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Volume 33 (2002 - 200･･･
- Issue 4 Pages 217-
- Issue 3 Pages 155-
- Issue 2 Pages 83-
- Issue 1 Pages 1-
Volume 33, Issue 4
Displaying 1-6 of 6 articles from this issue
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Takaaki SATAKE, Shengwei CHANG, Sadao OMORI, Osamu FUJIOKA, Osamu SAKA ...2003 Volume 33 Issue 4 Pages 217-224
Published: March 25, 2003
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSIn China, grading of dried raisins is currently carried out by visual and manual sorting at packing houses. Therefore, an uniform graded shipment is still a serious problem because of differences in the evaluator's judgment and an indefinite definition of external qualities.
In this study, the external appearance such as shape and external skin color information of dried green raisins produced in China were measured using a general purpose machine vision system. Based on these measurements, the fundamental findings for development of a grading machine were obtained. Furthermore, the feasibility of grading using a color image sensor was evaluated. As a result, it was clear that dried green raisins could be sorted into three grades: excellent, fair and substandard at about a 91% comprehensive discrimination by appropriately setting a threshold value at the characteristic external skin color.View full abstractDownload PDF (6058K) -
Shinsuke FURUNO, Sadanori SASE, Masahisa ISHII, Keizo KAWAMURA, Kiyosh ...2003 Volume 33 Issue 4 Pages 225-231
Published: March 25, 2003
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSIn order to melt snow on the roofs of a four-span greenhouse, several methods using the heated air through ducts onto the internal roof surfaces using hot air heater were investigated.
The performance of melting snow decreased with the distance from the end of the horizontal duct under the roof for each method. This may have resulted from a decrease in air temperature and velocity in the horizontal ducts with the distance from the end of the horizontal duct under the roof. When the melting snow system was automatically turned off at an hour after it stopped snowing, no snow was observed on the roofs.
The maximum melting rate of snow during the experiment was 1.6kg/m2/h (38kg/m2/d), and corresponded with that for the 15-year return period expectation of snow load for the experiment site.View full abstractDownload PDF (2571K) -
Characteristics of ultra-sonic absorptionKazuo MORITA, Yasuhiro YAMAGUCHI, Fumihiko TANAKA2003 Volume 33 Issue 4 Pages 233-238
Published: March 25, 2003
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSIn order to develop an ultra-sonic drying system for agricultural products, an ultra-sonic drying device with ultra-sonic generation plate, 19.5KHz, was designed and its performance was investigated. This paper focuses on the absorption characteristic of ultra-sonic wave into the layer of rough rice during drying period. Ultrasonic absorption properties of rough rice were measured at sound pressure level between 141.1 and 158.3dB, and layer thickness from 0 to 120mm. The sound pressure level decreases exponentially with traveling length and its energy was translated to heat energy in the rough rice layer.View full abstractDownload PDF (639K) -
Ultra-sonic drying characteristicsKazuo MORITA, Yasuhiro YAMAGUCHI, Fumihiko TANAKA2003 Volume 33 Issue 4 Pages 239-245
Published: March 25, 2003
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSIn this study, the drying characteristics of rough rice were investigated in ultra-sonic drying process. The drying tests were carried out using a ventilation dryer with ultra-sonic generating system. The drying rate of rough rice was accelerated when ultra-sonic was radiated. This can be supposed as thermal and non-thermal effects of ultra-sonic wave. The moisture content distribution in rough rice layer was measured at various ultra-sonic radiation power levels. The results revealed that it was differ from the moisture distribution during ventilation drying process. The quality evaluation was carried out using a “Mido Meter” that could measure the surface “gloss” of cooked rice. From this experiment, it was revealed that the ultra-sonic dried rice scored higher point.View full abstractDownload PDF (2021K) -
Kyoichiro YOSHIDA, Jung-Sik MIN, Jung-Bok PARK, Seiichiro ISOBE, Tetsu ...2003 Volume 33 Issue 4 Pages 247-253
Published: March 25, 2003
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSIn this paper, we disinfected P. glumae using an agar block with electrolyzed water. After treatment, we examined the disinfection effectiveness by scanning electron microscopy and fluorescent microscopy to evaluate the method for application to agricultural fields. We also examined rice seeds. Electrolyzed water was used to establish an effective disinfectant to reduce environmental pollution. In the model experiment, we confirmed that the acidic electrolyzed water was highly effective for sterilization compared with other treatments. We could observe a difference in the microbes remaining and from surface observation. In the experiment of disinfecting rice seeds, however, it became clear that a device for use in the processing method is required to preserve the sterilization effect.View full abstractDownload PDF (3812K) -
Characteristics of composting using vacuum-type aerationYoshiyuki ABE, Naoki FUKUJYUU, Nobuo ITO, Mikio KAMO2003 Volume 33 Issue 4 Pages 255-261
Published: March 25, 2003
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThe use of vacuum-type aeration (VTA) as a technique for composting was evaluated to develop a low-environmental load composting system. For this study, we designed an experimental system that was equipped with 431L (effective volume) reactor, and that was able to collect total ammonia from the exhaust gases. The VTA system produced compost of a similar quality to that produced by positive-pressure aeration (PPA), in terms of variation of temperature and degradation level of VS; however, fermentation in the VTA system took place at a slightly higher temperature than that in the PPA system. VTA could vacuum sufficient ammonia from compost so that almost no ammonia was emitted from the VTA compost surface. However, as waste fluid was generated from the compost during VTA composting, further experiments are needed to clarify the volume and appropriate treatment of the generated waste fluid.View full abstractDownload PDF (2076K)
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