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Imazaquin degradation and metabolism in a sandy loam soil amended with farm litters

Journal of Environmental Sciences 2007年第9期19卷 1108-1113页

作者： wang hui-li li Yan-yan WEI Guo-hui wang Xue-dong Key Laboratory of Pesticide and Chemical Biology of Ministry of Education Central China Normal University Wuhan 430079 China

Irnazaquin applied in legume crops has a long residual time in soil, which often impacts safety of the susceptible crops. To increase safety of imazaquin application, two composted litters, bovine manure （BM） and chicken manure （CM）, were used to determine their effects on imazaquin environmental behavior by incorporating each kind of manure into the tested sandy loam soil at 10% （w/w）. The degradation of imazaquin in BM- and CM-amended soil was about 2.4 and 1.5 times, respectively, faster than that in unamended soil. The half-lives of imazaquin in BM-amended soil varied between 6.7 and 15.4 d over the temperature range of 20 to 40℃, and the degradation rate constant （k） increased by a factor of about 1.5 for every 10℃ change. Higher mix ratio did not significantly increase the degradation, and the optimal active degradation of imazaquin was observed approximately at the mix ratio of 10：1 of soil to BM. The different moisture levels had negligible effect on imazaquin degradation. In both unamended and BM-amended treatments, two metabolites were observed at 5, 10 and 30 d after treatment. One metabolite at retention time （RT） of 8.4 rain was identified as 2-（4- hydroxyl-5-oxo-2-imidazolin-2-yl） quinoline acid, originating from the loss of isopropyl group and hydroxylation at the 4-position of imidazolinone ring. The other at RT of 12.9 rain was identified as quinoline-2,3-dicarboxylic anhydride, resulting from detachment of imidazolinone ring and the forming of dicarboxylic anhydride. This finding suggested that the addition of farm litters into soil might be a good management option since it can not only increase soil fertility but also contribute to increase safety of imazaquin application to the following susceptible crops.

关键词： imazaquin farm litter enhanced degradation metabolite

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On-demand data broadcast scheduling based on AHP and GRA methods in wireless broadcast/UMTS integrated systems

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The Journal of China Universities of Posts and Telecommunications 2007年第4期14卷 1-6页

作者： wang hui li Chun JI Yang Key Laboratory of Universal Wireless Communications Beijing University of Posts and Telecommunications)Ministry of Education Wireless Technology Innovation LaboratoryBeijing100876China

The increasing demand for interactive mobile multimedia service is causing the integration of 3rd generation （3G） cellular systems and wireless broadcast systems. The key challenge is to support data dissemination with low response time, request drop rate, and the unfairness of request drop. This article proposes a novel scheduling algorithm called DAG （on-demand scheduling utilizing analytic hierarchy process （AHP） and grey relational analysis （GRA））, which takes multiple factors--waiting time, number of active requests, deadline--into consideration, and models the data scheduling process as a multiple factors＇ decision-making and best option-selecting process. The proposed approach comprises two parts. The first part applies AHP to decide the relative weights of multiple decision factors according to user requests, while the second adopts GRA to rank the data item alternatives through the similarity between each option and the ideal option. Simulation results are presented to demonstrate that DAG performs well in the multiple criterions mentioned above.

关键词： AHP DAG (on-demand scheduling utilizing AHPand GRA) GRA on-demand data broadcast scheduling

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^(40)Ar/^(39)Ar geochronology of the Faku tectonites:Implications for the tectonothermal evolution of the Faku block,northern liaoning

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Science China Earth Sciences 2005年第5期48卷 601-612页

作者： ZHANG Xiaohui wang hui li Tiesheng Key Laboratory of lithosphere Tectonic Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China Key Laboratory of Lithosphere Tectonic Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China Key Laboratory of Lithosphere Tectonic Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China

For lack of reliable isotopic chronological data, the metamorphic rock series in the Faku region of northern liaoning has long been regarded as the platform basement. Recent studies reveal that these deformed and metamorphosed rocks, with a variety of protoliths of plutonic intrusions and supracrustal volcanic and sedimentary rocks, were genetically related to later ductile shearing events, and they, together with the syntectonic intrusions, constituted the large-scale Faku tectonites. In this paper, we report new 40Ar/39Ar data on hornblende, biotite, and K-feldspar from typical granitic mylonites in this suite of tectonites. The plateau age 256 Ma of FK53 hornblende and the high-temperature plateau age 262 Ma of Fk51-1 biotite should rep- resent the cooling ages when the granites, formed as a result of Paleozoic oceanic crustal sub- duction beneath the continental crust or collision of multiple micro-continental blocks, were ex- humed into shallow crustal levels. The plateau age 231 Ma of FK51-1 boitite and the apparent age 227 Ma of Fk51-2 K-feldspar are interpreted to record the time of ductile deformation occur- ring under greenschist facies conditions, i.e. the formation age of the Faku tectonites, while the age gradient from 197 Ma to 220 Ma of Fk51-2 K-feldspar probably record the subsequent stable uplift-cooling process. The tectonic exhumation event indicated by the plateau age 180 Ma of Fk51-2 K-feldspar may be associated with the onset of paleo-Pacific subduction beneath the North China plate. In addition, the U-Pb dating of FK54 zircon from later-intruded granite yields the age of crystallization of this super-unit intrusion at 159 Ma, thus establishing an upper limit for the formation age of the Faku tectonites, while the plateau age 125 Ma of Fk54 K-feldspar most likely corresponds to the rapid cooling and tectonic denudation event associated with the final collision between the Siberian plate and the North China plate. These isotopic ages provide im-

关键词： northern liaoning, tectonite, 40Ar/39Ar age, zircon U-Pb age, Faku Faulted Convex.

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Changes in sea surface temperature in western South China Sea over the past 450 ka

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Chinese Science Bulletin 2009年第18期54卷 3335-3343页

作者： li li wang hui li JianRu ZHAO MeiXun wang PinXian State Key Laboratory of Marine Geology Tongji University Shanghai 200092 China

Sea surface temperature over the past 450 ka was obtained by the unsaturation of molecular fossil-long chain alkenone with a resolution of about 1 ka from the western South China Sea. This is the longest temperature profile in the South China Sea at such high resolution. The U3k7′-SST results revealed similar glacial-interglacial cycles as the δ18O profile of planktonic foraminifera, with SST variability of 23―25.5℃ for glacial and 25―28℃ for interglacial periods. The highest SST (28.4℃) was recorded at MIS5.5 and lowest SST (22.6℃) during MIS2. The SST record preceded the planktonic foraminiferal δ18O on five glacial-interglacial transitions. Comparison of temperature records from the Southern and Northern Hemispheres indicated a more Southern Hemisphere-like pattern for the temperature variation in the SCS. Strong precession and semiprecession signals in the spectra of our SST record manifest the tropical phenomena.

关键词：华南西部海表温度中国浮游有孔虫海温变化海上间冰期表面温度

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Distribution of gyrA mutations in fluoroquinolone-resistant Helicobacter pylori strains

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World Journal of Gastroenterology 2010年第18期16卷 2272-2277页

作者： wang, li-hui Cheng, Hong Hu, Fu-lian li, Jiang Peking Univ First Hosp Dept Gastroenterol Beijing 100034 Peoples R China

AIM:To investigate the resistance of Helicobacter pylori(***) to ciprofloxacin(CIP),levofloxacin(LVX) and moxifloxacin(MOX) in the Beijing area and to elucidate the resistance ***:Seventy-nine *** clinical strains,isolated from patients who had undergone upper gastrointestinal endoscopy in Peking University First Hospital from 2007 to 2009,were tested for their susceptibility to CIP,LVX and MOX using the E-test *** strain 26695 was included in the susceptibility testing as a control *** to the minimal inhibitory concentration(MIC) values,a strain was classified as resistant to CIP,LVX or MOX when the MIC was > 1 μg/*** amplified by polymerase chain reaction(PCR) and sequenced the quinolone resistance-determining regions of the gyrA and gyrB genes from 29 quinolone-resistant and 16 quinolone-susceptible *** strains selected at ***:In this study,the resistance rates of *** to CIP,LVX or MOX were 55.7%(44/79),and the primary resistance rates were 26.6%(21/79).Patients with secondary resistance had received LVX in previous eradication treatments,but not MOX or ***-five strains,including 29 CIP,LVX or MOX-resistant strains(MIC:1.5-32 μg/mL) and 16 susceptible strains,were selected randomly from the 79 strains and used in PCR *** these 45 strains,27 resistant strains had mutations in the gyrA gene,including 11 strains with mutations corresponding to Asp-91(MIC:2-32 μg/mL),one of which also had a mutation corresponding to Val-150,and 16 strains had mutations at Asn-87(MIC:4-32 μg/mL),three of which also had mutations corresponding to Arg-140 or *** addition,Arg-140,Val-150 or Ala-97 mutations were separately detected in three susceptible *** of the gyrB gene showed that one strain of low resistance had a mutation corresponding to Ser-457 that coexisted with an Asp-91 *** was a significant difference in the occurrence of mutations in the gyrA gene between

关键词： Helicobacter pylori Antibiotic resistance Quinolones Mutation gyrA

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Experimental Study on Engineering Behavior of Solidified Soil for Scour Repair and Protection

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China Ocean Engineering 2024年第4期38卷 625-635页

作者： WU Xiao-ni li Ru-yu SHU Jian TANG Chao CHEN Jin-jian wang hui-li JIANG Hai-li wang Xiao State Key Laboratory of Ocean Engineering Department of Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Road and Bridge Group Co. Ltd.Shanghai 200433China Shanghai Engineering Research Center of Urban Infrastructure Renewal Shanghai 200032China Jiangsu Kunze Technology Co. Ltd.Nanjing 210000China

A new scour countermeasure using solidified slurry for offshore foundation has been proposed *** solidified slurry is pumped to seabed area around foundation for scour protection or pumped into the developed scour holes for scour repair as the fluidized material solidifies *** the pumping operation and solidification,the engineering behaviors of solidified slurry require to be considered synthetically for the reliable application in scour repair and protection of ocean engineering such as the pumpability related flow value,flow diffusion behavior related rheological property,anti-scour performance related retention rate in solidification and bearing capacity related strength property after *** this study,a series of laboratory tests are conducted to investigate the effects of mix proportion(initial water content and binder content)on the flow value,rheological properties,density,retention rate of solidified slurry and unconfined compressive strength(UCS).The results reveal that the flow value increases with the water content and decreases with the binder *** the solidified slurry exhibits Bingham plastic behavior when the shear rate is larger than 5 s^(-1).The Bingham model has been employed to fit the rheology test results,and empirical formulas for obtaining the density,yield stress and viscosity are established,providing scientific support for the numerical assessment of flow and diffusion of solidified *** rate of solidified slurry decreases with the water flow velocity and flow value,which means the pumpability of solidified slurry is contrary to anti-scour *** unconfined compressive strength after solidification reduces as the water content increases and binder content decreases.A design and application procedure of solidified soil for scour repair and protection is also proposed for engineering reference.

关键词： scour repair and protection solidified soil pumpability strength flow properties anti-scour performance

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Studies on vibration characteristics of a pear using finite element method

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2006年第6期7卷 491-496页

作者： SONG hui-zhi wang Jun li Yong-hui Department of Biosystems Engineering Zhejiang University Hangzhou 310029 China

The variation of the vibration characteristics of a Huanghua pear was investigated using finite element simulations. A new image processing technique was used to obtain the unsymmetrical and un-spherical geometrical model of a pear. The vibra-tion characteristics of this type of pear with the correlation of its behavior with geometrical configurations and material charac-teristics were investigated using numerical modal analysis. The results showed that the eigenfrequency increased with the in-creasing pear Young’s modulus, while decreased with increasing pear density, and decreased with increasing pear volume. The results of this study provided foundation for further investigations of the physical characteristics of fruits and vegetables by using finite element simulations.

关键词： Pear Vibration characteristics Unsymmetrical and un-spherical model Finite element analysis

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Synthesis and characterization of novel polypropylene paper releasing anion

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Chinese Chemical Letters 2009年第4期20卷 483-486页

作者： li Qiu wang Qing Shan li hui Peng Ma Xiao Feng Guo Rui Hong wang Gang Yao College of Environmental and Chemical Engineering State Key Laboratory of Metastable Materials Science and Technology Yanshan University State Key Laboratory of Metastable Materials Science and Technology Qinhuangdao 066004 China

Polypropylene synthetic paper releasing anion was prepared from polypropylene resin, anion additives, titanium dioxide, etc., by calendar forming method. The synthetic paper was tested by anion detector, SEM, AFM, etc. Tensile strength, elongation at break, fight angle tear strength of the polypropylene synthetic paper reached the GB 13022 or QB/T1130 Standard. The synthetic paper was water and oil resistance, and released anions 10,530 cm^-3. It was environment-friendly, and a kind of good material for human＇s health.

关键词： Synthetic paper Polypropylene Functional polymer Health material Anions releasing

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Sustained release of Semaphorin 3A from a-tricalcium phosphate based cement composite contributes to osteoblastic differentiation of MC3T3-E1 cells

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Frontiers of Materials Science 2015年第3期9卷 282-292页

作者： Jin-Ning wang Bin PI Peng wang Xue-Feng li hui-lin YANG Xue-Song ZHU Department of Orthopaedic Surgery The first Affiliated Hospital of Soochow University Suzhou 215006 China

The reinforcement of calcium phosphate materials with silk fibroin （SF） has been one of the strategies to overcome the brittleness. However, the lack of osteoinductivity may still restrict their further use. This study aimed to investigate the biocompatibility and osteogenesis capacity of a novel Semaphorin 3A-loaded chitosan microspheres/SF/a-tricalcium phosphate composite （Sema3A CMs/SF/a-TCP） in vitro. Sema3A was first incorporated into CMs, and the Sema3A CMs/SF/a-TCP composite was then prepared. The morphology of the CMs was observed using SEM. The in vitro release kinetics, cytotoxicity, and cell compatibility were evaluated, and the real-time quantitative polymerase chain reaction （RT-qPCR） and activity of alkaline phosphatase （ALP） were used to evaluate the osteogenesis capacity of the composite. The in vitro release of Sema3A from the Sema3A CMs/SF/a-TCP composite showed a temporally controlled manner. The extract of the Sema3A CMs/SF/a-TCP composite presented no obvious side effect on the MC3T3-E1 cell proliferation, nor promote cell proliferation. The MC3T3-E1 cells were well-spread and presented an elongated shape on the Sema3A CMs/SF/a-TCP composite surface; the ALP activity and the osteogenic-related gene expression were higher than those seeded on the surface of the CMs/SF/a-TCP and SF/a-TCP composites. In conclusion, Sema3A CMslSF/a-TCP has excellent biocompatibility and contributes to the osteoblastic differentiation of MC3T3-E1 cells.

关键词： α-tricalcium phosphate (o-TCP) silk fibroin (SF) Semaphorin 3A osteo-blastic differentiation MC3T3-EI cell

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Identification of thermal effects involved in DSC experiment on Al-Cu-Mg-Ag alloys with high Cu:Mg ratio

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International Journal of Minerals,Metallurgy and Materials 2011年第6期18卷 671-675页

作者： Jian-bo Zhang Yong-an Zhang Bao-hong Zhu Feng wang Zhi-hui li Xi-wu li Bai-qing Xiong State Key Laboratory of Nonferrous Metals and Processes General Research Institute for Non-ferrous Metals Beijing 100088 China

Precipitation reactions in the differential scanning calorimetry （DSC） of an Al-Cu-Mg-Ag alloy were identified by analyzing the results from hardness test,electrical conductivity test,and transmission electron microscope （TEM） *** is discovered that thermal effects can be identified through selected area electron diffraction and bright-field *** reaction peaks around 171,231,and 276℃ can be attributed to a structural rearrangement of coherent zones,to the precipitation of Ω phases,and to the precipitation of Ω and θ＇ and possible combination with the transition of θ＇→θ,*** addition,the hardness and electrical conductivity of the alloy change proportionately with the progression of reactions during the heating *** phenomenon can be attributed to the evolution of the micro-structure.

关键词： aluminum alloys thermal effects identification differential scanning calorimetry microstructure

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