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Ti_(3)C_(2)T_(x)-TiSe_(2) analogous heterostructure for flexible zinc ion battery

Journal of Materials science & technology 2023年第19期150卷 225-232页

作者： Li Wen Junjie Shi Qixiang Zhang Fei Wang Siliang Wang Shaojun Zhang Qiang Wang Ke Mao Fei Long Yihua Gao Center for Nanoscale Characterization&Devices(CNCD) School of Physics and Wuhan National Laboratory for Optoelectronics(WNLO)Huazhong University of Science and Technology(HUST)Wuhan 430074China Information Materials and Intelligent Sensing Laboratory of Anhui Province School of Integrated CircuitsAnhui UniversityHefei 230601China College of Materials Science and Engineering Guangxi Key Laboratory of Optical and Electronic Materials and DevicesGuilin University of TechnologyGuilin 541004China

Exploring zinc-free anode materials is one of the effective strategies to get the zinc dendrites problem of flexible zinc ion battery(ZIB)*** this work,an analogous heterostructure(AHS)is constructed from the excellent MXene(Ti_(3)C_(2)T_(x))and TiSe_(2) *** AHS not only possesses numerous diffu-sion paths and Zn^(2+)storage sites but also possesses a stable conductive network to accelerate charge transfer in the *** a collaborative advantage,electrochemical measurement results show that MXene/TiSe_(2) electrodes display an excellent specific capacity of 177.9 mAh g^(-1) at 0.10 A g^(-1) and a long-term cycling stability of 77.4%capacity retention after 400 *** computations further demon-strate the excellent performance of MXene/TiSe_(2) electrodes including desirable electronic conductivity and low Zn^(2+)migration *** assembled flexible ZIB not only delivers a good specific capacity of 42.2μAh cm^(-2) at 0.20 mA cm^(-2) and a competitive energy density of 37.4μWh cm^(-2) but also exhibits excellent flexibility and ***,after 400 cycles at 0.60 A g^(-1),flexible ZIB shows a capacity retention of 73.8%.This work gives a successful attempt to design 2D layered materials as Zn metal-free anode for flexible ZIB.

关键词： Flexible zinc ion battery Analogous heterostructure Zinc dendrite Zinc free metal anode MXene flakes TiSe_(2)nanosheets

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Highly Sensitive SAW Pressure Sensor Based on Simply Supported Beam 4

Highly Sensitive SAW Pressure Sensor Based on Simply Support...

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2023 4th International Conference on Electrical, Electronic Information and Communication Engineering, EEICE 2023

作者： Yang, Yuntao Peng, Bin Sun, Zhaofeng Huang, Fei Zhang, Wanli National Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu610054 China

In this work, a SAW pressure sensor based on a simply supported beam was designed and fabricated. The SAW resonator deposited on 128° YX-lithium niobate (LNO) substrate was used as the sensing element. The LNO substrate was used as a simply supported beam, therefore strain transfer loss was avoided and uniaxial stress was directly applied to the SAW resonator. An indenter with two ledges was used to indent the LNO beam and then uniform strain was applied to the SAW resonator. The sensitivity was experimentally measured in a pressure range of 330 kPa. The results demonstrated that the sensitivity of the SAW pressure sensor in this work was as high as 2514 ppm/MPa. The high pressure sensitivity of the proposed SAW pressure sensor was analyzed. The device structure of the proposed SAW pressure sensor may help to design highly sensitive SAW pressure sensors. © Published under licence by IOP Publishing Ltd.

关键词： Niobium compounds

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Lifetime Evaluation of IGBTs Under PWM by a Physical Iterative Simulation Loop Based on the Crack Initiation and Propagation in Chip Solder Layer 17th

Lifetime Evaluation of IGBTs Under PWM by a Physical Iterati...

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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Huang, Yongle Luo, Yifei Xiao, Fei Liu, Binli Tang, Xing National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Hubei Wuhan430033 China

ISBN: (纸本)9789819904501

Solder fatigue is quite important for the reliability of IGBTs under thermal cycling. In this work, a Finite Elements Analysis-Fatigue Damage Calculation/Feedback (FEA-FDC) iterative looping was proposed for the evolution of micro-cracks in the solder layer of IGBTs. Secondly, the crack initiation and propagation in chip solder layer was investigated under power cycling (PC) by the iterative looping. Furthermore, the crack initiation and propagation in chip solder layer under lower temperature swings ( © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Insulated gate bipolar transistors (IGBT)

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Efficient reduction and adsorption of Cr(Ⅵ)using FeCl_(3)-modified biochar:Synergistic roles of persistent free radicals and Fe(Ⅱ)

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Journal of Environmental sciences 2024年第3期36卷 626-638页

作者： Shujie Hu Chengshuai Liu Hongling Bu Manjia Chen Ying-heng Fei National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and ManagementInstitute of Eco-environmental and Soil SciencesGuangdong Academy of SciencesGuangzhou 510650China State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of ScienceGuiyang 550081China School of Environment Science and Engineering Guangzhou UniversityGuangzhou 510006China College of Resources and Environment Chongqing SchoolUniversity of Chinese Academy of SciencesChongqing 400714China School of Environmental Science and Engineering Guangdong University of TechnologyGuangzhou 510006China

Transition metal iron and persistent free radicals(PFRs)both affect the redox properties of biochar,but the electron transfer relationship between them and the coupling reduction mechanism of Cr(Ⅵ)requires further *** untangle the interplay between iron and PFRs in biochar and the infuences on redox properties,FeCl_(3)-modified rice husk biochar(FBCs)was prepared and its reduction mechanism for Cr(Ⅵ)without light was *** FBCs had higher surface positive charges,oxygen-containing functional groups,and PFRs compared with pristine rice husk biochar(BC).Phenoxyl PFRs with high electrondonating capability formed in *** pronounced electron paramagnetic resonance signals showed that the PFRs preferred to form at lower Fe(Ⅲ)*** a high concentration of Fe(Ⅲ)would be reduced to Fe(Ⅱ)and consumed the formed *** kinetics and X-ray photoelectron spectroscopy analysis indicated that the FBCs effectively enhanced the Cr(Ⅵ)removal efficiency by 1.54-8.20 fold and the Cr(Ⅵ)reduction efficiency by 1.88-9.29 fold compared to those of *** quenching and competitive reductant addition experiments revealed that the higher Cr(Ⅵ)reduction performance of FBCs was mainly attributed to the formed PFRs,which could contribute to~74.0%of Cr(Ⅵ)reduction by direct or indirect electron *** PFRs on FBCs surfaces could promote the Fe(Ⅲ)/Fe(Ⅱ)cycle through single electron transfer and synergistically accelerate~52.3%of Cr(Ⅵ)*** study provides an improved understanding of the reduction mechanism of iron-modified biochar PFRs on Cr(Ⅵ)in environments.

关键词： Biochar Iron-modification Cr(Ⅵ) Electron transfer Reduction mechanism

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Towards V2I Age-Aware Fairness Access: A DQN Based Intelligent Vehicular Node Training and Test Method

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Chinese Journal of Electronics 2023年第6期32卷 1230-1244页

作者： WU Qiong SHI Shuai WAN Ziyang FAN Qiang FAN Pingyi ZHANG Cui School of Internet of Things Engineering Jiangnan University State Key Laboratory of Integrated Services Networks Xidian University Qualcomm Beijing National Research Center for Information Science and Technology Tsinghua University Banma Network Technology Co. Ltd.

Vehicles on the road exchange data with base station frequently through vehicle to infrastructure(V2I) communications to ensure the normal use of vehicular applications, where the IEEE 802.11 distributed coordination function is employed to allocate a minimum contention window(MCW) for channel access. Each vehicle may change its MCW to achieve more access opportunities at the expense of others, which results in unfair communication performance. Moreover, the key access parameter MCW is privacy information and each vehicle is not willing to share it with other vehicles. In this uncertain setting, age of information(Ao I), which measures the freshness of data and is closely related with fairness, has become an important communication *** this basis, we design an intelligent vehicular node to learn the dynamic environment and predict the optimal MCW, which can make the intelligent node achieve age fairness. In order to allocate the optimal MCW for the vehicular node, we employ a learning algorithm to make a desirable decision by learning from replay history data. In particular, the algorithm is proposed by extending the traditional deep-Q-learning(DQN) training and testing method. Finally, by comparing with other methods, it is proved that the proposed DQN method can significantly improve the age fairness of the intelligent node.

关键词： Training Privacy Heuristic algorithms Vehicle-to-infrastructure Roads Measurement uncertainty Prediction algorithms

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Low-loss and broadband complementary dual-output electro-optic modulator based on thin-film lithium niobate

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Chinese Optics Letters 2024年第9期22卷 114-119页

作者： Tingan Li Chenglin Shang Xuanhao Wang Weiqiang Lü Zhiyao Zhang Cheng Zeng Yong Liu Jinsong Xia Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 610054China

Broadband,low-drive voltage electro-optic modulators are crucial optoelectronic components in the new-generation microwave photonic links and broadband optical interconnect network *** this paper,we fabricate a low-loss thinfilm lithium niobate complementary dual-output electro-optic modulator chip with a 3 dB electro-optic bandwidth of 59 GHz and a half-wave voltage(Vπ)of 2.5 *** insert-loss of the packaged modulator is 4.2 dB after coupling with polarizationmaintaining *** complementary dual-output modulator also shows a common-mode rejection ratio of 18 dB and a signal enhancement of 6.2 dB when adapted in microwave photonic links,comparable to commercial bulk lithium niobate devices.

关键词： thin-film lithium niobate electro-optic modulator microwave photonic links.

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A Method for Detecting the Reducers' Grease Failure Based on Vibration Signal Analysis

A Method for Detecting the Reducers' Grease Failure Based on...

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2023 CAA Symposium on Fault Detection, Supervision and Safety for Technical Processes, SAFEPROCESS 2023

作者： Wang, Ditong Zhang, Hong Zheng, Ying Huazhong University of Science and Technology Belt and Road Joint Laboratory on Measurement and Control Technology Wuhan China Huazhong University of Science and Technology National Key Laboratory of Science and Technology on Multispectral Information Processing School of Artificial Intelligence and Automation Wuhan China

ISBN: (纸本)9798350337754

Real time detection of the lubricating grease's effectiveness is the best method to solve wear faults, which can achieve the purpose of predictive maintenance and improve the service life of mechanical equipment. A new online detection method for gearbox lubricating grease failure is proposed to address the issues about long offline detection cycles and high labor costs associated with phased sampling analysis. Compared with online detection methods such as inductive and photoelectric, our method is difficult to detect the specific physicochemical parameters of the grease. However, it has the advantage of simple operation without touching the grease or changing the structure of the tested object. It only needs to attach the vibration sensor table to the mechanical arm reducer to measure and analyze the vibration signal. This article briefly analyzes the impact of grease failure on vibration signals, and then we introduce a novel approach that uses support vector machines along with feature extraction through wavelet packet decomposition for our detection methodology. Next transfer the commonly used spectral image recognition algorithms for temporal signal classification to achieve failed grease detection as a baseline and compare with our traditional machine learning methods. The experimental findings indicate that the recognition accuracy of both methods are above 90%, with traditional machine learning performing better on this task. © 2023 IEEE.

关键词： Support vector machines

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Recent advances in metal-free CDs/g-C_(3)N_(4) photocatalysts:Synthetic strategies,mechanism insight,and applications

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Journal of Materials science & technology 2023年第19期150卷 11-26页

作者： Xingxing Yang Lina Sheng Yongli Ye Jiadi Sun Zaijun Li Xiao Ning Jin Cao Xiulan Sun State Key Laboratory of Food Science and Technology School of Food Science and TechnologyCollaborative Innovation Center of Food Safety and Quality ControlJiangnan UniversityWuxi 214122China Yixing Institute of Food and Biotechnology Co. LtdYixing 214200China School of Chemical and Material Engineering Jiangnan UniversityWuxi 214122China National Institutes for Food and Drug Control Beijing 100050China

Carbon dots/graphite carbon nitride(CDs/g-C_(3)N_(4)),a novel composite photocatalyst,has shown great po-tential for applications in energy regeneration and environmental remediation owing to its following advantages:metal-free,low cost,easily tunable,and excellent photocatalytic ***,we reviewed the development of synthetic strategies,photocatalytic enhancement mechanisms,and pho-tocatalytic applications of CDs/g-C_(3)N_(4) in this ***,the three composite strategies of CDs and g-C_(3)N_(4)-self-assembly,solvothermal,and calcination polymerization are outlined,and their advantages and disadvantages are described in ***,the photocatalytic enhancement mechanism of the com-posite strategies was elucidated according to the variation trends of CDs/g-C_(3)N_(4) band structure,electronic properties,light absorption range,and interfacial charge ***,the applications of CDs/g-C_(3)N_(4) in hydrogen evolution,pollutant degradation,CO_(2) reduction,and bacterial disinfection in recent years are reviewed ***,the current obstacles and future research directions of CDs/g-C_(3)N_(4) are discussed from the perspective of preparation technology and practical applications,respectively.

关键词： Photocatalysis Graphite carbon nitride Carbon dots Synthetic strategy Photocatalytic application

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Rubik’s cube as in-situ programmable matter and a reconfigurable mechanical metamaterial

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science China(Technological sciences) 2024年第10期67卷 3221-3234页

作者： ZHU ShaoWei CHEN Huan YANG XiaoQiang TAN Li JIN Shuai CHEN LiMing LIU Tao TAN XiaoJun WANG LianChao WANG Bing MUAMER Kadic State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400030China College of Aerospace Engineering Chongqing UniversityChongqing 400030China School of Civil Aviation Northwestern Polytechnical UniversityXi’an 710129China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China Institut FEMTO-ST CNRS UMR 6174University BourgogneFranche-ComtBesan¸con 25000France

As part of the 4th industrial revolution,programmable mechanical metamaterials exhibit great application potential in flexible robotics,vibration control,and impact ***,maintaining a programmed state without sustaining the external stimulus is often challenging and leads to additional energy *** by Rubik’s cube,we design and study an in-situ programmable and distribution-reconfigurable mechanical metamaterial(IPDR-MM).A matrix model is developed to model IPDR-MMs and describe their morphological *** on this model,the reinforcement learning method is employed to find the pathways for morphological *** find that IPDR-MMs have controllable stiffness across several orders of magnitude and a wide range of adjustable anisotropies through morphology ***,because of the independence of the directions of morphology transformation and bearing,IPDR-MMs exhibit good stability in bearing and can readily achieve high *** Rubik’s cube-inspired design concept is also instructive for other deformable structures and metamaterials,and the current version of the proposal should be sufficiently illustrative to attract and broaden interdisciplinary interests.

关键词： mechanical metamaterials in-situ programmable distribution-reconfigurable Rubik’s cube controllable stiffness and anisotropy

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Nearly degenerate ground states of a checkerboard antiferromagnet and their bosonic interpretation

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science China(Physics,Mechanics & Astronomy) 2024年第1期67卷 84-89页

作者： Haiyuan Zou Fan Yang Wei Ku Key Laboratory of Polar Materials and Devices(MOE) School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China Department of Physics Beijing Institute of TechnologyBeijing 100081China Tsung-Dao Lee Institute Shanghai 200240China Key Laboratory of Artificial Structures and Quantum Control(Ministry of Education) Shanghai 200240China Shanghai Branch Hefei National LaboratoryShanghai 201315China

The spin-1/2 model system with antiferromagnetic(AF) couplings on a J1-J2checkerboard lattice, known as the planar pyrochlore model, is strongly frustrated and associated with a two-to-one dimensional crossover. Using the Projected Entangled Simplex States tensor network ansatz, we identify a large number of nearly degenerate states in the frustrated region(J_(1)

关键词： tensor networks frustrated magnetism dimensional crossover degenerate states

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