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Chinese Journal of Polymer Science 2024年第10期42卷 1449-1458,I0008页

作者： Qiu-Li Tan Kai Gou Jing-Zhi Tang Ming-Hui Wei Chong Wang Yi-Jing Nie geng-sheng weng School of Materials Science and Chemical Engineering State Key Laboratory Base of Novel Functional Materials and Preparation ScienceNingbo UniversityNingbo315211China Institute of Polymer Materials School of Materials Science and EngineeringJiangsu UniversityZhenjiang212013China

Thermochromic polymers with tunable thermochromism,high stretchability and mechanical strength are of interests for optical information storage and *** this work,we demonstrate a new design of thermo-fluorochromic carboxylated nitrile butadiene rubber(XNBR)elastomer cross-linked by Eu^(3+)-COOH dynamic coordination with deprotonated imidazole(DPIm)as the ancillary *** presence of DPIm not only improves the mechanical strength and stretchability,but also dramatically intensifies the fluorescence emission and lifetime of the Eu-containing *** elastomer behaves reversible thermo-fluorochromism with easily tunable transition temperature and emission intensity by the simple change of the deprotonation degree of *** facile tunable thermo-fluorochromism,exceptional mechanical strength,and high stretchability(up to about 5000%)enable the Eu-containing XNBR elastomer with potential applications in soft electronics where optical information storage and encryption are required.

关键词： Dynamic coordination Thermochromism Highly stretchable Elastomer Europium

Tough Double Metal-ion Cross-linked Elastomers with Temperature-adaptable Self-healing and Luminescence Properties

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Chinese Journal of Polymer Science 2021年第5期39卷 554-565,I0005页

作者： Qi-Yan Yin Cheng-Hao Dai Huan Chen Kai Gou Hong-Zhou Guan Peng-Han Wang Jing-Tao Jiang geng-sheng weng School of Materials Science and Chemical Engineering Ningbo UniversityNingbo 315211China Ningbo Key Laboratory of Specialty Polymers State Key Laboratory Base of Novel Functional Materials and Preparation ScienceNingbo UniversityNingbo 315211China

Smart materials with a combination of tough solid-like properties,fast self-healing and optical responsiveness are of interests for the development of new soft machines and wearable *** this work,tough physically cross-linked elastomers that show high mechanical strength,intriguing temperature-adaptable self-healing and fluorochromic response properties are designed using aluminum(Al)and fluorescent europium(Eu)ions as *** ionic Al-COOH binding is incorporated to construct the strong polymer network which mainly contributes to the mechanical robustness of the elastomer consisting of two interpenetrated *** Eu-iminodiacetate(IDA)coordination is mainly used to build the weaker but more dynamic network which dominate the elasticity,self-healing and luminescence of the *** Eu^(3+) and Al^(3+) contents give these supramolecular elastomers high *** temperature-sensitive Eu-IDA coordination enables tunable self-healing rate and efficiency along with fast Eu-centered"ON/OFF"switchable red *** mechanical,self-healing and luminescence properties of these elastomers can be adjusted by tuning the ratio of the two types of metal *** elastomer is potentially applicable for biosensors,wearable optoelectronics and anticounterfeiting materials.

关键词： Elastomer Tough Self-healing Luminescence Temperature-sensitive

Recent development in SU（3） covariant baryon chiral perturbation theory

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Frontiers of physics 2013年第3期8卷 328-348页

作者： Li-sheng geng School of Physics and Nuclear Energy Engineering Beihang University Beijing 100191 China International Research Center for Nuclei and Particles in the Cosmos Beihang University Beijing 100191 China

Baryon chiral perturbation theory （BChPT）, as an effective field theory of low-energy quantum chromodynamics （QCD）, has played and is still playing an important role in our understanding of non-perturbative strong-interaction phenomena. In the past two decades, inspired by the rapid progress in lattice QCD simulations and the new experimental campaign to study the strangeness sector of low-energy QCD, many efforts have been made to develop a fully covariant BChPT and to test its validity in all scenarios. These new endeavours have not only deepened our understanding of some long-standing problems, such as the power-counting-breaking problem and the convergence problem, but also resulted in theoretical tools that can be confidently applied to make robust predic- tions. Particularly, the manifestly covariant BChPT supplemented with the extended-on-mass-shell （EOMS） renormalization scheme has been shown to satisfy all analyticity and symmetry constraints and converge relatively faster compared to its non-relativistic and infrared counterparts. In this article, we provide a brief review of the fully covariant BChPT and its latest applications in the u, d, and s three-flavor sector.

关键词： chiral Lagrangians lattice QCD calculations baryon resonances hyperons

Optimal Control of Non-well-posed Heat Equations

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Acta Mathematica Sinica,English Series 2005年第5期21卷 1005-1014页

作者： geng sheng WANG Department of Mathematics Huazhong Normal University Wuhan 430079 P. R. China

This work is concerned with Pontryagin＇s maximum principle of optimal control problems governed by some non-well-posed semilinear heat equations. A type of approach to the non-well-posed optimal control problem is gi... 详细信息

关键词： Optimal control Non-well-posed heat equation State constraint

Finite-time sliding mode attitude control for a reentry vehicle with blended aerodynamic surfaces and a reaction control system

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Chinese Journal of Aeronautics 2014年第4期27卷 964-976页

作者： geng Jie sheng Yongzhi Liu Xiangdong Key Laboratory for Intelligent Control&Decision of Complex Systems Beijing Institute of Technology School of Automation Beijing Institute of Technology

This paper proposes a finite-time robust flight controller, targeting for a reentry vehicle with blended aerodynamic surfaces and a reaction control system（RCS）. Firstly, a novel finite-time attitude controller is pointed out with the introduction of a nonsingular finite-time sliding mode manifold. The attitude tracking errors are mathematically proved to converge to zero within finite time which can be estimated. In order to improve the performance, a second-order finite-time sliding mode controller is further developed to effectively alleviate chattering without any deterioration of robustness and accuracy. Moreover, an optimization control allocation algorithm, using linear programming and a pulse-width pulse-frequency（PWPF） modulator, is designed to allocate torque commands for all the aerodynamic surface deflections and on–off switching-states of RCS *** are provided for the reentry vehicle considering uncertain parameters and external disturbances for practical purposes, and the results demonstrate the effectiveness and robustness of the attitude control system.

关键词： Chattering alleviation Control allocation Finite-time convergence Flight control systems Second-order sliding mode Singularity elimination Sliding mode control

Efficient Hybrid Photovoltaic Devices Based on in-situ Electrochemical Copolymerization of 3-Methylthiophene and Bithiophene into Pores of Nanocrystalline TiO2

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Chemical Research in Chinese Universities 2013年第6期29卷 1208-1213页

作者： LU sheng-li geng Rui Institute for Organic Photovoltaic Materials and Devices School of Biological and Chemical EngineeringZhejiang University of Science and Technology Hangzhou 310023 P.R.China Department of Energy and Environmental System Engineering School of Light IndustryZhejiang University of Science and Technology Hangzhou 310023 P.R.China College of Chemical Engineering and Materials Science Zhejiang University of TechnologyHangzhou 310014 P.R.China

Novel organic and inorganic hybrid photovoltaic devices were thbricated by in-situ electrochemical copolymerization of 3-methylthiophene（3MT） and bithiophene（BT） into the pores of nanostructured TiO2 sintered on fluorine-doped tin oxide（FTO） substrate. The photoactive layer was investigated by Fourier transform infrared（FTIR） spectroscopy, ultraviolet-visable（UV-Vis） spectrometer, scanning electron microscope（SEM） and cyclic voltammo- gram characterization. Device efficiency based on different molar feed ratios of 3MT and BT during electrochemical polymerization, and the effect of in-situ copolymer state（doped by electrolyte and de-doped） were measured and compared. Under the solar illumination of 100 mW/cm2（AM 1.5）, an optimized device efficiency of 0.938% was obtained when the molar ratio of 3MT to BT was 500：1, polymerization time was 500 s and the system was in doped copolymer state, respectively. The mechanism of overall photovoltaic parameter improvement was discussed.

关键词： In-situ electrochemical polymerization Hybrid photovoltaic device Photovoltaic characterization

Diference Systems of Sets Based on Cosets Partitions

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Acta Mathematica Sinica,English Series 2013年第12期29卷 2261-2272页

作者： geng sheng ZHANG Hong Rui WANG College of Mathematics and Information Science Hebei Normal University Hebei Key Laboratory of Computational Mathematics and Applications

Difference systems of sets （DSS） are combinatorial configurations that arise in connection with code synchronization. This paper proposes a new method to construct DSSs, which uses known DSSs to partition some of the cosets of Zv relative to subgroup of order k, where v = km is a composite number. As applications, we obtain some new optimal DSSs.

关键词： Difference systems of sets code synchronization difference set coset optimal

FVS SCHEME FOR SEVERE TRANSIENT FLOW IN PIPE NETWORKS

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Journal of Hydrodynamics 2005年第5期17卷 621-628页

作者： geng Yan-fen WANG Zhi-li JIN sheng State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian116024 China Nanjing Hydraulic Research Institute Nanjing 210024 China State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116024 China

An efficient numerical method with first and second order accuracy is developed by the flux split technology to simulate the water hammer problem in single and multiple pipe networks under severe transient conditions. The finite volume formulation ensures that both schemes conserve mass and momentum and produces physically realizable shock fronts. The conception of the fictitious cell at the junction is developed. The typical water hammer problem and the experi ment with friction and the comprehensive orbicular network with control valve and pressure relief valve and surge tank are implemented to test the numerical method. Strong numerical evidences show that the proposed scheme has several desirable properties, such as, accurate, efficient, robust, high shock resolution, conservative and stable for Courant number.

关键词： pipe networks water hammer flux vector splitting fictitious cell finite volume method

Recent progress in cobalt-based compounds as high-performance anode materials for lithium ion batteries

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Rare Metals 2017年第5期36卷 307-320页

作者： Jian Wu Woon-Ming Lau Dong-sheng geng Center for Green Innovation Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface ScienceSchool of Mathematics and PhysicsUniversity of Science and Technology BeijingBeijing 100083China

Despite carbonaceous materials are widely employed as commercial negative electrodes for lithium ion battery, an urge requirement for new electrode materials that meet the needs of high energy density, long cycle life, low cost and safety is still underway. A number of cobalt-based compounds（Co（OH）_2, Co_3O_4, CoN, CoS,CoP, NiCo_2O_4, etc.） have been developed over the past years as promising anode materials for lithium ion batteries（LIBs） due to their high theoretical capacity, rich redox reaction and adequate cyclability. The LIBs performances of the cobalt-based compounds have been significantly improved in recent years, and it is anticipated that these materials will become a tangible reality for practical applications in the near future. However, the different types of cobalt-based compounds will result in diverse electrochemical performance. This review briefly analyzes recent progress in this field, especially highlights the synthetic approaches and the prepared nanostructures of the diverse cobalt-based compounds and their corresponding performances in LIBs, including the storage capacity, rate capability, cycling stability and so on.

关键词： Lithium ion batteries Anode materials Cobalt Conversion reaction

Molecular mechanism of SurA’s chaperoning function to outer membrane proteins revealed by purification-after-crosslinking single-molecule FRET

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Science China Chemistry 2020年第8期63卷 1142-1152页

作者： Chenhui He Sichen Pan geng Li Xin sheng Zhao School of Life Sciences Peking UniversityBeijing 100871China Biomedical Pioneering Innovation Center(BIOPIC) Peking UniversityBeijing 100871China Beijing National Laboratory for Molecular Sciences State Key Laboratory for Structural Chemistry of Unstable and Stable Speciesand Department of Chemical BiologyCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

SurA is the major chaperone of outer membrane proteins(OMPs)in the *** molecular mechanism when SurA performs its chaperoning function is still ***,a purification-after-crosslinking(PAC)procedure was combined with single-molecule fluorescence resonance energy transfer(smFRET)to probe the conformations of SurA and OmpC in their *** found that SurA in the free state rearranges itself based on the crystal structure,except that the P2 domain moves towards the core domain with two major positions,forming a clamp-like conformation to accommodate *** obvious rearrangement of the P2 domain of SurA helps SurA to hold *** attaches to SurA randomly and has the propensity to be near the middle part of the *** noncollapsed and disordered conformations of OMPs provided by the OMPs?SurA complex are important to the subsequent delivery and folding process.

关键词： outer membrane proteins SurA smFRET crosslinking