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INTRAGRANULAR FERRITE FORmED IN ASSOCIATION WITH INCLUSIONS IN A VANADIUm mICROALLOYED STEEL

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Acta metallurgica Sinica(English Letters) 2004年第6期17卷 785-789页

作者： k.m.wu m.Enomoto DepartmentofAppliedPhysics TheHubeiProvinceKeyLaboratoryofRefractionsandCeramies-Ministry-ProvinceJointly-ConstructedCultivationBaseforStateKeyLaboratoryWuhanUniversityofScienceandTechnologyWuhan430081China DepartmentofmaterialsScienceandEngineering IbarakiUniversityNakananusawaHitachi316-8511Japan

Intragranular ferrite was formed at inclusions in a vanadium microalloyed steel with excess amount of sulfur. The chemical composition of inclusions in the steel was analyzed by SEm-EDS. The inclusions were mainly composed of mnS and aluminum oxides. The precipitation of mnS at aluminum oxides might result in mn depletion, which, in turn, pro- motes the formation of intragranular ferrite. Optical and SEm observations and three- dimensional (3D) reconstruction demonstrated that intragranular ferrite was formed at inclusions. The morphology of intragranular ferrite changed with undercooling. At higher temperatures intragranular ferrite was nearly equiaxed whereas it was plate-like or lath-like at lower temperatures.

关键词： steels intragranular ferrite nucleation three-dimensional reconstruction

Three-dimensional morphology of Intragranular Ferrite in an Fe-C-mn Alloy

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Three-dimensional Morphology of Intragranular Ferrite in an ...

Potassium-modified carbon nitride photocatalyzed-aminoacylation of N–sulfonyl ketimines

第二届全国背散射电子衍射（EBSD）技术及其应用学术会议暨第六届全国材料科学与图像科技学术会议

作者： L.Cheng~1 Z.G.Li~2 k.m.wu~1 1 key Laboratory for Ferrous metallurgy and Resources Utilization of ministry of Education,Department of Applied Physics,wuhan University of Science and Technology,wuhan 430081,China. 2 Technology Center,Baosteel Group,Shanghai 201900,China

Intragranular ferrite is an important microstructure in the transformation of weld metals, pipeline steels and other structural *** has a very good combination of high strength and toughness. Three-dimensional morphology of intragranular ferrite idiomorphs and plates or laths nucleated at inclusions in an Fe-0.09%C-1.48%mn alloy was revealed by means of computer-aided three-dimensional reconstruction technique. Specimens were austenitized at 1250℃ under a purified argon atmosphere and isothermally reacted in a salt bath at temperatures ranging from 690℃ to 610℃.The specimens were polished with an automatic grinder polisher,then etched with 3% *** hardness indents were applied using a hardness tester with a Vickers hardness *** polishing,etching and hardness indenting a series of digital optical micrographs were *** digital image was aligned and processed by Scion Image and Adobe Photoshop,*** images were transferred into a volume data set by ImgToVol,and then was visualized using AVS software. 3D reconstruction shows that intragranular ferrite are formed on *** morphology of intragranular ferrite changes with *** higher temperatures(low undercooling) intragranular ferrite appeared to be an equiaxed *** lower temperatures(high undercooling) intragranular ferrite appeared to be a plate or a lath.

关键词： Steels microstructure Intragranualr Ferrite Three-dimensional morphology

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Chinese Chemical Letters 2025年第2期36卷 406-411页

作者： Cailing wu Shaojie wu Qifei Huang kai Sun Xianqiang Huang Jianji Wang Bing Yu Collaborative Innovation Center of Henan Province for Green manufacturing of Fine Chemicals Key Laboratory of Green Chemical Media and ReactionsMinistry of Education School of Chemistry and Chemical Engineering Henan Normal University College of Chemistry Zhengzhou University School of Chemistry & Chemical Engineering Liaocheng University

The development of innovative and sustainable catalytic strategies for organic synthesis is a pivotal aspect of advancing material science and chemical *** research presents a new catalytic method for the aminoacylation of N–sulfonyl ketimines by utilizing a potassium-doped graphite-like carbon nitride （g-C3N4） *** method not only enhances the catalytic efficiency and broadens the light absorption spectrum of g-C3N4but also significantly reduces the recombination rate of electronhole pairs,thereby increasing the reaction yield and ***,our approach facilitates the synthesis of aminoacylated N-heterocycles,expanding the applicability of potassium-modified g-C3N4in photocatalytic organic synthesis.A notable accomplishment of this study is the unprecedented generation of carbamoyl radicals via heterogeneous photocatalysis,which can be easily recycled after *** advancement highlights the capability of potassium-doped g-C3N4（namely k-CN） as an advanced heterogeneous photocatalyst for the formation of complex organic compounds.

关键词： Amides Aminoacylation k+-modified carbon nitride Oxamic acids Photocatalysis

Hydrogeodesy Facilitates the Accurate Assessment of Extreme Drought Events

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Journal of Earth Science 2025年第1期36卷 347-350页

作者： Yunlong wu Yulong Zhong Sulan Liu Guodong Xu Cuiyu Xiao Xiaohui wu Binhong Xie Zilong Li C.k.Shum School of Geography and Information Engineering China University of GeosciencesWuhan 430074China Hubei key Laboratory of Regional Ecology and Environmental Change Wuhan 430074China Department of Land Surveying and Geo-Informatics The Hong Kong Polytechnic UniversityHong Kong 999077China State key Laboratory of Geodesy and Earth's Dynamics Innovation Academy of Precision Measurement of Science and TechnologyChinese Academy of SciencesWuhan 430077China School of Earth Sciences the Ohio State UniversityColumbusOhio 43220USA

1 EXTREmE DROUGHT AND HYDROGEODESY TECHNOLOGIES The World meteorological Organization has officially declared 2023 as the hottest year on record,with the average global temperature surpassing pre-industrial(1850-1900)average by 1.45℃.While temperature is not the only climate observable from the complex processes for the geneses of droughts,recent hottest years have witnessed numerous instances of extreme droughts.

关键词： HYDRO meteorological extreme

Stem-leaf saponins of Panax notoginseng attenuate experimental Parkinson's disease progression in mice by inhibiting microglia-mediated neuroinflammation via P2Y2R/PI3k/AkT/NFκB signaling pathway

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Chinese Journal of Natural medicines 2025年第1期23卷 43-53页

作者： Hui wu Chenyang Ni Yu Zhang Yingying Song Longchan Liu Fei Huang Hailian Shi Zhengtao Wang Xiaojun wu Shanghai key Laboratory of Compound Chinese medicines The Ministry of Education (MOE) Key Laboratory for Standardization of Chinese Medicines Institute of Chinese Materia Medica The MOE Innovation Centre for Basic Medicine Research on Qi-Blood TCM Theories Shanghai University of Traditional Chinese Medicine

Stem-leaf saponins from Panax notoginseng(SLSP) comprise numerous PPD-type saponins with diverse pharmacological properties; however, their role in Parkinson's disease(PD),characterized by microglia-mediated neuroinflammation, remains unclear. This study evaluated the effects of SLSP on suppressing microglia-driven neuroinflammation in experimental PD models, including the 1-methyl-4-phenylpyridinium(mPTP)-induced mouse model and lipopolysaccharide(LPS)-stimulated BV-2 microglia. Our findings revealed that SLSP mitigated behavioral impairments and excessive microglial activation in models of PD, including mPTP-treated mice. Additionally, SLSP inhibited the upregulation of inducible nitric oxide synthase(i NOS) and cyclooxygenase-2(COX2) and attenuated the phosphorylation of PI3k,protein kinase B(AkT), nuclear factor-κB(NFκB), and inhibitor of NFκB protein α(IκBα) both in vivo and in vitro. moreover, SLSP suppressed the production of inflammatory markers such as interleukin(IL)-1β, IL-6, and tumor necrosis factor alpha(TNF-α) in LPS-stimulated BV-2cells. Notably, the P2Y2R agonist partially reversed the inhibitory effects of SLSP in LPStreated BV-2 cells. These results suggest that SLSP inhibit microglia-mediated neuroinflammation in experimental PD models, likely through the P2Y2R/PI3k/AkT/NFκB signaling pathway. These novel findings indicate that SLSP may offer therapeutic potential for PD by attenuating microglia-mediated neuroinflammation.

关键词： microglia NFκB Neuroinflammation P2Y2 receptor Stem-leaf saponins of Panax Notoginseng

Efficient catalysis of FeNiCu-based multi-site alloys on magnesium-hydride for solid-state hydrogen storage

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Chinese Chemical Letters 2025年第1期36卷 603-609页

作者： Shuai Li Liuting Zhang Fuying wu Yiqun Jiang Xuebin Yu School of Energy and Power Instrumental Analysis CenterJiangsu University of Science and TechnologyZhenjiang 212003China Department of materials Science Fudan UniversityShanghai 200433China max Planck Institute for Iron Research Düsseldorf 40237Germany

Hydrogen,as a cheap,clean,and cost-effective secondary energy source,performs an essential role in optimizing today’s energy *** hydride(mg H_(2))represents an attractive hydrogen carrier for storage and transportation,however,the kinetic behavior and operating temperature remain *** this work,a dual-phase multi-site alloy(ms A)anchored on carbon substrates was designed,and its superior catalytic effects on the hydrogen storage properties of mgH_(2) were *** analysis identified that multi-site Fe Ni_(3)/Ni Cu nanoalloys synergistically served as intrinsic drivers for the striking de/hydrogenation performance of the mgH_(2)-ms A ***,the unique multi-metallic site structure attached to the surface of mgH_(2)provided substantial reversible channels and accessible active sites conducive to the adsorption,activation,and nucleation of H *** addition,the coupling system formed by FeNi_(3) and NiCu dual-phase alloys further enhanced the reactivity between mg/mgH_(2) and H ***,the onset dehydrogenation temperature of mg H_(2)+5 wt%ms A was reduced to 195℃ and the hydrogen desorption apparent activation energy was reduced to 83.6 k J/mol.5.08 wt%H_(2) could be released at 250℃ in 20 min,reaching a high dehydrogenation rate of 0.254 wt%H_(2)/min,yet that for mgH_(2) at a higher temperature of 335℃ was only 0.145 wt%H_(2)/***,the dehydrogenated mg H_(2)-ms A sample could absorb hydrogen from room temperature(30℃)and charge 3.93 wt%H_(2) at 100℃ within20 min under 3.0 mPa H_(2) *** from carbon substrates,the 5 wt%ms A doped-mgH_(2) could still maintain 6.36 wt%hydrogen capacity after 20 *** conclusion,this work provides experimental rationale and new insights for the design of efficient catalysts for magnesium-based solid-state hydrogen storage materials.

关键词： Hydrogen storage magnesium hydride Synergistic effect Catalysis multi-site alloys

Tuning the interfacial reaction environment via pH-dependent and induced ions to understand C–N bonds coupling performance in NO_(3)-integrated CO_(2)reduction to carbon and nitrogen compounds over dual Cu-based N-doped carbon catalyst

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Journal of Energy Chemistry 2025年第1期100卷 273-285页

作者： Tianhang Zhou Chen Shen Zhenghao wu Xingying Lan Yi Xiao College of Carbon Neutrality Future Technology State Key Laboratory of Heavy Oil ProcessingChina University of Petroleum(Beijing)Beijing 102249China Department of mechanical and mechatronics Engineering and Waterloo Institute of Nanotechnology University of Waterloo WaterlooOntario N2L 3G1Canada Institute of materials Science TU DarmstadtDarmstadt 64287Germany Department of Chemistry Xi’an Jiaotong-Liverpool UniversitySuzhou 215123JiangsuChina

Dual atomic catalysts(DAC),particularly copper(Cu_(2))-based nitrogen(N)doped graphene,show great potential to effectively convert CO_(2)and nitrate(NO_(3)-)into important industrial chemicals such as ethylene,glycol,acetamide,and urea through an efficient catalytical process that involves C–C and C–N ***,the origin of the coupling activity remained unclear,which substantially hinders the rational design of Cu-based catalysts for the N-integrated CO_(2)reduction reaction(CO_(2)RR).To address this challenge,this work performed advanced density functional theory calculations incorporating explicit solvation based on a Cu_(2)-based N-doped carbon(Cu_(2)N_(6)C_(10))catalyst for CO_(2)*** calculations are aimed to gain insight into the reaction mechanisms for the synthesis of ethylene,acetamide,and urea via coupling in the interfacial reaction *** to the sluggishness of CO_(2),the formation of a solvation electric layer by anions(F^(-),Cl^(-),Br^(-),and I^(-))and cations(Na+,mg^(2+),k+,and Ca^(2+))leads to electron transfer towards the Cu *** process significantly accelerates the reduction of CO_(2).These results reveal that*CO intermediates play a pivotal role in N-integrated CO_(2)***,the Cu_(2)-based N-doped carbon catalyst examined in this study has demonstrated the most potential for C–N coupling to *** findings reveal that through the process of a condensation reaction between*CO and NH_(2)OH for urea synthesis,*NO_(3)-is reduced to*NH_(3),and*CO_(2)to*CCO at dual Cu atom *** dual-site reduction facilitates the synthesis of acetamide through a nucleophilic reaction between NH_(3)and the ketene ***,we found that the I-and mg^(2+)ions,influenced by pH,were highly effective for acetamide and ammonia synthesis,except when F-and Ca^(2+)were ***,the mechanisms of C–N bond formation were investigated via ab-initio molecular dynamics simulations,and we found that adjusti

关键词： pH-dependent micro-environments C-N coupling N-integrated CO_(2)RR Dual Cu-based nitrogen carbon catalysts Explicit solvation model lon stabilizer AImD

When AI meets sustainable 6G

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Science China(Information Sciences) 2025年第1期68卷 4-22页

作者： Xiaohu YOU Yongming HUANG Cheng ZHANG Jiaheng WANG Hao YIN Hequan wu National mobile Communications Research Laboratory Southeast University Purple mountain Laboratories Chinese Academy of military Science China Information Communication Technologies Group

Sixth-generation(6G) networks are anticipated to achieve transformative advancements, characterized by extreme connectivity, deep integration with artificial intelligence(AI) and sensing, and airground integration. The evolution of 6G exhibits two major trends: ubiquitous intelligence and sustainability. The former aims to embed state-of-the-art AI technology into the 6G network, from the physical layers to applications, while the latter emphasizes reducing energy consumption while enhancing network performance to address environmental concerns. Despite the amazing progress in recent years, AI advancements come with substantial increases in data and computational overhead, posing critical challenges for integrating AI into sustainable 6G networks. First, high energy consumption from large datasets and heavyweight AI models contradicts6G's green goals. Second, the precise collection of large datasets, message delivery latency, and inference delays in AI models pose challenges for real-time tasks in 6G. Third, the uninterpretability and unpredictability of AI models complicate meeting the stringent requirements for controllable transmission in dynamic wireless environments. Addressing these challenges and achieving sustainable 6G with ubiquitous intelligence calls for a revolutionary design of 6G architecture and AI frameworks. To this end, this paper introduces a novel and practical methodology for green, real-time, and controllable 6G native intelligence,starting with knowledge graph(kG) analysis to extract small but critical datasets, followed by the development of distributed lightweight AI models, and the use of digital twins(DTs) to create precise replicas of physical 6G networks. This leads to a pervasive multi-level(PmL)-AI framework supported by a task-centric, three-layer 6G architecture. The AI framework operates through non-real-time and real-time cycles, leveraging three key technologies: wireless data kGs for efficient data management,lightweight AI mode

关键词： artificial intelligence sustainable 6G green real-time controllable

Secure beamforming and deployment design for rate-splitting multiple access-based UAV communications

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Science China(Information Sciences) 2025年第1期68卷 342-356页

作者： Bing WANG Xiaofeng TAO Shujun HAN Huici wu kai YANG Zhu HAN National Engineering Research Center of mobile Network Technologies Beijing University of Posts and Telecommunications Peng Cheng Laboratory Department of Electrical and Computer Engineering University of Houston

Rate-splitting multiple access(RSmA) has recently gained attention as a potential robust multiple access(mA)scheme for upcoming wireless networks. Given its ability to efficiently utilize wireless resources and design interference management strategies, it can be applied to unmanned aerial vehicle(UAV) networks to provide convenient services for large-scale access ground users. However, due to the line-of-sight(LoS) broadcast nature of UAV transmission, information is susceptible to eavesdropping in RSmA-based UAV networks. moreover, the superposition of signals at the receiver in such networks becomes complicated. To cope with the challenge, we propose a two-user multi-input single-output(mISO) RSmA-based UAV secure transmission framework in downlink communication networks. In a passive eavesdropping scenario, our goal is to maximize the sum secrecy rate by optimizing the transmit beamforming and deployment location of the UAV-base station(UAV-BS),while considering quality-of-service(QoS) constraints, maximum transmit power, and flight space limitations. To address the non-convexity of the proposed problem, the optimization problem is first decoupled into two subproblems. Then, the successive convex approximation(SCA) method is employed to solve each subproblem using different propositions. In addition, an alternating optimization(AO)-based location RSmA(L-RSmA) beamforming algorithm is developed to implement joint optimization to obtain the suboptimal solution. Numerical results demonstrate that(1) the proposed L-RSmA scheme yields a28.97% higher sum secrecy rate than the baseline L-space division multiple access(SDmA) scheme;(2) the proposed L-RSmA scheme improves the security performance by 42.61% compared to the L-non-orthogonal multiple access(NOmA) scheme.

关键词： rate-splitting multiple access UAV communication precoding optimization deployment location physical layer security

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