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Influence of Mo on Growth and Coarsening of Nanometer-sized Carbides in Low-alloy Ferritic Steels Containing Ti

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Journal of Iron and Steel Research International 2014年第9期21卷 878-885页

作者： Bin-hao HU Qing-wu cai Hui-bin wu Engineering Research Institute University of Science and Technology Beijing

By optical microscopy, transmission electron microscopy and energy dispersive spectroscopy, the changes with aging time in size, composition and distribution of nanometer-sized （Ti, Mo）C precipitated in Ti-Mo low-alloy ferritc steel have been studied in comparison with that of nanometer-sized TiC precipitated in Ti low-alloy ferritc steel. It was found that the growth rate of （Ti,Mo）C in Ti-Mo steel was less than that of TiC in Ti steel. Nanometer- sized carbides formed at 650 ~C （or 550 ~C） for 55 h were at transitional stage from growth to coarsening. When aging time reaches 55 h, the coarsening rates of nanometer-sized carbides in Ti and Ti-Mo steel tend to be the same and in- variable. The influence of Mo on growth and coarsening of nanometer-sized carbides tends to decrease with increasing aging time, and Mo contents in nanometer-sized carbides with the same size at different aging time were different.

关键词： Ti-Mo low alloy ferritic steel nanometer-sized carbide precipitation strengthening Ostwald coarsening

Local structure engineering for active sites in fuel cell electrocatalysts

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Science China Chemistry 2020年第11期63卷 1543-1556页

作者： Han Cheng Renjie Gui si Liu Yi Xie Changzheng wu Hefei National Laboratory for Physical Science at the Microscale CAS Centre for Excellence in NanoscienceCollaborative Innovation Centre of Chemistry for Energy Materials(iChEM)CAS Key Laboratory of Mechanical Behavior and Design of MaterialsUniversity of Science and Technology of ChinaHefei 230026China Institute of Energy Hefei Comprehensive National Science CenterHefei 230026China

In this review,we surveyed the significance of local structure engineering on electrocatalysts and electrodes for the performance of oxygen reduction reaction(ORR)in proton exchange membrane fuel cells(PEMFCs).Both on precious metal catalysts(PMC)and non-precious metal catalysts(NPMC),the main methods to modulate local structure of active sites have been *** change of atomic coordination,modulation of bonding distortion and synergy effect from hierarchical structure,local structure engineering has influence on the intrinsic activity and stability of ***,we emphasized the intimate correlation between lyophobicity of electrocatalysts and membrane electrodes by local structure *** review aimed to inspire the exploration of advanced electrocatalysts and mechanism study for PEMFCs based on local structure engineering.

关键词： local structure engineering proton exchange membrane fuel cells oxygen reduction reaction active sites

Kinetics of Precipitation Behavior of Second Phase Particles in Ferritic Ti-Mo Microalloyed Steel

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Journal of Iron and Steel Research International 2013年第7期20卷 69-77页

作者： HU Bin-hao cai Qing-wu wu Hui-bin Engineering Research Institute University of Science and Technology Beijing

Two types of stress relaxation tests were carried out to investigate the incubation time for incipient precipi-tation of Ti（C,N） in deformed austenite and （Ti,Mo）C in ferrite of ferritic Ti-Mo microalloyed steel The size dis-tribution, amount and chemical composition of precipitates were obtained by using physicochemical phase analysis, and calculated according to thermodynamics and kinetics. The experimental results demonstrated that the incubation time was reduced with increasing Ti content, and prolonged with the addition of Mo. After 30 % deformation at 850 ℃, the nucleation of strain-induced Ti（C,N） was a relatively slow process. On the other hand, the temperature where the nucleation rate of （Ti, Mo）C in ferrite was the highest descended first and then ascended with increasing Ti content, and so did the temperature where the incubation time was the shortest. The key point is that the tempera-ture of steel containing about 0.09 % Ti is the lowest. The mass fraction of MC-type particles with size smaller than 10 nm in steel containing 0.09% Ti and 0.2% Mo reached 73.7%. The size distributions of precipitates in steel containing 0.09% Ti were relatively concentrated compared with that in steel containing 0.07% Ti.

关键词： ferritic Ti-Mo microalloyed steel precipitation behavior second phase particle stress relaxation parti-cle size distribution

Operando modeling and measurements:Powerful tools for revealing the mechanism of alkali carbonate-based sorbents for CO_(2)capture in real conditions

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Frontiers in Energy 2023年第3期17卷 380-389页

作者： Tianyi cai Mengshi WANG Xiaoping CHEN Ye wu Jiliang MA wu ZHOU School of Energy and Power Engineering Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China Key Laboratory of Energy Thermal Conversion and Control of the Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China Key Laboratory of Thermal Control of Electronic Equipment and Advanced Combustion Laboratory of the Ministry of Industry and Information Technology School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing 210094China

Alkalicarbonate-based sorbents(ACSs),including Na_(2)CO_(3)-and K2CO_(3)-based sorbents,are promising for CO_(2)***,the complex sorbent components and operation conditions lead to the versatile kinetics of CO_(2)sorption on these *** paper proposed that operando modeling and measurements are powerful tools to understand the mechanism of sorbents in real operating conditions,facilitating the sorbent development,reactor design,and operation parameter *** reviewed the theoretical simulation achievements during the development of *** elucidated the findings obtained by utilizing density functional theory(DFT)calculations,ab initio molecular dynamics(AIMD)simulations,and classical molecular dynamics(CMD)simulations as *** hygroscopicity of sorbent and the humidity of gas flow are crucial to shifting the carbonation reaction from the gas-solid mode to the gas-liquid mode,boosting the ***,it briefly introduced a machine learning(ML)approach as a promising method to aid sorbent ***,it demonstrated a conceptual compact operando measurement system in order to understand the behavior of ACSs in the real operation *** proposed measurement system includes a micro fluidizedbed(MFB)reactor for kinetic analysis,a multi-camera sub-system for 3D particle movement tracking,and a combined Raman and IR sub-system for solid/gas components and temperature *** is believed that this system is useful to evaluate the real-time sorbent performance,validating the theoretical prediction and promoting the industrial scale-up of ACSs for CO_(2)capture.

关键词： CO_(2)capture carbonation theoretical modeling operando techniques reaction visualization

Superfluid states in α–T_(3) lattice

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Chinese Physics B 2021年第6期30卷 137-142页

作者： Yu-Rong wu Yi-cai Zhang School of Physics and Materials Science Guangzhou UniversityGuangzhou 510006China

The superfluid states of attractive Hubbard model in α–T_(3) lattice are investigated. It is found that one usual needs three non-zero superfluid order parameters to describe the superfluid states due to three sublattices. When two hopping amplitudes are equal, the system has particle–hole symmetry. The flat band plays an important role in superfluid pairing near half filling. For example, when the filling factor falls into the flat band, the large density of states in the flat band favors superfluid pairing and the superfluid order parameters reach relatively large values. When the filling factor is in the gap between the flat band and upper band, the superfluid order parameters take small values due to the vanishing of density of states. The superfluid order parameters show nonmonotonic behaviors with the increase of filling factor. At last, we also investigate the edge states with open boundary conditions. It is shown that there exist some interesting edge states in the middle of quasi-particle bands.

关键词： superfluid states flat band α–T_(3)lattice particle–hole symmetry

Comprehensive early warning of rock burst utilizing microseismic multi-parameter indices

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International Journal of Mining Science and Technology 2018年第5期28卷 767-774页

作者： Linming Dou wu cai Anye Cao Wenhao Guo Key Laboratory of Deep Coal Resource Mining (Ministry of Education of China) School of Mines China University of Mining & Technology

Rock bursts have become one of the most severe risks in underground coal mining and its early warning is an important component in the safety management. Microseismic(MS) monitoring is considered potentially as a powerful tool for the early warning of rock burst. In this study, an MS multi-parameter index system was established and the critical values of each index were estimated based on the normalized multi-information warning model of coal-rock dynamic failure. This index system includes bursting strain energy(BSE) index, time-space-magnitude independent information(TSMII) indices and timespace-magnitude compound information(TSMCI) indices. On the basis of this multi-parameter index system, a comprehensive analysis was conducted via introducing the R-value scoring method to calculate the weights of each index. To calibrate the multi-parameter index system and the associated comprehensive analysis, the weights of each index were first confirmed using historical MS data occurred in LW402102 of Hujiahe Coal Mine(China) over a period of four months. This calibrated comprehensive analysis of MS multi-parameter index system was then applied to pre-warn the occurrence of a subsequent rock burst incident in LW 402103. The results demonstrate that this multi-parameter index system combined with the comprehensive analysis are capable of quantitatively pre-warning rock burst risk.

关键词： Rock burst Microseismic(MS)monitoring Multi-parameter indices Comprehensive early warning

Nitrogen-doped hierarchical porous carbon materials derived from diethylenetriaminepentaacetic acid (DTPA) for supercapacitors

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Journal of Materials Science & Technology 2018年第12期34卷 2384-2391页

作者： Tinghuan wu Lixian Sun Fen Xu Dan cai School of Materials Science and Engineering Guilin University of Electronic TechnologyGuilin541004China Guangxi Key Laboratory oflnforrnation Materials Guilin 541004China Guangxi Collaborative Innovation Center of Structure and Property for New Energy and Materials Guilin 541004China

Nitrogen-doped porous carbon materials（NPCs） have been successfully fabricated by a simple one-step pyrolysis of diethylenetriaminepentaacetic acid（DTPA） in the presence of KOH. The as-synthesized NPCs displayed a high specific surface area(3214 m;g;) and a well-defined porous structure when the annealing temperature reached 800 ℃, which showed superior electrochemical performance as supercapacitor electrode materials. Electrochemical tests showed that the NPCs achieved an impressive specific capacitance of 323 F g;at a current density of 0.5 A g;in 6 M KOH aqueous solution and an outstanding cycle stability, negligible specific capacitance decay after 5000 cycles at 10 A g;. This strategy offered a new insight into the preparation of novel carbon materials for the advanced energy storage devices, such as supercapacitors, fuel cells and lithium ion batteries.

关键词： Supercapacitors DTPA Nitrogen-doped porous carbon materials

First stem cell transplantation to regenerate human lung

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Protein & Cell 2018年第3期9卷 244-245页

作者： si Wang Jun wu Guang-Hui Liu National Laboratory of Biomacromolecules CAS Center for Excellence in Biomacromolecules Institute of Biophysics Chinese Academy of Sciences Beijing 100101 China University of Chinese Academy of Sciences Beijing 100049 China National Clinical Research Center for Geriatric Disorders Xuanwu Hospital of Capital Medical University Beijing 100053 China Department of Molecular Biology University of Texas Southwestern Medical Center Dallas TX 75390 USA Hamon Center for Regenerative Science and Medicine University of Texas Southwestern Medical Center Dallas TX 75390 USA

Lung-related diseases are the third-leading cause of human death throughout the world. Lethal lung diseases such as chronic obstructive pulmonary disease （COPD）, pulmonary fibrosis and bronchiectasis are characteriz...

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Biodegradation of phenol and m-cresol by mutated Candida tropicalis

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Journal of Environmental Sciences 2010年第4期22卷 621-626页

作者： Yan Jiang Xun cai Di wu Nanqi Ren State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology Harbin 150090 China. Department of Chemical Engineering Daqing Oilfield Engineering Limited Company Daqing 163712 China School of Life Sciences and Chemistry Harbin University Harbin 150016 China

The phenol and m-cresol biodegradations were studied using the mutant strain CTM 2 obtained by the He-Ne laser irradiation on wild-type Candida tropicalis. The results showed that C. tropicalis exhibited the increased capacity of phenolic compounds degradation after laser irradiation. It could degrade 2600 mg/L phenol and 300 mg/L m-cresol by 5% inoculum concentration, respectively. In the dual-substrate biodegradation system, 0-500 mg/L phenol could accelerate m-cresol biodegradation, and 300 mg/L m-cresol could be completely utilized within 46 hr at the presence of 350 mg/L phenol. Besides, the maximum biodegradation of m-cresol could reach 350 mg/L with 80 mg/L phenol within 61 hr. Obviously, phenol, as a growth substrate, could promote CTM 2 to degrade m-cresol, and was always preferentially utilized as carbon source. Comparatively, low-concentration m-cresol could result in a great inhibition on phenol degradation. In addition, the kinetic behaviors of cell growth and substrate biodegradation were described by kinetic model proposed in our laboratory.

关键词： biodegradation the mutant strain CTM 2 phenol m-cresol kinetic