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“Zero‑Strain” NiNb_(2)O_(6) Fibers for All‑Climate Lithium Storage

Nano-Micro Letters 2025年第1期17卷 348-360页

作者： Yan Zhao Qiang Yuan Liting Yang guisheng Liang yifeng che.g Limin Wu Chunfu Lin Renchao che College of Physics Donghua UniversityShanghai 201620People’s Republic of China School of Materials Science and Engineering Institute of Materials for Energy and EnvironmentQingdao UniversityQingdao 266071People’s Republic of China Laboratory of Advanced Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsAcademy for Engineering&TechnologyFudan UniversityShanghai 200438People’s Republic of China Zhejiang Laboratory Hangzhou 311100People’s Republic of China Inner Mongolia University Hohhot 010021People’s Republic of China

Niobates are promising all-climate Li^(+)-storage anode material due to their fast charge transport,large specific capacities,and resistance to electrolyte ***,their moderate unit-cellvolume expansion(generally 5%–10%)during Li^(+)storage causes unsatisfactory long-term ***,“zero-strain”NiNb_(2)O_(6) fibers are explored as a new anode material with comprehensively good electrochemical *** Li^(+)storage,the expansion of electrochemical inactive NiO_(6) octahedra almost fully offsets the shrinkage of active NbO_(6) octahedra through reversible O *** superior volume-accommodation capability of the NiO_(6) layers guarantees the“zero-strain”behavior of NiNb_(2)O_(6) in a broad temperature range(0.53%//0.51%//0.74%at 25//−10//60℃),leading to the excellent cyclability of the NiNb_(2)O_(6) fibers(92.8%//99.2%//91.1%capacity retention after 1000//2000//1000 cycles at 10C and 25//−10//60℃).This NiNb_(2)O_(6) material further exhibits a large reversible capacity(300//184//318 mAh g−1 at 0.1C and 25//−10//60℃)and outstanding rate performance(10 to 0.5C capacity percentage of 64.3%//50.0%//65.4%at 25//−10//60℃).Therefore,the NiNb_(2)O_(6) fibers are especially suitable for large-capacity,fast-charging,long-life,and all-climate lithium-ion batteries.

关键词： NiNb_(2)O_(6)porous fiber “Zero-strain”mechanism Electrochemical property Harsh-temperature operation Operando characterization

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Revealing and predicting the long-term biomechanical response of orthokeratology by developing a patient-specific computational model

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 156-168页

作者： yifeng Li Zhuoran Yang Ziming Yan Huibin Shi Zhanli Liu Kaijie Wang Department of Engineering Mechanics School of Aerospace Engineering Tsinghua University Beijing Tongren Eye Center Beijing Tongren Hospital Capital Medical University Beijing Ophthalmology & Visual Sciences Key Lab

Orthokeratology(OK) is widely used for effective myopia correction and control. However, the incomplete understanding of its biomechanical mechanisms makes OK lens fitting rely heavily on clinician judgment, complicating accurate predictions of treatment outcomes. In this paper, we performed clinical experiments and numerical analysis to study corneal deformation modes and long-term changes in central corneal thickness. Clinical experiments were conducted on 194 Chinese myopic patients under OK treatment for 3 months. Based on the experimental data, a patient-specific computational biomechanical model for OK was established and validated. Specifically, the anisotropic mechanical properties of the cornea were incorporated into the model to describe the significant difference between its shear modulus(29.5 kPa) and tensile modulus(768.4 kPa). Additionally, a viscohyperelastic material model with a prolonged corneal relaxation time of 5.6 h was developed to capture the long-term deformation response. The results show that corneal thickness reduction in OK is primarily due to out-of-plane shear deformation,influenced by the cornea's low shear resistance. Modeling the extended corneal relaxation time is crucial for predicting long-term biomechanical responses. The computational model effectively captures long-term changes in central corneal thickness, potentially improving OK lens fitting accuracy.

关键词： orthokeratology computational biomechanical model long-term viscoelasticity myopia correction

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Effect of Porosity and Cell Size on the Dynamic Compressive Properties of Aluminum Alloy Foams

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Journal of Materials Science & Technology 2002年第5期18卷 395-397页

作者： yifeng ShishengHU 等 aboratoryofInternalFrictionandDefectsinSolids InstituteofSolidStatePhysicsChineseAcademyofSciencesHefei230031China DepartmentofMechanicsandEngineering UniversityofScienceand

The dynamic mechanical properties of open-cell aluminum alloy foams with different relative densities and cell sizes have been investigated by compressive tests. The strain rates varied from 700 s-1 to 2600 s-1. The experimental results showed that the dynamic compressive stress-strain curves exhibited a typical three-stage behavior: elastic, plateau and densification. The dynamic compressive strength of foams is affected not only by the relative density but also by the strain rate and cell size. Aluminum alloy foams with higher relative density or smaller cell size are more sensitive to the strain rate than foams with lower relative density or larger cell size.

关键词： Aluminum alloy Porosity Dynamic compressive property Foam

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Realizing optimized interfacial polarization and impedance matching with CNT-confined Co nanoparticles in hollow carbon microspheres for enhanced microwave absorption

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Journal of Materials Science & Technology 2024年第8期175卷 1-9页

作者： Chang Zhang Kaiche.g Luo Jiwei Liu Huibin Zhang Chunyang Xu Ruixuan Zhang yifeng che.g Jincang Zhang Limin Wu Renchao che Zhejiang Laboratory Hangzhou 311100China Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsAcademy for Engineering&TechnologyFudan UniversityShanghai 200438China Inner Mongolia University Hohhot 010021China

The hollow porous structure with exceptional interfacial effect and customizable internal environment shows significant potential for application as electromagnetic shielding and absorption ***,designing hollow porous electromagnetic absorbers with both desirable impedance matching and high loss capability remains a ***,3D hollow porous electromagnetic microspheres were constructed by assembling 0D Co magnetic nanoparticles,1D carbon nanotubes,and 2D carbon *** to the sufficient sites for Co^(2+)riveting,the high loading of magnetic carbon nanotubes(CoNC)and porous carbon spheres formed high-density interfaces,enhancing the interfacial ***,high-density CoNC were grown in situ on the hollow porous carbon(HPC)microsphere,forming a highly dispersed 3D magnetic network that inhibited the aggregation of magnetic nanoparticles and enhanced magnetic ***,the asprepared CoNC/HPC microspheres exhibited excellent microwave absorption(MA)performance,with a minimum reflection loss of-33.2 dB and an effective bandwidth of 5.5 gHz at a thickness of only 1.8 *** interfacial polarization mechanism for enhanced MA performance was demonstrated by electron holography and density functional theory *** holography and micromagnetic simulations also revealed magnetic confinement and coupling *** work provides a new approach for designing electromagnetic absorbers with optimized impedance matching and loss capability.

关键词： Microwave absorption Hollow porous structure Multidimensional assembly Interfacial polarization Magnetic coupling

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Influence of Two Preparation Methods on Rheological Properties of Lithium grease

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China Petroleum Processing & Petrochemical Technology 2020年第3期22卷 80-87页

作者： He yifeng SINOPEC Research Institute of Petroleum Processing Beijing 100083

The dropping point,cone penetration,corrosion,oil separation rate and oxidation stability of lithium grease prepared by two different processes at room temperature and high temperature were *** rheological properties of the samples were studied and analyzed with the microstructure of soap *** results show that the content of thickener used in grease prepared by the room temperature method is higher in order to obtain the same *** dropping point and evaporation loss of grease samples prepared by two processes are similar,and the oil separation rate of the lubricating grease prepared by the room temperature method is *** preparation process has a great influence on the rheological properties of grease,and the higher content of thickener is beneficial to improving the rheological properties of grease.

关键词： lubricating grease lithium grease rheology viscosity structure

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Ni-ANIPE-enabled dynamic kinetic asymmetric addition of ketones with organoboronates

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Science China chemistry 2023年第9期66卷 2437-2438页

作者： yifeng chen Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research CenterFrontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China

The enantioenriched tertiary alcohols are among the most privileged skeletons in pharmaceuticals,natural products and ***,tremendous effects have been devoted to constructing this chiral moiety,which constitutes the cornerstones in modern organic ***,the enantioselective nucleophilic addition of ketones functionality with the organometallics reagents represents one of the most reliable strategies to forge the tertiary carbon-oxygen bond.

关键词： synthesis tertiary boron

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Nash-equilibrium strategies of orbital TargetAttacker-Defender game with a non-maneuvering target

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Chinese Journal of Aeronautics 2024年第10期37卷 365-379页

作者： yifeng LI Xi LIANg Zhaohui DANg School of Astronautics Northwestern Polytechnical UniversityXi’an 710072China Beijing Institute of Astronautical Systems Engineering Beijing 100076China

This study investigates the orbital Target-Attacker-Defender(TAD)game problem in the context of space *** this game,the Attacker and the Defender compete for a Target that is unable to maneuver due to its original mission *** paper establishes three TAD game models based on the thrust output capabilities:unconstrained thrust output,thrust constrained by an upper bound,and fixed thrust *** models are then solved using differential game theory to obtain Nash equilibrium solutions for the game problems,and the correctness and effectiveness of the solution methods are verified through ***,an analysis of the winning mechanisms of the game is conducted,identifying key factors that influence the game’s outcomes,including weight coefficients in payoffs,the maximum thrust acceleration limit,and the initial game *** the unique characteristics of space missions,a specific focus is given to the analysis of the Defender’s initial states in the hovering formation and in-plane circling formation,revealing overall success patterns for defense strategies from these two *** summary,this study provides valuable insights into the control strategies and winning mechanisms of orbital TAD games,deepening our understanding of these games and offering practical guidance to improve success rates in real-world scenarios.

关键词： Target-Attacker-Defender problem Differential game TPBVP Continuous thrust Orbital game

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Adaptive level of autonomy for human-UAVs collaborative surveillance using situated fuzzy cognitive maps

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Chinese Journal of Aeronautics 2020年第11期33卷 2835-2850页

作者： Zhe ZHAO yifeng NIU Linche.g SHEN College of Intelligence Science and Technology National University of Defense TechnologyChangsha 410073China

Collaborating with a squad of Unmanned Aerial Vehicles(UAVs)is challenging for a human operator in a cooperative surveillance *** this paper,we propose a cognitive model that can dynamically adjust the Levels of Autonomy(LOA)of the human-UAVs team according to the changes in task complexity and human cognitive ***,we use the Situated Fuzzy Cognitive Map(Si FCM)to model the relations among tasks,situations,human states and LOA.A recurrent structure has been used to learn the strategy of adjusting the LOA,while the collaboration task is separated into a perception routine and a control *** results have shown that the workload of the human operator is well balanced with the task efficiency.

关键词： Adaptive LOA Cognitive Model Human-UAVs collaboration Situated Fuzzy Cognitive Map(SiFCM) Time series learning

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Zwitterionic polymer-coated porous poly(vinyl acetate–divinyl benzene)microsphere: A new support for enhanced performance of immobilized lipase

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Chinese Journal of chemical Engineering 2020年第1期28卷 242-248页

作者： yifeng Li Chunyu Zhang Yan Sun Department of Biochemical Engineering and Key Laboratory of Systems Bioengineering(Ministry of Education) School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300354China

Enzyme immobilization has attracted great attention for improving the performance of enzymes in industrial *** work was designed to create a new support for Candida rugosa lipase(CRL)immobilization.A porous poly(vinyl acetate–divinyl benzene)microsphere coated by a zwitterionic polymer,poly(maleic anhydride-alt-1-octadecene)and N,N-dimethylethylenediamine derivative,was developed for CRL immobilization via hydrophobic *** catalytic activity,reaction kinetics,stabilities and reusability of the immobilized CRL were *** demonstrated the success of the zwitterionic polymer coating and subsequent CRL immobilization on the porous *** immobilized lipase(p2-MS-CRL)reached27.6 mg·g^-1 dry carrier and displayed a specific activity 1.5 times higher than free *** increase of Vmax and decrease of Kmwere also observed,indicating the improvement of catalytic activity and enzyme-substrate affinity of the immobilized ***,p2-MS-CRL exhibited significantly enhanced thermal stability and pH *** improved performance was considered due to the interfacial activation regulated by the hydrophobic interaction and stabilization effect arisen by the zwitterionic polymer *** study has thus proved the advantages of the zwitterionic polymer-coated porous carrier for lipase immobilization and its potential for further development in various enzyme immobilizations.

关键词： Biocatalysis Lipase immobilization Zwitterionic polymer Hydrophobic binding Interfacial activation Stabilization

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Results on the realization of Boolean control networks by the vertex partition method

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Science China(Information Sciences) 2023年第7期66卷 210-223页

作者： yifeng LI Jiandong ZHU Xuewen LIU National Center for Applied Mathematics in Chongqing Chongqing Normal University School of Mathematical Sciences Nanjing Normal University

Realization problems, including the minimum realization of Boolean control networks(BCNs),are investigated by the vertex partition method. A general definition of the realization for BCNs that does not involve any subspaces is proposed. For the new and existing realization definitions, by a common concolorous perfect vertex partition(CCP-VP) of vertex-colored state transition graphs, an equivalence relation and a quotient mapping are defined, which induce a quotient system, i.e., the realization of original BCNs. In addition, if the CCP-VP is an equal partition, a realization induced by a Y-friendly controlled invariant regular subspace is constructed. Finally, an algorithm is designed to construct the minimum realization of BCNs for different realization definitions, and three examples are given to illustrate the obtained results.

关键词： Boolean control networks realization semi-tensor product of matrices vertex partition state transition graph

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