All issues
Volume 66, Issue 4
Displaying 1-17 of 17 articles from this issue
- |<
- <
- 1
- >
- >|
-
R. TORISU2004 Volume 66 Issue 4 Pages 1-2
Published: July 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (2790K) -
Masayuki HIRAFUJI2004 Volume 66 Issue 4 Pages 4-9
Published: July 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (6946K) -
Seishi NINOMIYA2004 Volume 66 Issue 4 Pages 10-15
Published: July 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (7557K) -
Junichi SUGIYAMA2004 Volume 66 Issue 4 Pages 16-20
Published: July 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (8184K) -
Kazunari YOKOYAMA2004 Volume 66 Issue 4 Pages 21-25
Published: July 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (8956K) -
E. KINOSHITA2004 Volume 66 Issue 4 Pages 26-27
Published: July 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (4478K) -
H. KONYA2004 Volume 66 Issue 4 Pages 28-30
Published: July 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (4477K) -
Takashi OKAYASU, Koichi HASHIGUCHI, Toshiyuki OZAKI, Daiki YAJIMA, Shi ...2004 Volume 66 Issue 4 Pages 57-64
Published: July 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSTo design the bulk storage structures such as silo, hopper, etc., it is very important for us to grasp not only flow phenomena of powder and granular materials but also physical quantities acting on every part of the structure. In this article the finite element analysis program in which the subloading surface model falling within the framework of the unconventional plasticity was introduced, was applied for the analysis of the flow phenomena of wheat flour stored in the flat-bottomed silo. These results were compared with the flow phenomena and wall pressure distributions obtained by the discrete element simulation after Masson and Martinez (2000). The flow phenomena by two different methods almost agreed qualitatively. However the wall pressure distribution by FEM differs from one by DEM and its difference becomes large with the wall friction.View full abstractDownload PDF (3538K) -
Tuan Quoc NGUYEN, Kohei NAKANO, Shigenori MAEZAWA2004 Volume 66 Issue 4 Pages 65-71
Published: July 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSHot water treatment (HWT) at a range of temperatures from 35 to 65°C and of exposure times from 10s to 210min were applied to cherry tomato fruits (Lycopersicon esculentum cv. Coco) at turning stage. During storage at 20°C surface color was estimated by a/b ratio from CIELAB (L, a, b) color space coordinates and the delays in color developments of treated fruits were quantitatively expressed by a newly defined color-delay index. We were successful in determining the conditions of HWT where the color development was delayed without the occurrence of any damage. Those conditions ranged in restricted combination of temperature and exposure time and formed an effective HWT region. At red-ripe stage, sugar content and firmness of cherry tomato fruits treated in such effective HWT region were similar to those of control fruits. The determination of effective temperature and time conditions of HWT in the present study should be valuable in the application of HWT technique to quality management of fresh cherry tomato fruits.View full abstractDownload PDF (1081K) -
Carolina HACHE, Sakae SHIBUSAWA, Akira SASAO2004 Volume 66 Issue 4 Pages 72-80
Published: July 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSSoil, wheat growth and yield spatial variability were observed in an experimental field receiving three types of management. Wheat variability motivated to understand if it was caused by the experimental design or by soil variability. Furthermore, to determine soil parameters influencing yield Pearson correlation, multilinear regression and partial least square analyses were applied to several combinations of datasets. The statistical methods clearly identified positive and negative effects of electrical conductivity and high C/N, respectively. Best results were obtained with datasets created according to crop performance and not to field experimental design. Therefore, when testing management practices results should be observed by plot and by different areas within respective plots. Additionally, suggestions for management were accomplished.View full abstractDownload PDF (9019K) -
Ryutaro YAMADA, Akira YANO, Eiji TANIHIRA, Akio TAGAWA, Mituo IIMOTO2004 Volume 66 Issue 4 Pages 81-87
Published: July 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSCombined magnetic field (exposed) composed of extremely low frequency (ELF) magnetic field (50Hz, 112μT) and static magnetic field (127μT) or geomagnetic field (control) only was exposed to the carrot root tissue, and the effect of the growth it was examined. As result, on the average of both fresh weight and the water content of sample, was compared, exposed was significantly greater than control. On the other hand, the significant difference in dry weight between the exposed and the control was not found. In addition, though the exposed ion content in sample, such as K+ and Na+, was significantly greater than the control, the significant difference in ion content in sample, such as Mg2+ and Ca2+, between the exposed and the control was not found.View full abstractDownload PDF (1031K) -
Swapan Kumar ROY, Sakae SHIBUSAWA, Anuar Abdul RAHIM, Toshikazu KAHO2004 Volume 66 Issue 4 Pages 88-95
Published: July 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSSoil properties and yield were recorded in grid-spacing in a West Malaysia paddy field for the year 2000. Geostatistical analysis showed that soil properties and yield were notably correlated in space, and the range of spatially dependent yield was shorter than the soil properties. Co-kriging was used to estimate spatial pattern of yield with surrogate data (soil properties) was not successful for this field. The spatial yield map illustrated that the middle portion of the plot has lower yield (<3.5t/ha) compared to both ends in lengthwise. A management zone is suggested in the low yielding areas where soil N and soil P need to be improved for obtaining high yield (>5t/ha).View full abstractDownload PDF (6249K) -
Ripeness Determination by Label's Color as Accumulated TemperatureSadao OMORI, Osamu FUJIOKA, Tomohiro MIYAURA, Kyouich NOGUCHI2004 Volume 66 Issue 4 Pages 96-101
Published: July 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA pear (La-France) is a fruit difficult to judge from its outward appearance when it is just right to eat. We developed “a judgment label to evaluate being just right for eating of fruit in simpleness and easiness ready to be eaten”. The label was made possible to judge the degree of ripeness (the firmness of the pear) by using a label which changes its color as the accumulated temperature increases. In addition, ethylene gas, carbon dioxide, humidity were not influenced for the label. We have to lower a price of the label to practical use.View full abstractDownload PDF (7694K) -
Outline of the Developed Tiller and Work EfficiencyTakashi GOTOH, Mitsuhiro HORIO, Tomohiko ICHIKAWA, Tomoo KOBAYASHI, Yu ...2004 Volume 66 Issue 4 Pages 102-110
Published: July 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSBased on the results of fundamental studies, we manufactured prototypes of the high-speed rotary tillers. The prototype tiller had the following features. (1) The radius of curvature and the cutting angle of the curved portion of the rotary blade were increased. (2) The lateral mounting intervals of rotary blades were increased. (3) The rear space in the cover was expanded, the rear cover was rollable, and a rake was attached to its tip. (4) Shanks were installed in front of the rotary. Tests on three paddy fields revealed that the developed tiller could work one step faster in forward speed than the conventional tiller. Therefore, work efficiency of the developed tiller was 20 to 30% higher than the conventional tiller and the specific fuel consumption of the developed tiller was 10 to 20% less than the conventional tiller.View full abstractDownload PDF (5084K) -
Performance of the Medium-sized Rotary TillerTakashi GOTOH, Mitsuhiro HORIO, Tomohiko ICHIKAWA, Tomoo KOBAYASHI, Yu ...2004 Volume 66 Issue 4 Pages 111-120
Published: July 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSWe employed a prototype of the medium-sized high-speed rotary tiller and investigated the power requirements, working accuracy, etc. in one to seven paddy fields in comparison with a conventional rotary tiller that performs one cutting per rotation. Because the conventional tiller had a problem in leveling of the sole pan and soil pulverizing performance due to the too long tilling pitch during high-speed work, tests were done by increasing the PTO speed stage of the conventional tiller by one to two steps as compared with the developed tiller. As a result, the following were found. (1) The maximum forward speed of the developed tiller was 40% higher than that of the conventional tiller. (2) The developed tiller had the PTO specific power that was 5 to 10% lower and the specific thrust force that was 35 to 55% lower than those of the conventional tiller. (3) The conventional tiller caused excessive soil pulverization when operated at a high rotating speed on a medium- or coarse-textured field, but this was improved by the developed tiller. (4) The soil turning and leveling performance at high-speed work of the developed tiller were good and almost the same level as the conventional tiller that worked one step slower in forward speed.View full abstractDownload PDF (1554K) -
Performance of the Large-sized Rotary TillerTakashi GOTOH, Mitsuhiro HORIO, Tomohiko ICHIKAWA, Tomoo KOBAYASHI, Yu ...2004 Volume 66 Issue 4 Pages 121-131
Published: July 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA prototype of the large-sized high-speed rotary tiller was employed to investigate power requirement, working accuracy, etc. in two to five paddy fields and compared with the results of a conventional rotary tiller that performs two cuts per rotation. As a result, the following were found. (1) The maximum forward speed of the developed tiller was 15 to 40% higher than that of the conventional tiller. (2) The developed tiller had the PTO specific power that was 10% lower, the specific thrust force that was 20 to 50% lower and the vibration level at the tractor seat that was 1 to 3dB lower than those of the conventional tiller. (3) The soil pulverizing performance of the developed tiller was on almost the same level as that of the conventional tiller on wet fine-textured paddy fields but was superior to that of the conventional tiller on other paddy fields. (4) The soil turning performance and leveling performance of the developed tiller were good and almost the same level as the conventional tiller that worked one step slower in forward speed.View full abstractDownload PDF (1555K) -
Yasuhiko SAWADA2004 Volume 66 Issue 4 Pages 132-139
Published: July 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSAn user-friendly program for backing up decision-making of capital investment in plant-and-equipment has been developed. It can be used easily and practically, because the reference value and the commentary are displayed at the time of data input. This program is applicable to construction of mechanization system and economical analysis of capital investment. As a result of exhibiting this program on the Internet and letting farmers use, it turns out that problem solution in the agricultural spot is useful.View full abstractDownload PDF (14000K)
- |<
- <
- 1
- >
- >|