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Statistics of oxidation resistance of Ni-(0-15)Co-(8-15)Cr-(0-5)Mo-(0-10)W-(3-8)Al-(0-5)Ti-(0-10)Ta-0.1C-0.01B superalloys at 1000℃ by compositional variations

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Rare Metals 2020年第8期39卷 918-927页

作者： Si-Jun Park Kyu-Hyuk Lee Seong-Moon Seo Hi-Won Jeong Young-Soo Yoo heejin jang Multi-Material Research Center Gwangju-Jeonnam DivisionKorea Automotive Technology InstituteGwangju 62207Republic of Korea Department of Advanced Materials Engineering Chosun UniversityGwangju 61452Republic of Korea High Temperature Materials Group Korea Institute of Materials ScienceChangwon 51508Republic of Korea Department of Materials Science and Engineering Chosun UniversityGwangju 61452Republic of Korea

The effects of alloying elements(Co,Cr,Mo,W,Al,Ti,and Ta)on the oxidation resistance of Ni-(0-15)Co-(8-15)Cr-(0-5)Mo-(0-10)W-(3-8)Al-(0-5)Ti-(0-10)Ta-0.1 C-0.01 B alloys were *** sample compositions were designed by the Box-Behnken method of design of experiments(DOE).The alloying elements show complicated effects on the mass gain due to oxidation,depending on the alloy *** reduces the mass gain *** other elements except Al do not appear to exert a strong effect on the oxidation rate on average,but their influences are shown clearly in the alloys with a low Al ***,W,and Ta reduce the oxidation rate,while Cr,Mo,and Ti promote *** is the most effective element in reducing the oxidation rate of the alloy with a low Al *** is confirmed that a continuous Al2O3 layer is essentially required for high oxidation *** oxide scale of easily oxidized alloys has various oxides such as NiCr2O4,NiAl2O4,NiO,Cr2O3,CrTaO4,and TiO2.

关键词： High temperature oxidation Alloy composition Ni-based superalloy Oxidation resistance Design of experiments

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Electrocatalytic and stoichiometric reactivity of 2D layered siloxene for high-energy-dense lithium-sulfur batteries

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Carbon Energy 2021年第6期3卷 976-990页

作者： Hui-Ju Kang Jae-Woo Park Hyun Jin Hwang heejin Kim Kwang-Suk jang Xiulei Ji Hae Jin Kim Won Bin Im Young-Si Jun Department of Advanced Chemicals&Engineering Chonnam National UniversityGwangjuRepublic of Korea Division of Analytical Science Korea Basic Science Institute(KBSI)DaejeonRepublic of Korea Department of Applied Chemistry Hanyang UniversityAnsanGyeonggi-doRepublic of Korea Department of Chemistry Oregon State UniversityCorvallisOregonUSA Division of Materials Science and Engineering Hanyang UniversitySeoulRepublic of Korea

Lithium-sulfur batteries(LSBs)have emerged as promising power sources for high-performance devices such as electric ***,the poor energy density of LSBs owing to polysulfide shuttling and passivation has limited their further market *** mitigate this challenge,two-dimensional(2D)siloxene(2DSi),a Si-based analog of graphene,is utilized as an additive for sulfur *** 2DSi is fabricated on a large scale by simple solvent extraction of calcium disilicide to form a thin-layered structure of Si planes functionalized with vertically aligned hydroxyl groups in the *** stoichiometric reaction of 2DSi with polysulfides generates a thiosulfate redox mediator,secures the intercalation pathway,and reveals Lewis acidic sites within the siloxene *** 2DSi utilizes the corresponding in-situ-formed electrocatalyst,the 2D confinement effect of the layered structure,and the surface affinity based on Lewis acid-base interaction to improve the energy density of 2DSi-based LSB *** with the commercial carbon-based current collector,2DSi-based LSB cells achieve a volumetric energy density of 612 Wh Lcell^(−1) at 1 mA cm^(−2) with minor degradation of 0.17%per cycle,which rivals those of state-of-the-art *** study presents a method for the industrial production of high-energy-dense LSBs.

关键词： 2D confinement effects Lewis acid-base interactions lithium-sulfur batteries siloxenes thiosulfate-polythionate redox couple

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Thick free-standing electrode based on carbon-carbon nitride microspheres with large mesopores for high-energy-density lithium-sulfur batteries

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Carbon Energy 2021年第3期3卷 410-423页

作者： Hui-Ju Kang Tae-Gyu Lee heejin Kim Jae-Woo Park Hyun Jin Hwang Hyeonseok Hwang Kwang-Suk jang Hae Jin Kim Yun Suk Huh Won Bin Im Young-Si Jun Department of Advanced Chemicals&Engineering Chonnam National UniversityBuk-guGwangjuRepublic of Korea Division of Analytical Science Korea Basic Science Institute(KBSI)Yuseong-guDaejeonRepublic of Korea School of Chemical Engineering Chonnam National UniversityBuk-guGwangjuRepublic of Korea Department of Applied Chemistry Hanyang UniversityAnsanGyeonggi-doRepublic of Korea Department of Biological Engineering Inha UniversityNam-guIncheonRepublic of Korea Division of Materials Science and Engineering Hanyang UniversitySeongdong-guSeoulRepublic of Korea

The development of sulfur cathodes with high areal capacity and high energy density is crucial for the practical application of lithium-sulfur batteries(LSBs).LSBs can be built by employing(ultra)high-loading sulfur cathodes,which have rarely been realized due to massive passivation and ***,microspheres of a carbon-carbon nitride composite(C@CN)with large mesopores are fabricated via molecular cooperative *** the C@CN-based electrodes,the effects of the large mesopores and N-functional groups on the electrochemical behavior of sulfur in LSB cells are thoroughly investigated under ultrahigh sulfur-loading conditions(>15 mgS cm^(-2)).Furthermore,for high-energy-density LSBs,the C@CN powders are pelletized into a thick free-standing electrode(thickness:500^m;diameter:11 mm)via a simple briquette process;here,the total amount of energy stored by the LSB cells is 39 mWh,corresponding to a volumetric energy density of 440 Wh L-1 with an areal capacity of 24.9 and 17.5 mAh cm^(-2) at 0.47 and 4.7 mA cm^(-2),respectively(at 24mgS cm^(-2)).These results have significantly surpassed most recent records due to the synergy among the large mesopores,(poly)sulfide-philic surfaces,and thick *** developed strategy with its potential for scale-up successfully fills the gap between laboratory-scale cells and practical cells without sacrificing the high areal capacity and high energy density,providing a solid foundation for the development of practical LSBs.

关键词： briquette process carbon nitride free-standing electrode high energy density lithium-sulfur batteries mesopores

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Comparison of Entropy vs. Bispectral Index Anesthetic Depth Monitoring during Isoflurane Anesthesia in Living Donor Liver Transplantation: Observational Study

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Open Journal of Anesthesiology 2021年第5期11卷 137-148页

作者： Sang Hyun Lee Janie jang Kyunga Kim heejin Yoo Yu Jeong Bang Ji-Won Choi Gaab Soo Kim Department of Anesthesiology and Pain Medicine Samsung Medical Center Sungkyunkwan University School of Medicine Seoul Korea Statistics and Data Center Research Institute for Future Medicine Samsung Medical Center Seoul Korea

Liver transplantation (LT) recipients are known to require less anesthetic agents. Providing minimally required anesthetics while avoiding awareness is especially important in LT recipients because it would help manage perioperative hemodynamic instability with less vasopressor and fast track recovery. This study aims to compare state entropy (SE) against bispectral index (BIS) during isoflurane anesthesia in LT. We adjusted anesthesia to BIS values 40 - 60, and compared it with concomitant SE values. BIS, SE values, and anesthetic requirements according to liver failure severity, etiology and LT stages were analyzed. For BIS-SE differences, SE value that is different from the concomitant BIS by more than 15 was defined as a significant disagreement. Mann Whitney, Kruskal Wallis test and a Poisson exact test were used for analysis. The BIS-SE pair sets of 2895 from 38 patients were analyzed. BIS, SE values and anesthetic requirements were significantly lower in MELD ≥ 20 (p < 0.001 in all) and in alcoholic etiology (p < 0.001 in all). For BIS-SE differences, 320 disagreement data pairs were seen at a rate of 1.33 times/hr (95% CI = [1.19, 1.48], p < 0.001). A significant disagreement was delineated in MELD score ≥ 20 (3.04 times/hr, CI = [2.64, 3.49], p < 0.001), alcoholic etiology (3.19 times/hr, [2.67, 3.78], p < 0.001) and postreperfusion stage (1.63 times/hr, [1.43, 1.85], p < 0.001). In these significant BIS-SE differences, 95.9% (307/320 disagreement data pairs) showed higher BIS than SE. In conclusion, in high MELD and alcoholic etiology, anesthetic requirements were significantly less, and BIS and SE showed great discrepancy with lower SE values. Therefore, when SE monitoring is used during LT, anesthesiologists may need to consider that in high MELD and alcoholic etiology, SE tends to show lower values than the concomitant BIS values that are within optimal anesthetic depth ranges.

关键词： Anesthetic Depth Bispectral Index Entropy Liver Transplantation Isoflurane

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Comparison of Entropy *** Index Anesthetic Depth Monitoring during Isoflurane Anesthesia in Living Donor Liver Transplantation: Observational Study

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Open Journal of Anesthesiology 2021年第5期

作者： Sang Hyun Lee Janie jang Kyunga Kim heejin Yoo Yu Jeong Bang Ji-Won Choi Gaab Soo Kim

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