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Volume 50, Issue 5
Displaying 1-17 of 17 articles from this issue
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1988 Volume 50 Issue 5 Pages 1
Published: 1988
Released on J-STAGE: April 30, 2010
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S. Watanabe1988 Volume 50 Issue 5 Pages 3-4
Published: 1988
Released on J-STAGE: April 30, 2010
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K. Umeya1988 Volume 50 Issue 5 Pages 5-6
Published: 1988
Released on J-STAGE: April 30, 2010
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Effect of working conditions and shape of chisels on the performance of soil loosening machineKazuto SHIGETA, Seiichi NAKA, Kouichirou OKAZAKI, Hideto YAMAKAWA1988 Volume 50 Issue 5 Pages 7-15
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSFor the improvement of soil physical properties and the reduction of draft, soil loosening machine using compressed air was developed. Air blast from the nozzle port at the tip of chisel make cracks in soil pan. Field tests were conducted for 7 sorts of chisels to evaluate the effect of soil loosening and the reduction of draft. By using the chisel whose ratio of cross sectional area (S2/S2) is 2.0 and the length is 30cm, draft was reduced by 20% and the cone penetration resistance at the depth from 20cm to 40cm was reduced by 53% compared with non air blastView full abstractDownload PDF (3237K) -
The Approximation of the Clod Size Distribution by Weibull's, Gaudin-Shuhmann's and some other DistributionsShoji MORIIZUMI, Naotaka HAYASHI1988 Volume 50 Issue 5 Pages 17-24
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to facilitate quantitaive analysis of a clod size distribution, it is necessary to express the clod size distribution with a function. We discussed the approximation of the clod size distribution by Rayleigh's distribution in our first report. The present report is concerned with the results of the approximation of the clod size distributions by log-normal, Rosin-Rammler's, Gaudin-Shuhmann's and Weibull's distribution in three experiment places (diluvial upland field, paddy field of alluvial plain and diluvial upland).
The approximation of the clod size distribution by Rosin-Rammler's and Gaudin-Shuhmann's distribution gave good results in a partial experiment place. In case of the approximation by Weibull's distribution, we obtained satisfactory results by means of changing the value of its shape parameter in three experiment places where soil texture differs. Moreover, the sample mean and standard deviation of Weibull's distribution can be expressed in terms of a simple algebraic equation in comparison with other distributions. From the experimental results, it was concluded that Weibull's distribution formula was optimum as an approximation formula of the clod size distributions.View full abstractDownload PDF (1055K) -
Nobutaka ITO, Xiu-Lun WANG1988 Volume 50 Issue 5 Pages 25-30
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIt was previously pointed out by one of the authors that reduction of the turning motion resistance of the tracked vehicle can be performed drastically and effectively by the application of pivot mechanism to the braked track. It can de said from this that the turning motion resistance can be controlled by controlling the contact area of the braked track. In this case the contact length of the braked track could be practically controlled in so doing. The effect of the location of pivot point and the distance between both tracks on the turnability is discussed by use of the small scale model vehicle in this paper.View full abstractDownload PDF (743K) -
Akira OIDA1988 Volume 50 Issue 5 Pages 31-39
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to study the interaction between the ground and a running device of off-road vehicle, it is necessary to measure a three-dimensional reaction from the ground to an arbitrary point of a contact part of the running device. In this report, the property of a small-size three-axial transducer, which was produced to meet the above mentioned aim, is theoretically analyzed and its high performance is revealed by a calibration test.
Furthermore, this transducer was used to measure three-axial forces to some points of a track cleat of a snow car on the sandy soil. From the measurement results the usefulness of the transducer was clarified and some interesting phenomena of the force distributions along the track are also described in this report.View full abstractDownload PDF (1135K) -
Design concept and outline of the deviceYukiya KOBAYASHI1988 Volume 50 Issue 5 Pages 41-48
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSFor the automatic thinning at raising seedlings in vegetable farming, we developed a new pot-seedling thinner, in which a micro-computer and a photo-sensor were elaborately coupled. This device was attached to seedling boxes prepared for a transplanter, and consisted of a stem-sensor, the selection system of healthy stems, the cutting system of stems, and the control system of the whole device.
The results are as follows. The sensitivity limit of the stem-sensor is about 0.05mm, which is available for the actual stem discriminating operation.
The selection system operates effectively when stems are raised systematically.
The Knife-cuttion system requires stem interval more than 5mm.
This report describes the design concept and outline of the device. The performance of the stem-sensor and the results of the discrimination experiment will be published in the second report, and the performance of the cutting system of stems and the results of the thinning experiment will be published in the third report.View full abstractDownload PDF (1126K) -
Improvement of the wide swath fertilizer spreader and the particle motion analysis in the windJunichi SATO1988 Volume 50 Issue 5 Pages 49-56
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSSpreading performance of the wide swath fertilizer spreader which was modifid the shape and the number of turning blades was investigated.
The new blade being similar to a rectangle pipe decreased noise and vibration caused by blowing wind, and the new model of spreader with the pipe blades distributed granular fertilizer more uniformly than the previous model did with flat blades. And the model with 8 pipe blades was estimated the best distribution spreading widely and uniformly in other model with different number of blades.
To know the influence of the wind on the spreading pattern of particles, the experiments were conducted in a wind blowing forward and backward to particles. In forward wind of 3.9-6.5m/s the maximum throwing distance of large particles were 75m, and distribution patterns were more uniform than that in the backward wind or dead wind.
The computer simulation with three dimensional motion analyses defined the trajectory of particles affected by the wind. And it was revealed that a lot of particles which were discharged from blade with high angle at 70 to 80 degree were influenced wind considerably, and they swayed the distribution pattern of fertilizer particles on the feild.View full abstractDownload PDF (1225K) -
Drying Mechanism under Low Temperature and High Relative Humidity ConditionsSei-ichi OSHITA, Kenji NAKAGAWA, Kazuo HORIBE, Takaharu KAMEOKA1988 Volume 50 Issue 5 Pages 57-64
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDrying process of rough rice in a circulation type dryer was considered by examining the experimental data obtained from solar drying tests which were conducted under low temperature and high relative humidity conditions
From a macroscopic point of view, an exponential model involving a drying constant was used to show the change of moisture content of rough rice under tested conditions. The drying constant was determined by studying a moisture content curve whose characteristics were analogous to rice husk ones. A physical meaning of the drying constant was exhibited by using a drying model of rice husk, and a drying process of rough rice was explained well in a qualitative mannerView full abstractDownload PDF (1119K) -
Masayuki KASAHARA, Akinari INOHARA1988 Volume 50 Issue 5 Pages 65-72
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIt is necessary to establish the rational drying method that takes the moisture contents of a single giain into consideration. An apparatus for measuring the moisture contents of a single rice grain was made on an experimental basis, and the changes of distribution of the individual moisture contents of rough rices dried in a circulation type dryer were invesatigted with the use of the apparatus. The distribution of the individual moisture contents of harvested rough rice proved almost similar to normal distribution, and its range was about 10 per cent. When rough tice was dried, the shape of the distribution of individual moisture contents changed to the peaky and skewed to the low moisture contents with the lapse of drying time. The range became about 6 per cent after drying, and decreased further to 2 per cent with the continuous reserve during 12 to 24 hours in a bin after drying.View full abstractDownload PDF (1189K) -
Kazuo HORIBE, Yiping WANG, Takashi TOJOH1988 Volume 50 Issue 5 Pages 73-80
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to save drying energy in pelletizing process of woody blomass a drying procedure with solar energy was investigated in a firon-covered greenhouse. Firstly experiments of a radiation drying used the house were conducred and then the drying rates were expressed by experimental formulas. Secondly a forced-air drying was compared with the radiation drying and it was proved that the drying rates of the former were larger than those of the latter.
Therefore, the forced-air drying method was applied to the solar drying and the drying characteristics were examined in indoor experiments. In order to estimate the drying rates in various conditions the mathematical model of the drying was proposed and then the economical merits of the solar drying system were investigated by using of a simulation method.View full abstractDownload PDF (1214K) -
Takaharu Kameoka, Mituhiro Nakamura, Tetuya Inada1988 Volume 50 Issue 5 Pages 81-87
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn the previous paper, the significance of building prototype expert systems was confirmed. In this paper, another expert system was built by using PROLOG which is one of the AI language. As a result, user interface of this system was found to be more friendly than the previous one. Therefore it is recommended that SOGEN systems is suitable for prototype and PROLOG system for complete systems. In the complete systems, diagnosis data should be transferred and stored in a common data base, and it could be combined with an information net work for its effective utilization. Although only an expert systems were introduced here, the artificial intelligence technology will surely help agriculture in the near future.View full abstractDownload PDF (3327K) -
Noboru KAWAMURA, Koh TAKAKITA1988 Volume 50 Issue 5 Pages 89
Published: 1988
Released on J-STAGE: April 30, 2010
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S. MURATA, A. TAGAWA, S. ISHIBASHI1988 Volume 50 Issue 5 Pages 91-92
Published: 1988
Released on J-STAGE: April 30, 2010
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Background of Utilizing Rice TransplanterTadashi FURUYA, Tatsuya KONISHI, Sumihiko MIYAHARA1988 Volume 50 Issue 5 Pages 93-96
Published: 1988
Released on J-STAGE: April 30, 2010
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Drying Time under Heating by Extreme-infrared ray heaters placed above and under the bed of cocoonsYasuhisa SEO, Hiroshi MORISHIMA, Tsutato MIYAZAWA, Masato MIYAUCHI1988 Volume 50 Issue 5 Pages 97-101
Published: 1988
Released on J-STAGE: April 30, 2010
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