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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

A Two-stage Autonomous EV Charging Coordination Method Enabled by Blockchain

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Journal of Modern Power Systems and Clean Energy 2021年第1期9卷 104-113页

作者： jian ping Zheng Yan Sijie Chen Key Laboratory of Control of Power Transmission and Conversion Ministry of Education(Shanghai Jiao Tong University)ShanghaiChina

Increasing electric vehicle(EV) penetration in distribution networks necessitate EV charging coordination. This paper proposes a two-stage EV charging coordination mechanism that frees the distribution system operator(DSO) from extra burdens of EV charging coordination. The first stage ensures that the total charging demand meets facility constraints,and the second stage ensures fair charging welfare allocation while maximizing the total charging welfare via Nash-bargaining trading. A decentralized algorithm based on the alternating direction method of multipliers(ADMM) is proposed to protect individual privacy. The proposed mechanism is implemented on the blockchain to enable trustworthy EV charging coordination in case a third-party coordinator is absent. Simulation results demonstrate the effectiveness and efficiency of the proposed approach.

关键词： Electric vehicle(EV)charging coordination Nash bargaining alternating direction method of multipliers(ADMM) blockchain

Multisplitting Iteration Schemes for Solving a Class of Nonlinear Complementarity Problems

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Acta Mathematicae Applicatae Sinica 2007年第1期23卷 79-90页

作者： Chen-liang Li Jin-ping zeng College of Mathematics and Computer Science Hunan Normal University Changsha 410081 China Department of Computational Science and Mathematics Guilin University of Electronics Technology Guilin541004 China Institute of Applied Mathematics Hunan University Changsha 410082 China

We consider several synchronous and asynchronous multisplitting iteration schemes for solving a class of nonlinear complementarity problems with the system matrix being an H-matrix. We establish the convergence theorems for the schemes. The numerical experiments show that the schemes are efficient for solving the class of nonlinear complementarity problems.

关键词： Nonlinear complementarity problems asynchronous iteration H-matrix multisplitting method

NUMERICAL MODELLING OF NATURAL RIVER NETWORK

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Journal of Hydrodynamics 1995年第3期7卷 22-31页

作者： zeng, ping Li, Yucheng Zhao, Wenqian Dalian Univ of Technology Dalian China

A numerical model for the two-dimensional natural river network has been presented, which can be well suited for complex geometric boundary, topographic condition and hydraulic character. The branch computation method with conjoint equilibrium restraints, patched and shared coupling technique, and joint spreading process were developed. The applicability of the model was reasonably verified by some calculations.

关键词： Computer simulation Flow of water Mathematical models Turbulent flow Water pollution

Transient simulation and analysis of the simultaneous load rejection process in pumped storage power stations using a 1-D-3-D coupling method

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Journal of Hydrodynamics 2021年第5期33卷 979-991页

作者： Cheng-cheng Yin Wei zeng jian-dong Yang State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan 430072China School of Civil Environmental and Mining EngineeringThe University of AdelaideAdelaideAustralia

The load rejection imposes a danger in the pumped storage hydropower plants(PSPs),especially when two or more pump turbines reject their loads *** this paper,the simultaneous load rejection scenarios in the PSPs are simulated and analyzed by using a 1-D,3-D coupling *** PSP pipe system is modeled by using the 1-D method of characteristics(MOC)and one pump turbine is modeled by using the 3-D computational fluid dynamics(CFD).The simulated flow and head are transmitted between the 1-D,3-D regions through the interfaces between these two *** assuming that the installed pump turbines are of the same type and the corresponding branch pipes have the same properties,the variations of the transient pressures and the flowrates in different pump turbines will be ***,only one pump turbine is modeled by the CFD in this study.A new branching junction boundary is proposed to assign the simulated dynamic pressures and flowrates obtained by the 3-D model to other pump *** 1-D-3-D coupling method is validated by experiments with only one pump turbine rejecting its *** simultaneous load rejection of two pump turbines is then simulated and validated by comparing the results with those of the 1-D *** building only one pump turbine 3-D model,a large amount of computational resources can be *** simultaneous load rejection scenario is then analyzed and compared with the single load rejection *** water hammer pressures and a larger rotational speed occur in the simultaneous load rejection scenario,which leads to larger pressure pulsations in the pump *** larger pressure pulsations can be further explained by the flow patterns in the runner channels,in which heavier flow separations and vortexes can be observed in the simultaneous load rejection scenario.

关键词： Pump-turbine,pumped hydro computational fluid dynamics(CFD) hydraulic transient load rejection

Block Monotone Iterative Algorithms for Variational Inequalities with Nonlinear Operators

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Acta Mathematicae Applicatae Sinica 2008年第2期24卷 221-232页

作者： Ming-hui Ren Jin-ping zeng Department of Mathematics Hunan University of Arts and Science Changde 415000 China College of Software Dongguan University of Technology Dongguan 511700 China

Some block iterative methods for solving variational inequalities with nonlinear operators are proposed. Monotone convergence of the algorithms is obtained. Some comparison theorems are also established. Compared with the research work in given by Pao in 1995 for nonlinear equations and research work in given by zeng and Zhou in 2002 for elliptic variational inequalities, the algorithms proposed in this paper are independent of the boundedness of the derivatives of the nonlinear operator.

关键词： Monotone iterative algorithm upper solution lower solution comparison theorem variationalinequality

Facile tuning of hydrogel properties by manipulating cationic-aromatic monomer sequences

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Science China Chemistry 2021年第9期64卷 1560-1568页

作者： Hailong Fan Yirong Cai jian ping Gong Institute for Chemical Reaction Design and Discovery(WPI-ICReDD) Hokkaido UniversitySapporo001-0021Japan Graduate School of Life Science Hokkaido UniversitySapporo001-0021Japan Faculty of Advanced Life Science Hokkaido UniversitySapporo001-0021Japan Global Station for Soft Matter GI-CoRE Hokkaido UniversitySapporo001-0021Japan

Copolymer hydrogels formed from cationic and aromatic monomers with identical monomer compositions but different average sequences were synthesized by free-radical copolymerization in various *** found that hydrogels with one-componentrich segments are mechanically stronger than those with adjacent-rich monomer sequences in water,while hydrogels with a rich cation-πadjacent sequence showed excellent mechanical strength and underwater adhesion in saltwater(0.7 M Na Cl).The molecular mechanisms for these behaviors are discussed in terms of polymer *** work reveals the importance of monomeric sequences in determining hydrogel properties and provides a facile approach to develop hydrogels with different properties but the same monomer composition.

关键词： free-radical polymerization monomer sequence hydrogel cation-πinteractions underwater adhesion

Effect of microstructure on the low temperature toughness of high strength pipeline steels

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International Journal of Minerals,Metallurgy and Materials 2015年第3期22卷 254-261页

作者： Yan-ping zeng Peng-yu Zhu Ke Tong School of Materials Science and Engineering University of Science and Technology Beijing CNPC Tubular Goods Research Institute

Microstructure observations and drop-weight tear test were performed to study the microstructures and mechanical properties of two kinds of industrial X70 and two kinds of industrial X80 grade pipeline steels. The effective grain size and the fraction of high angle grain boundaries in the pipeline steels were investigated by electron backscatter diffraction analysis. It is found that the low temperature toughness of the pipeline steels depends not only on the effective grain size, but also on other microstructural factors such as martensite-austenite （MA） constituents and precipitates. The morphology and size of MA constituents significantly affect the mechanical properties of the pipeline steels. Nubby MA constituents with large size have significant negative effects on the toughness, while smaller granular MA constituents have less harmful effects. Similarly, larger Ti-rich nitrides with sharp corners have a strongly negative effect on the toughness, while fine, spherical Nb-rich carbides have a less deleterious effect. The low temperature toughness of the steels is independent of the fraction of high angle grain boundaries.

关键词： high strength pipe steels microstrucmre low temperature toughness influencing factors

Aging Characteristics, Stress Corrosion Behaviour and Role of Mg Segregation at Grain Boundary in 7175High-strength Al Alloy

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Journal of Materials Science & Technology 1998年第3期14卷 259-264页

作者： Song, Renguo Geng, ping zeng, Meiguang Zhang, Baojin Northeastern Univ Coll Sci Dept Mat Sci Shenyang 110006 Peoples R China

The aging characteristics, stress corrosion behavior and chemical composition of grain boundary in 7175 high-strength Al alloy during long term aging process have been investigated by hardness measurement, constant elongation rate testing (CERT) and energy spectroscopy analysis. The results indicate that double peaks in aged state feature the hardness and strength of 7175 Al alloy. Although the intensity of double peaks is almost equal, the stress corrosion resistance in the second peak-aged state is better than that of the first peak-aged state. The effects of Mg segregation on the binding energy of grain boundary have been calculated by using free electron theory developed in this paper. The results showed that Mg segregation plays a significant role in controlling stress corrosion susceptibility, which is consistent with the experimental results. (Edited author abstract) 32 Refs.

关键词： Aluminum alloys