检索结果-内蒙古大学图书馆

SSRN 2023年

作者： Jiang, Dabo Niu, Pan Tang, Cui Zhang, Mayin Meng, Wenyi Gao, Pingli Jin, Lingrui Su, Anqun Zhang, Guanghui Xu, Longjun Chongqing University of Arts and Sciences 319 Honghe Ave. Yongchuan Chongqing402160 China Hunan University of Medicine Huaihua418000 China State Key Laboratory of Fine Chemicals Frontier Science Center for Smart Materials PSU-DUT Joint Center for Energy Research School of Chemical Engineering Dalian University of Technology Dalian116024 China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Chongqing400044 China

This paper discloses a mild and atom-economic photo-oxidation protocol for visible-light-driven quantitative oxidation of anthracene (AN) to anthraquinone (AQ), which can obtain excellent AN conversion (~100%) and AQ yield (99.2%) without any catalysts and additives under 10 h of visible light illumination. In addition, the protocol also works well with other chemical molecules that have a similar structure. In this protocol, AN is directly oxidized from AN to AQ without the observation of the intermediate anthrone (AO). Based on a series of control tests, as well as free radical quenching and electron paramagnetic resonance (EPR) spin trapping studies, it can be inferred that the process of photo-oxygenation in AN is most likely initiated by its photo-excited state, denoted as AN*. This photo-excited state has the ability to activate molecular oxygen (O2) by an electron transfer mechanism, resulting in the formation of a superoxide free radical (O2•-). Following this, the process of photo-oxidation is progressively controlled by the oxygenated product AQ, which acts as an active photo-catalyst. AQ is derived from the oxidation of AN by O2•- and its presence accelerates the process of photo-oxidation due to its rapid accumulation. Furthermore, the yield of AQ can be improved by enhancing the light intensity of the light source, timely separating the yellow solid oxidation product AQ formed during the reaction, and pre-adding the oxidation product AQ to the protocol as an active photocatalyst. © 2023, The Authors. All rights reserved.

关键词： Free radicals

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Commensurate and Incommensurate Chern Insulators in Magic-angle Bilayer Graphene

arXiv

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arXiv 2024年

作者： Zhang, Zaizhe Yang, Jingxin Xie, Bo Feng, Zuo Zhang, Shu Watanabe, Kenji Taniguchi, Takashi Yang, Xiaoxia Dai, Qing Liu, Tao Liu, Donghua Liu, Kaihui Song, Zhida Liu, Jianpeng Lu, Xiaobo International Center for Quantum Materials School of Physics Peking University Beijing100871 China National Engineering Research Center of Electromagnetic Radiation Control Materials University of Electronic Science and Technology of China Chengdu611731 China School of Physical Science and Technology ShanghaiTech University Shanghai201210 China State Key Laboratory for Mesoscopic Physics Frontiers Science Centre for Nano-optoelectronics School of Physics Peking University Beijing100871 China CAS Key Laboratory of Nanophotonic Materials and Devices CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing100871 China Research Center for Electronic and Optical Materials National Institute of Material Sciences 1-1 Namiki Tsukuba305-0044 Japan Research Center for Materials Nanoarchitectonics National Institute of Material Sciences 1-1 Namiki Tsukuba305-0044 Japan School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai200240 China School of Materials and Energy University of Electronic Science and Technology of China Chengdu611731 China Collaborative Innovation Center of Quantum Matter Beijing100871 China Hefei National Laboratory Hefei230088 China

The interplay between strong electron-electron interaction and symmetry breaking can have profound influence on the topological properties of materials1–4. In magic angle twisted bilayer graphene (MATBG), the flat band with a single SU(4) flavor associated with the spin and valley degrees of freedom gains non-zero Chern number when C2z symmetry or C2zT symmetry is broken. Electron-electron interaction can further lift the SU(4) degeneracy, leading to the Chern insulator states5–14. Here we report a complete sequence of zero-field Chern insulators at all odd integer fillings (ν = ±1, ±3) with different chirality (C = 1 or -1) in hBN aligned MATBG which structurally breaks C2z symmetry. The Chern states at hole fillings (v = -1, -3), which are firstly observed in this work, host an opposite chirality compared with the electron filling scenario. By slightly doping the v = ±3 states, we have observed new correlated insulating states at incommensurate moiré fillings which is highly suggested to be intrinsic Wigner crystals according to our theoretical calculations. Remarkably, we have observed prominent Streda-formula violation around v = -3 state. By doping the Chern gap at v = -3 with notable number of electrons at finite magnetic field, the Hall resistance Ryx robustly quantizes to ~ h/e2 whereas longitudinal resistance Rxx vanishes, indicating that the chemical potential is pinned within a Chern gap, forming an incommensurate Chern insulator. By providing the first experimental observation of zero-field Chern insulators in the flat valence band, our work fills up the overall topological framework of MATBG with broken C2z symmetry. Our findings also demonstrate that doped topological flat band is an ideal platform to investigate exotic incommensurate correlated topological states. © 2024, CC BY-NC-SA.

关键词： Degrees of freedom (mechanics)

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Vulnerability analysis of cyber-physical system based on improved structural entropy 4

Vulnerability analysis of cyber-physical system based on imp...

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4th IEEE Conference on energy Internet and energy System Integration, EI2 2020

作者： Li, Long Li, Zhenwen Liu, Ying Xiao, Zhenfeng Cai, Ye Liu, Fang Hunan Electric Power Company Dispatch Control Center State Grid Corporation Changsha China Changsha University of Science and Technology School of Electrical and Information Engineering Changsha China Hunan Electric Power Company Limited Economic Technical Research Institute Hunan Key Laboratory of Energy Internet Supply-demand and Operation Changsha China

ISBN: (纸本)9781728196060

With the continuous integration of the power grid and the information network, the vulnerability analysis of cyber-physical system considering the interaction between networks become more important. Based on the complex network theory, a topology model of power cyber-physical network is established, and improved structural entropy is proposed, which considering node differences, edge differences, and node dependency differences. Taking the hunan Electric Power Cyber-Physical System as an example, the simulation results show that the improved structural entropy can identify important nodes in the power grid. the dependent network is more vulnerable than a single network, nodes with high-degree and high-betweenness play a key role in maintaining the operation of the system, and the robustness of system will also be reduced when a few nodes with low-degree and low-betweenness fail. © 2020 IEEE.

关键词： Cyber Physical System

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Innovative research and Exploration on Cultivation of Plant Protection Talents Under the Mode of School-Enterprise collaborative Education

Innovative Research and Exploration on Cultivation of Plant ...

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作者： Kaifa Guo Chenzhong Jin Xiu Liu Xiaoming Ou Hongyan Liu Yunyun Zhou Collaborative Innovation Center for Farmland Weeds Control Hunan University of HumanitiesScience and Technology Hunan Research Institute of Chemical Industry/National Engineering Research Center for Agrochemicals/Hunan Provincial Key Laboratory of Agricultural Chemicals

School-enterprise collaborative education is one of the directions of China's higher education reform, and an important means of cultivating applied talents. This article analyzes the problems of schoolenterprise collaborative education, and proposes methods and measures for school-enterprise collaborative education based on the characteristics of plant protection talent training. Based on the school-enterprise collaborative education model, this article discusses the construction of a comprehensive assessment system with students as the main body, aiming at further improving the ability and quality of cultivation of plant protection professionals and meeting the social needs of plant protection professionals.

关键词： school-enterprise collaborative education plant protection talent training innovative research

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Structure development of carbon-based solar-driven water evaporation systems

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Science Bulletin 2021年第14期66卷 1472-1483,M0004页

作者： Wen He Lei Zhou Miao Wang Yang Cao Xuemei Chen Xu Hou State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Research Institute for Biomimetics and Soft Matter Fujian Provincial Key Laboratory for Soft Functional Materials ResearchJiujiang Research InstituteCollege of Physical Science and TechnologyXiamen UniversityXiamen 361005China College of Materials Xiamen UniversityXiamen 361005China MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing 210094China Collaborative Innovation Center of Chemistry for Energy Materials Xiamen UniversityXiamen 361005China Tan Kah Kee Innovation Laboratory Xiamen 361102China

Pressing need goes ahead for accessing freshwater in insufficient supply countries and regions,which will become a restrictive factor for human development and *** recent years,solar-driven water evaporation(SDWE)systems have attracted increasing attention for their specialty in no consume conventional energy,pollution-free,and the high purity of fresh *** particular,carbon-based photothermal conversion materials are preferred light-absorbing material for SDWE systems because of their wide range of spectrum absorption and high photothermal conversion efficiency based on superconjugate *** now,many carbon-based SDWE systems have been reported,and various structures emerged and were designed to enhance light absorption,optimize heat management,and improve the efficient water transport *** this review,we attempt to give a comprehensive summary and discussions of structure progress of the carbon-based SDWE systems and their working mechanisms,including carbon nanoparticles systems,single-layer photothermal membrane systems,bi-layer structural photothermal systems,porous carbon-based materials systems,and three dimensional(3D)*** these systems,the latest 3D systems can expand the light path by allowing light to be reflected multiple times in the microcavity to increase the light absorption rate,and its large heat exchange area can prompt more water to evaporate,which makes them the promising application *** hope our review can spark the probing of underlying principles and inspiring design strategies of these carbonbased SDWE systems,and further guide device optimizations,eventually promoting in extensive practical applications in the future.

关键词： Carbon-based evaporator Solar-driven Photothermal conversion Desalination Structure development

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Fabrication, Characterization, and Performance Evaluation of Bi2wo6/Tio2/Fe3o4 Photocatalyst Responding to Visible Light for Enhancing Bisphenol a Degradation

SSRN

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SSRN 2022年

作者： Song, Tiehong Gao, Yanjiao Ye, Jian Ohnuki, Toshihiko Li, Jinyao Yu, Xiaodan Key Laboratory of Songliao Aquatic Environment Ministry of Education Jilin Jianzhu University Changchun130118 China College of Civil Engineering and Architecture Liaoning University of Technology Jinzhou121001 China School of Resource Environment and Safety Engineering University of South China Hengyang421001 China Hengyang Key Laboratory of Soil Contamination Control and Remediation University of South China Hengyang421001 China Hunan Province Engineering Research Center of Radioactive Control Technology in Uranium Mining and Metallurgy University of South China Hengyang421001 China Laboratory for Advanced Nuclear Energy Institute of Innovative Research Tokyo Institute of Technology Tokyo152-8550 Japan

A novel magnetic Bi 2 WO 6 /TiO 2 /Fe 3 O 4 photocatalyst was synthesized by hydrothermal approach. The pattern, structure, elemental composition, light absorbing properties, and magnetism of Bi 2 WO 6 /TiO 2 /Fe 3 O 4 were characterized and analyzed. The performance, influencing factors, and mechanism of Bi 2 WO 6 /TiO 2 /Fe 3 O 4 towards bisphenol A (BPA) degradation were investigated and deduced. Addition of 1.25 g/L Bi/Ti/Fe2 (molar ratio of Bi 2 WO 6 :TiO 2 :Fe 3 O 4 =2:1:0.17) in the solution containing 10 mg/L BPA at pH 5.6 resulted in BPA removal up to 95%. The performance of Bi/Ti/Fe2 was stable for five cycles after extracted from the reacted solution by magnet. Photoexcited h + , •OH, and •O 2 - formed in the reaction mainly contributed to BPA degradation. The Bi/Ti/Fe2 composite was composed of a three-layer petal structure from outside to inside to be Bi 2 WO 6 , TiO 2 , and Fe 3 O 4 . This structure was conducive in forming a heterojunction between TiO 2 and Bi 2 WO 6 , inhibiting the merging of photoexcited e - and h + , and improving the photocatalytic efficiency. © 2022, The Authors. All rights reserved.

关键词： Titanium dioxide

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Disorder-induced pronounced magnetoresistive hysteresis in Josephson junctions

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Physical Review B 2025年第13期111卷 134513-134513页

作者： Yu Wu Daiqiang Huang Huanyu Zhang Anita Guarino Rosalba Fittipaldi Chao Ma Wenjie Hu Chang Niu Zhen Wang Weichao Yu Yuriy Yerin Antonio Vecchione Yang Liu Mario Cuoco Hangwen Guo Jian Shen State Key Laboratory of Surface Physics and Institute for Nanoelectronic Devices and Quantum Computing Fudan University Shanghai 200433 People's Republic of China Department of Physics Fudan University Shanghai 200433 People's Republic of China Shanghai Aerospace Control Technology Institute Shanghai 201109 People's Republic of China International Center for Quantum Materials Peking University Beijing 100871 People's Republic of China CNR-SPIN c/o Universitá di Salerno I-84084 Fisciano (SA) Italy College of Materials Science and Engineering Hunan University Changsha 410082 People's Republic of China Department of Physics University of Science and Technology of China Hefei Anhui 230026 Peoples Republic of China CNR-SPIN via del Fosso del Cavaliere 100 00133 Roma Italy Hefei National Laboratory Hefei 230088 People's Republic of China Zhangjiang Fudan International Innovation Center Fudan University Shanghai 201210 People's Republic of China Shanghai Research Center for Quantum Sciences Shanghai 201315 People's Republic of China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 People's Republic of China

The relation between superconductivity and time-reversal symmetry is one of the most fascinating problems in condensed-matter physics. Here we report an anomalous transport behavior in superconducting Josephson junctions induced by surface disorder. We fabricate vertical Josephson junctions using metallic superconductor (Al) and ion-bombarded Sr2RuO4. Below the superconducting transition temperature, we observe persistent magnetoresistive hysteresis behavior dependent on the disorder deposition time. Field- and temperature-dependent measurements suggest that the observed effects arise from disorder-induced anomalous flux in Sr2RuO4 which can be sensitively detected by superconducting Al. To account for the observed findings, we consider different physical scenarios such as interband surface pairing reconstruction, magnetic surface states, and vortex phases.

关键词： Hysteresis

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Ultrathin microcrystalline hydrogenated Si/Ge alloyed tandem solar cells towards full solar spectrum conversion

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Frontiers of Chemical Science and engineering 2020年第6期14卷 997-1005页

作者： Yu Cao Xinyun Zhu Xingyu Tong Jing Zhou Jian Ni Jianjun Zhang Jinbo Pang Key Laboratory of Modem Power System Simulation and Control&Renewable Energy Technology Northeast Electric Power UniversityJilin 132012China School of Electrical Engineering Northeast Electric Power UniversityJilin 132012China School of Chemical Engineering Northeast Electric Power UniversityJilin 132012China Key Laboratory of Photo-electronics Thin Film Devices and Technique of Tianjin Institute of Photo-electronic Thin Film Devices and TechnologyCollege of Electronic Information and Optical EngineeringNankai UniversityTianjin 300350China Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of Shandong Institute for Advanced Interdisciplinary Research(iAIR)University of JinanJinan 250022China

Thin film solar cells have been proved the next generation photovoltaic devices due to their low cost,less material consumption and easy mass *** them,micro-crystalline Si and Ge based thin film solar cells have advantages of high efficiency and ultrathin absorber *** individual junction devices are limited in photoelectric conversion efficiency because of the restricted solar spectrum range for its specific *** this work,w e designed a nd simulated a multi-junction solar cell with its four sub-cells selectively absorbing the full solar spectrum including the ultraviolet,green,red as well as near infrared range,respectively.B y tuning the G e content,the record efficiency of 24.80%has been realized with the typical quadruple junction structure of a-Si:H/a-Si0.9Ge0.1:H/μc-Si:H/μc-Si0.5Ge0.5:*** further reduce the material cost,thickness dependent device performances have been *** can be found that the design of total thickness of 4μm is the optimal device design in balancing the thickness a nd the *** the design of ultrathin quadruple junction device with total thickness of 2μm is the optimized device design regarding cost and long-term stability with a little bit more reduction in *** results indicated that our solar cells combine the advantages of low cost and high *** work may provide a general guidance rule of utilizing the full solar spectrum for developing high efficiency and ultrathin multi-junction solar cells.

关键词： thin films solar cells quadruple junction solar cell amorphous silicon silicon germanium alloy quantum efficiency

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Emerging contaminants:A One Health perspective

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The Innovation 2024年第4期5卷 140-170,139页

作者： Fang Wang Leilei Xiang Kelvin Sze-Yin Leung Martin Elsner Ying Zhang Yuming Guo Bo Pan Hongwen Sun Taicheng An Guangguo Ying Bryan WBrooks Deyi Hou Damian EHelbling Jianqiang Sun Hao Qiu Timothy MVogel Wei Zhang Yanzheng Gao Myrna JSimpson Yi Luo Scott XChang Guanyong Su Bryan MWong Tzung-May Fu Dong Zhu Karl JJobst Chengjun Ge Frederic Coulon Jean Damascene Harindintwali Xiankui Zeng Haijun Wang Yuhao Fu Zhong Wei Rainer Lohmann Changer Chen Yang Song Concepcion Sanchez-Cid Yu Wang Ali El-Naggar Yiming Yao Yanran Huang Japhet Cheuk-Fung Law Chenggang Gu Huizhong Shen Yanpeng Gao Chao Qin Hao Li Tong Zhang Natàlia Corcoll Min Liu Daniel SAlessi Hui Li Kristian KBrandt Yolanda Pico Cheng Gu Jianhua Guo Jianqiang Su Philippe Corvini Mao Ye Teresa Rocha-Santos Huan He Yi Yang Meiping Tong Weina Zhang Fidèle Suanon Ferdi Brahushi Zhenyu Wang Syed AHashsham Marko Virta Qingbin Yuan Gaofei Jiang Louis A.Tremblay Qingwei Bu Jichun Wu Willie Peijnenburg Edward Topp Xinde Cao Xin Jiang Minghui Zheng Taolin Zhang Yongming Luo Lizhong Zhu Xiangdong Li DamiàBarceló Jianmin Chen Baoshan Xing Wulf Amelung Zongwei Cai Ravi Naidu Qirong Shen Janusz Pawliszyn Yong-guan Zhu Andreas Schaeffer Matthias C.Rillig Fengchang Wu Gang Yu James M.Tiedje State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China Department of Chemistry Hong Kong Baptist UniversityHong KongChina HKBU Institute of Research and Continuing Education Shenzhen Virtual University ParkShenzhenChina Technical University of Munich TUM School of Natural SciencesInstitute of Hydrochemistry85748 GarchingGermany School of Resources&Environment Northeast Agricultural UniversityHarbin 150030China Climate Air Quality Research UnitSchool of Public Health and Preventive MedicineMonash UniversityMelbourneVICAustralia Faculty of Environmental Science&Engineering Kunming University of Science&TechnologyKunming 650500China Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria College of Environmental Science and EngineeringNankai UniversityTianjin 300350China Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control School of Environmental Science and EngineeringInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China Ministry of Education Key Laboratory of Environmental Theoretical Chemistry South China Normal UniversityGuangzhouGuangdong 510006China Department of Environmental Science Baylor UniversityWacoTXUSA Center for Reservoir and Aquatic Systems Research(CRASR) Baylor UniversityWacoTXUSA School of Environment Tsinghua UniversityBeijing 100084China School of Civil and Environmental Engineering Cornell UniversityIthacaNY 14853USA Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province Zhejiang University of TechnologyHangzhou 310014China School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Laboratoire d’Ecologie Microbienne Universite Claude Bernard Lyon 1UMR CNRS 5557UMR INRAE 1418VetAgro Sup69622 VilleurbanneFrance Department of Pla

Environmental pollution is escalating due to rapid global development that often prioritizes human needs over planetary *** global efforts to mitigate legacy pollutants,the continuous introduction of new substances remains a major threat to both people and the *** response,global initiatives are focusing on risk assessment and regulation of emerging contaminants,as demonstrated by the ongoing efforts to establish the UN’s Intergovernmental Science-Policy Panel on Chemicals,Waste,and Pollution *** review identifies the sources and impacts of emerging contaminants on planetary health,emphasizing the importance of adopting a One Health *** for monitoring and addressing these pollutants are discussed,underscoring the need for robust and socially equitable environmental policies at both regional and international *** actions are needed to transition toward sustainable pollution management practices to safeguard our planet for future generations.

关键词： pollution planet contaminants

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Widespread surface ozone reduction triggered by dust storm disturbance on ozone production and destruction chemistry

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Science Advances 2025年第19期11卷 eadr4297页

作者： Zhang, Yunjiang Li, Nan Tang, Keqin Wang, Ming Li, Haiwei Li, Ke Zheng, Bo Zhang, Qiang Gao, Meng Fang, Jie Zhang, Haoran Cui, Shijie Wang, Junfeng Chen, Mindong Liao, Hong Ge, Xinlei Hauglustaine, Didier Balkanski, Yves Ciais, Philippe Jiang, Guibin Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Joint International Research Laboratory of Climate and Environment Change School of Environmental Science and Engineering Nanjing University of Information Science and Technology Nanjing210044 China Laboratoire des Sciences du Climat et de l’Environnement CNRS-CEA-UVSQ Université Paris-Saclay Gif-sur-Yvette France Institute of Environment and Ecology Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen518055 China Min-istry of Education Key Laboratory for Earth System Modeling Department of Earth System Science Tsinghua University Beijing100084 China Department of Geography Hong Kong Baptist University 999077 Hong Kong School of Atmospheric Sciences Nanjing University Nanjing210033 China School of Environment and Energy Engineering Anhui Jianzhu University Hefei230601 China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China

Natural dust storms are associated with changes to atmospheric photochemical processes, including changes in surface ozone, a critical global air pollutant. Here, we quantified the change in surface ozone during dust storms for regions in China by using a synthesis of measurements and modeling approaches. Our results showed that notable reductions of the average ozone concentration (2.0 to 12.2 parts per billion by volume) were observed during the 12 dust storm events from 2016 to 2023, relative to predust storm levels. The chemical interactions of dust particles with ozone production processes played crucial roles in explaining approximately 13 to 35% of the observed ozone reduction, alongside the impact of intense meteorological disturbances on transport and formation of ozone. Among these interactions, the uptake of ozone, reactive nitrogen, and hydroperoxyl radical by dust particles could substantially contribute to the ozone suppression. This study highlighted the importance of interactions between severe dust pollution and atmospheric photochemistry. Copyright © 2025 The Authors, some rights reserved.

关键词： Synthesis (chemical)

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