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Assessing the corrosion protection property of coatings loaded with corrosion inhibitors using the real-time atmospheric corrosion monitoring technique

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 119-126页

作者： Xiaoxue Wang Lulu Jin Jinke Wang Rongqiao Wang Xiuchun Liu Kai Gao Jingli Sun yong yuan Lingwei Ma Hongchang Qian Dawei Zhang School of Energy and Power Engineering Beihang UniversityBeijing 100191China Beijing Institute of Space Long March Vehicle Beijing 100076China National Materials Corrosion and Protection Data Center University of Science and Technology BeijingBeijing 100083China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China Shanghai Spaceflight Precision Machinery Institute Shanghai 201600China

The atmospheric corrosion monitoring(ACM)technique has been widely employed to track the real-time corrosion behavior of metal ***,limited studies have applied ACM to the corrosion protection properties of organic *** study compared a bare epoxy coating with one containing zinc phosphate corrosion inhibitors,both applied on ACM sensors,to observe their corrosion protection properties over *** with artificial damage via scratches were exposed to immersion and alternating dry and wet environments,which allowed for monitoring galvanic corrosion currents in *** the corrosion tests,the ACM currents of the zinc phosphate/epoxy coating were considerably lower than those of the blank epoxy *** trend in ACM current variations closely matched the results obtained from regular electrochemical tests and surface *** alignment highlights the potential of the ACM technique in evaluating the corrosion protection capabilities of organic *** with the blank epoxy coating,the zinc phosphate/epoxy coating showed much-decreased ACM current values that confirmed the effective inhibition of zinc phosphate against steel corrosion beneath the damaged coating.

关键词： atmospheric corrosion monitoring technology corrosion inhibitor coating carbon steel corrosion protection

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Data Driven CAN Node Reliability Assessment for Manufacturing System

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Chinese Journal of Mechanical Engineering 2017年第1期30卷 190-199页

作者： ZHANG Leiming yuan yong LEI yong State Key Laboratory of Fluid Power & Mechatronic Systems Zhejiang University State Key Laboratory of Automotive Safety and Energy Tsinghua University

The reliability of the Controller Area Network（CAN） is critical to the performance and safety of the system. However, direct bus-off time assessment tools are lacking in practice due to inaccessibility of the node information and the complexity of the node interactions upon errors. In order to measure the mean time to bus-off（MTTB） of all the nodes, a novel data driven node bus-off time assessment method for CAN network is proposed by directly using network error information. First, the corresponding network error event sequence for each node is constructed using multiple-layer network error information. Then, the generalized zero inflated Poisson process（GZIP） model is established for each node based on the error event sequence. Finally, the stochastic model is constructed to predict the MTTB of the node. The accelerated case studies with different error injection rates are conducted on a laboratory network to demonstrate the proposed method, where the network errors are generated by a computer controlled error injection system. Experiment results show that the MTTB of nodes predicted by the proposed method agree well with observations in the case studies. The proposed data driven node time to bus-off assessment method for CAN networks can successfully predict the MTTB of nodes by directly using network error event data.

关键词： bus-off monitoring Controller Area Network industrial automation

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Fault Location Identification for Localized Intermittent Connection Problems on CAN Networks

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Chinese Journal of Mechanical Engineering 2014年第5期27卷 1038-1046页

作者： LEI yong yuan yong SUN Yichao State Key Laboratory of Fluid Power Transmission and Control Zhejiang University State Key Laboratory of Automotive Safety and Energy Tsinghua University

The intermittent connection（IC）of the field-bus in networked manufacturing systems is a common but hard troubleshooting network problem,which may result in system level failures or safety ***,there is no online IC location identification method available to detect and locate the position of the *** tackle this problem,a novel model based online fault location identification method for localized IC problem is ***,the error event patterns are identified and classified according to different node sources in each error *** generalized zero inflated Poisson process（GZIP）model for each node is established by using time stamped error event ***,the location of the IC fault is determined by testing whether the parameters of the fitted stochastic model is statistically significant or not using the confident intervals of the estimated *** illustrate the proposed method,case studies are conducted on a 3-node controller area network（CAN）test-bed,in which IC induced faults are imposed on a network drop cable using computer controlled on-off *** experimental results show the parameters of the GZIP model for the problematic node are statistically significant（larger than 0）,and the patterns of the confident intervals of the estimated parameters are directly linked to the problematic node,which agrees with the experimental *** proposed online IC location identification method can successfully identify the location of the drop cable on which IC faults occurs on the CAN network.

关键词： CAN network fault location identification GZIP model intermittent connection

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Surface/interface engineering of high-efficiency noble metal-free electrocatalysts for energy-related electrochemical reactions

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Journal of Energy Chemistry 2021年第3期30卷 89-104页

作者： Hui Zhao Zhong-yong yuan School of Materials Science and Engineering Liaocheng UniversityLiaocheng 252000ShandongChina Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) School of Materials Science and EngineeringNankai UniversityTianjin 3000350China

To date,much efforts have been devoted to the high-efficiency noble metal-free electrocatalysts for hydrogen-and oxygen-involving energy conversion reactions,due to their abundance,low cost and ***/interface engineering is found to be effective in achieving novel physicochemical properties and synergistic effects in nanomaterials for *** various engineering strategies,heteroatom-doping has been regarded as a most promising method to improve the electrocatalytic performance via the regulation of electronic structure of catalysts,and numerous works were reported on the synthesis method and mechanism investigation of heteroatom-doping electrocatalysts,though the heteroatom-doping can only provide limited active *** of other defects such as vacancies and edge sites and construction of heterostructure have shown to open up a potential avenue for the development of noble metal-free *** addition,surface functionalization can attach various molecules onto the surface of materials to easily modify their physical or chemical properties,being as a promising complement or substitute for offering materials with catalytic *** paper gives the insights into the diverse strategies of surface/interface engineering of the highefficiency noble metal-free electrocatalysts for energy-related electrochemical *** significant advances are *** unique advantages and mechanisms for specific applications are *** current challenges and outlook of this growing field are also discussed.

关键词： Noble metal-free electrocatalysts Electrocatalysis Surface/interface engineering Metal-air battery Overall water splitting

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Mode-based equivalent multi-degree-of-freedom system for one-dimensional viscoelastic response analysis of layered soil deposit

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Earthquake Engineering and Engineering Vibration 2018年第1期17卷 103-124页

作者： Li Chong yuan Juyun Yu Haitao yuan yong Department of Geotechnical Engineering Tongji University Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Tongji University State Key Laboratory for Disaster Reduction in Civil Engineering Tongji University

Discrete models such as the lumped parameter model and the finite element model are widely used in the solution of soil amplification of earthquakes. However, neither of the models will accurately estimate the natural frequencies of soil deposit, nor simulate a damping of frequency independence. This research develops a new discrete model for onedimensional viscoelastic response analysis of layered soil deposit based on the mode equivalence method. The new discrete model is a one-dimensional equivalent multi-degree-of-freedom（MDOF） system characterized by a series of concentrated masses, springs and dashpots with a special configuration. The dynamic response of the equivalent MDOF system is analytically derived and the physical parameters are formulated in terms of modal properties. The equivalent MDOF system is verified through a comparison of amplification functions with the available theoretical solutions. The appropriate number of degrees of freedom（DOFs） in the equivalent MDOF system is estimated. A comparative study of the equivalent MDOF system with the existing discrete models is performed. It is shown that the proposed equivalent MDOF system can exactly present the natural frequencies and the hysteretic damping of soil deposits and provide more accurate results with fewer DOFs.

关键词： ground response analysis MDOF system mode equivalence modal properties layered soil viscoelastic amplification

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Preface to special issue on“Advanced Materials and Catalysis”

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Frontiers of Chemical Science and Engineering 2021年第6期15卷 1357-1359页

作者： Zhong-yong yuan School of Materials Science and Engineering Nankai UniversityTianjin300350China

Advanced materials and catalysis have attracted increasing attention in recent years,particularly due to the rapid development and great progress in energy and environmental *** is well acknowledged that the key to mitigating energy crisis,ameliorating global environment and improving the life quality of people is to explore green and renewable energy resources,in which catalysis plays a significant *** the past years,besides the conventional thermocatalysis,both electrocatalysis and photocatalysis have been developing *** numerous advanced materials have been designed and applied in the catalysis fields for energy storage and conversion,such as hydrogen production,fuel batteries and secondary batteries,oil refining,pollutant degradation,ammonia synthesis,greenhouse gases conversion,and so *** emergence of new advanced materials provides new insights and opportunities for the development of ***,Frontiers of Chemical Science and Engineering,one of the transactions of Chinese Academy of Engineering,organized this special issue aiming to showcase some of the prominent achievements and progress made in the relevant research *** special issue is also dedicated to Professor Hexuan Li(Fig.1)on the occasion of his 95th birthday,recognizing his distinguished contributions to many aspects in the field of advanced materials and catalysis.

关键词： catalysis gases besides

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State-of-the-Art Technology in the Construction of Sea-Crossing Fixed Links with a Bridge, Island, and Tunnel Combination

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Engineering 2019年第1期5卷 15-21页

作者： Yaojun Ge yong yuan State Key Laboratory of Disaster Reduction in Civil Engineering Tongji University Shanghai 200092 China

In general, two kinds of structures are used to provide a way across a river, canal, sea, or other obstacle: bridge structures that pass over the obstacle, and tunnel structures that pass below the obstacle. Although the construction of both bridges and tunnels can be traced back over thousands of years, bridge–tunnel combinations that use an island as a sea-crossing fixed link (SCFL) have only been built over the past 82 years. The first such combination was probably the 6.4 km long San Francisco–Oakland Bay Bridge in the United States, which was completed in 1936. The most recently constructed SCFL combining a bridge, tunnel, and island is the Hong Kong–Zhuhai–Macao (HZM) Bridge, which opened for traffic on October 24, 2018 with the longest SCFL combination in the world, at a total length of 29.6 km.

关键词： kinds of structures provide a way across combinations

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An Electrochemical Synthesis Approach for Tetrasubstituted Olefins

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Chinese Journal of Chemistry 2019年第7期37卷 744-745页

作者： Fangling Lu yong yuan National Research Center for Carbohydrate Synthesis Jiangxi Province's Key Laboratory of Chemical Biology Jiangxi Normal UniversityNanchang Jiangxi 330022 China College of Chemistry and Chemical Engineering Jiangxi Normal University Nanchang Jiangxi 330022 China College of Chemistry and Molecular Sciences Institute for Advanced Studies(IAS) Wuhan University Wuhan Hubei 430072 China

Since tetrasubstituted olefins serve as the key structure motifs in a large number of biologically active compounds,methods for synthesis of tetrasubstituted olefins are highly *** various synthetic methodologies,the most known strategies are the functionalization of olefins,alkynes,and *** example,Zhang,Gosselin and co-workers prepared a series of tetrasubstituted olefins via Suzuki-Miyaura coupling (Scheme 1a).[1] Morandi and co-workers reported a palladium-catalyzed intermolecular aryliodination of internal alkynes (Scheme 1b).[2] Ma and co-workers prepared a series of tetrasubstituted olefins by using readily available organozinc reagents and 2,3-allenals (Scheme 1c).[3] Despite extensive advances,the reported methods often require pre-prepared starting materials,inevitably leading to some ***,under the supervision of *** and Lei,we and Yang et *** an unprecedented electrochemical oxidative Csp3-H/S-H cross-coupling reaction between thiophenols and acetonitrile (Scheme 1d),yielding a series of tetrasubstituted olefins under exogenous-oxidant-free conditions.

关键词： Tetrasubstituted Olefins Electrochemical Synthesis

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Some tests and improvements to the VFISV: Very Fast Inversion of the Stokes Vector for the Helioseismic and Magnetic Imager

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Research in Astronomy and Astrophysics 2014年第11期14卷 1469-1480页

作者： Fei Teng yuan-yong Deng Key Laboratory of Solar Activity National Astronomical ObservatoriesChinese Academy of Sciences

Some experimental tests and improvements to the Very Fast Inversion of the Stokes Vector program, which is designed for the inversion calculation used by the Helioseismic and Magnetic Imager instrument on the Solar Dynamics Observatory, are given. On one hand, the interpolation for calculating the Voigt function is not smooth, which may occasionally cause the iteration process to converge to different minima although they are very close to initial values. This problem can be solved by a smoother interpolation. On the other hand, in order to improve the performance of this program, we have tried to abandon the randomly-jump-out strategy and set the initial value properly to avoid non-global minima. The resulting method costs only 1//4 of the computational time, and will be very competitive when the users are only interested in the vectorial magnetic fields and the velocities along the line of sight.

关键词： Sun magnetic fields -- methods numerical -- techniques polarimetric

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A fast Stokes inversion technique based on quadratic regression

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Research in Astronomy and Astrophysics 2016年第5期16卷 7-16页

作者： Fei Teng yuan-yong Deng Key Laboratory of Solar Activity National Astronomical Observatories Chinese Academy of Sciences

Stokes inversion calculation is a key process in resolving polarization information on radiation from the Sun and obtaining the associated vector magnetic fields. Even in the cases of simple local thermo- dynamic equilibrium （LTE） and where the Milne-Eddington approximation is valid, the inversion problem may not be easy to solve. The initial values for the iterations are important in handling the case with mul- tiple minima. In this paper, we develop a fast inversion technique without iterations. The time taken for computation is only 1/100 the time that the iterative algorithm takes. In addition, it can provide available initial values even in cases with lower spectral resolutions. This strategy is useful for a filter-type Stokes spectrograph, such as SDO/HMI and the developed two-dimensional real-time spectrograph （2DS）.

关键词： Sun: magnetic fields -- methods: statistical -- methods: data analysis -- techniques: polari-metric

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