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Lyu, Seung Woo,Park, Young Min,Yang, Tae Young,Ryu, S.C.,Stevens, Ron,Park, Hong Chae Trans Tech Publications, Ltd. 2007 Key engineering materials Vol.336 No.-
<P>The dispersion and rheological behavior of aqueous alumina, zirconia, and mixed alumina/ zirconia slurries have been studied in terms of solid loading and the incorporated multiple processing additives. Darvan-C, Dynol 604, Glycerol, and PVA were used as the dispersant, surfactant, cryoprotectant, and binder, respectively. Sedimentation density increased significantly on adding the dispersant; its effectiveness was similar for both the alumina and zirconia suspensions. With further addition of binder, the sedimentation density decreased. The suspension viscosity generally behaved in an opposite manner to the sedimentation density, i.e., low sedimentation density gave high low-shear viscosity, indicative of high order structure formation in the suspended particles. Shear rate rheology of suspensions with high dispersant content showed a shear thinning but with low dispersant content (≤2 wt.%), however, it showed a shear thickening at high shear rate (>600 s-1).</P>
폴리이미드 / Clay 나노복합재료의 imidization 대한 연구
이영철,유성구,서길수,박대연 한국공업화학회 2000 응용화학 Vol.4 No.2
The reactive organoclay were prepared by intercalation of 4,4'-oxydianilline into sodium-montmorillonite. The dispersed organoclay in NMP was then added to the solution of synthesized polyamic acid. After imidization, exfoliated polyimide nanocomposite were prepared. The results of X-ray diffraction of polyimide nanocomposite showed that the peak of clay were disappered. From these results of TEM it was found that monolayer silicate were dispersed in polyimide matrix. The imidization temperature of polyimide nanocomposite were reduced dramatically.
조사료와 농후사료의 급여비율이 한우 거세우의 성장 및 도체특성에 미치는 영향
안병홍,송성철,류재숙 한국동물자원과학회 2002 한국축산학회지 Vol.44 No.6
한우 거세우에게 육성기, 비육전기와 비육후기별로 조사료의 급여수준을 달리하여(35∼11%, 44∼12%, 53∼13%) 비육하였을 때 이들 급여수준이 증체량 및 도체특성에 미치는 영향을 조사하여 농후사료와 조사료의 적정 급여수준을 규명하고저 본 시험을 수행하였다. 한우 거세우의 농후사료 섭취량은 체중 450㎏까지는 체중의 1.8%∼1.9% 수준까지 서서히 증가하다가 450㎏ 이후부터는 감소하였고 조사료 섭취량은 체중 300㎏까지는 체중의 1.04∼1.44% 수준까지 증가하다가 300㎏ 이후부터는 감소하였다. 근내지방도 및 육질등급은 육성기때 조사료 44% 급여구가 다른 급여구에 비하여 높게 나타는 경향이었고 등지방두께는 얇았다. 그러므로 한우 거세우 비육시 조사료 급여수준은 육성기때 44% 수준으로 급여하는 것이 35%나 53% 수준으로 급여하는 것보다 바람직하다고 사료된다. This experiment was carried out to investigate the effects of proportion of concentrates and roughages on growth and carcass traits of Hanwoo steers. Concentrates and roughages were allotted three levels of 35 to 11%, 44 TO 12% and 53 to 13%, respectively from the growing period to finishing period. Concentrate and roughage intake of Hanwoo steers were increased progressively until body weight reached 450㎏ and 300㎏, respectively and reached 1.8 to 1.9% and 1.04 to 1.44% to body weight, respectively but thereafter were decreased gradually. Marbling score and beef grade were tended to be increased when steers were fed 44% roughage compared with the steers fed 35% or 53% at the growing period. Therefore, it can be concluded that feeding 44% of roughage is desirable rather than feeding 35% or 53% of roughage when steers are fattening.