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Chinese journal of aeronautics 2024年第5期37卷 39-59页

作者： Zikang sU Zhuolin XING Xuebing li Chuntao li Xinwei wang Honglun wang College of Automation engineering Nanjing University of Aeronautics and AstronauticsNanjing 211106China school of engineering and Materials science Queen Mary University of LondonLondon E14NSUK school of Automation science and Electrical engineering Beihang UniversityBeijing 100191China

In this work,we sought to investigate constrained docking control during shipborne sideArm recovery of an Unmanned Aerial Vehicle(UAV)under preassigned safe docking constraints,rough ocean environments,and different initial *** aim was to solve the UAV tracking-lag problem that manifests when attempting to dock with a rapidly moving sideArm and to improve the accuracy and rapidity of ***,together with the formulations of the shipborne sideArm system and environmental airflows,the affine nonlinear dynamics of the hook was established to reduce tracking ***,echo state network approximators with good approximation capacity and low computational consumption were designed to accurately approximate the UAV’s unknown nonlinear *** feedforward compensation provided by these approximators,a nonlinear-mapping-based constrained docking control law was developed for shipborne sideArm recovery of *** approach to controlling the docking trajectory and the forward docking speed of the UAV can achieve rapid and exact docking with a moving sideArm,without violating the preassigned safe docking-constraint *** under different docking scenarios were used to validate the effectiveness and advantages of the proposed docking-control algorithm.

关键词： sideArm recovery Unmanned aerial vehicle Docking control Nonlinear mapping Echo state network

Rescattering of stimulated Raman side scattering in nonuniform plasmas

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Matter and Radiation at Extremes 2024年第5期9卷 68-76页

作者： s.tan Q.wang Y.Chen W.B.Yao C.Z.Xiao j.f.Myatt school of Physics and Electronics Hunan UniversityChangsha 410082China Institute of Applied Physics and Computational Mathematics Beijing 100094China school of Electrical and Information engineering Anhui University of Science and TechnologyHuainanAnhui 232001China Department of Electrical and Computer engineering University of Alberta9211116 St.NWEdmontonAlberta T6G 1H9Canada

Rescattering of stimulated Raman side scattering(sRss)is observed for the first time via two-dimensional(2D)particle-in-cell(PIC)*** construct a theoretical model for the rescattering process,which can predict the region of occurrence of mth-order sRss and estimate its *** rescattering process is identified by the 2D PIC simulations under typical conditions of a direct-drive inertial confinement fusion *** electrons produced by second-order sRss propagate nearly perpendicular to the density gradient and gain nearly the same energy as in first-order sRss,but there is no cascade acceleration to produce superhot *** studies for a wide range of ignition conditions show that sRss and associated rescatterings are robust and important processes in inertial confinement fusion.

关键词： nonuniform acceleration scattering

Untethered Micro/Nanorobots for Remote sensing:toward Intelligent Platform

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Nano-Micro Letters 2024年第2期16卷 450-483页

作者： Qianqian wang shihao Yang li Zhang jiangsu Key Laboratory for Design and Manufacture of Micro‑Nano Biomedical Instruments School of Mechanical EngineeringSoutheast UniversityNanjing 211189People’s Republic of China Department of Mechanical and Automation engineering The Chinese University of Hong KongShatinHong Kong 999077People’s Republic of China Chow Yuk Ho technology Centre for Innovative Medicine The Chinese University of Hong KongShatinHong Kong 999077People’s Republic of China t stone Robotics Institute The Chinese University of Hong KongShatinHong Kong 999077People’s Republic of China Department of surgery The Chinese University of Hong KongShatinHong Kong 999077People’s Republic of China

Untethered micro/nanorobots that can wirelessly control their motion and deformation state have gained enormous interest in remote sensing applications due to their unique motion characteristics in various media and diverse *** are developing micro/nanorobots as innovative tools to improve sensing performance and miniaturize sensing systems,enabling in situ detection of substances that traditional sensing methods struggle to *** the past decade of development,significant research progress has been made in designing sensing strategies based on micro/nanorobots,employing various coordinated control and sensing *** review summarizes the latest developments on micro/nanorobots for remote sensing applications by utilizing the self-generated signals of the robots,robot behavior,microrobotic manipulation,and robot-environment *** recent studies and relevant applications in remote sensing,we also discuss the challenges and future perspectives facing micro/nanorobots-based intelligent sensing platforms to achieve sensing in complex environments,translating lab research achievements into widespread real applications.

关键词： Micro/nanorobot Remote sensing Wireless control self-propulsion Actuation at small scales

Insight into the synergistic effect of defect and strong interface coupling on ZnIn_(2)s_(4)/CoIn_(2)s_(4)heterostructure for boosting photocatalytic H_(2) evolution

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journal of Energy Chemistry 2024年第5期92卷 151-161页

作者： Xuehua wang tianyu shi Xianghu wang Aili song Guicun li Lei wang jianfeng Huang Alan Meng Zhenjiang li College of Materials science and engineering Qingdao University of Science and TechnologyQingdao 266042ShandongChina Key Laboratory of Optic-electric sensing and Analytical Chemistry for life science MOECollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042ShandongChina Qingdao Huanghai University Qingdao 266000ShandongChina school of Material science and engineering International S&T Cooperation Foundation of Shaanxi ProvinceXi’an Key Laboratory of Green Manufacture of Ceramic MaterialsShaanxi University of Science and TechnologyXi’an 710021ShaanxiChina

steering the directional carrier migration across the interface is a central mission for efficient photocatalytic *** this work,an atomic-shared heterointerface is constructed between the defect-rich ZnIn_(2)s_(4)(HVs-ZIs)and CoIn_(2)s_(4)(CIs)via a defect-guided heteroepitaxial growth *** strong interface coupling induces adequate carriers exchanging passageway between HVs-ZIs and CIs,enhancing the internal electric field(IEf)in the ZnIn_(2)s_(4)/CoIn_(2)s_(4)(HVs-ZIs/CIs)*** defect structure in HVs-ZIs induces an additional defect level,improving the separation efficiency of ***,promoted by the IEf and intimate heterointerface,photogenerated electrons trapped by the defect level can migrate to the valence band of CIs,contributing to massive photogenerated electrons with intense reducibility in HVs-ZIs/***,the HVs-ZIs/CIs heterostructure performs a boosted H_(2)evolution activity of 33.65 mmol g^(-1)h^(-1).this work highlights the synergistic effects of defect and strong interface coupling in regulating carrier transfer and paves a brave avenue for constructing efficient heterostructure photocatalysts.

关键词： Defect-guided heteroepitaxial growth Heterointerface coupling Photocatalytic H_(2)evolution Mechanism HVs-ZIs/CIs

stable multi-electron reaction stimulated by W doping Vs_(4)for enhancing magnesium storage performance

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journal of Energy Chemistry 2024年第2期89卷 89-98,I0004页

作者： Yuxin tian jiankang Chen Guofeng wang Bing sun Alan Meng Lei wang Guicun li jianfeng Huang shiqi Ding Zhenjiang li College of Materials science and engineering Qingdao University of Science and TechnologyQingdao 266042ShandongChina Key Laboratory of Optic-electric sensing and Analytical Chemistry for life science MOEShandong Key Laboratory of Biochemical AnalysisCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042ShandongChina school of Material science and engineering International S&T Cooperation Foundation of Shaanxi ProvinceXi’an Key Laboratory of Green Manufacture of Ceramic MaterialsShaanxi University of Science and TechnologyXi’an 710021ShaanxiChina

Rechargeable magnesium batteries(RMBs)hold promise for offering higher volumetric energy density and safety features,attracting increasing research interest as the next post lithium-ion *** high performance cathode material by inducing multi-electron reaction process as well as maintaining structural stability is the key to the development and application of ***,multielectron reaction occurred in Vs_(4)by simple W doping strategy.W doping induces valence of partial V as V^(2+)and V^(3+)in Vs_(4)structure,and then stimulates electrochemical reaction involving multi-electrons in 0.5%*** flower-like microsphere morphology as well as rich s vacancies is also modulated by W doping to neutralize structure change in such multi-electron reaction *** fabricated 0.5%W-V-s delivers higher specific capacity(149.3 m A h g^(-1)at 50 m A g^(-1),which is 1.6 times higher than that of Vs_(4)),superior rate capability(76 mA h g^(-1)at 1000 mA g^(-1)),and stable cycling performance(1500cycles with capacity retention ratio of 93.8%).Besides that,pesudocapaticance-like contribution analysis as well as galvanostatic intermittent titration technique(GItt)further confirms the enhanced Mg^(2+)storage kinetics during such multi-electron involved electrochemical reaction *** discovery provides new insights into the designing of multi-electron reaction process in cathode as well as neutralizing structural change during such reaction for realizing superior electrochemical performance in energy storage devices.

关键词： Multi-electron reaction W doping stable structure Cathode Rechargeable magnesium batteries

A Novel Method for Aging Prediction of Railway Catenary Based on Improved Kalman filter

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structural Durability & Health Monitoring 2024年第1期18卷 73-90页

作者： jie li Rongwen wang Yongtao Hu jinjun li school of Electrical engineering and Automation Henan Institute of TechnologyXinxiang453003China technology Center Sichuan Injet Electric Co.Ltd.Deyang618000China Embedded system Research Institute Xinxiang Engineering Research Center for Intelligent Condition Monitoring of MachineryXinxiang453003China

the aging prediction of railway catenary is of profound significance for ensuring the regular operation of electrified ***,in real-world scenarios,accurate predictions are challenging due to various *** paper addresses this challenge by proposing a novel method for predicting the aging of railway catenary based on an improved Kalman filter(Kf).the proposed method focuses on modifying the priori state estimate covariance and measurement error covariance of the Kf to enhance accuracy in complex *** comparing the optimal displacement value with the theoretically calculated value based on the thermal expansion effect of metals,it becomes possible to ascertain the aging status of the *** improve prediction accuracy,a railway catenary aging prediction model is constructed by integrating the takagi-sugeno(t-s)fuzzy neural network(fNN)and *** this model,an adaptive training method is introduced,allowing the fNN to use fewer fuzzy *** inputs of the model include time,temperature,and historical displacement,while the output is the predicted ***,the Kf is enhanced by modifying its prior state estimate covariance and measurement error *** modifications contribute to more accurate ***,a low-power experimental platform based on fPGA is implemented to verify the effectiveness of the proposed *** test results demonstrate that the proposed method outperforms the compared method,showcasing its superior performance.

关键词： Railway catenary takagi-sugeno fuzzy neural network Kalman filter aging prediction

MOf-templated tubular Ni_(1−x)Co_(x)s_(2)-Cds heterojunction with intensified direct Z-scheme charge transmission for highly promoted visible-light photocatalysis

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Nano Research 2024年第7期17卷 6281-6293页

作者： Chuan jiang Yuanxin Qiu Xinxin Xin Yanyan li Huilin li Hui wang jixiang Xu Haifeng lin Lei wang Volodymyr turkevych Key Laboratory of Eco-chemical engineering International S&T Cooperation Foundation of Eco-chemical Engineering and Green ManufactureCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China shandong Provincial Key Laboratory of Olefin Catalysis and Polymerization Key Laboratory of Rubber-Plastics of Ministry of EducationSchool of Polymer Science and EngineeringQingdao University of Science and TechnologyQingdao 266042China V.Bakul Institute for superhard Materials National Academy of Sciences of UkraineKyiv 04074Ukraine

Hollow semiconductor nanostructures with direct Z-scheme heterojunction have significant advantages for photocatalytic reactions,and optimizing the interfacial charge transmission of Z-scheme heterojunction is the hinge to achieve excellent solar conversion *** this work,tubular Ni_(1−x)Co_(x)s_(2)-Cds heterostructures with reinforced Z-scheme charge transmission were constructed through an In-metal-organic framework(MOf)templated *** Z-scheme charge transfer mechanism was sufficiently confirmed by combining density functional theory(Dft)calculation,X-ray photoelectron spectroscopy(XPs),surface photovoltage spectroscopy(sPV),and radical testing ***,the use of sodium citrate complexant contributes to the formation of intimate heterointerface,and the fermi level gap between Cds and Nis_(2)is enlarged through Co doping into Nis_(2),which enhances the built-in electric field and photo-carriers transmission driving force for Ni_(1−x)Co_(x)s_(2)-Cds heterojunction,resulting in an evidently promoted activity toward H2 evolution reaction(HER).Under visible-light(λ>400 nm)irradiation,the Ni_(1−x)Co_(x)s_(2)-Cds composite with 10 mol%Co doping and 80 wt.%Cds(NC_(0.10)s-80%Cds)achieved an outstanding HER rate up to 35.94 mmol·g^(−1)·h^(−1)(corresponding to the apparent quantum efficiency of 34.7%at 420 nm),approximately 76.4 times that of 3 wt.%Pt-loaded Cds and it is much superior to that of most Cds-based photocatalysts ever ***,the good photocatalytic durability of Ni_(1−x)Co_(x)s_(2)-Cds heterostructures was validated by cycling and long-term HER *** work could inspire the development of high-performance Z-scheme heterojunction via optimizing the morphology and interfacial charge transmission.

关键词： tubular heterostructure Z-scheme charge transmission interfacial coupling built-in electric field visible-light photocatalysis

strain Gradient finite Element formulation of flexoelectricity in ferroelectric Material Based on Phase-field Method

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Acta Mechanica solida sinica 2024年第4期37卷 570-579页

作者： shuai wang Hengchang su Min Yi li-Hua shao National Key Laboratory of strength and structural Integrity Institute of Solid MechanicsSchool of Aeronautic Science and EngineeringBeihang UniversityBeijing100191People’s Republic of China state Key Laboratory of Mechanics and Control for Aerospace structures and Institute for frontier science and Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education and College of Aerospace engineering Nanjing University of Aeronautics and AstronauticsNanjing210016People’s Republic of China

flexoelectricity is a two-way coupling effect between the strain gradient and electric field that exists in all dielectrics,regardless of point group ***,the high-order derivatives of displacements involved in the strain gradient pose challenges in solving electromechanical coupling problems incorporating the flexoelectric *** this study,we formulate a phase-field model for ferroelectric materials considering the flexoelectric effect.A four-node quadrilateral element with 20 degrees of freedom is constructed without introducing high-order shape *** microstructure evolution of domains is described by an independent order parameter,namely the spontaneous polarization governed by the time-dependent Ginzburg–Landau *** model is developed based on a thermodynamic framework,in which a set of microforces is introduced to construct the constitutive relation and evolution *** the flexoelectric part of electric enthalpy,the strain gradient is determined by interpolating the mechanical strain at the node via the values of Gaussian integration points in the isoparametric *** model is shown to be capable of reproducing the classic analytical solution of dielectric materials incorporating the flexoelectric *** model is verified by duplicating some typical phenomena in flexoelectricity in cylindrical tubes and truncated pyramids.A comparison is made between the polarization distribution in dielectrics and *** model can reproduce the solution to the boundary value problem of the cylindrical flexoelectric tube,and demonstrate domain twisting at domain walls in ferroelectrics considering the flexoelectric effect.

关键词： flexoelectricity Phase-field method ferroelectrics Domain configuration

An exploration for the macroscopic physical meaning of entropy

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science China(technological sciences) 2010年第7期53卷 1809-1816页

作者： WU jing1 & GUO ZengYuan2 1 College of Energy and Power engineering, Nanjing University of aeronautics and Astronautics, Nanjing 210016, China 2 Key Laboratory for thermal science and Power engineering of Ministry of Education, school of Aerospace, tsinghua University, Beijing 100084, China College of Energy and Power engineering Nanjing University of Aeronautics and Astronautics Nanjing China Key Laboratory for thermal science and Power engineering of Ministry of Education School of Aerospace Tsinghua University Beijing China

the macroscopic physical meaning of entropy is analyzed based on the exergy (availability) of a combined system (a closed system and its environment), which is the maximum amount of useful work obtainable from the system and the environment as the system is brought into equilibrium with the environment. the process the system experiences can be divided in two sequent sub-processes, the process at constant volume, which represents the heat interaction of the system with the environment, and the adiabatic process, which represents the work interaction of the system with the environment. It is shown that the macroscopic physical meaning of entropy is a measure of the unavailable energy of a closed system for doing useful work through heat interaction. this statement is more precise than those reported in prior literature. the unavailability function of a closed system can be defined as t0s and p0V in volume constant process and adiabatic process, respectively. their changes, that is, Aitgs) and A (p0V) represent the unusable parts of the internal energy of a closed system for doing useful work in corresponding processes. finally, the relation between Clausius entropy and Boltzmann entropy is discussed based on the comparison of their expressions for absolute entropy.

关键词： entropy macroscopic physical meaning exergy heat interaction