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Proportional Current Sharing Based on Periodic Dynamic Event-driven H_(∞) Consensus in DC Microgrids with Power Coupling

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CSEE Journal of Power and Energy Systems 2022年第6期8卷 1558-1568页

作者： rui wang Qiuye Sun Lei liu li Zhang Peng wang Huaguang Zhang College of Information Science and Engineering Northeastern UniversityLiaoning 110819China College of Science Liaoning University of TechnologyLiaoning 121001China School of Electrical and Electronic Engineering Nanyang Technological University639798Singapore

Although the proportional current sharing has been widely studied,the heterogeneous characteristic of the different interfaced converters and power coupling terms among distributed generators(DGs)are rarely ***,this paper proposes a secondary H_(∞)consensus method with a periodic dynamic event-driven scheme for dc microgrids with power coupling to accomplish the precise proportional *** is useful for reducing ***,a generalized converter is constructed through equivalent transformation between rectifier and boost ***,the heterogeneous characteristic of the interfaced converters regarding different DGs,such as wind and solar generators,is embedded into controller ***,the standard linear heterogeneous multi-agent system with power coupling term is *** this basis,the problem of proportional current sharing is modified into the output consistency problem of multi-agent ***,the H_(∞)consensus approach is proposed to accomplish the precise proportional current ***,to shorten communication bandwidth,the periodic dynamic event-driven communication strategy is *** with traditional event-driven communication schemes,a lower communication frequency has been obtained through the proposed communication *** addition,this communication scheme not only avoids Zeno-behavior,but also acquires the smallest sampling time ***,effectiveness of the proposed approach is verified by two test systems.

关键词： Current sharing event-driven communication H_(∞)consensus approach heterogeneous distributed generators

An overview of healthcare monitoring by flexible electronics

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Science China(Physics,Mechanics & Astronomy) 2018年第9期61卷 1-18页

作者： JianQiao Hu rui li Yuan liu Ye wang Su State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering Mechanics and International Research Center for Computational Mechanics Dalian University of Technology Dalian 116024 China Applied Mechanics Laboratory School of Aerospace Engineering Tsinghua University Beijing 100084 China School of Engineering Science University of Chinese Academy of Sciences Beijing 100049 China State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and Technology Wuhan 430074 China

Flexible electronics integrated with stretchable/bendable structures and various microsensors that monitor the temperature,pressure, sweat, bioelectricity, body hydration, etc., have a wide range of applications in the human healthcare sector. The science underlying this technology draws from many research areas, such as information technology, materials science, and structural mechanics, to efficiently and accurately monitor technology for various signals. In this paper, we make a classification and comb to the designs, materials, structures and functions of numerous flexible electronics for signal monitoring in the human healthcare sector. Some perspectives in this field are discussed in the concluding remarks.

关键词： flexible electronics stretchable electronics signal monitoring human healthcare

Sulfurization accelerator coupled Fe_(1-x)S electrocatalyst boosting SPAN cathode performance

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Nano Research 2023年第7期16卷 9231-9239页

作者： Jinlei Qin Yun Lu rui wang Zhizhan li Tao Shen Deli wang Key Laboratory of Materials Chemistry for Energy Conversion and Storage of Ministry of Education Hubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Sulfurized polyacrylonitrile(SPAN)cathode exhibits improved cycling stability in carbonate electrolytes due to the existent of-S_(x)^(2-)-(2≤n≤4)***,it is still challenging for SPAN to achieve higher sulfur content,superior conductivity,and faster polysulfide conversion kinetics in ether ***,polyacrylonitrile(PAN),2-morpholinothiobenzothiazole(MBS),and FeCl_(3)coated reduced graphene oxide(rGO)were used to fabricate advanced sulfur cathode through electrospinning technology to address these *** PAN sulfuration reactions,the MBS with abundant unsaturated bonds served as the vulcanization accelerator to facilitate the formation of longer chain sulfur species(-S_(3)-/-S_(4)-)and increase the sulfur content in the SPAN electrode ***,Fe_(1-x)S is in situ converted from FeCl_(3),which acts as the electrocatalyst to promote li_(2)S nucleation and decomposition *** a result,the Fe_(1-x)S/SPAN/rGO electrode with high sulfur loading of 2.0 mg·cm^(-2)delivers a reversible capacity of 1122 mAh·g^(-1)at 0.1 A·g^(-1).Notably,at a large current density of 5.0 A·g^(-1),the Fe_(1-x)S/SPAN/rGO electrode still displays a high specific capacity of 924 mAh·g^(-1)with an ultra-stable cycling life over 2000 *** present work provides new insights into designing of high-performance electrode materials for long-lasting li-S batteries.

关键词： li-S batteries electrocatalyst electrospun sulfurized polyacrylonitrile(SPAN) vulcanization accelerators

Simple synthesis of silver nanocluster composites AgNCs@PE-g-PAA by irradiation method and fluorescence detection of Cr^(3+)

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Nuclear Science and Techniques 2023年第5期34卷 101-111页

作者： Fei Han Wen-rui wang Dan-Yi li Mou-Hua wang Ji-Hao li lin-Fan li Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Wuwei Institute of New Energy Wuwei 733000China

Silver nanoclusters(AgNCs)are a new type of nanomaterials with similar properties to molecules and unique *** applications of AgNCs can be significantly expanded by combining them with different matrix materials to obtain AgNC *** irradiation techniques,we developed a simple two-step method for preparing silver nanocluster ***,polyacrylic acid(PAA)chains were grafted onto the surface of a PE film as templates(PE-g-PAA).Subsequently,silver ions were reduced in situ on the surface of the template material to obtain the AgNC composites(AgNCs@PE-g-PAA).The degree of AgNC loading on the composite film was easily controlled by adjusting the reaction *** loaded AgNCs were anchored to the carboxyl groups of the PAA and wrapped in the graft *** particle size of the AgNCs was only 4.38±0.85 nm,with a very uniform particle size *** AgNCs@PE-g-PAA exhibited fluorescence characteristics derived from the *** fluorescence of the AgNCs@PE-g-PAA was easily quenched by Cr^(3+)*** composite can be used as a fluorescence test paper to realize visual detection of Cr^(3+).

关键词： Silver nanoclusters Irradiation grafting Irradiation reduction In situ preparation Fluorescence detection

In-situ growth of CoNi bimetal anchored on carbon nanoparticle/nanotube hybrid for boosting rechargeable Zn-air battery

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Journal of Energy Chemistry 2022年第3期31卷 348-355,I0010页

作者： Jun li Yongxia wang Zhengyu Yin rui He Yihao wang Jinli Qiao State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Environmental Science and EngineeringDonghua UniversityShanghai 201620China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

Exploring highly efficient non-precious metal based catalysts for bifunctional oxygen electrode is crucial for rechargeable metal-air *** this study,with MOFs as precursors,a facile coprecipitation method is designed to realize in-situ growth of the CoNi anchored carbon nanoparticle/nanotube(CoNi/N-CNN)hybrid,which can achieve the simultaneous maximum exposure of both oxygen evolution reaction(OER)and oxygen reduction reaction(ORR)active *** from the unique structure,the CoNi/N-CNN catalyst exhibits excellent electrocatalytic performance for ORR(E_(onset)=1.183 V,E_(1/2)=0.819 V)and a low operating voltage of 1.718 V at 10 mA cm^(−2)(Ej=10)for ***,the home-made rechargeable Zn-air battery with CoNi/N-CNN delivers a high discharge power density up to 209 mW cm^(−2),and an outstanding charge–discharge cycling *** boosted bifunctional electrocatalytic activity can be ascribed to the strong coupling effect between Co/Ni center sites and defect-rich N-anchored carbon featured with porous and nanotube structure,which can introduce uniformly dispersed active sites,tailored electronic configuration,superb conductivity and convenient charge transfer *** hybrid non-precious bimetal based electrocatalyst provides the possibility to develop the low-cost and high-efficient ORR/OER bifunctional electrocatalysts in rechargeable metal-air battery.

关键词： Co Ni/N-CNN Bifunctional electrocatalyst Oxygen electrode Rechargeable Zn-air battery

Self-lubrication of tribologically-induced oxidation during dry reciprocating sliding of aged Ti–Ni51.5 at% alloy

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Friction 2021年第5期9卷 1038-1049页

作者： rui YANG Wei MA Chunjian DUAN Song li Tingmei wang Qihua wang State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

The tribological behaviors of Ti–Ni51.5 at%alloy strengthened by finely dispersed Ni_(4)Ti_(3) particles in reciprocating sliding against GCr15,Al_(2)O_(3),and ZrO_(2) at room temperature were ***,the coefficient of friction(COF)suffered a sheer drop(from 0.9 to 0.2)when the aged alloy slid against GCr15 at a frequency of 20 Hz under a 20 N load without ***,severe‐mild wear transition disappeared when a solutionized alloy was ***,the COF stabilized at a relatively high level when Al_(2)O_(3) and ZrO_(2) were used as counterparts,although their wear mechanisms showed signs of *** electron microscopy(SEM)and X‐ray element mappings of the wear scars of the counterparts clearly indicate that the formation of well‐distributed tribo‐layer and material transfer between the ball and disk are pivotal to the severe‐to‐mild wear transition in the aged Ti–Ni51.5 at%alloy/GCr15 friction *** higher microhardness and superelasticity of the aged alloy significantly accelerate the material transfer from GCr15 to the disk,forming a glazed protective tribo‐layer containing Fe‐rich oxides.

关键词： self‐lubrication tribologically‐induced oxidation Ti–Ni51.5 at%alloy dry reciprocating sliding counterparts

Numerical Study of Storm Surge Inundation in the Southwestern Hangzhou Bay Region During Typhoon Chan-Hom in 2015

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Journal of Ocean University of China 2020年第2期19卷 263-271页

作者： wang Kai HOU Yijun li Shuiqing DU Mei li rui Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China Laboratory for Ocean and Climate Dynamics Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China Numerical Simulation Division North China Sea Marine Forecasting Center of State Oceanic AdministrationQingdao 266000China

Storm surge inundation is a major concern in marine hazard risk assessment during extreme weather *** this study,a high-resolution coupled model(the ADVanced CIRCulation model+the Simulating WAves Nearshore model)was used to investigate the storm surge inundation in the southwestern Hangzhou Bay region during Typhoon Chan-hom in *** simulated hydrodynamic processes(sea surface wave and storm tide)were validated with measured data from wave buoys and tide gauges,indicating that the overall performance of the model was *** storm surge inundation in the coastal area was simulated for several idealized control experiments,including different wave effects(wave-enhanced wind stress,wave-enhanced bottom stress,and wave radiation stress).Dike overflowing cases with different dike heights and dike breaking cases with different dike breach lengths were considered in the *** results highlight the necessity of incorporating wave effects in the accurate simulation of storm surge *** height significantly influences the magnitude and phase of the maximum inundation area in the dike overflowing cases,and dike breach length is an important factor impacting the magnitude of the maximum inundation area in the dike breaking *** study may serve as a useful reference for accurate coastal inundation simulation and risk assessment.

关键词： storm surge typhoon waves dike overflowing dike breaking inundation ADCIRC+SWAN

Economic and entropy production evaluation of extractive distillation and solvent-assisted pressure-swing distillation by multi-objective optimization

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Chinese Journal of Chemical Engineering 2023年第11期63卷 246-259页

作者： Yao wang Qing Ye Jinlong li Qingqing rui Azhi Yu Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology School of Petrochemical EngineeringChangzhou UniversityChangzhou 213164China

Extractive distillation(ED)and solvent-assisted pressure-swing distillation(SA-PSD)are both special distillation processes that perform good at separating pressure-insensitive ***,few reported studies have compared the performance of the two *** this paper,ED processes with N-methylpyrrolidone(NMP)and dimethlac-etamide(DMCA)as entrainer,SA-PSD process with isopropyl-alcohol(IPA)as solvent and SA-PSD process with partial heat integration(PHI-PSD)are proposed to achieve high purity separation of a mixture of cyclohexane/2-butanol *** optimal operating conditions of the processes are obtained after optimizing with NSGA-Ⅱ algorithm when total annual cost(TAC)and the entropy production of process are set as *** optimal results show that the optimal PHI-PSD process has lower TAC by 28.7% and the lower entropy production by 39.5% than the optimal SA-PSD process while the ED process with NMP as entrainer has lower TAC by 50.9% and the lower entropy production by 56.1% than the optimal SA-PSD *** optimal results show that the ED process with NMP as entrainer has the best economic and thermodynamic efficiency among the four proposed processes in this paper.

关键词： Extractive distillation Solvent-assisted pressure-swing distillation Entropy production NSGA-Ⅱalgorithm Computer simulation

Research and application of reanalysis data for radio astronomical site testing

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Research in Astronomy and Astrophysics 2020年第12期20卷 279-286页

作者： Ming-Shuai li rui li Na wang Xing-Wu Zheng Xinjiang Astronomical Observatory Chinese Academy of Sciences830011 UrumqiChina Key Laboratory of Radio Astronomy Chinese Academy of Sciences210034 NanjingChina School of Astronomy&Space Science Nanjing UniversityNanjing 210093China

Selecting a good site for ground-based astronomy is very important. Based on the ERA-Interim global reanalysis data, this paper studied the atmospheric conditions of the Qitai Telescope(QTT) site from the aspects of absolute humidity, mixing ratio and precipitable water vapor(PWV). Error estimations of meteorological parameters are also analyzed. These primary results show that the QTT site has obvious advantages in terms of conditions with much less atmospheric water vapor than two well-known existing sites with 100-meter-aperture radio telescopes in the world. In addition, due to the influence of atmospheric water vapor on radio observations, the atmospheric transmittance for each frequency band of the site are simulated, and the atmospheric opacity is also calculated as well as Planck radiation brightness. Based on these results, the effective observational time of different bands is further estimated.

关键词： site testing opacity radiative transfer