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第三届绿色建筑与环境管理国际学术会议

作者： Z B Sheng C L Deng J B Xiong Key Laboratory of Durability Technology for Harbor and Marine Structure Ministry of Communications CCCC Fourth Harbor Engineering Institute Co. Ltd.

Based on analysis of crack problem of chamber wall ship lock expansion project in Jiepai province,the related research of countermeasures have been made,to solve the cracks occurs in the *** countermeasure of cracks are analysed by monitoring internalexternal temperature and shrinkage stress of chamber *** is provided that the rational measures could make less cracks occur,including fiber lattice with curing of insulation and moisture materials and optimization of proportion mix.A series of investigations are carried out insitu and prove countermeasures of cracking control *** paper states the technical details and developing of inner temperature and shrinkage in chamber wall by adopting above measures.

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Bayesian Framework for Multi-User Cooperative Radio SLAM 35

Bayesian Framework for Multi-User Cooperative Radio SLAM

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35th IEEE International Symposium on Personal, Indoor and Mobile Radio communications, PIMRC 2024

作者： Que, Hang Yang, Jie Du, Tao Xia, Shuqiang Wen, Chao-Kai Jin, Shi Southeast University National Mobile Communications Research Laboratory Nanjing211189 China Southeast University Frontiers Science Center for Mobile Information Communication and Security Nanjing210096 China Southeast University Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education Nanjing210096 China Zte Corporation Shenzhen518001 China State Key Laboratory of Mobile Network and Mobile Multimedia Technology Shenzhen518001 China Institute of Communications Engineering National Sun Yat-sen University Kaohsiung804 Taiwan

ISBN: (纸本)9798350362244

The advancement of millimeter-wave communication technology heralds new sensing capabilities. By leveraging channel multipath parameter estimates, we can harness simultaneous localization and mapping (SLAM) for precise user equipment (UE) localization and radio map construction in 6 G communication systems. Particularly in multi-UE scenarios, SLAM empowers base stations to amalgamate the local radio maps of various UEs efficiently. This study introduces a novel Bayesian framework specifically designed for multi-UE SLAM, complemented by a tailored factor graph. We also unveil a two-stage multi-UE SLAM algorithm. Our simulation results reveal that this algorithm substantially enhances radio map construction accuracy by 4 8. 5 % and UE localization accuracy by 13.5 %, outperforming single-UE cases. Moreover, the algorithm demonstrates remarkable adaptability to environmental changes, showcasing its potential for long-term evolution in dynamic settings. © 2024 IEEE.

关键词： Long Term Evolution (LTE)

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Modified damage assessment and repair design for underpass bridge based on fire effect

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key engineering Materials 2014年 574卷 67-76页

作者： Li, Zhonglong Wu, Honglin Zhu, Xiaodi Gu, Hongjiang Liu, ZhenYu Yin, Tao School of Transportation Science and Engineering Harbin Institute of Technology Harbin 150090 China Key Laboratory of Advanced Material and Intelligent Control Technology on Transportation Safety Ministry of Communication 150090 China Postdoctoral Station of Mechanics Harbin Institute of Technology Harbin 150090 China Communications Research Institute of Liaoning Province Shenyang 110015 China School of Civil Engineering Southwest Jiao Tong University Chengdu 614202 China China Railway Fifth Survey and Design Institute Group Co. Ltd. Northeast Branch China

ISBN: (纸本)9783037858172

Due to the fire effect, a frame underpass bridge had suffered a huge damage in Changjiang road in Harbin in the direction to Acheng. One span of the bridge was burned in large area, parts of which were burned badly. Many adjacent beams turned black at bottom of roofs;parts decoration of side wall were damaged to some extent. As a result, both directions of the traffic were disrupted, causing traffic jams. To make sure of repairing and restoring the traffic during the shortest period, Harbin municipal committee established the Changjiang road rescue headquarters. Under the precondition of utmost to save money and ensure that the repaired underpasses technology standards meet the design requirements, the research group were about to use steel plate or carbon fiber sheet as the reinforcing material, after detecting and identifying the bridge damage. Through a comprehensive consideration for the ascension of normal section bearing capacity of two reinforcing materials, pasting carbon fiber sheet was adopted to complete repair reinforcement scheme. © (2014) Trans Tech Publications.

关键词： Roads and streets

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Research on Improvement Effect and Mechanism of Metakaolin on Concrete Drying Shrinkage

Research on Improvement Effect and Mechanism of Metakaolin o...

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The 14th International Congress on the Chemistry of Cement（ICCC 2015）

作者： Junjie Zeng Shengnian Wang Zhihong Fan Jianbo Xiong Key laboratory of Harbor & Marine Structure Durability Technology of the Ministry of Communications CCCC Fourth Harbor Engineering Institute Co.Ltd.

Metakaolin(MK) with high pozzolanic reactivity was produced by calcination of *** order to explore the effect of MK on concrete drying shrinkage,mortars and pastes with MK and silica fume(SF) were *** the preparation of mortars and pastes,cement was solely substituted by 0%,6%,12% of MK and SF,and double substituted by 30% of fly ash(FA) and 6% of MK,as well as by 30% of slag(GGBS) and 6% of *** specimens were pre-cured in water for 3d and 14 d respectively,followed by a drying process at 20 ℃ and 60% relative *** shrinkage and weight loss of the mortars were tested during the drying ***,pore structure of the mortars was tested by MIP,while the hydrates of the pastes were tested by XRD and thermal *** of the shrinkage and weight loss tests show that MK and SF both reduce the 90 d drying shrinkage of the mortars,while MK leads to a higher *** higher the MK replacement level,the lower the mortar drying *** SF mortars,the drying shrinkage of mortar with 12% SF is higher than mortar with 6% *** incorporation of FA further decreases the drying shrinkage of mortars with MK,while GGBS increases drying shrinkage of the *** mortars pre-cured for 3d,the drying shrinkage of the MK or SF mortars was proportional to the weight loss,while the incorporation of FA or GGBS decreases the fitting determination *** all mortars pre-cured for 14 d,the drying shrinkage correlated better with the weight *** tests reveal that MK refines the pore size distribution of *** of pores with size between 10 nm and 50 nm are *** and thermal analysis tests show that MK decreases the content of CH,both at 3d and 14 *** pastes with MK,ettringite is found not only after the pre-cured ages of 3d and 14 d,but also during the drying *** Metakaolin(MK) is a highly reactive pozzolan which can be obtained by calcining kaolin *** researches focus on the probability of

关键词： metakaolin silica fume drying shrinkage mass loss microstructure

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Method study for RT-Flex HPCR low-speed diesel engine injecting law measuring

Method study for RT-Flex HPCR low-speed diesel engine inject...

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International Conference on Mechanical and Electrical technology (ICMET)

作者： Zheng Wang Jian-guo Yang Energy and Power Engineering School Wuhan University of Technology Wuhan China Key Laboratory of Marine Power Engineering & Technology under Ministry of Communications Wuhan University of Technology Wuhan China

For researching the injecting law of low-speed HPCR diesel engine, a novel measuring method is invited. This method provide a certain reference to solve the problem that RT-Flex HPCR low-speed diesel engine fuel injection law can not be measured directly under the present conditions. Under different load working conditions on the RT-Flex60C low-speed diesel engine HPCR (high pressure common-rail) HIL(Hardware In the Loop)test platform, pressure curves at the outlet of high-pressure fuel pipe where connected with injector are measured, and a multi-hole injector model of RT-Flex60C diesel engine is built with AMESim. Inputted the pressure curves into the model with ASCII code files, characteristic curves such as needle lift, injector injecting rate, injecting rate and pressure of each hole on nozzle, fuel quantity injected and returned during 180 second are calculated. Experimental result indicated that the calculated needle lift curves are consistent with the curves measured on test platform, the injected and returned fuel quantity during 180 second are in line with the data measured on real engine.

关键词： Displacement measurement

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An SNR-Adaptive Relaying Algorithm for Multi-Antenna Cooperative Networks

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China communications 2017年第10期14卷 228-236页

作者： Shuangshuang Han Peng Zhang Feijin Shi Fei-Yue Wang The State Key Laboratory of Management and Control for Complex Systems Institute of Automation Chinese Academy of SciencesBeijing China Qingdao Academy of Intelligent Industries Qingdao Shandong Province China The School of Computer Engineering Weifang University Shandong P. R. China Communications Headquarters Ministry of Foreign Affairs of the People's Republic of China Beijing China Research Center of Computational Experiments and Parallel Systems The National University of Defense Technology Changsha China

Multiple-input multiple-output(MIMO) and cooperative communications have been attracted great attention for the improvements of communication capacity, power consumption, and transmission coverage. The conventional fixed relaying protocols, amplify-and-forward(AF) and decode-and-forward(DF), have their own advantages and disadvantages, i.e. AF performs better than DF for low signal-to-noise ratio(SNR) region, while the reverse is true for high SNR region. Therefore, this paper proposes an SNR-adaptive forward(SAF) relaying scheme obtaining the advantages of both AF and DF. Furthermore, the proposed SAF does not need to switch between AF and DF when SNR changes. The main idea is to adaptively derive the soft information at the cooperative relay nodes based on the information of the received signal and the SNR. Besides, based on the theoretical analysis and the simulation results, it is affirmed that the proposed SAF achieves superior performance than both AF and DF for all SNRs. Moreover, the performance gain would be improved with the increasing number of parallel cooperative relay nodes.

关键词： MIMO SNR SNR-adaptive forward multi-antenna

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A TTSVD-Enhanced Fast and Accurate Channel Estimation Method for Dual-Polarized Massive MIMO Systems

A TTSVD-Enhanced Fast and Accurate Channel Estimation Method...

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2021 IEEE International Conference on Signal Processing, communications and Computing, ICSPCC 2021

作者： Gong, Xiao Chen, Wei Chen, Xuying Chen, Jie Ai, Bo Beijing Jiaotong University State Key Laboratory of Rail Traffic Control and Safety Beijing China Key Laboratory of Railway Industry of Broadband Mobile Information Communications Beijing China Frontiers Science Center for Smart High-speed Railway System Beijing China Beijing Engineering Research Center of High-speed Railway Broadband Mobile Communications Beijing China Northwestern Polytechinical University School of Marine Science and Technology Xi'an China

ISBN: (纸本)9781665429184

This paper aims to perform fast and accurate downlink channel estimation for dual-polarized massive multiple-input multiple-output (MIMO) systems. Considering that both ends of the link are equipped with antenna arrays, the double directional channel matrix can be represented by a higherorder tensor. Based on the low-rankness of channel tensor due to the sparse scattering nature, we propose an ESPRIT-like channel estimation method enhanced by tensor train singular value decomposition (TTSVD). The proposed estimation method is characterized by (a) small estimation errors, which benefits from employing TTSVD to reduce noise in the channel tensor;and (b) fast computational speed, which exploits Vandermonde structure of signal subspace without multiple iterations. Simulated experiments in a 5G millimeter wave scenario show the superior estimation performance of the proposed method both on accuracy and speed. It is worth noting that the proposed method is at least 12 times faster than the state-of-The-Art. © 2021 IEEE.

关键词： Singular value decomposition

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Magnetically Driven Soft Continuum Microrobot for Intravascular Operations in Microscale

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Cyborg and Bionic Systems 2022年第1期2022卷 265-272页

作者： Dan Liu Xiaoming Liu Zhuo Chen Zhaofeng Zuo Xiaoqing Tang Qiang Huang Tatsuo Arai Key Laboratory of Biomimetic Robots and Sytems Ministry of EducationState Key Laboratory of Ielligent Control and Decision.of Complex SystemBeijing Advanced Innovation Center for Itelligent Robots and Systemsand School of Mechatronical EngineeringBeijing Institute of TechnologyBejing 100081China Center for Neuroscience and Biomedical Engineering The University of Electro-CommunicationsTokyo 1828585Japan

Remotely controlled soft continuum robots with active steering capability have broad prospects in medical ***,conventional continuum robots have the miniaturization *** paper presents a microscale soft continuum microrobot with steering and locomotion capabilties based on magnetic field *** magnetically driven soft continuum microrobot is made of NdFeB particles and polyd imethylsiloxane(PDMS),and it can be as small as 200 pum in ***,a hydrogel layer is covered on the surface of the microrobot,which not only overcomes the adhesion force between the microobjects and the soft tip but also reduces the friction between the microrobot and *** performance test indicates the soft continuum microrobot featured excellent control and steering *** experimental results demonstrate that the soft continuum microrobot can travel through the microfluidic channel by its own vibration and flexibly steer in a bifurcation ***,the micromanipulation of microbeads in the microfluidic channels proves that the proposed microscale soft continuum microrobot has a great potential for intravascu lar manipu lation.

关键词： friction robot overcome

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Review on recent progress in on-line monitoring technology for atmospheric pollution source emissions in China

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Journal of Environmental Sciences 2023年第1期123卷 367-386页

作者： Huanqin Wang Jitong Zhou Xue Li Qiang Ling Hongyuan Wei Lei Gao Ying He Ming Zhu Xiao Xiao Youjiang Liu Shan Li Chilai Chen Guotao Duan Zhimin Peng Peili Zhou Yufeng Duan Jianbing Wang Tongzhu Yu Yixin Yang Jiguang Wang Zhen Zhou Huaqiao Gui Yanjun Ding State Key Laboratory of Transducer Technology Institute of Intelligent MachinesHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China Institute of Mass Spectrometry and Atmospheric Environment Jinan UniversityGuangzhou 510632China Department of Automation University of Science and Technology of ChinaHefei 230027China China Automotive Technology and Research Center Tianjin 300300China Institute of Solid State Physics Chinese Academy of SciencesHefei 230031China Key Laboratory of Environmental Optics and Technology Anhui Institute of Optics and Fine MechanicsChinese Academy of SciencesHefei 230031China School of Electronic Information and Communications Huazhong University of Science and TechnologyWuhan 430074China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Power Systems Department of Energy and Power EngineeringTsinghua UniversityBeijing 100084China Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China School of Chemical and Environmental Engineering China University of Mining and Technology(Beijing)Beijing 100083China CAS Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China

Emissions from mobile sources and stationary sources contribute to atmospheric pollution in China,and its components,which include ultrafine particles(UFPs),volatile organic compounds(VOCs),and other reactive gases,such as NH3and NOx,are the most harmful to human *** has released various regulations and standards to address pollution from mobile and stationary ***,it is urgent to develop online monitoring technology for atmospheric pollution source *** study provides an overview of the main progress in mobile and stationary source monitoring technology in China and describes the comprehensive application of some typical instruments in vital areas in recent *** instruments have been applied to monitor emissions from motor vehicles,ships,airports,the chemical industry,and electric power *** only has the level of atmospheric environment monitoring technology and equipment been improving,but relevant regulations and standards have also been constantly ***,the developed instruments can provide scientific assistance for the successful implementation of *** to the potential problem areas in atmospheric pollution in China,some research hotspots and future trends of atmospheric online monitoring technology are ***,more advanced atmospheric online monitoring technology will contribute to a comprehensive understanding of atmospheric pollution and improve environmental monitoring capacity.

关键词： Atmospheric pollution Mobile sources Stationary sources On-line monitoring technology

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The design of local safety monitoring device for marine diesel engine

The design of local safety monitoring device for marine dies...

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2011 2nd International Conference on Mechanic Automation and control engineering, MACE 2011

作者： Zheng, Mingyong Tang, Xujing Yang, Jianguo School of Energy and Power Engineering Wuhan University of Technology Wuhan 430063 China Key Laboratory of Marine Power Engineering and Technology under Ministry of Communications PRC Wuhan 430063 China

ISBN: (纸本)9781424494392

Based on the basic requirements of the marine diesel engine safety monitoring and characteristics of intelligent control technology, a set of the scientific and rational technical solutions, the general principles of the structure and the feasible hardware and software of the safety monitoring system for marine diesel engine are presented in the paper. By MCU control technology and RS485 communications technology, the modular design, the accuracy display, the high degree automation, the high precision control, and the easy maintenance are achieved. The prototype of developed of the safety monitoring system for marine diesel engine is verified on the bench test, and its functional specifications meet the design technical requirements. © 2011 IEEE.

关键词： Diesel engines

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