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新旧桥梁桥面板连接施工中抗扰动混凝土的应用

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工程技术研究 2024年第14期9卷 121-123页

作者：蒋汉青广东冠粤路桥有限公司广东广州510000

某高速公路工程新旧桥梁桥面层拼接施工需确保旧桥通行,给拼接混凝土质量带来了一定的影响。文章结合现场施工和质量检验等情况,提出在不影响道路通行的前提下,运用先进的抗干扰混凝土工艺,结合实施科学的交通引导措施,有效地解决新旧... 详细信息

某高速公路工程新旧桥梁桥面层拼接施工需确保旧桥通行,给拼接混凝土质量带来了一定的影响。文章结合现场施工和质量检验等情况,提出在不影响道路通行的前提下,运用先进的抗干扰混凝土工艺,结合实施科学的交通引导措施,有效地解决新旧桥梁桥面板之间的衔接问题,从而确保混凝土衔接的质量。

关键词：抗扰动混凝土新旧桥梁桥面板连接

Rapid identification of switched systems: A data-driven method in variational framework

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Science China(Technological Sciences) 2021年第1期64卷 148-156页

作者： LI Chunjiang HUANG ZhiLong WANG Yong jiang hanqing Department of Engineering Mechanics Zhejiang UniversityHangzhou 310027China School for Engineering of Matter Transport and EnergyArizona State UniversityTempe AZ 85287USA

Switched systems, i.e., systems changing the parameter values(even structural forms) abruptly and randomly at arbitrary instants, have been extensively utilized in many fields of modern industries. Rapid identification of switched systems, i.e.,capturing all the changing instants and reconstructing the mathematical models rapidly, is of great significance for behavior prediction, performance evaluation and possible control, but is restricted by small data amount available. Here, the rapid identification problem is successfully solved by a data-driven method in variational framework. The data-driven method only requires a small amount of data due to the compact form of the variational description, and is robust to data noise due to the holistic viewpoint. Two numerical examples, i.e., Duffing oscillator and van der Pol system(as two representative systems in nonlinear dynamics), are adopted to illustrate its application, efficiency and robustness to noise.

关键词： switched system rapid identification data-driven method small data amount robustness

The effect of large deformation and material nonlinearity on gel indentation

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Acta Mechanica Sinica 2012年第4期28卷 1058-1067页

作者： Zheng Duan Yonghao An Jiaping Zhang hanqing jiang Transport and Energy Arizona State UniversityTempe AZ 85287 USA

A gel, an aggregate of polymers with solvents, has dual attributes of solid and liquid as solvent migrates in and out of the polymer network. Indentation has recently been used to characterize the mechanical properties of gels. This paper evaluates the effects of large deformation and material nonlinearity on gel indentation through theoretical modeling and finite element analysis. It is found that large deformation significantly affects the interpretation of the experimen- tal observations and the classical relation between indenta- tion force and depth has limitations for large deformation. The material nonlinearity does not play a very important role on indentation experiment so that the poroelasticity is a good approximation. Based on these observations, this paper proposes an alternative approach to measure the mechanical properties of gels, namely, uniaxial compression experiment.

关键词： Gel indentation Large deformation Finite element simulation

Thickness evolution of graphite-based cathodes in the dual ion batteries via in operando optical observation

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Journal of Energy Chemistry 2019年第2期28卷 122-128页

作者： Na Li Yaoda Xin Haosen Chen Shuqiang Jiao hanqing jiang Wei-Li Song Daining Fang Institute of Advanced Structure Technology Beijing Institute of Technology Beijing Key Laboratory of Lightweight Multi-Functional Composite Materials and Structures Beijing Institute of Technology Overseas Education College Nanjing University of Technology Collaborative Innovation Center of Electric Vehicles in Beijing Beijing Institute of Technology State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing School for Engineering of Matter Transport and EnergyArizona State University State Key Laboratory for Turbulence and Complex Systems College of EngineeringPeking University

Graphite has been currently considered as a promising cathode material in dual ion batteries(DIBs)due to its unique features of sp2 hybridized carbon and stacked two-dimensional layered ***,unexpected volume/thickness changes in the graphite cathodes,induced by the intercalation/deintercalation of anions with large molecular size have been known to be a critical problem in designing DIB *** understand the volume/thickness changes in the DIB electrodes,in operando optical observing apparatus has been employed to observe the cross-section view of a graphite-based cathode upon cycles in the present *** observation suggests that the cathode initially presented a huge irreversible thickness change(60%),and such thickness variation was prone to reduce and remain <20% in the following *** results from both in operando observation and electrochemical characterizations collectively indicate that the greater thickness variation at initial cycle should be attributed to both anion intercalation into graphite-based cathodes and irreversible decomposition of chemical components in the DIB *** method here highlights a universal route for fundamentally understanding the electrodes of huge volume variation.

关键词： Dual ion batteries In operando optical observation Graphite Cathode Thickness evolution

RATE DEPENDENT STRESS-STRETCH RELATION OF DIELECTRIC ELASTOMERS SUBJECTED TO PURE SHEAR LIKE LOADING AND ELECTRIC FIELD

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Acta Mechanica Solida Sinica 2012年第5期25卷 542-549页

作者： Shaoxing Qu Ke Li Tiefeng Li hanqing jiang Miao Wang Zhenhua Li Department of Engineering Mechanics Zhejiang UniversityHangzhou 310027China Soft Matter Research Center(SMRC) Zhejiang UniversityHangzhou 310027China School for Engineering of Matter Transport and Energy~4rizona State UniversityTemPeAZ 85287USA Department of Physics Zhejiang UniversityHangzhou 310027China

The performance of dielectric elastomer （DE） transducers is significantly affected by viscoelastic relaxation-induced electromechanical dissipations. This paper presents an experi- mental study to obtain the rate dependent stress-stretch relation of DE membranes （VHBTM9473） subjected to pure shear like loading and electric loading simultaneously. Stretching rate depen- dent behavior is observed. The results also show that the tensile force decreases as the voltage increases. The observations are compared with predictions by a viscoelastic model of DE. This experiment may be used for further studies of dynamic electromechanical coupling properties of DEs.

关键词： dielectric elastomer viscoelastic electromechanical coupling membranes

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基于密码的卫星互联网安全防护体系研究

信息安全与通信保密 2024年第2期 31-39页

作者：梁丽木姬少培金星虎颜亮姜汉卿中国电子科技集团公司第三十研究所四川成都610041 航天恒星科技有限公司北京100089 中国星网网络研究院有限公司北京100089

卫星互联网作为一种新型的空间网络信息基础设施,具有广覆盖、低延时、低成本、地面通信的重要补充、备份、延伸角色等优点,但同时随着卫星互联网技术的不断发展和应用,卫星互联网安全防护问题日益突出,面临着诸多安全威胁,如卫星节点... 详细信息

卫星互联网作为一种新型的空间网络信息基础设施,具有广覆盖、低延时、低成本、地面通信的重要补充、备份、延伸角色等优点,但同时随着卫星互联网技术的不断发展和应用,卫星互联网安全防护问题日益突出,面临着诸多安全威胁,如卫星节点暴露、通信信道开放、异构网络互联、拓扑动态变化、处理能力受限等。针对这些安全威胁,以密码技术为核心,提出了一种基于密码的卫星互联网安全防护体系,包括物理设施安全防护、通信链路安全防护、计算机系统和网络安全防护、数据安全防护、业务应用安全防护等多个方面,并介绍了基于密码的卫星互联网安全防护实践,以及卫星互联网安全防护未来的发展趋势。

关键词：卫星互联网安全威胁密码技术安全防护体系

Optimal combination of the correction model and parameters for the precision geometric correction of UAV hyperspectral images

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International Journal of Agricultural and Biological Engineering 2024年第3期17卷 173-184页

作者： Wenzhong Tian Za Kan Qingzhan Zhao Ping jiang Xuewen Wang hanqing Liu College of Mechanical and Electrical Engineering Shihezi UniversityShihezi 832000XinjiangChina Research Center for Space Information Engineering Technology Shihezi 832000XinjiangChina XPCC Division of National Remote Sensing Center of China Shihezi 832000XinjiangChina College of Information Science and Technology Shihezi UniversityShihezi 832000XinjiangChina

Nowadays,with the rapid development of quantitative remote sensing represented by high-resolution UAV hyperspectral remote sensing observation technology,people have put forward higher requirements for the rapid preprocessing and geometric correction accuracy of hyperspectral *** optimal geometric correction model and parameter combination of UAV hyperspectral images need to be determined to reduce unnecessary waste of time in the preprocessing and provide high-precision data support for the application of UAV hyperspectral *** this study,the geometric correction accuracy under various geometric correction models(including affine transformation model,local triangulation model,polynomial model,direct linear transformation model,and rational function model)and resampling methods(including nearest neighbor resampling method,bilinear interpolation resampling method,and cubic convolution resampling method)were ***,the distribution,number,and accuracy of control points were analyzed based on the control variable method,and precise ground control points(GCPs)were *** results showed that the average geometric positioning error of UAV hyperspectral images(at 80 m altitude AGL)without geometric correction was as high as 3.4041 m(about 65 pixels).The optimal geometric correction model and parameter combination of the UAV hyperspectral image(at 80 m altitude AGL)used a local triangulation model,adopted a bilinear interpolation resampling method,and selected 12 edgemiddle distributed *** correction accuracy could reach 0.0493 m(less than one pixel).This study provides a reference for the geometric correction of UAV hyperspectral images.

关键词： geometric correction hyperspectral images unmanned aerial vehicle(UAV) ground control point(GCP)

华东地区地方院校图书馆19年协作活动的回顾与思考

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大学图书馆学报 2010年第1期28卷 46-50页

作者：姜汉卿盐城师范学院图书馆盐城224002

华东地区地方院校图书馆的协作活动已开展19年,走过了一段光辉的历程,取得了丰硕成果,积累了丰富经验,为华东地区地方院校图书馆的振兴和发展做出了贡献,也在全国扩大了影响。实践证明,图书馆事业要发展,必须大力开展协作和共享;开展协... 详细信息

华东地区地方院校图书馆的协作活动已开展19年,走过了一段光辉的历程,取得了丰硕成果,积累了丰富经验,为华东地区地方院校图书馆的振兴和发展做出了贡献,也在全国扩大了影响。实践证明,图书馆事业要发展,必须大力开展协作和共享;开展协作活动,必须审时度势、科学发展,必须持之以恒、讲求实效。

关键词：图书馆事业高校图书馆图书馆协作资源共享科学发展

基于多个手持摄像机的动态场景时空一致性深度恢复

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计算机辅助设计与图形学学报 2013年第2期25卷 137-145页

作者：姜翰青章国锋谭平鲍虎军浙江大学CAD&CG国家重点实验室杭州310058 Department of Electrical and Computer Engineering National University of Singaporesingapore117576

针对现有的动态场景深度恢复方法普遍需要较多数目的同步摄像机才能获得理想深度估计的问题,提出一个能够从2～3个手持摄像机所拍摄的同步视频序列中自动地恢复出高质量的深度图序列的鲁棒、便捷的动态场景稠密深度恢复方法.首先对不同... 详细信息

针对现有的动态场景深度恢复方法普遍需要较多数目的同步摄像机才能获得理想深度估计的问题,提出一个能够从2～3个手持摄像机所拍摄的同步视频序列中自动地恢复出高质量的深度图序列的鲁棒、便捷的动态场景稠密深度恢复方法.首先对不同序列同一时刻的图像帧进行匹配以完成每帧的深度初始化,然后采用一种新的双层分割方法在手持摄像机自由移动的情况下将像素进行静动态分类,并对静态和动态像素点采用不同的方式进行时空一致性的深度优化.特别地,文中采用了一个基于多帧统计信息、迭代式的优化框架,使得深度优化与双层分割在该优化框架之下交替迭代地进行,最终实现高质量的动态场景的分割和深度恢复.最后通过各种动态场景实例证明了文中方法的鲁棒性和有效性.

关键词：动态场景时空一致性深度恢复双层分割