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SSRN 2023年

作者： Peng, Jin Zou, Guisheng Huo, Jinpeng Xiao, Yu Sun, Tianming Li, Zehua Feng, Bin Liu, Lei Department of Mechanical Engineering State Key Laboratory of Tribology Key Laboratory for Advanced Manufacturing by Materials Processing Technology Ministry of Education of PR China Tsinghua University Beijing100084 China Taiyuan University of Technology Taiyuan030024 China

Self-powered photodetectors hold great promise for addressing power-related challenges in the "Internet of Things (IoT)"era. However, the self-powered performances of a metal-semiconductor-metal (MSM) structure photodetector are inherently limited due to the presence of the symmetric Schottky contacts, leading to canceling photocurrents in opposite directions, while constructing an asymmetric MSM structure demands complicated design or sustained external fields. Herein, we propose a novel in situ contact engineering strategy based on localized femtosecond (fs) laser irradiation, achieving an asymmetric band structure in an MSM-structure photodetector with pristine symmetric Schottky contacts. As a result, a MoS2 photodetector that exhibits exceptional photoresponse and self-powered performances is successfully fabricated. The device type transitions from a photoconductor to a photodetector, exhibiting a significant improvement in the rectification ratio from 1 to >104. A comprehensive study on fs laser-based contact engineering is conducted by investigating atom diffusion, element variation, and Schottky barrier height variation. Notably, the photodetector demonstrates an exceptional zero-bias responsivity of 1.72A/W, with a short circuit current of 37.2nA and maximum output electric power of 1.67nW. Our work provides a new strategy for modifying the energy band structure and facilitates the fabrication of high-performance self-powered photodetectors. © 2023, The Authors. All rights reserved.

关键词： Femtosecond lasers

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Application of single-cell Raman-deuterium isotope probing to reveal the resistance of marine ammonia-oxidizing archaea SCM1 against common antibiotics

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Chemosphere 2024年 362卷 142500页

作者： Kong, Lingchao Wang, Yi Cui, Dongyu He, Wei Zhang, Chuanlun Zheng, Chunmiao State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control Southern University of Science and Technology Guangdong Shenzhen518055 China Shenzhen Key Laboratory of Marine Archaea Geo-Omics Department of Ocean Science and Engineering Southern University of Science and Technology Shenzhen518055 China Eastern Institute for Advanced Study Eastern Institute of Technology Ningbo315200 China

Antimicrobial resistance (AMR) in oceans poses a significant threat to human health through the seafood supply chain. Ammonia-oxidizing archaea (AOA) are important marine microorganisms and play a key role in the biogeochemical nitrogen cycle around the world. However, the AMR of marine AOA to aquicultural antibiotics is poorly explored. Here, Raman-deuterium isotope probing (Raman-DIP), a single-cell tool, was developed to reveal the AMR of a typical marine species of AOA, Nitrosopumilus maritimus (designated SCM1), against six antibiotics, including erythromycin, tetracycline, novobiocin, neomycin, bacitracin, and vancomycin. The D2O concentration (30% v/v) and culture period (9 days) were optimized for the precise detection of metabolic activity in SCM1 cells through Raman-DIP. The relative metabolic activity of SCM1 upon exposure to antibiotics was semi-quantitatively calculated based on single-cell Raman spectra. SCM1 exhibited high resistance to erythromycin, tetracycline, novobiocin, neomycin, and vancomycin, with minimum inhibitory concentration (MIC) values between 100 and 400 mg/L, while SCM1 is very sensitive to bacitracin (MIC: 0.8 mg/L). Notably, SCM1 cells were completely inactive under the metabolic activity minimum inhibitory concentration conditions (MA-MIC: 1.6–800 mg/L) for the six antibiotics. Further genomic analysis revealed the antibiotic resistance genes (ARGs) of SCM1, including 14 types categorized into 33 subtypes. This work increases our knowledge of the AMR of marine AOA by linking the resistant phenome to the genome, contributing to the risk assessment of AMR in the underexplored ocean environment. As antibiotic resistance in marine microorganisms is significantly affected by the concentration of antibiotics in coastal environments, we encourage more studies concentrating on both the phenotypic and genotypic antibiotic resistance of marine archaea. This may facilitate a comprehensive evaluation of the capacity of marine microorganisms t

关键词： Antibiotics

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Effect of rejuvenation heat treatment on serrated flow behavior and fracture mechanism of nickel-based superalloys

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Transactions of Nonferrous Metals Society of China 2025年第5期35卷 1603-1618页

作者： Jia-jian WANG Zhe-wen HAN Zhi-chun WANG Bo PENG Yue ZUO Ju KANG School of Mechanical Engineering Beijing Institute of Petrochemical Technology Beijing 102617 China North China Electric Power Research Institute Co. Ltd. Beijing 100045 China Welding Institute Central Iron & Steel Research Institute Beijing 100081 China Hydrogen Energy Research Centre Beijing Institute of Petrochemical Technology Beijing 102617 China State Key Laboratory of Tribology in Advanced Equipment Tsinghua University Beijing 100084 China

The effects of rejuvenation heat treatment (RHT) on the serrated flow behavior and fracture mode of nickel- based superalloys (R26) were investigated by tensile tests and microstructural characterization. The serrated flow activation energies were determined to be 41−72 and 64−81 kJ/mol before and after RHT, respectively. Dynamic strain aging in the alloy is caused by the diffusion of carbon atoms into dislocation channels in the nickel matrix. Before RHT, carbides are concentrated at the grain boundaries. Cracks initiate from these carbides and propagate along the grain boundaries. RHT dissolves carbides at grain boundaries, transferring crack initiation to the precipitated phase group in the grains. RHT increases carbon atom concentration in the nickel matrix, enhancing dynamic strain aging and serrated flow behavior.

关键词： rejuvenation heat treatment nickel-based superalloy serrated flow behavior fracture activation energy

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Continuous synthesis of extremely small-sized iron oxide nanoparticles used for T_(1)-weighted magnetic resonance imaging via a fluidic reactor

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Science China Materials 2022年第6期65卷 1646-1654页

作者： Yu Mao Yan Li Fengchao Zang Haoli Yu Sen Yan Qingsong Song Zhiguo Qin Jianfei Sun Bo Chen Xiao Huang Ning Gu State Key Laboratory of Bioelectronics Jiangsu Key Laboratory for Biomaterials and DevicesSchool of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096China Jiangsu Key Laboratory of Molecular and Functional Imaging Medical SchoolSoutheast UniversityNanjing 210096China State Key Laboratory of Flexible Electronics&Institute of Advanced Materials Jiangsu National Synergistic Innovation Center for Advanced MaterialsNanjing Tech UniversityNanjing 210096China Materials Science and Devices Institute Suzhou University of Science and TechnologySuzhou 215009China

Extremely small-sized iron oxide nanoparticles(ESIONPs)with sizes less than 5 nm have shown great promise as T_(1)contrast agents for magnetic resonance imaging(MRI).However,their facile and scalable production with simultaneously endowed biocompatible surface chemistry remains difficult to be *** this study,by using the coprecipitation method implemented in a specially designed gas/liquid mixed phase fluidic reactor,polyglucose sorbitol carboxymethyether(PSC)coated ESIONPs were continuously synthesized with controllable particle sizes ranging from 1.8 to 4 *** the differently sized ESIONPs,the 3.7-nm ESIONPs exhibit the best performance as T_(1)MRI contrast agent,featuring a high r_(1) value of 4.11(mmol L^(−1))^(−1)s^(−1)and low r_(2)/r_(1) ratio of 7.90 under a clinical 3 T MR scanning,as well as the excellent T_(1)MRI contrast effect in not only water but also the cellular environment and blood ***,the ESIONPs possess long-term stability and good dispersity in aqueous dispersions,making them ideal candidates as safe and effective T_(1)-weighted MRI contrast agent for real clinical use.

关键词： ESIONPs T1-contrast agents MRI coprecipitation method gas/liquid mixed phase fluidic reactor

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Phase thermal stability and mechanical properties analyses of(Cr,Fe,V)–(Ta,W)multiple-based elemental system using a compositional gradient film

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International Journal of Minerals,Metallurgy and Materials 2020年第10期27卷 1379-1387页

作者： Qiu-wei Xing Jiang Ma Yong Zhang Beijing Advanced Innovation Center of Materials Genome Engineering State Key Laboratory of Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen 518060China

High-entropy alloys(HEAs)generally possess complex component combinations and abnormal *** traditional methods of investigating these alloys are becoming increasingly inefficient because of the unpredictable phase transformation and the combination of many *** development of compositionally complex materials such as HEAs requires high-throughput experimental methods,which involves preparing many samples in a short *** we apply the high-throughput method to investigate the phase evolution and mechanical properties of novel HEA film with the compositional gradient of(Cr,Fe,V)-(Ta,W).First,we deposited the compositional gradient film by ***,the mechanical properties and thermal stability of the(Cr0.33Fe0.33V0.33)x(Ta0.5W0.5)100−x(x=13-82)multiplebased-elemental(MBE)alloys were *** the deposited wafer was annealed at 600℃for 0.5 h,the initial amorphous phase was transformed into a body-centered cubic(bcc)structure phase when x=*** were observed on the film surface when x was 72 and ***,the highest hardness of as-deposited films was found when x=18,and the maximum hardness of annealed films was found when x=33.

关键词： high-throughput fabrication hard coating thermal resistance mechanical property phase stability high-entropy alloys

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Application of Fuzzy Interpolation Reasoning in Welding Process Decision 32nd

Application of Fuzzy Interpolation Reasoning in Welding Proc...

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32nd International Ocean and Polar engineering Conference, ISOPE 2022

作者： Pan, Zufu Feng, Zhiqiang Qin, Haijian Jiao, Ziquan Yuan, Hao Li, Xin School of Mechamical Engineering Guangxi University Guangxi Nanning China Guangxi Engineering Technology Research Center of Ship Digital Design and Advanced Manufacturing Beibu Gulf University Guangxi Qinzhou China State Key Laboratory of Hydraulic Engineering Simulation & Safety Tianjin University Tianjin China

ISBN: (纸本)9781880653814

Welding is a highly nonlinear, time-varying and multi coupling typical complex process. When using the traditional fuzzy reasoning method to make decision on welding parameters, it is difficult to build an accurate and complete welding process parameter rule base due to the uncertainty and complexity of the welding process. When the given input value cannot match the rules in the rule base, the reasoning conclusion cannot be drawn. In order to solve this limitation, this paper proposes a welding process parameter decision-making method, which is achieved by fuzzy rule interpolation. It can predict and decide welding parameters when the welding process parameter rule base is sparse. The experimental results show that the model can achieve high accuracy. © 2022 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Decision making

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Evolution of electromechanical properties in Fe-doped(Pb,Sr)(Zr,Ti)O_(3) piezoceramics

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Journal of advanced Ceramics 2021年第3期10卷 587-595页

作者： Chuan CHEN Yan WANG Zong-Yue LI Chun LIU Wen GONG Qing TAN Bing HAN Fang-Zhou YAO Ke WANG Joint Laboratory of Electric Power Intelligent Sensing Technology and Application Department of Sensing Technology for Electric PowerGlobal Energy Interconnection Research Institute Co.Ltd.Future Science ParkBeijing 102209China China Aerospace Science and Industry Corporation Beijing 100048China Naqu Branch of Tibet Electric Limited Company Naqu 852000China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Center of Advanced Ceramic Materials and Devices Yangtze Delta Region Institute of Tsinghua UniversityZhejiang 314006China Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China Department of Orthodontics&National Engineering Laboratory for Digital and Material Technology Peking University School and Hospital of StomatologyBeijing 100081China State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi'an 710049China Foshan(Southern China)Institute for New Materials Foshan 528200China

Defects in acceptor-doped perovskite piezoelectric materials have a significant impact on their electrical ***,the defect mediated evolution of piezoelectric and ferroelectric properties of Fe-doped(Pb,Sr)(Zr,Ti)O_(3)(PSZT-Fe)piezoceramics with different treatments,including quenching,aging,de-aging,and poling,was investigated *** vacancies with a cubic symmetry are preserved in the quenched PSZT-Fe ceramics,rendering them robust ferroelectric *** the aged PSZT-Fe polycrystals,defect dipole between Fe dopant and oxygen vacancy has the same orientation with spontaneous polarization Ps,which enables the reversible domain switching and hence leads to the emergence of pinched polarization hysteresis and recoverable strain *** the defect dipoles can be gradually disrupted by bipolar electric field cycling,once again endowing the aged materials with representative ferroelectric *** the poled PSZT-Fe polycrystals,the defect dipoles are reoriented to be parallel to the applied poling field,and an internal bias field aligning along the same direction emerges simultaneously,being responsible for asymmetric hysteresis loops.

关键词： lead-zirconate-titanate(PZT) piezoelectric acceptor defect engineering electromechanical properties

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Oxidation Behavior and Corrosion Mechanism of Sic Ceramics at High Temperatures in Wet Air Environment

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SSRN 2023年

作者： Yan, Shuaibin Duan, Xiaoming Cai, Delong He, Peigang Yang, Zhihua Jia, Dechang Lin, Hua-Tay Zhou, Yu Institute for Advanced Ceramics School of Materials Science and Engineering Harbin Institute of Technology Harbin China Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology Harbin Institute of Technology Harbin China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin150001 China Key Laboratory of Superlight Materials and Surface Technology Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University 145 Nantong Street Harbin150001 China School of Electromechanical Engineering Guangdong University of Technology Guangzhou510006 China

The oxidation behavior and corrosion mechanism of SiC ceramics were investigated at high temperatures between 1000 and 1200 ℃ in wet environments (75% water/25% air). Experimental results showed that protective SiO2 layers formed at 1000 and 1100 ℃. Whereas, the oxidation and water vapor corrosion proceed simultaneously at 1200 ℃, resulting in a significant weight loss. Consequently, a porous layer of 30 μm formed after 10 hours oxidation. The calculated activation energy based on the oxide layer thickness data versus time curves was 109 kJ/mol, which was lower than the values reported in dry air environments. © 2023, The Authors. All rights reserved.

关键词： Oxidation

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Important mesoscale phenomena in gas phase fluidized bed ethylene polymerization

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Particuology 2020年第1期18卷 116-143页

作者： Jingyuan Sun Haotong Wang Sihang Tian Xiaoqiang Fan Qiang Shi Ying Liu Xiaobo Hu Yao Yang Jingdai Wang Yongrong Yang Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology Hangzhou 310027China College of Chemical and Biological Engineering Zhejiang UniversityHangzhou 310027China State Key Laboratory of Chemical Engineering Zhejiang UniversityHangzhou 310027China

Gas phase fluidized bed processes have been widely applied to polyethylene *** these processes,the flow,mass transfer,and reaction rate on the microscale and macroscale are strongly coupled because of the multiphase and multiscale nature of the fluidization *** mesoscale phenomena is therefore essential to the quantitative translation of the knowledge obtained from the microscale to the *** paper reviews the development of ethylene polymerization gas phase processes while focussing on studies regarding mesoscale *** include experimental characterizations,mathematical modelling and control *** and future developments in this field are also discussed.

关键词： Gas phase fluidized bed process Mesoscale phenomena Cloudy zone Experimental characterization Mathematical modelling Control strategy

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Enhanced Li-Ion Battery Performance Based on Multisite Oxygen Vacancies in Wo3-X@Rgo Negative Electrode

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SSRN 2024年

作者： Li, Zihao Yang, Xijia Yang, Yue Li, Xuesong Gao, Yang Wang, Liying Lü, Wei Key Laboratory of Advanced Structural Materials Ministry of Education & Advanced Institute of Materials Science School of Materials Science and Engineering Changchun University of Technology Changchun130012 China State Key Laboratory of Luminescence and Applications Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun130033 China

While transition-metal oxides have emerged as promising candidates for lithium energy storage, several issues are remained to be addressed such as low conductivity, rate performance, and recyclability. In this study, a three-dimensional interconnected sheet-like heterostructure of WO3-x coated with reduced graphene oxide (rGO) was synthesized using the hydrothermal method. This structure significantly enhanced the conductivity of WO3-x. By combining the heterojunction with oxygen vacancies, the active sites are enlarged, promoting the effective movement of ions and electrons at the interface between the two materials. The WO3-x@rGO anode exhibits a high specific capacity of 1202.6 mAh g-1 at 0.1 A g-1, with a cycling retention rate of 96% after 100 cycles. Meanwhile, even at 1 A g-1, it still maintains a capacity of 305 mAh g-1 after 500 cycles. Theoretical calculations reveal that the presence of the composite heterogeneous structure enables WO3-x@rGO to possess appropriate adsorption energy, lower work function, and reduced barriers. This arrangement provides abundant active sites, promoting the rapid penetration of the electrolyte and enhancing the interface reaction kinetics, which is consistent with the experimental results. This study offers a new strategy for Li-ion anode materials. © 2024, The Authors. All rights reserved.

关键词： Lithium-ion batteries

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