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Effects of Craddition on Charpy impact energy in austenitic 0.45C-24Mn-(0,3,6)Cr steels

Journal of Materials Science & Technology 2020年第15期47卷 21-30页

作者： Seok Gyu lee Bohee Kim Min Cheol Jo Kyeong-Min Kim Junghoon lee Jinho Bae Byeong-Joo lee Seok su Sohn sunghak lee Center for Advanced Aerospace Materials Pohang University of Science and TechnologyPohang37673South Korea Steel Products Design Team Hyundai SteelDangjin31779South Korea Steel Products Research Group 1 Technical Research LaboratoriesPOSCOGwangyang57807South Korea Department of Materials Science and Engineering Korea UniversitySeoul02841South Korea

Effects of Cr addition(0,3,and 6 wt%) on Charpy impact properties of Fe-C-Mn-Cr-based steels were studied by conducting dynamic compression tests at room and cryogenic *** room temperature,deformation mechanisms of Charpy impacted specimens were observed as twinning induced plasticity(TWIP) without any transfo rmation induced plasticity(TRIP) in all the *** cryogenic temperature,many twins were populated in the Cr-added steels,but,interestingly,fine ε-martensite was found in the OCr steel,satisfying the Shoji-Nishiyama(S-N) orientation relationship,{111}γ//{0002}ε and γ//ε.Even though the cryogenic-temperature staking fault energies(SFEs) of the three steel were situated in the TWIP regime,the martensitic transformation was induced by Mn-and Cr-segregated *** the OCr steel,SFEs of low-(Mn,Cr) bands lay between the TWIP and TRIP regimes which were sensitively affected by a small change of *** dynamic compressive test results well showed the relation between segregation bands and the *** of Cr were known as not only increasing the SFE but also promoting the carbide *** order to identify the possibility of carbide formation,a precipitation kinetics simulation was conducted,and the predicted fractions of precipitated M23C6 were negligible,0.4-1.1×10-5,even at the low cooling rate of 10℃/s.

关键词： Austenitic high-Mn steels Charpy impact energy Split Hopkinson pressure bar Twinning induced plasticity(TWIP) Transformation induced plasticity(TRIP) Stacking fault energy(SFE)

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Congestive ischemic colitis successfully treated with antiinflammatory therapy: A case report

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World Journal of Clinical Cases 2024年第1期12卷 142-147页

作者： Geon Woo lee su Bum Park Department of Internal Medicine Pusan National University School of Medicine and Research Institute for Convergence of Biomedical Science and TechnologyPusan National University Yangsan HospitalYangsan 50612South Korea

BACKGROUND Congestive ischemic colitis is a rare subtype of ischemic colitis with an unknown *** conservative management,such as fasting,no established treatment exists;therefore,surgical intervention should be considered in some cases if symptoms *** literature suggests that anti-inflam-matory agents may effectively treat congestive ischemic *** suMMARY We present the case of a 68-year-old female patient who underwent laparoscopic left hemicolectomy for transverse colon cancer 3 years ***,follow-up included an annual colonoscopy and abdominal computed tomography(CT)at a local ***,progressive erythema and edema of the sigmoid colon were observed 1 year *** admission to our hospital,she complained of abdominal pain and *** CT showed thickening of the sigmoid colon walls,and colonoscopy revealed erythema,edema,and multiple ulcers with exudate in the sigmoid *** angiography showed engorgement of the sigmoid vasa recta without any vascular *** diagnosis was congestive ischemic colitis,and we treated the patient with anti-inflammatory *** 2 mo of glucocorticoid therapy(20 mg once daily)and 7 mo of 5-aminosalicylate therapy(1 g twice daily),the ulcers completely *** has not experienced any recurrence for 2 *** Anti-inflammatory therapy,specifically glucocorticoids and 5-aminosalicylate,has demonstrated promising efficacy and introduces potential novel treatment options for congestive ischemic colitis.

关键词： Ischemic colitis Glucocorticoids 5-aminosalicylate Colon cancer

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Understanding the physical metallurgy of the CoCrFeMnNi high-entropy alloy:an atomistic simulation study

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npj Computational Materials 2018年第1期4卷 662-670页

作者： Won-Mi Choi Yong Hee Jo Seok su Sohn sunghak lee Byeong-Joo lee Department of Material Science and Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea

Although high-entropy alloys(HEAs)are attracting interest,the physical metallurgical mechanisms related to their properties have mostly not been clarified,and this limits wider industrial applications,in addition to the high alloy *** clarify the physical metallurgical reasons for the materials phenomena(sluggish diffusion and micro-twining at cryogenic temperatures)and investigate the effect of individual elements on solid solution hardening for the equiatomic CoCrFeMnNi HEA based on atomistic simulations(Monte Carlo,molecular dynamics and molecular statics).A significant number of stable vacant lattice sites with high migration energy barriers exists and is thought to cause the sluggish *** predict that the hexagonal close-packed(hcp)structure is more stable than the face-centered cubic(fcc)structure at 0 K,which we propose as the fundamental reason for the micro-twinning at cryogenic *** alloying effect on the critical resolved shear stress(CRSS)is well predicted by the atomistic simulation,used for a design of non-equiatomic fcc HEAs with improved strength,and is experimentally *** study demonstrates the applicability of the proposed atomistic approach combined with a thermodynamic calculation technique to a computational design of advanced HEAs.

关键词： alloy alloying entropy

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Effects of Temperature on Photosynthetic Rates in Korean Fir (Abies koreana) between Healthy and Dieback Population

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Journal of Integrative Plant Biology 2008年第2期50卷 190-193页

作者： su Young Woo Jong-Hwan Lim Don Koo lee Department of Environmental Horticulture University of Seoul Seoul 130-743 Republic of Korea Korea Forest Research Institute Seoul 130-712Republic of Korea Department of Forest Sciences College of Agriculture and Life SciencesSeoul National UniversitySeoul 151-921Republic of Korea

The present study was carried out on natural Korean fir forests （Abies koreana） growing in Mount Halla in Jeju Island, Korea （33° 13-36＇ N and 126° 12-57＇ E）. Mount Halla is the highest mountain （1 950 m a.s.h） in South Korea. On the Korean fir forests near the top of Mount Halla in Korea, we established permanent plots between dieback and healthy population. Each permanent plot includes both dieback and relatively healthy Korean fir individuals. Three sites in this study showed similar altitude, topographic position, aspects, slope, diameter at breast height, average height and ages. Net photosynthetic rates （PN） on different temperature regimes were evaluated to explain the forest dieback phenomenon on Korean fir populations. Light response curves were determined on three different temperature regimes： 15 ℃, 20℃ and 25℃. The irradiance response curve showed higher values in lower air temperatures. Generally, irradiance response curves of healthy Korean fir populations were higher than the dieback population at all sites.

关键词： Abies koreana global warming forest decline photosynthetic rates temperature.

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Synergistic Effect of Core/Shell‑Structured Composite Fibers:Efficient Recovery of Rare‑Earth Elements from Spent NdFeB Permanent Magnets

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Advanced Fiber Materials 2024年第6期6卷 1729-1745页

作者： Youngkyun Jung Yun lee su‑Jin Yoon Jae‑Woo Choi Center for Water Cycle Research Korea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Department of Chemical and Biological Engineering Korea UniversitySeoul 02841Republic of Korea Department of Energy and Environment Technology KIST SchoolKorea University of Science and TechnologySeoul 02792Republic of Korea

NdFeB magnets are third-generation permanent magnets that are employed as indispensable components in various ***,rare-earth elements(REEs)such as Dy and Nd must be efficiently recovered from end-of-life magnets to enable resource circulation and reinforce unstable supply *** that end,this paper reports synergistically performing core/shell-structured composite fibers(CSCFs)containing sodium polyacrylate and nanoporous zeolitic imidazolate framework-8(NPZIF-8)nanocrystals as a readily recoverable adsorbent with an exceptional REE-adsorbing *** CSCF core forms an NPZIF-8 nanocrystal shell on the fiber surface as well as draws REEs using its dense sodium carboxylate groups into the NPZIF-8 nanocrystal lattice with high specific surface *** CSCFs exhibit significantly higher maximum adsorption capacities(468.60 and 435.13 mg·g-1)and kinetic rate constants(2.02 and 1.92 min-1)for the Nd3+and Dy3+REEs than those of previously reported REE ***,the simple application of the CSCFs to an adsorption reactor considerably mitigates the adsorbent-shape-induced pressure drop,thereby directly influencing the energy efficiency of the ***,the high REE-recovery ability,tractability,and recyclability of the CSCFs offers a pragmatic pathway to achieving cost-effective REE ***,this study provides new insights into designing synergistically performing core/shell architectures for feasible REE recovery.

关键词： Core/shell structures Fibrous adsorbents Synergistic adsorption Metal resource recovery Pressure drop Rare-earth elements

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Material Characterization of Ni Base Alloy for Very High Temperature Reactor

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Journal of Materials Science & Technology 2013年第12期29卷 1184-1190页

作者： Dong-Jin Kim Gyeong-Geun lee Dae Jong Kim su Jin Jeong Nuclear Materials Division Korea Atomic Energy Research Institute

The generation of highly efficient electricity and the production of massive hydrogen are possible using a very high temperature reactor （VHTR） among generation IV nuclear power plants. The structural material for an intermediate heat exchanger （IHX） among numerous components should be endurable at high temperature of up to 950 °C during long-term operation. Impurities inevitably introduced in helium as a coolant facilitate the material degradation by corrosion at high temperature. In the present work, the surface reactions available under controlled impure helium at 950 °C were investigated based on the thermodynamics and the corrosion tests were performed in a temperature range of 850-950 °C during 10-250 h for commercial Alloy 617 as a candidate material for an IHX. Moreover, the mechanical property and microstructure for nickel-based alloys fabricated in laboratory were evaluated as a function of the processing parameters such as hot rolling and heat treatment conditions. From the reaction rate constant obtained from an impure helium control system for a material evaluation, it was predicted that the outer oxide layer thickness, internal oxide depth, and carbide- depleted zone depth reach about 116, 600 and 1000 μm, respectively when Alloy 617 is exposed to an impure helium environment at 950 ~C for 20 years. For Ni-Cr-Co-Mo alloy, subsequent annealing and a combination of cold working and subsequent annealing following solution annealing caused increases in the grain boundary carbide coverage and size. The angular distribution of the grain boundary as well as the carbide distribution was also changed leading to a consequent improvement of the mechanical property at 950 °C in air.

关键词： Nickel base alloy Intermediate heat exchanger High temperature reactor Corrosion Mechanical property

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Fabrication of 3D Printed PCL/PEG Polyblend Scaffold Using Rapid Prototyping System for Bone Tissue Engineering Application

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Journal of Bionic Engineering 2018年第3期15卷 435-442页

作者： su A Park Sang Jin lee Ji Min Seok Jun Hee lee Wan Doo Kim Il Keun Kwon Department of Nature-Inspired Nanoconvergence Systems Korea Institute of Machinery and Materials 156 Gajeongbuk-ro Yuseong-gu Daejeon 34103 Republic of Korea Department of Dental Materials School of Dentistry Kyung Hee University 26 Kyungheedae-ro Dongdaemun-gu Seou102447 Republic of Korea

Three-dimensional （3D） printing is a novel process used to manufacture bone tissue engineered scaffolds. This process allows for easy control of the architecture at the micro structure. However, the scaffold properties are typically limited in terms of cellular activity at the scaffold surface due to the printed materials properties. In this study, we developed a polycaprolactone （PCL） blended with polyethylene glycol （PEG） 3D printed scaffold using a rapid prototyping system. The manufactured scaffolds were then washed out to form small pores on the surface in order to improve the scaffolds hydrophilicity. We analyzed the resultant material by using Scanning Electron Microscopy （SEM）, water absorption, water contact angle, in vitro WST-1, and the Bradford assay. Additionally, cells incubated on the fabricated scaffolds were visualized by Confocal Laser Scanning Microscopy （CLSM）. The developed scaffolds exhibited small pores on the strand surface which served to increase hydrophilicity as well as improve cellular proliferation and increase total protein content. Our findings suggest that the presence of small pores on the scaffolds can be used as an effective tool for improving implant cellular interaction. This research indicates that these modified scaffolds can be considered useful for bone tissue engineering applications to improve human health.

关键词： polycaprolactone polyethylene glycol polyblend 3D printing porosity bone tissue engineering

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Modulating charge carriers in carbon dots toward efficient solar-to-energy conversion

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Carbon Energy 2021年第4期3卷 590-614页

作者： Namhee Kim Jiyoung lee Minsu Gu Byeong-su Kim Department of Chemistry Yonsei UniversitySeoulRepublic of Korea Department of Chemical Engineering(BK21 FOUR) Dong-A UniversityBusanRepublic of Korea

Growing attention to the development of sustainable solar-to-energy conversion applications has resulted in the synthesis of promising and environment-friendly nanomaterials as energy *** various carbon nanomaterials,carbon dots(CDs)have received significant attention due to their excellent light absorption capability,broad absorption region,and superior photostability with enormous potential for solar energy ***,utilizing and modulating the charge carriers generated from CDs is critical for achieving a high energy conversion efficiency of ***,we focus on the distinct characteristics of CDs as energy converters from charge excitation to charge separation and transfer for various solar-to-energy applications,including photovoltaic cells,photocatalysts,and *** anticipate that this review will offer insight into the synthesis and design of novel nanocomposites with a fundamental analysis of the photochemical properties and future development of energy conversion devices.

关键词： carbon dots charge carrier energy conversion photocatalyst photoelectrocatalyst

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In situ observation of atomic movement in a ferroelectric film under an external electric field and stress

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Nano Research 2018年第7期11卷 3824-3832页

作者： Hyeon Jun lee Er-Jia Guo Taewon Min Seung Hyun Hwang su Yong lee Kathrin Dorr Jaekwang lee Ji Young Jo School of Materials Science and Engineering Gwangju Institute of Science and Technology Gwangju 61005 Republic of Korea Quantum Condensed Matter Division Oak Ridge National Laboratory Oak Ridge TN 37830 USA Institute for Physics Martin-Luther-University Halle-Wittenberg Halle 06099 Germany Department of Physics Pusan National University Busan 46241 Republic of Korea Pohang AccelerotorLaboratory Pohang 37673 Republic of Korea

Atomic movement under application of external stimuli （i.e., electric field or mechanical stress） in oxide materials has not been observed due to a lack of experimental methods but has been well known to determine the electric polarization. Here, we investigated atomic movement arising from the ferroelectric response of BiFeO3 thin films under the effect of an electric field and stress in real time using a combination of switching spectroscop）6 time-resolved X-ray microdiffraction, and in situ stress engineering. Under an electric field applied to a BiFeO3 film, the hysteresis loop of the reflected X-ray intensity was found to result from the opposing directions of displaced atoms between the up and down polarization states. An additional shift of atoms arising from the linearly increased dielectric component of the polarization in BiFeO3 was confirmed through gradual reduction of the diffracted X-ray intensity. The electric-field- induced displacement of oxygen atoms was found to be larger than that of Fe atom for both ferroelectric switching and increase of the polarization. The effect of external stress on the BiFeO3 thin film, which was controlled by applying an electric field to the highly piezoelectric substrate, showed smaller atomic shifts than for the case of applying an electric field to the film, despite the similar tetragonality.

关键词： in situ measurement atomic displacementunder electric field time-resolved X-ray microdiffraction ferroelectrics in situ strain engineering

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Redox sensor QSOX1 regulates plant immunity by targeting GSNOR to modulate ROS generation

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Molecular Plant 2021年第8期14卷 1312-1327页

作者： Ho Byoung Chae Min Gab Kim Chang Ho Kang Joung Hun Park Eun Seon lee Sang-Uk lee Yong Hun Chi Seol Ki Paeng su Bin Bae Seong Dong Wi byung-Wook Yun Woe-Yeon Kim Dae-Jin Yun David Mackey Sang Yeol lee Division of Applied Life Sciences(BK21)and PMBBRC Gyeongsang National UniversityJinju 52828Korea College of Pharmacy Research Institute of Pharmaceutical ScienceGyeongsang National UniversityJinju 52828Korea School of Applied Biosciences College of Agriculture and Life SciencesKyungpook National UniversityDaegu 41566Korea Department of Biomedical Science and Engineering Konkuk UniversitySeoul 05029Korea Department of Horticulture and Crop Science Department of Molecular Geneticsand Center for Applied Plant SciencesThe Ohio State UniversityColumbusOH 43210USA College of Life Sciences Qingdao Agricultural UniversityQingdao 266109P.R.China Plant Propagation Team Plant Production DivisionSejong National ArboretumSejong 30106Korea

Reactive oxygen signaling regulates numerous biological processes,including stress responses in *** sensors transduce reactive oxygen signals into cellular ***,we present biochemical evidence that a plant quiescin sulfhydryl oxidase homolog(QSOX1)is a redox sensor that negatively regulates plant immunity against a bacterial *** expression level of QSOX1 is inversely correlated with pathogen-induced reactive oxygen species(ROS)***,QSOX1 both senses and regulates ROS levels by interactingn with and mediating redox regulation of S-nitrosoglutathione reductase,which,consistent with previous findings,influences reactive nitrogen-mediated regulation of ROS ***,our data indicate that QSOX1 is a redox sensorthat negatively regulates plant immunity by linking reactive oxygen and reactive nitrogen signaling to limit ROS production.

关键词： redox sensor plant immu nity QSOX1 GSNOR reactive oxygen species(ROS) reactive nitrogen species(RNS)

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