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Bilayer carbon-based structure with the promotion of homogenous nucleation for lithium metal anodes

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Science China(Technological Sciences) 2022年第7期65卷 1558-1566页

作者： SHAO YeQing XIE YongHui YANG Yang CAO JiaQi LI XiuWan LI wangyang ZHANG QiaoLi CHENG ShouLin CHENG ShuYing WANG XingHui College of Physics and Information Engineering Institute of Micro-Nano Devices and Solar CellsFuzhou UniversityFuzhou 350108China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China Fujian Provincial Key Laboratory of Light Propagation and Transformation College of Information Science and EngineeringHuaqiao UniversityXiamen 361000China Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou 213000China Fujian Key Laboratory of Electrochemical Energy Storage Materials Fuzhou UniversityFuzhou 350002China

Lithium metal anodes (LMAs) are considered as the promising alternatives for next-generation high energy density batteries,but are still hampered by the severe growth of uncontrollable lithium *** growth of lithium dendrites induces poor cycling lifespan and serious safety concerns,dragging lithium metal batteries out of practical *** designed a bilayer carbonbased structure covered with Co/C nanosheets and vertical graphene sheets (VGS).The enormous specific surface area and uniformly distributed Co nanoparticles of the CC@Co/C-VGS host are derived from its unique design,which can reduce local current density and nucleation overpotential,resulting in a dendrite-free morphology and exceptional cycling *** cells exhibit over 400 cycles (800 h) at a high current density/capacity of 10 mA cm^(-2)/10 mA h cm^(-2).Full cells using LiFePO_(4)as the cathode have an enhanced rate capability and a prolonged lifespan,reaching 90 mA h g^(-1)after 1000 cycles at 2 C with 73.5% capacity *** unique design sheds light on developing high-performance LMAs.

关键词： lithiophilic material bilayer carbon structure graphene MOF lithium metal anode

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Low-dimensional nanomaterial/Si heterostructure-based photodetectors

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InfoMat 2019年第2期1卷 140-163页

作者： Wei Tian Haoxuan Sun Liang Chen Peihua wangyang Xinrui Chen Jie Xiong Liang Li School of Physical Science and Technology Center for Energy Conversion Materials&Physics(CECMP)Soochow UniversitySuzhouChina State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengduChina

Due to its excellent electrical and optical features,silicon(Si)is highly attractive for photodetector *** design and fabrication of low-dimensional semiconductor/Si hybrid heterostructures provide a great platform for fabricating high-performance photodetectors,thereby overcoming the inherent limitations of *** review focuses on state-of-the-art Si heterostructure-based *** starts with the introduction of three different device configurations,that is,photoconductors,photodiodes,and *** working mechanisms and relative pros and cons are introduced,and the figures of merit of photodetectors are ***,we discuss the device physics/design,photodetection performance,and optimization strategies for Si-based ***,future challenges in the photodetector applications of Si-based hybrid heterostructures are discussed.

关键词： heterostructure nanomaterials photodetector Si

Species-specific and generalized allometric biomass models for eight Fagaceae species in the understory of evergreen broadleaved forests in subtropical China

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Journal of Forestry Research 2024年第4期35卷 156-170页

作者： Shengwang meng Qianyanzhou Ecological Research Station Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101People’s Republic of China

Quantifying the biomass of saplings in the regeneration component is critical for understanding biogeochemical processes of forest ***,accurate allometric equations have yet to be developed in sufficient *** develop species-specific and generalized allometric equations,154 saplings of eight Fagaceae tree species in subtropical China’s evergreen broadleaved forests were *** dendrometric variables,root collar diameter(d),height(h),and crown area(ca)were applied in the model by the weighted nonlinear seemingly unrelated regression *** only d as an input variable,the species-specific and generalized allometric equations estimated the aboveground biomass reasonably,with R _(adj)^(2) values generally>*** h and/or ca improved the fitting of some biomass components to a certain *** equations showed a relatively large coefficient of variation but comparable bias to species-specific *** in the absence of species-specific equations at a given location are generalized equations for mixed species *** developed regression equations can be used to accurately calculate the aboveground biomass of understory Fagaceae regeneration trees in China’s subtropical evergreen broadleaved forests.

关键词： Allometry Aboveground biomass Additivity Regeneration Subtropical China

De Lellis-Topping type inequalities on smooth metric measure spaces

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Frontiers of Mathematics in China 2018年第1期13卷 147-160页

作者： meng meng Shijin ZHANG School of Mathematics and Systems Science Beihang University Beijing 100191 China

We obtain some De Lellis-Topping type inequalities on the smootla metric measure spaces, some of them are as generalization of De Lellis-Topping type inequality that was proved by X. Cheng [Ann. Global Anal. Geom., 20... 详细信息

关键词： De Lellis-Topping type inequality Bakry-Emery Ricci curvature,smooth metric measure space

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从五大臣出洋看晚清小说中的“西游”想象

南都学坛 2025年第1期45卷 55-61页

作者：许萌李忠南阳师范学院文学院河南南阳473061 洛阳师范学院文学院河南洛阳471000

1906年至1911年间,晚清小说家对五大臣几乎清一色地作西游化、妖魔化等艺术处理,这是公使形象书写史上的别样呈现。晚清小说对五大臣形象的刻画,妙趣横生且极具寓言化特色,整体追求内在的“荒诞”与“怪、奇、丑”等审美观念,这与立宪... 详细信息

1906年至1911年间,晚清小说家对五大臣几乎清一色地作西游化、妖魔化等艺术处理,这是公使形象书写史上的别样呈现。晚清小说对五大臣形象的刻画,妙趣横生且极具寓言化特色,整体追求内在的“荒诞”与“怪、奇、丑”等审美观念,这与立宪幻梦破灭后形成的巨大落差不无关系。小说家普遍对之进行充满丑恶的描写并非偶然,正反映了彼时国民迫切打破封建专制束缚的心声。深究五大臣被晚清小说家塑造为“跳梁丑角”,乃至不断被妖魔化的成因,不仅在于日益高涨的革命风潮及其不可逆转的历史趋向,也在于报刊媒介对其的持续关注与负面报道。五大臣的文学形象丰富了中国近代文学小说人物的多元构成,也是百余年来我们探寻民族复兴之路的一个缩影,彰显了中国人走向现代化的曲折历程。

关键词：清末立宪运动考察宪政五大臣 “西游”叙事革命风潮报刊媒介

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基于多关系图注意力网络的社交机器人检测

计算机科学 2025年第1期52卷 298-306页

作者：孟令君陈鸿昶王庚润郑州大学网络空间安全学院郑州450003 信息工程大学国家数字交换系统工程技术研究中心郑州450003

现阶段社交机器人已经广泛存在于社交平台,社交机器人的存在使得网络上的舆论环境可以被人为操纵,这样不仅损害了绿色和谐的网络环境,同时也导致人们正常的网络生活受到极大影响。现有的检测方法可以分为基于特征、基于文本和基于图的方... 详细信息

现阶段社交机器人已经广泛存在于社交平台,社交机器人的存在使得网络上的舆论环境可以被人为操纵,这样不仅损害了绿色和谐的网络环境,同时也导致人们正常的网络生活受到极大影响。现有的检测方法可以分为基于特征、基于文本和基于图的方法,其中基于图数据的检测方法大多忽略了图中关系的异质性,并且由于图神经网络存在过渡平滑现象而不能进行深度检测。针对这一问题,提出基于多关系图注意力网络的社交机器人检测方法,在训练时首先将不同关系下的子图抽取出来,然后对子图中的节点采用注意力机制进行聚合,在不同关系下进行节点表示学习并得到节点表示,最后利用通道注意力融合不同关系下的同一节点得到节点表示;同时采用基于LSTM注意力的后连接操作让节点可以自适应地选择邻域进行聚合,以此来缓解过度平滑现象。在Cresci15,Twibot20和MGTAB这3个数据集上的实验结果表明,与11个模型中评价指标的最优值相比,该模型的准确率分别提升了0.47%,1.19%和0.38%,验证了多关系图注意力网络进行社交机器人检测的有效性。

关键词：异质图图注意力节点表示学习 LSTM注意力社交机器人

Realizing high thermoelectric performance for p-type SiGe in medium temperature region via TaC compositing

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Journal of Materiomics 2023年第5期9卷 984-991页

作者： Zheng Fan JiSheng Liang Jun-Liang Chen Ying Peng Huajun Lai Jian Nong Chengyan Liu wangyang Ding Lei Miao Guangxi Key Laboratory for Relativity Astrophysics State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite StructuresSchool of Physical Science and TechnologyGuangxi UniversityNanning530004China Engineering Research Center of Electronic Information Materials and Devices Ministry of EducationGuangxi Key Laboratory of Information MaterialGuilin University of Electronic TechnologyGuilin541004China Guangxi Key Laboratory of Precision Navigation Technology and Application Guilin University of Electronic TechnologyGuilin541004China Guangxi Academy of Sciences Nanning530007China

SiGe is recognised as an excellent thermoelectric material with superior mechanical properties and thermal stability in regions with high *** study explores a novel strategy for coregulating thermoelectric transport parameters to achieve high thermoelectric properties of p-type SiGe in the mid-temperature region by incorporating nano-TaC into SiGe combined ball milling with spark plasma *** optimizing the amount of TaC in the SiGe matrix,the power factors were significantly increased due to the modulation doping effect based on the work function matching of SiGe with ***,the ensemble effect of the nanostructure leads to a significant decrease in thermal ***,a high ZT of 1.06 was accomplished at 873 K,which is 64%higher than that of typical radioisotope thermoelectric *** research offers a novel strategy for expanding and enhancing the thermoelectric properties of SiGe materials in the medium temperature range.

关键词： SiGe Thermoelectric Work function matching Modulation doping effect Phonon scattering

Characterizations on the instantaneously formed Ni-containing intermetallics in magnesium alloys

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Journal of Magnesium and Alloys 2023年第8期11卷 2991-2998页

作者： Shuhui Lv Qiang Yang Fanzhi meng Jian meng School of Materials Science and Engineering Changchun University of Science and Technology 130022PR China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022PR China

Instantaneous reactions of Al,Mn,Zn,Zr and Y with Ni by mixing the prepared Mg-8Al-0.4Mn,Mg-6Zn-2Y-0.5Zr and Mg-0.6Ni melts were investigated in this work to reveal the underlying mechanisms of their effects on the removal of Ni *** results indicate three Ni-containing intermetallics,namely Al_(4)NiY,Al_(4)Ni(Y,Zr)and Al_(31)Ni_(2)Mn_(6).The former two phases present lath-like and have a relatively larger size(>20μm in length)than the latest one which is granular with the diameter of∼120 *** illustrates that Al and Y(/Zr)can efficiently remove Ni by forming Al_(4)NiY or Al_(4)Ni(Y,Zr)which would precipitate to the bottom of the ***,adding Y into Mg-Al based alloys can simultaneously remove Fe and Ni,which contributes their excellent corrosion ***,this paper proposes two methods helped to efficiently remove Ni for both Mg-Al based alloys and Al-free Mg alloys,and both of them are also benefit to improve alloys’strength.

关键词： Magnesium alloys Intermetallics Nickel Transmission electron microscopy(TEM) Impurity

A compressing and saving method for structured grid data based on block construction

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Chinese Journal of Aeronautics 2022年第6期35卷 146-155页

作者： Yan SUN Ying ZHAO Dehong meng meng JIANG State Key Laboratory of Aerodynamics China Aerodynamics Research and Development CenterMianyang 621000China Computational Aerodynamics Institute China Aerodynamics Research and Development CenterMianyang 621000China

The increasing grid data in CFD simulation has brought some new difficulties and challenges,such as high storage cost,low transmission *** order to overcome these problems,a novel method for compressing and saving the structured grid are *** the present method,the geometric coordinates of the six logical domains of one grid block is saved instead of all grid vertex coordinates to reduce the size of the structured grid file when the grid is *** all grid vertex coordinates are recovered from the compressed data with the use of the transfinite interpolation algorithm when the grid is ***,single-block grid cases with different edge vertexes are tested to investigate the compression *** test results show that a higher compression ratio will be obtained on a larger ***,further theoretical analysis is carried out to investigate the effects of parameters on grid *** analysis on single-block grid compression shows that the compression ratio is proportionate to the cubic root of the number of total *** highest compression ratio of single-block grid is obtained when the numbers of vertexes in three logical directions are *** analysis on multi-block grid compression shows that a higher compression ratio will be obtained when a larger difference of total vertexes number exists among the grid ***,multi-blockgrids of two industrial aircraft configurations are compressed to validate the *** compression results demonstrate that the present method has an excellent ability on structured grid *** a million-vertex structured grid,more than 80 percent disk space can be saved after compression.

关键词： CFD Compression Compression ratio Structured grid Transfinite interpolation