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Volume 19 (1988 - 198･･･
- Issue 3 Pages 147-
- Issue 2 Pages 67-
- Issue 1 Pages 5-
Volume 19, Issue 2
Displaying 1-6 of 6 articles from this issue
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The Effect of Hair on the Mass Transfer Coefficient of Sweat on the Body Surface of LivestockHirofumi KAWANISHI, Morimasa NAGASHIMA, Hideaki MATSUO, Norihiko MIYAN ...1988 Volume 19 Issue 2 Pages 67-74
Published: November 15, 1988
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThe length, diameter and density of cow's hair and pig's bristle was determined using cow's hide and swine's skin.
Following analysis of variance, the average value for each of these parameters was calculated and compared. The effect of hair on the mass transfer coefficient of water at the body surface was examined.
The following were obtained:
1) The maximum density of bristle on the swine's skin used for the determination was only 0.231 hairs/mm2, thus we concluded that swine's bristle has hardly any effect on the transfer coefficient of water at the body surface.
2) The cow's hair affected the mass transfer coefficient of sweat at the body surface, but it was only slightly influenced by hair characteristics (length, diameter and density) and hair direction with respect to the air stream.
3) The influence coefficient of hair is above 1.0 when the Reynolds number is within 5000, but it was lower when this number was larger. It remained at about 0.6 when the number was above 30000.View full abstractDownload PDF (944K) -
Kinetic Analysis of Walking Behavior of Cows in Two Different Floor ConditionsYoshikazu SATO, Yoshitomi TSUTSUI, Noriaki YAMAGISHI, Ryohei FURUKAWA1988 Volume 19 Issue 2 Pages 75-79
Published: November 15, 1988
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSA kinetic analysis of the walking behavior of cows was made to obtain basic data for improving floor design in cattle barns. Locomotor patterns of cows, and three components of the forces applied by cow's feet, were studied on bared concrete and chaff covered concrete floors. The thickness of the chaff was 7 to 9cm. The displacement of the cow's center of gravity was estimated based on the total force applied by four feet.
The obtained results are summarized below:
1. The phase lag of stance phases and swing phases, and the basic patterns of the curves of the three force components applied by a cow's foot were almost the same in the two floor conditions.
2. There was an impulse at the contact of the foot to the floor on the bared concrete, while almost no impulse was measured on the chaff covered concrete.
3. The displacement of the cow's center of gravity in the vertical direction ranged from 1 to 3cm for both floor conditions. In the horizontal perpendicular direction, the amplitude was larger than that in the vertical direction. The amplitude ranged from 11 to 14cm on the bared concrete floor, and from 6 to 10cm on the chaff covered concrete floor. The difference seems to be because the horizontal perpendicular force on the bared concrete floor was slightly larger than that on the chaff covered concrete floor.View full abstractDownload PDF (570K) -
Makoto NARA, Mitsuyoshi MORINAGA, Kazuhiko ABE, Toshiro OSHIKATA, Tosh ...1988 Volume 19 Issue 2 Pages 81-97
Published: November 15, 1988
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSA newly designed experimental solar greenhouse (200m2) was constructed in the farming cooperative of Higashikawa, Kamikawa District, Hokkaido In May, 1985. A new material (Light Transmissive and Thermally Insulated Walls) has been employed in the wall covering which is superior for insulating and retaining heat in winter, and reflecting heat in summer for the solar greenhouse. The test house structure was assembled entirely by fitting the new wall material to a pipehouse-type framework.
The solar system consists of a heat absorbing device, and an underground heat converter, as well as, a floor warming-cooling panel. Both the heat absorbing device and the floor warming-cooling panel are made of synthetic rubber. The underground heat converter consists of parallel warm water pipes which have been laid underground. The cultivation combines a watering system with the bed of inorganic fibers.
The solar greenhouse includes such special features as the ability to operate year-round, onservation of labor, and cleanliness, not to mention energy conservation year-round. Results from research carried out over a two year period confirm the energy conserving features of this system and verify the future possibility of harvesting fruits and vegetables, for example, melons, more than three times a year.View full abstractDownload PDF (5191K) -
Meizen AOKI, Tomohiro TAKIGAWA, Shigeru YOSIZAKI1988 Volume 19 Issue 2 Pages 99-106
Published: November 15, 1988
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSIn order to investigate the explosibility of rice bran which produces in rice milling process, the maximum explosion pressure and the maximum rate of pressure rise were measured by utilizing Hartman aparatus. The main results obtained were the following:
(1) The maximum explosion pressure and the maximum rate of pressure rise decreased as the moisture content of rice bran increased.
(2) The flame propagation time increased as the moisture content and the particle diameter increased.
(3) The burning velocity was determined based on the flame propagation time and substituted in the theoretical equation. The results coincided with the experimental results which were obtained from the 1m3 vessel. Thus, it seems that using cylindarical Hartman aparatus obtains useful data for plant design.
(4) The absolute explosion severity of the rice bran was the least when it is compared with lycopodium, potato starch, coal, rice husk and wheat. Kst value of rice bran was small, and the second in value next to potato starch. Hence, the explosibility of rice bran seems to be not so large.View full abstractDownload PDF (793K) -
Effects of Structure of Manure Gutter on Udder Preparation Time and Cleanliness of UdderDenzo SAHARA, Yoshiyasu AIHARA, Tadao ICHIKAWA, Hirofumi KAWANISHI, Mo ...1988 Volume 19 Issue 2 Pages 107-112
Published: November 15, 1988
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThree typical types of barn gutter were chosen to clarify the effects of the structure of the gutters on cleanliness of udders and time required for manure handling and udder preparation of dairy cows. Three types of barn gutter were installed to stanchion stalls successively on an experimental basis.
The three types were; urine-feces mixed type gutter with no cover (A), urine-feces mixed type gutter with steel slotted cover (B) and urine-feces separated type gutter with wood strip cover (C).
Three milking cows (Holstein) were confined in the stanchion stalls installed with one of those three type gutters during 96 hours, and milking and the other routine were conducted by the same workers.
It was found that type B was most reasonable construction compared with the other two types, because cows confined in the stalls with gutter of type B required less time for manure handling and udder preparation, and degree in contamination of udder washed water and dry matter content of dirt come from the udder were less than those of cows confined in the other two types of gutter.View full abstractDownload PDF (789K) -
On the Environmental Characteristics of Rice Drying and Processing FacilitiesTomoyuki SENO1988 Volume 19 Issue 2 Pages 113-116
Published: November 15, 1988
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThe author discussed on the concentration of airborne dust and airborne common (viable) bacteria in dairy barns in the previous paper. The present paper is concerned with the same purpose, but on the environment of the rice drying and processing facilities.
It was considered that the concentration of airborne microbes would be proportional to the 2/3th power of the concentration of airborne dust. As a result of measured data, it was proved near correlation between these concentration value.
The number of the microbes which attached to respirable dust was estimated as 4.5×104-4.5×106CFP/mg.View full abstractDownload PDF (525K)
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