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Spatial and temporal distribution of acetochlor in sediments and riparian soils of the Songhua River Basin in northeastern China

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Journal of Environmental Sciences 2011年第10期23卷 1684-1690页

作者： Xiaoyin Sun Qixing Zhou Wenjie Ren xuhui li liping Ren Key Laboratory of Terrestrial Ecological Process Institute of Applied Ecology Chinese Academy of Sciences Shenyang 110016 China Graduate School of the Chinese Academy of Sciences Beijing 100049 China College of Geography and Tourism Shandong Qufu Normal University Qufu 273165 China Key Laboratory of Pollution Processes and Environmental Criteria （Ministry of Education） College of Environmental Science and Engineering Nankai University Tianjin 300071 China

The Songhua River Basin is a burgeoning agricultural area in the modern times in China. Particularly in recent years, increasing chemical fertilizers and pesticides have been applied with the development of agricultural production. However, the situation of non- point source pollution （NSP） from agricultural production in this basin is still obscure. In order to solve the problem, the occurrence and distribution of acetochlor in sediments and riparian soils of the Songhua River Basin before rain season and after rain season were investigated. In addition, total organic carbon was analyzed. The result showed that the concentration of acetochlor ranged from 0.47 to 11.76 μg/kg in sediments and 0.03 to 709.37 μg/kg in riparian soils. During the high flow period in 2009, the mean concentration was 4.79 μg/kg in sediments and 0.75 μg]kg in riparian soils, respectively. Similarly, the mean concentration was 2.53 μg/kg in sediments and 61.36μg/kg in riparian soils, during the average flow period in 2010. There was a significant correlation between the concentration of acetochlor and total organic carbon in surface sediments. Moreover, the distribution of acetochlor in sediments of the Songhua River was significantly correlated to land use and topography of the watershed. The investigated data suggested that the concentration of acetochlor in the Songnen Plain and the Sanjiang Plain was higher than that in the other areas of the basin, and riparian buffering zones in these areas bad been destroyed by human activities. The optimal agricultural measures to alleviate the contamination of pesticides should be adopted, including controlling agricultural application of acetochlor and ecological restoration of riparian buffering strips.

关键词： acetochlor Songhua River Basin non-point source pollution optimal agricultural measure

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Electrochemical properties of room temperature ionic liquids incorporating BF_4^- and TFSI^- anions as green electrolytes

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Chinese Science Bulletin 2005年第18期50卷 2005-2009页

作者： ZHANG Zhengxi GAO xuhui YANG li School of Chemistry and Chemical Technology. Shanghai Jiaotong University Shanghai 200240 China

Two series of room temperature ionic liquids, 1-alkyl-3-methylimidazolium tetrafluoroborate and 1-alkyl- 3-methylimidazolium bis(trifluoromethylsulfonyl)imide (n = 2―4) as electrolytes were prepared and fundamental elec-trochemical properties of the neat ionic liquids and those mixed with an organic solvent (EC-DMC-DEC, 1:1:1, mass ratio) were investigated. It was found that the Arrhenius equation is approximately fit for the relationship between conductivity and temperature for neat ionic liquids within lower temperature range (298―323 K). The VTF interpreta-tion describes the conductivity temperature dependence for the ionic liquids containing tetrafluoroborate anion more accurately than those containing bis(trifluoromethylsulfon- yl)imide anion within wider temperature range. The poten-tial windows are approximately 4.0 V for all these ionic liq-uids. Conductivities of the mixed electrolytes show a maxi-mum value as the solution concentrations increase.

关键词：电气化学电解液离子溶液空间温度传导性

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Simultaneous removal and oxidation of arsenic from water byδ-MnO 2 modified activated carbon

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Journal of Environmental Sciences 2020年第8期32卷 147-160页

作者： Yulong Wang Hupeng liu Shaofeng Wang xuhui li Xin Wang Yongfeng Jia Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions College of Environment and PlanningHenan UniversityKaifeng 475004China Key Laboratory of Pollution Ecology and Environmental Engineering Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China National Demonstration Center for Environmental and Planning Henan UniversityKaifeng 475004China

The ubiquitous arsenic in groundwater poses a great risk to human health due to its environmental toxicity and *** the present work,a new adsorbent,δ-MnO2 modified activated carbon,was prepared,and its performance for the uptake of arsenate and arsenite species from aqueous solutions was investigated by batch *** techniques,including FESEM-EDX,p-XRD,XPS and BET surface area analysis,were employed to characterize the properties of the adsorbent and the arsenic adsorption *** results showed thatδ-MnO2 covered on the surface and padded in the pores of the activated *** kinetic studies revealed that approximately 90.1%and 76.8%of As(Ⅲ)and As(V),respectively,were removed by the adsorbent in the first 9 hr,and adsorption achieved equilibrium within 48 *** maximum adsorption capacities of As(V)and As(Ⅲ)at pH 4.0 calculated from Langmuir adsorption isotherms were 13.30 and 12.56 mg/g,*** effect of pH on As(Ⅴ)and As(Ⅲ)removal was similar,and the removal efficiency significantly reduced with the increase of solution *** oxidation and adsorption kinetics showed that the As(Ⅴ)concentration in solution due to As(Ⅲ)oxidation and reductive dissolution of MnO2 increased rapidly during the first 12 min,and then gradually *** on the XPS analysis,nearly 93.3%of As(Ⅲ)had been oxidized to As(V)on the adsorbent surface and around 38.9%of Mn(Ⅳ)had been reduced to Mn(Ⅱ)after As(Ⅲ)*** approach provides a possible method for the purification of arsenic-contaminated groundwater.

关键词： δ-MnO 2 modified activated carbon Arsenate Arsenite Adsorption Oxidation

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A tunable adaptive detector for distributed targets when signal mismatch occurs

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Journal of Systems Engineering and Electronics 2023年第4期34卷 873-878页

作者： CUI Yufeng WANG Yongliang liU Weijian DU Qinglei ZHANG Xichuan li xuhui Air Force Early Warning Academy Wuhan 430019China Unit 93128 of the PLA Beijing 100843China Unit 93155 of the PLA Chengdu 610041China

Aiming at the problem of detecting a distributed target when signal mismatch occurs,this paper proposes a tunable detector parameterized by an adjustable *** adjusting the parameter,the tunable detector can achieve robust or selective detection of mismatched ***,the proposed tunable detector,with a proper tunable parameter,can provide higher detection probability compared with existing detectors in the case of no signal *** addition,the proposed tunable detector possesses the constant false alarm rate property with the unknown noise covariance matrix.

关键词： multichannel signal detection target detection distributed target signal mismatch

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Mobile agent-enabled framework for structuring and building distributed systems on the internet

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Science in China(Series F) 2006年第6期49卷 885-905页

作者： CAO Jiannong ZHOU Jingyang ZHU Weiweit li xuhui Internet and Mobile Computing Lab Department of Computing Hong Kong Polytechnic University Hung Hom KLW Hong Kong China State Key Lab of Novel Software Technologies Nanjing University Nanjing 210093 China State Key Lab of Software Engineering Wuhan University Wuhan 430072 China

Mobile agent has shown its promise as a powerful means to complement and enhance existing technology in various application areas. In particular, existing work has demonstrated that MA can simplify the development and improve the performance of certain classes of distributed applications, especially for those running on a wide-area, heterogeneous, and dynamic networking environment like the Internet. In our previous work, we extended the application of MA to the design of distributed control functions, which require the maintenance of logical relationship among and/or coordination of processing entities in a distributed system. A novel framework is presented for structuring and building distributed systems, which use cooperating mobile agents as an aid to carry out coordination and cooperation tasks in distributed systems. The framework has been used for designing various distributed control functions such as load balancing and mutual ex- clusion in our previous work. In this paper, we use the framework to propose a novel approach to detecting deadlocks in distributed system by using mobile agents, which demonstrates the advantage of being adaptive and flexible of mobile agents. We first describe the MAEDD （Mobile Agent Enabled Deadlock Detection） scheme, in which mobile agents are dispatched to collect and analyze deadlock information distributed across the network sites and, based on the analysis, to detect and resolve deadlocks. Then the design of an adaptive hybrid algorithm derived from the framework is presented. The algorithm can dynamically adapt itself to the changes in system state by using different deadlock detection strategies. The performance of the proposed algorithm has been evaluated using simulations. The results show that the algorithm can outperform existing algorithms that use a fixed deadlock detection strategy.

关键词： mobile agent internet computing distributed systems deadlock detection.

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Interfacial assembly of a series of Cu(Ⅱ)-coordinated Schiff bases complexes:Orderly nanostructures and supramolecular chirality

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Science China(Technological Sciences) 2013年第1期56卷 20-24页

作者： JIAO TiFeng li xuhui ZHANG QingRui li QiuRong ZHOU JingXin GAO FaMing Hebei Key Laboratory of Applied Chemistry School of Environmental and Chemical EngineeringYanshan University State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of Sciences

Four achiral Cu(Ⅱ)-coordinated Schiff bases complexes containing aromatic structures were synthesized and their supramolecular assemblies at the air/water interface were *** the compounds could be spread on water surface although they have no alkyl *** Schiff base complex molecules with naphthyl groups tended to form J-aggregate in the Langmuir-Blodgett(LB) films transferred from water *** investigation of atomic force microscopy,a multilayer film or three-dimensional structures were *** was interesting to note that the LB films of achiral compound Cu-NA with naphthyl segment and without methyl groups transferred from water surface showed *** supramolecular chirality in the present LB films was suggested to be due to a cooperative stereoregular-stacking of the functional groups in a helical *** research work provides a helpful clue for regulating the nanostructures and supramolecular chiral assembly in organized films.

关键词： interfacial assembly Langmuir-Blodgett film supramolecular chirality Schiff base

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qSTA2-2,a novel QTL that contributes to seed starch synthesis in Zea mays L.

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Journal of Integrative Agriculture 2024年第4期23卷 1118-1133页

作者： Minghao Cai xuhui li Zhi liang Jie Wang Delin li Zhipeng Yuan Riliang Gu Jianhua Wang li li State Key Laboratory of Maize Bio-breeding/Key Laboratory of Crop Heterosis Utilization Ministry of Education/Beijing Innovation Center for Crop Seed Technology/College of Agronomy and BiotechnologyChina Agricultural UniversityBeijing 100193China Institute of Nanfan&Seed Industry Guangdong Academy of ScienceGuangzhou 510316China Institute of Crop Sciences Chinese Academy of Agricultural SciencesBeijing 100081China

The seed storage materials accumulate during seed development,and are essential for seed germination and seedling *** we employed two bi-parental populations of an F2:3 population developed from a cross of improved 220(I220,small seeds with low starch)and PH4CV(large seeds with high starch),as well as recombinant-inbred lines(RILs)of X178(high starch)and its improved introgression line I178(low starch),to identify the genes that control seed storage *** identified a total of 12 QTLs for starch,protein and oil,which explained 3.44-10.79%of the phenotypic *** them,qSTA2-1 identified in F2:3 and qSTA2-2 identified in the RILs partially overlapped at an interval of 7.314-9.554 Mb,and they explained 3.44-10.21%of the starch content variation,so they were selected for further *** mapping of qSTA2-2 with the backcrossed populations of ^(I220)/PH4CV in each generation narrowed it down to a 199.7 kb interval that contains 14 open reading frames(ORFs).Transcriptomic analysis of developing seeds from the near-isogenic lines(NILs)of ^(I220)/PH4CV(BC_(5)F_(2))showed that only 11 ORFs were expressed in 20 days after pollination(DAP)*** of them were upregulated and six of them were downregulated in NIL^(I220),and the differentially expressed genes(DEGs)between NIL^(I220) and NIL^(PH4CV) were enriched in starch metabolism,hormone signal transduction and glycosaminoglycan *** the eleven NIL^(I220) differential expressed ORFs,ORF4(Zm00001d002260)and ORF5(Zm00001d002261)carry 75%protein sequence similarity,both encodes an glycolate oxidase,were the possible candidates of *** analysis and validation indicated that mutation of the qSTA2-2 locus resulted in the dysfunction of ABA accumulation,the embryo/endosperm ratio and the starch and hormone levels.

关键词： QTL mapping seed starch transcriptomic analysis hormone

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Single-cell RNA sequencing reveals the landscape of maize root tips and assists in identification of cell type-specific nitrate-response genes

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The Crop Journal 2022年第6期10卷 1589-1600页

作者： xuhui li Xiangbo Zhang Shuai Gao Fangqing Cui Weiwei Chen lina Fan Yongwen Qi Institute of Nanfan&Seed Industry Guangdong Academy of ScienceGuangzhou 510316GuangdongChina College of Agriculture and Biology Zhongkai University of Agriculture and EngineeringGuangzhou 510325GuangdongChina

The root system is fundamental for maize growth and *** its heterogeneity and cell type-specific response to nitrate at the single-cell level will shed light on root development and nutrient *** profiled the transcriptomes of>7000 cells derived from root tips of maize seedlings grown on media with or without nitrate,and identified 11 major cell types or tissues and 85 cell type-specific nitrate-response genes,including several known nitrate metabolic genes.A pseudotime analysis showed a continuous pseudotime series with the beginning at meristematic zone cells and showed that the root hair cell was derived by differentiation of a subset of epidermal *** comparison of root cells between maize and rice revealed the conservation and divergence of the root cell types and identified 57,216,and 80 conserved orthologous genes in root hair,endodermis,and phloem cells *** study provides a global view of maize root tip developmental processes and responses to nitrate at the single-cell *** genes described in the present work could serve as targets for further genetic analyses and accurate regulation of gene expression and phenotypic variation in specific cell types or tissues.

关键词： Maize Single-cell RNA sequencing Root Nitrate

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Register Reallocation for Soft Error Reduction

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Wuhan University Journal of Natural Sciences 2014年第6期19卷 519-525页

作者： WEN Peng YAN Guochang li xuhui YING Shi School of Information Management Wuhan Univeristy State Key Laboratory of Software Engineering Wuhan University

Subsequently to the problem of performance and energy overhead, the reliability problem of the system caused by soft error has become a growing concern. Since register file（RF） is the hottest component in processor, if not well protected, soft errors occurring in it will do harm to the system reliability greatly. In order to reduce soft error occurrence rate of register file, this paper presents a method to reallocate the register based on the fact that different live variables have different contribution to the register file vulnerability（RFV）. Our experimental results on benchmarks from MiBench suite indicate that our method can significantly enhance the reliability.

关键词： register allocation soft error reliability

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A Personalized Microbe Biodiversity Dataspace Information System

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Wuhan University Journal of Natural Sciences 2007年第5期12卷 932-936页

作者： liU Junqiang PENG Zhiyong li xuhui ZHENG Congyi FANG Chengxiang State Key Laboratory of Software Engineering Wuhan University Wuhan 430072 Hubei China School of life Sciences Wuhan University Wuhan 430072 Hubei China

It can not provide dynamic view mechanism in previous dataspace information system. In this paper, the dynamic extendable view mechanism provided by object deputy model is proposed for personalized dataspace information system which can provide rich semantics and enough flexibility. The flexible inheritance avoids a lot of data redundancy. The cross class query mechanism allows users to find more related data based on complex relationships. The personalized dataspace service provides less storage space consumption and shorter query response time. The experiment result shows that our approach is more feasible and efficient than the traditional one.

关键词： object deputy model biodiversity cross class query personalized dataspace

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