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Volume 25 (1994 - 199･･･
- Issue 4 Pages 175-
- Issue 3 Pages 125-
- Issue 2 Pages 59-
- Issue 1 Pages 3-
Volume 25, Issue 2
Displaying 1-5 of 5 articles from this issue
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Atsuo IKEGUCHI1994 Volume 25 Issue 2 Pages 59-69
Published: September 25, 1994
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSScale model experiments were performed under winter ventilation to evaluate difference in distribution properties of carbon dioxide caused by difference in ventilation method such as 1) ventilation rate, 2) incoming jet direction and 3) temperature difference between the inlet vent and the representative point in a room. The target livestock house was an enclosed swine farrowing house with slotted inlets and dampers on the side walls. Three ventilation efficiencies were selected as evaluation parameters. The first one was space averaged value of concentration of contaminant (SAVC) which refers to exhausting efficiency. The second one was average diffusion radius of contaminant dispersion (ADRCD) which evaluates the diffusion of contaminant. The third one was dimensionless concentration (DC) which is quantity related to local exchange rate of air. The results indicate that ventilation rate had a significant (1%) effect on SAVC. The tendency of the gas to sediment on the floor was also observed, and a linear correlation between Re (Reynolds number) at inlet vent and SAVC was also shown. Since the sedimented carbon dioxide on the floor diffused again by entrainment as the momentum of airflow increased, SAVC increased in a target ventilation space (The height was from 0.36m above floor to ceiling.) as Re increased according to the range of the present ventilation rates. Experimental factors were not found to have an effect on ADRCD which was on the average, 4.431m. It was concluded that airflow pattern affected distribution of local ventilation efficiency as the incoming jet direction significantly (5%) influenced the variation of DC. The variation was larger than that in other incoming jet directions when it was 148° upward.View full abstractDownload PDF (1159K) -
Operations of Removal of Manure and Physiological LoadTadakatsu AONO, Takashi TSURUSAKI, Noriyuki WATANABE1994 Volume 25 Issue 2 Pages 71-78
Published: September 25, 1994
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSIn a poultry house, many sorts of harmful gases are generated by chemical responses of the manure accumulated. The generation of harmful gases is the most serious problem in a poultry house. The development of more efficient machine for the manure removal is severely required. In the previous paper (Aono et al., 1994), we made a new machine for the manure removal on an experimental basis, which provides automatic running device and is used in a open and high floor type poultry house, and then examined its traction ability and efficiency of the manure removal.
In this paper, for further investigation of the machine performance, the physiological stress when the worker receives while operating the new manure removing machine was examined by measuring the working time and the number of hert beat of the operator. The working ability in the new machine is 1.4 fold higher than that in a conventional machine. The monitoring of the number of hert beat allowed to exactly distinguish several working processes, such as rest, work and restoration. The incremental index of the number of hert beat of the operator varied with the degree of the biological stress, and it is lower in the use of new machine than in the use of a conventional machine.View full abstractDownload PDF (2237K) -
Kazutaka UMETSU, Hidehiko TAKAHATA, Hideo HOSHIBA, Tetsuya SATO1994 Volume 25 Issue 2 Pages 79-84
Published: September 25, 1994
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSA laboratory study was conducted to investigate the important kinetic parameters in the design and operation of mesophilic digestion systems of dairy manure slurry. The experimental design was set up to test the effects of feed concentration (So=70.9, 85.1, 106.4kg-VS/m3) and retention time on the kinetic parameter K as presented in the Chen-Hashimoto model. The value of K increased exponentially with increase of So, and was expressed as:
K=0.614exp0.021·So.
The model was adequate to predict the methane production rate. The mean ratio of predicted volumetric methane production rate (υv) to experimental υv was 0.99 with a standard deviation of 0.11.View full abstractDownload PDF (583K) -
Analysis of Operating Characteristics with Receiving FactorsKiyokazu GOTO, Yoshihiro MIWA, Toshimitsu HATTORI1994 Volume 25 Issue 2 Pages 85-92
Published: September 25, 1994
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThe receiving section of grain drying facility is the important one because the weight and moisture content of paddy brought by each farmer are measured. The capacity of each machine is usually decided as the operating rate of weighing device is 70%, however it's dificult to get the expected performance. So, in order to consider the effects of some receiving factors on the receiving characteristics, the equations of operating rate were established. Considering also the method raising operating rate in which two or three weighing buffer tanks are settled, the fundamental data for optimum receiving system was obtained. It was then clarified that the effects of average weight per one lot and capacity of separator on the receiving characteristics are significant. Because the operating states are much different according to the number of weighing buffer tank, it is necessary to investigate the optimum receiving system also from the viewpoint of total cost.View full abstractDownload PDF (910K) -
Naoki SAKAI, Satoshi YONEKAWA, Akio MATSUZAKI, Hiroshi MORISHIMA1994 Volume 25 Issue 2 Pages 93-99
Published: September 25, 1994
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSWe practiced two-dimensional image analysis of brownrice and milled rice of the two well-known varieties, Koshihikari and Nipponbare, in Japan. Especially we investigated both effects of annual variation during 16 production years and regional variation among several production places on the basic descriptors of shape of rice. In the same variety, the maximum variation were about 7% among years and places, respectively, shown by the CV (Coefficient of variation).
Next we tried a new method to separate the mixture composed of two similar varieties of brown rice and milled rice into the two original varieties with some regional variation. This proposed method was simple, and the separated result was generally satisfied in recovery rate of the product and Newton efficiency when it was applied to the mixture of Koshihikari and Nipponbare.View full abstractDownload PDF (844K)
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