检索结果-南通市图书馆

Effects of TiC on the microstructure refinement and mechanical property enhancement of additive manufactured Inconel 625/TiC metal matrix composites fabricated with novel core-shell composite powder

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第33期164卷 13-26页

作者： Taegyu Lee Wonjong jeong SeungHyeok Chung ho jin Ryu Department of Materials Science and Engineering Korea Advanced Institute of Science and TechnologyYu Seong-GuDae Hak-Ro 29134141 DaejeonRepublic of Korea Department of Nuclear and Quantum Engineering Korea Advanced Institute of Science and TechnologyYu Seong-GuDae Hak-Ro 29134141 DaejeonRepublic of Korea

The flexible product shape of additive manufacturing(AM)is attractive,but the process suffers from a lack of material property diversity due to a limited number of printable alloys and post-processing *** overcome this problem,the AM of metal matrix composites(MMCs)is a highly suitable solution because the properties of MMC can be tailored using various ***,extensive research has been conducted on the AM of MMCs;however,the major huddle for this process has been the difficulties in preparing feedstock powder and operating the AM *** study introduces an easily synthesizable core-shell composite powder,which was fabricated by a recently developed process called the SMART *** core-shell powder has a novel morphology,consisting of a metal core and composite shell,distinguishing it from the powders used in conventional AM *** 625/TiCp composites were fabricated using the core-shell composite powder,with various fractions of TiCp up to 10 vol.%.Compared to additive-manufactured Inconel 625,the additive-manufactured MMCs showed enhanced strength with significantly fewer *** results of this study may accelerate the application of MMC fabricated by AM,which offers superior properties and reliability compared to casting and powder metallurgy due to the higher degree of dislocation density and reinforcement dispersion.

关键词： Powder treatment Composite powder Metal matrix composite Additive manufacturing Nickel-based superalloy Directed energy deposition

Attaching single carbon nanotube on tip's apex using dielectrophoresis of DC-pulse voltage

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2009年第B09期19卷 280-283页

作者： Hee-jin jeong Yoong-ho JUNG Deug-Woo LEE Gyeongbuk Hybrid Technology Institute School of Mechanical Engineering Pusan National University Department of Nanosystem and Nanoprocess Engineering Pusan National University

Single carbon nanotubes (CNTs) are candidates for a number of electronics and sensing applications, provided that single CNTs can be separated from a bundle of CNTs in suspension. Dielectrophoresis has recently been demonstrated as one route for the extraction of desired CNTs. however, previous methods using dielectrophoresis have found it difficult to extract single nanotubes from bundles of CNTs in solution. Here, we show that this restriction can be overcome by using pulsed DC voltage of an electric field, instead of regular AC and DC voltages.

关键词：碳纳米管直流脉冲脉冲电压介电顶点消息电子号码 CNTs

Naphthalene emissions from moth repellents or toilet deodorant blocks determined using head-space and small-chamber tests

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2008年第8期20卷 1012-1017页

作者： JO Wan-Kuen LEE Jong-Hyo LIM ho-jin jeong Woo-Sik Department of Environmental Engineering Kyungpook National UniversityDaegu 702-701Korea. School of Food and Life Science Inje University KimhaeKyungsangnarado 621-749Korea

The present study investigated the emissions of naphthalene and other compounds from several different moth repellents(MRs) and one toilet deodorant block(TDB)currently sold in Korea,using a headspace *** emission factors and emission rates of naphthalene were studied using a small-scale environmental ***-type products emitted a higher concentration of the total volatile organic compounds(VOCs)(normalized to the weight of test piece)than ball-type products,which in turn emitted higher con...

关键词： volatile organic compounds(VOCs) chemical composition ball-type gel-type paper-type

High-temperature Oxidation Behavior of Zircaloy-4 and Zirlo in Steam Ambient

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2010年第9期26卷 827-832页

作者： Hyung hoon Kim Jun ho Kim jin Young Moon ho Seong Lee jeong Joo Kim Young Suck Chai School of Materials Science and Engineering Kyungpook National University School of Mechanical Engineering Yeungnam University214-1 Dae-dongGyeongsan-si

The oxidation characteristics for Zircaloy-4 and Zirlo in the temperature range of 700-1200°C under steam supply condition were investigated by using a modified thermo-gravimetric *** specimens were oxidized for 3600 s at each temperature and then quenched in a *** oxidation rate constants were measured from the weight gains to evaluate the oxidation behavior in Zircaloy-4 and *** weight gain rates of Zirlo were lower than those of Zircaloy-4,leading to the low rate *** different oxidation behaviors between both cladding materials were considered to be due to the difference in their chemical compositions.

关键词： Zircaloy-4 Zirlo Oxidation

The modulation of radiation-induced cell death by genistein in K562 cells:Activation of thymidine kinase 1

在线全文

学校读者我要写书评

暂无评论

Cell Research 2004年第4期14卷 295-302页

作者： Min ho jeong,Young Hee jin,Eun Young KANG,Wol Soon JO,Hwan Tae PARK,Jae Dong LEE,Yeo jin YOO,Soo jin jeong Research Supporting Center for Medical Science (BK21 program) Dong-A University College of Medicine Busan Korea Research Supporting Center for Medical Science (BK21 program) Dong-A University College of Medicine Busan Korea Research Supporting Center for Medical Science (BK21 program) Dong-A University College of Medicine Busan Korea Research Supporting Center for Medical Science (BK21 program) Dong-A University College of Medicine Busan Korea Research Supporting Center for Medical Science (BK21 program) Dong-A University College of Medicine Busan Korea Department of Microbiology Pusan National University Busan Korea Research Supporting Center for Medical Science (BK21 program) Dong-A University College of Medicine Busan Korea Research Supporting Center for Medical Science (BK21 program) Dong-A University College of Medicine Busan Korea Virus Tumor Biology Section Laboratory of Cellular Oncology Center for Cancer Research National Cancer Institutes National Institute of Health Bethesda MD 20892 USA

Ionizing radiation is one of the most effective tools in cancer therapy. In a previous study, we reported that protein tyrosine kinase (PTK) inhibitors modulate the radiation responses in the human chronic myelogenous leukemia (CML) cell line K562. The receptor tyrosine kinase inhibitor, genistein, delayed radiation-induced cell death, while non-recepter tyrosine kinase inhibitor, herbimycin A (HMA) enhances radiation-induced apoptosis. In this study, we focused on the modulation of radiation-induced cell death by genistein and performed PCR-select suppression subtractive hybridization (SSH) to understand its molecular mechanism. We identified human thymidine kinase 1 (TK1), which is cell cycle regulatory gene and confirmed expression of TK1 mRNA by Northern blot analysis. Expression of TKl mRNA and TK1 enzymatic activity were parallel in their increase and decrease. TK1 is involved in G1-S phase transition of cell cycle progression. In cell cycle analysis, we showed that radiation induced G2 arrest in K

关键词： K562 radiation cell death genistein thymidine kinase 1 cell cycle.

Optic radiation injury in patients with aneurismal subarachnoid hemorrhage: a preliminary diffusion tensor imaging report

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2018年第3期13卷 563-566页

作者： Sung ho Jang Chul hoon Chang Young jin Jung Seong ho Kim jeong Pyo Seo Department of Physical Medicine and Rehabilitation College of Medicine Yeungnam University Department of Neurosurgery College of Medicine Yeungnam University

Visual field defect is one of the various clinical manifestations in patients with subarachnoid hemorrhage（SAH）. Little is known about the pathogenic mechanism of visual field defect in SAH. In the current study,we investigated the diffusion tensor imaging （DTI） finding of the optic radiation in patients with SAH followingrupture of a cerebral artery aneurysm. We recruited 21 patients with aneurismal SAH （12 males, 9 females, mean age, 52.67 years; range, 41–68 years） who showed no definite lesion along the visual ***-one age-and sex-matched normal control subjects were also recruited. DTI data were acquired at an average of 5.9 weeks （range： 3–12 weeks） after onset and reconstruction of the optic radiation was performed using DTI-Studio software. The fractional anisotropy value, apparent diffusion coefficient value,and fiber number of the optic radiation were measured. The fractional anisotropy value of the optic radiation was significantly decreased, and the apparent diffusion coefficient value was significantly increased, in patients with aneurismal SAH than in normal control subjects. however, there was no significant difference in the fiber number of the optic radiation between patients with aneurismal SAH and normal control subjects. The decrement of fractional anisotropy value and increment of apparent diffusion coefficient value of the optic radiation in patients with aneurismal SAH suggest optic radiation injury. Therefore, we recommend a thorough evaluation for optic radiation injury in patient with aneurismal SAH.

关键词： nerve regeneration diffusion tensor imaging optic radiation subarachnoid hemorrhage visual field defect neural regeneration

Aqueous-processable,naphthalene diimide-based polymers for eco-friendly fabrication of high-performance,n-type organic electrolyte-gated transistors

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2022年第5期65卷 973-978页

作者： Dahyun jeong Min Je Kim Seungjin Lee jin-Woo Lee Youngwoong Kim Hyeong Jun Kim jeong ho Cho Bumjoon J.Kim Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Department of Chemical and Biomolecular Engineering Yonsei UniversitySeoul 03722Republic of Korea Department of Chemical and Biomolecular Engineering Sogang UniversitySeoul 04107Republic of Korea

Organic electrolyte-gated transistors(OEGTs) have the benefits of low power consumption and large current ***,the electrical performance of n-type OEGTs lags far behind that of p-type *** this study,we design a series of polymers,P(NDITEG-T) and P(NDIMTEG-T),comprising a naphthalene diimide backbone for n-type charge transport and oligo(ethylene glycol)(OEG) side chains for high ionic conductivity and eco-friendly solution *** incorporation of the OEG chain facilitates the electrochemical doping of the semiconductor by ions to realize high-performance,n-type ***,in OEGTs,P(NDITEG-T) achieves a high electron mobility of 1.0 × 10^(-1) cm^(2) V^(-1) s^(-1),which represents the highest value reported for solution-processed,n-type *** is noted that the fabrication of the OEGTs is achieved by solution processing with eco-friendly ethanol/water mixtures in virtue of the hydrophilic OEG *** work demonstrates the molecular design of the P(NDITEG-T) polymer and its significant ability to produce aqueous-processable,high-performance,and n-type OEGTs.

关键词： organic electrolyte-gated transistors n-type transistors oligo(ethylene glycol)polymers eco-friendly solution process high electron mobility

Plasma Post Oxidation of Plasma Nitrocarburized SKD 61 Steel

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2008年第1期24卷 136-138页

作者： Insup Lee Kwang-ho jeong Department of Advanced Materials Engineering Dongeui University Busan 614-714 Korea

Plasma nitrocarburizing and plasma oxidizing treatments were performed to improve the wear and corrosion resistance of SKD 61 *** nitrocarburizing was conducted for 12 h at 540℃in the nitrogen, hydrogen and methane atmosphere to produce theε-Fe-（2-3）（N,C） *** compound layer produced by plasma nitrocarburising was predominantly composed ofε-phase,with a small proportion ofγ′-Fe-4 （N,C） phase. The thickness of the compound layer and the diffusion layer are about 10μm and about 200μm,respectively. Plasma post oxidation was performed on the nitrocarburized samples with various oxygen/hydrogen ratio at constant temperature of 500℃for 1 *** very thin magnetite （Fe-3O-4） layer of 1-2μm in thickness on top of the compound layer was *** polarization test revealed that plasma nitrocarburizing process contributed a significant improvement of corrosion resistance of SKD 61 ***,the corrosion characteristics of the nitrocarburized compound layer was deteriorated by oxidation treatment.

关键词： Plasma nitrocarburizing Post oxidation ε-Fe2-3(N,C) γ′-Fe4(N,C) Fe3O4

Electrochemical and structural evolution of structured V_(2)O_(5) microspheres during Li-ion intercalation

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2021年第4期30卷 108-113页

作者： Sul Ki Park Puritut Nakhanivej jeong Seok Yeon Kang ho Shin Wesley M.Dose Michael De Voider jin Bae Lee Hae jin Kim ho Seok Park School of Chemical Engineering Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746South Korea Institute for Manufacturing Department of EngineeringUniversity of CambridgeCambridge CB30FSUnited Kingdom Department of Chemistry University of CambridgeLensfield RoadCambridge CB21EWUnited Kingdom Research Center for Materials Analysis Korea Basic Science InstituteDaejeonRepublic of Korea SKKU Advanced Institute of Nano Technology(SAINT) Sungkyunkwan University2066SeoburoJangan-guSuwon440-746South Korea Department of Health Sciences and Technology Samsung Advanced Institute for Health Sciences and Technology(SAIHST)Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746South Korea

With the development of stable alkali metal anodes,V_(2)O_(5) is gaining traction as a cathode material due to its high theoretical capacity and the ability to intercalate Li,Na and K ***,we report a method for synthesizing structured orthorhombic V_(2)O_(5) microspheres and investigate Li intercalation/deintercalation into this *** industry adoption,the electrochemical behavior of V_(2)O_(5) as well as structural and phase transformation attributing to Li intercalation reaction must be further *** synthesized V_(2)O_(5) microspheres consisted of small primary particles that were strongly joined together and exhibited good cycle stability and rate capability,triggered by reversible volume change and rapid Li ion *** addition,the reversibility of phase transformation(a,e,d,c and xLixV_(2)O_(5))and valence state evolution(5+,4+,and 3.5+)during intercalation/de-intercalation were studied via in-situ X-ray powder diffraction and X-ray absorption near edge structure analyses.

关键词： Lithium ion batteries Vanadium pentoxide(V2O5) In-situ analysis Phase transformation Intercalation/de-intercalation