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Dimensionality-driven metal to Mott insulator transition in two-dimensional 1T-TaSe2

National Science Review 2024年第3期11卷 108-118页

作者： Ning Tian Zhe Huang Bo Gyu Jang Shuaifei Guo Ya-Jun Yan Jingjing Gao Yijun Yu Jinwoong Hwang Cenyao Tang Meixiao Wang Xuan Luo Yu Ping Sun Zhongkai Liu Dong-Lai Feng Xianhui Chen sung-Kwan Mo Minjae kim Young-Woo Son Dawei Shen Wei Ruan Yuanbo Zhang State Key Laboratory of Surface Physics New Cornerstone Science Laboratory and Department of PhysicsFudan University Shanghai Qi Zhi Institute Shanghai Research Center for Quantum Sciences Institute for Nanoelectronic Devices and Quantum Computing Fudan University Zhangjiang Fudan International Innovation Center Fudan University State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology(SIMIT)Chinese Academy of Sciences School of Physical Science and Technology ShanghaiTech University Korea Institute for Advanced Study School of Emerging Technology and Department of Physics University of Science and Technology of China Advanced Light Source Lawrence Berkeley National Laboratory ShanghaiTech Laboratory for Topological Physics Key Laboratory of Materials Physics Institute of Solid State Physics Hefei Institutes of Physical ScienceChinese Academy of Sciences High Magnetic Field Laboratory Hefei Institutes of Physical Science Chinese Academy of Sciences Collaborative Innovation Centre of Advanced Microstructures Nanjing University Department of Physics University of Science and Technology of China and Key Laboratory of Strongly Coupled Quantum Matter Physics Chinese Academy of Sciences National Synchrotron Radiation Laboratory University of Science and Technology of China

Two-dimensional materials represent a major frontier for research into exotic many-body quantum phenomena. In the extreme two-dimensional limit, electron-electron interaction often dominates over other electronic energy scales, leading to strongly correlated effects such as quantum spin liquid and unconventional *** dominance is conventionally attributed to the lack of electron screening in the third dimension. Here, we discover an intriguing metal to Mott insulator transition in 1T-TaSe2that defies conventional wisdom. Specifically, we find that dimensionality crossover, instead of reduced screening, drives the transition in atomically thin 1T-TaSe2. A dispersive band crossing the Fermi level is found to be responsible for the bulk metallicity in the material. Reducing the dimensionality,however, effectively quenches the kinetic energy of these initially itinerant electrons, and drives the material into a Mott insulating *** dimensionality-driven metal to Mott insulator transition resolves the long-standing dichotomy between metallic bulk and insulating surface of 1T-TaSe2. Our work further reveals a new pathway for modulating two-dimensional materials that enables exploring strongly correlated systems across uncharted parameter space.

关键词： two-dimensional materials 1T-TaSe2 dimensionality crossover metal to Mott insulator transition

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Variation in dynamic deformation behavior and resultant yield asymmetry of AZ80 alloy with extrusion temperature

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Journal of Materials Science & Technology 2020年第11期42卷 225-236页

作者： Sang-Hoon kim Sang Won Lee Byoung Gi moon Ha Sik kim sung Hyuk Park School of Materials Science and Engineering Kyungpook National UniversityDaegu702701South Korea Implementation Research Division Korea Institute of Materials ScienceChangwon51508South Korea

In this work,variation in the dynamic recrystallization(DRX)and dynamic precipitation behavior of AZ80 alloy during extrusion due to changes in extrusion temperature was investigated,and the resultant microstructure and yield asymmetry were *** the extrusion temperature increases from 250℃to 350℃,the primary DRX mechanism changes from twin-induced DRX to discontinuous DRX,resulting in an increase in the DRX area fraction and un DRXed grain *** addition,as the extrusion temperature rises,Mg17Al12 precipitation during extrusion decreases sharply throughout the extruded *** reduction in the compressive yield strength(CYS)with increasing extrusion temperature is more pronounced than it is for the tensile yield strength(TYS),which ultimately increases the yield asymmetry of the extruded *** higher extrusion temperature has less of an influence on the TYS due to the promotion of certain hardening *** the other hand,the greater reduction in the CYS is attributed to the increased fraction and size of regions in which{1012}twins predominantly form and the lower amount of precipitates,which effectively facilitates{1012}twinning.

关键词： Magnesium alloys Extrusion Recrystallization Precipitation Yield asymmetry

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Extrusion limit diagram of AZ91–0.9Ca–0.6Y–0.5MM alloy and effects of extrusion parameters on its microstructure and mechanical properties

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Journal of Magnesium and Alloys 2022年第12期10卷 3447-3458页

作者： Dong HeeLee Ye Jin kim Sang-Hoon kim Byoung Gi moon sung Hyuk Park School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Agency for Defense Development Daejeon 34186Republic of Korea Advanced Metals Division Korea Institute of Materials ScienceChangwon 51508Republic of Korea

An AZ91–0.9Ca–0.6Y–0.5MM(AZXWMM91100) alloy, which has higher corrosion resistance, ignition resistance, and extrudability than a commercial AZ91 alloy, has been developed recently. In this study, the AZXWMM91100 alloy is extruded at various temperatures(300–400 ℃) and ram speeds(1–14.5 mm/s), and the cracking behaviors, microstructure, and tensile properties of the extruded materials are systematically analyzed. On the basis of the pressure limit and surface and internal cracking limit, the extrusion limit diagram providing a safe extrusion processing zone is established. All of the materials extruded at temperatures and speeds within the safe extrusion processing zone have high surface quality and moderate tensile ductility with an elongation higher than 10%. Moreover, they have a fully recrystallized grain structure and contain undissolved particle stringers arranged parallel to the extrusion direction. The grain size of the extruded material does not show any relationship with the Zener–Hollomon parameter(Z). However, the yield strength(YS) of the extruded material is inversely proportional to the logarithm of the Z value, and their relationship is expressed as YS =-31.2·log(Z) + 536. These findings may broaden the understanding of the AZXWMM91100 alloy with excellent chemical and physical properties and provide valuable information for the development of high-performance extruded Mg products using this alloy.

关键词： Magnesium Extrudability Extrusion limit diagram Microstructure Tensile properties

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Temporal profiles of synaptic plasticity-related signals in adult mouse hippocampus with methotrexate treatment

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Neural Regeneration Research 2012年第21期7卷 1651-1658页

作者： Miyoung Yang Juhwan kim sung-Ho kim Joong-Sun kim Taekyun Shin Changjong moon Department of Veterinary Anatomy College of Veterinary Medicine and Animal Medical Institute Chonnam National University Department of Experimental Radiation Research Center Dongnam Institute of Radiological & Medical Sciences (DIRAMS) Department of Veterinary Anatomy College of Veterinary Medicine Jeju National University

Methotrexate, which is used to treat many malignancies and autoimmune diseases, affects brain functions including hippocampal-dependent memory function. However, the precise mechanisms underlying methotrexate-induced hippocampal dysfunction are poorly understood. To evaluate temporal changes in synaptic plasticity-related signals, the expression and activity of N-methyI-D-aspartic acid receptor 1, calcium/calmodulin-dependent protein kinase II, extracellular signal-regulated kinase 1/2, cAMP responsive element-binding protein, glutamate receptor 1, brain-derived neurotrophic factor, and glial cell line-derived neurotrophic factor were examined in the hippocampi of adult C57BL/6 mice after methotrexate （40 mg/kg） intraperitoneal injection. Western blot analysis showed biphasic changes in synaptic plasticity-related signals in adult hippocampi following methotrexate treatment. N-methyI-D-aspartic acid receptor 1, calcium/calmodulin-dependent protein kinase II, and glutamate receptor 1 were acutely activated during the early phase （1 day post-injection）, while extracellular signal-regulated kinase 1/2 and cAMP responsive element-binding protein activation showed biphasic increases during the eady （1 day post-injection） and late phases （7-14 days post-injection）. Brain-derived neurotrophic factor and glial cell line-derived neurotrophic factor expression increased significantly during the late phase （7-14 days post-injection）. Therefore, methotrexate treatment affects synaptic plasticity-related signals in the adult mouse hippocampus, suggesting that changes in synaptic plasticity-related signals may be associated with neuronal survival and plasticity-related cellular remodeling.

关键词： hippocampus methotrexate neurotrophic factor synaptic plasticity-related signal neuralregeneration

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Effect of preparation method of noble metal supported catalyts on formaldehyde oxidation at room temperature: Gas or liquid phase reduction

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Journal of Environmental Sciences 2022年第12期34卷 201-216页

作者： Younghee Jang Ye Hwan Lee Hanki Eom Sang moon Lee sung Su kim Department of Environmental Energy Envineering Graduate School of kyonggi UniversityGyeonggi-do 16227Korea Department of Environmental Energy Engineeing Kyonggi UniversityGyonggi-do 16227Korea

Formaldehyde(HCHO) is toxic to the human body and is one of the main threats to the indoor air quality(IAQ). As such, the removal of HCHO is imperative to improving the IAQ,whereby the most useful method to effectively remove HCHO at room temperature is catalytic oxidation. This review discusses catalysts for HCHO room-temperature oxidation,which are categorized according to their preparation methods, i.e., gas-phase reduction and liquid-phase reduction methods. The HCHO oxidation performances, structural features,and reaction mechanisms of the different catalysts are discussed, and directions for future research on catalytic oxidation are reviewed.

关键词： Formaldehyde Indoor air quality Catalyst Prepared method

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Transparent-cap-fitted colonoscopy shows higher performance with cecal intubation time in difficult cases

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World Journal of Gastroenterology 2012年第16期18卷 1953-1958页

作者： Hyung Hun kim Seun Ja Park Moo In Park Won moon sung Eun kim Department of Internal Medicine Kosin University College of MedicineBusan 602-702South Korea

AIM:To investigate the efficacy of cap-fitted colonoscopy(CFC) with regard to cecal intubation ***:Two hundred and ninety-five patients undergoing screening colonoscopy at Gospel Hospital,Kosin University College of Medicine were enrolled in this randomized controlled trial between January and December *** were conducted by a single *** characteristics including age,sex,body mass index,history of abdominal surgery,quality of preparation,and the presence of diverticulosis were ***:One hundred and fifty patients were allocated into a CFC group and 145 into a non-CFC(NCF) *** intubations were achieved in all *** intubation time in the CFC group was significantly shorter than in the NCF group for specific conditions:age ≥ 60 years,prior abdominal surgery,and poor bowel *** number of detected adenomas was higher in the CFC group than in the NCF group(P = 0.040).CONCLUSION:CFC facilitated shortening of the cecal intubation time in difficult cases,and was more sensitive for detecting adenomas than was NCF.

关键词： Colonoscopy Cap-fitted colonoscopy Cecal intubation

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Effect of W/C ratio and cover thickness on polarization characteristics of embedded steel in mortar

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中国有色金属学会会刊：英文版 2009年第4期19卷 909-912页

作者： Kyung-Man moon sung-Yul LEE Myung-Hoon LEE Yun-Hae kim Department of Mechanical and Material Engineering Korea Maritime University Department of Marine System Engineering Korea Maritime University

The effects of cover thickness and W/C(water-to-cement) ratio on polarization properties of embedded steel bar were investigated with electrochemical *** potentials shift to the noble direction with increasing the cover *** addition,when the cover thickness increasingly becomes thinner and thinner,effect of the W/C ratio on variation of corrosion potential increases as *** value at 100 kHz indicating the resistance of cover thickness increases with the decrement of W/C ratio as well as the increment of cover ***,in the case of W/C ratio at 0.6,impedance at 10 mHz shows the relatively larger value than that at W/C ratio of 0.4 or 0.5 in the range of cover thickness from 4 to 8 cm,which is probably expected that oxide film built up on the surface of steel bar due to strong alkali environment by hydration reaction with increasing W/C ratio is performed as the resistance *** is also observed that liquid junction potential tends to increase with decreasing W/C ratio.

关键词：保护层厚度嵌入式偏振特性钢筋砂浆覆盖厚度极化性能电化学方法

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Brain-derived neurotropic factor and GABAergic transmission in neurodegeneration and neuroregeneration

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Neural Regeneration Research 2017年第10期12卷 1733-1741页

作者： Jinwook kim Sueun Lee Sohi Kang sung-Ho kim Jong-Choon kim Miyoung Yang Changjong moon Departments of Veterinary Anatomy and Veterinary Toxicology College of Veterinary Medicine and BK21 PLUS Project TeamChonnam National University Department of Anatomy School of Medicine and Institute for Environmental ScienceWonkwang University

Neurotoxicity induced by stress,radiation,chemicals,or metabolic diseases,is commonly associated with excitotoxicity,oxidative stress,and *** pathological process of neurotoxicity induces neuronal death,interrupts synaptic plasticity in the brain,and is similar to that of diverse neurodegenerative *** models of neurotoxicity have revealed that clinical symptoms and brain lesions can recover over time via neuroregenerative ***,brain-derived neurotropic factor（BDNF） and gamma-aminobutyric acid（GABA）-ergic transmission are related to both neurodegeneration and *** review summarizes the accumulating evidences that suggest a pathogenic role of BDNF and GABAergic transmission,their underlying mechanisms,and the relationship between BDNF and GABA in neurodegeneration and *** review will provide a comprehensive overview of the underlying mechanisms of neuroregeneration that may help in developing potential strategies for pharmacotherapeutic approaches to treat neurotoxicity and neurodegenerative disease.

关键词： brain-derived neurotropic factor neurotoxicity gamma-aminobutyric acid-ergic transmission neurodegenerative diseases neural regeneration

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Utilizing 3,4-ethylenedioxythiophene(EDOT)-bridged non-fullerene acceptors for efficient organic solar cells

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Journal of Energy Chemistry 2022年第2期31卷 194-204页

作者： sung Jae Jeon Young Hoon kim Ie Na kim Nam Gyu Yang Ji Hee Yun Doo Kyung moon Nano and Information Materials(NIMs)Laboratory Department of Chemical EngineeringKonkuk University120 Neungdong-ro Gwangjin-guSeoul 05029South Korea Department of Academy of Applied Science and Technology Konkuk University120 Neungdong-ro Gwangjin-guSeoul 05029South Korea

A rational design of efficient low-band-gap non-fullerene acceptors(NFAs)for high-performance organic solar cells(OSCs)remains challenging;the main constraint being the decrease in the energy level of the lowest unoccupied molecular orbitals(LUMOs)as the bandgap of A-D-A-type NFAs ***,the short current density(J_(sc))and open-circuit voltage(V_(oc))result in a trade-off relationship,making it difficult to obtain efficient ***,three NFAs(IFL-ED-4 F,IDT-ED-4 F,and IDTT-ED-2 F)were synthesized to address the above-mentioned issue by introducing 3,4-ethylenedioxythiophene(EDOT)as aπ-*** NFAs exhibit relatively low bandgaps(1.67,1.42,and 1.49 eV,respectively)and upshifted LUMO levels(-3.88,-3.84,and-3.81 eV,respectively)compared with most reported low-band-gap ***,the photovoltaic devices based on IDT-ED-4 F blended with a PBDB-T donor polymer showed the best power conversion efficiency(PCE)of 10.4%with a high J_(sc) of 22.1 mA cm^(-2) and Voc of 0.884 V among the examined *** contrast,IDTT-ED-4 F,which was designed with an asymmetric structure of the D-p-A type,showed the lowest efficiency of 1.5%owing to the poor morphology and charge transport properties of the binary ***,when this was introduced as the third component of the PM6:BTP-BO-4 Cl,complementary absorption and cascade energy-level alignment between the two substances could be ***,the IDTT-ED-4 F-based ternary blend device not only improved the Jscand Voc,but also achieved a PCE of 15.2%,which is approximately 5.3%higher than that of the reference device with a minimized energy loss of 0.488 *** addition,the universality of IDTT-ED-2 F as a third component was effectively demonstrated in other photoactive systems,specifically,PM6:BTPe C9 and PTB7-Th:IEICO-4 *** work facilitates a better understanding of the structure–property relationship for utilizing efficient EDOT-bridged NFAs in high-performance OSC applications.

关键词： Non-fullerene acceptor 3,4-ethylenedioxythiophene Organic solar cell π-bridge π-spacer

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Epigenetic mechanisms involved in the neuroprotective effect of scorpion extract in a Parkinson's disease murine model based on multi-omics approach

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Journal of Traditional Chinese Medicine 2021年第3期41卷 390-396页

作者： Joong Sun kim Hye-Sun Lim Byeong Cheol moon Mary Jasmin Ang sung-Ho kim Changjong moon Boseok Seong Yunji Jang Hyung-Yong kim Chul kim Herbal Medicine Resources Research Center Korea Institute of Oriental MedicineJeollanamdo 58245Republic of Korea College of Veterinary Medicine and BK21 Plus Project Team Chonnam National UniversityGwangju 61186Republic of Korea Future Medicine Division Korea Institute of Oriental MedicineDaejeon 34054Republic of Korea Research and Development Center Insilicogen Inc.Yonginsi 16954Republic of Korea

OBJECTIVE: To investigate whether scorpion extract elicits a neuroprotective effect in 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine(MPTP)-treated mice models, and the genes associated with the therapeutic effects using RNA sequencing(seq)***: This study investigated the changes in interaction between messenger ribonucleic acid(m RNA) expression and deoxyribonucleic acid(DNA) methylation related to the protective effects of scorpion extracts, in the substantia nigra(SN)region of a MPTP-induced Parkinson's disease(PD)***: In this model, scorpion extracts attenuated the motor impairment as demonstrated by the rotarod and open field tests. Scorpion extracts consistently attenuated the decrease of tyrosine hydroxylase(TH) positive neural cells in the SN and striatum of mice. We profiled genomewide DNA methylation using Methyl-Seq and measured the transcriptome using RNA-Seq in murine SN in the following groups: vehicle-treated MPTP-induced PD mice and scorpion extracttreated MPTP-induced PD mice. In total, 13 479 differentially expressed genes were identified in association with the anti-PD effect of the scorpion extract, mainly in the promoter and coding *** them, 47 were negatively correlated downregulated genes. Nineteen genes out of 47 downregulated genes were negatively correlated with the expression of the other 28 genes. Among these genes, SGSM1 was related to dopaminergic neurons including dopamine transporters, TH, dihydroxyphenylalanine decarboxylase, and dopamine D2 ***: This study provides insights into the anti-parkinsonian effects of scorpion extract and reveals the epigenetic targets in its therapeutic mechanism.

关键词： scorpions 1-methyl-4-phenyl-1 2 3 6-tetrahydropyridine Parkinson disease DNA methylation

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