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Volume 51, Issue 4
Displaying 1-17 of 17 articles from this issue
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T. KUWANA1989 Volume 51 Issue 4 Pages 3-4
Published: 1989
Released on J-STAGE: April 30, 2010
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Tsuguo OKAMOTO, Osamu KITANI, Ikjoo JANG1989 Volume 51 Issue 4 Pages 5-13
Published: 1989
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA remote monitoring system with digital radio communication for tractor works was developed and tested to carry out of measurering tractor's working condition operated in fields. A handheld computer which was mounted on the tractor was used for processing measured data and for controlling digital data communication. The measured data which were received by a radio receiver of the station located in the outside of field were calculated and analyzed immediately. Thereafter, the results were displayed on a monitor CRT connected to personal computer. To select the items to be measured, to set the sampling period and the transmitting interval, and to start and to stop the measurement, the several commands were sent from the monitor station to the tractor station and its measuring system was controlled by the handheld computer on the tractor. The digital data communication in packet radio was operated with F2 radio wave mode and 1200 in baud rate between stations. AX. 25 was used as the packet radio protocol.View full abstractDownload PDF (1348K) -
Two-Mirror Method using Plane MirrorYoshinobu OHTA, Tatsuo HIROMA1989 Volume 51 Issue 4 Pages 15-23
Published: 1989
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSFrom a viewpoint of improvement of the working environment around the tractor operator, one method that the operator is able to obtain the visual information on the rear of tractor while the operator keeps looking forward, was discussed in this study. In this method two mirrors, i. e. a large upper mirror and a small front one were used.
In part 1, the relationship between the indirect visual range on the rear of tractor and the size, the location and the installed angle of mirrors were analyzed in case of the plane mirror. The results of field test were also reported, which were carried out by comparing the two-mirror method with the conventional method.
In part 2, the two-mirror method using the convex mirror will be discussed. In part 3, the actual visual range and the distortion of image on the mirror in case of two-mirror method will be discussed in comparison with the rear view mirror on the tractor.View full abstractDownload PDF (3636K) -
Development of Test Devices for Mechanical Properties of Soil and Cutting Test of Soil by Double-Blade Moldboard PlowIkjoo JANG, Osamu KITANI, Tsuguo OKAMOTO1989 Volume 51 Issue 4 Pages 25-32
Published: 1989
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA series of studies were conducted to develop a double blade moldboard plow which has a sub blade in front of moldboard and break the soil with relative movement of the sub blade and share. In the first part of these studies, basic studies were made to develop a test device to measure mechanical properties of soil, especially tensile strength of soil by using co-axial cylinders. A series of basic soil cutting tests were made by double blade tillage device in a soil bin to find optimal sub blade position with minimum power.View full abstractDownload PDF (3579K) -
Toshitaka UCHINO, Masaki MATSUO1989 Volume 51 Issue 4 Pages 33-39
Published: 1989
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA vertical wire electrode and a concentric collector ring were installed in a small film plastic greenhouse, water contained red dye was sprayed into the greenhouse by a non-heating fog machine.
Corona discharge currents and deposit densities of charged droplets on the collector ring were measured. The smaller the collector ring radius and the electrode wire diameter, the greater the corona discharge current and the deposit density. The discharge current of the saw teeth rings electrode was larger than that of the wire electrode, and the ring elecrode currents of saw teeth and the gear teeth indicated the maximum value at 25mm interval of their rings. However, the effect of the interval on the deposit density was little. The deposit densities decreased with relative humidity, and increased with corona discharge currents but the increase rate of deposit density became gradually small. The deposition on some plastic materials used for greenhouses were smaller than that on an aluminum plate.
As mentioned above, available data for electrostatic fog deposition in greenhouses were obtained.View full abstractDownload PDF (1034K) -
Investigation of Method of Combination Visual Feedback with Method of Detecting by Visual Sensor Moving toward FruitNaoshi KONDO, Shunzo ENDO1989 Volume 51 Issue 4 Pages 41-48
Published: 1989
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn the Part I of this series of study, a fruit detecting experiment by visual feedback and a computer simulation by method of detecting by visual sensor moving toward fruit were done and the calculation accuracy was investigated. From these results, it was considered that if these methods were used not independently but together to make use of each characteristic, they could become effective.
In this paper, the characteristics of both methods and a method of combinaton both methods were investigated and the effectiveness was proved by a computer simulation and an experiment using a telescopic arm.View full abstractDownload PDF (4002K) -
Yasumasa KOGA1989 Volume 51 Issue 4 Pages 49-55
Published: 1989
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSPostharvest processing is fundamentally different from crop production process on such point that the latter is basically of natural process which helps plants to grow by supplementing the environmental conditions whereas the former is purely of artificial one and similar to industrial production.
This makes great difference on the functions of agricultural machinery applied for the both cases: field machinery is basically for labor-saving and postharvest machinery not only for that but also for quality improvement of the products.
Where higher quality product is sold with equally higher price, postharvest machinery can be profitable regardless of labor cost. For utilizing them, however, for the small-scale rice farmers in Asia, joint-ownership/operation is required.
Establishment of the objective quality standards for the products facilitates joint marketing of the products by farmers.
Both of these would strengthen farmers' solidarity and cooperation, improving their economical and social conditions.
Farmers' positive involvement into commercial transaction will make them feel the necessity of literacy and access to information. Together with discipline acquired through cooperation and technical skill by machine-use, farmers can thus be prepared for being modern industrial workers.View full abstractDownload PDF (1390K) -
Satoshi MURATA, Akio TAGAWA, Toshio KAWANO, Sadato ISHIBASHI1989 Volume 51 Issue 4 Pages 57-61
Published: 1989
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIt is important to predict the rate of moisture transfer among the cereal grain from the standpoint of practical use because the grains are sometimes mixed with the dried stored grains at commercial grain drying facilities called Rice Center and Country Elevator in the case of the excess in the capacity.
A simulation model, as well as drying, was based on diffusion. However, the model is characterized with the existence of constant equilibrium moisture content between wet and dry grains, the second kind boundary condition, and the existence of the hysteresis in absorption and desorption of moisture.
The calculated moisture reductions and increases are agreed very well with the experimental results which we observed for five temperatures and a combination of initial moisture contents.View full abstractDownload PDF (702K) -
Akihiko ONODA, Kenji YAMAMOTO, Tadashi FURUYA, Hideto YAMAKAWA, Kiyohi ...1989 Volume 51 Issue 4 Pages 63-70
Published: 1989
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe odjective of this study is to develop a storage technique which retains the quality of cabbages during storage. The storage apparatus consisted of insulated plastic containers placed on the top of a ventilated wooden box.
A fan and valves were employed to circulate cold air throughout the apparatus. The timer controlled fan expelled the cold air through an exhaust valve and at same time drew fresh cold air to the apparatus through an intake valve. The valves closed and the ventilation cycle was completed. The fan remained on for approximately 1 or 2 minutes to thoroughly circulate the air throughout the apparatus. The fan then stopped and the apparatus became air tight.
The apparatus was able to retain the quality of stored cabbages for about two months, ventilating only once a day. We concluded that the ventilated system was better than the non-ventilated one.View full abstractDownload PDF (1271K) -
New Procedure and Husking CharacteristicsRitsuya YAMASHITA, S. J. OMAR, Kiyokazu GOTO1989 Volume 51 Issue 4 Pages 71-75
Published: 1989
Released on J-STAGE: April 30, 2010
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Toshinori KIMURA, Hiroshi SHIMIZU1989 Volume 51 Issue 4 Pages 77-81
Published: 1989
Released on J-STAGE: April 30, 2010
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[in Japanese]1989 Volume 51 Issue 4 Pages 83-88
Published: 1989
Released on J-STAGE: April 30, 2010
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[in Japanese]1989 Volume 51 Issue 4 Pages 89-92
Published: 1989
Released on J-STAGE: April 30, 2010
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[in Japanese]1989 Volume 51 Issue 4 Pages 93-95
Published: 1989
Released on J-STAGE: April 30, 2010
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[in Japanese]1989 Volume 51 Issue 4 Pages 97-98
Published: 1989
Released on J-STAGE: April 30, 2010
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Hiroshi TANAKA1989 Volume 51 Issue 4 Pages 99-104
Published: 1989
Released on J-STAGE: April 30, 2010
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...1989 Volume 51 Issue 4 Pages 105-128
Published: 1989
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (3483K)
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