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Chinese Science Bulletin 2013年第14期58卷 1632-1641页

作者： chen XiaoBo chen Zhenlian li Jun Ningbo Institute of Material Technology & Engineering Chinese Academy of Sciences

We report on first-principles studies of lithium-intercalation-induced structural phase transitions in molybdenum disulphide (MoS2 ), a promising material for energy storage in lithium ion batteries. It is demonstrated that the inversion-symmetry-related Mo-S p-d covalence interaction and the anisotropy of d-band hybridization are the critical factors influencing the structural phase transitions upon li ion intercalation. li ion intercalation in 2H-MoS2 leads to two competing effects, i.e. the 2H-to-1T transition due to the weakening of Mo-S p-d interaction and the D 6h crystal field, and the charge-density-wave transition due to the Peierls instability in li-intercalated 2H phase. The stabilization of charge density wave in li-intercalated MoS2 originates from the enhanced electron correlation due to nearest-neighbor Mo-Mo d-d covalence interaction, conforming to the extended Hubbard model. The magnitude of charge density wave is affected by Mo-S p-d covalence interaction and the anisotropy of d-band hybridization. In 1T phase of li-intercalated MoS2 , the strong anisotropy of d-band hybridization contributes to the strong Fermi surface nesting while the d-band nonbonding with S-p facilities effective electron injection.

关键词：锂离子电池二硫化钼结构相变电子控制 Hubbard模型电荷密度波诱导各向异性

Dielectronic Recombination on He+ with Non-isolated Resonance Approach

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Chinese Physics Letters 2000年第2期17卷 96-98页

作者： ZOU yu ZHAO li-Bo FANG quan-yu Institute of Applied Physics and Computational Mathematics Beijing 100088 Department of Applied Physics Beijing University of Aeronautics and AstronauticsBeijing 100083

Based on the relativistic multichannel theory, a non-isolated resonance approach has been developed to calculate the cross sections of dielectronic recombination on He+ for △n=1 and 2 transitions. A first order approximation is adopted for the radiative process. The convolved cross sections for the n≤3 states in both transitions are in good agreement with those of the observations. It is shown that the l-dependence of the field ionization and the radiative decay during the time-of-flight affect significantly the measurement of the cross sections near the initial state of the field ionization.

关键词： process transitions radiative

A maize bundle sheath defective mutation mapped on chromosome 1 between SSR markers umc1395 and umc1603

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Journal of Integrative Agriculture 2015年第10期14卷 1949-1957页

作者： PAN yu chen Xu-qing XIE Hua DENG Lei li Xiang-long ZHANG Xiao-dong HAN li-xin YANG Feng-ping XUE Jing ZHANG li-quan Beijing Agro-Biotechnology Research Center Beijing Academy of Agricultural and Forestry Science Key Laboratory of Horticulture Science for Southern Mountainous Regions Ministry of Education/College of Horticulture and Landscape Architecture Southwest University Bioengineering College Chongqing University

The bsd-pg（bundle sheath defective pale green） mutant is a novel maize mutation, controlled by a single recessive gene, which was isolated from offspring of maize plantlets regenerated from tissue callus of the maize inbred line 501. The characterization was that the biogenesis and development of the chloroplasts was mainly interfered in bundle sheath cells rather than in mesophyll cells. For mapping the bsd-pg, an F2 population was derived from a cross between the mutant bsd-pg and an inbred line Xianzao 17. Using specific locus amplified fragment sequencing（SLAF-Seq） technology, a total of 5 783 polymorphic SLAFs were analysed with 1 771 homozygous alleles between maternal and paternal parents. There were 49 SLAFs, which had a ratio of paternal to maternal alleles of 2：1 in bulked normal lines, and three trait-related candidate regions were obtained on chromosome 1 with a size of 3.945 Mb. For the fine mapping, new simple sequence repeats（SSRs） markers were designed by utilizing information of the B73 genome and the candidate regions were localized a size of 850 934 bp on chromosome 1 between umc1603 and umc1395, including 35 candidate genes. These results provide a foundation for the cloning of bsd-pg by map-based strategy, which is essential for revealing the functional differentiation and coordination of the two cell types, and helps to elucidate a comprehensive understanding of the C4 photosynthesis pathway and related processes in maize leaves.

关键词： maize bsd-pg SLAF SSR assossiation analysis fine mapping

Lower Exciton Number Strong light Matter Interaction in Plasmonic Tweezers

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Chinese Physics Letters 2021年第2期38卷 18-21页

作者： yun-Fei Zou li yu School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China

The plasmonic nanocavity is an excellent platform for the study of light matter interaction within a sub-diffraction volume under ambient *** design a structure of plasmonic tweezers,which can trap molecular Jaggregates and also serve as a plasmonic cavity with which to investigate strong light matter *** optical response of the cavity is calculated via finite-difference time-domain methods,and the optical force is evaluated based on the Maxwell stress tensor *** the help of the coupled oscillator model and virtual exciton theory,we investigate the strong coupling progress at the lower level of excitons,finding that a Rabi splitting of 230 meV can be obtained in a single exciton *** further analyze the relationship between optical force and model volume in the coupling *** proposed method offers a way to locate molecular J-aggregates in plasmonic tweezers for investigating optical force performance and strong light matter interaction.

关键词： interaction. method. coupling

Isothianaphthene diimide: an air-stable n-type semiconductor

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Science China Chemistry 2019年第10期62卷 1360-1364页

作者： Xiaolong chen Yaowu He Muhammad Umair Ali yu He Yanan Zhu Aiyuan li Changbin Zhao Igor FPerepichka Hong Meng School of Advanced Materials Peking University Shenzhen Graduated SchoolShenzhen 518055China Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing 100871China Shaanxi Institute of Flexible Electronics Northwestern Polytechnical UniversityXi’an 710072China

Herein,we propose a new strategy to develop air-stable n-type organic semiconductors with non-classical thiophene aromatic diimide derivatives by replacing aromatic naphthalene with a heteroaromatic isothianaphthene *** designed and successfully synthesized the isothianaphthene core based diimide material,N,N′-bis(n-hexyl)isothianaphthene-2,3,6,7-tetracarboxylic acid diimide(BTDI-C6)as an n-type *** to N,N′-bis(n-hexyl)naphthalene-1,4,5,8-tetracarboxylic acid diimide(NDI-C6),BTDI-C6 possesses a deeper LUMO energy level of-4.21 eV,which is 0.32 eV lower than that of *** molecular modelling and experimental results elucidated that organic thin film transistors(OTFTs)based on both of these materials exhibit comparable mobilities;however,the threshold voltage of BTDI-C6 based device(+7.5 V)is significantly lower than that of NDI-C6 based counterpart(+34V).Moreover,the low-lying LUMO energy level of BTDI-C6 ensures excellent air-stability which is further validated by the device *** addition,BTDI-C6 shows high luminescence while NDI-C6 is not luminescent at all in solution,which reveals the potential application of our newly synthesized material in n-type light-emitting transistors.

关键词： isothianaphthene non-classical imide n-type

A study of boundary vorticity dynamics and identification of large-scale structures in flow field based on two-dimensional flow around a bluff body

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Journal of Hydrodynamics 2019年第2期31卷 231-248页

作者： Da-peng Zhang yu-zhu chen Xi-lin Xie Department of Aeronautics and Astronautics Fudan UniversityShanghai 200433China

A method based on decomposition of acceleration field and lie derivative is introduced to identify shearing and rotational *** method is validated on two typical kinds of model *** dynamics of flow around bluff body is studied,illustrated by numerical examples of flow around an elliptic cylinder,a slanted elliptic cylinder and an elliptic cylinder with a pair of bumps on the front *** explain the generation of vortical structures and how they evolve into inner flow field,boundary vorticity dynamics analysis is *** vorticity flux as well as the enstrophy diffusion flux creates vorticity sources and vorticity sinks,which generate or consume boundary vorticity,then shearing layers are generated and interact with each other finally create *** results provide potential in accurate flow control by boundary deformation,and show that relevant theoretical conclusions can be effectively applied in revealing the flow mechanisms.

关键词： Boundary vorticity dynamics large-scale structures lie derivative

On weakly S-embedded subgroups of finite groups

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Science China Mathematics 2011年第9期54卷 1899-1908页

作者： li JinBao chen Guiyun chen RuiFang School of Mathematics and Statistics Southwest University Chongqing 400715 China

Let H be a subgroup of a group G. Then H is said to be S-quasinormal in G if HP = PH for every Sylow subgroup P of G; H is said to be S-quasinormally embedded in G if a Sylow p-subgroup of H is also a Sylow p-subgroup of some S-quasinormal subgroup of G for each prime p dividing the order of H. In this paper, we say that H is weakly S-embedded in G if G has a normal subgroup T such that HT is an S-quasinormal subgroup of G and H VIT ≤ HSE, where HSE denotes the subgroup of H generated by all those subgroups of H which are S-quasinormally embedded in G. Some results about the influence of weakly S-embedded subgroups on the structure of finite groups are given.

关键词： finite groups weakly S-embedded subgroups the generalized Fitting subgroups supersolublegroups p-nilpotent groups

Observation of the density dependence of the closed-channel fraction of a 6li superfluid

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National Science Review 2022年第10期9卷 105-111页

作者： Xiang-Pei liu Xing-Can Yao Hao-Ze chen Xiao-Qiong Wang yu-Xuan Wang yu-Ao chen Qijin chen Kathryn Levin Jian-Wei Pan Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics University of Science and Technology of China Shanghai Branch CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Shanghai Research Center for Quantum Sciences James Franck Institute University of Chicago

Atomic Fermi gases provide an ideal platform for studying pairing and superfluid physics,using a Feshbach resonance between closed-channel molecular states and open-channel scattering *** particular interest is the strongly interacting *** show that the closed-channel fraction Zccprovides an effective probe for important many-body interacting effects,especially through its density dependence,which is absent from two-body theoretical *** we measure Zccas a function of interaction strength and the Fermi temperature TF in a trapped 6li superfluid throughout the entire Bardeen-Cooper-Schrieffer-Bose-Einstein-condensate crossover,in quantitative agreement with theory when important thermal contributions outside the superfluid core are taken into *** from the deep-BEC regime,the fraction Zccis sensitive to *** particular,our data show Zcc∝TFαwith α=1/2at unitarity,in quantitative agreement with calculations of a two-channel pairing fluctuation theory,and a increases rapidly into the BCS regime,reflecting many-body interaction effects as predicted.

关键词： closed-channel fraction density dependence strongly interacting Fermi gas many-body effect

Fermionized Dual Vortex Theory for Magnetized Kagom′e Spin liquid

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Chinese Physics Letters 2024年第11期41卷 202-207页

作者： Si-yu Pan Gang v.chen International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Collaborative Innovation Center of Quantum Matter Beijing 100871China

Inspired by the recent quantum oscillation measurement on the kagom′e lattice antiferromagnet in finite magnetic fields,we raise the question about the physical contents of the emergent fermions and the gauge fields if the U(1)spin liquid is relevant for the finite-field kagom′e lattice ***,the magnetic field is non-perturbative in this regime,and the finite-field state has no direct relation with the U(1)Dirac spin liquid proposal at zero *** here consider the fermionized dual vortex liquid state as one possible candidate theory to understand the magnetized kagom′e spin *** the dual vortex theory,the S^(z) magnetization is the emergent U(1)gauge flux,and the fermionized dual vortex is the emergent *** magnetic field polarizes the spin component that modulates the U(1)gauge flux for the fermionized vortices and generates the quantum *** the mean-field theory,we discuss the gauge field correlation,the vortex–antivortex continuum and the vortex thermal Hall effect.

关键词： oscillation. effect. field.

3D printing of architectured graphene-based aerogels by cross-linking GO inks with adjustable viscoelasticity for energy storage devices

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Rare Metals 2023年第3期42卷 971-981页

作者： San-Can Han Jia-Le Quan Fu-Guo Zhou yu-Hua Xue Na li Feng-yu li Ding Wang School of Materials Science and Engineering University of Shanghai for Science and TechnologyShanghai 200093China

Three-dimensional(3D)functional graphenebased architecture with superior electrical conductivity and good mechanical strength has promising applications in energy storage and ***-adjustable inks make it possible to achieve desired 3D architectures with interconnected and continuous interior networks by microextrusion *** this work,ultra-low-concentration graphene oxide(GO)inks of~15 mg·ml-1 have been obtained and demonstrated in direct 3D printing with a facile cross-linking(direct ink writing).The rheological behavior of the GO strategy by cations,which is the lowest concentration to achieve direct ink writing inks,could be adjusted from 1×10^(4) to 1×10^(5) Pa·s^(-1) with different concentrations of cations due to strong cross-linking networks between GO sheets and ***,the specific strength and electrical conductivity of 3D-printed graphene architecture are notably enhanced,reaching up to 51.7×10^(3) N·m·kg^(-1)and 119 S·m^(-1),which are superior to conventional graphene ***,3D printing graphene-based architecture assembled in micro-superc apacitor exhibits excellent electrochemical performance,which can be ascribed to the effective ion transportation through the interconnected *** strategy demonstrated is useful in the design of complex-shaped,graphene-based architectures for scalable manufacturing of practical energy storage applications.

关键词： Three-dimensional(3D)printing Graphene oxide(GO)inks Cross-linking strategy Graphene-based architecture