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Now showing items 1 - 5 of 5

  • [IEEE 2015 International Symposium on Educational Technology (ISET) - Wuhan, China (2015.7.27-2015.7.29)] 2015 International Symposium on Educational Technology (ISET) - A General Framework for Designing and Implementing Unicursal Games for Children

    Fan, Lipeng   Pang, Mingyong   Cheng, Ruimeng  

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  • Nitrogen-Doped Carbon Quantum Dots-Decorated Mg-Al Layered Double Hydroxide-Supported Gold Nanocatalysts for Efficient Base-Free Oxidation of Benzyl Alcohol

    Guo, Yujing   Fan, Lipeng   Liu, Mengran   Yang, Lan   Fan, Guoli   Li, Feng  

    A nitrogen-doped carbon quantum dots (NCDs)-decorated Mg-Al layered double hydroxide (MgAI-LDH)-supported gold nanoparticle (NP) was employed in the aerobic oxidation of benzyl alcohol under solvent-free and base-free conditions. Comprehensive characterizations revealed that the decoration of NCDs improved surface basicity of NCD/MgAl-LDH and was beneficial to the stabilization of gold NPs. Compared with MgAI-LDH-supported gold catalyst, Au/NCD/MgAl-LDH showed much better catalytic activity, along with a turnover frequency of about 20 175 h(-1) for benzyl alcohol conversion. The promoted catalytic efficiency of the NCD/MgAl-LDH-supported Au catalyst was mainly correlated with unique cooperation between surface hydroxyl arrays at the brucite-like lattice of MgAI-LDH matrix and highly dispersed NCDs, thereby favoring the adsorption and activation of alcohol hydroxyls. Furthermore, compared with Au/MgAl-LDH, Au/NCD/MgAl-LDH showed better structural stability due to the strong Au NCDs interactions. The primary finding opens a promising approach to develop other highly efficient metal-based catalysts applied in various base-catalyzed heterogeneous reactions.
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  • Early eclosion of overwintering cotton bollworm moths from warming temperatures accentuates yield loss in wheat

    Ouyang, Fang   Hui, Cang   Men, XinYuan   Zhang, YongSheng   Fan, Lipeng   Shi, Peijian   Zhao, Zihua   Ge, Feng  

    Understanding and predicting the impact of climate change on population demography, biotic Interactions and ecosystem service is central to ecology. Long-term time series analysis of insect populations is crucial for analyzing the 'effect of climate change on plant-insect interactions in agro-ecological systems; yet such data are often lacking. Here, based on field experiments and the long-term time series of the overwintering adult cotton bollworm Helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae) collected since 1975, we investigate the dynamic trend of H. armigera, as well as its driving forces and effects on the recruitment of H. armigera and crop yield. Results illustrated a shift to early eclosion of diapausing pupae due to global warming, extending the duration and abundance of adults in the overwintering generation. This then led to more larvae recruited in the first generation, and consequently damages the wheat at early growing stages. Our results suggest that the asynchronous effects of rising global surface temperature on the relative growth rate of spring crops and insect pests could intensify in the future, causing accentuated crop yield loss. To mitigate the adverse herbivore-mediated effect on crop yield in a warming climate, efficient cultivation measures and pest management are necessary, such as planting precocious crops with short growth period and timely control of insect pests. (C) 2015 Elsevier B.V. All rights reserved.
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  • Performance of feeding Artemia with bioflocs derived from two types of fish solid waste

    Yao, Miaolan   Tan, Hongxin   Fan, Lipeng   Meng, Haoyan  

    The production of bioflocs with the solid waste from recirculating aquaculture systems (RAS) and feeding Anemia results in additional nutrient retention and lowers waste discharged from RAS. The solid waste from the drumfilters of two RAS, which stocked European eel (Anguilla anguilla) and Nile tilapia (Oreochromis niloticus), was used as substrate to produce bioflocs in suspended growth reactors, referred to as E-flocs and T-flocs, respectively. Mono-diets consisting of 100% E-flocs and 100% T-flocs were added to culture Anemia, referred as E-Artemia and T-Artemia, respectively, in a laboratory scale test. The efficiency of this feeding regime was investigated. A significant difference was observed in terms of crude protein content (35.59 +/- 0.2%) for E-flocs, (29.29 +/- 0.95)% for T-flocs, (70.01 +/- 0.92)% for E-Artemia and (65.63 +/- 0.89)% for T-Artemia. 134 out of the total operational taxonomic units (OTUs) were present in E-flocs and T-flocs from the analysis of high-throughput sequencing data. Most of the shared OTUs belonged to cyanobacteria. C18:1n7 of T-flocs was higher than that of E-flocs (P < 0.05). C18:2n6 of E-flocs was significantly higher than that of T-flocs (P < 0.05). No significant difference was observed in the other fatty acid compositions (P > 0.05). The survival rate of E-Artemia was (22 +/- 0.02) %, significantly higher than that of T -Anemia (16% + 0.02%) (P < 0.05). No significant difference was observed between the average body weight of E-Artemia (2.38 +/- 0.40 mg) and E-Artemia (2.91 +/- 0.21) (P > 0.05). The EPA of Anemia fed with E-flocs was (3.00 +/- 0.46)%, significantly higher than that of T-Anemia (1.57 +/- 0.19%) (P < 0.05). This study offers a method for reusing the aquaculture waste, which will be helpful to achieve a zero-pollution discharge for aquaculture systems.
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  • Simultaneous determination of five quinoxaline-1,4-dioxides and two major metabolites in surface water by on-line solid phase extraction coupled to high-performance liquid chromatography

    Duan, Zhenjuan   Fang, Guozhen   Pan, Mingfei   Yi, Jianghua   Fan, Lipeng   Liu, Wei   Wang, Shuo  

    Veterinary antibiotics are environmental contaminants of recent concern, so this study was designed to develop an analytical method of simultaneous determination for quinoxaline-1,4-dioxides (QdNOs) and their metabolites in the aqueous environment at trace levels. The new method is based on on-line solid phase extraction (SPE) using cigarette filter (CGFR) as the sorbent coupled to high-performance liquid chromatography (HPLC). Five QdNOs (carbadox, olaquindox, cyadox, mequindox, quinocetone) and two major metabolites (quinoxaline-2-carboxylic acid and methyl-3-quinoxaline-2-carboxylic acid) were detected in the surface water. The cleaned CGFR precolumn selectively retained target analytes when untreated water samples were upload by a flow-inject pump. Then the enriched extracts were subsequently eluted by HPLC mobile phase to the analytical column for chromatographic analysis. The on-line setup was uncomplicated and automated. The on-line SPE conditions were optimized in detail including sample pH, sample loading flow rate, sample volume, eluent, elution time and sorbents. Under the optimal experimental conditions, the enrichment factors were 33.3-630.0 by preconcentrating 25.0 mL of water samples. Limits of detection (S/N = 3) ranged from 1.6 to 24.3 ng L(-1). Satisfactory recoveries were obtained and ranged from 87.1 to 107.5% at two spiked levels in real water samples with high precision (RSD, 1.3-3.8%). The on-line SPE-HPLC method is simple, rapid, reliable, sensitive and could be applied for multiresidue determination of the QdNOs and their metabolites in water samples.
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