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Prominent cycling reversibility and kinetics enabled by CaTiO_(3) protective layer on Zn metal for aqueous Zn-ion batteries

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Journal of Energy Chemistry 2025年第1期100卷 245-258页

作者： Gaeun lee Yong Nam Ahn Seongjoon So Chanwoo Park Jong-Seong Bae Taehyun Park Il Tae Kim Jaehyun Hur School of Chemical Biologicaland Battery EngineeringGachon UniversitySeongnamGyeonggi 13120Republic of Korea Busan Center Korea Basic Science InstituteBusan 46742Republic of Korea

Aqueous Zn-ion batteries (AZIBs) have received considerable attention owing to their various advantages such as safety,low cost,simple battery assembly conditions,and high ionic ***,they still suffer from serious problems,including uncontrollable dendrite growth,corrosion,hydrogen evolution reaction (HER) from water decomposition,electrode passivation,and unexpected *** creation of a uniform artificial nanocrystal layer on the Zn anode surface is a promising strategy for resolving these ***,we propose the use of a perovskite CaTiO_(3)(CTO) protective layer on Zn(CTO@Zn) as a promising approach for improving the performance of *** CTO artificial layer provides an efficient pathway for Zn ion diffusion towards the Zn metal because of the high dielectric constant (εr=180) and ferroelectric characteristics that enable the alignment of dipole moments and redistribute the Zn^(2+)ions in the CTO *** avoiding the direct contact of the Zn anode with the electrolyte solution,the uneven dendrite growth,corrosion,parasitic side reactions,and HER are mitigated,while CTO retains its mechanical and chemical robustness during ***,CTO@Zn demonstrates an improved lifespan in a symmetric cell configuration compared with bare ***@Zn shows steady overpotential (~68 m V) for 1500 h at 1 mA cm^(-2)/0.5 mA h cm^(-2),excelling bare ***,when paired with the V_(2)O_(5)-C cathode,the CTO@Zn//V_(2)O_(5)-C full battery delivers 148.4 mA h g^(-1)(based on the mass of the cathode) after 300 *** study provides new insights into Zn metal anodes and the development of high-performance AZIBs.

关键词： CaTiO_(3) Artificial layer Dielectric constant Znmetal anode Zinc aqueous battery

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Two macrophages, osteoclasts and microglia: from development to pleiotropy

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Bone Research 2021年第2期9卷 143-152页

作者： Ji-won lee In-Hee lee Tadahiro Iimura Sek won Kong Department of Nephrology Transplant Research ProgramBoston Children’s HospitalBostonMA 02115USA Department of Pharmacology Graduate School of Dental MedicineHokkaido UniversitySapporo 060-8586Japan Computational Health Informatics Program Boston Children’s HospitalBostonMA 02115USA Department of Pediatrics Harvard Medical SchoolBostonMA 02115USA

Tissue-resident macrophages are highly specialized to their tissue-specific microenvironments,activated by various inflammatory signals and modulated by genetic and environmental *** and microglia are distinct tissue-resident cells of the macrophage lineage in bone and brain that are responsible for pathological changes in osteoporosis and Alzheimer’s disease(AD),*** is more frequently observed in individuals with AD compared to the prevalence in general *** of AD is often delayed until underlying pathophysiological changes progress and cause irreversible damages in structure and function of *** such earlier diagnosis and intervention of individuals at higher risk would be indispensable to modify clinical *** is the phenomenon that a genetic variant affects multiple traits and the genetic correlation between two traits could suggest a shared molecular *** this review,we discuss that the Pyk2-mediated actin polymerization pathway in osteoclasts and microglia in bone and brain,respectively,is the horizontal pleiotropic mediator of shared risk factors for osteoporosis and AD.

关键词： diagnosis osteoporosis osteoclast

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Catalysts for electrochemical ammonia oxidation:Trend,challenge,and promise

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Science China Materials 2022年第12期65卷 3334-3352页

作者： Sol A lee Mi Gyoung lee Ho won Jang Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea Department of Electrical and Computer Engineering University of TorontoToronto M5S 3G4OntarioCanada Advanced Institute of Convergence Technology Seoul National UniversitySuwon 16229Republic of Korea

Developing sustainable and clean energy technology is critial to address the current energy and environmental *** an energy carrier,hydrogen has been getting attention due to its abundance,high energy density,and zero carbon *** to the difficulty of hydrogen storage and transport,the electro-oxidation of ammonia shows great potential for renewable energy since it satisfies both energy supply and environmental protection as a carbon-free fuel with high hydrogen ***,ammonia electro-oxidation is a sluggish reaction and shows low *** the complicated mechanism and intermediates is conducive to developing efficient electrocatalysts with high catalytic activity and *** review begins with the ammonia oxidation technologies and their *** two typical mechanisms for ammonia electro-oxidation,Oswin-Salomon mechanism and Gerischer-Mauerer mechanism,are discussed,and attention to the poisoning species is ***,the electrocatalysts for ammonia reaction are classified into Pt-based catalysts and non-noble metal-based catalysts,and their performances are reviewed with various *** on the progress on the electrochemical ammonia oxidation catalysts,the challenges and future insight on ammonia oxidation reaction are discussed and proposed.

关键词： NH3 oxidation reaction electrocatalysts green hydrogen

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Extraction of rare earth elements from neodymium(NdFeB) magnet scrap using magnesium halides

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Journal of Rare Earths 2025年第2期43卷 371-376页

作者： Sung Gue Heo Jae Yeol Yang Soong Ju Oh Seok-Jun Seo Mi Hye lee Kyoung-Tae Park Korea Institute for Rare Metals Korea Institute of Industrial Technology Department of Materials Science and Engineering Korea University

The demand for neodymium（NdFeB） permanent magnets for electric vehicles and eco-friendly generators is ***,NdFeB magnets contain rare earth elements（REEs）,which are limited in *** this study,we performed an exchange reaction between magnesium halides（fluoride and chloride） and waste NdFeB scrap and then compared the characteristics of the extracted halides *** compositions of the ternary Mg fluoride（LiF:NaF:MgF2=50:40:10 in mole ratio） and chloride（LiCl:NaCl:MgCl2=10:50:40 in mole ratio） salts were thermodynamically determined for achieving low eutectic *** reactions between the NdFeB scrap powder（1-2 mm） and Mg halide salts were carried out at 1073 and 873 K for the fluoride and chloride systems,respectively,in an argon *** the reaction,we separated Nd halide from the residual salt and evaluated the Ndextraction *** phase formation of the salt was analyzed using X-ray diffraction（XRD）,and the extraction rate of Nd was analyzed using inductively coupled plasma optical emission spectroscopy（ICPOES）.Nd was extracted in the form of Nd halide（NdF3or NdCl3）,and the extraction rates in the fluoride and chloride systems are 98.64% and 84.59%,***,the fluoride system is more effective than the chloride system for Nd *** study provides a comprehensive comparative analysis of the effectiveness of fluo ride and chlo ride systems in extracting REEs from NdFeB magnet *** study findings can be used to develop an effective method for recycling magnet scraps.

关键词： Fluoride system Magnesium halide Metal-scrap recycling Nd extraction Neodymium magnet Rare earth elements

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Pyrometallurgical recycling of end-of-life lithium-ion batteries

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International Journal of Minerals,Metallurgy and Materials 2024年第7期31卷 1554-1571页

作者： Juheon lee Kwang won Park Il Sohn Sanghoon lee Department of Materials Science and Engineering Seoul 03722Korea Yonsei Industry Cooperation Center Yonsei UniversitySeoul 03722Korea RD Solution Wanju gunJeollabuk do 55365Korea

The global importance of lithium-ion batteries(LIBs)has been increasingly underscored with the advancement of high-performance energy storage ***,the end-of-life of these batteries poses significant challenges from environmental,economic,and resource management *** review paper focuses on the pyrometallurgy-based recycling process of lithium-ion batteries,exploring the fundamental understanding of this process and the importance of its *** on the high energy consumption and emission gas issues of the pyrometallurgical recycling process,we systematically analyzed the capital-intensive nature of this process and the resulting technological ***,we conducted an in-depth discussion on the future research directions to overcome the existing technological barriers and *** review will provide valuable insights for researchers and industry stakeholders in the battery recycling field.

关键词： spent lithium-ion batteries recycling sustainability lithium valuable metal

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Onstage,Behind Bars

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空中英语教室(高级版.彭蒙惠英语) 2025年第2期 20-22,43-45页

作者： Ashley lee 不详

The new movie Sing Sing is set in the maximum-security correctional facility of the same name,a gray and Gothic structure in upstate New York designed to punish its sentenced inhabitants But the majority of the film takes place in an expansive auditorium,with vaulted ceilings and large windows that bathe the space in natural light.

关键词： correction audit film

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Effect of light scattering on the performance of a direct absorption solar collector

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Frontiers in Energy 2018年第1期12卷 169-177页

作者： Kwang Hyun won Bong Jae lee Department of Mechanical Engineering Korea Advanced Institute ofScience and Technology Daejeon 34141 South Korea

Recently, a solar thermal collector often employs nanoparticle suspension to absorb the solar radiation directly by a working fluid as well as to enhance its thermal performance. The collector efficiency of a direct absorption solar collector （DASC） is very sensitive to optical properties of the working fluid, such as absorption and scattering coefficients. Most of the existing studies have neglected particle scattering by assuming that the size of nanoparticle suspension is much smaller than the wavelength of solar radiation （i.e., Rayleigh scattering is applicable）. If the nanoparticle suspension is made of metal, however, the scattering cross-section of metallic nanoparticles could be comparable to their absorption cross-section depending on the particle size, especially when the localized surface plasmon （LSP） is excited. Therefore, for the DASC utilizing a plasmonic nanofluid supporting the LSP, light scattering from metallic particle suspension must be taken into account in the thermal analysis. The present study investigates the scattering effect on the thermal performance of the DASC employing plasmonic nanofluid as a working fluid. In the analysis, the Monte Carlo method is employed to numerically solve the radiative transfer equation considering the volume scatter- ing inside the nanofluid. It is found that the light scattering can improve the collector performance if the scattering coefficient of nanofluid is carefully engineered depending on its value of the absorption coefficient.

关键词： direct absorption solar collector plasmonicnanofluid light scattering

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Enhancement of motor functional recovery in thoracic spinal cord injury: voluntary wheel running versus forced treadmill exercise

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Neural Regeneration Research 2025年第3期20卷 836-844页

作者： Do-Hun lee Dan Cao Younghye Moon Chen Chen Nai-Kui Liu Xiao-Ming Xu Wei Wu Spinal Cord and Brain Injury Research Group Stark Neurosciences Research InstituteIndiana University School of MedicineIndianapolisINUSA Department of Neurological Surgery Indiana University School of MedicineIndianapolisINUSA Department of Neuroscience Baylor College of MedicineHoustonTXUSA

Spinal cord injury necessitates effective rehabilitation strategies, with exercise therapies showing promise in promoting recovery. This study investigated the impact of rehabilitation exercise on functional recovery and morphological changes following thoracic contusive spinal cord injury. After a 7-day recovery period after spinal cord injury, mice were assigned to either a trained group(10 weeks of voluntary running wheel or forced treadmill exercise) or an untrained group. Bi-weekly assessments revealed that the exercise-trained group, particularly the voluntary wheel exercise subgroup, displayed significantly improved locomotor recovery, more plasticity of dopaminergic and serotonin modulation compared with the untrained group. Additionally, exercise interventions led to gait pattern restoration and enhanced transcranial magnetic motor-evoked potentials. Despite consistent injury areas across groups, exercise training promoted terminal innervation of descending axons. In summary, voluntary wheel exercise shows promise for enhancing outcomes after thoracic contusive spinal cord injury, emphasizing the role of exercise modality in promoting recovery and morphological changes in spinal cord injuries. Our findings will influence future strategies for rehabilitation exercises, restoring functional movement after spinal cord injury.

关键词： behavioral assessment motor function neural plasticity running wheel exercise spinal cord injury treadmill exercise voluntary exercise

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Permeability evaluation for artificial single rock fracture according to geometric aperture variation using electrical resistivity

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第4期13卷 787-797页

作者： Hangbok lee Jong-won lee Tae-Min Oh Deep Subsurface Research Center Korea Institute of Geoscience and Mineral ResourcesDaejeon34132Republic of Korea Department of Civil and Environmental Engineering Pusan National UniversityBusan46241Republic of Korea

A convenient approach was proposed by which to evaluate and monitor the permeability of a rock fracture by verifying the quantitative correlation between the electrical resistivity and permeability at laboratory *** this purpose,an electrical resistivity measurement system was applied to the laboratory experiments using artificial cells with the shape of a single rock *** experiments were conducted using rock fractures according to the geometry,aperture sizes,wavelengths,and roughness *** overall negative relationship between the normalized electrical resistivity values and the aperture sizes directly linked with the permeability,was well fitted by the power-law function with a large determination coefficient(≈0.86).The effects of wavelength and roughness amplitude of the rock fracture on the electrical resistivity were also *** showed that the electrical resistivity was slightly increased with decreasing wavelength and increasing roughness *** empirical model for evaluating the permeability of a rock fracture was proposed based on the experimental *** the field,if the electrical resistivity of pore groundwater could be measured in advance,this empirical model could be applied effectively for simple,quick monitoring of the fracture *** uncertainty may be associated with the permeability estimation due to the limited control parameters considered in this research,this electrical resistivity approach could be helpful to monitor the rock permeability in deep underground facilities such as those used for radioactive waste repositories or forms of energy storage.

关键词： Permeability Rock fracture Electrical resistivity Fracture geometry Long-term monitoring

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Integrating Ontology-Based Approaches with Deep Learning Models for Fine-Grained Sentiment Analysis

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Computers, Materials & Continua 2024年第10期81卷 1855-1877页

作者： Longgang Zhao Seok-won lee The Knowledge-Intensive Software Engineering(NiSE)Research Group Department of Artificial IntelligenceAjou UniversitySuwon City16499Republic of Korea Department of Software and Computer Engineering Ajou UniversitySuwon City16499Republic of Korea

Although sentiment analysis is pivotal to understanding user preferences,existing models face significant challenges in handling context-dependent sentiments,sarcasm,and nuanced *** study addresses these challenges by integrating ontology-based methods with deep learning models,thereby enhancing sentiment analysis accuracy in complex domains such as film reviews and restaurant *** framework comprises explicit topic recognition,followed by implicit topic identification to mitigate topic interference in subsequent sentiment *** the context of sentiment analysis,we develop an expanded sentiment lexicon based on domainspecific corpora by leveraging techniques such as word-frequency analysis and word ***,we introduce a sentiment recognition method based on both ontology-derived sentiment features and sentiment *** evaluate the performance of our system using a dataset of 10,500 restaurant reviews,focusing on sentiment classification *** incorporation of specialized lexicons and ontology structures enables the framework to discern subtle sentiment variations and context-specific expressions,thereby improving the overall sentiment-analysis *** results demonstrate that the integration of ontology-based methods and deep learning models significantly improves sentiment analysis accuracy.

关键词： Deep learning ontology fine-grained sentiment analysis online reviews

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