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Volume 49, Issue 3
Displaying 1-20 of 20 articles from this issue
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Satoru NAMBU1987 Volume 49 Issue 3 Pages 165-166
Published: 1987
Released on J-STAGE: April 30, 2010
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1987 Volume 49 Issue 3 Pages 167
Published: 1987
Released on J-STAGE: April 30, 2010
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1987 Volume 49 Issue 3 Pages 168
Published: 1987
Released on J-STAGE: April 30, 2010
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Deposit Characteristics on the Lattice TargetMasaki MATSUO, Toshitaka UCHINO, Mitsuo IIMOTO1987 Volume 49 Issue 3 Pages 169-176
Published: 1987
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA twin-fluid nozzle using the ionized field charging method (React Gun) and a spinning disk nozzle using the direct charging method (Mini Bell) were tested to spray to the target constructed with five layers of lattice.
Spray patterns of the twin-fluid nozzle were very narrow and its spray droplets had large penetration characteristic so that they reached to the fifth lattice of the target regardless of charged voltage.
When a needle electrode was maintained at a high voltage, many spray droplets deposited on back surface of the target.
Since there was little change of deposit efficiency at over-26kV voltage, the twin-fluid nozzle would be desired to use under relatively low voltage.
Deposit area of the disk nozzle was wide and deposit density on back surface of the target was very high, however, spray penetration was such little as the droplets scarecely reached until the third lattice with high shaping air flow rate of 245l/min.View full abstractDownload PDF (1239K) -
Jinzo NAGAHIRO, Ken HIGUCHI1987 Volume 49 Issue 3 Pages 177-187
Published: 1987
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe purpose of this study is to investigate the availability of the compressed rice-husk as (1) heat-energy resources and (2) raw material for manufacturing silicon-materials such as SiC of ceramics and a semiconductor. This report discusses the comparison test using two types of small generators. They equip with the different driving mechanisms of a plunger for the compression of biomass, and continuously produce the high calorie bio-gas over 12.5MJ{3000kcal}/m3 and the high quality charcoal by pyrolyzing the compressed biomass indirectly. The results are: (1) The power required for compression and driving is almost the same between the two types. (2) The compressed biomass feeder must be designed to reduce its idling power to the utmost because the idling power is much larger than the compressing one on either type.View full abstractDownload PDF (5887K) -
Power Transmission Efficiency of A Closed-loop System on Power TillersJun SAKAI, Cheng ZOU1987 Volume 49 Issue 3 Pages 189-195
Published: 1987
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSTheoretical analyses and field experiments of a rotary power tiller were carried out in order to study the power transmission characteristics of the tractor-rotary tilling system.
In this report, the feedback power of a power tiller caused by rotary tilling process is analyzed with block diagrams in order to obtain the theoretical equations of the power transmission efficiency in a closed-loop system. When a power tiller is tilling, a part of the rotary axle power transmitted from the engine returns back to the driving wheels of the power tiller, which is named “return power”. Then, a part of the return power is consumed by the traveling resistances of the machine. The surplus of the power is transmitted as feedback power into the power transmission system of the machine. Some equations to calculate the power transmission efficiency of the closed-loop system are obtained and discussed with actual exampes. The results of the field experiments will be reported in the next report.View full abstractDownload PDF (1008K) -
Effect of primary drying conditions on tea dryingHitoshi YOSHITOMI, Fujio NAKANO, Hiroshi TAKIYA, Katsuhiro SUZUKI1987 Volume 49 Issue 3 Pages 197-206
Published: 1987
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to clarify the factors which effect on the drying of tea leaves in primary drying process, some experiments were made under various conditions. Through the experiments, it was clear that the drying rate depended upon temperature, humidity, air-tea ratio, the revolution number of main shaft and the physical properties of tea material. The drying model of tea leaves which is based on the theory about constant rate drying in consideration of these experimental results well expressed the actual phenomena. Moreover we discussed about the primary drying tea roller with circulating path of exhaust air for controlling the drying state and improvement of thermal efficiency.View full abstractDownload PDF (1504K) -
Separating Characteristics of Rough Rice and Brown Rice by Indented Cylinder SeparatorHao NGUYEN, Kiyokazu GOTO, Ritsuya YAMASHITA1987 Volume 49 Issue 3 Pages 207-216
Published: 1987
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe indented cylinder separators have been used to separate whole rice grain and broken rice grain in practice, recently this separator is equipped in the rice husker to separate rough rice and brown rice. The separating theory of the indented cylinder separator was reported in Part 1 and Part 2. In this study, the recovery characteristics of rough rice and brown rice tested with various combinations of kind of indent and variety of grain were observed. From the experimental results, a method of determination of optimum utilizing conditions of the separator is discussed. An example of this method was presented.View full abstractDownload PDF (1452K) -
A Powered Rotary Subsoiler with Pressurized Sewage Sludge InjectionKen ARAYA, Eiichi ISHITANI, Satoshi TSUNEMATSU, Li WU, Chengiun GUAN1987 Volume 49 Issue 3 Pages 217-224
Published: 1987
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA powered rotary subsoiler is favored by the following aspects; (1) power can be directly transmitted more efficiently than through drawbar pull; (2) elimination of the draft of tillage tools reduces the need for heavily weighted wheels, thereby reducing soil compaction; and (3) elimination of draft allows tillage to be perfomed in difficult traction conditions.
The research reported in this paper was conducted to reduce the power requirements of this system by introducing fluid under pressure from the tip of the rotary subsoiler. The fluid injected is sewage sludge.
In conclusion, the power requirements of this system could be reduced by half of the power required for a conventional type at a high velocity ratio by injecting pressuryzed sewage sludge. The power required for injecting sewage when the subsoiler was rotated forward (down-cutting), was less than that required when the subsoiler was rotated reversely (up-cutting).View full abstractDownload PDF (7278K) -
Circulating Drying Model with Drying HouseKazuo HORIBE, Seiichi OHSHITA, Kenji NAKAGAWA1987 Volume 49 Issue 3 Pages 225-234
Published: 1987
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA mathematical model was presented to simulate the drying process of the solar drying system which comprises a drying house and a circulating dryer. A heat collection model, which forms a part of the above-mentioned mathematical model, corresponds to the drying house in which a black vinyl sheet was spread to improve the solar collection capacity.
The temperatures of a drying house wall, a black vinyl sheet, soil and inside air were predicted with the model and those values were qualitatively in accordance with the ones obtained from the experiments.
For the prediction of black vinyl sheet temperatures in particular, both the Finite Element Method and the Boundary Element Method were applied to a two dimensional and steady-state heat conduction problem. The results showed that the former is valid for materials which are in the very small ratio of thickness to width like a black vinyl sheet.
As to a cirulating drying model which is a modified deep bed drying model, the predicted values obtained under some assumptions agreed well to the experimental ones, which indicated the validity of the model.View full abstractDownload PDF (1380K) -
Koichi AKIMOTO1987 Volume 49 Issue 3 Pages 235-244
Published: 1987
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA basic examination to inspect fruits with non-destructive method by means of nuclear magnetic resonance (NMR) was carried out. The H2O and D2O solutions of pure substances such as sugars and acids were used, and effective peaks in the NMR spectra were selected for measuring contents of the substances. Measurements of sugars and acids contents in orange juice extracted were conducted, A nucleus used was H-1, and the apparatus of NMR was 90MHz (2.114T). Results obtained were as follows;
1. Values of chemical shift useful for quantitative analysis of each compound were as follows: saccharose; δ=5.33-5.38, glucose; δ=5.14-5.19, glucose; δ=3.39, citric acid; δ=3.14, malic acid; δ=2.84
2. A peak due to fructose overlapped ones due to other substances. Therefore, an equation for estimation fructose fraction was necessary to be made on the basis of equations to estimate saccharose and glucose, and then peaks due to the combination of these 2 sugars and fructose were developed, using the peaks of which the chemical shift were 3.67-3.90 (B1 peak), 5.33-5.38 (SA peak), and 3.39 (B3 peak), respectively.
3. Accuracy of the estimation with the sweep of 400Hz was improved more than that with the sweep of 800Hz.
4. A big side band was observed near the position of δ=4.7 of chemical shift in the case of solution containing H2O. It is necessary to change a rotaion rate of sample tube in order to avoid the overlap in this side band.
5. The NMR spectrum of orange juice was most similar to the spectrum of solution mixture of saccharose, fructose, glucose, and citric acid. Other substances is considered to be insensitive to the spectrum.
6. A linear reletionship was obtained between intensity of δ=3.14 peak and concentration of citric acid in fruit juice, and the correlation coefficient was 0.82. The correlation coefficient in the relation sugar (Brix) and estimated values by use of 3 peaks of δ=5.33-5.38, 3.67-3.90, 3.39 was 0.66.View full abstractDownload PDF (1503K) -
Haruo HORIHATA1987 Volume 49 Issue 3 Pages 245-250
Published: 1987
Released on J-STAGE: April 30, 2010
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Kiyoshi IIZUMI1987 Volume 49 Issue 3 Pages 251-257
Published: 1987
Released on J-STAGE: April 30, 2010
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Kiyoshi SODA1987 Volume 49 Issue 3 Pages 258-264
Published: 1987
Released on J-STAGE: April 30, 2010
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Akito YAMAMOTO1987 Volume 49 Issue 3 Pages 265-270
Published: 1987
Released on J-STAGE: April 30, 2010
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Tatsuo ARATA, Hiroshi KISHIDA1987 Volume 49 Issue 3 Pages 271-276
Published: 1987
Released on J-STAGE: April 30, 2010
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Hiromi YAMAGUCHI1987 Volume 49 Issue 3 Pages 277-281
Published: 1987
Released on J-STAGE: April 30, 2010
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Tomohiko ICHIKAWA, Takao SUGIYAMA1987 Volume 49 Issue 3 Pages 283-288
Published: 1987
Released on J-STAGE: April 30, 2010
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Tomohiko ICHIKAWA, Takao SUGIYAMA1987 Volume 49 Issue 3 Pages 289-294
Published: 1987
Released on J-STAGE: April 30, 2010
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Haruo ESAKI1987 Volume 49 Issue 3 Pages 295-300
Published: 1987
Released on J-STAGE: April 30, 2010
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