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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 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 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

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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绘画中的哲学观——蒙克与存在主义的互文

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天津美术学院学报 2024年第3期 104-108页

作者：余怡君华中师范大学美术学院

存在主义哲学观点最早由19世纪上半叶的丹麦哲学家索伦·克尔凯郭尔提出,在20世纪初流行于德国并逐渐成为欧洲主流思潮,同时期出现的是由挪威艺术家爱德华·蒙克为代表的表现主义绘画。本文将揭示这一特定时期哲学与艺术在欧洲世纪交替... 详细信息

存在主义哲学观点最早由19世纪上半叶的丹麦哲学家索伦·克尔凯郭尔提出,在20世纪初流行于德国并逐渐成为欧洲主流思潮,同时期出现的是由挪威艺术家爱德华·蒙克为代表的表现主义绘画。本文将揭示这一特定时期哲学与艺术在欧洲世纪交替之际产生碰撞的原因和影响,并以艺术家爱德华·蒙克及其作品为例,剖析绘画中的哲学观。

关键词：爱德华·蒙克索伦·克尔凯郭尔存在主义哲学表现主义艺术

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基于改进切线角理论的十堰市变质岩滑坡预警阈值研究

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自然灾害学报 2024年第3期33卷 167-177页

作者：朱智超曾斌何文武于义军梅红专中国地质大学(武汉)环境学院湖北武汉430074 湖北省地质局冶金地质勘探大队湖北十堰442000

十堰市地形地貌复杂,地层岩性多变,变质岩广泛分布,区内滑坡灾害多发。为减轻滑坡灾害带来的严重危害,实现滑坡灾害的准确预警,基于改进切线角理论,结合累积加速度及累积加加速度,选取十堰市4个已发生破坏的变质岩滑坡地表位移监测数据... 详细信息

十堰市地形地貌复杂,地层岩性多变,变质岩广泛分布,区内滑坡灾害多发。为减轻滑坡灾害带来的严重危害,实现滑坡灾害的准确预警,基于改进切线角理论,结合累积加速度及累积加加速度,选取十堰市4个已发生破坏的变质岩滑坡地表位移监测数据。通过绘制其T-t曲线、累积加速度-时间曲线、累积加加速度-时间曲线,分析得到了十堰市变质岩滑坡蠕滑阶段的综合划分结果。确定临滑预警阈值判据为:T-t曲线切线角大于等于80°、累积加速度大于0,并且增长保持较大正值、累积加加速度大于0,且连续增长或保持高值。研究成果对十堰市变质岩滑坡的监测预警工作具有重要意义,同时也可为其他类型滑坡的监测预警阈值研究提供参考。

关键词：滑坡改进切线角变质岩预警阈值变形速率

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氢氧化钙髓腔封药治疗年轻恒牙牙髓感染的效果

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临床医学研究与实践 2024年第9期9卷 89-92页

作者：唐莉禹怡君南京市溧水区口腔病防治院江苏南京211200 南京大学医学院附属口腔医院江苏南京210008

目的分析氢氧化钙髓腔封药治疗方案对年轻恒牙牙髓感染牙体修复的促进价值。方法选取2018年2月至2021年3月收治的60例年轻恒牙牙髓感染患者为研究对象,依据编号的奇偶性将其分为对照组和观察组,各30例。对照组行三联抗生素髓腔封药治疗... 详细信息

目的分析氢氧化钙髓腔封药治疗方案对年轻恒牙牙髓感染牙体修复的促进价值。方法选取2018年2月至2021年3月收治的60例年轻恒牙牙髓感染患者为研究对象,依据编号的奇偶性将其分为对照组和观察组,各30例。对照组行三联抗生素髓腔封药治疗,观察组在对照组基础上加氢氧化钙治疗。比较两组的治疗效果。结果观察组的治疗总有效率略高于对照组,但差异无统计学意义(P>0.05)。治疗后,两组的根管壁厚度与牙根长度均增加,根尖孔直径与菌斑指数(PLI)评分均降低,且观察组优于对照组(P0.05)。结论氢氧化钙髓腔封药治疗年轻恒牙牙髓感染的效果优于三联抗生素髓腔封药治疗,但两者均有助于改善患者的恒牙牙体修复质量,提升口腔功能恢复效果,值得推广。

关键词：氢氧化钙年轻恒牙牙髓感染三联抗生素髓腔封药修复效果

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浙江省农地规模化的空间潜力与减氮增效研究

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农业资源与环境学报 2024年第1期41卷 27-35页

作者：黄璐瑶段佳堃邬奇峰虞轶俊徐建明谷保静浙江大学环境与资源学院杭州310058 浙江大学政策仿真实验室杭州310058 浙江省耕地质量与肥料管理总站杭州310016 杭州市临安区农林技术推广中心杭州311300 浙江省农业资源与环境重点实验室杭州310058

我国农业以小农经营为主,为解决浙江省细碎化经营带来的收益和资源利用效率低、面源污染严重等问题,本研究通过分析浙江耕地分布格局,量化浙江农地规模化潜力和空间优化路径,结合农田氮平衡和成本收益分析,评估农地规模化对浙江农业生... 详细信息

我国农业以小农经营为主,为解决浙江省细碎化经营带来的收益和资源利用效率低、面源污染严重等问题,本研究通过分析浙江耕地分布格局,量化浙江农地规模化潜力和空间优化路径,结合农田氮平衡和成本收益分析,评估农地规模化对浙江农业生产和环境效应的影响。结果表明:浙江耕地平均田块面积为0.4 hm^(2),面积低于0.6 hm^(2)的耕地占70%。通过土地整理,73%的耕地连片面积在16 hm^(2)以上。耕地连片规模化经营可以使氮肥投入减少53%,促进氮素利用效率从38%增加至56%。农业劳动力需求从每公顷4人减少至1人,农业投入成本降低77%,劳动力农业年均收入可提高9 457元。浙江省推动实施农地规模化具备良好的资源条件,在全省范围内推行有助于发挥农业生产提质增效和环境资源保护作用。政府应当加强政策引导、加大财政支持、推动农业转型,以农地规模化提升浙江农业可持续发展潜力。

关键词：农地规模化氮素利用效率农业收益浙江可持续发展

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土壤微生物影响土壤健康的作用机制研究进展

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土壤学报 2024年第2期61卷 331-347页

作者：孔亚丽秦华朱春权田文昊朱晓芳虞轶俊张均华水稻生物育种全国重点实验室中国水稻研究所杭州310006 浙江农林大学环境与资源学院杭州311300 土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所) 南京210008 浙江省耕地质量与肥料管理总站杭州310020

土壤健康是农业可持续发展的中心主题。土壤微生物参与土壤生态功能、环境功能和免疫功能协同驱动土壤生命系统运转,是维持土壤健康的核心与关键。了解不同微生物介导的土壤健康调控机制对有效利用这些核心微生物维持和改善土壤健康至... 详细信息

土壤健康是农业可持续发展的中心主题。土壤微生物参与土壤生态功能、环境功能和免疫功能协同驱动土壤生命系统运转,是维持土壤健康的核心与关键。了解不同微生物介导的土壤健康调控机制对有效利用这些核心微生物维持和改善土壤健康至关重要。本文围绕微生物参与调节土壤碳循环、养分循环,改变土壤结构、抑制植物病虫害、污染控制等主要生物过程系统梳理了微生物在调控土壤健康中的重要作用,以及微生物作为土壤健康的敏感指标对土壤健康的指示与预警作用。强调未来应加强驱动土壤健康特定功能以及多个生物过程的核心微生物组信息数据库挖掘、构建与生产应用研究,为定向利用微生物改善农业土壤生态系统功能、维持土壤健康以及保障土壤可持续发展提供科学依据。

关键词：土壤微生物土壤健康土壤功能生物标志物

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Responses of soil microbial communities to manure and biochar in wheat cultivation of a rice-wheat rotation agroecosystem in East China

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Pedosphere 2023年第6期33卷 893-904页

作者： Jun MENG Wenjin LI Yingbo QIU Zhangtao LI Linze LI yu LUO Haipeng GUO yijun yu Shengdao SHAN Huaihai CHEN Zhejiang Province Key Laboratory of Recycling and Ecological Treatment of Waste Biomass School of Environmental and Natural ResourcesZhejiang University of Science and TechnologyHangzhou 310023China State Key Laboratory of Biocontrol School of EcologyShenzhen Campus of Sun Yat-sen UniversityShenzhen 518107China Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment College of Environmental&Natural Resource SciencesZhejiang UniversityHangzhou 310058China State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products Ningbo UniversityNingbo 315211China Arable Soil Quality and Fertilizer Administration Bureau of Zhejiang Province Hangzhou 310020China

Soil contamination in agroecosystems remains a global environmental problem. Biochar has been suggested as an organic amendment to alleviate soil pollution, sequester carbon(C), and improve soil fertility. However, information on how bacterial and fungal communities in acidic bulk and rhizosphere soils respond to swine manure and its biochar is still lacking. In this study, biochar and swine manure were applied at two rates of 1.5 and 3 t ha-1in a rice-wheat rotation field to assess how soil characteristics, especially p H and chemical element availability, correlate to compositional variations of bacteria and fungi in bulk and rhizosphere soils. Our results showed that high rates of biochar and manure promoted the bacterial richness in bulk and rhizosphere soils by increasing soil pH and reducing soil arsenic(As) and copper(Cu) availability. Compared with soil As and Cu availability, soil p H had opposite effects on beta diversity of both the bacterial and fungal communities. Specifically, biochar and swine manure applications stimulated the bacterial classes Gemmatimonadetes, Deltaproteobacteria, and Gammaproteobacteria by increasing soil pH and decreasing soil available chemical elements. Opposite trends were observed in fungal communities responding to biochar and manure. For example, biochar restrained the fungal class Eurotiomycetes by decreasing soil As and Cu availability, but manure inhibited Leotiomycetes mainly because of an increase in soil pH and a decrease in soil dissolved organic C. These suggest that both bacterial and fungal communities respond significantly to biochar and manure amendments in both bulk and rhizosphere soils, possibly because of their sensitive adaptation to variations in soil environmental factors, such as pH level and chemical element availability.

关键词： bacteria chemical element element availability fungi rhizosphere soil dissolved organic C soil pH

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Hydrogen Sulfide Improves Rice Seed Germination by Regulating Aluminum Absorption,Internal Antioxidant Enzyme System and Osmotic Balance under Aluminum Toxicity Conditions

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Rice science 2023年第4期30卷 271-275,I0005-I0009页

作者： WEI Qianqian KONG Yali XIANG Xingjia ZHU Lianfeng LIU Jia TIAN Wenhao JIN Qianyu yu yijun ZHANG Junhua ZHU Chunquan State Key Laboratory of Rice Biology China National Rice Research Institute Anhui University Jiangxi Academy of Agricultural Sciences Zhejiang Cultivated Land Quality and Fertilizer Administration Station

Uncovering the mechanism of hydrogen sulfide(H2S)in improving rice seed germination under aluminum(Al)toxicity conditions is important for rice production in acidic *** the present study,an Al sensitive rice variety Kasalath was *** with 0.1 mmol/L sodium hydrosulfide(NaHS,H2S donor)under 70 mmol/L AlCl3(indicated as Al+NaHS treatment)increased rice seed germination by 27.95%,germination potential by 474.16%,and the germination index by 43.44%,compared with Al *** treatment of Al+NaHS reduced the Al content in rice seeds by 16.31%and 32.11%and increased the internal H2S content by 3.82%and 8.90%at 3 and 5 d of treatment,respectively,compared with Al ***+NaHS treatment significantly increased the activities of superoxide dismutase(SOD)。

关键词： Antioxidant treatment Internal

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Effects of dissolved organic matter from sewage sludge on sorption of tetrabromobisphenol A by soils

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Journal of Environmental Sciences 2008年第9期20卷 1075-1081页

作者： SUN Zhaohai MAO Li XIAN Qiming yu yijun LI Hui yu Hongxia State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing 210093 China Department of Crop and Soil Sciences Michigan State University East Lansing 48824 USA

Sorption of tetrabromobisphenol A (TBBPA) by soil influences its fate and transport in the environment. The presence of dissolved organic matter (DOM) may complicate the sorption process in soil. The effects of DOM from sewage sludge on TBBPA sorption by three soils were investigated using batch equilibration experiments in the study. DOM was observed to be sorbed on the soils and the isotherms could be fitted by the Langmuir model. The effects of DOM on TBBPA sorption were dependent on the characteristics ...

关键词： tetrabromobisphenol A (TBBPA) sorption dissolved organic matter pH soil sewage sludge

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Unveiling the time-temperature dependence of metastability of supercooled liquid using nano-calorimetry

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Science China(Physics,Mechanics & Astronomy) 2024年第3期67卷 119-127页

作者： yijun Ding Lijian Song Zheng Wang Ruiqi yu Junqiang Wang Lina Hu yuanzheng yue Edgar D.Zanotto Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) Shandong University Jinan 250061China Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201China Key Laboratory of Experimental Teratology Shandong University Jinan 250061 China Department of Chemistry and Bioscience Aalborg UniversityAalborg 9220Denmark Department of Materials Engineering Federal University of Sao CarlosSao Carlos SP 13.565-905Brazil

There is a lack of understanding of both the conversion of an unstable glass into a metastable supercooled liquid(MSL) upon heating and the metastability of MSLs. In this study, we investigated the time-and temperature-dependent metastability of an MSL using an advanced nano-calorimetric technique. The chosen Au-based metallic glass(Au MG) allowed adequate probing of its MSL in a temperature range between 10 and 70 K above the standard glass transition temperature. We found that the survival time of the MSL state is a quadratic function of temperature. Beyond this duration threshold, the sample undergoes fast crystallization even if it is below the crystallization temperature that is measured using differential scanning *** transmission electron microscopy, we observed the formation of clusters with a partially ordered lattice structure during relaxation in the Au MG sample fabricated using a nano-calorimeter. The atomic ordering within the clusters was enhanced by increasing time and temperature in the MSL region. Once the as-produced glass entered the MSL stage upon heating followed by a quenching stage at a given rate, the mechanical properties of the quenched glass remained the same regardless of its holding temperature and duration within the MSL region. This work provides insights into the glass-MSL-crystal transformation and offers guidance for designing standard metallic glasses for property characterizations.

关键词： metallic glass supercooled liquid relaxation nucleation nano calorimetric technology

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