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On Quasi-weakly Almost Periodic Points of Continuous Flows

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Acta Mathematica Sinica,English Series 2019年第2期35卷 257-269页

作者： Qi YAN jian dong YIN Department of Mathematics Nanchang University School of Mathematical science Xiamen University

Let X be a compact metric space, F : X ×R→ X be a continuous flow and x ∈ X a proper quasi-weakly almost periodic point, that is, x is quasi-weakly almost periodic but not weakly almost periodic. The aim of this paper is to investigate whether there exists an invariant measure generated by the orbit of x such that the support of this measure coincides with the minimal center of attraction of x? In order to solve the problem, two continuous flows are constructed. In one continuous flow,there exist a proper quasi-weakly almost periodic point and an invariant measure generated by its orbit such that the support of this measure coincides with its minimal center of attraction; and in the other,there is a proper quasi-weakly almost periodic point such that the support of any invariant measure generated by its orbit is properly contained in its minimal center of attraction. So the mentioned problem is sufficiently answered in the paper.

关键词： Continuous flow weakly almost periodic point quasi-weakly almost periodic point minimal center of attraction

Distributional Chaos Occurring on the Set of Proper Positive Upper Banach Density Recurrent Points of One-sided Symbolic Systems

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Acta Mathematica Sinica,English Series 2020年第1期36卷 66-76页

作者： Yan Jie TANG jian dong YIN Department of Mathematics Nanchang University

The purpose of this paper is to show that for one-sided symbolic systems,there exists an uncountable distributionally scrambled set contained in the set of proper positive upper Banach density recurrent points.

关键词： Distributional chaos positive upper Banach density recurrent point one-sided symbolic system

On the Eventual Shadowing Property and Eventually Shadowable Point of Set-valued Dynamical Systems

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Acta Mathematica Sinica,English Series 2022年第6期38卷 1105-1115页

作者： Xue Rong XIE jian dong YIN Department of Mathematics Nanchang UniversityNanchang 330031P.R.China

The authors introduce the concepts of the eventual shadowing property and eventually shadowable point for set-valued dynamical systems and prove that a set-valued dynamical system has the eventual shadowing property if and only if every point in the phase space is eventually shadowable;every chain transitive set-valued dynamical system has either the eventual shadowing property or no eventually shadowable points;and a set-valued dynamical system admits an eventually shadowable point if and only if it admits a minimal eventually shadowable ***,it is proved that a set-valued dynamical system with the eventual shadowing property is chain mixing if and only if it is mixing and if and only if it has the specification property.

关键词： Eventual shadowing property eventually shadowable point set-valued dynamical system specification

Several Dynamics of Dynamical Systems with the Eventual Shadowing Property

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Acta Mathematica Sinica,English Series 2023年第10期39卷 1907-1918页

作者： Xue Rong XIE jian dong YIN Department of Mathematics Nanchang UniversityNanchang 330031P.R.China

In this article,we provide some sufficient conditions for the dynamical systems with the eventual shadowing property to have positive topological entropy and several equivalent conditions for the dynamical systems wit... 详细信息

关键词： Eventual shadowing property eventually shadowable point topological entropy mixing

SLA-Aware and Energy-Efficient VM Consolidation in Cloud Data Centers Using Host State 3rd-Order Markov Chain Model

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Chinese Journal of Electronics 2020年第6期29卷 1207-1217页

作者： LI Lianpeng dong jian ZUO Decheng JI Songyan Harbin Institute of Technology

Virtual machine(VM) consolidation offers a promising approach to saving energy and improving resource utilization in cloud data ***,the aggressive consolidation of VMs may lead to Servicelevel agreement(SLA) violations,which are essential for data centers and their ***,it is essential to find a tradeoff between the reduction in SLA violation level and energy *** this paper,we improve and expand our Host state 3 rd-order Markov chain(HS3 MC)model proposed in our previous research comprehensively:we propose a new VM selection algorithm,an improved VM placement algorithm,and an HS3 MC-based VM consolidation algorithm based on our improved HS3 MC model for the SLA-aware and energy-efficient consolidation of VMs in cloud data *** evaluate our proposed algorithms on an extended Cloudsim simulator using the PlanetLab workload and a random ***,we improve and expand the OpenStack Neat experimental platform,and evaluate the performance of our algorithms in a real cloud environment based on *** experimental results show that our proposed model can significantly reduce the SLA violation rates while maintaining energy efficiency.

关键词： cloud computing computer centres Markov processes power aware computing resource allocation virtual machines energy efficiency SLA violation rates cloud environment improved HS3MC model consolidation algorithm HS3MC-based improved VM placement algorithm VM selection algorithm SLA violation level Service-level agreement violations improving resource utilization virtual machine consolidation Host state 3rd-order Markov chain model cloud data centers energy-efficient VM consolidation SLA-aware Virtual machine (VM) consolidation Cloud data centers Service-level agreement (SLA) SLAaware Energy-efficient OpenStack

Stride Strategy to Enable a Quasi-ergodic Search of Reaction Pathways Demonstrated by Ring-opening Polymerization of Cyclic Esters

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Chinese Journal of Polymer Science 2023年第5期41卷 745-759,I0009页

作者： Wei-Han Rao Lin Yu jian-dong Ding State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai 200438China

Coordination-insertion ring-opening polymerization(ROP)of cyclic esters is an industrial way to synthesize polyesters,which are widely applied in biomedical and environment-benign ***,the rate-determining transition state(TS)identified by the conventional reaction pathways(pathway A and pathway B)presented in the literature did not well describe the structure-reactivity *** misidentification of the rate-determining TS might arise from the less ergodicity in the search of reaction ***,we suggested a stride strategy based on the insight that even a partial double bond is rotatable at the catalysis *** a result,we revealed a new reaction pathway,pathway C with a torsion transition state TSC2,by density functional theory(DFT).We also carried out kinetic experiments of ROP of D-lactide(D-LA),L-lactide(L-LA),ε-caprolactone(CL),andδ-valerolactone(VL),using poly(ethylene glycol)as the initiator and stannous octoate as the *** excellent linearity between the calculated free energy barriers and logarithms of the experimental kinetic constants of the two kinds of lactide and lactone monomers,was established,validating the quasi-ergodic search of reaction pathways and the scaling predicted by transition state *** linearity was highly predictive for the other lactide and lactone monomers,demonstrated by glycolide(GA)and trimethylene urethane(TU).

关键词： Coordination-insertion mechanism Ring-opening polymerization Density functional theory Biodegradable polymer Lactide Lactone Cyclic ester

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

Constructed wetlands for wastewater treatment in cold climate--A review

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Journal of Environmental Sciences 2017年第7期29卷 293-311页

作者： Mo Wang dong Qing Zhang jian Wen dong Soon Keat Tan College of Landscape Architecture Fujian Agriculture and Forestry UniversityFuzhou 350002China Nanyang Environment&Water Research Institute 1 CleanTech Loop#06-10637141Singapore School of Civil and Environmental Engineering Nanyang Technological University639798Singapore

Constructed wetlands（CWs） have been successfully used for treating various wastewaters for decades and have been identified as a sustainable wastewater management option ***,the application of CW for wastewater treatment in frigid climate presents special *** treatment of wastewater relies largely on biological processes,and reliable treatment is often a function of climate *** date,the rate of adoption of wetland technology for wastewater treatment in cold regions has been slow and there are relatively few published reports on CW applications in cold *** paper therefore highlights the practice and applications of treatment wetlands in cold climate.A comprehensive review of the effectiveness of contaminant removal in different wetland systems including：（1） free water surface（FWS） CWs;（2） subsurface flow（SSF） CWs;and（3） hybrid wetland systems,is *** emphasis of this review is also placed on the influence of cold weather conditions on the removal efficacies of different *** strategies of wetland design and operation for performance intensification,such as the presence of plant,operational mode,effluent recirculation,artificial aeration and in-series design,which are crucial to achieve the sustainable treatment performance in cold climate,are also *** study is conducive to further research for the understanding of CW design and treatment performance in cold climate.

关键词： Constructed wetlands Wastewater treatment Nutrient Cold climate

Synthesis, Characterization and Properties of Poly(aryl amides) Containing Methoxy Substituted Phthalazinone Moiety

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Chinese Chemical Letters 2005年第10期16卷 1324-1326页

作者： Pei WANG jian dong LIU Xi Gao jian Department of Polymer Science ＆ Materials Dalian University of Technology Dalian 116012

A novel aromatic diamine, 1, 2-dihydro-2-（4-aminophenyl）-4-[3-methoxy-4-（4-aminophenoxy）]-2, 3-phthalazin-l-one （OO-DA） containing aza heterocyclic structure was synthesized from the bisphenol-like monomer in two steps and used for preparing new aromatic polyamides with high inherent viscosity of 0.89-1.03 dL.g^-1. The structures of diamine and polymers obtained were confirmed by MS, PT-IR, WAXD and ^1H-NMR. The synthesized polymers exhibited high glass transition temperature in the range of 281-307℃ and good solubility in polar solvents.

关键词： Poly(ether amides) phthalazinone solubility.