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Effect of cerium on microstructure,eutectic carbides and Laves phase in electroslag remelted 15Cr-22Ni-1Nb austenitic heat-resistant steel

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Journal of Iron and Steel Research International 2023年第2期30卷 338-349页

作者： Xin Zhu Cheng-bin Shi Shi-jun Wang Peng Lan Jing Li State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing(USTB)Beijing100083China School of Metallurgical and Ecological Engineering University of Science and Technology Beijing(USTB)Beijing100083China

The dendrites,eutectic carbides,Laves phase and microsegregation of alloying element in electroslag remelted 15Cr-22Ni-1Nb austenitic heat-resistant steel with varying cerium contents were *** liquidus and solidus temperatures of the steel were determined to reveal the effect of cerium on solidification temperature interval and local solidification time of the *** secondary dendrite arm spacing decreases from 57.10 to 40.18μm with increasing the cerium content from 0 to 0.0630 wt.%.The eutectic NbC and Laves phase in as-cast ingots exhibit blocky and honeycomb morphology,*** area fractions and sizes of eutectic NbC and Laves phase in as-cast ingots decrease with the increase in cerium *** atomic percentage of Laves phase-forming element(Ni,Nb,Cr,Mo and Si)decreases with the increase in cerium content of the *** microsegregation of Mo,Ni,Si,Cr and Nb decreases with increasing the cerium content,which is favorable to reducing both the amount and sizes of eutectic NbC and Laves phase in as-cast *** solidification temperature interval and local solidification time of the steel decrease as the cerium content is increased from 0 to 0.0630 wt.%,which inhibits the growth of dendrites,eutectic NbC and Laves phase.

关键词： Heat-resistant steel Rare earth cerium Eutectic NbC Laves phase Microsegregation Solidification characteristics

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Highly selective[4+4]cross-photodimerization of(4a-azonia)anthracenes driven by confinement of D-A hetero-guest pair in cucurbituril host

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Chinese Chemical Letters 2025年第3期36卷 263-266页

作者： Xianchen Hu Junli Yang Fang Gao Zhiyong Zhao Simin Liu School of Chemistry and Chemical Engineering Wuhan University of Science and TechnologyWuhan 430081China The State Key Laboratory of Refractories and Metallurgy Institute of Advanced Materials and NanotechnologyWuhan University of Science and TechnologyWuhan 430081China

The cross-photodimerization often comes with the formation of undesired and competitive homophotodimer as side ***,we report a series of highly selective[4+4]cross-photodimerization between anthracene and 4a-azoniaanthracene derivatives within a cucurbit[10]uril(CB[10])host in *** inclusion complexes were formed through encapsulation of donor(D1-D2,anthracene derivative)and acceptor(A1-A3,4a-azoniaanthracene derivatives)pairs in CB[10].In the presence of CB[10](1.0 equiv.),the[4+4]cross-photodimerization between D1 and A1/A2/A3 efficiently gave a single racemic ***,the cross-photodimerization between 9-substituted anthracene D2 and A1/A3 was catalyzed by CB[10](0.1 equiv.)to quantitatively yield a cross-photodimer with high *** formation of selective cross-photodimers could be attributed to the exclusive encapsulation of D-A hetero-guest pairs in CB[10]and the confinement effect of the CB[10]host *** study further proves host–guest complexation as a powerful strategy for cross-cycloaddition reactions with high efficiency.

关键词： Supramolecular catalysis Cross-photodimerization Host-guest complexation Charge-transfer interaction Cucurbit[10]uril

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Full-Speed Domain Performance Comparison of Traditional and Segmented-Rotor Switched Reluctance Motors 26

Full-Speed Domain Performance Comparison of Traditional and ...

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26th International Conference on Electrical Machines and Systems, ICEMS 2023

作者： Zhao, Ziqi Sun, Jianbo Gan, Chun Wang, Shuanghong Yang, Yang Yu, Zhiyue Wei, Huangli Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnets Engineering and Technology Wuhan China Guangdong Power Grid Co. Ltd. Dongguan Power Supply Bureau Dongguan China

ISBN: (纸本)9798350317589

In this paper, to investigate the superiority of the segmented rotor structure, a full-speed domain comparative study of the traditional and segmented-rotor switched reluctance motors is put forward, which comprehensively reflects the performance differences between the two motors. The static inductance characteristics of these two motors are analyzed by means of electromagnetic simulation, followed by a comparative performance analysis under three operating conditions: constant torque region, constant power region, and series excitation region, and the reasons for the performance differences are given. Finally, the external characteristics of the two motors are analyzed comprehensively. The work in this paper provides guidance for the optimal design of SSRM. © 2023 IEEE.

关键词： Electromagnetic simulation

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Tuning Structural and Electronic Configuration of FeN_(4) via External S for Enhanced Oxygen Reduction Reaction

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Energy & Environmental Materials 2024年第2期7卷 93-101页

作者： Shidong Li Lixue Xia Jiantao Li Zhuo Chen Wei Zhang Jiexin Zhu Ruohan Yu Fang Liu Sungsik Lee Yan Zhao Liang Zhou Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan 528200China Chemical Sciences and Engineering Division Argonne National Laboratory9700 South Cass AvenueLemontIL 60439USA NRC(Nanostructure Research Centre) Wuhan University of TechnologyWuhan 430070China X-ray Science Division Advanced Photon SourcesArgonne National Laboratory9700 South CassAvenueLemontIL 60439USA State Key Laboratory of Silicate Materials for Architectures International School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China The Institute of Technological Sciences Wuhan UniversityWuhan 430072China Hubei Longzhong Laboratory Xiangyang 441000China

The Fe-N-C material represents an attractive oxygen reduction reaction electrocatalyst,and the FeN_(4)moiety has been identified as a very competitive catalytic active *** tuning of the coordination structure of FeN_(4)has an essential impact on the catalytic ***,we construct a sulfur-modified Fe-N-C catalyst with controllable local coordination environment,where the Fe is coordinated with four in-plane N and an axial external *** external S atom affects not only the electron distribution but also the spin state of Fe in the FeN_(4)active *** appearance of higher valence states and spin states for Fe demonstrates the increase in unpaired *** the above characteristics,the adsorption and desorption of the reactants at FeN_(4)active sites are optimized,thus promoting the oxygen reduction reaction *** work explores the key point in electronic configuration and coordination environment tuning of FeN_(4)through S doping and provides new insight into the construction of M-N-C-based oxygen reduction reaction catalysts.

关键词： coordination structure electronic configuration FeN_(4)moiety oxygen reduction reaction sulfur doping

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Towards optimized tensor code generation for deep learning on sunway many-core processor

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Frontiers of Computer Science 2024年第2期18卷 1-15页

作者： Mingzhen LI Changxi LIU Jianjin LIAO Xuegui ZHENG Hailong YANG Rujun SUN Jun XU Lin GAN Guangwen YANG Zhongzhi LUAN Depei QIAN State Key Laboratory of Software Development Environment Beijing 100191China School of Computer Science and Engineering Beihang UniversityBeijing 100191China National University of Singapore Singapore 119077Singapore State Key Laboratory of Mathematical Engineering and Advanced Computing Wuxi 214000China Science and Technology on Special System Simulation Laboratory Beijing Simulation Center Beijing 100854China Department of Computer Science and Technology Tsinghua UniversityBeijing 100084China

The flourish of deep learning frameworks and hardware platforms has been demanding an efficient compiler that can shield the diversity in both software and hardware in order to provide application *** the existing deep learning compilers,TVM is well known for its efficiency in code generation and optimization across diverse hardware *** the meanwhile,the Sunway many-core processor renders itself as a competitive candidate for its attractive computational power in both scientific computing and deep learning *** paper combines the trends in these two ***,we propose swTVM that extends the original TVM to support ahead-of-time compilation for architecture requiring cross-compilation such as *** addition,we leverage the architecture features during the compilation such as core group for massive parallelism,DMA for high bandwidth memory transfer and local device memory for data locality,in order to generate efficient codes for deep learning workloads on *** experiment results show that the codes generated by swTVM achieve 1.79x improvement of inference latency on average compared to the state-of-the-art deep learning framework on Sunway,across eight representative *** work is the first attempt from the compiler perspective to bridge the gap of deep learning and Sunway processor particularly with productivity and efficiency in *** believe this work will encourage more people to embrace the power of deep learning and Sunwaymany-coreprocessor.

关键词： sunway processor deep learning compiler code generation performance optimization

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Fractional-order Virtual Inertia Control and Parameter Tuning for Energy-storage System in Low-inertia Power Grid

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Protection and Control of Modern Power Systems 2024年第5期9卷 70-83页

作者： Yukai Zeng Qiufan Yang Yujun Lin Yin Chen Xia Chen Jinyu Wen State Key Laboratory of Advanced Electromagnetic Engineering Huazhong University of Science and TechnologyWuhan 430074China Department of Electronic and Electrical Engineering University of StrathclydeGlasgow G11XWU.K.

As conventional synchronous generators are replaced by large-scale converter-interfaced renewa-ble-energy sources(RESs),the electric power grid en-counters the challenge of low rotational ***-quently,system frequency deviation is exacerbated and system instability may occur when the frequency deviates beyond the acceptable *** mitigate this effect,this study proposes a virtual inertia control(VIC)strategy based on a fractional-order derivative and controller parameter-tuning *** tuning method uses the stability boundary locus and provides a stability criterion for identifying the stability region in the parameter *** controller parameters are then optimized within the identified stability region to suppress frequency deviation and enhance system *** proposed controller and tuning method is applied to a battery energy-storage system(BESS)in a low-inertia power system with the integration of ***-domain simulations are carried out to verify the stability region and compare the per-formance of the optimized proposed controller to that of the traditional integral-order *** simulation results show that the stability-analysis method is effective and that the fractional-order VIC,tuned with the pro-posed method,outperforms the traditional method in both frequency-regulation performance and parametric robustness.

关键词： Virtual inertia control frequency regulation fractional-order controller stability region parameter tuning

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Construction of dendritic Pt–Pd bimetallic nanotubular heterostructure for advanced oxygen reduction

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Interdisciplinary Materials 2024年第6期3卷 907-918页

作者： Mingwei Wang Zhiyi Hu Jieheng Lv Zhiwen Yin Zhewei Xu Jingfeng Liu Shihao Feng Xiaoqian Wang Jiazhen He Sicheng Luo Dafu Zhao Hang Li Xuemin Luo Qi Liu Damin Liu Baolian Su Dongyuan Zhao Yong Liu International School of Materials Science and Engineering(ISMSE) State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhanChina Department of Chemistry Laboratory of Inorganic Materials ChemistryUniversity of NamurNamurBelgium Department of Chemistry Laboratory of Advanced MaterialsShanghai Key Lab of Molecular Catalysis and Innovative MaterialsState Key Laboratory of Molecular Engineering of PolymersFudan UniversityShanghaiChina

Compositions and morphologies of Pt-based electrocatalysts have great impact on the electrocatalytic activity and stability of oxygen reduction reaction(ORR).Herein,we report a novel design of one-dimensional(1D)Pt-Pd dendritic nanotubular heterostructures(DTHs)by controlling the degree of Pt 2+-Pt reduction reaction and Pd-Pt galvanic replacement reaction with uniform Pd nanowires as sacrificial *** obtained Pt-Pd bimetallic DTHs catalyst exhibited uniform and dense Pt dendritic nanobranches on the surface of 1D hollow Pt-Pd alloy nanotubes,possessing superior catalytic activity for ORR compared to state-of-the-art commercial Pt/C ***,the Pt_(4)Pd DTHs catalyst showed efficient mass activity(MA,1.05 A mg_(Pt)^(−1))and specific activity(SA,1.25 mA cm_(Pt)^(−2))at 0.9 V(***),and the catalyst exhibited high stability with 90.4%MA retention after 20000 potential *** Pt-Pd bimetallic DTHs configuration combines the advantages of 1D hollow nanostructures and dense Pt dendritic nanobranches,which results in rich electrochemical active surface sites,fast charge transport,and multiple dendritic anchoring points contact on carbon support,thus boosting its catalytic activity and stability towards electrocatalysis.

关键词： dendritic hollow heterostructures electrocatalysis one-dimensional nanowires oxygen reduction proton exchange membrane fuel cells

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Carbon-coated ZnO Nanocomposite Microspheres as Anode Materials for Lithium-ion Batteries

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Journal of Wuhan University of technology(Materials Science) 2023年第3期38卷 490-495页

作者：范影强陈秀娟 XU Dan State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050China School of Mechanical and Electronical Engineering Lanzhou University of TechnologyLanzhou 730050China

The carbon-coated ZnO nanospheres materials have been synthesized via a simple hydrothermal *** effect of carbon content on the microstructure,morphology and electrochemical performance of the materials was investigated by XRD,Raman spectroscopy,transmission electron microscopy,scanning electron microscopy and electrochemical *** results show that the spherical ZnO/C material with a carbon cladding content of 10%is very homogeneous and approximately 200 nm in *** electrochemical performances of the ZnO/C nanospheres as an anode materials are *** ZnO/C exhibits better stability than pure ZnO,excellent lithium storage properties as well as improved circulation *** Coulomb efficiency of the ZnO/C with 10%carbon coated content reaches 98%.The improvement of electrochemical performance can be attributed to the carbon layer on the ZnO *** large volume change of ZnO during the charge-discharge process can be effectively relieved.

关键词： ZnO carbon coating anode material lithium-ion batteries

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Isotropic sintering shrinkage of 3D glass-ceramic nanolattices:backbone preforming and mechanical enhancement

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International Journal of Extreme Manufacturing 2024年第2期6卷 418-426页

作者： Nianyao Chai Yunfan Yue Xiangyu Chen Zhongle Zeng Sheng Li Xuewen Wang Center of Femtosecond Laser Manufacturing for Advanced Materials and Devices State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhan 430070People’s Republic of China National Energy Key Laboratory for New Hydrogen-Ammonia Energy Technologies Foshan Xianhu LaboratoryFoshan 528000People’s Republic of China International School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070People’s Republic of China

There is a perpetual pursuit for free-form glasses and ceramics featuring outstanding mechanical properties as well as chemical and thermal *** is a promising idea to shape inorganic materials in three-dimensional(3D)forms to reduce their weight while maintaining high mechanical properties.A popular strategy for the preparation of 3D inorganic materials is to mold the organic–inorganic hybrid photoresists into 3D micro-and nano-structures and remove the organic components by subsequent ***,due to the discrete arrangement of inorganic components in the organic-inorganic hybrid photoresists,it remains a huge challenge to attain isotropic shrinkage during ***,we demonstrate the isotropic sintering shrinkage by forming the consecutive–Si–O–Si–O–Zr–O–inorganic backbone in photoresists and fabricating 3D glass–ceramic nanolattices with enhanced mechanical *** femtosecond(fs)laser is used in two-photon polymerization(TPP)to fabricate 3D green body *** subsequent sintering at 1000℃,high-quality 3D glass–ceramic microstructures can be obtained with perfectly intact and smooth ***-suit compression experiments and finite-element simulations reveal that octahedral-truss(oct-truss)lattices possess remarkable adeptness in bearing stress concentration and maintain the structural integrity to resist rod bending,indicating that this structure is a candidate for preparing lightweight and high stiffness glass–ceramic nanolattices.3D printing of such glasses and ceramics has significant implications in a number of industrial applications,including metamaterials,microelectromechanical systems,photonic crystals,and damage-tolerant lightweight materials.

关键词： 3D printing isotropic shrinkage femtosecond laser two-photon polymerization structural glass-ceramics

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A supersaturated Cu-Ag nanoalloy joint with ultrahigh shear strength and ultrafine nanoprecipitates for power electronic packaging

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Journal of Materials Science & technology 2023年第14期145卷 56-65页

作者： Wenwu Zhang Penghao Zhang Dashi Lu Hao Pan Xiangli Liu Chengyan Xu Jun Wei Mingyu Li Hongjun Ji The State Key Laboratory of Advanced Welding and Joining School of Materials Science and EngineeringHarbin Institute of Technology at ShenzhenShenzhen 518055China Sauvage Laboratory for Smart Materials School of Materials Science and EngineeringHarbin Institute of Technology(Shenzhen)Shenzhen 518055China Shenzhen Key Laboratory of Flexible Printed Electronics Technology Harbin Institute of Technology(Shenzhen)Shenzhen 518055China

Ag-Cu bimetallic nanoalloy,integrating the advantages of reducing migration and cost of nano-Ag and alleviating oxidation of nano-Cu,is a prospective bonding material for power electronic *** Ag-coated Cu nanoparticles(Cu@Ag NPs)paste can execute bonding with high quality at 250℃,and the achieved supersaturated Ag-Cu nanoalloy joint with ultrahigh shear strength(152 MPa)dramatically exceeds most nano-paste *** interstitial solid solutions with atomic-level metallurgical bonds at the interface dominantly promoted the shear ***,the numerous ultrafine nanograin,high proportion of low angle grain boundaries(7.44%)without deformation,and the Cu nanoprecipitates in the joint would improve ***,the high content(16.8%)of∑3 twin boundaries would contribute to the electrical and thermal ***,the multiple strengthening mechanisms with the solid solution,the second precipitated phase,and ultrafine nanograin can dramatically enhance shear strength and electro-thermal conductivity of joints for high-temperature device packaging.

关键词： Supersaturated Ag-Cu solid solution Cu nanoparticle precipitates Ultrafine nanograin Strengthening mechanism Electronic packaging

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