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Search Results: 1 - 10 of 22862 matches for " HUA Rimao "
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Effects of dissolved compounds on photodegradation of mefenacet in water

CHU Mingjie,YUE Yongde,HUA Rimao,TANG Feng,

应用生态学报 , 2006,
Abstract: The study with high-pressure mercury lamp illuminating showed that after illuminated for 15 min, NO2- and NO3- quenched the photolysis of mefenacet, and NO3- with a concentration ratio 10:1 (mass) had the most obvious effect, its quenching rate being up to 53.3%. Halogen ions inhibited the photolysis of mefenacet by "weight atom effect". When the concentration ratio of I- was 10:1, the quenching rate was 76.9% after illuminated for 15 min. Surfactants Nongru 500, Nongru 404, Nongru 601 and Nongru 603 had different effects on the photodegradation of mefenacet. At concentration ratios 1:5 and 1:1, only Nongru 404 showed a weak photosensitive effect, while in the other cases, all the four surfactants had photoquenching effects. Among the four herbicides benthiocarb, bensulfuron, alachlor and chlorsulfuron, only bensulfuron at low concentration ratio (1 : 10) accelerated the photolysis of mefenacet, with a photosensitive proportion of 18.2% after illuminated for 25 min. Aerified N2 could accelerate the photolysis of mefenacet, and the half-life was shortened from 7.14 min to 6.70 min without aerifying N2.
Studies on photodegradation of carbendazim in solvents and aqueous solutions

XU Baocai,YUE Yongde,HU Yinghui,HUA Rimao,

环境科学学报 , 2000,
Abstract: Under sunlight or high pressure mercury lamp(HPML),the phototransformation of carbendazim in solvents and aqueous solutions was studied.The main results were summarized as follows:Carbendazim decomposed very slowly in aqueous phase, n \|hexane and methanol under sunlight.The photolytic rate of MBC in acetone was high with half\|life of 33.80?h.Photosensitizer such as riboflavin,0 5% acetone and Fe 3 ,can enhance photolysis of MBC in aqueous solutions.Among them,riboflavin is the most senstivive one MBC can be degraded by 53 47% after 16 hours.Three pesticides,namely,triadimefon,butachlor,and carbofuran can affected significantly the photodecomposition of MBC in water under HPML.By 2 hours irradiation,the photoquench efficiency of triadimefon,butachlor and carbofuran on cabendazim are 244 05%,252 81%,and 262 92%,respectively.Under HPML,direct photolysis is the main process.The half\|life in redistilled water is 74 62?min.The photolytic rates of carbendazim in different water types or pH show following sequence:redistilled water>river water>pond water,or,pH4>pH9>pH7.
Studies on the photodegradation of Mefenacet in different water samples

CHU Mingjie,YUE Yongde,HUA Rimao,TANG Feng,

环境科学学报 , 2005,
Abstract: To study the effect of different waters on the photodegradation of Mefenacet, the photolysis of Mefenacet in pure water, natural water and buffer was studied. It indicated that in natural water samples, under the high-pressure mercury lamp(HPML) and xenon lamp(XL), the photo-half-lives of Mefenacet ranged samely as: paddy water > river water > lake water > river water(reservoir water) > redistilled water. The photo-half-lives under XL ranged from 607.80?min to (1016.40)?min, and under HPML ranged from 12.31?min to 18.53?min respectively. At room temperature, Mefenacet hydrolyzed easily in solution of pH=11.92. Under HPML, in buffers of pH=1.98 and 11.92, it photodegraded faster than in pure water, and the half-lives were 6.04?min(pH=1.98), 6.51?min(pH=11.92) and 6.75?min(redistilled water) respectively. Detecting the photoproducts by HPLC-MS indicated that a Metabolic pathway of mefenacet initiated by hydrolysis of amido groups and ether groups.
Photochemical degradation of chlorothalonil in aqueous solution

LI Xuede,HUA Rimao,YUE Yongde,LI Ying,TANG Feng,TANG Jun,

应用生态学报 , 2006,
Abstract: The study on the effects of light source, solution pH and temperature, and surfactant on the photochemical degradation of chlorothalonil showed that the half-life of chlorothalonil photodegradation under high pressure mercury lamp (HPML), UV lamp and sunlight was 22.4, 82.5 and 123.8 min, respectively. Under HPML and sunlight, chlorothalonil had a higher photolysis rate in alkaline solution than in neutral and acid solution. The photolysis rate increased with increasing solution temperature in the range of 10 degrees C - 40 degrees C, which was doubled when the temperature increased every 10 degrees C. Sodium laurylsulfonate (SDS), sodium dodecylbenzene sulfonate (SDBS), Tween 60 and Span 20 showed significant photosensitizing effects, while cetyltrimethylammonium bromide (CTAB) had significant photoquench effect on the photolysis of chlorothalonil.
Slope weighted scoring method for eutrophication comprehensive evaluation of lake

DENG Dapeng,LIU Gang,LI Xuede,TANG Feng,HUA Rimao,

环境科学学报 , 2006,
Abstract: There are different widths among 10 intervals of each assessment indicator through analysis on Control Standard for Eutrophication Surface Water, which indicate weight of each indicator should be changed with its monitored value. Based on above thoughts, a novel method, named Slope Weighted Scoring Method, is proposed for eutrophication comprehensive evaluation of lakes on the basis of Interpolation Scoring Method. All boundary data listed in assessment standard are normalized to eliminate influence of dimension. Slopes of 10 intervals of each indicator are calculated with normalized boundary data. First step of using this method is calculating corresponding trophic state score of each indicator with interpolation method according to its monitored value and assessment standard. The slope of each indicator is recorded simultaneously. Second step is allocating weight for each indicator with all recorded slopes. Finally, comprehensive trophic state score is obtained with weighted mean method according to scores and weights of all indicators. The proposed method makes the most of slopes of all indicators' intervals in assessment standard to allocate the weight of each indicator dynamically. The character of weights dynamic allocation answers to the nonlinear mapping essence of eutrophication comprehensive evaluation. Applying this method, Interpolation Method and Comprehensive Trophic Level Index Method to evaluate eutrophication of Chaohu Lake, the results showed that there was significant difference between this method and Interpolation Scoring Method, and the most significant difference between this method and Comprehensive Trophic Level Index Method.
Photoquenching effect of nine pesticides on the photolysis of butachlor in water

HUA Rimao,YUE Yongde,QI Chuanyong,TANG Feng,LI Xiangqiong,FAN Defang,

环境科学学报 , 2000,
Abstract: The photoquenching effects of bensulfuron\|methyl,acetochlor, trifluralin,MCPA,glyphosate,methsulfuron methyl,methomyl,parathion\|methyl,carbendazim on the butachlor photolysis in water under xenon lamp, high pressure mercury lamp and sunlight irradiation were studied.The results showed: The photolysis rate of butachlor was slow down by these tested pesticides;the photoquenching efficiencies of glyphosate,parathion\|methyl and acetochlor were higher than the others.The photoquenching efficiency was positively related to the dosage of parathion\|methyl,trifluralin,glyphosate and bensulfuron\|methyl.
luxAB labelling of chlorpyrifos-degrading strain β by electroporation

WANG Yunlu,HUA Rimao,TANG Xinyun,LI Ruixue,ZHANG Jun,WANG Daosheng,

环境科学学报 , 2011,
Abstract: 建立luxAB标记毒死蜱降解菌的新方法,为监测毒死蜱降解菌在环境中的定殖动态和对毒死蜱的降解活性提供考察方法和技术支持。本实验采用电转化法将带发光酶基因luxAB的质粒pTR102导入毒死蜱降解菌β菌株,研究了细胞生长状态、电压强度、电击时间和质粒浓度对转化效率的影响,并对转化子的生理特性进行研究。实验结果表明,以对数早期的菌液制备感受态细胞,在质粒浓度16.5μg·mL-1,电压2.5kV,电击时间3ms条件下的转化率最高,可达2.73×102个·μg-1(以每μg质粒DNA中所含转化子个数计)。转化子lux-β分别在抗生素平板和LB平板中传代10次,仍具有发光活性和对卡那霉素(Km)的抗性,说明质粒pTR102在转化子中可以稳定遗传。转化子的生理特性变化不显著,对毒死蜱的降解能力较出发菌株提高了近一倍。
Effect of hydroxide radical and surfactant on photodegradation of acetochlor

HUA Rimao,XU Li,YUE Yongde,TANG Feng,LI Xuede,CAO Haiqun,WU Xiangwei,

环境科学学报 , 2006,
Abstract: 以高压汞灯为光源,以p-亚硝基-N,N-二甲基苯胺(PNDA)作为·OH自由基的探针,研究了H2O2及表面活性剂0206-B(苯乙烯苯酚聚氧乙烯醚和十二烷基苯磺酸钙混剂)对除草剂乙草胺在水中间接光解作用的影响.结果表明,H2O2对水中乙草胺具有光敏化降解作用,其敏化作用效应与·OH有关;而0206-B对乙草胺具有光猝灭降解作用,光猝灭降解作用效应与0206-B减少水溶液中的·OH自由基含量有关.乙草胺直接光解与H2O2作用的乙草胺间接光解相同的产物有Rf(比移值)为0.12、0.52、0.61、0.72的化合物;H2O2敏化降解抑制了乙草胺直接光解产物Rf为0.04、0.10、0.18、0.21、0.79的化合物产生,但促进乙草胺间接光解Rf为0.45、0.66的新光解产物生成.
Isolation, identification and degradation-efficiency measurement of chlorpyrifos degradaing bacteria

WU Xiangwei,HUA Rimao,CAO Haiqun,TANG Feng,LI Xuede,YUE Yongde,

环境科学学报 , 2006,
Abstract: 取毒死蜱废水处理系统出口处的污泥进行驯化培养,分离出能降解毒死蜱的3株高效降解菌株B、D1和D3,对降解效果最好的D3菌株经中科院微生物研究所鉴定为玫瑰红红球菌(Rhodococcus rhodochrous);3株菌株的生长情况及对毒死蜱的降解动力学研究表明,B菌株在第3天繁殖增量达到最大,D1、D3菌株在第4天繁殖增量达到最大,B、D1和D3菌株的最适宜生长温度都是在30℃;采用10 mg·L-1毒死蜱作为唯一碳源时,B、D1和D3菌株对毒死蜱的降解速率分别为0.0543、0.0479和0.0620 h-1;对于浓度为10 mg·L-1的毒死蜱,D3菌投入的初始菌量OD223为0.4是最适宜的;D3菌对不同初始浓度的毒死蜱降解表明,初始浓度增大,降解速率降低,半衰期延长.
Simple Random Sampling-Based Probe Station Selection for Fault Detection in Wireless Sensor Networks
Rimao Huang,Xuesong Qiu,Lanlan Rui
Sensors , 2011, DOI: 10.3390/s110303117
Abstract: Fault detection for wireless sensor networks (WSNs) has been studied intensively in recent years. Most existing works statically choose the manager nodes as probe stations and probe the network at a fixed frequency. This straightforward solution leads however to several deficiencies. Firstly, by only assigning the fault detection task to the manager node the whole network is out of balance, and this quickly overloads the already heavily burdened manager node, which in turn ultimately shortens the lifetime of the whole network. Secondly, probing with a fixed frequency often generates too much useless network traffic, which results in a waste of the limited network energy. Thirdly, the traditional algorithm for choosing a probing node is too complicated to be used in energy-critical wireless sensor networks. In this paper, we study the distribution characters of the fault nodes in wireless sensor networks, validate the Pareto principle that a small number of clusters contain most of the faults. We then present a Simple Random Sampling-based algorithm to dynamic choose sensor nodes as probe stations. A dynamic adjusting rule for probing frequency is also proposed to reduce the number of useless probing packets. The simulation experiments demonstrate that the algorithm and adjusting rule we present can effectively prolong the lifetime of a wireless sensor network without decreasing the fault detected rate.
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