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Volume 32 (2001 - 200･･･
- Issue 4 Pages 161-
- Issue 3 Pages 129-
- Issue 2 Pages 59-
- Issue 1 Pages 1-
Volume 32, Issue 2
Displaying 1-4 of 4 articles from this issue
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Rokhani HASBULLAH, Seishi KAWASAKI, Takayuki KOJIMA, Takayoshi AKINAGA2001 Volume 32 Issue 2 Pages 59-67
Published: September 25, 2001
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSHot water (HW) and vapor heat (VH) treatments were studied to assess the heat effect on fruit quality and respiratory activity of ‘Irwin’ mango (Mangifera Indica Linn.) during storage. The Okinawan grown ‘Irwin’ mangos (average weight of 412.3 (39.0g) were dipped in water temperature of 47.2°C (HW treatment) for 60, 90 and 120°C or exposed at core temperature of 46.5°C (VH treatment) for 10, 20 and 30min. The fruit temperature of 46.5°C was reached after 90min and 150min for HW- and VH treatments, respectively. The heating rates of the HW treatment were significantly higher than that of the VH treatment. The HW- and VH treatments caused an increase in the respiration rate, however, longer exposure time tended to decrease the respiration rate. The peak of the climacteric respiration occurred after 3 and 4 days of storage for VH- and HW treated mango, respectively. The respiratory quotient (RQ) values of the mangos during 14-days storage, ranged between 0.92 and 1.05, were not affected by the heat treatments. The ‘Irwin’ mangos tolerated up to 90min during HW treatment or until the core temperature reached 46.5°C, while with VH treatment the mangos tolerated up to 30min at core temperature of 46.5°C without any visible signs of heat injury and without adversely affecting the market quality of the fruit. The treatment is a need for quarantine requirement for export to certain destination in Japan, US and other countries.View full abstractDownload PDF (1083K) -
Toshimichi KOBAYASHI, Takahiro CHIBA, Tsukasa TOMABECHI, Shinji HOSHIB ...2001 Volume 32 Issue 2 Pages 69-77
Published: September 25, 2001
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSIn this study, we aimed to evaluate the snow load in order to make the construction cost of animal facilities lower in snow zones.
According to the investigation, we concluded as follows;
1) Snow sliding is more influenced by the contact angle than surface coarseness. Snow sliding easily takes place on roofs with high water shedding.
2) when animal facilities are designed, the roof slope should be more than 3/10 if corrugated painted steel sheet or fiber reinforced plastic are used. In the case of using fluorine films or C seed membrane, the slope more than 2/10 is enough.
3) The design snow load should be evaluated not only by water shedding characteristics of roofs but also by livestock housing systems such as stocking rates which may affect the roof surface temperature.View full abstractDownload PDF (2569K) -
Jiaoyan LIU, Munehiro TANAKA, Shigeki INABA, Takayuki KOJIMA2001 Volume 32 Issue 2 Pages 79-84
Published: September 25, 2001
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThe experiment of simulation transport for the strawberry was carried out in the laboratory. Thirteen corrugated fiberboard boxes were filled with strawberries, and arranged in 13 layers. A random vertical vibration was applied on them through a vibration controller. The frequency and acceleration of random vibration were arranged from 5 to 100Hz, and 0 to 4.9m/s2, respectively.
The analysis results were presented in time and power spectra. The time spectra show that the acceleration of strawberries in the bottom layer (1st layer) was greater than that of the top layers; the range is about ±5m/s2. The power spectra show that the vibrations which occurred on the bottom layer have high peaks at the frequency 31 to 43Hz, while almost no peaks appear on the middle and top layers at this frequency.
The results indicate that the vibration transfer characteristics of strawberries decrease at the high frequency and increase at the low frequency as load height increases.View full abstractDownload PDF (2415K) -
Wei Zhong JIANG, Yutaka KITAMURA, Noriaki ISHIZUKA, Tung LIANG2001 Volume 32 Issue 2 Pages 85-92
Published: September 25, 2001
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSIn this study, a Rotational Drum Fermentation System (RDFS) was constructed to develop a dry methane fermentation system for non- or low water-dilution organic waste. Characteristics of the RDFS for solid organic waste were determined. Slightly diluted dairy manure was used as a substrate of the RDFS. RDFS improved the mixing of the reactor content. The volatile acid and methane productivity showed the system feasibility for dry methane fermentation. Process parameters such as pH, VA and methane content were evaluated. The effects of operational conditions such as sludge-manure ratios (1:1, 1:2, 1:3, 1:5) and rotation time (30, 60, 120, 240 minutes/day) of the RDFS were determined.View full abstractDownload PDF (2139K)
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