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Hardware system design for UHF surface velocities radar

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Journal of Systems Engineering and Electronics 2007年第2期18卷 255-258页

作者： Wen Biyang Ma Zhigang yuan fei Zhou Hao School of Electronic Information Wuhan Univ. Wuhan 430079 P. R. China Southwest China Research Inst. of Electronic Equipment Chengdu 610036 P. R. China

UHF surface velocities radar is developed based on the successful ocean state measuring and analyzing radar system. The design method for UHF radar system is presented. It is designed to operate at UHF channel, and the transmit power is under 5W. Maximum range of field test over fresh water can be a kilometer. The field tests at Tangsun River and at Majiatan and Gaobazhou proved that USVR System can be used successfully.

关键词： UHF Surface velocities radar Bragg resonant.

Directional Photo-manipulation of Self-assembly Patterned Microstructures

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Chinese Journal of Polymer Science 2018年第3期36卷 297-305页

作者： Wei Wang fei Gao yuan Yao Shao-Liang Lin Shanghai Key Laboratory of Advanced Polymeric Materials Key Laboratory for Ultrafine Materials of Ministry of EducationSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China

Highly intricate surface architectures derived from patterned polymer microstructures have received increasing concern in recent *** photo-manipulation(DPM)of azopolymers is one of the effective strategies to tune the patterned polymer microstructures through directional mass migration(DMM)upon polarized light *** this feature article,we emphasize the latest advances of DPM on azopatterns created by *** mechanism of DMM,the photo-manipulation performance,and functions of manipulated patterns are introduced in *** presented,DPM can manipulate the as-prepared microstructures feasibly by taking the advantages of non-contacting and nondestructive ***,the challenges and opportunities of DPM strategy are discussed in conclusion.

关键词： Self-assembly Directional photo-manipulation Surface patterning Azopolymer

A Dynamic Resource Allocation Strategy with Reinforcement Learning for Multimodal Multi-objective Optimization

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Machine Intelligence Research 2022年第2期19卷 138-152页

作者： Qian-Long Dang Wei Xu Yang-fei yuan School of Mathematics and Statistics Xidian UniversityXi’an 710126China

Many isolation approaches, such as zoning search, have been proposed to preserve the diversity in the decision space of multimodal multi-objective optimization(MMO). However, these approaches allocate the same computing resources for subspaces with different difficulties and evolution states. In order to solve this issue, this paper proposes a dynamic resource allocation strategy(DRAS)with reinforcement learning for multimodal multi-objective optimization problems(MMOPs). In DRAS, relative contribution and improvement are utilized to define the aptitude of subspaces, which can capture the potentials of subspaces accurately. Moreover, the reinforcement learning method is used to dynamically allocate computing resources for each subspace. In addition, the proposed DRAS is applied to zoning searches. Experimental results demonstrate that DRAS can effectively assist zoning search in finding more and better distributed equivalent Pareto optimal solutions in the decision space.

关键词： Multimodal multi-objective optimization(MMO) dynamic resource allocating strategy(DRAS) reinforcement learning(RL) decision space partition zoning search

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Single Peak Solutions for a Schr?dinger Equation with Variable Exponent

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Acta Mathematica Sinica,English Series 2023年第11期39卷 2207-2218页

作者： Zhong yuan LIU Peng LUO Hua fei XIE School of Mathematics and Statistics He’nan UniversityKaifeng 475004P.R.China School of Mathematics and Statistics&Hubei Key Laboratory of Mathematical Sciences Central China Normal UniversityWuhan 430079P.R.China School of Mathematics and Statistics Nanyang Normal UniversityNanyang 473061P.R.China

We study the following Schr?dinger equation with variable exponent−Δu+u=u^(p+∈a)(x),u>0 in R^(N),where∈>0,1 详细信息

We study the following Schr?dinger equation with variable exponent−Δu+u=u^(p+∈a)(x),u>0 in R^(N),where∈>0,1

关键词： Single peak solutions Schr?dinger equation variable exponent

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Over-sampling basis expansion model aided channel estimation for OFDM systems with ICI

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The Journal of China Universities of Posts and Telecommunications 2008年第4期15卷 7-13页

作者： LIU Si-yang LIU yuan-an WANG fei-fei XIE Gang ZHANG Ran-ran Key Laboratory of Universal Wireless Communications (Beijing University of Posts and Telecommunications) Ministry of Education Beijing 100876 China

The rapid variation of channel can induce the intercarrier interference in orthogonal frequency-division multiplexing （OFDM） systems. Intercarrier interference will significantly increase the difficulty of OFDM channel estimation because too many channel coefficients need be estimated. In this article, a novel channel estimator is proposed to resolve the above problem. This estimator consists of two parts： the channel parameter estimation unit （CPEU）, which is used to estimate the number of channel taps and the multipath time delays, and the channel coefficient estimation unit （CCEU）, which is used to estimate the channel coefficients by using the estimated channel parameters provided by CPEU. In CCEU, the over-sampling basis expansion model is resorted to solve the problem that a large number of channel coefficients need to be estimated. Finally, simulation results are given to scale the performance of the proposed scheme.

关键词： OFDM ICI over-sampling basis expansion model (OBEM)

Laboratory-scale column study for remediation of TCE-contaminated aquifers using three-section controlled-release potassium permanganate barriers

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Journal of Environmental Sciences 2013年第5期25卷 971-977页

作者： Baoling yuan fei Li Yanmei Chen Ming-Lai Fu Institute of Municipal and Environmental Engineering College of Civil EngineeringHuaqiao University College of Civil Engineering Fuzhou University Key Laboratory of Urban Environment and Health Institute of Urban EnvironmentChinese Academy of Sciences

A laboratory-scale study with a sand column was designed to simulate trichloroethylene（TCE） pollution in the aquifer environment with three-section controlled-release potassium permanganate（CRP） *** main objective of this study was to evaluate the feasibility of CRP barriers in remediation of TCE in aquifers in a long-term and controlled *** particles with a 1：3 molar ratio of KMnO 4 to stearic acid showed the best controlled-release properties in pure water,and the theoretical release time was 138.5 *** results of TCE removal in the test column indicated that complete removal efficiency of TCE in a sand column by three-section CRP barriers could be reached within 15 *** molar ratio of KMnO 4 to TCE in the three-section CRP barriers was 16：1,which was much lower than 82：1 as required when KMnO 4 solution is used directly to achieve complete destruction of *** result revealed that the efficiency of CRP for remediation of TCE was highly improved after encapsulation.

关键词： chlorinated solvent encapsulation groundwater KMnO 4 permeable reactive barrier sand column

Enhancement of thermophilic anaerobic digestion of thickened waste activated sludge by combined microwave and alkaline pretreatment

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Journal of Environmental Sciences 2011年第8期23卷 1257-1265页

作者： Yongzhi Chi Yuyou Li Xuening fei ShaopoWang Hongying yuan Tianjin Key laboratory of Aquatic Science and Technology Department of Environmental and Municipal Engineering Tianjin Institute of UrbanConstruction Tianjin 300384 China. Department of Environmental Science Graduate School of Environmental Studies Tohoku University Sendai 980-8579 Japan

Pretreatment of thickened waste activated sludge （TWAS） by combined microwave and alkaline pretreatment （MAP） was studied to improve thermophilic anaerobic digestion efficiency. Uniform design was applied to determine the combination of target temperature （110-210°C）, microwave holding time （1-51 min）, and NaOH dose （0-2.5 g NaOH/g suspended solids （SS）） in terms of their effect on volatile suspended solids （VSS） solubilization. Maximum solubilization ratio （85.1%） of VSS was observed at 210°C with 0.2 g-NaOH/g-SS and 35 min holding time. The effects of 12 different pretreatment methods were investigated in 28 thermophilic batch reactors by monitoring cumulative methane production （CMP）. Improvements in methane production in the TWAS were directly related to the microwave and alkaline pretreatment of the sludge. The highest CMP was a 27% improvement over the control. In spite of the increase in soluble chemical oxygen demand concentration and the decrease in dewaterability of digested sludge, a semi-continuous thermophilic reactor fed with pretreated TWAS without neutralization （at 170~C with 1 min holding time and 0.05 g NaOH/g SS） was stable and functioned well, with volatile solid （VS） and total chemical oxygen demand （TCOD） reductions of 28% and 18%, respectively, which were higher than those of the control system. Additionally, methane yields （L@STP/g-CODaded, at standard temperature and pressure （STP） conditions of 0°C and 101.325 kPa） and （L@STP/g VSadad） increased by 17% and 13%, respectively, comoared to the control reactor.

关键词： thickened waste activated sludge microwave pretreatment alkaline pretreatment thermophilic anaerobic digestion

Removal efficacy and mechanism of nitrogen and phosphorus by biological aluminum-based P-inactivation agent (BA-PIA)

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Journal of Environmental Sciences 2023年第5期127卷 187-196页

作者： Yichao Wang Shuai yuan Shupo Liu fei Li Zhenming Zhou College of Civil Engineering Huaqiao UniversityXiamen 361021China

In this study,aluminum-based P-inactivation agent(Al-PIA)was used as a high-efficiency microbial carrier,and the biological Al-PIA(BA-PIA)was prepared by artificial *** static experiments were conducted to study the effect of BA-PIA on reducing nitrogen and phosphorus contents in *** characterization and isotope tracing method were applied to analyze the removal mechanism of nitrogen and ***-throughput techniques were used to analyze the characteristic bacterial genus in the BA-PIA *** nitrogen and phosphorus removal experiment was conducted for 30 days,and the removal rates of NH_(4)^(+)-N,TN and TP by BA-PIA were 81.87%,66.08%and 87.97%,*** nitrogen removal pathways of BA-PIA were as follows:the nitrification reaction accounted for 59.0%(of which denitrification reaction accounted for 56.4%),microbial assimilation accounted for 18.1%,and the unreacted part accounted for 22.9%.The characteristic bacteria in the BA-PIA system were Streptomyces,Nocardioides,Saccharopolyspora,Nitrosomonas,and *** loading of microorganisms only changed the surface physical properties of Al-PIA(such as specific surface area,pore volume and pore size),without changing its surface chemical *** removal mechanism of nitrogen by BA-PIA is the conversion of NH_(4)^(+)-N into NO_(2)^(−)-N and NO_(3)^(−)-N by nitrifying bacteria,which are then reduced to nitrogen-containing gas by aerobic denitrifying *** phosphorus removal mechanism is that metal compounds(such as Al)on the surface of BA-PIA fix phosphorus through chemisorption processes,such as ligand ***,BA-PIA overcomes the deficiency of Al-PIA with only phosphorus removal ability,and has better application prospects.

关键词： Biological aluminum-based P-inactivation agent(BA-PIA) Biofilms formed by artificial aeration Nitrogen Phosphorus 15N isotope tracer High-throughput sequencing analysis

Alumina modified sodium vanadate cathode for aqueous zinc-ion batteries

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Frontiers in Energy 2023年第6期17卷 775-781页

作者： Linsong GAN fei LIU Xinhai yuan Lijun FU Yuping WU State Key Laboratory of Materials-Oriented Chemical Engineering School of Energy Science and EngineeringNanjing Tech UniversityNanjing 211816China

Aqueous zinc-ion batteries (ZIBs) have great prospects for widespread application in massive scale energy storage. By virtue of the multivalent state, open frame structure and high theoretical specific capacity, vanadium (V)-based compounds are a kind of the most developmental potential cathode materials for ZIBs. However, the slow kinetics caused by low conductivity and the capacity degradation caused by material dissolution still need to be addressed for large-scale applications. Therefore, sodium vanadate Na_(2)V_(6)O_(16)·3H_(2)O (NVO) was chosen as a model material, and was modified with alumina coating through simple mixing and stirring methods. After Al_(2)O_(3) coating modification, the rate capability and long-cycle stability of Zn//NVO@Al_(2)O_(3) battery have been significantly improved. The discharge specific capacity of NVO@Al_(2)O_(3) reach up to 228 mAh/g (at 4 A/g), with a capacity reservation rate of approximately 68% after 1000 cycles, and the Coulombic efficiency (CE) is close to 100%. As a comparison, the capacity reservation rate of Zn//NVO battery is only 27.7%. Its superior electrochemical performance is mainly attributed to the Al2O3 coating layer, which can increase zinc-ion conductivity of the material surface, and to some extent inhibit the dissolution of NVO, making the structure stable and improving the cyclic stability of the material. This paper offers new prospects for the development of cathode coating materials for ZIBs.

关键词： cathodes aqueous zinc-ion batteries sodium vanadate alumina coating