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Significant strain-rate dependence of sensing behavior in Ti0_(2)@carbon fibre/PDMS composites for flexible strain sensors

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Journal of Advanced Ceramics 2021年第6期10卷 1350-1359页

作者： Fan ZHANG Hailong hu Simin hu Jianling YUE School of Minerals Processing and Bioengineering Central South UniversilyChangsha 410083China School of Aeronautics&Astronautics Central South UniversityChangsha 410083China Research Center in Intelligent Thermal Structures for Aerospace Central South UniversityChangsha 410083China

Carbon fibre(CF)embedded into elastomeric media has been attracting incredible interest as flexible strain sensors in the application of skin electronics owing to their high sensitivity in a very small strain *** further improve the sensitivity of CF/PDMS composite strain sensor,the relatively low temperature prepared TiO_(2) nanowire via hydrothermal route was employed herein to functionalize *** results showed a significant increase in the sensitivity of the TiO_(2)@CF/PDMS composite strain sensors which was reflected by the calculated gauge *** the prepared TiO_(2) nanowire vertically embraced the surroundings of the CF,the introduced TiO_(2) nanowire contributed to a highly porous structure which played a predominant role in improving the sensitivity of strain ***,the significant strain rate dependent behavior of TiO_(2)@CF/PDMS strain sensor was revealed when performing monotonic tests at varied strain ***,introducing TiO_(2) nanowire on CF offers a new technique for fabricating flexible strain sensors with improved sensitivity for the application of flexible electronics.

关键词： composites dependence of strain rate sensitivity flexible strain sensors

Entropy based inverse design of aircraft mission success space in system-of-systems confrontation

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Chinese Journal of Aeronautics 2021年第12期34卷 99-109页

作者： Yuan GAO Yongliang TIAN hu LIU Jianwen hu School of Aeronautic Science and Engineering Beihang UniversityBeijing 100083China Chinese Academy of Military Science Beijing 100091China

This paper presents a practical and efficient design method for aircraft Mission Success Space(MSS)based on the entropy measurement(EM).First,fundamentals regarding MSS,Inverse Design(ID)and entropy are ***,two EM schemes of entropy-based ID and the whole MSS ID procedure are given to demonstrate alternative ways of entropy quantification and MSS *** that,Genetic Algorithm(GA)is utilized as a search algorithm to find the optimal MSS design with the minimum objective,entropy,in each EM scheme.A simulation case of aircraft penetration mission is given for the method validation where the best aircraft MSS design is obtained by GA according to the minimum *** from two schemes are compared at the end.

关键词： Effectiveness evaluation Entropy Inverse design Military missions Mission success space System of systems(SoS)

数字赋能乡村教育现代化的实然困境与优化路径

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教学与管理 2025年第1期 6-11页

作者：王倩吴家华胡恒钊安徽大学马克思主义学院合肥230601 江西农业大学马克思主义学院南昌330045

以数字赋能为发展契机,推进乡村教育现代化是中国式教育现代化的必然要求,也是乡村全面振兴的重要依托。在教育领域,数字技术蕴含着驱动乡村教育现代化发展的重要价值,能够有效扩大优质教育资源的覆盖范围、变革乡村教育形态、推动乡土... 详细信息

以数字赋能为发展契机,推进乡村教育现代化是中国式教育现代化的必然要求,也是乡村全面振兴的重要依托。在教育领域,数字技术蕴含着驱动乡村教育现代化发展的重要价值,能够有效扩大优质教育资源的覆盖范围、变革乡村教育形态、推动乡土文化的交流传播。但在推动数字赋能乡村教育现代化的实践中,面临着数字教育观念淡薄、数字基础条件不足、师生数字素养薄弱等现实阻碍,迫切需要从重塑价值观念、完善数字设施、培养师生数字素养、加强体制建设入手,为数字赋能乡村教育现代化发展注入新动力,以适应中国式教育现代化发展的新生态。

关键词：数字赋能乡村教育中国式教育现代化乡土文化

Preparation of a novel cross-linked polyetherimide with enhanced breakdown strength and high-temperature energy storage performance

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High Voltage 2023年第3期8卷 630-639页

作者： Guangyu Duan Fengying hu Ruina Zhang Zuming hu College of Materials Engineering Henan University of EngineeringZhengzhouChina Henan Engineering Technology Research Center for Fiber Preparation and Modification Henan University of EngineeringZhengzhouChina State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Donghua UniversityShanghaiChina

Polymer dielectrics with excellent energy storage performance at high temperature are urgently needed in advanced applications,such as hybrid electric vehicles,smart grid and pulsed power ***(PEI),which is supposed to be the most promising candidate among polymer dielectric materials,displays a limitation for high-temperature polymer dielectrics owing to the rapidly decreasing discharged energy density(U_(d))and charge-discharge efficiency(η).Herein,a novel PEI with cross-linked networks was firstly prepared by utilising 2,4,6-Triaminopyrimidine(TAP)as a *** results showed that the breakdown strength of the cross-linked PEI(c-PEI)with 2 wt%TAP increased to 399.4 MV/m,showing an increment of 23.3%in comparison with noncross-linked ***,owing to the restrained polarisation loss and relaxation loss by cross-linked networks,the dielectric loss of c-PEI dielectric gradually decreased with the increasing content of *** particular significance was the c-PEI dielectrics exhibiting improved U_(d)andηat high *** maximum U_(d)of c-PEI with 2 wt%TAP was 2.53 J/cm3 at 150℃,which was 24.8%higher than non-cross-linked PEI(2.11 J/cm^(3)at 150℃).This research provides an innovative strategy to achieve novel PEI dielectrics with improved U_(d)andηat high temperature.

关键词： breakdown dielectric strength

Coupling Vibration of Simply-Supported Damping Beam Carrying a Moving Mass

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Acta Mechanica Solida Sinica 2022年第6期35卷 972-978页

作者： Jingjing hu Weipeng hu Chuan Xiao Zichen Deng School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’an710072China School of Civil Engineering and Architecture Xi’an University of TechnologyXi’an710048China State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China Xi’an University of TechnologyXi’an710048China China Research and Development Academy of Machinery Equipment Beijing100089China

The coupling dynamic problems,such as the vehicle-bridge interaction problem,are difficult to be *** this paper,the generalized multi-symplectic approach is employed to investigate the coupling dynamic behaviors in the vehicle-bridge interaction system.A simply-supported damping beam model carrying a moving mass is considered and the generalized multi-symplectic form with the dynamical symmetry breaking factors is deduced *** then,Preissmann’s scheme is employed to discretize the generalized multi-symplectic form,and the discrete structure-preserving condition for the numerical scheme is *** to the discrete structure-preserving condition,the permitted moving speed of the mass with different damping factors and different time step lengths is obtained to ensure the structure-preserving properties of the numerical ***,the effects of the damping factor of the beam and the moving speed of the mass on the vibration of the beam are investigated by Preissmann’s *** main contribution of this work is to provide a structure-preserving analysis approach for the vehicle-bridge interaction problem.

关键词： Vehicle-bridge interaction Dynamical symmetry breaking Generalized multi-symplectic Hamiltonian Moving mass

A classical relativistic hydrodynamical model for strong EM wave-spin plasma interaction

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Plasma Science and Technology 2022年第3期24卷 14-18页

作者： Qianglin hu Wen hu Department of Physics Jinggangshan UniversityJi'an 343009People's Republic of China

Based on the covariant Lagrangian function and Euler-Lagrange equation,a set of classical fluid equations for strong EM wave-spin plasma interaction is *** shows that the relativistic effects may affect the interaction processes by three factors:the relativistic factor,the time component of four-spin,and the velocity-field *** set of equations can be used to discuss the collective spin effects of relativistic electrons in classical regime,such as astrophysics,high-energy laser-plasma systems and so *** an example,the spin induced ponderomotive force in the interaction of strong EM wave and magnetized plasma is *** show that the time component of four-spin,which approaches to zero in nonrelativistic situations,can increase the spin-ponderomotive force obviously in relativistic situation.

关键词： Lagrangian function strong EM wave spin plasma spin ponderomotive force

Potential friendship discovery in social networks based on hybrid ensemble multiple collaborative filtering models in a 5G network environment

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Digital Communications and Networks 2022年第6期8卷 868-876页

作者： Hexuan hu Zhenzhou Lin Qiang hu Ye Zhang Key Laboratory of Water Big Data Technology of Ministry of Water Resources Hohai UniversityNanjingChina College of Computer and Information Hohai UniversityNanjingChina Office of Teaching Affairs Nanjing University of Finance and EconomicsNanjingChina Electric Engineering College Tibet Agriculture&Animal Husbandry UniversityTibetChina

At present, 5G network technology is being applied to various social network modes, and it can provide technical and traffic support for social networks. Potential friendship discovery technology in 5G-enabled social networks is beneficial for users to make potential friends and expand their range of activities and social hierarchy, which is highly sought after in today's social networks and has great economic and application value. However, the sparsity of the dominant user association dataset in 5G-enabled social networks and the limitations of traditional collaborative filtering algorithms are two major challenges for the friend recommendation problem. Therefore, in order to overcome these problems regarding previous models, we propose a Hybrid Ensemble Multiple Collaborative Filtering Model (HEMCF) for discovering potential buddy relationships. The HEMCF model draws on a special autoencoder method that can effectively exploit the association matrix between friends and additional information to extract a hidden representation of users containing global structural information. Then, it uses the random walk-based graph embedding algorithm DeepWalk to extract another hidden representation of users in the buddy network containing local structural information. Finally, in the output module, the HEMCF model stacks and multiplies the two types of hidden representations of users to ensure that the information mentioned above is concentrated in the final output to generate the final prediction value. The magnitude of the prediction value represents the probability of the users being friends, with larger values representing a high probability of the two users being friends, and vice versa. Experimental results show that the proposed method boosts the accuracy of the relationship prediction over baselines on 3 real-world public datasets dramatically.

关键词： 5G network Social network Collaborative filtering Recommendation system Friendship discovering

Model of Stabilizing Continuous Unidirectional Solidification Process

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Journal of Materials Science & Technology 2001年第1期17卷 107-108页

作者： hu ZHANG Guowei CHANG Hanqi hu Dept.of Materials Science and Engineering BeiJing University of Aeronautics and AstranauticsBeijing 100083China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China

The relation of the related parameters concerning the continuous unidirectional solidification process is derived by means of the theoretical analysis of the heat transfer, the theoretical model is verified by experim... 详细信息

关键词： solidification process theoretical model heat transfer

Recent developments of infrared photodetectors with lowdimensional inorganic nanostructures

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Nano Research 2022年第2期15卷 805-817页

作者： Xin hu Jianghong Wu Mingzhou Wu Junqing hu College of Health Science and Environmental Engineering Shenzhen Technology UniversityShenzhen 518118China

Low-dimensional inorganic nanostructures such as quantum dots as well as one-and two-dimensional nanostructures are widely studied and already used in high-performance infrared *** structures feature large surface-to-volume ratios,tunable light absorption,and electron-limiting *** article reviews the state-of-the-art research of low-dimensional inorganic nanostructures and their application for infrared *** to nano-structuring,a narrow bandgap,hybrid systems,surface-plasmon resonance,and doping,many common semiconductors have the potential to be used for infrared *** basic approaches towards infrared detection are ***,a selection of very important and special nanostructured materials and their remarkable infrared-detection properties are introduced(e.g.,black phosphorus,graphene-based,MoX_(2)-based,Ⅲ-Ⅶ group).Each section in this review describes the corresponding photosensitive properties in *** article concludes with an outlook of anticipated future developments in the field.

关键词： infrared photodetectors low-dimensional inorganic nanostructures hybrid structures