JOURNAL of the JAPANESE SOCIETY of AGRICULTURAL MACHINERY
Online ISSN : 1884-6025
Print ISSN : 0285-2543
ISSN-L : 0285-2543
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Volume 55, Issue 1
Displaying 1-20 of 20 articles from this issue
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  • [title in Japanese]
    H. TERAO
    1993 Volume 55 Issue 1 Pages 1-2
    Published: 1993
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.55.1
    JOURNAL FREE ACCESS
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  • Fffects of Fuel Delivery Calibrators on Full Load Performance of Tractor PTO (Part 1)
    Torque Spring Apparatus
    Jiaolong LIU, Kei NAKAJI, Jun SAKAI
    1993 Volume 55 Issue 1 Pages 3-11
    Published: 1993
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.55.3
    JOURNAL FREE ACCESS
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    Two types of fuel delivery calibrators, namely the torque spring apparatus and the angleich apparatus, are generally used as attachments to the engine governor in order to improve the tractor PTO performance, especially the full load performance. The purpose of this research is to clarify the relationship between the fuel delivery calibrators and the tractor full load performance, and then, discuss the design principles of the full load performance. Upon the analysis of the experimental results of eleven tractors of about 15kw, it was evident that there existed a large difference in the design considerations and methods for the full load performance. The effect of each element of the torque spring apparatus on the full load performance was investigated experimentally and the relation of torque spring apparatus and governor mechanics was analyzed theoretically. In the next paper, another fuel delivery calibrator, i. e., the angleich apparatus, will be dealt with.
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  • Maneuverability of a Tractor-Trailer Combination (Part 1)
    Adaptation of Predictive Model to an Articulated Vehicle
    Ryo TORISU, Junichi TAKEDA, S. W. MUGUCIA
    1993 Volume 55 Issue 1 Pages 13-21
    Published: 1993
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.55.13
    JOURNAL FREE ACCESS
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    In order to interpret the handling characteristics of a tractor-trailer combination, human operator describing functions, based on kinematics and classical control theory, are proposed. Linearized vehicle equations representing the relationship between the steering angle and other state variables, are introduced. Using these equations, the behaviour of the operator-vehicle system, from the standpoint of control engineering and under a lane change situation, is investigated through computer simulation. The results are compared with experimental data taken from several people operating a tractor-trailer combination. The way a man operates a tractor-trailer combination is thereby clarified.
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  • Studies on Minimum Tillage Tools (Part 2)
    Field Experiments on Tine Implements
    Shun-nan SHEN, Osamu KITANI, Tsuguo OKAMOTO, Satoshi YONEKAWA, Naoki S ...
    1993 Volume 55 Issue 1 Pages 23-31
    Published: 1993
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.55.23
    JOURNAL FREE ACCESS
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    In this part, field experiments were conducted to confirm the results obtained from the soil bin experiments and also to examine the difference of force and soil failure caused by single and multiple tines. It was indicated that the results from soil bin and the results from field experiments gave a good agreement. It was cleared that the specific draft of multiple tines was smaller than that of single tine. The increment of the specific draft of multiple tines due to increase in working speed was also smaller than that of single tine. The soil pulverization was measured by means of image processing. The results were confirmed that the soil pulverization rate of spring-tine was higher than that of rigid tine.
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  • Study on the Soil Fumigator for Distributing Granular Nematicides into Soil (Part 1)
    Performance Characteristics of the Screw Feeder for Distributing the Powdered and Granular Nematicides
    Masafumi MITARAI, Jun SAKAI, Toshio FURUCHI
    1993 Volume 55 Issue 1 Pages 33-41
    Published: 1993
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.55.33
    JOURNAL FREE ACCESS
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    The purpose of this study is to develop a screw type feeder for distributing powdered and granular nematicides into soil. The performance characteristics and the practicality of the feeder were investigated. The following restlts were obtained:
    The coefficients of variation of delivery rates were smaller than 5%, though the performance of the screw feeder was effected by the rotational cycles of the screw shaft. It was proved that the screw feeder is suitable for feeding out powdered and granular nematicides, if the form and size of screw were selected and operated at the proper speed corresponding to the physical properties of materials. A screw pitch of 18.7cm and a radial clearance of 2.0mm were found to be suitable for feeding powder and small granules.
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  • Studies on Drum-type Fluidized Dryer for Grain (Part 2)
    Jinzo NAGAHIRO, Ken HIGUCHI, Yasushi WATANABE
    1993 Volume 55 Issue 1 Pages 43-50
    Published: 1993
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.55.43
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    Many experiments, following the first report by the authors, were carried out to investigate the drying performance of the drum-type fluidized dryer by drying wheat and soybean. The newly-developed dryer showed such results that (1) the optium drying condition for wheat was T=40-45°C, Qr=0.06m3/(s·100kg), (2) for soybean T=2-27°C, Qr=0.06m3/(s·100kg), (3) the low probability of damaged and cracked grain was proved, and that (4) the mixture of soybean, chaff, and ricebran fluidized by rotation could polish the soybean well.
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  • Drying Characteristics of Soybeans
    Satoshi MURATA, Toshio KAWANO, T. ENOMOTO
    1993 Volume 55 Issue 1 Pages 51-56
    Published: 1993
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.55.51
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    Samples of about 100g of soybeans, variety “TAMAHOMARE”, were conditioned to 35% moisture content (w. b.) and single layer drying tests were made for 72hours at 30, 40, 50 and 60°C and humidity in the range of 20 to 70 percent (RH). The sample pan section was 150mm in diameter with a 5mm opening screen replacing the bottom and air flow rate set at 10m3/h (0.157m/s).
    Having plotted the free moisture ratios on the semilogarithmic paper versus drying time, the intercept of asymtotic straight line of the curvature became to 0.69.
    For this reason, an infinite cylinder model was presented and quite good agreement was obtained between the experimental results and the model predicions.
    The drying rate coefficients K2(1/h) estimated from those experimenal data were resolved into Arrhenius type equation as follows;
    K2=482.48·exp(-2583.6/T)
    Standard deviation 1.19×10-3(1/h)
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  • Drying of Buckwheat and Estimation of its Quality (Part 2)
    Drying Characteristics of Buckwheat by Dehumidifying Drying System
    Chang Le WEI, Kazuo MORITA, Shoji TAHARAZAKO, Sumio HAYASHI
    1993 Volume 55 Issue 1 Pages 57-65
    Published: 1993
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.55.57
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    A dehumidifying drying system for buckwheat with high moisture content just after harvesting was developed and its performance was discussed. The dehumidifying coefficient Kw was calculated with the change of dehumidified water under the various conditions of air temperature and humidity. The efficiency of heat pump dehumidifier and drying rate of buckwheat were investigated at each drying period. The critical limits of air temperature and humidity for the utilization of the heat pump dehumidifier were obtained in practical use. The dehumidified water could be estimated according to the relationships between drying condition and consumed energy of dehumidifying drying system.
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  • Studies on Firmness Measurement of Fruit by Impact Force
    Kenji IMOU, Hiroshi MORISHIMA, Yasuhisa SEO, Tatsuya SAWADA
    1993 Volume 55 Issue 1 Pages 67-74
    Published: 1993
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.55.67
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    The impact force of fruit falling on a flat plate was investigated as a means for quick and nondestructive quality detection. Dependence of the impact force on mass, impact velocity and mechanical properties of the fruit were shown theoretically. A method of calculating a parameter which indicates the fruit firmness was proposed. It is calculated from the impact force and mass of the fruit. It is not necessary to determine the impact velocity. Experiments were made on kiwifruit. The impact forces at various stages of maturity were measured and analyzed. Simultaneously firmness was measured by a nondestructive fruit firmness meter. Sugar content and titratable acidity were also measured. The relationships between the firmness index obtained from the impact force and the other measurements were shown.
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  • Nondestructive Measurement of Fruits Quality by Electrical Impedance (Part 3)
    Internal Quality Evaluation by Immersion Comparsison Method
    Koro KATO
    1993 Volume 55 Issue 1 Pages 75-83
    Published: 1993
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.55.75
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    The celluar tissue change caused by ripening or rot appears as a change in the electrical properties. We have developed a simple method, which can measure the average electrical characteristics of fruits nondestructively, at the low frequency range in which the difference of quality appears clearly, without influence of the size or shape of the fruits. By this method, we measured the electrical characteristic of the fruits in a water container which has electrodes on both sides, and evaluated the quality of fruits by comparison with the electrical characteristic of the water. We investigated the applicability of this method for peaches, persimmons and pears. It became clear that the average electrical characteristics of fruits can be measured without influence of the size or shape of the fruits after examining the impedance characteristics of the water-fruits system, and the quality of fruits can be evaluated nondestructively.
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  • Studies on Storage and Ripening of Kiwifruit (Part 2)
    Tatsuya SAWADA, Yasuhisa SEO, Hiroshi MORISHIMA, Yoshinori KAWAGOE
    1993 Volume 55 Issue 1 Pages 85-91
    Published: 1993
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.55.85
    JOURNAL FREE ACCESS
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    This study was done to nondestructively evaluate and control fruit quality of kiwifruit during storage and ripening. As a result, cumulative quantity of evolved CO2 was expressed as a function of the temperature and the period of storage and ripening. Although the difference in the storage temperature affected cumulative quantity of evolved CO2, weight loss and incidence of soft rot lesions, it didn't have any effect on the changes in titratable acid and sugar content. By measuring cumulative quantity of evolved CO2, it was possible to predict flesh firmness and titratable acid. Moreover the technique to get the best quality of ripened kiwifruit by controlling storage and ripening was shown.
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  • Effect of Electric Field on Culture Multiplication of Tissue-cultured Plant
    Masaki MATSUO, Toshitaka UCHINO
    1993 Volume 55 Issue 1 Pages 93-100
    Published: 1993
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.55.93
    JOURNAL FREE ACCESS
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    The mint plantlets were continuously exposed to three kinds of electric field made by the sign lighting transformer, DC positive and negative high voltage power source during culture period. The effect of the electric field on the growth of plantlets was investigated.
    The difference of the mint growth owing to the kind of power source was found. In any power source the growth of plantlets exposed to the electric field of ca. 75kV·m-1 was promoted and the exposure to lower or stronger field inhibited their growth. Therefore, it seems that there is the optimum electric field strength for the enhancement of the growth.
    Both enhancement and inhibition of plant growth on account of field exposure were remarkable at the root rather than the top.
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  • Hand-tractor Driven Weeder for Interhill Space of Paddy Rice (Part 1)
    Structure and Action of Weeder Built as a Trial
    Tashio FURUCHI, Masafumi MITARAI
    1993 Volume 55 Issue 1 Pages 101-107
    Published: 1993
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.55.101
    JOURNAL FREE ACCESS
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  • Accuracy of Near-Infrared Reflectance Spectroscopy in Determining Constituent Content of Grain (Part 3)
    Moisture, Protein and Oil of Hokkaido-grown Soybean
    Motoyasu NATSUGA, Shuso KAWAMURA, Kazuhiko ITOH
    1993 Volume 55 Issue 1 Pages 109-115
    Published: 1993
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.55.109
    JOURNAL FREE ACCESS
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  • The Newest Status of Rice Breeding
    Yoshihiro AKAMA
    1993 Volume 55 Issue 1 Pages 117-121
    Published: 1993
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.55.117
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    K. NISHIZAKI
    1993 Volume 55 Issue 1 Pages 124-126
    Published: 1993
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.55.124
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1993 Volume 55 Issue 1 Pages 127-131
    Published: 1993
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.55.127
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    1993 Volume 55 Issue 1 Pages 132-136
    Published: 1993
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.55.132
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    1993 Volume 55 Issue 1 Pages 137-141
    Published: 1993
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.55.137
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1993 Volume 55 Issue 1 Pages 142-146
    Published: 1993
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.55.142
    JOURNAL FREE ACCESS
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