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Volume 14 (1983 - 198･･･
- Issue 3 Pages 2-
- Issue 2 Pages 6-
- Issue 1 Pages 4-
Volume 14, Issue 1
Displaying 1-3 of 3 articles from this issue
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Methane Production from Feces of Dairy CowsKen'ichi ISHIBASHI, Yoshifumi KOHSAKA, Hiroaki KAWANO, Hiroshi KOAZE, ...1983 Volume 14 Issue 1 Pages 4-8
Published: November 25, 1983
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSProduction of methane gas from animal manure has received increasing attention throughout the world as efforts to find alternate energy source intensify. Some of the kinetics of the anaerobic digestion under laboratory condition were investigated using feces of dairy cows.
The results obtained were as follows:
1. When a continuous anaerobic digestion was carried out at loading rate of 3.06kg volatile solid (VS) per day, steady-state periods were shown after about 21 days of operation.
2. In batch-loaded operation, adding rice straw at a concentration of 0-6% to the diluted feces resulted in the same response. However, at more than 10% of rice straw, the amount of gas produced was significantly lower.
3. Diluted sample can be regarded as pseudoplastic fluid when moisture content is less than 2, 400% (d. b.), while diluted one having moisture content more than 3, 000% (d. b.) is Newtonian.
4. When a temperature of the sample solution was lower than 30°C, the viscosity increased with an decrease in the temperature. The solution ranging from 30 to 55°C had the lowest viscosity. As the solution became acid or alkaline, the viscosity went up. However, the solution with a pH of 7-8 had the lowest viscosity.View full abstractDownload PDF (566K) -
A New Method to Measure the Density of Mixed Dust by Particle SizeTomoyuki SENO1983 Volume 14 Issue 1 Pages 9-15
Published: November 25, 1983
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSIt is important factor to prove the physical characteristics of grain dust for the aim to measure the concentration of airborne particles, to design the dust control system, and so on. To measure the density of mixed dust by particle size, a new technique was developed.
By using elutriation method and photometric method (light scanning method), the density of particulate material can be measured with small quantity of sample.
Method of analysis were described in equation (1)-(8), and fig. 6. The parameter e was defined with the parameter f as eq. (10) which was clarified by particle size distribution analysis, experimentally.
Elutriation treatment needs much time comparatively, but if the relation between parameter e and f was proved, and if the computer program was capable, it is easy to analyze and solve, and can be obtained reproducible, agreeable results with little personal measurement error.View full abstractDownload PDF (3686K) -
Yukoh OGURA1983 Volume 14 Issue 1 Pages 16-20
Published: November 25, 1983
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThis report investigates the heat storage characteristics of a well water spraying greenhouse with double internal curtains which allows the subsidiary use of hot water heating device.
1) An excllent overall heat transfer coefficient of 0.96Kcal/m2hr°C is obtained with the greenhouse where well water of about 17°C is sprayed over transparent curtain above a reflective curtain maintaining room temperature of 20°C.
2) Compared with a greenhouse with single intenal curtain and well water spraying but without heater, high soil temperature differences more than 10°C and small, upwards soil heat conduction at 6a.m. are new features of the present system.
3) The soil heat conduction of surface layer turns upwards during the night time from downwards during the day time. But this heat conduction is small and has comparatiwely insignificant effects on the heat storage characeristics.
4) The heat released through well water spraying increases with a decrease in ambient temperature. This satisfies an important requisement for the heat storage characteristics of greenhouse.
5) The heat transfer eoeffieient of the well water spraying over curtain alone is calculated after subtracting the effects of the outermost panel and reflective curtain.View full abstractDownload PDF (551K)
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