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Volume 20 (1989 - 199･･･
- Issue 3 Pages 230-
- Issue 2 Pages 155-
- Issue 1 Pages 105-
Volume 20, Issue 1
Displaying 1-5 of 5 articles from this issue
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Positive Experiment of Moisture Content Distribution and Paddy QualitiesZuan JIN, Kiyokazu GOTO, Ritsuya YAMASHITA, Katsuo YAMASHITA1989 Volume 20 Issue 1 Pages 105-111
Published: July 31, 1989
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThe experiment of temporary storage with mixing method was carried out. Two types of experiments were conducted. In experiment A, the mixed paddy was not aerated, on the other hand, aeration was done in experiment B. In these experiments, the change of moisture content distribution after the mixing of raw paddy and half-dried paddy was determined, and the storage quality of paddy was then examined.
1. Measuring the temperature at various positions and depth, the abnormal value was not detected, the deterioration was not then recognized.
2. In case of non-aeration experiment, though the average moisture content did not change, the standard deviation decreased rapidly. This fact shows that the moisture transfer occured from higher moisture paddy to the lower one.
3. In case of experiment B, the average moisture content decreased, the lower the layer was, the higher the drying rate became. In the upper layer, since the air became wet, the halfdried paddy absorbed the moisture.
4. In both experiments A and B, the drying rate of high moisture paddy was high as the lower moisture paddy played a role of a kind of decicant. In these experiments, the possibility of deterioration of high moisture paddy was then very low.
5. In order to check the quality of mixed paddy, the change of grain fissuring, degree of fatty acid, generation of micro organism and germinability were measured during mixing storage. No change was found in any item.
6. From the above-mentioned results, the safety of the temporary storage with mixing method was confirmed. Therefore, this method should be introduced practically, with application of this method to the drying facility, the cost reduction and the improvement of quality should be achieved in the postharvesting of rice.View full abstractDownload PDF (826K) -
Effects of Structure of Manure Gutter and Cow Body Size on Cleanliness of Stall PlatformsDenzo SAHARA, Yoshiyasu AIHARA, Tadao ICHIKAWA, Hirofumi KAWANISHI, Mo ...1989 Volume 20 Issue 1 Pages 113-120
Published: July 31, 1989
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThree typical types of barn gutter were employed to clarify the effects of gutter structure on the cleanliness of stall platforms. Nine cow of variousbody-size were confined in one of three gutter, one after another, during three days of observation. The three type of gutter were: urine-feces mixed type with no cover (A), urine-feces mixed type with steel slotted cover (B), and urine-feces separated type with wood strip cover (C); these were installed in stanchion stalls successinvely on an experimental basis as mentioned in the previous report.
(1) The position of cow hind hoofs during her elimination, (2) the dropping points of her feces and urine, (3) the area of manure spread after dropping, and (4) accumulated amount of daily manure on the stall platforms were measured. The measurement were intercorrelated and analyzed from work efficiency standpoint. Among the three type, type B seems to be superior in preventing spread of feces and urine, because it showed the smallest area of manure spread.
The dropping point of manure and the position of cow hind hoofs shifted rearward about 1.01-1.23cm every addional 10kg of cow body weight. Thus, the area of manure spread and accumulated amount of manure on the platforms showed decrease with increasing cow body weight. It is concluded that type B was the most reasonable construction of the three types.View full abstractDownload PDF (951K) -
Heating SystemKozi SASAKI1989 Volume 20 Issue 1 Pages 121-127
Published: July 31, 1989
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSExperimients were carried out to analyze the heating efficiency and coefficient of performance (COP) of an air type heat pump with a 7.5kW compressor used in a greenhouse 352m2 in area along with the development of methods for efficient and economic operation of the pump.
The air temperature in the greenhouse was maintained at 15 or 13°C, when the ambient air temperature was not lower than -1--2.5°C. The maximum difference between the temperature inside the greenhouse and the ambient air temperature was 17°C.
When the ambient air temperature decreased markedly, the heat pump was operated frequently to remove the frost covering the outer part of the instrument. When the defrosting operations were carried out too frequently, the air temperature in the greenhouse could not be maintained at 15°C.
When the set point of the night temperature was varied 16→13→10°C the air temperature in the greenhouse could be easily maintained at the set point. Therefore it was considered that the modification of the set point of the night temperature was the most suitable method to control the temperature by the air to air type heat pump.
The values of the COP of the heat pump ranged from 2.4 to 3.2, and there was a high correlation between the values of the ambient air temperature and the COP.
Assuming that the electricity charge is 25 yen per kW and heavy oil charge is 65-85 yen per liter the electricity charge for heat pump is equivalent to the heavy oil charge required for heating the air.View full abstractDownload PDF (828K) -
Takayuki KOJIMA, Susumu FUJITA1989 Volume 20 Issue 1 Pages 128-134
Published: July 31, 1989
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThe temperature distribution and the thermal conductivity of the soil at various depths under a greenhouse with an earth-air heat-exchange system were investigated to clarify the heat conduction characteristics. The thermal conductivities measured of the soil at the depth of 10, 50 and 100cm were 0.25, 0.38 and 0.51kcal/mh°C, respectively.View full abstractDownload PDF (716K) -
Shun'ichiro TANAKA1989 Volume 20 Issue 1 Pages 135-138
Published: July 31, 1989
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSDownload PDF (499K)
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