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尹熙燮,金昌漢,張京鎭,尹汝昌,高泰松 건국대학교 1984 學術誌 Vol.28 No.2
In order to investigate the effect of Bacillus toyoi (Viable spore) on the growth of broilers, the utilizability of nutrients, stability of the bacteria in the diets, and the excretion of viable cells, a commercial diet (basal) added 0.02% (0.02 diet) and 0.10% (0.10 diet) of Toyocerin powder (contained Bacillus toyoi spore 109/g) in substitute for bacitracin of the basal diet were prepared. Day-old broiler chicks of White strain were fad with starters of basal, 0.02 and 0.10 diets for the four weeks and those of finishers far the next three weeks. During four weeks of starters feeding, the growth of chicks fad 0.02 diet and 0.10 diet were higher 1.4% and 1.1%, respectively, compared with those of basal diet. Feed conversions of chicks fed 0.02 and 0.10 diet showed 2.6 and 1.8% higher values than that of basal diet. But the effect of 0.02 an 0.10 diet feeding in chicks were not found during the finishers feeding. Nitrogen balance were 16-20 mg per gram of diets and protein retention were 53-63% of diets protein while experimental diets and starter and finisher feeding did not affect on the nitrogen balance and protein retention of the broilers. Nitrogen corrected metabolizable energy (MEn) were 3.273-3.287 kcal par gram of the starter diets and 3.358-3.394 kcal far the finisher diets, showing similar values among the experimental diets. And the metabolizability of starter diets were 74.5-74.8 % and those of finisher diets showed 77.3-78.5%, though significant differences were not found among the experimental diets. Also MEn value per gram protein consumed were 14.75-15.29 kcal while the values per protein retained in chicks showed 26.03-27.99 kcal. B. toyoi in starter feed and finisher feed of broiler which added 0.02 and 0.10% of Toyocerin powder was quite stable during storage at room temperature for 4 weeks. In viable cell counts in excretes, addition of 0.02 and 0.10% Toyocerin powder were almost similar to basal until the second weeks of feeding, but increased remarkably from the third weeks, and increased to 121 fold and 148 fold, respectively, than basal at the 7th weeks of feeding.
백원계(Won Kye Baek),이경철(Kyeong Chul Lee),김용현(Yong Hyun Kim),여재익(Jai-ick Yoh),신완순(Wan-Soon Sin),고광웅(Kwang-Uoong Koh),김현태(Hyun-Tae Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Physical phenomena occurred when high energy laser is irradiated on materials are very diverse according to power of irradiated energy, wave length, surface state of materials and so on. Especially in this experiments, metallic materials are the main materials on which high energy laser is irradiated. Experiments are divided into two. First, we irradiated continuous fiber laser(wave length is 1.07㎛) on metallic specimen of which size and thickness change according to power intensity. Second, we investigated the effect of water or other coating on specimens without change of size and thickness using CO₂ laser(wave length is 10.6㎛);power is fixed as 250W. In the first experiment, result showed typical heat transfer because irradiance(W/㎠) is lower than 10?W/㎠. The second experiment showed that damage is much more serious when material is coated.
Effect of Pressure on the Intermediate-valence Semiconductor SmB6 : 11B-NMR
Kohei Nishiyama,Takeshi Mito,Ko-ichi Ueda,Takehide Koyama,Takao Kohara,Gabriel Prist´aˇs,Slavom´ır Gab´ani,Mari´an Reiffers,Karol Flachbart,Yasuhiro Komaki,Mitsutane Kokubu,Hideto Fukazawa,and Yoh Koh 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We report the first high-pressure 11B-NMR studies above 3 GPa on the intermediate-valencesemiconductor SmB6. A 11B-NMR line obtained at 4.9 GPa, the highest pressure for the measurements,and at 1.9 K shows quite similar a line shape to that at ambient pressure, indicating nostructural or magnetic phase transition up to this pressure. The temperature dependence of thespin lattice relaxation rate 1/T1 at 4.9 GPa still exhibits an activation-type temperature dependencecharacteristic of semiconductors, which reveals an obvious decrease in the insulating gap byabout 30% compared to the gap at ambient pressure. The present experimental facts of a finiteinsulator gap and no magnetic order at 4.9 GPa are consistent with recent transport measurementsperformed under better hydrostatic pressures.