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Closed-Form Solution for a Circular Nanohole with Surface Effects Under Uniform Heat Flux

Acta Mechanica Solida Sinica 2024年第1期37卷 43-52页

作者： Jieyao Tang Jieyan Zhao Haibing Yang Cunfa Gao State Key Laboratory of Mechanics and Control for Aerospace Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China School of Civil Engineering and Transportation South China University of TechnologyGuangzhou 510641China College of Mechanics and Materials Hohai UniversityNanjing 211100China

This paper investigates the steady-state thermoelastic problem of a circular nanohole embedded in an infinitely large elastic plane subjected to a uniform far-field heat flux.A lowly conductive surface model is used to account for the effects of surface phonon scattering,while the complete Gurtin–Murdoch model is utilized to characterize the effects of surface tension and surface *** closed-form solution to the temperature and stress field surrounding the hole is derived in the context of complex variable *** numerical examples are presented to analyze the influence of surface effects on thermal stress *** is shown that surface effects induce notable increases in normal and shear stresses around the ***,all three stress components(hoop,normal,and shear)in the vicinity of the hole exhibit substantial augmentation with increasing surface tension and surface *** particular,it is found that the presence of surface effects amplifies the variation in stress gradients and intensifies stress concentration around the hole.

关键词： Circular nanohole Surface effect Thermal stress Heat flux

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Insights Into the Interfacial Degradation of High-Voltage All-Solid-State Lithium Batteries

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Nano-Micro Letters 2022年第12期14卷 1-13页

作者： Jiawen Li Yuchen Ji Haoran Song Shiming Chen Shouxiang Ding Bingkai Zhang Luyi Yang Yongli Song Feng Pan School of Advanced Material Peking University Shenzhen Graduate SchoolShenzhen 518055People’s Republic of China Guangzhou Key Laboratory of Clean Transportation Energy Chemistry School of Chemical Engineering and Light IndustryGuangdong University of TechnologyGuangzhou 51006People’s Republic of China

Poly(ethylene oxide)(PEO)-based solid polymer electrolyte(SPE)is considered as a promising solid-state electrolyte for all-solid-state lithium batteries(ASSLBs).Nevertheless,the poor interfacial stability with high-voltage cathode materials(e.g.,LiCoO_(2))restricts its application in high energy density solid-state ***,high-voltage stable Li_(3)AlF_(6) protective layer is coated on the surface of LiCoO_(2) particle to improve the performance and investigate the failure mechanism of PEO-based *** phase transition unveils that chemical redox reaction occurs between the highly reactive LiCoO_(2) surface and PEO-based SPE,resulting in structure collapse of LiCoO_(2),hence the poor cycle performance of PEO-based ASSLBs with LiCoO_(2) at charging voltage of 4.2 V vs Li/Li+.By sharp contrast,no obvious structure change can be found at the surface of Li_(3)AlF_(6)-coated LiCoO_(2),and the original layered phase was well *** the charging voltage reaches up to 4.5 V vs Li/Li+,the intensive electrochemical decomposition of PEO-based SPE occurs,leading to the constant increase of cell impedance and directly causing the poor *** work not only provides important supplement to the failure mechanism of PEO-based batter-ies with LiCoO_(2),but also presents a universal strategy to retain structure stability of cathode-electrolyte interface in high-voltage ASSLBs.

关键词： Solid-state battery Poly(ethylene oxide) Surface modification Interface stability High-voltage cathode

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Damage Detection for SMC Benchmark Problem: A Subspace-Based Approach

Damage Detection for SMC Benchmark Problem: A Subspace-Based...

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作者： Zhou, Wensong Li, Shunlong Li, Hui Key Laboratory of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China School of Transportation Science and Engineering Harbin Institute of Technology Harbin150090 China Key Laboratory of Advanced Material and Intelligent Control Technology on Transportation Safety Harbin Institute of Technology Harbin150090 China

A full-scale bridge benchmark problem was issued by the Center of Structural Monitoring and control at the Harbin Institute of technology. The data used in this problem were collected by an in situ structural health monitoring system implemented into a full-scale cable-stayed bridge before and after the bridge was damaged, which is very rare in structural health monitoring field. This benchmark problem will help to verify and/or make comparison of the condition assessment and the damage detection methods, which are usually validated by numerical simulation and/or laboratory testing of small-scale structures with assumed deterioration models and artificial damage. With respect to damage detection of girder, one of the benchmark problems, using the monitored and field testing acceleration data, this paper describes a damage detection method, based on a residual generated from a subspace-based covariance-driven identification method, to detect the damage, and give relative quantitative damage indexes. This method was applied on both two parts of the given benchmark problem, and then detailed discussions and results on this problem are reported in this paper. © 2016 World Scientific Publishing Company.

关键词： Damage detection

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Identification and hazard analysis of landslides triggered by earthquakes and rainfall

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Earthquake Research Advances 2024年第3期4卷 42-54页

作者： Lei Li Yu Zhang Yunlong Hou Bingbing Han Ning An Hui Zhang Ying Ma School of Traffic and Transportation Lanzhou Jiaotong UniversityLanzhou730070China Key Laboratory of Railway Industry on Plateau Railway Transportation Intelligent Management and Control Lanzhou Jiaotong UniversityLanzhou730070China Gansu Institute of Engineering Geology Lanzhou730030China School of Civil Engineering Lanzhou Jiaotong UniversityLanzhou730070China

This study aims to utilize the Small Baseline Subset Interferometric Synthetic Aperture Radar(SBAS-In SAR)technique and Google Earth optical remote sensing images to analyze the area within 20 km around the epicenter of a M 3.9, earthquake that occurred in Tanchang County, Gansu Province, on December 28, 2020. The objective is to identify potential earthquake-induced landslides, assess their scale, and determine their impact range. The study results reveal the successful identification of two potential landslides in the 20 km radius around the epicenter. Through time-series deformation analysis, it was observed that these potential landslides were significantly influenced by both the earthquake and rainfall. Further estimation of these potential landslides indicates maximum depths of 7.4 m and 14.1 m for the failure surfaces, with volumes of 9.02 × 10~4m~3and 25.5 ×10~4m~3, respectively. Finally, based on the simulation analysis of Massflow software, the maximum thickness of soil accumulation in the final accumulation area after sliding of the potential landslide in Shangyaai is 12 m, the area of the final accumulation area is 1.75 × 10~4m~2, and the farthest movement distance is 1124 m. The maximum thickness of soil accumulation in the final accumulation area after sliding of the potential landslide in Wangshancun is 8 m, the area of the final accumulation area is 7.89 × 10~4m~2, and the farthest movement distance is 742 m.

关键词： SBAS-InSAR technology Earthquake Deformation monitoring Landslide Massflow Hazard analysis

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Synthesis and Crystal Structure of (2-Iodo-5-nitrophenyl)-[1-(1-methylazepan-3-yl)-1H-indol-3-yl]methanone

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Chinese Journal of Structural Chemistry 2013年第7期32卷 1100-1104页

作者：李志伟李江胜康绍英刘卫东吴道新曹忠 Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation Changsha University of Science and Technology Hunan Institute of Food Quality Supervision Inspection and Research National Engineering Research Center for Agrochemicals Hunan Research Institute of Chemical Industry

The title compound （2-iodo-5-nitrophenyl）-[1-（1-methylazepan-3-yl）-lH-indol-3- yl]methanone （C22H22IN303, Mr- 503.07 ） was synthesized by the reaction of 3-（2-iodo-5- nitrobenzoyl）indole with 2-chloromethyl-1-methylpiperidine. Its chemical structure was determined by 1H NMR, 13C NMR, DEPT, COSY, HMQC, HMBC, HRMS and X-ray single-crystal diffraction. The crystal belongs to the triclmic system, space group P1 with a = 9.153（4）, b = 10.409（3）, c = 11.882（4） A, a = 71.84（3）, β = 78.67（3）, ）, = 75.49（3）°, V = 1032.7（6） A3, Z = 2, Dc= 1.619 g/era3, = 1.579 mm-1, F（000） = 504, R = 0.0270 and wR = 0.0498 for 3634 observed reflections with I 〉 20（/）. X-ray analysis shows that the indole ring forms a dihedral angle of 84.57（12）° with the iodobenzene ring and the azepane ring adopts a twisted chair conformation. Weak C-H...O hydrogen bonding contributes to the stability and packing of the structure.

关键词： synthesis crystal structure aminoalkylindoles azepane

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Movement and deformation characteristics of overlying rock mass in deep coal seam

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Journal of Mountain Science 2023年第6期20卷 1725-1741页

作者： LI Yong ZHENG Jing WANG Feng-nian HU Chao-wen YANG Fan MA Xin-gen TAO Zhi-gang College of Geoscience and Surveying Engineering China University of Mining and Technology-BeijingBeijing 100083China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology-BeijingBeijing 100083China Shanxi Provincial Transportation Technology Research and Development Co.Ltd. Key Laboratory of Highway Construction and Maintenance Technology in Loess AreaTransportation IndustryTaiyuan 030000China Huaneng Coal Technology Research Co.Ltd. Beijing 100083China State Key Laboratory for Geo Mechanics and Deep Underground Engineering China University of Mining and Technology-BeijingBeijing 100083China School of Mechanics and Civil Engineering China University of Mining and Technology-BeijingBeijing 100083China

The 110 mining method is an innovative and useful coal mining *** mainly relies on two technologies to improve coal mining rate:Top cutting and pressure relief,Negative Poisson’s ratio anchor cable(NPR anchor cable)*** study develops a large-scale physical model test using the speckle monitoring system(DIC),the stress-strain monitoring system,and the infrared thermal imaging system to deeply investigate the roadway deformation and failure law of the 110 mining method,the displacement movement mechanism of the overlying rock mass,and the change law of rock *** showed that pillarless coal mining utilizing mine pressure and rock fragmentation and expansion characteristics,the use of cut top pressure relief and NPR anchor stress compensation technology in the kilometer level of deep underground coal mining still has a positive effect along the tunnel *** addition,they can reduce surface subsidence,provide a scientific basis for ecological protection,and develop other kilometer-level deep soft rock high-ground stress underground projects.

关键词： Cut seam Displacement NPR anchor cable Physical model Numerical simulation

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Neural network-based connectivity reliability analysis for bridge networks 12th

Neural network-based connectivity reliability analysis for b...

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12th International Conference on Bridge Maintenance, Safety and Management, IABMAS 2024

作者： Wang, Jie Li, Shunlong School of Transportation Science and Engineering Harbin Institute of Technology Harbin China Key Laboratory of Intelligent Disaster Prevention for Civil Infrastructure Ministry of Industry and Information Technology China

ISBN: (纸本)9781032770406

The connectivity reliability analysis of bridge networks has been the focus of research in this field and is also a difficult problem because of NP-hard problem. In particular, when performing network strategy or optimization, it is very time-consuming as the network connectivity probabilities need to be solved hundreds of times. This study finds that neural network with fewer neurons and layers can quickly and efficiently solve the all-terminal connectivity reliability for large-scale bridge networks. Firstly, for the same network benchmark model, based on real bridge inspection data, the state probability samples of each edge in the network are extracted by data fitting, and Monte Carlo simulation is applied to approximate the allterminal connectivity reliability of each network model under each sample. Secondly, multiple neural network models containing one, two and three layers with different neurons are proposed and 5-fold cross-validation is applied to obtain the hyperparameters of each model. Finally, in conjunction with appropriate optimizers and hyperparameters, it can be shown that simple single-layer network models can find sufficiently accurate all-terminal connectivity reliability for large-scale bridge network. The accuracy and efficiency of the pro-posed method is verified based on a real bridge network containing 216 directed edges with 63 nodes. © 2024 The Author(s).

关键词： Reliability analysis

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Driving Performance Analysis for Connected Vehicle Platoons: Velocity Perturbation and Fuel Consumption

Driving Performance Analysis for Connected Vehicle Platoons:...

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2023 IEEE International Conference on Unmanned Systems, ICUS 2023

作者： Zhao, Yihan Duan, Xuting Zhou, Jianshan Zhang, Long School of Transportation Science and Engineering Beihang University Beijing China State Key Lab of Intelligent Transportation System Beijing Key Laboratory for Cooperative Vehicle Infrastructure Systems and Safety Control Beijing China State Key Lab of Intelligent Transportation System Beijing Key Laboratory for Cooperative Vehicle Infrastructure Systems and Safety Control Zhongguancun Laboratory Beijing China National Key Laboratory of Science and Technology on Information System Security Institute of Systems Engineering Beijing China

ISBN: (纸本)9798350316308

Vehicle platoon is one of the concrete manifestations of multi-vehicle cooperative control and intelligent transportation. However, the velocity perturbation in the driving process will bring about stability and safety problems. The connected autonomous vehicles (CAVs) can obtain the motion status of the lead vehicle in real time and respond to it in time, which is of far-reaching significance to platoon control. Based on this, this paper focuses on the longitudinal driving strategy of connected autonomous vehicle platoons. Specifically, we provide a discrete double-integral model controller for each vehicle in a generic scenario, and the controller performs acceleration and deceleration control at each timeslot according to the state of the vehicle in front and its own state. Simulation experiments are designed by varying the size of the platoon and the number of connected autonomous vehicles. The experimental results show that the introduction of connected autonomous vehicles can effectively suppress the platoon velocity perturbation, increase the stability of the platoon driving, and significantly reduce the fuel consumption at the same time. © 2023 IEEE.

关键词： Autonomous vehicles

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An almost full reversible lithium-rich cathode: Revealing the mechanism of high initial coulombic efficiency

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Journal of Energy Chemistry 2021年第11期30卷 120-126,I0003页

作者： Dong Luo Jianming Fan Zhuo Yao Huixian Xie Jiaxiang Cui Yajun Yang Xiaokai Ding Jiapeng Ji Shuxing Wu Ming Ling Chenyu Liu Zhan Lin Guangzhou Key Laboratory of Clean Transportation Energy Chemistry School of Chemical Engineering and Light IndustryGuangdong University of TechnologyGuangzhou 510006GuangdongChina Fujian Provincial Key Laboratory of Clean Energy Materials College of Chemistry and MaterialsLongyan UniversityLongyan 364012FujianChina Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027ZhejiangChina

Low initial Coulombic efficiency (ICE) is an important impediment to practical application of Li-rich layered oxides (LLOs), which is due to the irreversible oxygen release. It is generally considered that surface oxygen vacancies are conducive to the improvement of ICE of LLOs. To reveal the relation of oxygen vacancies and ICE, sample PLO (Li-Mn-Cr-O) and its treated product (TLO) are comprehensive investigated in this work. During the treated process, part of oxygen atoms return to original constructed vacancies. It makes oxygen vacancies in sample TLO much poorer than those in sample PLO, and induces the formation of Li-poor spinel-layered integrated structure. Electrochemical measurement indicates the ICE of sample PLO is only 80.8%, while sample TLO is almost full reversible with the ICE of ~97.1%. In term of high-energy X-ray diffraction, scanning transmission electron microscopy, X-ray photoelectron spectroscopy and synchrotron hard/soft X-ray absorption spectroscopy, we discover that the ICE is difficult to be improved significantly just by building oxygen vacancies. LLOs with high ICE not only have to construct suitable oxygen vacancies, but also require other components with Li-poor structure to stabilize oxygen. This work provides deep insight into the mechanism of high ICE, and will contribute to the design and development of LLOs for next-generation high-energy lithium-ion batteries.

关键词： Li-ion batteries Li-rich layered oxides Initial coulombic efficiency Oxygen vacancies

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Optimal control of Reinforced Plate Based on the Minimum Energy

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Transactions of Nanjing University of Aeronautics and Astronautics 2016年第2期33卷 166-172页

作者： Liu Lu Qiu Jinhao Ji Hongli Liu Canchang State Key Laboratory of Mechanics and Control of Mechanical Structures College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 P. R. China School of Transportation and Vehicle Engineering Shandong University of Technology Ziho 255049 P.R. China

An optimal control method based on the minimum energy of the vibration system is proposed for piezoelectric damping control of the reinforced aircraft ***,the dynamic equations of the piezoelectric damping reinforced plate system and the state space equations are *** method to determine the weight matrix of the system is presented based on the minimum energy of the vibration *** order to obtain the optimal controller,the control parameters of the feedback controller are obtained by using the optimal method.A piezoelectric vibration optimal control experiment platform is designed to control the vibration of reinforced aircraft *** experimental results show that the method has good control performances.

关键词： vibration damping optimal control piezoelectric linear vibration control

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