检索结果-南通市图书馆

Underground Space 2018年第2期3卷 166-179页

作者： yuequan bao Dongyang Feng Nan Ma Hehua Zhu Timon Rabczuk College of Ciuil Engineering Tongji UniversityShanghai 200092China Pipeline Management Branch Company Shanghai Municipal Sewerage Co.LtdShanghai 201103China Institute of Structural Mechanics Bauhaus University of WeimarWeimar 99423Germany

An experimental and numerical investigation into the structural performance of reinforced concrete box sewers with typical corrosion-related extreme defects localized at the ceiling was ***,during the large-scale laboratory test,some key struc-tural responses were captured and evaluated,including the crack width development process(via digital image correlation measurement),ceiling deﬂection,and material strains of both complete and typical defective *** failure modes and load-carrying mechanism throughout the specimen loading phases were ***,the specimen failure process was simulated using a damage-basedﬁnite element method,and a related parameter sensitivity analysis was *** results indicate that the defective ceiling cracked at mid-span under a low load value,but the bending capacity loss can be substituted by two shoulders and carry three toﬁve times more load before completely *** simulation matched the lab test qualitatively,and with the suggested set strategy of material parameters,the load-deﬂection feature curve could provide a practical prediction of the ultimate bearing capacity of the defec-tive sewers,with a 10–15%error on the safe side.

关键词： Defective reinforced concrete box sewer Corrosion Structural performance Large-scale model test Digital image correlation measurement Failure simulation

The State of the Art of Data Science and Engineering in Structural Health Monitoring

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Engineering 2019年第2期5卷 234-242页

作者： yuequan bao Zhicheng Chen Shiyin Wei Yang Xu Zhiyi Tang Hui Li School of Civil Engineering Harbin Institute of Technology Harbin 150090 China

Structural health monitoring (SHM) is a multi-discipline field that involves the automatic sensing of structural loads and response by means of a large number of sensors and instruments, followed by a diagnosis of the structural health based on the collected data. Because an SHM system implemented into a structure automatically senses, evaluates, and warns about structural conditions in real time, massive data are a significant feature of SHM. The techniques related to massive data are referred to as data science and engineering, and include acquisition techniques, transition techniques, management techniques, and processing and mining algorithms for massive data. This paper provides a brief review of the state of the art of data science and engineering in SHM as investigated by these authors, and covers the compressive sampling-based data-acquisition algorithm, the anomaly data diagnosis approach using a deep learning algorithm, crack identification approaches using computer vision techniques, and condition assessment approaches for bridges using machine learning algorithms. Future trends are discussed in the conclusion.

关键词： Structural health monitoring Monitoring data Compressive sampling Machine learning Deep learning

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人工智能时代的土木工程

土木工程学报 2019年第5期52卷 1-11页

作者：鲍跃全李惠哈尔滨工业大学黑龙江哈尔滨150001

人工智能为土木工程学科的发展带来新的机遇,人工智能技术深度融合土木工程基础设施规划、设计、建造和养维护的全生命周期,深刻变革土木工程科学、技术与工程的发展。人工智能的深度学习和机器学习算法、计算机视觉、无人机、3D打印、... 详细信息

人工智能为土木工程学科的发展带来新的机遇,人工智能技术深度融合土木工程基础设施规划、设计、建造和养维护的全生命周期,深刻变革土木工程科学、技术与工程的发展。人工智能的深度学习和机器学习算法、计算机视觉、无人机、3D打印、BIM、虚拟现实和增强现实等应用于土木工程,将形成无人化、全自动、智慧化、实景体验的城市和区域规划、以及土木工程设计、建造、养维护和灾害管控的新技术。该文从基于人工智能的城市智能规划、结构智能设计、智能建造、智能养维护、智能防灾等方面阐述人工智能在土木工程领域的相关研究和应用。

关键词：人工智能深度学习计算机视觉无人机 3D打印虚拟现实

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结构状态识别与评估的机器学习方法研究进展

力学进展 2023年第4期53卷 774-792页

作者：黄永鲍跃全李惠哈尔滨工业大学土木工程学院哈尔滨150090

结构健康监测通过在大型工程结构上安装多类型传感器,感知、采集、传输和处理多元数据,已经成为保障重大工程结构安全的重要手段.随着结构健康监测系统的广泛应用,产生了海量的监测数据,如何通过监测数据识别和评估结构状态与安全是核... 详细信息

结构健康监测通过在大型工程结构上安装多类型传感器,感知、采集、传输和处理多元数据,已经成为保障重大工程结构安全的重要手段.随着结构健康监测系统的广泛应用,产生了海量的监测数据,如何通过监测数据识别和评估结构状态与安全是核心科学问题之一.由于土木工程结构的复杂性,状态识别与评估的核心难点是高维问题优化与求解,机器学习在高维问题求解方面具有很强的能力,为该问题的解决提供了新的思路.本文重点阐述机器学习在结构模态识别、损伤识别及可靠性评估等方面的研究进展,并讨论未来在该研究方向的发展趋势.

关键词：结构损伤识别模态识别安全评定机器学习结构健康监测

Protein acetylation sites with complex-valued polynomial model

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Frontiers of Computer Science 2024年第3期18卷 217-226页

作者： Wenzheng bao Bin YANG School of Information Engineering Xuzhou University of TechnologyXuzhou 221018China School of Information Science and Engineering Zaozhuang UniversityZaozhuang 277160China

Protein acetylation refers to a process of adding acetyl groups(CH3CO-)to lysine residues on protein *** one of the most commonly used protein post-translational modifications,lysine acetylation plays an important role in different *** our study,we developed a humanspecific method which uses a cascade classifier of complexvalued polynomial model(CVPM),combined with sequence and structural feature descriptors to solve the problem of imbalance between positive and negative *** gene expression programming and differential evolution are utilized to search the optimal CVPM *** also made a systematic and comprehensive analysis of the acetylation data and the prediction *** performances of our proposed method are 79.15%in Sp,78.17%in Sn,78.66%in ACC 78.76%in F1,and 0.5733 in MCC,which performs better than other state-of-the-art methods.

关键词： protein acetylation complex-valued polynomial model machine learning

New steelmaking process based on clean deoxidation technology

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International Journal of Minerals,Metallurgy and Materials 2024年第6期31卷 1249-1262页

作者： Zhongliang Wang Yanping bao State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

After the converter steelmaking process,a considerable number of ferroalloys are needed to remove dissolved oxygen from the molten steel,but it also forms a lot of oxide inclusions that cannot be completely *** the same time,it increases the carbon emis-sions in the steel production *** years of research,our team have developed a series of clean deoxidation technologies,includ-ing carbon deoxidation,hydrogen deoxidation,and waste plastic deoxidation of molten steel to address the aforementioned *** this study,thermodynamic calculations and laboratory experiments were employed to verify that carbon and hydrogen can reduce the total oxygen content in the molten steel melt to below 5×10^(-6) and 10×10^(-6),*** analysis of the deoxidation mechanisms and ef-fects of polyethylene and polypropylene was also *** addition,the applications of carbon deoxidation technology in different steels with the hot-state experiment and industrial production were discussed *** carbon deoxidation experimental results of different steels were as follows:(1)the oxygen content of bearing steel was effectively controlled at 6.3×10^(-6) and the inclusion number density was lowered by 74.73%compared to aluminum deoxidized bearing steel;(2)the oxygen content in gear steel was reduced to 7.7×10^(-6) and a 54.49%reduction of inclusion number density was achieved with almost no inclusions larger than 5μm from the average level of industry gear steels;(3)a total oxygen content of M2 high-speed steel was as low as 3.7×10^(-6).In industrial production practice,car-bon deoxidation technique was applied in the final deoxidation stage for non-aluminum deoxidized bearing steel,and it yielded excellent results that the oxygen content was reduced to below 8×10^(-6) and the oxide inclusions in the steel mainly consist of silicates,along with small amounts of spinel and calcium aluminate.

关键词： clean deoxidation carbon deoxidation hydrogen deoxidation waste plastics deoxidation

Improved mass relations of mirror nuclei

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Nuclear Science and Techniques 2024年第9期35卷 178-185页

作者： Cheng Xu Man bao Department of Physics University of Shanghai for Science and TechnologyShanghai 200093China

In this study,we revisit the previous mass relations of mirror nuclei by considering 1/N-and 1/Z-dependent terms and the shell effect across a *** root-mean-squared deviation is 66 keV for 116 nuclei with neutron number N≥10,as com-pared with experimental data compiled in the AME2020 *** predicted mass excesses of 173 proton-rich nuclei,including 98 unknown nuclei,are tabulated in the Supplemental Material herein with competitive accuracy.

关键词： Nuclear mass Mirror nuclei Proton-rich nuclei

Development and prospects of molten steel deoxidation in steelmaking process

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International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 18-32页

作者： Zhongliang Wang Yanping bao State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

In the long traditional process of steelmaking,excess oxygen is blown into the converter,and alloying elements are used for *** inevitably results in excessive deoxidation of products remaining within the steel liquid,affecting the cleanliness of the *** the increasing requirements for steel performance,reducing the oxygen content in the steel liquid and ensuring its high cleanliness is *** more than a hundred years of development,the total oxygen content in steel has been reduced from approximately 100×10^(-6)to approximately 10×10^(-6),and it can be controlled below 5×10^(-6)in some steel grades.A relatively stable and mature deoxidation technology has been formed,but further reducing the oxygen content in steel is no longer significant for improving steel *** research team developed a deoxidation technology for bearing steel by optimizing the entire conventional *** technology combines silicon–manganese predeoxidation,ladle furnace diffusion deoxidation,and vacuum final *** successfully conducted industrial experiments and produced interstitial-free steel with natural decarbonization ***-aluminum deoxidation was found to control the oxygen content in bearing steel to between 4×10^(-6) and 8×10^(-6),altering the type of inclusions,eliminating large particle Ds-type inclusions,improving the flowability of the steel liquid,and deriving a higher fatigue *** natural decarbonization predeoxidation of interstitial-free steel reduced aluminum consumption and production costs and significantly improved the quality of cast billets.

关键词： steel deoxidation deoxidizer metallurgical equipment bearing steel IF steel

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大口径排水箱涵混凝土结构腐蚀实例研究

给水排水 2019年第9期45卷 121-123页

作者：谢永健鲍月全李宁上海勘察设计研究院(集团)有限公司上海200093 上海城投水务(集团)有限公司上海200022

大口径排水箱涵混凝土结构的腐蚀是排水箱涵耐久性研究的重要内容。通过上海市的工程实例,开展排水箱涵的腐蚀现状调查,对材料强度、碳化深度、钢筋锈蚀半电池电位进行检测分析,探讨大口径排水箱涵混凝土结构腐蚀机理。

关键词：大口径排水箱涵混凝土结构腐蚀

Quantitative estimation of global mean precipitation throughout the Phanerozoic era

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Science China Earth Sciences 2024年第5期67卷 1616-1624页

作者： Xiujuan bao Yongyun HU Laboratory for Climate and Ocean-Atmospheric Studies Department of Atmospheric and Oceanic SciencesSchool of PhysicsPeking UniversityBeijing 100871China

Quantitatively estimating the global mean precipitation(GMP)throughout Earth's history is crucial for enhancing our understanding of long-term climate evolution and the hydrological ***,currently there is no established methodology for estimating global mean ***,we present the first study that estimates GMP in the Phanerozoic *** relationship between GMP and global mean surface temperature(GMST)is investigated by analyzing data from 23 models in the Coupled Model Intercomparison Project phase 6(CMIP6).The result reveals consistent and significant impact of temperature on precipitation,with a sensitivity range of 2–3%K^(-1).Additionally,we propose a method for accessing latitudinal variations in precipitation caused by land area distributions and paleo-Koppen climatic *** climatic belts are determined based on geological indicators such as coals,evaporites,and glacial *** GMP is thus quantitatively estimated by combining variations in GMST,land area distributions,and paleo-koppen climatic belts,spanning from 540 Ma to the present *** quantitative GMP curve demonstrates fluctuations in GMP about 500 mm yr^(-1),with values ranging from 948 to1442 mm yr-1over the Phanerozoic *** curve aligns closely with findings derived from numerical *** presented paleoprecipitation variations facilitate a more comprehensive understanding of the interconnected geological and paleoclimatic developments.

关键词： Paleoprecipitation Paleoclimate K?ppen climatic belts Global mean precipitation Hydrological cycle