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Fe-Ni-F electrocatalyst for enhancing reaction kinetics of water oxidation

Chinese Journal of Structural Chemistry 2024年第2期43卷 60-65页

作者： Yi Zhang Biao Wang Chao Hu Muhammad Humayun Yaping Huang Yulin Cao Mosaad Negem Yigang Ding Chundong Wang School of Chemical Engineering and Pharmacy Key Laboratory of Green Chemical Process of Ministry of EducationKey Laboratory of Novel Reactor and Green Chemical Technology of Hubei ProvinceWuhan Institute of TechnologyWuhan430073PR China Energy Waterand Environment LabCollege of Humanities and SciencesPrince Sultan UniversityRiyadh11586Saudi Arabia School of Integrated Circuits Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan430074PR China Physics Laboratory Industrial Training CenterShenzhen Polytechnic UniversityShenzhen518055PR China Chemistry Department Faculty of ScienceFayoum UniversityFayoum63514Egypt

Highly active and low-cost oxygen evolution reaction(OER)catalytic electrodes are extremely essential for exploration of green hydrogen via water ***,an advanced Fe-Ni-F electrocatalyst is fabricated by a facile annealing strategy using ammonium fluoride,of which the structure feature is unveiled by XRD,FESEM,TEM,EDS,BET,and XPS *** as-prepared Fe-Ni-F addresses a low overpotential of 277 mV and a small Tafel slope of 49 mV dec^(-1)at a current density of 10 mA cm^(-2),significantly outperforming other control samples as well as the state-of-the-art RuO_(2).The advanced nature of our Fe-Ni-F catalyst could also be further evidenced from the robust stability in KOH alkaline solution,showing as 5.41%degradation after 24 h continuous *** analysis,it suggests that the decent catalytic activity should be attributed to the formed bimetallic(oxy)hydroxides because of the introduction of fluoride and the synergistic effect of iron and nickel towards oxygen *** work represents the potential of Fe-and/or Ni-based fluoride as efficient catalyst for low-energy consumption oxygen generation.

关键词： Fluoride Oxygen evolution reaction Fe-Ni-F Reaction kinetics

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Microcavity assisted graphene pressure sensor for single-vessel local blood pressure monitoring

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Nano Research 2024年第11期17卷 10058-10068页

作者： Jinan Luo Jingzhi Wu Xiaopeng Zheng Haoran Xiong Lin Lin Chang Liu Haidong Liu Hao Tang Houfang Liu Fei Han Zhiyuan Liu Zhikang Deng Chuting Liu Tianrui Cui Bo Li Tian-Ling Ren Jianhua Zhou Yancong Qiao School of Biomedical Engineering Shenzhen Campus of Sun Yat-sen University Shenzhen 518107 China Key Laboratory of Sensing Technology and Biomedical Instruments of Guangdong Province School of Biomedical Engineering Sun Yat-sen University Guangzhou 510275 China School of Integrated Circuits and Beijing National Research Center for Information Science and Technology (BNRist) Tsinghua University Beijing 100084 China CAS Key Laboratory of Human-Machine Intelligence-Synergy Systems Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences (CAS) Shenzhen 518055 China Cardiovascular surgery Seventh affiliated Hospital of Sun Yat-sen University Shenzhen 518107 China

Dynamic monitoring of blood pressure (BP) is beneficial to obtain comprehensive cardiovascular information of patients throughout the day. However, the clinical BP measurement method relies on wearing a bulky cuff, which limits the long-term monitoring and control of BP. In this work, a microcavity assisted graphene pressure sensor (MAGPS) for single-vessel local BP monitoring is designed to replace the cuff. The microcavity structure increases the working range of the sensor by gas pressure buffering. Therefore, the MAGPS achieves a wide linear response of 0–1050 kPa and sensitivity of 15.4 kPa^(−1). The large working range and the microcavity structure enable the sensor to fully meet the requirements of BP detection at the radial artery. A database of 228 BP data (60-s data fragment detected by MAGPS) and 11,804 pulse waves from 9 healthy subjects and 5 hypertensive subjects is built. Finally, the BP was detected and analyzed automatically by combining MAGPS and a two-stage convolutional neural network algorithm. For the BP detection method at local radial artery, the first stage algorithm first determines whether the subject has hypertension by the pulse wave. Then, the second stage algorithm can diagnose systolic and diastolic BP with the accuracy of 93.5% and 97.8% within a 10 mmHg error, respectively. This work demonstrates a new BP detection method based on single vessel, which greatly promotes the efficiency of BP detection.

关键词： graphene pressure sensor microcavity assisted pressure sensor single-vessel BP monitoring two-stage neural network algorithm

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In-situ synthesis,microstructure,and properties of NbB_(2)-NbC-Al_(2)O_(3)composite coatings by plasma spraying

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Journal of Advanced Ceramics 2022年第8期11卷 1263-1278页

作者： Xiaolong WANG Yong YANG Shitong JIA Yanwei WANG Yuduo MA Yuhang CUI Xingyu WANG Wenwei SUN Liang WANG Key Lab.for New Type of Functional Materials in Hebei Province School of Materials Science and EngineeringState Key Laboratory of Reliability and Intelligence of Electrical EquipmentTianjin Key Laboratory of Materials Laminating Fabrication and Interface Control TechnologyHebei University of TechnologyTianjin 300401China Integrated Computational Materials Research Centre Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201899China

The high melting point and strong chemical bonding of NbB_(2)pose a great challenge to the preparation of high-density nanostructured NbB_(2)composite ***,we report a novel,simple,and efficient method to fabricate in-situ NbB_(2)–NbC–Al_(2)O_(3)composite coating by plasma spraying Nb_(2)O_(5)–B_(4)C–Al composite powder,aiming at realizing the higher densification and ultra-fine microstructure of NbB_(2)composite *** microstructure and properties of in-situ NbB_(2)–NbC–Al_(2)O_(3)composite coating were studied comparatively with ex-situ NbB_(2)–NbC–Al_(2)O_(3)composite coating(plasma spraying NbB_(2)–NbC–Al_(2)O_(3)composite powder).The reaction mechanism of Nb_(2)O_(5)–B_(4)C–Al composite powder in plasma jet was analyzed in *** results showed that the in-situ nanostructured NbB_(2)–NbC–Al_(2)O_(3)composite coating presented a lower porosity and superior performance including higher microhardness,toughness and wear resistance compared to the plasma sprayed ex-situ NbB_(2)–NbC–Al_(2)O_(3)coating and other boride composite *** of the in-situ NbB_(2)–NbC–Al_(2)O_(3)coating was attributed to the low melting point of Nb_(2)O_(5)–B_(4)C–Al composite powder and the exothermic effect of in-situ *** superior performance was ascribed to the density improvement and the strengthening and toughening effect of the nanosized *** in-situ reaction path could be expressed as:Nb_(2)O_(5)+Al®Nb+Al_(2)O_(3),and Nb+B_(4)C®NbB_(2)+NbC.

关键词： NbB_(2)-NbC-Al_(2)O_(3)composite coating plasma spray in-situ synthesis Nb_(2)O_(5)-B_(4)C-Al system

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A RESEARCH OF THE DISCRETE DIGITAL BRAKE VALVE MATCHING DESIGN AND control FOR LARGE AIRCRAFT

A RESEARCH OF THE DISCRETE DIGITAL BRAKE VALVE MATCHING DESI...

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2024 CSAA/IET International Conference on Aircraft Utility Systems, AUS 2024

作者： Wang, Yi Wu, Shuai Jin, Hongtao Li, Chuandong Gao, Xiaolong Jiao, Zongxia School of Automation Science and Electrical Engineering Beihang University Beijing100191 China National Key Laboratory of Aircraft Integrated Flight Control Beihang University Beijing100191 China Ministry of Industry and Information Technology Beijing100191 China Ningbo Institute of Technology Beihang University Ningbo315800 China Tianmushan Laboratory Hangzhou310023 China

The aircraft braking system is a vital component of the aircraft, responsible for dissipating the kinetic energy of the aircraft and slowing it down to stop. In the field of aircraft braking systems, hydraulic systems with high power-to-weight ratios are currently the preferred choice. The brake control valve is a crucial component of the braking system, regulating the pressure of the essential components. The use of a discrete digital valve, designed to be pollution-resistant and fault-tolerant, can significantly enhance the performance of the braking system. The majority of existing designs and selections for discrete digital valves are based on experience, which may result in the unnecessary increase in system redundancy, volume and weight. This paper analyses the requirements of an aircraft braking system, combining the load situation and actual working conditions to determine the matching design of discrete digital valves. The efficacy of the designed brake valve in terms of performance and braking effectiveness is validated through the construction of a discrete digital valve braking system model. © The Institution of Engineering & technology 2024.

关键词： Aircraft hydraulic systems

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Enhancing energy storage efficiency in lead-free dielectric ceramics through relaxor and lattice strain engineering

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Journal of Materiomics 2024年第6期10卷 1196-1205页

作者： Xuetian Gong Chao Zhang Dong Su Wenrong Xiao Fangjie Cen Ying Yang Shenglin Jiang Jing Wang Kanghua Li Guangzu Zhang School of Integrated Circuits Engineering Research Center for Functional Ceramics MOE and Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhanHubei430074China College of Chemnistry and Materials Science Hebei UniversityBaodingHebei071002China Key Lab of Functional Materials for Electronic Information(B) Ministry of EducationWuhanHubei430074China

Dielectric capacitors with high power density and fast charge-discharge speed play an essential role in the development of pulsed power *** increased demands for miniaturization and practicality of pulsed power equipment also necessitate the development of dielectric materials that possess high energy density while maintaining ultrahigh efficiency(η).In particular,ultrahigh efficiency signifies minimal energy loss,which is essential for practical applications but challenging to effectively ***,we demonstrate a strategy of incorporating heterovalent elements into Ba(Zr_(0.1)Ti_(0.9))O_(3),which contributes to achieving relaxor ferroelectric ceramics and reducing lattice strain,thereby improving the comprehensive energy storage ***,optimal energy storage performance is attained in 0.85Ba(Zr_(0.1)Ti_(0.9))O_(3)-0.15Bi(Zn_(2/3)Ta_(1/3))O_(3)(BZT-0.15BiZnTa),with an ultrahighηof 97.37%at 440 kV/cm(an advanced level in the lead-free ceramics)and an excellent recoverable energy storage density(Wrec)of 3.74 J/cm^(3).Notably,the BZT-0.15BiZnTa ceramics also exhibit exceptional temperature stability,maintaining fluctuations in Wrec within∼10%andηconsistently exceeding 90% across the wide temperature range of−55℃ to 160℃,and under a high electric field of 250 kV/*** these features demonstrate that the relaxor and lattice strain engineering strategies have been successful in achieving high-performance lead-free ceramics,paving the way for designing high-efficiency dielectric capacitors with a wide temperature range.

关键词： Energy storage Relaxor ferroelectrics Lead-free ceramics Lattice strain engineering

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Femtosecond laser 3D nanoprinting using inorganic nano-building blocks

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The Innovation 2025年第3期6卷 3-4页

作者： Yi-Ke Sun Yu-Qing Liu Qi-Dai Chen Yong-Lai Zhang State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China Center for Advanced Optoelectronic Functional Materials Research Key Laboratory for UV Emitting Materials and Technology of Ministry of EducationNational Demonstration Center for Experimental Physics EducationNortheast Normal UniversityChangchun 130024China

Since the 1990s,femtosecond laser two-photon absorption(TPA),which enables point-by-point photopolymerization,has been a tool for making threedimensional(3D)*** 10 years later,Kawata et *** the spatial resolution of TPA fabrication to120 nm,far beyond the diffraction limit of the 780 nm laser source.1 The essential mechanism of this nanoscale fabrication lies in the nonlinear effect,in which TPA-induced photopolymerization occurs only in the vicinity of the focal spot.

关键词： nonlinear effectin two photon absorption nonlinear effect femtosecond laser photopolymerization inorganic nano building blocks nanoscale fabrication

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Research Progress and Prospect of High-Speed Vehicle control technology Based on Reinforcement Learning

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Advances in Astronautics 2025年 1-9页

作者： Lu, Kunfeng Wang, Weili Liu, Xiaodong Huang, Wanwei Jia, Chenhui Yu, Yue Beijing Aerospace Automatic Control Institute Beijing China National Key Laboratory of Science and Technology on Aerospace Intelligent Control Beijing China

High reliability and intelligence mark the cutting-edge development trend of high-speed vehicle control technology. This research focuses on the progress of high-speed vehicle control technology based on reinforcement learning, and sorts out its application in control parameter tuning, compensation control, and end-to-end control. Focusing on the development framework of intelligent control safety and efficiency, this paper deeply analyzes the challenges of safety, training efficiency, and interpretability faced by high-speed vehicle in reinforcement learning control, and proposes feasible paths and development directions for future research.

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science China(Life sciences) 2024年第9期67卷 1970-1988页

作者： Jiayi Yu Changbing Zheng Qiuping Guo Yulong Yin Yehui Duan Fengna Li CAS Key Laboratory of Agro-ecological Processes in Subtropical Region Hunan Provincial Key Laboratory of Animal Nutritional Physiology and Metabolic ProcessNational Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry ProductionInstitute of Subtropical AgricultureChinese Academy of SciencesChangsha 410125China University of Chinese Academy of Sciences Beijing 100049China College of Animal Science and Technology Hunan Agricultural UniversityChangsha 410128China

We previously demonstrated that lipopolysaccharide(LPS)injection-induced immune stress could impair muscle growth in weaned piglets,but the precise mechanisms behind this remain ***,we found that chronic immune stress induced by LPS resulted in a significant reduction of 36.86%in the total muscle mass of piglets at 5 d post-treatment compared with the control *** 1 d,prior to muscle mass loss,multiple alterations were noted in response to LPS *** included a reduction in the abundance of Bacteroidetes,an increase in serum concentrations of pro-inflammatory cytokines,compromised mitochondrial morphology,and an upregulation in the expression of dynamin-related protein 1(Drp1),a critical protein involved in mitochondrial *** highlight a strong negative correlation between Bacteroidetes abundance and the levels of serum pro-inflammatory cytokines,corroborated by in vivo intervention strategies in the musculature of both pig and mouse ***,the effects of Bacteroidetes on inflammation and muscle mass loss may involve the signaling pathway of the tauro-β-muricholic acid-fibroblast growth factor ***,the induction of overexpression of inflammatory cytokines,achieved without LPS treatment through oral administration of recombinant human IL-6(rh IL-6),led to increased levels of circulating cytokines,subsequently causing a decrease in muscle ***,pre-treatment with Mdivi-1,an inhibitor of Drp-1,markedly attenuated the LPS-induced elevation in reactive oxygen species levels and rescued the associated decline in muscle ***,these data indicate that LPS-induced muscle mass loss was linked to the reduction of Bacteroidetes abundance,increased inflammation,and the disruption of mitochondrial *** insights offer promising avenues for the identification of potential therapeutic targets aimed at mitigating muscle mass loss.

关键词： Bacteroidetes inflammation mitochondrial morphology muscle mass loss piglets

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Exploring Image Generation for UAV Change Detection

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IEEE/CAA Journal of Automatica Sinica 2022年第6期9卷 1061-1072页

作者： Xuan Li Haibin Duan Yonglin Tian Fei-Yue Wang Peng Cheng Laboratory Shenzhen 518000China IEEE State Key Laboratory of Virtual Reality Technology and Systems School of Automation Science and Electrical EngineeringBeihang UniversityBeijing 100083 Department of Automation University of Science and Technology of ChinaHefei 230027 State Key Laboratory for Management and Control of Complex Systems Institute of AutomationChinese Academy of SciencesBeijing 100190China Research Center for Computational Experiments and Parallel Systems Technology National University of Defense TechnologyChangsha 410073China

Change detection(CD)is becoming indispensable for unmanned aerial vehicles(UAVs),especially in the domain of water landing,rescue and ***,even the most advanced models require large amounts of data for model training and ***,sufficient labeled images with different imaging conditions are *** by computer graphics,we present a cloning method to simulate inland-water scene and collect an auto-labeled simulated *** simulated dataset consists of six challenges to test the effects of dynamic background,weather,and noise on change detection ***,we propose an image translation framework that translates simulated images to synthetic *** framework uses shared parameters(encoder and generator)and 22×22 receptive fields(discriminator)to generate realistic synthetic images as model training *** experimental results indicate that:1)different imaging challenges affect the performance of change detection models;2)compared with simulated images,synthetic images can effectively improve the accuracy of supervised models.

关键词： Change detection computer graphics image translation simulated images synthetic images unmanned aerial vehicles(UAVs)

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Vibration Characteristics of Rotor System with Loose Disc Caused by the Insufficient Interference Force

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Chinese Journal of Mechanical Engineering 2022年第3期35卷 297-311页

作者： Zhinong Li Fang Qiao Wenxiu Lu Jie Liu Dong Wang Fulei Chu Key Laboratory of Nondestructive Testing Ministry of EducationNanchang Hangkong UniversityNanchang 330063China Laboratory of Science and Technology on Integrated Logistics Support National University of Defense TechnologyChangsha 410073China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China State Key Laboratory of Mechanical Systems and Vibration Shanghai Jiao Tong UniversityShanghai 200240China

The rotating parts looseness is one of the common failures in rotating *** current researches of looseness fault mainly focus on non-rotating ***,the looseness fault of disc-shaft system,which is the main work part in the rotor system,is almost ***,a dynamic model of the rotor system with loose disc caused by the insufficient interference force is proposed based on the contact model of disc-shaft system with the microscopic surface topography,the vibration characteristics of the system are analyzed and discussed by the number simulation,and verified by the *** results show that the speed of the shaft,the contact stiffness,the clearance between the disc and shaft,the damping of the disc and the rotational damping have an influence on the rotation state of the *** the rotation speed of the disc and the shaft are same,the collision frequency is mainly composed of one frequency multiplication component and very weak high frequency multiplication *** the rotation speed of the disc and the shaft is close,the vibration of the disc occurs a beat vibration phenomenon in the horizontal ***,a periodical similar beat vibration phenomenon also occurs in the waveform of the disc-shaft displacement *** collision frequency is mainly composed of a low frequency and a weak high frequency *** the rotation speed of the disc and the shaft has great difference,the collision frequency is mainly composed of one frequency multiplication,a few weak high frequency multiplication components and a few low frequency multiplication *** the reduction of the relative speed of the disc,the trajectory of the disc changes from circle-shape to inner eight-shape,and then to *** the inner eight-shape,the inner ring first gradually becomes smaller and then gradually becomes larger,and the outer ring is still getting *** obtained research results in this paper has importa

关键词： Rotor system with loose disc Rotor dynamics Nonlinear dynamic characteristic Nonlinear vibration Insufficient interference force Fault diagnosis

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