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熔接構造物 最適設計를 위한 Plug 熔接部의 疲勞壽命 評價에 關한 硏究
이중삼(Z.S.Li),서도원(D.W.Seo),윤호상(H.S.Yoon),임재규(J.K.Lim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
This study was intended to use for the fatigue test in real structures and offer basic data for optimum welding structure design through observing the effect of the size and distance of plug welding hole on the static strength and fatigue life of welding structer under the shear/bending load for the inprovement of fatigue life of plug welding joint between S/MBR and C/MBR in the lower structure of large bus.<br/>
고섬유질 곡류의 섭취가 육계의 성장능력 및 장관발달에 미치는 영향
임재삼(J . S . Lim),이봉덕(B . D . Lee),박창식(C . S . Park),정하연(H . Y . Jeong) 한국축산학회 1987 한국축산학회지 Vol.29 No.8
Two hundred and forty commercial female day-old broiler chicks were used to investigate the effects of high-fiber grains on the growth rate and various gut sizes. Four experimental diets were formulated to have similar energy and protein contents, with corn and sorghum as low-fiber grains, and rye and hulled barley as high-fiber grains. Birds were housed randomly in 20 wire-floor cages. There were 5 replicates per treatment and 12 chicks per replicate (pen). At 3 wk of age, rye-fed broiler chicks grew at significantly lower rate than did the other birds. At 6 wk of age, the growth rates of birds fed rye and sorghum were significantly lower than those of birds fed barley and corn. The feed efficiency of the rye treatment at 6 wk of age was significantly poorer than those of corn and barley treatments, and that of the sorghum treatment was intermediate. The fiber levels in grains did not exert any consistent effect on the weights of liver, gizzard and pancreas of broilers at 6 wk.of age. However, the intestines of birds fed high fiber grains tended to be heavier and longer than those fed low fiber grains, and this trend was especially noticeable in rye-fed birds. The microscopic observation of deal and colonic tissue slides from 3-and 6-wk-old broiler chicks revealed no difference in diameter, villi length, and in the thickness of muscularis mucosae, circular muscle layer and longitudinal muscle layer. However, the diameter of colon in 6-wk-old rye-fed birds was significantly larger than those fed the other grains.