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The Fulde-Ferrell-Larkin-Ovchinnikov states in s and d-wave superconductor with spin-dependent bandwidth imbalance on square lattice

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Science China(Physics,Mechanics & Astronomy) 2016年第1期59卷 92-97页

作者： Yong-Hui Wang Qing-qiang meng Yan Chen Department of Physics and State Key Laboratory of Surface Physics Fudan UniversityShanghai 200433China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China

We study numerically the phase diagram for s and d-wave fermionic superftuidity/superconductivity with spin-dependent band- width imbalance on a two-dimensional square-lattice. We also investigate the spontaneous space symmetry breaking states at low temperatures by solving the Bogoliubov-de Gennes equations. It is found that, the spatial configuration of the order parameter, both the uni-directional Fulde-Ferrell-Larkin-Ovchinnikov （FFLO） states and the two-dimensional FFLO state may show up in the presence of finite spin-dependent bandwidth imbalance. Moreover, we calculate the spectra of local density of states, and the experimental proposals of observing such FFLO states are therefore suggested.

关键词： FFLO state superconductivity superfluidity

The roles of MXenes in developing advanced lithium metal anodes

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Journal of Energy Chemistry 2022年第6期31卷 132-149,I0005页

作者： Nicolas Lucero Dayannara Vilcarino Dibakar Datta meng-qiang Zhao Department of Chemical and Materials Engineering Newark College of EngineeringNew Jersey Institute of TechnologyNewarkNJ 07103USA Jose Marti Stem Academy Union CityNJ 07087USA Department of Mechanical and Industrial Engineering Newark College of EngineeringNew Jersey Institute of TechnologyNewarkNJ 07103USA

Lithium(Li) metal has emerged as the most promising anode for rechargeable Li batteries owing to its high theoretical specific capacities, low negative electrochemical potential, and superior electrical conductivity. Replacing the conventional graphite anodes with Li metal anodes(LMAs) provides great potential to exceed the theoretical limitations of current commercial Li-ion batteries, leading to nextgeneration high-energy–density rechargeable Li metal batteries(LMBs). However, further development of LMAs is hindered by several inherent issues, such as dangerous dendrite growth, infinite volume change, low Coulombic efficiency, and interfacial side reactions. MXenes, a family of two-dimensional(2 D) transition metal carbides and/or nitrides, have recently attracted much attention to address these issues due to their 2D structure, lithiophilic surface terminations, excellent electrical and ionic conductivity, and superior mechanical properties. Herein, an overview of recent advances in the roles of MXenes for stabilizing LMAs is presented. In particular, strategies of utilizing MXenes as the Li hosts, artificial protection layers, electrolyte additives, and for separator modifications to develop stable and dendrite-free LMAs are discussed. Moreover, a perspective on the current challenges and potential outlooks on MXenes for advanced LMAs is provided.

关键词： MXenes 2D materials Lithium dendrites Lithium metal anodes Stability

Devitrification of Al-Ce Amorphous Ribbon Investigated Using In situ High Energy X-ray Diffraction

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Acta Metallurgica Sinica(English Letters) 2022年第1期35卷 157-162页

作者： Ying-Xi Li Fan-qiang meng Rui Yuan Guo-qiang Huang Dong-Bai Sun Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai519082China School of Materials Science and Engineering Sun Yat-Sen UniversityGuangzhou510275China

Metastable phases formed during vitrification or devitrification open an avenue to study the intrinsic structural hierarchy in amorphous *** phase transformation sequence of Al89Ce11 amorphous ribbon was investigated using diff erential scanning calorimetry,in situ high energy X-ray diffraction(HEXRD)and ex situ high-resolution scanning transmission electron *** results reveal the devitrification pathway following the reaction:amorphous→ε-Al_(60)Ce_(11)+fcc-Al→η-Al_(41)Ce_(5)+fcc-Al→Al_(11)Ce_(3)+*** has been found that bothε-Al_(60)Ce_(11)andη-Al_(41)Ce_(5)metastable phases have same Ce-centered 1-6-6-6-1 motif,suggesting that the structural motif can be *** of metastable phase with large unit cell is related to the short-range orders developed during *** heredity provides a new method to tailor the microstructure and properties of Al-based alloys based on genetic mechanism.

关键词： Synchrotron radiation Amorphous alloys Crystallization Phase transformation

Effect of Substrate Bias on Microstructure and Properties of Tetrahedral Amorphous Carbon Films

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Journal of Materials Science & Technology 2003年第z1期19卷 109-111页

作者： Jiaqi ZHU Jiecai HAN Songhe meng qiang LI Manlin TAN Center of Composite Materials Harbin Institute of Technology Harbin 150001 China Center of Composite Materials Harbin Institute of Technology Harbin 150001 China Center of Composite Materials Harbin Institute of Technology Harbin 150001 China Center of Composite Materials Harbin Institute of Technology Harbin 150001 China Center of Composite Materials Harbin Institute of Technology Harbin 150001 China

The microstructure and properties of tetrahedral amorphous carbon (ta-C) films deposited by the filtered cathodic vacuum arc technology has been investigated by visible Raman spectroscopy, AFM and Nano-indentor. The Raman spectra have been fitted with a single skewed Lorentzian lineshape described by BWF function defining coupling coefficient, which characterizes the degree of asymmetry and is correlated with the sp3 content. When the substrate bias is -80 V, the sp3 content is the most and simultaneously the coupling coefficient is the least, following with the minimum root mean square surface roughness (Rq=0.23 nm) and the highest hardness (51.49 GPa), Young′s modulus (512.39 GPa), and critical scratching load (11.72 mN). As the substrate bias is increased or decreased, the sp3 content and other properties lower correspondingly.

关键词： Tetrahedral amorphous carbon, Filtered cathodic vacuum arc, Substrate bias

The mechanisms of thermal solidification agent promoting steam diversion in heavy oil reservoirs

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Petroleum Science 2024年第3期21卷 1902-1914页

作者： Zhan-Xi Pang Qian-Hui Wang qiang meng Bo Wang Dong Liu State Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing102249China Liaohe Oilfield Institute CNPC ChinaPanjin124000LiaoningChina Henan Oilfield Institute Sinopec ChinaNanyang473400HenanChina Tianjin Branch of China National Offshore Oil Company(CNOOC)Ltd. Tianjin300452China

At high cycles of steam huff&puff,oil distribution in reservoirs becomes stronger heterogeneity due to steam *** solidification agent can be used to solve this *** solution is a lowviscosity liquid at normal temperature,but it can be solidified above 80℃.The plugging degree is up to 99%at 250℃.The sweep efficiency reaches 59.2%,which is 7.3%higher than pure steam *** addition,simultaneous injection of viscosity reducer and/or nitrogen foams can further enhance oil *** mechanism of this technology depends on its strong plugging ability,which changes the flowing pattern of steam to effectively mobilize remaining *** reducer and nitrogen foams further expand the sweep range and extends the effective ***,thermal solidification agent can plug steam channeling paths and adjust steam flowing direction to significantly enhance oil recovery at high cycles of steam huff&puff.

关键词： Heavy oil reservoir Steam huff&puff Steam channeling Steam diversion Plugging performance Mechanism analysis

Numerical and theoretical analysis on soil arching effect of prefabricated piles as deep foundation pit supports

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Underground Space 2024年第3期16卷 314-330页

作者： Qianwei Xu Jinli Xie Linhai Lu Yongji Wang Chaojun Wu qiang meng Key Laboratory of Road and Traffic Engineering Ministry of EducationTongji UniversityShanghai 201804China Jinan Rail Transit Group Co. LtdJinan 250101China Guangxi Nanning Airport Comprehensive Transportation Hub Construction Co. Ltd.Nanning 530048China

This study presents a detailed investigation into the soil arching effects within deep foundation pits(DFPs),focusing on their mechanical behavior and implications for structural *** rigorous 3D finite element modeling and parameter sensitivity analyses,the research explores the formation,geometric characteristics,and spatial distribution of soil arching *** investigation encompasses the influence of key parameters such as elastic modulus,cohesion,and internal friction angle on the soil arching *** findings reveal that soil arching within DFPs exhibits distinct spatial characteristics,with the prominent arch axis shifting as excavation depth *** soil arching is observed when the pile spacing approximates three times the pile diameter,enhancing soil retention and minimizing deformation *** analyses highlight the significant impact of soil parameters on soil arching behavior,underscoring the critical role of cohesive forces and internal friction angles in shaping arching *** elucidating the interplay between soil parameters and soil arching effects,the research provides insights for optimizing pile spacing and structural stability.

关键词： Soil arching effect Numerical analysis Foundation pit support Pile spacing

A Review of Advanced Energy Materials for Magnesium–Sulfur Batteries

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Energy & Environmental Materials 2018年第3期1卷 100-112页

作者： Long Kong Chong Yan Jia-Qi Huang meng-qiang Zhao Maria-Magdalena Titirici Rong Xiang qiang Zhang Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China Department of Physics and Astronomy University of Pennsylvania209 South33rd StreetPhiladelphia PA 19104USA School of Engineering and Materials Science Queen Mary University of LondonMile End RoadE14NSLondon UK Department of Mechanical Engineering The University of TokyoTokyo 113-8656Japan

Magnesium–sulfur batteries promise high volumetric energy density,enhanced safety,and low cost for electrochemical energy *** current obstacles to practical applications of reliable magnesium–sulfur batteries are finding electrolytes that can meet a multitude of rigorous requirements along with efficient sulfur cathodes and magnesium *** review highlights recent advances in designing better electrolytes,cathodes,and anodes.A suitable electrolyte for magnesium-sulfur batteries should allow to reversibly electroplate/strip divalent magnesium ions and should be compatible with the sulfur cathode and the other cell’s components.

关键词： electrolyte energymaterials magnesiumanode magnesium-sulfur batteries sulfur cathode

Identifying Three New AGNs among Fermi Unidentified Gigaelectronvolt Sources

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Research in Astronomy and Astrophysics 2024年第7期24卷 257-267页

作者： Shun-Hao Ji Zhong-Xiang Wang qiang-meng Huang Ruo-Heng Yang Department of Astronomy School of Physics and AstronomyYunnan UniversityKunming 650091China Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China

We report our identification of three gigaelectronvoltγ-ray sources,4FGL J0502.6+0036,4FGL J1055.9+6507,and 4FGL J1708.2+5519,as Active Galactic Nuclei(AGNs).They are listed in the latest Fermi-Large Area Telescope source catalog as unidentified *** find that the sources all showedγ-ray flux variations in recent *** different survey catalogs,we are able to find a radio source within the error circle of each source's *** analysis of optical sources in the fields allows us to determine the optical counterparts,which showed similar variation patterns to those seen inγ-*** optical counterparts have reported redshifts of 0.6,1.5,and 2.3,respectively,estimated from photometric *** addition,we also obtain an X-ray spectrum of 4FGL J0502.6+0036 and a flux upper limit on the X-ray emission of 4FGL J1055.9+6507 by analyzing the archival *** broadband spectral energy distributions of the three sources from radio toγ-rays are *** mainly theγ-ray properties of the three sources with those of different sub-classes of AGNs,we tentatively identify them as *** optical spectroscopy is highly warranted for obtaining their spectral features and thus verifying the identification.

关键词： gamma-rays galaxies-(galaxies)BL Lacertae objects general-(galaxies)quasars general

Evolution behavior of γ″ phase of IN718 superalloy in temperature/stress coupled field

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International Journal of Minerals,Metallurgy and Materials 2021年第12期28卷 1949-1956页

作者： Han-zhong Deng Lei Wang Yang Liu Xiu Song Fan-qiang meng Shuo Huang Key Lab for Anisotropy and Texture of Materials Ministry of EducationNortheastern UniversityShenyang 110819China College of Materials Science and Engineering Liaoning Technical UniversityFuxin 123000China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai 519000China High Temperature Materials Research Division Central Iron&Steel Research InstituteBeijing 100081China

The evolution behavior of theγ″phase of IN718 superalloy in a temperature/stress coupled field was *** showed that the coarsening rate of theγ″phase was significantly accelerated in the temperature/stress coupled *** on the detail microstructural and crystal defect analysis,it was found that the coarsening rate of theγ″phase with applied stress was significantly higher than that without *** main reasons for the increase in the coarsening rate of theγ″phase are as follows:the vacancy formation energy is decreased by the applied stress,which leads to an increase in the vacancy concentration;in the temperature/stress coupled field,the Nb atoms easily combine with vacancies to form complexes and diffuse with the complexes,resulting in a significant increase in the Nb atom diffusion coefficient;Nb atom diffusion is the key control factor for the coarsening of theγ″phase.

关键词： IN718 stress superalloy