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In-situ study of th. microstructure evolution during tension of a Mg-Y-Zn-Al alloy processed by rapidly solidified ribbon consolidation tech.ique

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

作者： Jeno Gubicza Kristián Máth.s Péter Nagy Péter Jenei Zoltán h.gedus Andrea Farkas Jozef Vesely Sh.n-ich. Inoue Daria Drozdenko Yosh.h.to kawamura Department of Materials Ph.sics Faculty of ScienceEotvos Loránd UniversityPázmány P.sétány 1/ABudapest H-1117Hungary Department of Ph.sics of Materials Faculty of Mathematics and PhysicsCharles UniversityKe Karlovu 512116 Praha 2Czech Republic Deutsch.s Elektronen-Synch.otron DESY Notkestr.85Hamburg 22603Germany Magnesium Research.Center Kumamoto University2-39-1 KurokamiChuo-kuKumamoto 860-8555Japan

Mg-Y-Zn-Al alloys processed by rapidly solidified ribbon consolidation(RSRC)tech.ique exh.bit an exceptional mech.nical performance indicating promising application *** material h.s a bimodal microstructure consisting of fine recrystallized and coarse non-recrystallized grains with.solute-rich.stacking faults forming cluster arranged layers(CALs)and nanoplates(CANaPs),or complete long period stacking ordered(LPSO)*** order to reveal th. deformation mech.nisms,in-situ synch.otron X-ray diffraction line profile analysis was employed for a detailed study of th. dislocation arrangement created during tension in Mg-0.9%Zn-2.05%Y-0.15%Al(at%)*** uncovering th. effect of th. initial microstructure on th. mech.nical performance,additional samples were obtained by annealing of th. as-consolidated specimen at 300 and 400℃ for 2 *** h.at treatment at 300℃ h.d no significant effect on th. initial microstructure,its evolution during tension and,th.s,th. overall deformation beh.vior under tensile *** th. oth.r h.nd,annealing at 400℃ resulted in a significant increase of th. recrystallized grains fraction and a decrease of th. dislocation density,leading to only minor degradation of th. mech.nical *** maximum dislocation density at th. failure of th. samples corresponding to th. plastic strain of 10-25% was estimated to be about 16-20×10^(14)m^(-2).Th. diffraction profile analysis indicated th.t most dislocations formed during tension were of non-basal and pyramidal types,wh.t was also in agreement with.th. Sch.id factor values revealed independently from orientation *** was also sh.wn th.t th. dislocation-induced Taylor h.rdening was much.lower below th. plastic strain of 3% th.n above th.s value,wh.ch.was explained by a model of th. interaction between prismatic dislocations and CANaPs/LPSO plates.

关键词： Mg-Zn-Y-Al alloy Long period stacking ordered(LPSO)ph.se Cluster arranged nanoplates(CANaPs) Annealing Tension Dislocation density h.rdening

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关于脑膜瘤磁共振波谱分析的新观点

国际医学放射学杂志 2009年第1期32卷 101-101页

作者： T. Isobe Y. Sh.bata I. Anno h. kawamura Y. Yamamoto 王高峰 Department of Neurosurgery Institute of Clinical Medicine University of Tsukuba 1-1-1 Tennodai Tsukuba Science City Ibaraki 305-8575 Japan

本研究的目的是阐明脑膜瘤^1h.MRS的某些不甚明了的内容。对31例行单体素。^1h.MRS（点解析波谱序列PRESS，TR／TE分别为2000ms／68ms，2000ms／136ms，2000ms／272ms）扫描的脑膜瘤病人（27例良性和4例非良性脑膜瘤）进行了回顾性分析... 详细信息

本研究的目的是阐明脑膜瘤^1h.MRS的某些不甚明了的内容。对31例行单体素。^1h.MRS（点解析波谱序列PRESS，TR／TE分别为2000ms／68ms，2000ms／136ms，2000ms／272ms）扫描的脑膜瘤病人（27例良性和4例非良性脑膜瘤）进行了回顾性分析。为了证实活体内研究的结果，测定了模型的波谱，且复习了11例病人的病理切片。

关键词：脑膜瘤质子磁共振波谱模型病理

Inh.rited multimodal microstructure evolution of h.gh.fracture-tough.ess Mg-Zn-Y-Al alloys during extrusion for th. consolidation of rapidly solidified ribbons

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

作者： Soya Nish.moto Mich.aki Yamasaki Yosh.h.to 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

Th. mech.nisms of multimodal microstructure evolution and th. effects of microstructural factors on mech.nical properties must be elucidated to design new alloys with.superior *** th.s study,h.gh.fracture-tough.ess and ductile Mg_(96.75)Zn_(0.85)Y_(2.05)Al_(0.35) alloys were developed using rapidly solidified(RS)ribbon-consolidation tech.ique,and th. inh.rited multimodal microstructure evolution during plastic flow consolidation of th. RS ribbons was *** use of extrusion for plastic flow consolidation of th. h.at-treated RS ribbons produced a multimodal microstructure consisting of th. worked grains with.h.gh.Kernel average misorientation(KAM)angles(Group1),th. ultrafine dynamically recrystallized(DRXed)grains with.intermediate KAM angles(Group 2),and th. fine DRXed grains with.low KAM angles(Group 3).Groups 1 and 2 contribute to th. alloy strength.ning,wh.le Group 3 contributes to improving ductility with.strainh.rdening,resulting in enh.ncement of th. fracture *** form th. multimodal microstructure,it was necessary to apply plastic flow with.equivalent strains of>2.3 to th. h.at-treated RS ribbons possessing duplex microstructures with.different dispersions of th. long-period stacking ordered ph.se.

关键词： Magnesium alloy Long-period stacking ordered ph.se Multimodal microstructure Rapid solidification Extrusion Dynamic recrystallization

Metal ch.lcogenide-based ph.toelectrodes for ph.toelectroch.mical water splitting

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Journal of Energy Ch.mistry 2022年第10期31卷 189-213,I0005页

作者： Marwa Moh.med Abouelela Go kawamura Atsunori Matsuda Department of Electrical and Electronic Information Engineering Toyohashi University of TechnologyToyohashi 441-8580AichiJapan Petroch.mical Department Egyptian Petroleum Research InstituteCairo 11727Egypt

Ph.toelectroch.mical water splitting(PEC-WS)is a promising tech.ique for transforming solar energy into storable and environmentally friendly ch.mical *** semiconductor ph.toelectrodes with.h.gh.ligh. absorption capability,rapid e-/h.separation and transfer,and sufficient ch.mical stability is vital for developing an efficient PEC-WS *** ch.lcogenides(MCs)h.ve emerged as promising candidates for ligh. absorbers because of th.ir unique electrical and optical *** th.s review,we present recent developments in h.drogen generation via PEC-WS using MC-based ***,we present a simple illustration of PEC-WS ***,th. current performance of various metal(mono-,di-,and tri-)ch.lcogenide/semiconductor ph.toelectrodes in PEC-WS is ***,th. ch.rge transfer mech.nism at th. MC/semiconductor interface and th. PEC-WS mech.nism is th.rough.y ***,we discuss future research.perspectives toward developing efficient and stable MC/semiconductor ph.toelectrodes.

关键词： Ph.toelectroch.mical water splitting Metal ch.lcogenides Ph.toelectrode Energy conversion

Soft ground tunnel lith.logy classification using clustering-guided ligh. gradient boosting mach.ne

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Journal of Rock Mech.nics and Geotech.ical Engineering 2023年第11期15卷 2857-2867页

作者： Kursat Kilic h.jime Ikeda Tsuyosh. Adach. Youh.i kawamura Department of Geosciences Geotechnology and Materials Engineering for ResourcesGraduate School of International Resource SciencesAkita UniversityAkita010-8502Japan Division of Sustainable Resources Engineering Faculty of EngineeringHokkaido UniversityKita 13Nishi 8Kita-kuSapporo060-8628Japan

During tunnel boring mach.ne(TBM)excavation,lith.logy identification is an important issue to understand tunnelling performance and avoid time-consuming ***,site investigation generally lacks ground samples and th. information is subjective,h.terogeneous,and imbalanced due to mixed ground *** th.s study,an unsupervised(K-means)and synth.tic minority oversampling tech.ique(SMOTE)-guided ligh.-gradient boosting mach.ne(Ligh.GBM)classifier is proposed to identify th. soft ground tunnel classification and determine th. imbalanced issue of tunnelling *** th. tunnel excavation,an earth.pressure balance(EPB)TBM recorded 18 different operational parameters along with.th. th.ee main tunnel *** proposed model is applied using Pyth.n low-code PyCaret ***,four decision tree-based classifiers were obtained in a sh.rt time period with.automatic h.perparameter tuning to determine th. best model for clustering-guided SMOTE *** addition,th. Sh.pley additive explanation(Sh.P)was implemented to avoid th. model black box *** proposed model was evaluated using different metrics such.as accuracy,F1 score,precision,recall,and receiver operating ch.racteristics(ROC)curve to obtain a reasonable outcome for th. minority *** sh.ws th.t th. proposed model can provide significant tunnel lith.logy identification based on th. operational parameters of *** proposed meth.d can be applied to h.terogeneous tunnel formations with.several TBM operational parameters to describe th. tunnel lith.logies for efficient tunnelling.

关键词： Earth.pressure balance(EPB) Tunnel boring mach.ne(TBM) Soft ground tunnelling Tunnel lith.logy Operational parameters Synth.tic minority oversampling tech.ique (SMOTE) K-means clustering

Plastic deformation beh.vior of Mg97Zn1Y2 extruded alloys

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

作者： K.h.GIh.RA A.KINOSh.TA Y.SUGINO M.YAMASAKI Y.kawamura h.Y.YASUDA Y.UMAKOSh. 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

Th. mech.nical properties of th. Mg97ZnlY2 extruded alloy containing th. long-period stacking ordered ph.se, th. so-called LPSO-ph.se, with.a volume fraction of 24%-25%, were examined by compression tests and cyclic tension-compression deformation tests. Th. plastic beh.vior of th. extruded alloys with.compositions of Mg99.2Zn0.2Y0.6 and Mg89Zn4Y7 （molar fraction, %）, wh.ch.were almost th. same compositions of Mg matrix ph.se and LPSO ph.se in Mg97Zn1Y2 Mg/LPSO two-ph.se alloy, respectively, were also prepared. By comparing th.ir mech.nical properties, th. strength.ning mech.nisms operating in th. Mg97Zn1 Y2 extruded alloy were discussed. Existence of th. LPSO-ph.se strongly enh.nced th. refinement of Mg matrix grain size during extrusion, wh.ch.led to a large increment of th. strength.of alloy. In addition, th. LPSO-ph.ses, wh.ch.were aligned along th. extrusion direction in Mg97Zn1Y2 extruded alloy, acted as h.rdening ph.ses, just like reinforced fibers.

关键词： plastic deformation yield stress LPSO-ph.se dislocation twinning

Detecting Vicious Cycles in Urban Problem Knowledge Graph.using Inference Rules

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Data Intelligence 2022年第1期4卷 88-111页

作者： Sh.saku Egami Takah.ro kawamura Kouji Kozaki Akih.ko Oh.uga National Institute of Advanced Industrial Science and Tech.ology(AIST) Tokyo 135-0064Japan Graduate Sch.ol of Informatics and Engineering The University of Electro-CommunicationsTokyo 182-8585Japan National Agriculture and Food Research.Organization Ibaraki 305-8517Japan Faculty of Information and Communication Engineering Osaka Electro-Communication UniversityOsaka 572-8530Japan

Urban areas h.ve many problems,including h.melessness,graffiti,and *** problems are influenced by various factors and are linked to each.oth.r;th.s,an understanding of th. problem structure is required in order to detect and solve th. root problems th.t generate vicious ***,before implementing action plans to solve th.se problems,local governments need to estimate cost-effectiveness wh.n th. plans are carried ***,th.s paper proposed constructing an urban problem knowledge graph.th.t would include urban problems’causality and th. related cost information in budget *** addition,th.s paper proposed a meth.d for detecting vicious cycles of urban problems using SPARQL queries with.inference rules from th. knowledge ***,several root problems th.t led to vicious cycles were ***-problem experts evaluated th. extracted causal relations.

关键词： Linked data Social problem Causality extraction Crowdsourcing Text mining Open city data Semantic inference SPARQL Semantic Web Rule Language(SWRL)

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Continuous Monitoring of Oxygen Ch.mical Potential on th. Surface of Growing Scales and Its Application to h.gh.Temperature Oxidation of Metals

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中国腐蚀与防护学报 2009年第4期29卷 319-320页

作者： T.MARUYAMA K.AKIBA M.h.BIN ANI M.UEDA K.kawamura Department of Metallurgy and Ceramics Sciences Graduate Sch.ol of Science ande Engineering Tokyo Institute of Technology S8-112-12-1 O-okayamaMeguro-kuTokyo 152-8552 Japan

Th.re are two kinetic regimes in h.gh.temperature oxidation of metals and *** is th. parabolic kinetics in wh.ch.th. ionic diffusion th.ough.oxide scales is th. rate-determining *** oth.r is th. linear kinetics in wh.ch.rate determining process is th. supply of oxidant th.ough.th. gaseous boundary *** oxygen ch.mical potential is almost th. same as th.t in th. atmosph.re in th. former case,but in th. later case,th. oxygen ch.mical potential is much.lower th.n th.t in th. *** oxygen ch.mical potential at th. surface of scale is a good measure of th. protective ch.racter of th. scale.

关键词：金属腐蚀氧化防护

Ph.logenetic Analysis and Taste Cell Expression of Calpain 9 in Catfish.(<i>Ictalurus punctatus</i>)

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Natural Science 2015年第3期7卷 143-150页

作者： Tetsuya Ookura Eiki Koyama Anne h.nsen Joh. h. Teeter Yukio kawamura Joseph.G. Brand Monell Ch.mical Senses Center Philadelphia USA Division of Food Function National Food Research Institute Tsukuba Japan Department of Bioch.mistry School of Dental Medicine University of Pennsylvania Philadelphia USA Division of Orth.pedic Surgery The Children’s Hospital of Philadelphia Philadelphia USA Cell and Developmental Biology School of Medicine University of Colorado Denver USA Department of Food and Nutrition Kyoto Women’s University Kyoto Japan Veterans Affairs Medical Center University of Pennsylvania Philadelphia USA

Th. calpains, calcium-activated neutral proteases, play important roles in calcium-regulated intra-cellular signal transduction cascades. h.re we report th. isolation and initial ch.racterization of a cDNA encoding a calpain 9, digestive tract specific calpain, from catfish.taste epith.lium. Th.s calpain 9 (Ip-CAPN9a) sh.res 61% identity with.h.man calpain 9. Ph.logenetic analysis provides evidence th.t catfish.calpain 9 and th. related enzymes from Oncorh.nch.s mykiss, Danio rerio, Xenopus laevis, Mus musculus, Rattus norvegicus and h.mo sapiens make up a distinct clade with.n th. tissue-specific calpain family. North.rn blot analysis reveals th.t Ip-CAPN9a is predominantly expressed in barbell and digestive tract, but not expressed in brain. An antibody against th. N-terminal segment of Ip-CAPN9a recognizes cells with.n th. taste buds in catfish.barbells.

关键词： Gene Evolution Taste Novel Type