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Use of various MgO resources for high-purity Mg metal production through molten salt electrolysis and vacuum distillation

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Journal of Magnesium and Alloys 2023年第2期11卷 562-579页

作者： Hyeong-Jun Jeoung tae-Hyuk Lee youngjae Kim Jin-young Lee young Min Kim Toru HOkabe Kyung-Woo Yi Jungshin Kang Korea Institute of Geoscience and Mineral Resources 124 Gwahak-ro Yuseong-guDaejeon 34132South Korea Department of Materials Science and Engineering Seoul National University1 Gwanak-roGwanak-guSeoul 08826South Korea Department of Resources Engineering University of Science and Technology217 Gajeong-ro Yuseong-guDaejeon 34113South Korea Korea Institute of Materials Science 797 Changwondae-roSeongsan-guChangwonGyeongnam 51508South Korea Institute of Industrial Science The University of Tokyo4-6-1 KomabaMeguro-kuTokyo 153-8505Japan School of Materials Science and Engineering Pusan National University2 Busandaehak-roGeumjeong-guBusan 44241South Korea

A green and effective electrolytic process was developed to produce high-purity Mg metal using primary and secondary resources containing Mg O as a feedstock. The electrolysis of various Mg O resources was conducted using a Cu cathode in MgF2– LiF – KCl molten salt at 1043 K by applying an average current of 1.44 A for 12.5 h. The electrolysis of calcined North Korean magnesite and seawater Mg O clinker yielded Mg alloys of MgCu2and(Cu) phases with current efficiencies of 89.6–92.4%. The electrolysis of oxidized Mg O-C refractory brick, aged ferronickel slag, and ferronickel slag yielded Mg alloys of MgCu2and(Cu) phases with current efficiencies of 59.3–92.3%. The vacuum distillation of Mg alloys obtained was conducted at 1300 K for 10 h to produce high-purity Mg metal. After vacuum distillation, Mg metal with a purity of above 99.994% was obtained. Therefore, this study demonstrates the feasibility of the production of high-purity Mg metal from various Mg O resources using a novel electrolytic process with a Cu cathode, followed by vacuum distillation.

关键词： High-purity magnesium Magnesium oxide resources Electrolytic process Metal cathode Vacuum distillation

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Utilization of nano/micro-size iron recovered from the fine fraction of automobile shredder residue for phenol degradation in water

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Frontiers of Environmental Science & Engineering 2016年第4期10卷 53-59页

作者： Jiwan SINGH yoon-young CHANG Jae-Kyu YANG Seon-Hong KANG Janardhan Reddy KODURU Department of Environmental Engineering Kwangwoon University Seoul 139-701 Republic of Korea Division of General Education Kwangwoon University Seoul 139-701 Republic of Korea Graduate School of Environmental S~dies Kwangwoon university Seoul 139-701 Republic of Korea

The study investigates the magnetic separation of Fe from automobile shredder residue （ASR）（〈 0.25 mm） and its application for phenol degradation in water. The magnetically separated Fe was subjected to an ultrasonically assisted acid treatment, and the degradation of phenol in an aqueous solution using nano/micro-size Fe （n/m Fe） was investigated in an effort to evaluate the possibility of utilizing n/m Fe to remove phenol from wastewater. The prepared n/m Fe was analyzed by scanning electron microscopy （SEM） and Fourier transform infrared spectroscopy （FTIR）. The eflects of the dosages ot n/mFe, pH, concentration of phenol and amount of H2O2 on phenol removal were evaluated. The results confirm that the phenol degradation rate was improved with an increase in the dosages of n/mFe and H2O2; however, the rate is reduced when the phenol concentration is higher. The degradation of phenol by n/mFe followed the pseudo-first-order kinetics. The value of the reaction rate constant （k）was increased as the amounts of n/m Fe and H2O2 increased. Conversely, the value of k was reduced when the concentration of phenol was increased. The probable mechanism behind the degradation of phenol by n/m Fe is the oxidation of phenol through hydroxyl radicals which are produced during the reaction between H2O2 and n/m Fe.

关键词： Automobile shredder residue (ASR)Fe Phenol Scanning electron microscopy (SEM) andFourier transform infrared spectroscopy(FTIR)Mechanism

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Refractive errors in high myopic eyes after phacovitrectomy for macular hole

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International Journal of Ophthalmology(English edition) 2015年第2期8卷 369-373页

作者： Donghyun Jee Yi-Ryeung Park Kyoung In Jung Eunchul Kim tae yoon La Department of Ophthalmology and Visual Science College of Medicine Catholic University of Korea St. Vincent Hospital Department of Ophthalmology and Visual Science College of Medicine Catholic University of Korea Seoul St. Mary's Hospital Department of Ophthalmology and Visual Science College of Medicine Catholic University of Korea Bucheon St.Mary's Hospital

AIM: To examine the refractive prediction error in high myopic eyes after ***: This retrospective comparative case series included 91 eyes(18 high myopic eyes and 73 non-high myopic eyes) of 91 patients who underwent successful phacovitrectomy(phacoemulsification, intraocular lens implantation, and pars plana vitrectomy). The high myopic eyes were defined as the eye with more than 26.0mm of axial length. The postoperative prediction error of mean error and mean absolute error were evaluated at4 mo postoperatively. Axial length and keratometry measurement were performed preoperatively and 4mo postoperatively using the IOL ***: The refractive outcome after phacovitrectomy showed significantly greater myopic shift in the high myopic eyes [-1.08 ±0.87 diopters(D)] than that in the non-high myopic eyes(-0.43 ±0.63 D, P =0.004). Axial length and keratometric value in the high myopic eyes were significantly increased(P =0.043, 0.037 respectively),whereas those in the non-high myopic group were not significantly increased(P =0.135, 0.347 respectively). The change of the axial length in the myopic eye(0.46±0.28 mm)was greater than that in the non- high myopic eye(0.11 ± 0.34 mm; P <0.001).CONCLUSION: High myopic eyes showed more myopic shift than non-high myopic eyes after *** cause of myopic shift in high myopic eyes seems tobe attributed to actual elongation of the axial length in high myopia.

关键词： axial length high myopic eyes keratometry phacovitrectomy refractive errors

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Clinical significance of the leptin and leptin receptor expressions in prostate tissues

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Asian Journal of Andrology 2008年第6期10卷 923-928页

作者： Jung Hoon Kim Shin young Lee Soon Chul Myung young Sun Kim tae-Hyoung Kim Mi Kyung Kim Departments of Urology College of Medicine Chung-Ang University Seoul 140-757 Korea Departments of Pathology College of Medicine Chung-Ang University Seoul 140-757 Korea

Aim： To evaluate the expression of leptin and leptin receptor in benign prostatic hyperplasia （BPH） and prostate cancer （PCa）, and to investigate whether they are associated with the development and progression of PCa. Methods： hnmunohistochemical staining was performed to examine the expression of leptin and leptin receptor in BPH and PCa. PCa was divided into three groups： localized PCa, locally advanced PCa and metastatic PCa. The positive staining was identified and the percentage of the positive staining was graded. We also assessed the relationship between both the Gleason score and body mass index （BMI） and PCa. Results： The percentage of the leptin expression in PCa was significantly higher than that in BPH （P 〈 0.01）. For the PCa group, the expressed levels of leptin showed a considerable correlation with localized PCa and metastatic PCa （P 〈 0.05）. Leptin receptor, however, did not reveal a definite difference between BPH and PCa. The expression of leptin indicated a significant difference between well-differentiated PCa （Gleason score ≤6） and poorly differentiated PCa （Gleason score 8-10）（P 〈 0.05）. The relation between the leptin expression level in PCa and the BMI was not remarkable （P = 0.447）. Conclusion： Our results suggest that leptin might have a promoting effect on the carcinogenesis and progression of PCa.

关键词： leptin leptin receptor prostatic neoplasms

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Microforming of superplastic 5083 aluminum alloy

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中国有色金属学会会刊：英文版 2012年第S3期22卷 656-660页

作者： Md.Abu Mowazzem HOSSAIN Sung-tae HONG Kyu-Yeol PARK young-Sang NA School of Mechanical Engineering University of Ulsan Korea Institute of Materials Science

The mechanical behavior of superplastic 5083 aluminum alloy during microforming process was investigated by finite element analysis.A micro V-groove die was modeled to analyze the effects of forming time,load and temperature on the microformability of the 5083 aluminum ***,the microformability of the 5083 aluminum alloy was estimated using a microformability *** simulation results show that the microformability increases with the forming load,time and temperature *** of the 5083 aluminum alloy during microforming using the V-groove die was also investigated in terms of the effective strain *** results show that the superplasticity of the 5083 aluminum alloy occurs in a specific part of the material for a specific period during the microforming process depending on the forming conditions and the microformability index.

关键词： microforming superplasticity 5083 aluminum alloy

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Multidimensional Hybrid Architecture Encapsulating Cobalt Oxide Nanoparticles into Carbon Nanotube Branched Nitrogen-Doped Reduced Graphene Oxide Networks for Lithium–Sulfur Batteries

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Energy & Environmental Materials 2022年第2期5卷 555-564页

作者： Jeong Seok Yeon young Hun Ko tae Ho Park Hyunyoung Park Jongsoon Kim Ho Seok Park School of Chemical Engineering College of EngineeringSungkyunkwan University2066Seobu-roJangan-guSuwon-si Gyeonggi-do 440-746Korea Advanced Batteries Research Center Korea Electronics Technology Institute25Saenari-roBundang-guSeongnam-si Gyeonggi-do 13509Korea Department of Energy Science Sungkyunkwan University2066Seobu-roJangan-guSuwon-si Gyeonggi-do 440-746Korea Department of Health Sciences and Technology Samsung Advanced Institute for Health Sciences and Technology(SAIHST)Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746South Korea

Lithium–sulfur batteries(LSBs)are regarded as promising candidates for the next-generation energy storage devices owing to their high-theoretical capacity(1675 mAh g^(−1))and affordable ***,several limitations of LSBs such as the lithium polysulfide shuttle,large volume expansion,and low electrical conductivity of sulfur need to be resolved for practical *** address these limitations,herein,a multidimensional architectured hybrid(Co@CNT/nG),where Co_(3)O_(4) nanoparticles are encapsulated into threedimensional(3D)porous N-doped reduced graphene oxide interconnected with carbon nanotube(CNT)branches,is synthesized through a simple pyrolysis *** synergistic effect achieved through the homogeneously distributed and encapsulated Co_(3)O_(4) nanoparticles,the interconnected CNT branches,and the 3D hierarchical porous structure and N-doping of Co@CNT/nG significantly suppresses the shuttle effect of lithium polysulfides and enhances the conversion redox kinetics for the improved sulfur *** validate this effect through various measurements including symmetric cells,Li_(2)S nucleation,shuttle currents,Tafel slopes,diffusion coefficients,and post-mortem ***,Co@CNT/nG-70S-based LSB cells achieve a high-specific capacity of 1193.1 mAh g^(−1) at 0.1 C and a low capacity decay rate of 0.030%per cycle for 700 cycles at 5 C,delivering a high areal capacity of 5.62 mAh cm^(−2) even with a loading of 6.5 mg cm^(−2).

关键词： graphene/CNT hybrid lithium-sulfur batteries multidimensional architecture nanoparticle encapsulation redox promoter

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Caruncle excision to treat epiphora caused by caruncle swelling in patients with active Graves' ophthalmopathy:case series

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International Journal of Ophthalmology(English edition) 2016年第11期9卷 1691-1693页

作者： yoon Jin Kong Sang Youn Han Jin Sook yoon Sun young Jang Department of Ophthalmology Soonchunhyang University Bucheon HospitalSoonchunhyang University College of Medicine Department of Ophthalmology Kim's Eye HospitalMyung-Gok Eye Research InstituteKonyang University College of Medicine Department of Ophthalmology Severance HospitalInstitute of Vision ResearchYonsei University College of Medicine

Dear Editor,Iam yoon Jin Kong from the Department of Ophthalmology,Soonchunhyang University Bucheon Hospital,Bucheon,***,we describe a series of three patients with active Graves＇ophthalmopathy（GO）who presented wit... 详细信息

关键词： ophthalmopathy Caruncle excision to treat epiphora caused by caruncle swelling in patients with active Graves

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A Study of the Vortical Flow over a Delta Wing with a Leading Edge Extension

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Journal of Thermal Science 2003年第4期12卷 299-303页

作者： Heuy-Dong Kim young-Ki Lee tae-Ho Kim Myoung-Hwan Sohn School of Mechanical Engineering Andong National University Andong 760-749 KoreaSchool of Mechanical Engineering Andong National University Andong 760-749 KoreaSchool of Mechanical Engineering Andong National University Andong 760-749 KoreaDepartment of Aerospace Engineering Korean Air Force Academy Chongwon-gun ChungBook-Do 363-849 Korea

The present paper describes computational and experimental work on the vortex flow characteristics of a sharp-edged delta wing with a leading edge extension (LEX). Experiment was carried out using a low-speed wind tunnel that has a test section of 3.5 m(W)×2.45 m(H)×8.7 m(L). The angle of attack of the delta wing ranges from 10° to 30°. The free stream velocity is fixed at 20 m/s, which corresponds to Reynolds number of 0.88×106. Computations using the mass-averaged implicit 3D Navier-Stokes equations were applied to predict the complicated vortical flow over the delta wing. The governing equations were discretized in space using a fully implicit finite volume differencing formation. The standard k-e turbulent model was employed to close the governing equations. The present computations predicted the experimented flow field with a good accuracy.

关键词： delta wing leading edge extension (LEX) vortex core vortex strength.

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Efficient photovoltaic effect in graphene/h-BN/silicon heterostructure self-powered photodetector

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Nano Research 2021年第6期14卷 1967-1972页

作者： Ui Yeon Won Boo Heung Lee young Rae Kim Won tae Kang Ilmin Lee Ji Eun Kim young Hee Lee Woo Jong Yu Department of Electrical and Computer Engineering Sungkyunkwan UniversitySuwon16419Republic of Korea Center for Integrated Nanostructure Physics Institute for Basic Science(IBS)Suwon16419Republic of Korea

Graphene(Gr)/Si-based optoelectronic devices have attracted a lot of academic attention due to the simpler fabrication processes,low costs,and higher performance of their two-dimensional(2D)/three-dimensional(3D)hybrid interfaces in Schottky junction that promotes electron-hole ***,due to the built-in potential of Gr/Si as a photodetector,the Iph/Idark ratio is often hindered near zero-bias at relatively low illumination *** is a major drawback in self-powered *** this study,we have demonstrated a self-powered van der Waals heterostructure photodetector in the visible range using a Gr/hexagonal boron nitride(h-BN)/Si structure and clarified that the thin h-BN insertion can engineer asymmetric carrier transport and avoid interlayer coupling at the *** dark current was able to be suppressed by inserting an h-BN insulator layer,while maintaining the photocurrent with minimal decrease at near *** a result,the normalized photocurrent-to-dark ratio(NPDR)is improved more than 104 ***,both Iph/Idark ratio and detectivity,increase by more than 104 times at−0.03 V drain *** proposed Gr/h-BN/Si heterostructure is able to contribute to the introduction of next-generation photodetectors and photovoltaic devices based on graphene or silicon.

关键词： graphene hexagonal boron nitride van der Waals heterostructure self-powered Research

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Successful recanalization of acute superior mesenteric artery thrombotic occlusion with primary aspiration thrombectomy

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World Journal of Gastroenterology 2010年第32期16卷 4112-4114页

作者： Hye Jin Yang young Kwon Cho Yun Ju Jo yoon young Jung Seung A Choi Suk Hoon Lee Department of Radiology Eulji General HospitalEulji UniversitySeoul 139-711South Korea Department of Internal Medicine Eulji General HospitalEulji UniversitySeoul 139-711South Korea

Prompt revascularization of the superior mesenteric artery(SMA) thrombotic occlusion can prevent intestinal infarction and decrease necrosis of the bowel ***,we describe two cases who underwent successful endovascular recanalization for acute SMA thrombosis using a primary aspiration thrombectomy because of possible consequent laparotomy for survey of bowel *** two patients had dramatic pain reliefimmediately after the procedure and remained symptomfree during the follow-up period.

关键词： Superior mesenteric artery Thrombosis Aspiration thrombectomy

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