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New Technology of Multidirectional Loading Rotary Extrusion

Chinese Journal of Mechanical Engineering 2023年第5期36卷 353-363页

作者： Zhimin Zhang Yong xue Xing Zhang Beibei Dong Mei Cheng zhe Chen National Defense Science and Technology Industry Complex Component Extrusion Technology Innovation Center North University of ChinaTaiyuan 030051China School of Materials Science and Engineering North University of ChinaTaiyuan 030051China

To satisfy the requirements for the precise formation of large-scale high-performance lightweight components with inner ring reinforcement, a new multidirectional loading rotary extrusion forming technology is developed to match the linear motion with the rotary motion and actively increases the strong shear force. Its principle is that the radial force and rotating torque increase when the blank is axially extruded and loaded. Through the synergistic action of axial, radial, and rotating motions, the orderly fow of metal is controlled, and the cumulative severe plastic deformation (SPD) of an“uplift-trowel” micro-area is generated. Consequently, materials are uniformly strengthened and toughened. Simultaneously, through the continuous deformation of a punch “ellipse-circle,” a high reinforcement component is grown on the cylinder wall to achieve the high-quality formation of cylindrical parts or the inner-ring-reinforcement components. Additionally, the efective strain increases with rotation speed, and the maximum intensity on the basal plane decreases as the number of revolutions increase. The punch structure also afects the axial extrusion loading and equivalent plastic strain. Thus, the proposed technology enriches the plastic forming theory and widens the application feld of plastic forming. Furthermore, the formed large-scale high-performance inner-ring-stifened magnesium components have been successfully verifed in aerospace equipment, thereby solving the problems of integral forming and severe deformation strengthening and toughening. The developed technology has good prospects for mass production and application.

关键词： Multidirectional loading Rotary extrusion Inner ring reinforcement Severe plastic deformation Anisotropy

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NiCo-LDH/Ti3C2 MXene hybrid materials for lithium ion battery with high-rate capability and long cycle life

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Journal of Energy Chemistry 2020年第11期29卷 143-153页

作者： Rui Zhang zhe xue Jiaqian Qin Montree Sawangphnjk Xinyu Zhang Riping Liu State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004HebeiChina Research Unit of Advanced Materials for Energy Storage Metallurgy and Materials Science Research InstituteChulalongkorn UniversityBangkok 10330Thailand Centre of Excellence for Energy Storage Technology(CEST) Department of Chemical and Biomolecular EngineeringSchool of Energy Science and EngineeringVidyasirimedhi Institute of Science and TechnologyRayo ng 21210Thailand

Nickel/cobalt-layered double hydroxides(Ni Co-LDH) have been attracted increasing interest in the applications of anode materials for lithium ion battery(LIB), but the low cycle stability and rate performance are still limited its practice applications. To achieve high performance LIB, the surface-confined strategy has been applied to design and fabricate a new anode material of NiCo-LDH nanosheet anchored on the surface of Ti3C2 MXene(Ni Co-LDH/Ti3C2). The ultra-thin, bended and wrinkled α-phase crystal with an interlayer spacing of 8.1 ? can arrange on the conductive substrates Ti3C2 MXene directly, resulting in high electrolyte diffusion ability and low internal resistance. Furthermore, chemical bond interactions between the highly conductive Ti3C2 MXene and Ni Co-LDH nanosheets can greatly increase the ion and electron transport and reduce the volume expansion of NiCo-LDH during Li ion intercalation. As expected,the discharge capacity of 562 m Ah g-1 at 5.0 A g-1 for 800 cycles without degradation can be achieved,rate capability and cycle performance are better than that of NiCo-LDH(~100 mAh g-1). Furthermore, the density function theory(DFT) calculations were performed to demonstrate that Ni Co-LDH/Ti3C2 system can be used as a highly desirable and promising anode material for lithium ion battery.

关键词： MXene Ti3C2 NiCo-LDH Lithium ion battery First-principles calculation

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Measurement of heterogeneous uptake of NO2 on inorganic particles, sea water and urban grime

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Journal of Environmental Sciences 2021年第8期33卷 124-135页

作者： Chuan Yu zhe Wang Qingxin Ma Likun xue Christian George Tao Wang Environment Research Institute Shandong UniversityQingdao 266237China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong Kong 999077China Division of Environment and Sustainability The Hong Kong University of Science and TechnologyHong Kong 999077China Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China Univ Lyon UniversitéClaude Bernard Lyon 1Centre National de la Recherche Scientifique(CNRS)Institut de Recherches sur la Catalyse et l’Environnement de Lyon(IRCELYON)Villeurbanne F-69626France

Heterogeneous reactions of NO2 on different surfaces play an important role in atmospheric NOxremoval and HONO formation,having profound impacts on photochemistry in polluted urban *** studies have suggested that the NO2 uptake on the ground or aerosol surfaces could be a dominant source for elevated HONO during the ***,the uptake behavior of NO2 varies with different surfaces,and different uptake coefficients were used or derived in different *** obtain a more holistic picture of heterogeneous NO2 uptake on different surfaces,a series of laboratory experiments using different flow tube reactors was conducted,and the NO2 uptake coefficients(γ)were determined on inorganic particles,sea water and urban *** results showed that heterogeneous reactions on those surfaces were generally weak in dark conditions,with the measuredγvaried from<10-8 to 3.2×10-7 under different humidity.A photo-enhanced uptake of NO2 on urban grime was observed,with the obvious formation of HONO and NO from the heterogeneous *** photo-enhancedγwas measured to be 1.9×10-6 at 5%relative humidity(RH)and 5.8×10-6 at 70%RH on urban grime,showing a positive RH dependence for both NO2 uptake and HONO *** results demonstrate an important role of urban grime in the daytime NO2-to-HONO conversion,and could be helpful to explain the unknown daytime HONO source in the polluted urban area.

关键词： NO2 uptake HONO source Heterogeneous uptake coefficient Urban grime

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Formation and strengthening mechanism of kink bands in an ultra-coarse-grained Fe-Cr-Al alloy

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Journal of Materials Science & Technology 2024年第19期186卷 1-14页

作者： Wei Luo Teng xue Ding Zuo Jingze Cheng zhe Liu Huiqun Liu School of Materials Science and Engineering Central South UniversityChangsha 410083China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China

Fe-Cr-Al alloys,owing to their absence of allotropic transformation,require multiple cycles of rolling and recrystallization annealing processes to achieve substantial grain refinement,ultimately leading to the attainment of outstanding mechanical ***,the corresponding manufacturing costs will also increase *** this work,we have proposed a new microstructural preparation ***-ply using warm rolling for an ultra-coarse-grained Fe-Cr-Al alloy to introduce lamellar kink bands(KBs)into the matrix,the mechanical properties can be significantly *** using electron backscatter diffraction(EBSD)and transmission electron microscopy(TEM),and combined with Schmid factor(SF)calculation,the formation mechanism of KBs has been *** the slip plane and direction are nearly perpendicular to the loading force direction(LFD)during the continuous grain rotation,the dislo-cation wall will evolve into the KBs ***,a huge orientation separation between the matrix and KBs will be *** strain continues to rise,KBs undergo a transformation,tran-sitioning from low-angle-grain boundaries(LAGBs)to high-angle-grain boundaries(HAGBs),occasionally adopting a configuration as coincident site lattice(CSL)boundaries with reduced interface ***-sults of the tensile test,cyclic loading-unloading-reloading tensile test,and the strengthening calculation show that KBs can pronouncedly enhance the strength by their heterogeneous refinement on the original grains and hetero-deformation induced(HDI)strengthening effect from the dislocation density discrep-ancy between the matrix and internal KBs,the grains containing KBs(KBGs)and the grains without KBs(or KBs-free-grains,KFGs).The theoretical calculation value of the strengthening contribution from KBs on yield strength can be up to 225.5 MPa,with a minimum value exceeding 153 *** the other hand,the ductility can be retained to some extent through stimulating the KBs boundary de

关键词： Fe-Cr-Al alloy Kink bands(KBs) Heterogenous refinement Hetero-deformation induced(HDI) strengthening KBs boundary delamination

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Retaining the self-released chalcogenate at reconstructed cobalt sites by self-transformed carbonate regulation for boosted oxygen evolution

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Journal of Energy Chemistry 2024年第10期97卷 46-54,I0002页

作者： Jingxuan Zhao zhe xue Qing Wang Xiangyang Li Shoujie Liu Xu Zhao School of Chemical Engineering and Technology Xi'an Jiaotong UniversityXi'an 710049ShaanxiChina Key Laboratoryof Materials Physics Instituteof Solid State PhysicsHefei Institutes of Physical Science(HFIPS)Chinese Academy of SciencesHefei 23031 Anhui China School of Materials Science and Engineering Anhui UniversityHefei 230601AnhuiChina

The in-situ generated oxyanions at electrochemically reconstructed catalysts from metal-based nonoxide compounds have been proven to significantly accelerate oxygen evolution reaction(OER)***,it remains a challenge to retain these self-released oxyanions at reconstructed catalysts,hindering its utilization as a tool to develop efficient OER ***,we demonstrate a versatile selftransformed carbonate regulation strategy to efficiently retain the self-released chalcogenate at Co oxyhydroxides reconstructed from carbon-incorporated Co selenides under OER *** selftransformed CO_(3)^(2-)can induce electron accumulation and narrow d bond at Co sites to facilitate the Co3d-O 2p orbital hybridization between Co sites and SeO_(x)^(2-)for enhanced SeO_(x)^(2-)retention,which can accelerate the rate-limiting step for^(*)OOH formation during *** to CoOOH-SeO_(x)^(2-)with limited SeO_(x)^(2-)residues,CoOOH-CO_(3)^(2-)/SeO_(x)^(2-)with elevated SeO_(x)^(2-)retention by CO_(3)^(2-)regulation exhibited a 5.6-fold increase in current density and a remarkable lower Tafel slope towards *** strategy paves a rational avenue to design efficient catalysts for electrooxidation reactions through finely regulating self-released oxyanions at reconstructed structures.

关键词： Electrochemical reconstruction Chalcogenate retention Carbonate regulation Orbital hybridization Oxygen evolution reaction

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Few-shot node classification via local adaptive discriminant structure learning

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Frontiers of Computer Science 2023年第2期17卷 135-143页

作者： zhe xue Junping DU Xin XU Xiangbin LIU Junfu WANG Feifei KOU Beijing Key Laboratory of Intelligent Telecommunication Software and Multimedia School of Computer ScienceBeijing University of Posts and TelecommunicationsBeijing 100876China

Node classification has a wide range of application scenarios such as citation analysis and social network *** many real-world attributed networks,a large portion of classes only contain limited labeled *** of the existing node classification methods cannot be used for few-shot node *** train the model effectively and improve the robustness and reliability of the model with scarce labeled samples,in this paper,we propose a local adaptive discriminant structure learning(LADSL)method for few-shot node *** aims to properly represent the nodes in the attributed graphs and learn a metric space with a strong discriminating power by reducing the intra-class variations and *** conducted on various attributed networks datasets demonstrate that LADSL is superior to the other methods on few-shot node classification task.

关键词： few-shot learning node classification graph neural network adaptive structure learning attention strategy

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Thermal expansion behavior of a β-LiAlSiO_4/Cu composite

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Rare Metals 2009年第1期28卷 82-85页

作者： WANG Lidong xue Zongwei LIU zhe FEI Weidong School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China

A copper matrix composite reinforced by β-LiAlSiO4 with negative thermal expansion coefficient was fabricated using vacuum hot-pressed sintering technique. The thermal expansion behavior of the composite was investigated, and the average residual stress in the matrix was analyzed by a simple model. The results indicate that the residual stress in the matrix affects the thermal expansion properties. After heat treatment, the coefficient of thermal expansion （CTE） of the composite decreases greatly. The CTE of the composite after thermal cycling between 50-350°C is the lowest.

关键词： copper matrix composite β-eucryptite thermal expansion residual stress

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Study of the structure and the mechanical properties of dynamically cured PP/MAH-g-SEBS/epoxy blends

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Chinese Chemical Letters 2009年第7期20卷 877-880页

作者： xue Liang Jiang yin Xi Zhang School of Materials Science and Engineering Wuhan Institute of Technology Wuhan 430073 China Research Institute of Polymer Materials S-hanghai Jiaotong University Shanghai 200030 China

A new method concerning with the simultaneous reinforcing and toughening of polypropylene （PP） was reported. Dynamical cure of the epoxy resin was successfully applied in the PP/maleic anhydride-grafted styrene-ethylene-butylene-styrene （SEBS） triblock copolymer, and the obtained blends named as dynamically cured PP/MAH-g-SEBS/epoxy blends. The stiffness and toughness of the blends are in a good balance, and MAH-g-SEBS was acted as not only an impact modifier but also a compatibilizer. The structure of the dynamically cured PP/MAH-g-SEBS/epoxy blends is the embedding of the epoxy particles by the MAH-g- SEBS.C2009 xue Liang Jiang. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： Dynamical cure Epoxy resin PP MAH-g-SEBS

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基于脑心轴探讨心血管疾病诊疗的新路径

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中国心血管杂志 2025年第1期30卷 4-8页

作者：李振兴尹奎英于雪季福绥中国人民解放军东部战区总医院神经外科南京210002 南京电子技术研究所 210039 北京医院心内科国家老年医学中心中国医学科学院老年医学研究院100730

心血管疾病是威胁我国居民健康的首要原因,具有发病率高、死亡率高的特点。随着基础医学和临床研究的发展,高血压、冠心病、心律失常和心力衰竭等心血管疾病得到了一定程度的预防和控制。然而,目前仍然有很多患者在接受改善生活方式、... 详细信息

心血管疾病是威胁我国居民健康的首要原因,具有发病率高、死亡率高的特点。随着基础医学和临床研究的发展,高血压、冠心病、心律失常和心力衰竭等心血管疾病得到了一定程度的预防和控制。然而,目前仍然有很多患者在接受改善生活方式、药物、血运重建等规范治疗后,症状反复发作,并发症发生率高,严重影响生活质量。因此,迫切需要寻找心血管疾病诊疗的新技术和新方法。近年来,中枢神经和外周脏器之间的生理学交互引发人们的关注,围绕脑心轴的研究更是逐渐成为国内外研究的热点,本文将围绕脑心轴的研究进展以及与心血管疾病的关系作一论述。

关键词：脑心轴自主神经系统大脑心血管疾病

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建筑工程标准规范智能解译关键技术及应用

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工程力学 2025年第2期42卷 1-14页

作者：林佳瑞陈柯吟郑哲周育丞陆新征清华大学土木工程系北京100084 住房城乡建设部数字建造与孪生重点实验室北京100084

建筑工程标准规范文本具有概念多样、隐含工程常识及复杂规则组合等特点,给标准规范的自动拆解与推理带来了极大挑战。因此,作者团队建立了一套集成领域大语言模型与常识知识图谱的规范智能解译技术体系。通过构建领域规范语料库及预训... 详细信息

建筑工程标准规范文本具有概念多样、隐含工程常识及复杂规则组合等特点,给标准规范的自动拆解与推理带来了极大挑战。因此,作者团队建立了一套集成领域大语言模型与常识知识图谱的规范智能解译技术体系。通过构建领域规范语料库及预训练大模型,实现规范内容文风语法等知识的学习表征,并通过大规模领域常识图谱构建,为规范条文智能解译奠定基础。基于领域大模型与大规模常识图谱,研发标准规范章节结构拆解、可解译条文识别、条文语义标注、句法解析以及复杂规则处理等核心算法与技术,实现了从原始文本到计算机可执行代码的端到端自动生成。作者团队还探讨了所提出的技术体系在条文关联检索、标准知识问答、BIM智能校审和BIM优化建议等典型场景中的应用潜力。验证结果表明:所提出的方法可有效突破复杂条文解译的瓶颈难题,条文解译准确率超过95%,解译效率较人工提升5倍,BIM模型审查效率提升约40倍,为建筑工程领域的标准规范的数字化及智能化应用提供了一条可借鉴、可推广的技术路径。

关键词：智能标准标准数字化规则解译大语言模型知识图谱智能审图

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