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Evaluation of microstructure and mechanical properties of Mg-xCe-0.5Zn alloys by nano-indentation

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Transactions of Nonferrous Metals Society of China 2010年第7期20卷 1240-1243页

作者： K.C.PARK b.h.kim Y.h.PARK I.M.PARK Department of Material Science and Engineering Pusan National UniversitySan 30 Jangjeon-dongGeumjeong-guBusan 609-735Korea

The microstructure and mechanical properties of Mg-xCe-0.5Zn （x=0.5, 1.5, 2.5, molar fraction, %） alloys were examined using a nano-indentation technique. The alloys were fabricated using a vacuum induction melting method under an argon atmosphere The microstruetures of Mg-xCe-0.5Zn alloys mainly consist ofa-Mg and eutectic Mg12Ce phase. The volume fraction and size of the eutectic Mgl2Ce phase increase with increasing Ce contents. Nano-indentation test results show that the indentation hardness and elastic modulus of the eutectic Mg12Ce phase are higher than those of the a-Mg matrix. In addition, the mean indentation hardness and elastic modulus of the Mg-xCe-0.5Zn alloys increase with the Ce addition amount increasing.

关键词： Mg alloys Mg-Ce-Zn rare earth microstructure mechanical properties nano-indentation

Effects of Weaving Laser on Weld Microstructure and Crack for Al 6k21-T4 Alloy

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Journal of Materials Science & Technology 2011年第1期27卷 93-96页

作者： b.h.kim N.h.Kang W.T.Oh C.h.kim J.h.kim Y.S.kim Y.h.Park Department of Materials Science and Engineering Pusan National UniversitySan30Jangjeon-dongGeumjeong-guBusan 609-735Korea Department of Materials and Components Engineering Dong-Eui UniversityBusan 614-714Korea Advanced Joining Technology Team KITECH7-47Songdo-dongYeonsu-guIncheon 406-840Korea Division for Dongnam Area Technology Service KITECHJisa-dongGanseo-guBusan 618-230Korea

For Al 6k21-T4 overlap weld joint,the shear-tensile strength by using the weaving laser was improved as compared to the case of linear *** the specimen of low strength,the porosity was distributed continuously along the intersection between the plates and fusion ***,for the optimized welding condition,large oval-shaped porosities were located only in the advancing track of the concave ***,the continuity of cracks and porosities played a key role to determine the ***,the weaving width was also the important parameter to control the ***,the concave part had more significant hot and cold cracking in the weld and heat-affected zone（hAZ）,respectively,than the convex part.

关键词： Weaving laser Weld microstructure Void Al alloy

Effect of Si Content on Mechanical Properties of a Mo and V Free Low Alloy Cast Steel for Automobile Cold Pressing Die

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Journal of Materials Science & Technology 2008年第3期24卷 313-316页

作者： b.h.kim J.S.Shin S.M.Lee b.M.Moon h.D.kim S.Y.Ju O.Y.Choi Advanced Materials R＆D Division Korea Institute of Industrial Technology Incheon 406-840 Korea Tooling Center GM Daewoo Auto ＆ Technology Co. Incheon 403-714 Korea

The effects of Si content on combinations of important properties such as hardness, hardenability, and weldability in addition to strength increment were systematically investigated to develop a Mo and V free low alloy cast steel for automobile cold pressing die insert. For the evaluation of the applicability as the die insert, the mechanical properties were measured after spheroidization annealing （SA）, quenching and tempering （Q/T）, and flame hardening （Fh） treatments, respectively. The developed 0.8%-1.6%Si containing Mo and V free alloy cast steels showed excellent matrix strengthening effect, hardenability, and weldability, fulfilling the industrial criterion of the mechanical properties for the die insert.

关键词： Low alloy cast steel Cold pressing die Die insert Matrix hardening Flame hardening

Oh Diffusion in Silica Glass Preform During Jacketing Process by Oxy-hydrogen burner

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光学学报 2003年第S1期23卷 76-77页

作者： b.h.kim S.R.han U. C.Paek W.-T.han S. K.Oh Department of Information and Communications Kwangju Institute of Science and Technology (K-JIST) I Oryong-dong Buk-gu Gwangju 500-712 South Korea Engineering and R & D group Optical Communication Product Division Information & Communication Business Samsung Electronics Co. LTD. # 94-1 Imsoo-dongGumiGyeong-Buk 730-350 South Korea

Radial distribution of Oh diffusion in silica glass preform during jacketing process using a oxy-hydrogen burner was investigated by FTIR spectroscopy. The Oh peaks at the jacketing boundary and the surface of the pre... 详细信息

关键词： FTIR spectroscopy silica glass

利用深度神经网络模型评估肘部X线片上显示的青春期快速增长的骨龄

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国际医学放射学杂志 2022年第1期 121页

作者： K.S.Ahn b.bae W.Y.Jang J.h.Lee S.Oh b.h.kim 陆秀娣

摘要目的骨龄被认为是诊断性早熟或青春期延迟的指标，也是成年身高的预测指标。旨在评估深度神经网络模型对肘部X线平片上显示的青春期快速增长的骨龄的效能。

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与标准CT灰阶影像和虚拟非钙化影像相比，双能CT电子密度影像对检测颈椎间盘突出的诊断性能

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国际医学放射学杂志 2022年第3期 368页

作者： E.Shim b.h.kim W.Y.Kang S.J.hong C.h.Kang K.S.Ahn 马欢

摘要目的与标准CT(SC)影像和虚拟非钙化(VNCa)CT重组影像相比，评估双能CT(DECT)的电子密度(ED)重组影像在检测颈椎间盘突出的诊断性能。方法该横断面研

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年龄相关的健康大腿肌群变化的多参数MR成像

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国际医学放射学杂志 2018年第3期 356-356页

作者： M.A.Yoon S.J.hong M.C.Ku C.h.Kang K.S.Ahn b.h.kim 刘臻 Department of Radiology Korea University Guro Hospital Korea University College of Medicine

摘要目的应用多参数MR成像来评估和建立健康人大腿肌肉年龄相关的差异。材料与方法共纳入95例体质量指数均正常的受试者(男性47例,女性48例,平均年龄47

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Plant-substrate biochar properties critical for mediating reductive debromination of 1,2-dibromoethane

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Journal of Environmental Sciences 2025年第1期147卷 1-10页

作者： Jonathan h.Lindhardt Peter E.holm Yong-Guan Zhu Changyong Lu hans Christian b.hansen Department of Plant and Environmental Sciences Faculty of ScienceUniversity of CopenhagenThorvaldsensvej 401871 Frederiksberg CDenmark Key lab of Urban Environment and health Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Sino-Danish Center for education and research China and DenmarkDalgas Avenue 4DK-8000 Aarhus C.Denmark

Dibromoethane is a widespread,persistent organic *** are known mediators of reductive dehalogenation by layered Fe^(Ⅱ)-Fe^(Ⅲ)hydroxides(green rust),which can reduce 1,2-dibromoethane to innocuous bromide and ***,the critical characteristics that determine mediator functionality are lesser *** biochar substrates were pyrolyzed at 600℃and 800℃,characterized by elemental analysis,X-ray photo spectrometry C and N surface speciation,X-ray powder diffraction,specific surface area analysis,and tested for mediation of reductive debromination of 1,2-dibromoethane by a green rust reductant under anoxic conditions.A statistical analysis was performed to determine the biochar properties,critical for debromination kinetics and total debromination *** was shown that selected plant based biochars can mediate debromination of 1,2-dibromoethane,that the highest first order rate constant was 0.082/hr,and the highest debromination extent was 27%in reactivity experiments with 0.1μmol(20μmol/L)1,2-dibromoethane,≈22 mmol/L Fe^(Ⅱ)GR,and 0.12 g/L soybean meal biochar(7 days).Contents of Ni,Zn,N,and P,and the relative contribution of quinone surface functional groups were significantly(ph 1,2-dibromoethane debromination,while adsorption,specific surface area,and the relative contribution of pyridinic N oxide surface groups were significantly negatively correlated with debromination.

关键词： Environmental remediation biochar Persistent organic pollutants(POPs) Environmental catalysis Green rust

Plant Cell Wall-Like Soft Materials:Micro-and Nanoengineering,Properties,and Applications

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Nano-Micro Letters 2025年第5期17卷 37-77页

作者： Roya Koshani Mica L.Pitcher Jingyi Yu Christine L.Mahajan Seong h.kim Amir Sheikhi Department of Chemical Engineering The Pennsylvania State UniversityUniversity ParkPA 16802USA Department of Chemistry The Pennsylvania State UniversityUniversity ParkPA 16802USA Department of biology The Pennsylvania State UniversityUniversity ParkPA 16802USA Materials Research Institute The Pennsylvania State UniversityUniversity ParkPA 16802USA Department of biomedical Engineering The Pennsylvania State UniversityUniversity ParkPA 16802USA huck Institutes of the Life Sciences The Pennsylvania State UniversityUniversity ParkPA 16802USA Department of Neurosurgery College of MedicineThe Pennsylvania State UniversityHersheyPA 17033USA

Plant cell wall(CW)-like soft materials,referred to as artificial CWs,are composites of assembled polymers containing micro-/nanoparticles or fibers/fibrils that are designed to mimic the composition,structure,and mechanics of plant ***-like materials have recently emerged to test hypotheses pertaining to the intricate structure–property relationships of native plant CWs or to fabricate functional ***,research on plant CWs and CW-like materials is reviewed by distilling key studies on biomimetic composites primarily composed of plant polysaccharides,including cellulose,pectin,and hemicellulose,as well as organic polymers like ***-and nanofabrication of plant CW-like composites,characterization techniques,and in silico studies are reviewed,with a brief overview of current and potential ***-/nanofabrication approaches include bacterial growth and impregnation,layer-by-layer assembly,film casting,3-dimensional templating microcapsules,and particle *** characterization techniques are necessary for the comprehensive mechanical,chemical,morphological,and structural analyses of plant CWs and CW-like ***-like materials demonstrate versatility in real-life applications,including biomass conversion,pulp and paper,food science,construction,catalysis,and reaction *** review seeks to facilitate the rational design and thorough characterization of plant CW-mimetic materials,with the goal of advancing the development of innovative soft materials and elucidating the complex structure–property relationships inherent in native CWs.

关键词： Synthetic plants biomimicry Acellular wall Composites Living materials Soft matter