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Biaxial tensile behavior of CoCrFeNi high-entropy alloy under dynamic and proportional loadings

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Chinese Journal of Aeronautics 2024年第9期37卷 475-489页

作者： Haoyang LI Liqiang GAO lin QI Yajing FENG Jingyu WANG Yulong LI qifeng YU School of Aeronautics.Northwestern Polytechnical University Xiana 710072China Shaanxi Key Laboratory of Impact Dynamics and Engineering Applications Northwestern Polytechnical UniversityXian 710072 China School of Civil Aviation Northwestern Polytechnical UniversitySuzhou 215699China NPU Yangzi River Delta Research Institute Suzhou 215400China

The dynamic failure behavior of CoCrFeNi High-Entropy Alloy(HEA)under plane biaxial stress was investigated in *** dynamic biaxial tensile tests were conducted using an Electromagnetic Biaxial Split Hopkinson Tensile Bar(EBSHTB)*** comparison,the quasi-static uniaxial and biaxial tensile tests,as well as dynamic uniaxial tensile tests,were per-formed respectively.A cruciform specimen suitable for large plastic deformation was designed and employed in the *** Finite Element Method(FEM)verified that the improved cruciform specimen could satisfy the basic *** feasibility of the proposed specimen was further confirmed through loading ***,the quasi-static and dynamic yield loci of the HEA in the first quadrant of the principal stress space were *** results indicate that the alloy exhibits obvious strain hardening effect and strain rate strengthening effect,the yield locus and plastic work contours can be accurately described by Hill'48 criterion.

关键词： High-entropy alloys Biaxial tensile test Cruciform specimen Electromagnetic split Hop-kinson bar Digital image correlation

Analysis of influence of heat exchangerfouling on heat transfer performancebased on thermal fluid coupling

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排灌机械工程学报 2023年第7期41卷 695-700页

作者： HUANG Si MURAD Tariq NIU qifeng lin Guangtang CHEN Jianxun School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhouGuangdong 510641China Guangdong Institute of Special Equipment Inspection and Research Zhuhai Branch ZhuhaiGuangdong 519002China

A study on heat transfer performance by thermal fluid coupling simulation for the fouling in a shell-tube heat exchanger used in engineering was presented. The coupling simulation was performed in a fluid and solid domains under three different fouling conditions: fouling inside the tube, fouling outside the tube, and fouling inside the shell. The flow field, temperature, and pressure distributions in the heat exchanger were solved numerically to analyze the heat transfer performance parameters, such as thermal resistance. It is found that the pressure drop of the heat exchanger and the thermal resistance of the tube wall increase by nearly 30% and 20%, respectively, when the relative fouling thickness reaches 10%. The fouling inside the tube has more impact on the heat transfer performance of the heat exchanger, and the fouling inside the shell has less impact.

关键词： shell-tube heat exchanger thermal fluid coupling fouling thermal resistance heat transfer analysis

FY-3E:The First Operational Meteorological Satellite Mission in an Early Morning Orbit

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Advances in Atmospheric Sciences 2022年第1期39卷 1-8页

作者： Peng ZHANG Xiuqing HU qifeng LU Aijun ZHU Manyun lin ling SUN lin CHEN Na XU Innovation Center for Fengyun Meteorological Satellite National Satellite Meteorological CenterChina Meteorological AdministrationBeijing 100081China

Fengyun-3 E(FY-3E),the world’s first early-morning-orbit meteorological satellite for civil use,was launched successfully at the Jiuquan Satellite Launch Center on 5 July *** FY-3E satellite will fill the vacancy of the global early-morning-orbit satellite observation,working together with the FY-3C and FY-3D satellites to achieve the data coverage of early morning,morning,and afternoon *** combination of these three satellites will provide global data coverage for numerical weather prediction(NWP)at 6-hour intervals,effectively improving the accuracy and time efficiency of global NWP,which is of great significance to perfect the global earth observing *** this article,the background and meteorological requirements for the early-morning-orbit satellite are reviewed,and the specifications of the FY-3E satellite,as well as the characteristics of the onboard instrumentation for earth observations,are also *** addition,the ground segment and the retrieved geophysical products are also *** is believed that the NWP communities will significantly benefit from an optimal temporal distribution of observations provided by the early morning,mid-morning,and afternoon satellite *** benefits are expected in numerous applications such as the monitoring of severe weather/climate events,the development of improved sampling designs of the diurnal cycle for accurate climate data records,more efficient monitoring of air quality by thermal infrared remote sensing,and the quasicontinuous monitoring of the sun for space weather and climate.

关键词： FY-3E operational meteorological satellite early morning orbit

A hybrid flexible gas sensory system with perceptual learning

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Nano Research 2022年第1期15卷 423-428页

作者： qifeng Lu Fuqin Sun Yanbing Dai Yingyi Wang lin Liu Zihao Wang Shuqi Wang Ting Zhang i-lab Key Laboratory of multifunctional nanomaterials and smart systemsSuzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of Sciences(CAS)Suzhou 215123China Department of Health and Environmental Sciences Xian Jiaotong-Liverpool UniversitySuzhou 215123China

Imbuing artificial sensory system with intelligence of the biological counterpart is limited by challenges in emulating perceptual learning ability at the device *** biological systems,stimuli from the surrounding environment are detected,transmitted,and processed by receptor,afferent nerve,and brain,*** process allows the living creatures to identify the potential hazards and improve their adaptability in various ***,inspired by the biological olfaction system,a gas sensory system with perceptual learning is *** a proof-of-concept,H2S gas with various concentrations is used as the stimulation and the stimuli will be converted to pulse-like physiological signals in the designed system,which consists of a gas sensor,a flexible oscillator,and a memristor-type artificial ***,the learning ability is implemented using a supervised learning method based on k-nearest neighbors(KNN)*** recognition accuracy can be enhanced by repeating training,illustrating a great potential to be used as the neuromorphic sensory system with a learning ability for the applications in robotics.

关键词： flexible electronics artificial synapses perceptual learning sensory systems cognitive functions

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基于数据驱动的水轮机调速系统健康状态预测

水电与新能源 2017年第10期31卷 51-55页

作者：林秉良蔡维由蔡天富周绮凤陈启明林茂张强华电福新能源股份有限公司古田溪水力发电厂福建古田352258 武汉大学动力与机械学院湖北武汉430072 厦门大学航天航空学院福建厦门361005 武汉四创自动控制技术有限责任公司湖北武汉430070

水轮机调速系统是水轮发电机组的关键控制系统。运用故障树与专家系统相结合的方法对调速系统可能发生的故障进行诊断,并基于历史数据,挖掘与故障相关的可能因素,对专家系统无法解决的故障进行分析,构建了基于数据驱动的水轮机调速系统... 详细信息

水轮机调速系统是水轮发电机组的关键控制系统。运用故障树与专家系统相结合的方法对调速系统可能发生的故障进行诊断,并基于历史数据,挖掘与故障相关的可能因素,对专家系统无法解决的故障进行分析,构建了基于数据驱动的水轮机调速系统健康状态预测系统。

关键词：水轮机调速系统健康状态预测专家系统故障树数据挖掘

Two-Dimensional Materials for Highly Efficient and Stable Perovskite Solar Cells

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Nano-Micro Letters 2024年第10期16卷 176-212页

作者： Xiangqian Shen Xuesong lin Yong Peng Yiqiang Zhang Fei Long qifeng Han Yanbo Wang Liyuan Han State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240People's Republic of China Xinjiang Key Laboratory of Solid State Physics and Devices School of Physical Science and TechnologyXinjiang UniversityUrumqi 830046People's Republic of China Special Division of Environmental and Energy Science College of Arts and SciencesKomaba Organization for Educational ExcellenceUniversity of TokyoTokyo 153-8902Japan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People's Republic of China College of Chemistry Henan Institute of Advanced TechnologyZhengzhou UniversityZhengzhou 450001People's Republic of China Guangxi Key Laboratory of Optical and Electronic Materials and Devices Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of ResourcesSchool of Materials Science and EngineeringGuilin University of TechnologyGuilin 541004People's Republic of China

Perovskite solar cells(PSCs)offer low costs and high power conversion ***,the lack of long-term stability,primarily stemming from the interfacial defects and the sus-ceptible metal electrodes,hinders their practical *** the past few years,two-dimensional(2D)materials(e.g.,graphene and its derivatives,transitional metal dichalcogenides,MXenes,and black phosphorus)have been identified as a promising solution to solving these problems because of their dangling bond-free surfaces,layer-dependent electronic band structures,tunable functional groups,and inherent ***,recent progress of 2D material toward efficient and stable PSCs is summarized,including its role as both interface materials and *** discuss their beneficial effects on perovskite growth,energy level alignment,defect passivation,as well as blocking external *** particular,the unique properties of 2D materials to form van der Waals heterojunction at the bottom interface are ***,perspectives on the further development of PSCs using 2D materials are provided,such as designing high-quality van der Waals heterojunction,enhancing the uniformity and coverage of 2D nanosheets,and developing new 2D materials-based electrodes.

关键词： Perovskite solar cells Two-dimensional materials Interface engineering Van der Waals heterojunction Electrodes

Fringe-contoured-window sine/cosine filter for saw-tooth phase maps in ESPI

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Frontiers of Optoelectronics 2008年第Z2期1卷 345-351页

作者： Sihua FU Xuejun LONG Hui lin qifeng YU College of Opto-electronic Science and Engineering National University of Defense Technology Institute of Space and Earth Information Science The Chinese University of Hong Kong

In electronic speckle pattern interferometry(ESPI), because saw-tooth phase map obtained by phaseshifting is inherently full of speckle noise, noise reduction should be carried out to suppress high-level noise before it is unwrapped. In accordance with the feature of the saw-tooth phase map, an adaptive filter method combining the classical sine/cosine filter and the fringe orientation information of the phase map is developed. A fringe orientation map is first generated from the saw-tooth phase map, and then a fringe-contoured window is derived accordingly. Finally,filtering is carried out within the window. Compared with existing filters, it has a better performance on phase jump information preservation without any blurring effect on phase distribution provided that filtering is implemented on the equal-phase window. Moreover, its capability for noise reduction is more powerful. The effectiveness and advantages of the novel filter have been also verified by both simulated and real saw-tooth phase maps.

关键词： optical measurement electronic speckle pattern interferometry (ESPI) phase-shifting saw-tooth phase map filtering

Stable perovskite solar cells with 23.12% efficiency and area over 1 cm^(2) by an all-in-one strategy

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Science China Chemistry 2022年第7期65卷 1321-1329页

作者： Hongzhen Su Xuesong lin Yanbo Wang Xiao Liu Zhenzhen Qin Qiwei Shi qifeng Han Yiqiang Zhang Liyuan Han State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240China Special Division of Environmental and Energy Science Komaba Organization for Educational Excellence(KOMEX)College of Arts and SciencesUniversity of TokyoTokyo 153-8902Japan School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China SJTU-Paris Elite Institute of Technology Shanghai Jiao Tong UniversityShanghai 200240China School of Materials Science and Engineering Henan Institute of Advanced TechnologyZhengzhou UniversityZhengzhou 450001China

To realize the commercialization of perovskite solar cells(PSCs), it is required to overcome the remaining challenges in device enlargement and operational stability. Here, we report an all-in-one strategy by integrating the oxidation of hole-transport material(HTM) with the formation of the passivation layer, which simultaneously solved the stability issues caused by HTM oxidation and realized the uniform defects in passivation over a large area. The resulting devices achieved a certified PCE of23.12% on average with an aperture area of 1.04 cm^(2) and are reproducible with high operational stability because of the exclusion of air exposure, hygroscopic Li-TFSI, and the lithium-based wastes, maintaining ca. 90% of their initial PCEs after operation at the maximum power point under continuous 1 sun illumination for 1,600 h. Our strategy simplifies the fabrication process of PSCs, which is compatible with commercial-scale methods, offering facile access to efficient and stable large-area PSCs.

关键词： perovskite solar cells oxidation of hole-transport materials uniform defects passivation

Precise design strategies of nanomedicine for improving cancer therapeutic efficacy using subcellular targeting

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Signal Transduction and Targeted Therapy 2020年第1期5卷 279-293页

作者： Xianglei Fu Yanbin Shi Tongtong Qi Shengnan Qiu Yi Huang Xiaogang Zhao qifeng Sun Guimei lin Department of Pharmaceutics Key Laboratory of Chemical Biology(Ministry of Education)School of Pharmaceutical SciencesCheeloo College of MedicineShandong UniversityJinan 250012 ShandongChina School of Mechanical and Automotive Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353 ShandongChina The Second Hospital Cheeloo College of MedicineShandong UniversityJinan 250033 ShandongChina

Therapeutic efficacy against cancer relies heavily on the ability of the therapeutic agents to reach their final *** optimal targets of most cancer therapeutic agents are usually biological macromolecules at the subcellular level,which play a key role in ***,to improve the therapeutic efficiency of drugs,researchers need to focus on delivering not only the therapeutic agents to the target tissues and cells but also the drugs to the relevant subcellular *** this review,we discuss the most recent construction strategies and release patterns of various cancer cell subcellular-targeting nanoformulations,aiming at providing guidance in the overall design of precise ***,future challenges and potential perspectives are illustrated in the hope of enhancing anticancer efficacy and accelerating the translational progress of precise nanomedicine.

关键词： therapeutic drugs precise