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Pyrolysis Empirical Modeling of Polyester Glass Fiber Reinforced Plastics Using Sestak-Berggren Model Method

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Journal of Thermal Science 2024年第2期33卷 725-738页

作者： NAN Wei JI Wenhui YUAN Yanping YUAN Zhongyuan SUN Yong School of Mechanical engineering Southwest Jiaotong UniversityChengdu610031China CRRC Changchun Railway Vehicles co. LtdChangchun130062China

Polyester Glass Fiber Reinforced Plastic(Polyester GFRP),a thermosetting plastic co.prised of glass fiber and polyester polymer co.pounds,is extensively utilized in high-speed *** its pyrolysis mechanism is crucial as it significantly influences the co.bustion characteristics and fire safety ***,kinetic research on polyester GFRP primarily focuses on employing the co.ts-Redfern method to derive a theoretical kinetic ***,the pyrolysis process of polyester GFRP is co.plex and the aforementioned theoretical model fails to accurately describe the pyrolysis ***,this study seeks to utilize the Sestak and Berggren(SB) model as a methodological approach to reveal the co.plex reaction mechanism during the pyrolysis *** on thermogravimetric analysis,the entire pyrolysis process of polyester GFRP is divided into two primary ***,model-free methods are employed to ascertain the activation energy and pre-exponential *** results show that the fitted empirical models of the two main pyrolysis stages are f(α)=(1-α)^(1.47)[-ln(1-α)]^(1.50) and f(α)=(1-α)^(1.77)[-ln(1-α)]^(1.72),*** predicted results are in good agreement with experimental data under different heating rates,which indicates that the empirical model can sufficiently describe the pyrolysis process of polyester GFRP.

关键词： polyester GFRP model-fitting methods empirical models pyrolysis

Enhancing source domain availability through data and feature transfer learning for building power load forecasting

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Building Simulation 2024年第4期17卷 625-638页

作者： Fanyue Qian Yingjun Ruan Huiming Lu Hua Meng Tingting Xu co.lege of Mechanical and Energy engineering Tongji UniversityShanghai200092China United Automotive Electronic Systems co. LtdShanghai201206China

During the initial phases of operation following the co.struction or renovation of existing buildings,the availability of historical power usage data is limited,which leads to lower accuracy in load forecasting and hinders normal ***,by transferring load data from similar buildings,it is possible to enhance forecasting ***,indiscriminately expanding all source domain data to the target domain is highly likely to result in negative transfer *** study explores the feasibility of utilizing similar buildings(source domains)in transfer learning by implementing and co.paring two distinct forms of multi-source transfer ***,this study focuses on the Higashita area in Kitakyushu City,Japan,as the research *** buildings that exhibit the highest similarity to the target buildings within this area were selected for ***,the two-stage TrAdaBoost.R^(2) algorithm is used for multi-source transfer learning,and its transfer effect is ***,the application effects of instance-based(IBMTL)and feature-based(FBMTL)multi-source transfer learning are co.pared,which explained the effect of the source domain data on the forecasting accuracy in different transfer *** results show that co.bining the two-stage TrAdaBoost.R^(2) algorithm with multi-source data can reduce the CV-RMSE by 7.23%co.pared to a single-source domain,and the accuracy improvement is *** the same time,multi-source transfer learning,which is based on instance,can better supplement the integrity of the target domain data and has a higher forecasting ***,IBMTL tends to retain effective data associations and FBMTL shows higher forecasting *** findings of this study,which include the verification of real-life algorithm application and source domain availability,can serve as a theoretical reference for implementing transfer learning in load forecasting.

关键词： building power load multi-source transfer learning two-stage TrAdaBoost.R2 source domain availability

Analysis of Detection and Monitoring Technology in the co.struction and Maintenance of Large Bridges

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Journal of Architectural Research and Development 2024年第3期8卷 134-139页

作者： Shengzhong Xiang Qin Su Shili Zhang China Merchants Chongqing highway engineering Testing Center co. LTD.Chongqing 400060China

Currently,there is significant attention placed on the co.struction,management,and maintenance of large service *** the realm of bridge maintenance management,the utilization of detection and monitoring technology is *** employing these technologies,we can effectively identify any structural defects within the bridge,promptly unco.er unknown risks,proactively establish maintenance strategies,and prevent the rapid deterioration of bridge *** article aims to explore the advantages of applying bridge monitoring and testing technology and to discuss various methods for implementing detection and monitoring technology throughout the co.struction,management,and maintenance phases of large ***,this will co.tribute to ensuring the safe operation of large bridges.

关键词： Large bridges co.struction Maintenance Monitoring technology Detection technology

co.struction Technology of Pile Foundation for Subway Tunnel Crossing Bridge

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Journal of World Architecture 2024年第2期8卷 37-42页

作者： Ruiquan Liu China Merchants Chongqing highway engineering Testing Center co. LTD.Chongqing 400060China

Urban infrastructure has beco.e more co.plex with the rapid development of urban transportation *** urban environments with limited space,co.struction of facilities like subways and bridges may mutually influence each other,especially when subway co.struction requires passing under *** such cases,pile foundation replacement technology is often ***,this technology is highly specialized,with a lengthy and risky co.struction period,and high *** must be proficient in key technical aspects to ensure co.struction *** article discusses the technical principle,co.struction process,and co.e technology of pile foundation replacement,along with the application of this technology in subway tunnel crossing bridge projects,supported by engineering examples for reference.

关键词： Subway tunnel Bridge pile foundation Replacement co.struction

Laboratory evaluation of high-friction thin overlays for pavement preservation

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Frontiers of Structural and Civil engineering 2024年第6期18卷 936-948页

作者： Ouming XU Rentao XU Lintong JIN School of highway Chang’an UniversityXi’an 710064China School of Materials Science and engineering Chang’an UniversityXi’an 710061China

Traditional asphalt co.crete(AC)and stone matrix asphalt(SMA),which are used as thin asphalt overlays,are co.mon maintenance strategies to enhancing ride quality,skid resistance,and ***,several studies have used a novel asphalt mixture known as a high-friction thin overlay(HFTO)to improve surface ***,it remains uncertain whether the laboratory properties of HFTO differ significantly from those of co.ventional *** study aims to evaluate the laboratory properties of HFTO mixtures and co.pare them with those of AC and *** mixtures with nominal maximum size of 9.5 mm were produced in the laboratory,and performance tests were co.ducted,including wheel tracking test,low temperature flexural creep test,moisture susceptibility test,Cantabro Abrasion Test,Marshall Test,sand patch test,British pendulum test,and indoor tire-rollingdown *** results showed that the HFTO exhibited a lower tire/pavement noise than the AC and ***,HFTO had superior high-temperature stability,larger macro texture,and higher skid resistance in co.parison to those of AC,but lower than those of ***,HFTO mixtures may be co.sidered a suitable replacement for traditional AC mixtures in regions where skid resistance and noise reduction are co.cerns.

关键词： road engineering pavement maintenance high friction thin overlay performance skid resistance tire/pavement noise

Analysis of the Application of Static Load Test in Bridge Bearing Capacity Testing

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Journal of Architectural Research and Development 2024年第3期8卷 36-41页

作者： Wei Fu Bo Liu China Merchants Chongqing highway engineering Testing Center co. LTD.Chongqing 400060China

This article uses real engineering projects as examples to analyze how static load test technology is applied in testing the bridge-bearing *** analysis co.ers aspects such as testing section layout,test load and efficiency co.fficient,loading plan,evaluation optimization,test result modification,and result *** aim is to support the accurate detection and evaluation of bridge-bearing capacity.

关键词： Bridge engineering Bearing capacity Static load test Loading plan Test evaluation

Application Strategy of Digital co.prehensive Management and Maintenance System for Bridges

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Journal of World Architecture 2024年第2期8卷 154-159页

作者： Shengzhong Xiang Linlong Wang Manman Feng Jian Cao China Merchants Chongqing highway engineering Testing Center co. LTD.Chongqing 400060China

Effective application of digital integrated management and maintenance systems is essential for successful operation and maintenance management of bridge *** article analyzes the application strategy of such *** provides an overview of co.prehensive digital management and maintenance of bridges,an analysis of the basic co.ponents of the integrated management and maintenance system,and its application *** study aims to offer guidance for the application of the system and to improve the quality of modern bridge engineering management and maintenance work.

关键词： Bridge engineering Digital integrated management and maintenance system co.ponent modules

Technical Analysis of Safety Monitoring and Evaluation of Existing Bridge Structures

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Journal of World Architecture 2024年第2期8卷 17-24页

作者： Jiang Feng Qing Yang China Merchants Chongqing highway engineering Testing Center co. LTD.Chongqing 400060China

Bridge structure safety monitoring and assessment has been a great co.cern for the government and the public,and bridge structure safety monitoring and assessment technology has also developed rapidly over the *** goal is to equip relevant organizations and professionals with a deep understanding of the principles and practical applications of these *** doing so,it seeks to facilitate the effective implementation of safety monitoring and assessment practices in bridge ***,the aim is to foster the co.structive development of road and bridge co.struction and operational management at a broader level.

关键词： Bridge structure Safety monitoring Defect diagnosis Theoretical modeling method

Service Function Chain Deployment Algorithm Based on Multi-Agent Deep Reinforcement Learning

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co.puters, Materials & co.tinua 2024年第9期80卷 4875-4893页

作者： Wanwei Huang Qiancheng Zhang Tao Liu YaoliXu Dalei Zhang co.lege of Software engineering Zhengzhou University of Light IndustryZhengzhou450007China Henan Jiuyu Tenglong Information engineering co. Ltd.Zhengzhou450052China Henan Xin’an co.munication Technology co. Ltd.Zhengzhou450007China

Aiming at the rapid growth of network services,which leads to the problems of long service request processing time and high deployment co.t in the deployment of network function virtualization service function chain(SFC)under 5G networks,this paper proposes a multi-agent deep deterministic policy gradient optimization algorithm for SFC deployment(MADDPG-SD).Initially,an optimization model is devised to enhance the request acceptance rate,minimizing the latency and deploying the co.t SFC is co.structed for the network resource-co.strained ***,we model the dynamic problem as a Markov decision process(MDP),facilitating adaptation to the evolving states of network ***,by allocating SFCs to different agents and adopting a co.laborative deployment strategy,each agent aims to maximize the request acceptance rate or minimize latency and *** agents learn strategies from historical data of virtual network functions in SFCs to guide server node selection,and achieve approximately optimal SFC deployment strategies through a co.perative framework of centralized training and distributed *** simulation results indicate that the proposed method,while simultaneously meeting performance requirements and resource capacity co.straints,has effectively increased the acceptance rate of requests co.pared to the co.parative algorithms,reducing the end-to-end latency by 4.942%and the deployment co.t by 8.045%.

关键词： Network function virtualization service function chain Markov decision process multi-agent reinforcement learning