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SOLIDIFICATION BEHAVIOR AND MICROSTRUCTURE EVOLUTION OF Si BEARING TiAl ALLOY

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中国有色金属学会会刊：英文版 1999年第S1期9卷 197-201页

作者： Fu Sheng Sun, Chunxiao Cao, Yafang Han and Minggao Yan Beijing Institute of Aeronautical Materials, P.O. Box 81, Beijing 100095, China Seung Eon Kim and Yong Tai Lee Korea Institute of Machinery & Materials, 66 Sangnam, changwon, Kyungnam, Korea

The solidification behavior of Ti 52 Al 48 x Si ( x =0, 0 5, 1 0, 2 0, 3 0, 6 0, mole fraction, %) alloys prepared by ingot metallurgy, has been studied with differential thermal analysis (DTA) and microstructure examination. Two kinds of Ti 5Si 3 phase were found in Ti 52 Al 48 x Si ( x =0 5, 1 0, 2 0) alloys. The first one was formed during L →Ti 5Si 3+ L 1, and the second one was characteristic of whiskers in eutectic morphology formed during L 2→α+Ti 5Si 3. The third kind of Ti 5Si 3 phase was formed in Ti 52 Al 48 3Si alloy by a eutectoid reaction of α→γ +Ti 5Si 3. With addition of Si up to 6 0 %, the solidification path was completely different from the other alloys.

关键词： TiAl alloys Si addition solidification behavior microstructure evolution

Optimization of a High Speed Spinning Disk Spindle System for Minimum RRO,NRRO,and Lightweight by Using G.A.

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厦门大学学报(自然科学版) 2002年第S1期41卷 89-90页

作者： Y H Choi S T Kim K C Yoon J M Kim Y J kang Dept.of Mechanical Design and Manufacturing Changwon National UniversityKyungnam 641-773Korea Dept.of Mechanical Engineering Changwon National UniversityKyungnam 641-773Korea Senoir Research Engineer R&D Cente FAGHANWHA Bearing Corp.Kyungnam 641-020Korea Graduate Student Dept.of Mechanical Design and ManufacturingChangwon National UniversityKyungnam 6412773Korea

Law level of RRO(Repeatable Run Out),NRRO(Non Repe at able Run Out),and lightweight construction are a major trend in the high-speed HDD(Hard Disk Drive)sytem to reduce track misregestration and to achieve high track density,which lead to succeed in the ***,it is not easy to r educe RRO,NRRO,and the weight of the spinning disk spindle system efficiently because lightweight construction and or bearing stiffness changes often yields a decrease in the static and dynamic stiffness of the system,and consequently hi gh vibrations may be generated as a ***,it is of importance to e valuate in advance the accurate dynamic behavior of the high speed spinning disk spindle system of a HDD *** study introduces an optimum design of the high speed spinning disk spindle system of a HDD for minimum RRO,NRRO,and lightweight construction using a gene tic *** spinning disk,hub,and bearing components of a HDD system ar e modelled as appropriate finite elements respectively and their equations of mo tion are derived to construct the system equations of the whole spinning disk sp indle system of the HDD *** RRO and NRRO responses of the spinning disk,due to exciting forces arised from ball bearing faults and rotating unbalance,are *** the design optimation,the hub thickness,the disk thickness,bearing positio ns(or bearing span)and bearing stiffness were set as design *** uni que objective function is obtained by multiplying an appropriate weighting facto r by multi-objective functions,such as RRO,NRRO,and the total weight of HDD the *** constraints are maximum RRO limit,maximum weight linit,and the critical speed limit of the HDD spindle *** show that the RRO,NRRO,and weight are reduced by 6%,66.7%and 28%r espectively compared with the initial design of the HDD ***,thi s present study can be used for an optimum design of the spinning disk spindle s ystem of a HDD for lightweight construction

关键词： design optimization genetic algorithm multiobjective optimization repeatable run out non repeatable run out

Occurrence of anionic redox with absence of full oxidation to Ru^(5+) in high-energy P2-type layered oxide cathode

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Journal of Energy Chemistry 2023年第9期84卷 153-161页

作者： Jinho Ahn Hyunyoung Park Wonseok Ko Yongseok Lee Jungmin kang Seokjin Lee Sangyeop Lee Eunji Sim Kyuwook Ihm Jihyun Hong Jung-Keun Yoo Kyojin Ku Jongsoon Kim Department of Energy Science Sungkyunkwan UniversitySuwon 16419Republic of Korea SKKU Institute of Energy Science and Technology(SIEST) Sungkyunkwan UniversitySuwon 16419Republic of Korea Nano&Interface Research Team Pohang Accelerator LaboratoryPohang 37673Republic of Korea Department of Smart Fabrication Technology Sungkyunkwan UniversitySuwon 16419Republic of Korea Energy Materials Research Center Korea Institute of Science and Technology(KIST)14 Gil 5 Hwarang-roSeongbuk-guSeoul 02792Republic of Korea Carbon Composites Department Composites Research DivisionKorea Institute of Materials Science(KIMS)797 ChangwondaeroChangwon 51508Republic of Korea Department of Materials Science and Engineering Hanbat National UniversityDaejeon 34158Republic of Korea

The anionic redox has been widely studied in layered-oxide-cathodes in attempts to achieve highenergy-density for Na-ion batteries(NIBs).It is known that an oxidation state of Mn^(4+) or Ru^(5+) is essential for the anionic reaction of O^(2-)/O~-to occur during Na^(+) de/***,here,we report that the anionic redox can occur in Ru-based layered-oxide-cathodes before full oxidation of Ru^(4+)/Ru^(5+).Combining studies using first-principles calculation and experimental techniques reveals that further Na^(+) deintercalation from P2-Na_(0.33)[Mg_(0.33)Ru_(0.67)]O_(2) is based on anionic oxidation after 0.33 mol Na^(+) deintercalation from P2-Na_(0.67)[Mg_(0.33)Ru_(0.67)]O_(2) with cationic oxidation of Ru^(4+)/Ru^(4.5+).Especially,it is revealed that the only oxygen neighboring 2Mg/1 Ru can participate in the anionic redox during Na^(+) de/intercalation,which implies that the Na-O-Mg arrangement in the P2-Na_(0.33)[M9_(0.33)Ru_(0.67)]O_(2) structure can dramatically lower the thermodynamic stability of the anionic redox than that of cationic *** the O anionic and Ru cationic reaction,P2-Na_(0.67)[Mg_(0.33)Ru_(0.67)]O_(2) exhibits not only a large specific capacity of~172 mA h g^(-1) but also excellent power-capability via facile Na^(+) diffusion and reversible structural change during charge/*** findings suggest a novel strategy that can increase the activity of anionic redox by modulating the local environment around oxygen to develop high-energy-density cathode materials for NIBs.

关键词： Na-ion batteries P2-type cathode Anionic redox Local environment First-principles calculation

Fabrication of high-strength duplex nanoporous Cu by dealloying a dual-phase Mg-Cu precursor alloy

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Journal of Magnesium and Alloys 2020年第3期8卷 910-916页

作者： Si-Young Lee Soo-Min Baek Eun-Ji Gwak Na-Ri kang Ju-Young Kim Su-Hyeon Kim Jung Gu Lee Sung Soo Park School of Materials Science and Engineering Ulsan National Institute of Science and TechnologyUlsan 44919Republic of Korea Korea Institute of Materials Science Changwon 51508Republic of Korea School of Materials Science and Engineering University of UlsanUlsan 44610Republic of Korea

Duplex nanoporous Cu was successfully fabricated by dealloying a dual-phase Mg-Cu precursor alloy consisting of intermetallic Mg2Cu and *** duplex nanoporous Cu with embedded nanoporous struts exhibited highly enhanced strength compared to the typical monolithic nanoporous Cu under both compressive and flexural test conditions at room temperature;the duplex np-Cu sample exhibited a 12 times higher compressive strength and a 40 times greater flexural strength than the monolithic np-Cu *** responsible for the strength enhancement in the duplex nanoporous Cu are discussed.

关键词： Mg-Cu alloy Nanoporous Cu Dealloying Duplex structure Strength

T/myeloid mixed-phenotype acute leukemia treated with venetoclax and decitabine:A case report

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World Journal of Clinical Cases 2023年第26期11卷 6200-6205页

作者： Sungwoo Park Eun Jeong Jeong Jung Hun kang Gyeong-Won Lee Se-Il Go Dong-Hyun Lee Eun-Ha Koh Division of Hematology and Oncology Department of Internal MedicineGyeongsang National University HospitalGyeongsang National University School of MedicineGyeongsang National UniversityJinju 52727South Korea Department of Internal Medicine Institute of Health SciencesGyeongsang National University Changwon HospitalGyeongsang National University School of MedicineChangwon 52828South Korea Department of Laboratory Medicine Gyeongsang National University HospitalGyeongsang National University School of MedicineGyeongsang National UniversityJinju 52828South Korea

BACKGROUND Mixed-phenotype acute leukemia(MPAL)is characterized by acute undifferentiated leukemia with blasts co-expressing myeloid and lymphoid ***,consensus regarding the ideal management strategy for MPAL is yet to be established,owing to its *** SUMMARY A 55-year-old male was diagnosed with T/myeloid ***,prednisolone,daunorubicin,and L-asparaginase were administered as induction *** shock occurred 10 days after induction,and bone marrow examination following recovery from sepsis revealed refractory *** and decitabine were administered as chemotherapy-free induction therapy to reduce the infection *** were no serious infections,including febrile neutropenia,at the end of the *** receiving two additional cycles of venetoclax/decitabine,the patient underwent haploidentical peripheral blood stem-cell transplantation and achieved complete response(CR)to *** CR was maintained in a patient with MPAL who underwent haploidentical peripheral blood stem-cell transplantation after additional venetoclax/decitabine cycles.

关键词： Mixed-phenotype acute leukemia Venetoclax Decitabine Case report

A flexible electromagnetic interference shielding film coated with a hybrid solder-magnetic powder mixture on a PET substrate

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Journal of Materiomics 2018年第4期4卷 390-401页

作者： Jae Hyang Lee Dong Seok kang Sang Hoon Kim Min-Jung Son Jae Won Choi Dae Keun Choi Joon-Phil Choi Clodualdo Aranas Jr Metal 3D Printing Convergence Research Team Korea Institute of Machinery and Materials156 Gajeongbuk-roYuseong-guDaejeon34103Republic of Korea Metal Powder Department Korea Institute of Materials Science797 Changwon-daeroSeongsan-guChangwon-siGyeongsangnam-do51508Republic of Korea Digital Manufacturing Process Group Korea Institute of Industrial Technology113e58 Seohaean-roSiheung-siGyeonggi-do15014Republic of Korea Department of Printed Electronics Korea Institute of Machinery and Materials156 Gajeongbuk-roYuseong-guDaejeon34103Republic of Korea Department of Mining and Materials Engineering McGill University3610 University StreetMontrealQuebecH3A 0C5Canada Mechanical Engineering University of New Brunswick15 Dineen DriveFrederictonNew BrunswickE3B 5A3Canada

A flexible electromagnetic interference(EMI)shielding film was innovatively fabricated using both low melting temperature solder arrays and amorphous soft magnet particulates consolidated on a polyethylene terephthalate(PET)***,the IneSneBi solder arrays presented a low melting point of 99.4C,which enabled attachment to the heat-sensitive plastic substrate without any thermal damage,and a low electrical resistivity of 14.1 mU cm,making them very effective at interrupting EM ***,the solder arrays with a high thermal conductivity of 61.2 W/(m$K)at 298.15 K were also useful as a thermal conductor for a heat ***,the solder arrays provide efficient electrical and thermal channels for electron transport induced by abruptly or consistently created EM waves due to suddenly turning on and the long term operation of electronics,***,the Fe-based magnetic particulates were added and resulted in effective saturation magnetization of 161.1 emu/g,remanence of 2.9 emu/g,and coercivity of 12.5 G,thus were able to disturb the EM pathway because of their soft magnetic ***,the hybrid EMI shielding film with exceptionally high electrical and thermal conductivity and superior soft magnetic properties provided remarkable shielding effectiveness of 102.5 dB at 10.2 GHz.

关键词： Flexible EMI shielding film PET substrate Solder arrays Magnetic particulates

Effect of SMAD7 gene overexpression on TGF-β1-induced profibrotic responses in fibroblasts derived from Peyronie＇s plaque

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Asian Journal of Andrology 2015年第3期17卷 487-492页

作者： Min Ji Choi kang-Moon Song Jin-Mi Park Mi-Hye Kwon Ki-Dong Kwon Soo-Hwan Park Dong-Soo Ryu Ji-Kan Ryu Jun-Kyu Suh Department of Urology National Research Center for Sexual Medicine Inha University School of Medicine Incheon 400-711 Korea Department of Urology Changwon Samsung Medical Center Changwon 630-522 Korea Inha Research Institute for Medical Sciences Inha University School of Medicine Incheon 400-711 Korea

Transforming growth factor-β1 （TGF-β1） has been identified as one of the most important fibrogenic cytokines associated with Peyronie＇s disease （PD）. The mothers against decapentaplegic homolog 7 （SMAD7） is an inhibitory Smad protein that blocks TGF-J3 signaling pathway. The aim of this study was to examine the anti-fibrotic effect of the SMAD7 gene in primary fibroblasts derived from human PD plaques. PD fibroblasts were pretreated with the SMAD7 gene and then stimulated with TGF-β1. Treated fibroblasts were used for Western blotting, fluorescent immunocytochemistry, hydroxyproline determination, and terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate nick-end labeling assays. Overexpression of the SMAD7 gene inhibited TGF-β1-induced phosphorylation and nuclear translocation of SMAD2 and SMAD3, transdifferentiation of fibroblasts into myofibroblasts, and quashed TGF-β1-induced production of extracellular matrix protein and hydroxyproline. Overexpression of the SMAD7 gene decreased the expression of cyclin D1 （a positive cell cycle regulator） and induced the expression of poly （ADP-ribose） polymerase 1, which is known to terminate Smad-mediated transcription, in PD fibroblasts. These findings suggest that the blocking of the TGF-β pathway by use of SMAD7 may be a promising therapeutic strategy for the treatment of PD.

关键词： cell culture decapentaplegic homolog 7 fibrosis Peyronie's disease transforming growth factor-beta

Transparent high-performance piezoceramics through pressureless sintering

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Journal of Advanced Ceramics 2024年第5期13卷 561-567页

作者： Hye-Lim Yu Woo-Seok kang Ju-Hyeon Lee Temesgen Tadeyos Zate Young-Jin Lee Bo-Kun Koo Dong-Jin Shin Min-Soo Kim Soon-Jong Jeong Young Ghyu Ahn Wook Jo Department of Material Science and Engineering Ulsan National Institute of Science and TechnologyUlsan 44919Republic of Korea Energy Conversion Research Center Korea Electrotechnology Research InstituteChangwon 51543Republic of Korea MLCC Development Team Component Biz.UnitSamsung Electro-Mechanics Co.Ltd.Suwon 16674Republic of Korea

Piezoelectricity offers an electromechanical coupling that is widely utilized in transducer *** has been a consistent demand for transparent piezoelectric materials for optoelectrical ***,despite the inherent tradeoff between the transparency and the piezoelectricity,numerous strategies have been explored to develop the transparent piezoelectric ***,the most transparent piezoelectric materials developed to date is either a single crystal or materials that achieve transparency via hot-press sintering,limiting its industrial ***,we introduce a novel piezoelectric material that ensures transparency through co-doping and pressureless sintering of polycrystalline *** this study,we employed a compositional optimization approach to enhance the synergistic effect between the transparency and the piezoelectric properties of 0.71Pb(Mg_(1/3)Nb_(2/3))O_(3)–0.29PbTiO_(3)(PMN–0.29PT)*** utilizing the tape casting process for mass production and large-area manufacturing,our Pb_(0.913)La_(0.0145)Sm_(0.0145)(Mg_(1/3)Nb_(2/3))_(0.71)Ti_(0.29)O_(3)(TP2.9)ceramics exhibited over 60%transparency and large piezoelectric coefficient(d33)of 1104 pC/*** material holds considerable promise for a wide range of industrial applications in both the optical and electronic domains.

关键词： piezoelectric ceramics transparency pressureless sintering co-doping tape casting

Functionally Graded Ti-50.5Ni Alloy

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材料科学与工程学报 2007年第6期25卷 917-921页

作者： Hyun-Gon Kim Ju-Young Choi Jung-Moo Lee Cha-Yong Lim Suk-Bong kang Yinong Liu Tae-Hyun Nam Division of Advanced Materials Engineering i-cube center and ERIGyeongsang National University900 Gajwa-dongJinjuGyeongnam 660-701Korea Advanced Materials Research Division Korean Institute of Machinery and Materials66 Sangnam-dongChangwon 641-831Korea Department of Mechanical Engineering University of Western AustraliaCrawleyWA 6009Australia

Transformation behavior and shape memory characteristics of a temperature gradient annealing(TGA)treated Ti-50.5Ni(at%)alloy have been investigated by means of differential scanning calorimetry(DSC)and thermal cycling tests under constant *** annealing the specimen under the temperature gradient from 823 K to 658 K after solution treatment,the B19' martensitic transformation start temperature changed by 60 K along the length of sample(150mm).Temperature dependence of transformation elongation(dε/dT)of the TGA treated wire was found to be 0.16 %/*** annealing the specimen under the temperature gradient from 823 K to 658 K after 47 % cold working without solution treatment,the B19' martensitic transformation start temperature changed by 61K along the length of sample(150mm).Temperature dependence of transformation elongation(dε/dT)of the TGA treated wire was found to be 0.04 %/*** large decrease in dε/dT by cold working effect suggested that an introduction of dislocation was more effective than precipitates for lowering dε/dT.

关键词：钛镍合金位错温度延长性能温度梯度退火处理