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NUMERICAL ANALYSES OF FLOw FIELDS IN A VANED DIFFUSER wITH VARIOUS FLOw RATES

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NUMERICAL ANALYSES OF FLOW FIELDS IN A VANED DIFFUSER WITH V...

第一届亚洲制冷空调大会

作者： H.-S.kim D.-w.kim Youn J.kim School of Mechanical Engineering SungKyunKwan University 300 Cheoncheon-dong Suwon 400-746 Korea School of Mechanical Engineering SungKyunKwan University 300 Cheoncheon-dong Suwon 400-746 Korea School of Mechanical Engineering SungKyunKwan University 300 Cheoncheon-dong Suwon 400-746 Korea

＜正＞The optimal design of the elements, i.e., impeller, diffuser, and casing in a turbo-compressor is very important, because the dynamic energy developed by the impeller transformed into the pressure energy in the diffuser and casing. The performance characteristics of the diffuser are complicated with different geometric shapes. To improve the performance of the small-size turbo compressor with a high rotating speed, the effects of flow rates from 0.8 times design point to 1.2 times Qd are numerically studied. Also, the comparison of the performance of the vaneless and vaned diffusers carried out. A blade of an impeller has two-dimensional backswept shape to avoid the tip clearance effects. In order to predict the flow pattern inside the entire impeller, diffuser and casing, calculations with multiple frames of reference method between the rotating and stationery parts of the domain are carried out. All domains for analyses are discretized by bexahedral elements. Three-dimensional, unsteady, viscous governing equations are solved using FVM, SIMPLE algorithm, and κ-εturbulence model. The pressure recovery coefficient （Cp） and the loss coefficient （K） have been calculated to estimate the performance and loss of the diffuser. Furthermore, the magnitude of velocity and the distributions of static and total pressures are calculated along the length of the diffuser.

关键词： Turbo-compressor Vaned and vaneless diffusers Loss coefficient Pressure recovery coefficient

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摄食大豆蛋白降低猫血浆中牛磺酸

肉品卫生 1997年第4期 27-30页

作者： SEUNGwOOK w.kim 张牧

经大鼠实验,已知大豆蛋白可降低胆固醇和影响胆汁酸代谢,且猫食中蛋白质的数量和质量变化很大。基于这些原因,在本文中,将描述膳食大豆蛋白与酪蛋白、大豆纤维物质对猫的牛磺酸水平的影响。

关键词：大豆蛋白猫血浆牛磺酸

SERS AND SEHRS IN FRACTAL AND FRACTAL-MICROCAVITY COMPOSITES

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SERS AND SEHRS IN FRACTAL AND FRACTAL-MICROCAVITY COMPOSITES

The International Symposium on Progress in Suface Raman Spectroscopy--Theory, Techniques and Applications

作者： VladimirM.Shalaev w.kim V.P.Drachev V.Podolskiy V.P.Safonov R.L.Armstrong Department of Physics New Mexico State UniversityLas CrucesNM 88003 USA Department of Physics New Mexico State UniversityLas CrucesNM 88003 USA Department of Physics New Mexico State UniversityLas CrucesNM 88003 USA Department of Physics New Mexico State UniversityLas CrucesNM 88003 USA Department of Physics New Mexico State UniversityLas CrucesNM 88003 USA Department of Physics New Mexico State UniversityLas CrucesNM 88003 USA

＜正＞Fractal aggregates of metal nano-sized particles can provide dramatic enhancement for various linear and nonlinear optical responses, including Raman Scattering （RS） and Hyper-Raman Scattering （HRS）. This occurs because of localization of optical plasmon excitations within small parts of a fractal aggregate, "hot spots", much smaller than the size of the fractal and often much smaller than the wavelength. Fractals are scale-invariant and therefore, in contrast to translationally invariant media, do not support propagating waves. when sufficiently concentrated, the large electromagnetic fields in

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电共轭流体微型泵的实验研究(英文)

强激光与粒子束 2015年第2期27卷 151-154页

作者：王海波张如照邹海龙金俊完西南交通大学机械工程学院成都610031 东京工业大学精密工学研究所

为了解决MEMS技术制备具有超厚、高深宽比电极结构的射流发生器中三角柱电极尖端部分出现的弧形缺陷以及脱模时缝隙电极易脱落等问题,提高射流发生器的制作质量以及电共轭流体微型泵的输出性能。结合理论分析与反复试验提出了一系列改... 详细信息

为了解决MEMS技术制备具有超厚、高深宽比电极结构的射流发生器中三角柱电极尖端部分出现的弧形缺陷以及脱模时缝隙电极易脱落等问题,提高射流发生器的制作质量以及电共轭流体微型泵的输出性能。结合理论分析与反复试验提出了一系列改进措施:优化涂胶、热处理、显影等工艺的参数以及缝隙电极的形状,采用新型KMPR光刻胶去除方法等。通过应用上述方法获得的射流发生器中,三角柱电极-缝隙电极对厚度约500μm,深宽比高,三角柱电极尖端结构完整,缝隙电极附着率有很大提高。同时,利用制备的射流发生器,设计、装配了电共轭流体微型泵的样机。

关键词：微型泵 MEMS 电共轭流体三角柱-缝隙电极对

χ-分离成像诊断多发性硬化与视神经脊髓炎谱系病

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国际医学放射学杂志 2023年第3期 359-360页

作者： w.kim H.Shin H.Lee D.Park J.Kang Y.Nam 王超

摘要使用χ分离成像可以提供与多发性硬化（MS）病变异常变化密切相关的铁和髓鞘检测的一种补充手段。目的评估MS和视神经脊髓炎谱系病（NMOSD）脑病变在χ-分

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小麦叶内锈菌细胞核荧光染色方法

西北农业大学学报 1991年第S1期19卷 54-57页

作者：康振生李振岐商鸿生 J.Chong R.Rohringer w.kim 西北农业大学植保系加拿大农部温尼泊研究所

本文对小麦叶内锈菌菌丝细胞核的荧光染色方法进行了研究。受锈菌侵染的小麦叶片经0.25％纤维素酶和0.12％Driselase混合液培养2～3h,锈菌菌落从组织中游离出。菌落经荧光染料DAPI(5μg/mL)和Calcoflour white(0.001％)分别染色1～3min... 详细信息

本文对小麦叶内锈菌菌丝细胞核的荧光染色方法进行了研究。受锈菌侵染的小麦叶片经0.25％纤维素酶和0.12％Driselase混合液培养2～3h,锈菌菌落从组织中游离出。菌落经荧光染料DAPI(5μg/mL)和Calcoflour white(0.001％)分别染色1～3min后,菌丝的细胞核、壁、隔膜在荧光显微镜下易于观察辩认。

关键词：小麦叶片锈菌细胞核荧光染色

计算机辅助诊断在肺癌CT筛查中Lung-RADS分类的应用：对阅片者间一致性的影响

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国际医学放射学杂志 2022年第2期 245-246页

作者： S.Park H.Park S.M.Lee Y.Ahn w.kim K.Jung 刘昶

摘要目的评估计算机辅助诊断（CAD）在肺部影像报告与数据系统（Lung-RADS）分类中对阅片者之间一致性的影响。方法从国家肺癌筛查试验中随机抽取了200例涵盖

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胸部CT肺亚实性结节的计算机辅助检测：基于深度学习减少CT扫描层厚可提高检出率

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国际医学放射学杂志 2021年第3期44卷 361-362页

作者： S.Park S.M.Lee w.kim H.Park K.H.Jung K.H.Do 俞翔

摘要目前尚缺乏关于计算机辅助检测(CAD)肺亚实性结节(SSN)的最优化的CT层厚的研究。目的在对亚实性结节的检测中,评估CT扫描层厚对CAD效率的影响,并探讨

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Superplasticity of fine-grained Mg-10Li alloy prepared by severe plastic deformation and understanding its deformation mechanisms

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Journal of Magnesium and Alloys 2024年第1期12卷 316-331页

作者： H.T.Jeong S.w.Lee w.J.kim Department of Materials Science and Engineering Hongik UniversityMapo-guSangsu-dong 72-1Seoul 121-791Republic of Korea

The superplastic behavior and associated deformation mechanisms of a fine-grained Mg-10.1 Li-0.8Al-0.6Zn alloy(LAZ1011)with a grain size of 3.2μm,primarily composed of the BCCβphase and a small amount of the HCPαphase,were examined in a temperature range of 473 K to 623 *** microstructural refinement of this alloy was achieved by employing high-ratio differential speed *** best superplasticity was achieved at 523 K and at strain rates of 10^(-4)-5×10^(-4)s^(-1),where tensile elongations of 550±600%were *** the heating and holding stage of the tensile samples prior to tensile loading,a significant increase in grain size was observed at temperatures above 573 ***,it was important to consider this effect when analyzing and understanding the superplastic deformation behavior and *** the investigated strain rate range,the superplastic flow at low strain rates was governed by lattice diffusion-controlled grain boundary sliding,while at high strain rates,lattice diffusion-controlled dislocation climb creep was the rate-controlling deformation *** was concluded that solute drag creep is unlikely to *** the late stages of deformation at 523 K,it was observed that grain boundary sliding led to the agglomeration of theαphase,resulting in significant strain *** mechanism maps were constructed forβ-Mg-Li alloys in the form of 2D and 3D formats as a function of strain rate,stress,temperature,and grain size,using the constitutive equations for various deformation mechanisms derived based on the data of the current tests.

关键词： Magnesium-lithium alloy Superplasticity Severe plastic deformation Grain size Grain growth