Entity

Time filter

Source Type


Wei S.,Anyang University, China | Wang S.,Anyang University, China | Zhang Y.,Henan University of Urban Construction | Zhou M.,Donghua University
Sensors and Actuators, B: Chemical | Year: 2014

Different morphologies of ZnO nanomaterials (long nanofibers, rod-like short nanofibers and nano-powders) were successfully synthesized by electrospinning process and chemical precipitation, respectively. A comparative ethanol sensing study among the three samples were also performed. The results indicate that the ZnO long nanofiber sensor shows desirable response to ethanol at 270 C with good stability, which is attributed to the long nanofiber structures. This sample also presents good selectivity and fast response-recovery properties (7-9 and 9-11 s, respectively). The ethanol sensing mechanism and the advantages of the long nanofiber structure in sensing materials were also discussed. © 2013 Elsevier B.V. Source


Jin H.X.,Zhejiang University | Chen H.Y.,Henan University of Urban Construction
Journal of Chemical and Engineering Data | Year: 2012

Densities for 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF 4)-glucose-water solutions were determined at 298.15 K. The measured densities were used to calculate the apparent molar volumes of glucose (V Φ,S) and [Bmim]BF 4 (V Φ,IL) in the studied solutions. Infinite dilution apparent molar volumes, V Φ,S ∞ and V Φ,IL ∞, have been evaluated, together with the standard transfer volumes of the sucrose (Δ tV S ∞) from water to aqueous solutions of [Bmim]BF 4 and those of [Bmim]BF 4 (Δ tV IL ∞) from water to aqueous glucose solution. It was shown that the Δ tV S ∞ and Δ tV IL ∞ values are positive and increase with increasing molalities of [Bmim]BF 4 and glucose, respectively, and the values of V Φ,S ∞ have the order of glucose < sucrose. The volumetric interaction parameters for [Bmim]BF 4-glucose pairs in water were also obtained and interpreted by the structural interactions model. © 2012 American Chemical Society. Source


Wang N.,Henan University of Urban Construction
Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry | Year: 2011

The reaction of [VO(acac)2] with 3-methyl-N'-[1-(2- hydroxynaphthyl)ethylidene]benzohydrazide (H2L1) and 3-methyl-N'-[(2-hydroxy-1-naphthyl)methylidene]benzohydrazide (H 2L2), respectively, in methanol affords two new oxovanadium(V) complexes, [VO(OMe)L1]2 (1) and [VO(OMe)(HOMe)L2] (2). Both complexes have been characterized by elemental analysis, I.R., and single crystal X-ray diffraction methods. Complex (1) is a methoxide-bridged dinuclear oxovanadium(V) compound, while complex (2) is a mononuclear oxovanadium(V) compound. The dinegative hydrazone ligands coordinate to the metal atoms through phenolate, imine, and deprotonated amine donor atoms. The geometry around each vanadium atom is a distorted VNO5 octahedron in both complexes. Copyright © Taylor & Francis Group, LLC. Source


Jin H.X.,Zhejiang University | Chen H.Y.,Henan University of Urban Construction
Journal of Chemical and Engineering Data | Year: 2011

Densities for 1-allyl-3-methylimidazolium chloride ([Amim]Cl)-sucrose-water solutions were measured at 298.15 K. These data were used to calculate the apparent molar volumes of sucrose (V φ,S) and [Amim]Cl (V φ,IL) in the studied solutions. Infinite dilution apparent molar volumes, V φ,S 0 and V φ,IL 0, were also obtained, together with the standard transfer volumes of the sucrose (Δ tV S 0) from water to aqueous solutions of [Amim]Cl and those of [Amim]Cl (Δ tV IL 0) from water to aqueous sucrose solution. Additionally, the system studied here was compared with 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF 4)-sucrose-water mixture. It was shown that the Δ tV S 0 and Δ tV IL 0 values are positive and increase with increasing molalities of ILs and sucrose, respectively, and the Δ tV S 0 and Δ tV IL 0 values have the order of [Amim]Cl > [Bmim]BF 4. Additionally, the volumetric interaction parameters for ionic liquid (IL)-sucrose pairs in water were also obtained and interpreted by the structural interactions model. © 2011 American Chemical Society. Source


Wang B.,Henan University of Urban Construction
Chinese Journal of Mechanical Engineering (English Edition) | Year: 2010

As two independent problems, scheduling for parts fabrication line and sequencing for mixed-model assembly line have been addressed respectively by many researchers. However, these two problems should be considered simultaneously to improve the efficiency of the whole fabrication/assembly systems. By far, little research effort is devoted to sequencing problems for mixed-model fabrication/assembly systems. This paper is concerned about the sequencing problems in pull production systems which are composed of one mixed-model assembly line with limited intermediate buffers and two flexible parts fabrication flow lines with identical parallel machines and limited intermediate buffers. Two objectives are considered simultaneously: minimizing the total variation in parts consumption in the assembly line and minimizing the total makespan cost in the fabrication/assembly system. The integrated optimization framework, mathematical models and the method to construct the complete schedules for the fabrication lines according to the production sequences for the first stage in fabrication lines are presented. Since the above problems are non-deterministic polynomial-hard(NP-hard), a modified multi-objective genetic algorithm is proposed for solving the models, in which a method to generate the production sequences for the fabrication lines from the production sequences for the assembly line and a method to generate the initial population are put forward, new selection, crossover and mutation operators are designed, and Pareto ranking method and sharing function method are employed to evaluate the individuals' fitness. The feasibility and efficiency of the multi-objective genetic algorithm is shown by computational comparison with a multi-objective simulated annealing algorithm. The sequencing problems for mixed-model production systems can be solved effectively by the proposed modified multi-objective genetic algorithm. © 2010 Chinese Journal of Mechanical Engineering. Source

Discover hidden collaborations