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Volume 57, Issue 2
Displaying 1-13 of 13 articles from this issue
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K. NAMIKAWA1995 Volume 57 Issue 2 Pages 1-2
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (2054K) -
Soil Bin Tests with Model PloughsKen ARAYA, Masayoshi KUDO, Tsukasa MAEKAWA, Satoshi TSUNEMATSU1995 Volume 57 Issue 2 Pages 3-11
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSBased on the field cultivation tests by Zhao and the soil investigations by Araya, one to one mixing of the second (Aw) and the third (B) horizons was conducted to improve planosol solum leaving the first (Ap) horizon undisturbed. This paper deals with the basic soil bin tests on soil mixing with half size model ploughs. It was found that a standing up plough and a dropping down plough can practically be used on the field, but a folding up plough can not practically be used because the furrow slices did not move smoothly on the moldboard.View full abstractDownload PDF (8014K) -
Masaru TOKUDA, Kiyoshi NAMIKAWA1995 Volume 57 Issue 2 Pages 13-20
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis paper presents a detecting algorithm of watermelon fruits to develop an automatic harvesting system by robot. In this study, methods to discern watermelon using color scale image or gray scale image utilizing specific spectrum were investigated. A method was investigated to extract the region of fruits, which hide behind leaves, by swaying them with air blast, through motion image processing. As the result, it was found that watermelon can be discerned by the gray scale image utilizing the spectrum where reflectance of black and green stripes on fruit surface are close, and the extraction of fruit hiding region was possible by using a sequential image of swaying leaves.View full abstractDownload PDF (10513K) -
Study on Adaptive FilterYankun PENG, Akira SASAO, Sakae SHIBUSAWA, Tomokazu YOSHIDA1995 Volume 57 Issue 2 Pages 21-28
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSUsing feedback type active-noise-control (ANC) techniques with sound interference effects, the reduction of noise level around the operator of agricultural machines was investigated. This paper describes new ANC systems including respective RLS (Recursive Least Square) and FAEST (Fast A-posteriori Error Sequential Technique) algorithms, where the latter algorithm is a revised version of the former. Computer simulations provided that the ANC systems developed here attained high rates of convergence, much reduction of noise level and high speeds of response, compared with a conventional ANC system with LMS (Least Mean Square) algorithms. Accordingly a main trouble of using RLS algorithms, that is, low speed of response was solved, and the algorithms could be then included in the ANC system for practical uses.View full abstractDownload PDF (937K) -
Kuniji MOTOHASHI, Hiroshi SHIMADA, Katsuyuki TANAKA, Tsuyoshi TAKANO1995 Volume 57 Issue 2 Pages 29-35
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe specific fifth and sixth wheels and the error revising program were made to detect the running trace of tractor. The test to prove the possibility of running trace detection by fifth wheels was conducted on slopeland and got sufficiently accurate results. This device may be applied to the detection of the trace with specific pattern such as surveying.View full abstractDownload PDF (818K) -
Design and evaluation of observer for articulated vehicleSatoshi OKE, Haruhiko MURASE, Yoshiaki NAKAMURA, Nobuo HONAMI1995 Volume 57 Issue 2 Pages 37-42
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis is the final report of this research. The design of the observer, by which other state valuables are estimated from the displacement of the vehicle in y-direction and its articulated angle, and the characteristics of observer were examined. It became clear that an output error was influenced by the weight of Riccati equation regarding the steering system of the articulated vehicle. It also became clear that the full order state observer can estimate state valuables properly with data obtained by the numerical experiment and the actual steering test. The problems which arise when the linear multi-valuable control theory was applied were taken into consideration. This research work has been finalized by the discussion of the possibility of the application of modern control theory to the control of the articulated vehicle with an example of a rice planter.View full abstractDownload PDF (731K) -
Hiroshi SHIMIZU, Minoru YAMAZAKI1995 Volume 57 Issue 2 Pages 43-50
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe effect of difference (DIF) between day temperature (DT) and night temperature (NT) and photoperiod on stem elongation of Verbena bonariensis L. plant was investigated. The combination of treatments was -10, 0 and +10 DIF and photoperiod of 8, 12 and 16 hours. Stem elongation was measured and analyzed with a non-contact method by a computer vision based system. Daily elongation markedly increased as DIF increased in all photoperiod treatments of 8, 12 and 16 hours. Longer photoperiod enhanced daily elongation at positive DIF (DT>NT) and zero DIF (DT=NT). DIF significantly affected elongation during the light period (EL) comparing to that during the dark period (ED). The magnitude of EL increased with increasing DIF and photoperiod.View full abstractDownload PDF (1090K) -
Katsumi ISHIKAWA, Yoshiichi OKADA, Hiroshi NAKAMURA1995 Volume 57 Issue 2 Pages 51-56
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe development of a new technology using very small energy of minerals is important from the point of view of constructing ecosystem agriculture etc. The physical and chemical properties of “Bakuhan-seki”, which belongs to puartzporphyry, were discussed expecting the effective introduction of “Bakuhan-seki” for the activation of water and soil in agriculture.View full abstractDownload PDF (5686K) -
Syntheses of Effective Manual and Semi-Automatic Shelling MethodsThavachai THIVAVARNVONGS, Tsuguo OKAMOTO, Osamu KITANI1995 Volume 57 Issue 2 Pages 57-65
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe physical properties of cashew nut were investigated and the mechanical properties relating to shelling were studied, which yielded results indicating that the hard structure of the nutshell normally required a force in the range of 50-70kgf to crack under ‘plane surface’ loading on a ‘raw’ nut, but if specific conditions were chosen such that ‘blade’ loading were applied to a ‘treated’ nut across its ‘width’ the cracking force was reduced to approximately 20kgf. A survey on the need of cashew nut famers and manufacturers for appropriate shelling machinery indicated definite needs for both the manually operated and power driven shellers. Design considerations on the manually operated sheller utilized the new principle of press-twist actions of the sheller's blade resulted in two versions of the manually operated sheller and one semi-sutomatic sheller.View full abstractDownload PDF (1039K) -
Masato SUZUKI, Ken KOBAYASHI, Koji INOOKU, Kyoshirou MIURA, Kozo HIRAT ...1995 Volume 57 Issue 2 Pages 67-76
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSWe carried out research on the development of a labor-saving system for grafting cucurbitaceous vegetables. Prior to the design of the system, we examined basic techniques such as grafting methods suitable for mechanization, seedling shape, location of cutting, seedling gripping, cutting, fixing tools, etc. Considering the rate of successful agglutination, the number of working processes, difficulties for mechanization etc., we examined various grafting methods and finally found that the “Cutting-off Cotyledon Grafting Method (CCG)” was the most suitable. The joint of cotyledons to the hypocotyl could be used as the standard for the location of cutting. High successful agglutination rate is obtained by reducing the grip compression strain of the hypocotyl below 30% of its diameter, cutting the seedling at the angle of 10 degrees for scions and 30 degrees for root stock, and using a manual grafting clip for fixing.View full abstractDownload PDF (8196K) -
Cultivation and Management DevicesOsamu SAKAUE1995 Volume 57 Issue 2 Pages 77-83
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to develop an automated seedling production system, robot and its devices were applied in greenhouse as previously reported. In this paper, automation of seedling cultivation and management operations is discussed. For irrigation, pest control and liquid fertilizing, the robot mounted boom nozzle moves slowly along the rails spraying mist over seedlings. Electrictimer or soil moisture sensor is used to decide the timing of spraying. For greenhouse temperature control, the curtains on both sides of the greenhouse go up and down in 4 steps, from close to full open, by a motor according to the signals of 3 thermo-contorollers attached to the robot. For CO2 spraying, in response to the timer signals in the early morning, electromagnetic valve is opened by the robot controller and CO2 gas flows out from the nozzle attached to the robot.View full abstractDownload PDF (5630K) -
Toshichika HIRUNAGI, Osamu KITANI, Tsuguo OKAMOTO, Toru TORII1995 Volume 57 Issue 2 Pages 85-92
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSFarm mechanization in Japan has remarkably developed in last decade. On the other hand, various accidents occurred in using farm machinery. Farm work safety in association with farm mechanization has become increasingly necessary in recent years. In this paper, an expert system to prevent accidents on farm was built for farm work safety. This system was developed by using backward reasoning of an expert shell. Before developing the system, farm work accidents were analyzed, and the results were utilized as a knowledge base of the expert system. This expert system was evaluated by farm machinery specialists and proved to be useful as an educational system for farm work safety.View full abstractDownload PDF (1174K) -
K. OHTSUBO1995 Volume 57 Issue 2 Pages 93-98
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (2587K)
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