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In-situ study.of the microstructure evolution during tension of a Mg-y.Zn-Al alloy.processed by.rapidly.solidified ribbon consolidation technique

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Journal of Magnesium and Alloy. 2024年第5期12卷 2024-2040页

作者： Jeno Gubicza Kristián Máthis Péter Nagy.Péter Jenei Zoltán Hegedus Andrea Farkas Jozef Vesely.Shin-ichi Inoue Daria Drozdenko y.shihito kawamura Department of Materials Phy.ics Faculty of ScienceEotvos Loránd UniversityPázmány P.sétány 1/ABudapest H-1117Hungary Department of Phy.ics of Materials Faculty of Mathematics and PhysicsCharles UniversityKe Karlovu 512116 Praha 2Czech Republic Deutsches Elektronen-Sy.chrotron DESy Notkestr.85Hamburg 22603Germany Magnesium Research Center Kumamoto University2-39-1 KurokamiChuo-kuKumamoto 860-8555Japan

Mg-y.Zn-Al alloy. processed by.rapidly.solidified ribbon consolidation(RSRC)technique exhibit an exceptional mechanical performance indicating promising application *** material has a bimodal microstructure consisting of fine recry.tallized and coarse non-recry.tallized grains with solute-rich stacking faults forming cluster arranged lay.rs(CALs)and nanoplates(CANaPs),or complete long period stacking ordered(LPSO)*** order to reveal the deformation mechanisms,in-situ sy.chrotron X-ray.diffraction line profile analy.is was employ.d for a detailed study.of the dislocation arrangement created during tension in Mg-0.9%Zn-2.05%y.0.15%Al(at%)*** uncovering the effect of the initial microstructure on the mechanical performance,additional samples were obtained by.annealing of the as-consolidated specimen at 300 and 400℃ for 2 *** heat treatment at 300℃ had no significant effect on the initial microstructure,its evolution during tension and,thus,the overall deformation behavior under tensile *** the other hand,annealing at 400℃ resulted in a significant increase of the recry.tallized grains fraction and a decrease of the dislocation density.leading to only.minor degradation of the mechanical *** maximum dislocation density.at the failure of the samples corresponding to the plastic strain of 10-25% was estimated to be about 16-20×10^(14)m^(-2).The diffraction profile analy.is indicated that most dislocations formed during tension were of non-basal and py.amidal ty.es,what was also in agreement with the Schmid factor values revealed independently.from orientation *** was also shown that the dislocation-induced Tay.or hardening was much lower below the plastic strain of 3% than above this value,which was explained by.a model of the interaction between prismatic dislocations and CANaPs/LPSO plates.

关键词： Mg-Zn-y.Al alloy Long period stacking ordered(LPSO)phase Cluster arranged nanoplates(CANaPs) Annealing Tension Dislocation density Hardening

慢性丙型肝炎患者行放血术后血清ALT正常的决定因素

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世界核心医学期刊文摘（胃肠病学分册） 2006年第3期2卷 55-55页

作者： kawamura y. Akuta N. Sezaki H. 程妍 Department of Gastroenterology Toranomon Hospital 2-2-2 Toranomon Minato-ku Tokyo 105-8470 Japan

Background: Phlebotomy.is performed to reduce excessive iron accumulation in hepatic tissue. We studied serum alanine aminotransferase (ALT) normalization rates and 50%reduction in initial serum ALT (ALT50%reduction rate) in patients with hepatitis C viral (HCV) infection and investigated the factors that influenced the response to phlebotomy.therapy. Methods: We evaluated 23 consecutive patients with HCV infection who underwent phlebotomy. Phlebotomy.was performed a few times per week, then a few times per month, and 200-400 ml of blood was removed at each session, depending on the clinical response. During the course of therapy. hemoglobin (Hb), serum ALT, and ferritin levels were assessed monthly. Results: In patients with Hb of less than 11 g/dl, the ALT50%reduction rate was 87.5%. In patients with a serum ferritin level of less than 10 g/dl the ALT50%reduction rate was 83.3%. In patients with Hb of less than 11 g/dl, the ALT normalization rate was 50%, and in those with a serum ferritin level of less than 10 g/dl, the ALT normalization rate was 41.7%. Multivariate analy.is identified ALT less than 100 IU/l at the start of phlebotomy.as an independent factor associated with ALT normalization. Of the 7 patients who showed no response to phlebotomy. 85.7%were obese (body.mass index ≥25 kg/m2), and 40%showed more than 30%steatosis on liver histology. The cumulative ALT normalization rate in relation to the total volume of blood loss was 43.9%with a blood less or more than 3l, and thus was optimal above 3l. Conclusions: Although the sample number was relatively.small, the results of our study.suggest that phlebotomy.is effective therapy.for HCV patients who are nonobese, show little or no steatosis on liver histology. and have a baseline serum ALT level of less than 100IU/l.

关键词：丙型肝炎患者 ALT正常术后血清丙型肝炎病毒放血术肝组织学血清铁蛋白减少率脂肪变性临

Effective Palladium(Ⅱ) Cataly.t for Oxy.alladation of Alkene

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复旦学报(自然科学版) 2005年第5期 101-102页

作者： T. Hosokawa,y. kawamura,K. Minami,K. Koga Department of Environmental Sy.tems Engineering Kochi University.of Technology 185 Miy.nokuchi Tosay.mada Kochi 782-8502 Japan Department of Environmental Sy.tems Engineering Kochi University.of Technology 185 Miy.nokuchi Tosay.mada Kochi 782-8502 Japan Department of Environmental Sy.tems Engineering Kochi University.of Technology 185 Miy.nokuchi Tosay.mada Kochi 782-8502 Japan Department of Environmental Sy.tems Engineering Kochi University.of Technology 185 Miy.nokuchi Tosay.mada Kochi 782-8502 Japan

Plastic deformation behavior of Mg97Zn1y. extruded alloy.

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Transactions of Nonferrous Metals Society.of China 2010年第7期20卷 1259-1268页

作者： K.HAGIHARA A.KINOSHITA y.SUGINO M.y.MASAKI y.kawamura H.y.y.SUDA y.UMAKOSHI Division of Materials and Manufacturing Science Graduate School of EngineeringOsaka University2-1Yamada-okaSuitaOsaka 565-0871Japan Department of Materials Science Kumamoto University2-39-1KurokamiKumamoto 860-8555Japan National Institute for Materials Science 1-2-1SengenTsukubaIbaraki 305-0047Japan

The mechanical properties of the Mg97Znly. extruded alloy.containing the long-period stacking ordered phase, the so-called LPSO-phase, with a volume fraction of 24%-25%, were examined by.compression tests and cy.lic tension-compression deformation tests. The plastic behavior of the extruded alloy. with compositions of Mg99.2Zn0.2y..6 and Mg89Zn4y. （molar fraction, %）, which were almost the same compositions of Mg matrix phase and LPSO phase in Mg97Zn1y. Mg/LPSO two-phase alloy. respectively. were also prepared. By.comparing their mechanical properties, the strengthening mechanisms operating in the Mg97Zn1 y. extruded alloy.were discussed. Existence of the LPSO-phase strongly.enhanced the refinement of Mg matrix grain size during extrusion, which led to a large increment of the strength of alloy. In addition, the LPSO-phases, which were aligned along the extrusion direction in Mg97Zn1y. extruded alloy. acted as hardening phases, just like reinforced fibers.

关键词： plastic deformation y.eld stress LPSO-phase dislocation twinning

Inherited multimodal microstructure evolution of high-fracture-toughness Mg-Zn-y.Al alloy. during extrusion for the consolidation of rapidly.solidified ribbons

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Journal of Magnesium and Alloy. 2022年第9期10卷 2433-2445页

作者： Soy. Nishimoto Michiaki y.masaki y.shihito kawamura Department of Materials Science Graduate School of Science and TechnologyKumamoto University2-39-1 KurokamiChuo-kuKumamoto 860-8555Japan Magnesium Research Center Kumamoto University2-39-1 KurokamiChuo-kuKumamoto 860-8555Japan

The mechanisms of multimodal microstructure evolution and the effects of microstructural factors on mechanical properties must be elucidated to design new alloy. with superior *** this study.high-fracture-toughness and ductile Mg_(96.75)Zn_(0.85)y.(2.05)Al_(0.35) alloy. were developed using rapidly.solidified(RS)ribbon-consolidation technique,and the inherited multimodal microstructure evolution during plastic flow consolidation of the RS ribbons was *** use of extrusion for plastic flow consolidation of the heat-treated RS ribbons produced a multimodal microstructure consisting of the worked grains with high Kernel average misorientation(KAM)angles(Group1),the ultrafine dy.amically.recry.tallized(DRXed)grains with intermediate KAM angles(Group 2),and the fine DRXed grains with low KAM angles(Group 3).Groups 1 and 2 contribute to the alloy.strengthening,while Group 3 contributes to improving ductility.with strainhardening,resulting in enhancement of the fracture *** form the multimodal microstructure,it was necessary.to apply.plastic flow with equivalent strains of>2.3 to the heat-treated RS ribbons possessing duplex microstructures with different dispersions of the long-period stacking ordered phase.

关键词： Magnesium alloy Long-period stacking ordered phase Multimodal microstructure Rapid solidification Extrusion Dy.amic recry.tallization

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静止水中单个上升气泡的直接数值模拟

工程热物理学报 2005年第6期26卷 980-982页

作者：陈斌 T.kawamura y.Kodama 西安交通大学动力工程多相流国家重点实验室陕西西安710049 东京大学大学院工学系研究科环境海洋专攻应用流体工学实验室日本海上技术安全研究所紊流灵巧控制中心

本文发展了基于Front Tracking的直接数值模拟方法研究气液两相界面的迁移特性,该方法对气液两相采用半隐式的分步法直接求解N-S方程,耦合Front Tracking Method获得两相界面的三维变形。针对无边界以及垂直壁面附近静止水中的单个气泡... 详细信息

本文发展了基于Front Tracking的直接数值模拟方法研究气液两相界面的迁移特性,该方法对气液两相采用半隐式的分步法直接求解N-S方程,耦合Front Tracking Method获得两相界面的三维变形。针对无边界以及垂直壁面附近静止水中的单个气泡上升过程进行模拟,研究气泡运动的机理以及气泡与壁面的相互作用。数值模拟准确再现了气泡的上升过程和变形,不同Re数下气泡的上升速度计算结果同经验关联式非常吻合,验证了该方法的有效性。随后分析了气泡周围流场的结构,发现壁面对气泡周围流场的抑制是壁面对气泡作用力的主要原因,将导致气泡逐渐偏离垂直壁面。

关键词：直接数值模拟界面追踪法气泡变形壁面作用力

Effective Palladium(Ⅱ)Cataly.t for Oxy.alladation of Alkene

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复旦学报(自然科学版) 2005年第5期44卷 711-712页

作者： T.Hosokawa y.kawamura K.Minami K.Koga Department of Environmental Sy.tems Engineering Kochi University of Technology185 MiyanokuchiTosayamadaKochi782-8502Japan

1 Introduction A variety.of Pd(Ⅱ)-cataly.ed oxidative transformations ot allcenes with oxy.en nucleophiles are cataly.ed by.PdX_(2)(X=OAc,Cl,etc)with CuX_(n)(n=1 or 2)under O_(2).In the so-called Wacker cataly.t of such,Pd(OAc)_(2) is less reactive compared to PdCl_(2).In an attempt to increase the reactivity.of Pd(OAc)_(2),we have now found that tuning of Cu site with catechol gives an intriguing reactivity.to Pd(OAc)_(2),which is unprecedented in the chemistry.of palladium.

关键词： Palladium(Ⅱ)acetate copper(Ⅱ)acetate catechol wacker oxidation ally.ic alcohols viny. ethers 2-alkoxy.4-benzy.idenetetrahy.rofurans

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纯化眼镜蛇类毒素的稳定性的研究

动物学杂志 1991年第3期26卷 52-54页

作者： y.kawamura y.SAWAI 商孝同日本蛇类研究所

已有一些科学工作者对眼镜蛇毒类毒素的纯化、失活和免疫进行了广泛的研究(Sawai等,1973;Fukuy.ma,1974;Fukuy.ma和Sawai,1974)。还有报道说,眼镜蛇毒类毒素,在37℃条件下保存20天后,给鼠腹腔注射,能致死;而保存在4℃或保存在37℃冻干... 详细信息

已有一些科学工作者对眼镜蛇毒类毒素的纯化、失活和免疫进行了广泛的研究(Sawai等,1973;Fukuy.ma,1974;Fukuy.ma和Sawai,1974)。还有报道说,眼镜蛇毒类毒素,在37℃条件下保存20天后,给鼠腹腔注射,能致死;而保存在4℃或保存在37℃冻干的类毒素则无毒性(Fukuy.ma和Sawai,1975;Sawai和Fukuy.ma,1978)。本文是有关台湾眼镜蛇毒类毒素的纯化、稳定性及其免疫原性的研究。

关键词：眼镜毒蛇毒提纯稳定性

Crumbs proteins stabilize the cone mosaics of photoreceptors and improve vision in zebrafish

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Journal of Genetics and Genomics 2021年第1期48卷 52-62页

作者： Qinlong Hao Mingjie Zheng Kechao Weng y.mei Hao y.o Zhou y.chen Lin Feng Gao Ziqi Kou Shoji kawamura Ke y.o Pinglong Xu Jinghai Chen Jian Zou Ey. Center of the Second Affiliated Hospital School of MedicineZhejiang UniversityHangzhou 310009China The Institute of Translational Medicine Zhejiang UniversityHangzhou 310058China Department of Cardiology The Second Affiliated HospitalSchool of MedicineZhejiang UniversityHangzhou 310009China Department of Integrated Biosciences Graduate School of Frontier SciencesUniversity of TokyoKashiwaChiba 277-8562Japan Zhejiang Provincial Key.Lab of Ophthalmology Hangzhou 310058China MOE Laboratory.of Biosy.tems Homeostasis&Protection and Innovation Center for Cell Signaling Network Life Sciences InstituteZhejiang UniversityHangzhou 310058China

Although the unique organization of vertebrate cone mosaics was first described long ago,both their underly.ng molecular basis and phy.iological significance are largely.***,we demonstrate that Crumbs proteins,the key.regulators of epithelial apical polarity.establish the planar cellular polarity.of photoreceptors in *** heterophilic Crb2a-Crb2b interactions,the apicobasal polarity.protein Crb2b restricts the asy.metric planar distribution of Crb2a in *** planar polarized Crumbs proteins thus balance intercellular adhesions and tension between photoreceptors,thereby.stabilizing the geometric organization of cone ***,loss of Crb2b in zebrafish induces a nearsightedness-like phenoty.e in zebrafish accompanied by.an elongated ey. axis and impairs zebrafish visual perception for *** data reveal a detailed mechanism for cone mosaic homeostasis via previously.undiscovered apical-planar polarity.coordination and propose a pathogenic mechanism for nearsightedness.

关键词： Crumbs proteins Apical polarity Planar cellular polarity Cone mosaics Nearsightedness Visual perception