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MHD free convective flow past semi-infinite vertical permeable wall

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Applied Mathematics and Mechanics(English Edition) 2012年第9期33卷 1207-1222页

作者： R.k.SINGH A.k.SINGH Department of Mathematics Banaras Hindu University

In this paper, the basic equations governing the flow and heat transfer of an incompressible viscous and electrically conducting fluid past a semi-infinite vertical per- meable plate in the form of partial differential equations are reduced to a set of non-linear ordinary differential equations by applying a suitable similarity transformation. Approx- imate solutions of the transformed equations are obtained by employing the perturbation method for two cases, i.e., small and large values of the suction parameter. From the numerical evaluations of the solution, it can be seen that the velocity field at any point decreases as the values of the magnetic and suction parameters increase. The effect of the magnetic parameter is to increase the thermM boundary layer. It is also found that the velocity and temperature fields decrease with the increase in the sink parameter.

关键词： magnetohydrodynamics (MHD) suction source/sink Prandtl number permeability boundary layer

Precipitation analysis of as-cast Hk40 steel after isothermal aging

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International Journal of Minerals,Metallurgy and Materials 2017年第10期24卷 1125-1133页

作者： M.L. Saucedo-Munoz A. Ortiz-Mariscal V.M. Lopez-hirata J.D. Villegas-Cardenas Orlando Soriano-Vargas Erika O. Avila-Davila Instituto Politecnico Nacional (ESIQIE) Apdo. Postal 118-395 Mexico D.F. 07300 Universidad Politecnica Metepec y Tultitlan Edo. Mex. Mexico Tecnológico de Estudios Superiores de Jocotitlan Jocotitlan Edo. Mex. Mexico

As-cast Hk40 steel was aged at 700, 800, or 900℃ for times as long as 2000 h. Microstructural characterization showed that the primary M_7C_3 carbide network contained a substantial content of manganese, in agreement with the microsegregation of manganese calculated by Thermo-Calc using the Scheil–Gulliver module. The dissolution of primary carbides caused the solute supersaturation of austenite and subsequent precipitation of fine M_(23)C_6 carbides in the austenite matrix for aged specimens. During prolonged aging, the carbide size increased with increasing time because of the coarsening process. A time–temperature–precipitation diagram for M_(23)C_6 carbides was calculated using the Thermo-CalcPRISMA software; this diagram showed good agreement with the experimental growth kinetics of precipitation. The fine carbide precipitation caused an increase in hardness; however, the coarsening process of carbides promoted a decrease in hardness. Nanoindentation tests of the austenite matrix indicated an increase in ductility with increasing aging time.

关键词： as-cast Hk40 steel carbide precipitation aging precipitation simulation

小鼠膜联蛋白Ⅱ基因剔除重组子的构建及小鼠无膜联蛋白Ⅱ细胞系的建立(英文)

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细胞生物学杂志 2006年第5期28卷 721-725页

作者：侯颖春 Aiko hirata Fusao hirata 陕西师范大学生命科学学院 College of Pharmacy Sciences Wayne State UniversityDetroitMichigan 48201USA

为了便于对膜联蛋白II(annexinII)的进一步研究以及今后进一步发展膜联蛋白II-/-动物模型,构建了膜联蛋白II基因封闭重组子(pPNT/annexinII/LacZ),筛选了细胞(L5178Y)克隆,并获得了膜联蛋白II-/-稳定细胞克隆(D4,E2)。所获膜联蛋白II-/-... 详细信息

为了便于对膜联蛋白II(annexinII)的进一步研究以及今后进一步发展膜联蛋白II-/-动物模型,构建了膜联蛋白II基因封闭重组子(pPNT/annexinII/LacZ),筛选了细胞(L5178Y)克隆,并获得了膜联蛋白II-/-稳定细胞克隆(D4,E2)。所获膜联蛋白II-/-L5178Y克隆有待于以PCR做进一步鉴定。

关键词：膜联蛋白基因剔除细胞系

Development of Fine Poly(D,L-Lactic-Co-Glycolic Acid) Particles for Hydrophilic Drug Using a Solid-in-Oil-in-Water Emulsion

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Journal of Encapsulation and Adsorption Sciences 2018年第2期8卷 58-66页

作者： Eiichi Toorisaka kikumi Watanabe Makoto hirata Department of Environmental Science and Engineering Yamaguchi University Yamaguchi Japan Department of Applied Chemistry Oita University Oita Japan

Poly(D,L-Lactic-Co-Glycolic Acid) (PLGA) copolymers have been extensively used as controlled-release carriers for many hydrophilic drugs because they are non-toxic, biodegradable, bioavailable, and biocompatible. In general, PLGA particles have been produced by a solvent evaporation technique utilizing water-in-oil-in-water (W/O/W) emulsions. However, W/O/W emulsions are unstable, causing the outer and inner aqueous phases to easily fuse during particle preparation. Consequently, a sufficient amount of drug was not encapsulated inside the particles. In this study, we examined a new particle preparation method utilizing a solid-in-oil-in-water (S/O/W) emulsion technique. The advantages of S/O/W emulsions, wherein a surfactant-drug complex disperses into the oil phase, were as follows: 1) leakage of hydrophilic drugs from the emulsions was inhibited, and 2) facile control over the emulsion particle size. Thus, the PLGA particles prepared by this method showed high encapsulation efficiency of drugs and formation of fine particles of submicron size by membrane emulsification were achieved.

关键词： PLGA Hydrophilic drugs S/O/W Emulsions Solvent Evaporation

Propensity score analysis demonstrated the prognostic advantage of anatomical liver resection in hepatocellular carcinoma

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World Journal of Gastroenterology 2014年第12期20卷 3335-3342页

作者： Masayuki Ishii Toru Mizuguchi Masaki kawamoto Makoto Meguro Shigenori Ota Toshihiko Nishidate kenji Okita Yasutohsi kimura Thomas T Hui koichi hirata Department of Surgery Surgical Oncology and ScienceSapporo Medical University Hospital Sapporo Medical University Department of Surgery Children’s Hospital and Research Center Oakland

AIM: To compare the prognoses of hepatocellular carcinoma (HCC) patients that underwent anatomic liver resection (AR) or non-anatomic liver resection (NAR) using propensity score-matched populations.

关键词： Anatomical liver resection Propensity score analysis Hepatocellular carcinoma

功函促进钼基异质结电催化剂的电子结构重整提升其析氢反应活性（英文）

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Science China Materials 2025年第1期 189-198页

作者：陈想冯帅谢松苗亚萍高标张旭明黄莉李筠 Paul k.Chu 彭祥 Hubei key Laboratory of Plasma Chemistry and Advanced Materials Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education School of Materials Science and Engineering Wuhan Institute of Technology School of Textile Science and Engineering Xi'an Polytechnic University The State key Laboratory of Refractories and Metallurgy Institute of Advanced Materials and Nanotechnology Wuhan University of Science and Technology Guizhou Wujiang Hydropower Development Co. Ltd. Department of Physics Department of Materials Science and Engineering and Department of Biomedical Engineering City University of Hong Kong

Mo基催化剂在电催化析氢反应（HER）中具有巨大应用潜力.然而,其活性位点的暴露不足、极强的氢吸附能力导致其催化性能未能充分体现.本文在碳布上构筑了Mo2N–MoSe2异质结（MNS）,以增强Mo基催化剂的HER活性.由于MNS中的Mo2N具有较低的...

Mo基催化剂在电催化析氢反应（HER）中具有巨大应用潜力.然而,其活性位点的暴露不足、极强的氢吸附能力导致其催化性能未能充分体现.本文在碳布上构筑了Mo2N–MoSe2异质结（MNS）,以增强Mo基催化剂的HER活性.由于MNS中的Mo2N具有较低的功函数,能够在异质界面产生内建电场,显著提高了其在HER中电荷转移效率.此外,MNS中原子之间的强电子相互作用优化了Mo位点的电子结构,降低了氢吸附能力,进一步增强了其本征催化活性.因此, MNS催化剂产生20 m A cm-2和1 A cm-2的析氢电流密度所需的过电位仅为65和210 mV, Tafel斜率仅为96 mV dec-1.此外, MNS在1 A cm-2电流密度下稳定运行240小时后,形貌、结构和性能均无明显变化.以上研究结果为工业大电流制氢所需的非贵金属基电催化剂的设计和合成提供了新思路.

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Spontaneous emission in the ellipsoidal nanocrystals

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Journal of Rare Earths 2009年第4期27卷 637-640页

作者： k.k.Pukhov General Physics Institute Russian Academy of Sciences 38 Vavilov Str.Bld.D Moscow 119991 Russia

The equation was presented for the spontaneous emission rate Anano of the two-level optical centers in the subwavelength eilipsoi- dal nanocrystals embedded in a dielectric medium. An important result was that the ratio Anano/Abulk could be estimated without recourse to a particular local-field model. On the ground of this equation the expression was derived for linestrength of electric-dipole transition in trivalent rare-earth ions. The applicability of the Judd-Ofelt equation for nanoparticles was discussed.

关键词： spontaneous emission lifetime nanocrystals Judd-Ofelt parameters rare earths

Customization of Wavelet Function for Pupil Fluctuation Analysis to Evaluate Levels of Sleepiness

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通讯和计算机（中英文版） 2013年第5期10卷 585-592页

作者： Ruben-Dario Pinzon-Morales Yutaka hirata Department of Computer Science Chubu University Kasugai 1200 Japan

Preparation of Sm2O3 and Co3O4 from SmCo magnet swarf by hydrometallurgical processing in chloride media

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Journal of Rare Earths 2018年第7期36卷 725-732页

作者： k.Sahoo A.k.Nayak M.k.Ghosh k.Sarangi CSIR-Institute of Minerals and Materials Technology Bhubaneswar-751013OdishaIndia

The recycling of rare earth elements（REE） from end-of-life REE based products is an environment friendly proposition. Waste Sm-Co based permanent magnet generated during machining is a good source for both Sm and Co. In the present study a simpler process of acid leaching at 80 ℃ followed by solvent extraction, oxalate precipitation and calcination is described for producing pure Sm2 O3 and Co3 O4. With either 10 vol% H2SO4 or 15 vol% HCI at 80 ℃ more than 95% Sm and Co are leached in 1 *** of Sm from sulphate leach liquor with TBP or Aliquat 336 was poor. Although extraction with TOPS-99 is quantitative but Sm from sulphate leach liquor precipitated as Sm2（SO4）3·8 H2O. The chloride leach liquor at an initial pH of 2.5 and with 1.2 mol/L TOPS-99 shows requirement of 4-stages at A：O = 3：2. Stripping with oxalic acid precipitates Sm-oxalate which is calcined at 800 ℃ to produce Sm2 O3. Co3 O4 is recovered from the raffinate through oxalate precipitation followed by calcination at450℃.

关键词： SmCo magnet Samarium Cobalt TOPS-99 Solvent extraction Precipitation stripping