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China Foundry 2021年第3期18卷 163-169页

作者： Fu-xing Yin Ming Su Fa Ji Qing-chao Tian ya-guan bai Jian-hang Feng Zhi-xia Xiao School of Materials Science and Engineering Hebei University of TechnologyTianjin 300130China Tianjin Key Laboratory of Layered Composite Materials Tianjin 300130China State Key Laboratory of Advanced Special Steel Shanghai Key Laboratory of Advanced FerrometallurgySchool of Materials Science and EngineeringShanghai UniversityShanghai 200444China Tianjin Heavy Industries Research and Development Co. Ltd.Tianjin 300457China

Large-size primary MC carbides can significantly reduce the performance of M2 high-speed *** better control the morphology and size of primary MC carbides,the effect of melting rate on microsegregation and primary MC carbides of M2 steel during electroslag remelting was *** the melting rate is decreased from 2 kg·min^(-1) to 0.8 kg·min^(-1),the columnar dendrites are gradually coarsened,and the extent of segregation of Mo and V is alleviated,while the segregation of Cr becomes *** 2 kg·min^(-1),the number of primary MC carbides per unit area with the sizes in the range of 2 μm to 6 μm accounts for about 75% of all MC carbides,while the carbides are mainly concentrated on the size larger than 8 μm at 0.8 kg·min^(-1).Thermodynamic calculations based on the Clyne-Kurz (simplified to C-K) model shows that MC carbide can be precipitated in the final solidification stage and a smaller secondary dendrite arm spacing caused by higher melting rate (2 kg·min^(-1) in this experiment) facilitates the refinement of primary MC carbides.

关键词： high-speed steel MC carbide melting rate electroslag remelting microsegregation

Recent progress and prospect of carbon-free single-site catalysts for the hydrogen and oxygen evolution reactions

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Nano Research 2022年第2期15卷 818-837页

作者： Jingqi guan Xue bai Tianmi Tang Institute of Physical Chemistry College of ChemistryJilin University2519 Jiefang RoadChangchun 130021China

The key challenge for scalable production of hydrogen from water lies in the rational design and preparation of high-performance and earth-abundant electrocatalysts to replace precious metal Pt and IrO_(2) for hydrogen evolution reaction(HER)and oxygen evolution reaction(OER).Although atomic M-N-C materials have been extensively studied in heterogeneous catalysis field,the insufficient antioxidant capacity of carbonous substrates hinders their practical application in *** highly active and stable OER electrocatalysts is the key for electrochemical water *** review presents feasible design strategies for fabricating carbon-free single-site catalysts and their applications in HER/OER and overall water *** constitutive relationships between structure,composition,and catalytic performance for HER and OER are detailly discussed,providing ponderable insights into rationally constructing high-performance HER and OER *** perspectives on the challenges and future research orientations in single-site catalysts for electrochemical water splitting are suggested.

关键词： single-atom catalyst single-site catalyst hydrogen evolution reaction oxygen evolution reaction water splitting

Reliability analysis on civil engineering project based on integrated adaptive simulation annealing and gray correlation method

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Frontiers of Structural and Civil Engineering 2016年第4期10卷 462-471页

作者： Xiao-ping bai ya-nan LIU System Engineering Research Institute School of Management Xi 'an University of Architecture & Technology Xi 'an 710055 China

Dynamic reliability is a very important issue in reliability research. The dynamic reliability analysis for the project is still in search of domestic and international research in the exploration stage. By now, dynamic reliability research mainly concentrates on the reliability assessment; the methods mainly include dynamic fault tree, extension of event sequence diagram and Monte Carlo simulation, and et al. The paper aims to research the dynamic reliability optimization. On the basis of analysis of the four quality influence factors in the construction engineering, a method based on gray correlation degree is employed to calculate the weights of factors affecting construction process quality. Then the weights are added into the reliability improvement feasible index （RIFI）. Furthermore, a novel nonlinear programming mathematic optimization model is established. In the Insight software environment, the Adaptive Simulated Annealing （ASA） algorithm is used to get a more accurate construction subsystem optimal reliability under different RIFI conditions. In addition, the relationship between construction quality and construction system reliability is analyzed, the proposed methods and detailed processing can offer a useful reference for improving the construction system quality level.

关键词： civil engineering dynamic reliability grey relational degree adaptive simulated annealing algorithm

The d-orbital regulation of isolated manganese sites for enhanced oxygen evolution

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Nano Research 2023年第8期16卷 10796-10802页

作者： Xue bai Jingyi Han Xiaodi Niu Jingqi guan Institute of Physical Chemistry College of ChemistryJilin University2519 Jiefang RoadChangchun 130021China College of Food Science and Engineering Jilin UniversityChangchun 130062China

Developing transition metal-nitrogen-carbon materials(M-N-C)as electrocatalysts for the oxygen evolution reaction(OER)is significant for low-cost energy conversion *** d-orbital adjustment of M center in M-N-C is beneficial to the improvement of OER ***,we synthesize a single-Mn-atom catalyst based on carbon skeleton(Mn_(1)-N_(2)S_(2)C_(x))with isolated Mn-N_(2)S_(2)sites,which exhibits high alkaline OER activity(η10=280 mV),low Tafel slope(44 mV·dec^(−1)),and excellent *** calculations reveal the pivotal function of isolated Mn-N_(2)S_(2)sites in promoting OER,including the adsorption kinetics of intermediates and activation mechanism of active *** doping of S causes the increase in both charge density and work function of active Mn center,and ortho-Mn_(1)-N_(2)S_(2)C_(x)expresses the fastest OER kinetics due to the asymmetric plane.

关键词： dual-heteroatom coordination Mn1-N_(2)S_(2)C_(x) oxygen evolution reaction(OER) single-atom catalyst theoretical calculation

STUDY OF INORG-HYDROPHILIC FILMS ON ALUMINUM FOILS

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中国有色金属学会会刊：英文版 1997年第2期7卷 55-60页

作者： guan, Luxiong Huang, Kelong bai, Yihui Jing, Xiangjun Central South Univ of Technology Changsha China

ＳＴＵＤＹＯＦＩＮＯＲＧＨＹＤＲＯＰＨＩＬＩＣＦＩＬＭＳＯＮＡＬＵＭＩＮＵＭＦＯＩＬＳ①ＧｕａｎＬｕｘｉｏｎｇ，ＨｕａｎｇＫｅｌｏｎｇ，ＢａｉＹｉｈｕｉ，ＪｉｎｇＸｉａｎｇｊｕｎＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓ... 详细信息

ＳＴＵＤＹＯＦＩＮＯＲＧＨＹＤＲＯＰＨＩＬＩＣＦＩＬＭＳＯＮＡＬＵＭＩＮＵＭＦＯＩＬＳ①ＧｕａｎＬｕｘｉｏｎｇ，ＨｕａｎｇＫｅｌｏｎｇ，ＢａｉＹｉｈｕｉ，ＪｉｎｇＸｉａｎｇｊｕｎＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ，ＣｅｎｔｒａｌＳｏｕｔｈＵ...

关键词： hydrophilicity corrosion resistance aluminum heat scattering sheet

Corrosion evolution and behaviour of Al-2.1Mg-1.6Si alloy in chloride media

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Rare Metals 2021年第4期40卷 908-919页

作者： ya-ya Zheng Bing-Hui Luo Chuan He yang Gao Zhen-Hai bai College of Materials Science and Engineering Central South UniversityChangsha 410083China Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle Changsha University of Science and TechnologyChangsha 410114China

Owing to the importance of finding better methods and technologies for protecting against corrosion of aluminium alloys,research into the electrochemical characteristics of the corrosion is an ongoing *** this paper,the corrosion behaviour of Al-Mg-Si alloys in 3.5 wt% NaCl solution was investigated using multiple methods,including scanning electron microscopy(SEM),transmission electron microscopy(TEM),potentiodynamic polarisation measurement and electrochemical impedance spectroscopy(EIS).The results suggest that corrosion begins with dealloying of Mg,followed by conversion of MgSi particles into Al-Fe-Mn-Si *** corrosion rate increased until it reached a peak and then *** increase in the corrosion rate may be attributed to an increased electrochemical driving force,which is produced by anodic dissolution between the matrix and residual MgSi ***,the thin re-deposited layer of inert elements also plays an important role in accelerating the anodic process of the corrosion *** passivated corrosion pit and narrowed intergranular corrosion(IGC)pathway cause the area of active dissolution to decrease,thus reducing the corrosion rate.

关键词： Al-Mg-Si alloys Corrosion behaviour Electrochemical Corrosion rate IGC corrosion pathway

Fabrication of highly efficient Bi2WO6/CuS composite for visible-light photocatalytic removal of organic pollutants and Cr(VI)from wastewater

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Frontiers of Environmental Science & Engineering 2021年第4期15卷 85-97页

作者： Wei Mao Lixun Zhang Tianye Wang Yichen bai Yuntao guan guangdong Provincial Engineering Technology Research Center for Urban Water Cycle and Water Environment Safety Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen518055China State Environmental Protection Key Laboratory of Microorganism Application and Risk Control School of EnvironmentTsinghua UniversityBeijing100084China College of Resources and Environment Jilin Agricultural UniversityChangchun130000China Key Laboratory of Soil Resource Sustainable Utilization for Jilin Province Commodity Grain Bases Changchun130118China

A visible-light-driven Bi_(2)WO_(6)/CuS p-n heterojunction was fabricated using an easy solvothermal *** Bi_(2)WO_(6)/CuS exhibited high photocatalytic activity in a mixed system containing rhodamine B(RhB),tetracycline hydrochloride(TCH),and Cr(VI)under natural *** 98.8%of the RhB(10 mg/L),87.6%of the TCH(10 mg/L)and 95.1%of the Cr(VI)(15 mg/L)were simultaneously removed from a mixed solution within 105 *** removal efficiencies of TCH and Cr(VI)increased by 12.9%and 20.4%,respectively,in the mixed solution,compared with the single *** is mainly ascribed to the simultaneous consumption electrons and holes,which increases the amount of excited electrons/holes and enhances the separation efficiency of photogenerated electrons and ***_(2)WO_(6)/CuS can be applied over a wide pH range(2–6)with strong photocatalytic activity for RhB,TCH and Cr(VI).Coexisiting dissolved organic matter in the solution significantly promoted the removal of TCH(from 74.7%to 87.2%)and Cr(VI)(from 75.7%to 99.9%)because it accelerated the separation of electrons and holes by consuming holes as an electron *** mechanisms of RhB,TCH,and Cr(VI)were proposed,Bi_(2)WO_(6)/CuS was formed into a p-n heterojunction to efficiently separate and transfer photoelectrons and holes so as to drive photocatalytic ***,when reducing pollutants(e.g.,TCH)and oxidizing pollutants(e.g.,Cr(VI))coexist in wastewater,the p-n heterojunction in Bi_(2)WO_(6)/CuS acts as a“bridge”to shorten the electron transport and thus simultaneously increase the removal efficiencies of both types of pollutants.

关键词： Photocatalysis Bi_(2)W〇_(6)/CuS Organic pollutants Cr(VI) Synergistic effect

Determination of activity interaction parameters of Nb in Fe-C-Nb melts at 1873 K

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Journal of Iron and Steel Research International 2022年第3期29卷 403-407页

作者： Jie Zhang Da-ya Wang bai-jun yan State Key Laboratory of Advanced Metallurgy Department of Physical Chemistry of MetallurgySchool of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijing100083China Sinosteel Maanshan General Institute of Mining Research Co. Ltd.Ma’anshan243000AnhuiChina

The interaction parameters of Nb in Fe-C-Nb melts at 1873 K were measured using the chemical equilibrium *** Fe-C melts were equilibrated with the CaO-MgO-Al_(2)O_(3)-NbO_(2) slags under a controlled oxygen potential for 24 *** addition to acting as the protective gas,argon was adopted to control the oxygen *** on the data obtained in the experiments,the activity interaction parameters were obtained by the multiple linear regression *** first-order interaction parameters e_(Nb)^(C)and e_(Nb)^(Nb)are determined to be−0.035 and−0.134,*** second-order interaction parameters r_(Nb)^(C),r_(Nb)^(Nb,C),and r_(Nb)……(Nb)are determined to be 0.011,−0.0063,and 0.0023,*** thermodynamic data obtained are more reliable than those in previous publications for the Fe-C-Nb system when the Nb content range was 0.92-4.62 wt.%.

关键词： Nb Fe-C-Nb melt Chemical equilibrium method First-order interaction parameter Second-order interaction parameter

Improvement in resolution of fiber-laser photoacoustic tomography based on a virtual-point concept

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Visual Computing for Industry,Biomedicine,and Art 2021年第1期4卷 22-28页

作者： Xue bai Xu Li Jun Ma bai-Ou guan guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan UniversityGuangzhou 511443China

In this study,a virtual-point concept was introduced into fiber-laser photoacoustic tomography to improve the elevational image *** flexible fiber laser was bent into an arc shape to conform to the ultrasound wavefront,which formed an ultrasound focus at the center of the *** synthetic aperture focusing technique was utilized to reconstruct the images;as a result,the elevational resolution particularly within the out-of-focus region was considerably improved compared to the resolution of an image retrieved by multiplexing the PA time-resolved signals with sound *** all-optical fiber-laser photoacoustic tomography system with a high spatial resolution has potential for various applications,including biomedical research and preclinical/clinical diagnosis.

关键词： Photoacoustic tomography Fiber laser Virtual point Synthetic aperture focusing

Free-moving-state microscopic imaging of cerebral oxygenation and hemodynamics with a photoacoustic fiberscope

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Light(Science & Applications) 2024年第1期13卷 33-46页

作者： Xiaoxuan Zhong Yizhi Liang Xiaoyu Wang Haoying Lan Xue bai Long Jin bai-Ou guan guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan UniversityGuangzhou510632China

We report the development of a head-mounted photoacoustic fiberscope for cerebral imaging in a freely behaving *** 4.5-gram imaging probe has a 9-µm lateral resolution and 0.2-Hz frame rate over a 1.2-mm wide *** probe can continuously monitor cerebral oxygenation and hemodynamic responses at single-vessel resolution,showing significantly different cerebrovascular responses to external stimuli under anesthesia and in the freely moving *** example,when subjected to high-concentration CO_(2) respiration,enhanced oxygenation to compensate for hypercapnia can be visualized due to cerebral regulation in the freely moving *** studies exhibit significantly weakened compensation capabilities in obese *** new imaging modality can be used for investigating both normal and pathological cerebrovascular functions and shows great promise for studying cerebral activity,disorders and their treatments.

关键词： cerebral anesthesia moving