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Volume 38 (2007 - 200･･･
- Issue 4 Pages 237-
- Issue 3 Pages 167-
- Issue 2 Pages 101-
- Issue 1 Pages 1-
Volume 38, Issue 2
Displaying 1-5 of 5 articles from this issue
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Nobutaka NAKAMURA, Hitomi UMEHARA, Hiroshi OKADOME, Kouhei NAKANO, Shi ...2007 Volume 38 Issue 2 Pages 101-108
Published: September 25, 2007
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThe effect of vibration frequency and directions on the damage of strawberries was evaluated under the acceleration level less than 1.0G. Under vertical vibration, the transmissibility between fruits and vibration table showed dependency on both acceleration and frequency, and the higher acceleration tended to cause a lower peak value and peak shift to lower frequency. Transmissibilities were found to be 1.0, 4.2, 2.6 for 5, 20, 30Hz at 0.6G, respectively. The damage degree of strawberries after vibration treatment showed similar pattern (20Hz>30Hz>>5Hz) as transmissibilities. On the other hand, strawberries were more damaged by horizontal vibration than vertical. These results indicate that damage occurrence of strawberries is affected by not only the acceleration level but also transmissibility and/or vibration direction.View full abstractDownload PDF (1069K) -
Makoto ABE, Xiaohui LEI, Takaaki MAEKAWA, Takaaki SATAKE2007 Volume 38 Issue 2 Pages 109-115
Published: September 25, 2007
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSIn this study, methane fermentation effluent was electrochemically treated with Ti/Pt-IrO2 and iron electrodes in two steps. Because of a high suspended solid concentration, methane fermentation effluent is generally pretreated by dilution or coagulation before electrochemical treatment. Targeting engineering applications, methane fermentation effluent was electrochemically treated in one cell without any pretreatment. Optimal running conditions under this experiment were investigated based on the efficiency of carbon (total organic carbon, inorganic carbon), nitrogen (ammonium nitrogen, nitrate nitrogen) and phosphorus (total phosphorus, ortho-phosphorus) removal.
The treatment process included two steps: Ti/Pt-IrO2 was used as an anode and, iron as a cathode in the first step. The anode and cathode were exchanged with each other in the second step. During the first step, HOCl produced on the Ti/Pt-IrO2 anode oxidized ammonium nitrogen to nitrogen gas. Furthermore organic carbon, suspended solids were also discharged from the cell by electro-flotation. In the second step, phosphorus and total carbon were removed by electro-coagulation. After these two treatment steps, 100%, 80% and 70% of ammonium nitrogen, total organic carbon and total phosphorus were respectively removed.View full abstractDownload PDF (890K) -
Kusumiyati, Takayoshi AKINAGA, Shigeyasu YONEMORI, Sheishi KAWASAKI, ...2007 Volume 38 Issue 2 Pages 117-126
Published: September 25, 2007
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThe use of a portable near infrared instrument was evaluated to determine the soluble solids content, moisture content, and hue color value of tomatoes on tree and after harvesting. Calibration models were constructed using data from the winter season and summer season in order to make the model as robust as possible. The 247 samples data were randomly split into 122 samples for calibration and 125 samples for prediction.
The results of the correlation coefficient (R) and standard error of calibration (SEC) values for the calibration model, which were obtained using the PLS regressions of the soluble solids content, moisture content and hue color value of the tomatoes after harvesting are 0.95 (0.26), 0.81 (1.85), and 0.94 (3.32), respectively. The positive and similar trend linear correlation of the calibration and prediction of the soluble solids content, moisture content, and hue color value from the winter season and summer season data is shown for the tomatoes on the tree and after harvesting, but have relatively differences in coefficient correlation. Based on the NIR measurement on the tree technique, the farmers can determine the harvesting time until the desired quality for example soluble solids content and reduce the sorting lose.View full abstractDownload PDF (1195K) -
Hideyuki TANAKA, Mihoko YABE, Toshimichi WATANABE2007 Volume 38 Issue 2 Pages 127-139
Published: September 25, 2007
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSIn recent times, there has been an increasing need to establish the traceability for most measurements. When the traceability of the measurement is established, it is necessary that measurement uncertainties are evaluated at every level of calibration. Measurement uncertainty represents the quantitative indication of the quality of the measurement result. The method for evaluating and expressing uncertainty is common throughout the world and measurand. In this study, we represented the sources of the uncertainty in the rice moisture content measured by the drying method, and the method used to evaluate a particular source of uncertainty. Then, we evaluated the uncertainty in the polished rice moisture content measured by the drying method. As a result, the moisture content of the polished rice measured by the drying method is represented by X=13.96%±0.13%, where the number following the symbol ± denotes the numerical value of an expanded uncertainty. The first major source of uncertainty was the deviation between the same types of grinders. The standard uncertainty between the grinders was 0.064%. On the other hand, the uncertainty in the mass measurements was sufficiently smaller than the expanded uncertainty. The standard uncertainty in the mass measurement was 0.005%. It can be stated that the expanded uncertainty will not be affected by the uncertainty in the mass measurements. From these results, it was possible to assign a numerical index of how precise the grain moisture measurement is as measured by the drying method. Also, because it is now possible to assign uncertainty for grains to calibrate grain moisture meters, this has opened the way for establishing traceability of grain moisture meters.View full abstractDownload PDF (1546K) -
JUN Li, Keo INTABON, Takaaki MAEKAWA2007 Volume 38 Issue 2 Pages 141-148
Published: September 25, 2007
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThe poly lactic (PLA) acid is regarded as a suitable environmental corresponding type material for the 21 centuries; the research and development of fiber, film, seat and resin etc are advanced rapidly. The aim of this research is to improve the plasticity of polylactic acid film. We tried to use low molecular weight plasticizer PEG to improve the polylactic acid film. With the addition of the plasticizer PEG, the tensibility of polylactic acid film is increased at one hand, the intensity and water vapor permeability are inclined to decrease on another hand. In the experiment, we also tried to use super grinded bagasse particle with a diameter of 40μm to increase the intensity and water vapor permeability, and also reduce the price of the polylactic acid film. The result showed that the bagasse particles improve the tensile yield strength and water resistance.
In addition, with comparison to the physical characteristic of commercial polyethylene film which filled with 30% CaCO3, the poly lactic acid filled with bagasse particle is proved to possess of almost the same characteristic as them.View full abstractDownload PDF (841K)
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