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Comparative Study on the Protease Inhibitors from Fish Eggs 被引量:8
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作者 Ustadi k.y.kim S.M.Kim 《Journal of Ocean University of China》 SCIE CAS 2005年第3期198-204,共7页
The protease inhibitor was purified from five different fish eggs. The molecular weights of Pacific herring, chum salmon, pond smelt, glassfish, and Alaska pollock egg protease inhibitors were 120, 89, 84.5, 17, and 1... The protease inhibitor was purified from five different fish eggs. The molecular weights of Pacific herring, chum salmon, pond smelt, glassfish, and Alaska pollock egg protease inhibitors were 120, 89, 84.5, 17, and 16.8kDa, respectively. The specific inhibitory activity of glassfish egg protease inhibitor was the highest followed by those of Pacific herring and Alaska pollock in order. The specific inhibitory activity and purity of glassfish egg protease inhibitor were 19.70 U mg^- 1 protein and 164.70 folds of purification, respectively. Glassfish egg protease inhibitor was reasonably stable at 50 - 65℃ and pH 8, which was more stable at high temperature and pH than protease inhibitors from the other fish species. Glassfish egg protease inhibitor was noncompetitive with inhibitor constant (Ki) of 4.44 nmol L^-1 展开更多
关键词 glassfish egg protease inhibitor STABILITY inhibitor constant
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Study of the Interface between Steel Insert and Aluminum Casting in EPC 被引量:3
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作者 K.H.Choe K.S.Park +6 位作者 B.H.Kang G.S.Cho k.y.kim K.W.Lee M.H.Kim A.Ikenaga S.Koroyasu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2008年第1期60-64,共5页
The effective surface treatment method for steel insert composited with Al base metal by expendable pattern casting (EPC) process and the bonding interface between steel insert and Al base metal were investigated.It... The effective surface treatment method for steel insert composited with Al base metal by expendable pattern casting (EPC) process and the bonding interface between steel insert and Al base metal were investigated.It was found that Zn plating on steel insert was effective on improving the bonding property between steel insert and Al base metal in EPC process.Zn is thought to promote the formation of diffusion layer.But almost none content of Zn was observed in the boundary which had been plated on the steel insert.A diffusion layer consisting of Al,Si and Fe was formed at the insert/alloy interface and its hardness was higher than the steel insert as matter of course Al base metal.This layer turned out to be intermetallic compounds of Al-Si-Fe system.Higher pouring temperature promoted the diffusion of Fe into Al alloy,so Fe content in intermetallic layers increased at higher pouring temperature.The layer nearest to steel disappeared due to applied pressure. 展开更多
关键词 Expendable pattern casting Insert casting Intermetallic compound Al-Si-Fesystem
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Influence of magnetic field and thermal radiation by natural convection past vertical cone subjected to variable surface heat flux 被引量:1
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作者 G.PALANI k.y.kim 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2012年第5期605-620,共16页
A numerical study is performed to examine the heat transfer characteristics of natural convection past a vertical cone under the combined effects of magnetic field and thermal radiation. The surface of the cone is sub... A numerical study is performed to examine the heat transfer characteristics of natural convection past a vertical cone under the combined effects of magnetic field and thermal radiation. The surface of the cone is subjected to a variable surface heat flux. The fluid considered is a gray, absorbing-emitting radiation but a non-scattering medium. With approximate transformations, the boundary layer equations governing the flow are reduced to non-dimensional equations valid in the free convection regime. The dimensionless governing equations are solved by an implicit finite difference method of Crank-Nicolson type which is fast convergent, accurate, and unconditionally stable. Numerical results are obtained and presented for velocity, temperature, local and average wall shear stress, and local and average Nusselt number in air and water. The present results axe compared with the previous published work and are found to be in excellent agreement. 展开更多
关键词 APEX MAGNETOHYDRODYNAMICS radiation finite difference skin friction vertical cone
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横向各向同性对含气砂岩P波AVO的影响 被引量:1
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作者 k.y.kim 孔祥宁 《石油物探译丛》 1993年第6期55-62,共8页
在分析页岩地层中含气砂岩夹层的振幅随偏移距变化(AVO)响应时,应考虑速度的各向异性。本文论述横向各向同性介质(TI)中含气砂岩 AVO 所受到的各向异性影响。应用基于射线理论的平面波公式计算出了横向均匀介质的反射系数。文中给出了... 在分析页岩地层中含气砂岩夹层的振幅随偏移距变化(AVO)响应时,应考虑速度的各向异性。本文论述横向各向同性介质(TI)中含气砂岩 AVO 所受到的各向异性影响。应用基于射线理论的平面波公式计算出了横向均匀介质的反射系数。文中给出了具有正反射系数,近零反射系数和负反射系数的勘探目的层特例的模拟结果。各向同性介质中的 AVO 反射系数可分解成两部分,分别代表各向同性和各向异性。对于各向同性分量,零偏移距反射系数与泊松比是最有效的参数;而对于各向异性分量,页岩和含气砂岩的δ差值(Aδ)是最重要的因子。在页岩地层具有典型 TI 各向异性值(δ和ε均为正值)的情况下,Aδ和Aε增强了 AVO 影响。在小入射角时,Aδ对 AVO 起主要控制作用,而大入射角时则是Aδ起主导作用。在δ和ε为典型值时,页岩的各向异性影响表现为:(1)对二、三类含气砂岩,AVO 响应增大较快;(2)对一类含气砂岩,AVO 响应呈迅速递减之势;(3)对某些一类和二类含气砂岩,在偏移距改变处将出现极性反转。 展开更多
关键词 AVO分析 气藏 地层 砂岩油气藏
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Photoluminescence enhancement of red-emitting GdVO_4:Eu and YVO_4:Eu phosphors by adding zinc 被引量:3
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作者 K.Park J.Kim +3 位作者 k.y.kim J.Y.Kim Y.Kim S.J.Dhoble 《Journal of Rare Earths》 SCIE EI CAS CSCD 2013年第1期13-17,共5页
We synthesized the rare-earth activated Ro.94_xEuo.06ZnxVO4 (R: Gd and Y; 0〈_x〈_0.08) phosphors with a spherical mor- phology and a smooth surface by the ultrasonic spray pyrolysis. The annealed Ro.94_xEuo.06ZnxV... We synthesized the rare-earth activated Ro.94_xEuo.06ZnxVO4 (R: Gd and Y; 0〈_x〈_0.08) phosphors with a spherical mor- phology and a smooth surface by the ultrasonic spray pyrolysis. The annealed Ro.94_xEuo.06ZnxVO4 crystallized in the tetragonal zircon type structure, belonging to the space group of I41/amd. The incorporation of a small amount of Zn to Ro.94Euo.06VO4 improved the emission characteristics. The emission intensities of the Gdo.88EUo.06Zno.06VO4 and Yo.9Euo.06Zno.04VO4 phosphors at 619 nm were 72% and 2 1% stronger than those of the Gdo,94Euo.06VO4 and Yo.94Euo.06VO4 phosphors, respectively. We demonstrated that the addi- tion of Zn to Ro.94Euo.06VO4 was quite effective for improving the photoluminescent properties. 展开更多
关键词 rare earths photolurninescence VANADATE ultrasonic spray pyrolysis
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