;
Rc=100W/(0.892W+148)
Rc: The 24 hour-ratio of bovine net body surface area concerned in mass transfer to the whole body surface area (%)
Wc: live weight of cow (kg)
4) Swines seemed to be in lying postures over 90% of nighttime and 82% of a day, irrespective of body weight.
5) Swines showed six patterns of lying posture when they were lying separately from each other, while five patterns when they were lying in a huddle. The ratios of swine net body surface area concerned in mass transfer to the whole body surface area were around 75% in the former case. In the latter case, the ratios were between 46% and 64% for swines in the middle of the huddle while about 80% for ones on its outskirts.
6) When Boon's Huddling Index is used, the 24 hour-ratio of swine net body surface area concerned in mass transfer to the whole body surface area can be calculated from the following formula;
Rs=(62.8×HI+(1-HI)×77.5)×0.82+100×0.18
Rs: The 24 hour-ratio of swine net body surface area concerned in mass transfer to the whole body surface area (%)
HI: Huddling Index of Boon (1982)View full abstractDownload PDF (829K) -
(Part I) Color Grading of Apple by Neural Network SystemsKazuhiro NAKANO, Kazuhiko KURATA, Masahiko KANEKO, Yuichi KAZAMA, Ken- ...1992 Volume 23 Issue 2 Pages 81-86
Published: November 30, 1992
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSUniform color grading of apple is still a serious problem because of judgment errors caused by the seasonal fluctuation in grading criterion, the difference of criterion in producing area and the fatigue of grading workers.
In this study, a method for color grading of apple is examined by neural network systems used image processing instead of human eyes. As the results, the grade judgment ratio is more than 90% at the last recognition error e=0.01 with the neural network systems used in this study. It was proved that the neural network systems has the reappearance of color grading of apple.View full abstractDownload PDF (1758K) -
Limi OKUSHIMA, Makoto NARA1992 Volume 23 Issue 2 Pages 87-93
Published: November 30, 1992
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSDownload PDF (4060K)
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