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Volume 65, Issue 2
Displaying 1-20 of 20 articles from this issue
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N. YAMANA2003 Volume 65 Issue 2 Pages 1-2
Published: March 01, 2003
Released on J-STAGE: April 30, 2010
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Shuichi SHIMIZU2003 Volume 65 Issue 2 Pages 4-7
Published: March 01, 2003
Released on J-STAGE: April 30, 2010
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Hiroyuki CHIBA2003 Volume 65 Issue 2 Pages 8-11
Published: March 01, 2003
Released on J-STAGE: April 30, 2010
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Nobuo OYAMA2003 Volume 65 Issue 2 Pages 12-15
Published: March 01, 2003
Released on J-STAGE: April 30, 2010
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Yasuo ASAKAWA2003 Volume 65 Issue 2 Pages 16-19
Published: March 01, 2003
Released on J-STAGE: April 30, 2010
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K. NAGAYA2003 Volume 65 Issue 2 Pages 20-22
Published: March 01, 2003
Released on J-STAGE: April 30, 2010
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Y. KUJI2003 Volume 65 Issue 2 Pages 23-25
Published: March 01, 2003
Released on J-STAGE: April 30, 2010
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Applicable to Unequal Row Spacing PatternK. AMAHA2003 Volume 65 Issue 2 Pages 26-28
Published: March 01, 2003
Released on J-STAGE: April 30, 2010
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H. YOSHITOMI2003 Volume 65 Issue 2 Pages 29-31
Published: March 01, 2003
Released on J-STAGE: April 30, 2010
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Yasumaru HIRAI, Eiji INOUE, Masami MATSUI, Ken MORI, Koichi HASHIGUCHI2003 Volume 65 Issue 2 Pages 47-55
Published: March 01, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn the present study, the reaction force of a wheat stalk undergoing forced displacement, which was one of the important deflection characteristics, was clarified by experiment and theory. First, the horizontal and vertical reaction forces of a single wheat stalk undergoing forced displacement were measured. The horizontal force increased linearly together with increment of the forced displacement, while the vertical force had different tendencies depending on the initial posture of a wheat stalk. From experimental results, it was examined that a main reason of differences in the tendencies of the vertical force was a directional change of friction depending on the initial posture. Therefore, a differential equation describing deflection, taking into account the initial posture of a wheat stalk, was derived based on a mechanical model of a crop stalk and used for analysis of the reaction forces. In this analysis, the effect of friction was also considered. The analytical results agreed well with measured values, and it was shown that the reaction forces of the wheat stalk according to the initial posture was analyzed accurately utilizing the derived equation.View full abstractDownload PDF (3534K) -
Yasumaru HIRAI, Eiji INOUE, Masami MATSUI, Ken MORI, Koichi HASHIGUCHI2003 Volume 65 Issue 2 Pages 56-63
Published: March 01, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe differential equation describing deflection, taking into account the initial posture of a wheat stalk, was derived in the previous study. Based on it, the reaction forces and posture of a bunch of wheat stalks were analyzed. First, because deflection characteristics of the wheat stalk undergoing forced displacement depend on its initial posture, the assessment parameter of posture of a bunch of wheat stalks was introduced, and the initial posture was simulated. Further, the reaction forces of a bunch of wheat stalks undergoing forced displacement were analyzed according to their simulated initial posture. The analytical results agreed well with measured values, and it was demonstrated that the reaction forces involving the effects of the initial posture were predicted specifically in the case of a bunch of wheat stalks. In the present paper, the posture of the wheat stalk undergoing forced displacement was also investigated, and the analysis regarding a bunch of wheat stalks was discussed.View full abstractDownload PDF (5537K) -
Daisuke HAMANAKA, Toshitaka UCHINO, Wenzhong HU, Eriko YASUNAGA, Hussa ...2003 Volume 65 Issue 2 Pages 64-70
Published: March 01, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe effects of infrared radiation on the microorganisms on wheat and soybean surface were investigated. Infrared radiation was an effective method to reduce the viable counts of these microorganisms in a short time. It appeared that the internal quality of cereal grains would be preserved since the intermittent irradiation could avoid high temperature of cereals surface, and reduce the viable counts effectively same as continuous irradiation. Moreover, it was estimated that the main mechanism of the sterilization by infrared radiation applied to these cereal was not the heat transfer by thermal conduction between the cereal surface and microorganisms, but the direct heating to these microorganisms by thermal radiation, because the surface temperature of wheat was 50°C higher than that of soybean by the irradiation of 7s.View full abstractDownload PDF (3341K) -
Tetsuo KATAYAMA, Kenji IMOU, Tsuguo OKAMOTO, Yutaka KAIZU, Kousuke TSU ...2003 Volume 65 Issue 2 Pages 71-76
Published: March 01, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThree-dimensional shape features were examined for the distinction of the strawberry shape. First, the three-dimensional coordinates were calculated using a three-dimensional shape entry machine. From the coordinates, eight parameters were proposed. The classification was not adequate when using only one parameter. So, several parameters were selected using step wise decision. The Bayes' estimate and neural network were performed according to the selected parameters. As a result, the agreement percentage with the judgement by the act of man exceeded 90%.View full abstractDownload PDF (2632K) -
Akira TANAKA, Shun-ichiro TANAKA, Fumihiko TANAKA2003 Volume 65 Issue 2 Pages 77-84
Published: March 01, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIt is important to evaluate the connective heat transfer for the prediction of food temperature in refrigerated warehouses, or the thermal design of facilities. In this paper, in order to predict accurately the convective heat transfer, we try to introduce to the low Reynolds number type k-ε model, which can predict continuously from the viscous bottom layer to transition region, turbulent region and the WET model, which can accurately approximate the turbulent heat flux. To verify the numerical model, the distribution of air velocity, temperature, turbulent energy were simulated by two dimensional analysis for natural convection in enclosed space. As a result, simulated results agree with the past experimental results. The prediction of local Nusselt number also agree with the experimental results. The numerical model was confirmed to have applicability by the comparison with the experimental data.View full abstractDownload PDF (999K) -
Rabiul ISLAM, Naoto SHIMIZU, Singo FURUICHI, Toshinori KIMURA2003 Volume 65 Issue 2 Pages 85-93
Published: March 01, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA laboratory-scale experimental setup was fabricated to produce parboiled rice at lower temperatures (80, 90 and 100°C) to determine cooking qualities for different processing conditions and sample sizes (75, 120, 200 and 400g). The cooking qualities, such as water uptake value, solid content in the cooking gruel and cooking time of parboiled rice, were investigated. The cooking time of parboiled rice can be determined at the water uptake value of 2.5. The water uptake value and solid content decreased, and cooking time of parboiled rice increased according to the severity of the heat treatment in the parboiling process. A good linear relationship between the thermal property and cooking time clarified the cooking behavior of parboiled rice. A cooking time of 20 to 24min was obtained for the improved quality of parboiled rice produced at the processing conditions of 90°C-30min and 100°C-10min. It was assumed that for the respective cooking time, cooked under identical conditions, all parboiled rice might show the distinct level of solid contents.View full abstractDownload PDF (4148K) -
Yoshinari MORIO, Yoshio IKEDA, Kazuo HORIBE2003 Volume 65 Issue 2 Pages 94-100
Published: March 01, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSWe presented a Holstein cow identification method and considered its robustness against various lighting conditions. The method divided a pattern region into many blocks and made the feature vector of each cow using the 0 or 1 number coded by a sign of the brightness difference between neighboring blocks. In the experiment, Euclid distance, cosine and normalized correlation was used for identification on eigenspace spanned by KL expansion. As the result, the sign coding method was more robust against various lighting conditions than the non-coding method, but a small positioning error of an identified pattern region caused its recognition performance to degrade. A new method with high robustness against the positioning error as well as various lighting conditions must be developed for practical use in natural scene.View full abstractDownload PDF (8020K) -
Dependence of specific growth rate of microorganisms on temperatureFumihito MIYATAKE, Kazunori IWABUCHI, Toshinori KIMURA2003 Volume 65 Issue 2 Pages 101-105
Published: March 01, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to find the most activated temperature of composting microorganisms, dependence of specific growth rate (μ) on temperature was investigated. The composting studies were carried out in an adiabatic reactor of one litre capacity with fresh cattle manure, which was corrected from a University farm. The manure was subjected to composting reaction after dehydrating to 60%w.b. by an electric fan. The μ was calculated from measured oxygen uptake rate of the manure. The results obtained that the maximum of μ was found to be at approximately 54°C. The maximum composting rate generally observed at 60°C are attributed to the maximum number of microorganisms which is a consequence of the drastic growth at the most suitable temperature of 54°C.View full abstractDownload PDF (635K) -
Measurement of Physical Properties of Seedlings and Examination for Mechanization of Planting OperationMitsuji MONTA, Jun SUYAMA2003 Volume 65 Issue 2 Pages 106-112
Published: March 01, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn rush seedling production system, plug seedlings have been widely popularized. However, the planting operation requires a great deal of labor and takes a long time because seedlings with a few main stems and a bud are picked from mother plants and are planted into the tray one by one by manual operations. Therefore, it is desirable to introduce machinery into the planting operation. The purpose of this study is to develop a planting machine for rush seedlings. In this paper, physical properties of seedlings were measured to obtain basic data for designing the machine. Furthermore, specifications and functions of the machine were examined based on the results of measurements.View full abstractDownload PDF (3767K) -
Manufacture of Planting Machine and Performance TestMitsuji MONTA, Jun SUYAMA2003 Volume 65 Issue 2 Pages 113-119
Published: March 01, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn the part 1 of this series, physical properties of rush seedlings were measured to obtain basic data for manufacturing a planting machine. Furthermore, functions and specifications of the machine were examined based on the result of measurements. In this paper, the planting machine was manufactured and tested. The machine mainly consisted of a planting part moved vertically, a sliding table of tray and a controller. From the results of performance tests, the success rates were around 90%.View full abstractDownload PDF (2690K) -
Chiyuki TOGASHI, Kazuhiro MATSUMORI2003 Volume 65 Issue 2 Pages 120-125
Published: March 01, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe size of droplets of vegetable oil spray injected from the injection nozzle plays a significant role in the performance of diesel engines. Three kinds of the injection nozzles are used according to type of the combustion chamber the diesel engine: pintle, throttle and hole nozzles. In the experiments we used these nozzles and, as substitution fuels, vegetable oil and the mixture of diesel oil and vegetable oil. This paper deals with the relationship between the droplet size of the injected spray and the injection pressure.
The results show that there was at each injection pressure a logarithmical relationship between the kinematic viscosity of fuels and the mean size of droplets of the spray injected from all injection nozzles. When the injection pressure increased the mean size of droplets decreased: 14MPa of the throttle nozzle, and 20MPa of the two kinds of hole nozzles seemed to be threshold value of the spray atomization respectively.View full abstractDownload PDF (880K)
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