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Chinese Chemical Letters 2002年第12期13卷 1231-1234页

作者： He ping zeng Department of Chemistry South China Normal UniversityGuangzhou 510631

Photoinduced electron transfer processes between fullerenes (C60 / C70) and N, N, N, N tetra - ( p-methylphenyl ) - 4, 4 diamino - 1, 1- diphenyl ether ( TPDAE ) have been studied by nanosecond laser flash photolysis. Quantum yields and rate constants of electron transfer from TPDAE to excited triplet state of fullerenes (C60 / C70 ) in benzonitrile have been evaluated by observing the transient absorption bands in the near-IR region where the excited triplet state, radical anion of fullerenes ( C60 / C70 ) and radical cations of TPDAE appear.

关键词： Photoinduced electron transfer fullerenes ( C_(60) / C_(70) ) transient absorption bands.

NUMERICAL TECHNIQUE FOR TURBULENT TIDAL FLOW FIELD WITH ICE COVERS

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Journal of Hydrodynamics 1998年第1期10卷 94-101页

作者： zeng, ping Zhao, Yun China Inst of Water Resources & Hydropower Research Beijing China

Numerical modelling technique for ice flowing and melting field in coastal tidal currents for cooling water engineering design and research was presented based on k-Ε turbulence mathematical model and discretized moving-boundary-fitting coordinate system. To treat the complicated geometric, topographic and hydraulic conditions in a natural estuarine water were given. Numerical results show that model is practical and efficient to cooling water engineering research. An engineering application has been conducted by using the prediction on ice reduction and melting process by heated water discharges.

关键词： Computer simulation Flow of water Ice problems Numerical methods Tides Turbulent flow

Aggregation-regulated bioreduction process of graphene oxide by Shewanella bacteria

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Chinese Journal of Chemical Engineering 2024年第5期69卷 56-62页

作者： Kaixin Han Yibo zeng Yinghua Lu ping zeng Liang Shen Department of Chemical and Biochemical Engineering College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Pen-Tung Sah Institute of Micro-Nano Science and Technology Xiamen UniversityXiamen 361005China Chinese Research Academy of Environmental Sciences Beijing 100012China

The bioreduction of graphene oxide(GO)using environmentally functional bacteria such as Shewanella represents a green approach to produce reduced graphene oxide(rGO).This process differs from the chemical reduction that involves instantaneous molecular *** bioreduction,the contact of bacterial cells and GO is considered the rate-limiting *** reveal how the bacteria-GO integration regulates rGO production,the comparative experiments of GO and three Shewanella strains were carried ***-transform infrared spectroscopy,X-ray photoelectron spectroscopy,Raman spectroscopy,and atomic force microscopy were used to characterize the reduction degree and the aggregation *** results showed that a spontaneous aggregation of GO and Shewanella into the condensed entity occurred within 36 h.A positive linear correlation was established,linking three indexes of the aggregation potential,the bacterial reduction ability,and the reduction degree(ID/IG)comprehensively.

关键词： Graphene oxide Reduced graphene oxide Bioreduction Aggregation Shewanella

CONVERGENCE RATE OF A GENERALIZED ADDITIVE SCHWARZ ALGORITHM

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Journal of Computational Mathematics 2006年第5期24卷 635-646页

作者： Jin-ping zeng Gao-jie Chen College of Mathematics and Econometrics Hunan University Changsha 410082 China

The convergence rate of a generalized additive Schwarz algorithm for solving boundary value problems of elliptic partial differential equations is studied. A quantitative analysis of the convergence rate is given for the model Dirichlet problem. It will be shown that a greater acceleration of the algorithm can be obtained by choosing the parameter suitably. Some numerical tests are also presented in this paper.

关键词： Schwarz additive algorithm Convergence rate Dirichlet problem.

Topological Stability and Pseudo-orbit Tracing Property for Homeomorphisms on Uniform Spaces

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Acta Mathematica Sinica,English Series 2022年第2期38卷 431-442页

作者： Ke Song YAN Fan ping zeng School of Information and Statistics Guangxi University of Finance and EconomicsNanning 530003P.R.China

In this paper,we investigate the topological stability and pseudo-orbit tracing property for homeomorphisms on uniform *** introduce the concept of topological stability for homeomorphisms on compact uniform spaces and prove that if a homeomorphism on a compact uniform space is expansive and has pseudo-orbit tracing property,then it is topologically ***,we discuss the topological stability for homeomorphisms on uniform spaces from the view of *** introduce definitions of topologically stable point and shadowable point for homeomorphisms on uniform spaces and show that every shadowable point of an expansive homeomorphism on a compact uniform space is topologically stable.

关键词： Topological stability pseudo-orbit tracing property expansiveness uniform space

A New Subspace Correction Method for Nonlinear Unconstrained Convex Optimization Problems

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Acta Mathematicae Applicatae Sinica 2012年第4期28卷 745-756页

作者： Rong-liang CHEN Jin-ping zeng College of Mathematics and Econometrics Hunan University College of Computer Dongguan University of Technology

This paper gives a new subspace correction algorithm for nonlinear unconstrained convex optimization problems based on the multigrid approach proposed by S. Nash in 2000 and the subspace correction algorithm proposed by X. Tai and J. Xu in 2001. Under some reasonable assumptions, we obtain the convergence as well as a convergence rate estimate for the algorithm. Numerical results show that the algorithm is effective.

关键词： nonlinear optimization convergence subspace correction method

Interfacial microstructure evolution of 12Cr1MoV/TP347H dissimilar steel welded joints during aging

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International Journal of Minerals,Metallurgy and Materials 2021年第9期28卷 1497-1505页

作者： Yuan Li Yan-ping zeng Zhi-chun Wang School of Materials Science&Engineering University of Science and Technology BeijingBeijing 100083China North China Electric Power Research Institute Co. Ltd.Beijing 100045China

The interfacial microstructure evolution of 12Cr1MoV/TP347H dissimilar steel welded joints with a nickel-based filler metal during aging was studied in detail to elucidate the mechanism of premature failures of this kind of *** results showed that not only a band of granular Cr_(23)C_(6)carbides were formed along the fusion boundary in the ferritic steel during aging,but also a large number of granular or plate-like Cr_(23)C_(6)carbides,which have a cube-cube orientation relationship with the matrix,were also precipitated on the weld metal side of the fu-sion boundary,making this zone be etched more easily than the other zone and become a dark etched *** faults were found in some Cr_(23)C_(6)*** the as-welded state,deformation twins were observed in the weld metal with a fully austenitic *** peak micro-hardness was shifted from the ferritic steel side to the weld metal side of the fusion boundary after aging and the peak value increased *** on the experimental results,a mechanism of premature failures of the joints was proposed.

关键词： ferritic/austenitic dissimilar steel welded joint interfacial microstructure aging nickel-based filler metal mechanism of premature failures

Transient Spectroscopic Properties of [60]Fullerene-Containing Cyclic Sulphoxide

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Chinese Chemical Letters 2002年第6期13卷 567-570页

作者： He ping zeng Zhi zeng Ding Qiao YANG Department of Chemistry South China Normal UniversityGuangzhou 510631

The properties of the triplet excited state of [60]fullerene-containing cyclic sulphoxide have been investigated by time-resolved absorption spectroscopy. Transient absorption bands of [60]fullerene-containing cyclic sulphoxide showed two decay-components, which were attributed to triplet excited states of different spin multiplicity. The properties of photoexcited states of [60]fullerene-containing cyclic sulphoxide are also reported.

关键词： Fullerene-containing cyclic sulphoxide triplet excited state transient spectroscopic property time-resolved absorption spectroscopy.

An SQP Algorithm with Cautious Updating Criteria for Nonlinear Degenerate Problems

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Acta Mathematicae Applicatae Sinica 2009年第1期25卷 33-42页

作者： Tao-wen Liu Jin-ping zeng College of Mathematics and Econometrics Hunan University Changsha 410082 China College of Software Dongguan University of Technology Dongguan 523808 China

An efficient SQP algorithm for solving nonlinear degenerate problems is proposed in the paper. At each iteration of the algorithm, a quadratic programming subproblem, which is always feasible by introducing a slack variable, is solved to obtain a search direction. The steplength along this direction is computed by employing the 1∞ exact penalty function through Armijo-type line search scheme. The algorithm is proved to be convergent globally under mild conditions.

关键词： Degenerate problem exact penalty function SQP algorithm cautious update criteria globalconvergence

New Results on Common Properties of Bounded Linear Operators RS and SR

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Acta Mathematica Sinica,English Series 2013年第10期29卷 1871-1884页

作者： Qing ping zeng Huai Jie ZHONG School of Mathematics and Computer Science Fujian Normal University

Let X, Y be Banach spaces, R ： X → Y emd S ： Y →X be bounded linear operators. When λ ≠ 0, we investigate common properties of λ i - SR and ,λ I - RS. This work should be viewed as a continuation of researches of Barnes and Lin et al.. We also apply these results obtained to B-Fredholm theory, extensions and Aluthge transforms.

关键词： Regularity spectrum extension aluthge transform