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Nanlu, China

Li C.,South-Central University for Nationalities | Wang Z.,Qinzhou University | Zhan G.,South-Central University for Nationalities
Colloids and Surfaces B: Biointerfaces

A gold/sodium dodecylbenzene sulfonate nanoparticles modified glassy carbon electrode (nano-Au/SDBS/GCE) was electrochemically fabricated with a constant potential at -0.4V. The obtained nano-Au/SDBS/GCE was characterized with scanning electronic microscopy, X-ray photoelectron spectroscopy and electrochemical techniques. Electrochemical behaviors of methyl parathion at the nano-Au/SDBS/GCE were thoroughly investigated. Compared to the unmodified electrode, the peak current obviously increased and the oxidation peak potential negatively shifted. These changes indicated that the composite nanoparticles possess good electrocatalytic performance on the electrochemical reaction of methyl parathion. Experimental parameters such as deposition time, pH value and accumulation conditions were optimized. Under optimum conditions, the peak current corresponding to the oxidation of the hydroxylamine group was found in a good linear relationship with the methyl parathion concentration. In addition, a calibration curve with excellent linearity was obtained in the concentration range from 5.0×10-7molL-1 to 1.0×10-4molL-1 with an estimated detection limit of 8.6×10-8molL-1 (S/N=3). The successful determination of methyl parathion in real samples demonstrated the usefulness and potential applications of this method. © 2010. Source

Liang J.,Qinzhou University
Procedia Engineering

For path planning problem of mobile robot in a known three-dimensional (3D) environment, proposed a path planning algorithm. Firstly, rasterize the known three-dimensional environment. Established the running costs estimate model for the grids from starting point to the target. Using the model to estimate the running costs for each grid. Then used A * search algorithm to calculate the grid path from starting to target with lowest running costs. By detectives of mobile robot, we planned an optimum path under the constraints of grids using hill climbing algorithm. Simulated results show that the algorithm can reduce the uphill or downhill times and running costs improve security, avoid the problem of local minimum. It is simple and robustness. © 2011 Published by Elsevier Ltd. Source

Chen X.,South-Central University for Nationalities | Ren T.,South-Central University for Nationalities | Ma M.,Ningbo Entry Exit Inspection and Quarantine Bureau | Wang Z.,Qinzhou University | And 2 more authors.
Electrochimica Acta

Using carboxylic acid-functionalized single walled carbon nanotubes (SWCNTs-COO-) as an anion and3-butyl-1-[3-(N-pyrrolyl)propyl]imidazolium as a cation, a novel SWCNTs-COO-ionic liquid (SWCNTs-COO-IL) nanocomposite was fabricated successfully. The as-prepared SWCNTs-COO-IL nanocompositewas confirmed with transmission electron microscopy, X-ray photoelectron spectroscopy, UV-vis,FTIR and Raman spectroscopy. The SWCNTs-COO-IL nanocomposite was coated onto a glassy carbonelectrode surface followed by cyclic voltammetric scanning to fabricate a SWCNTs/poly{3-butyl-1-[3-(N- pyrrolyl)propyl] imidazolium ionic liquid} composite film modified electrode (SWCNTs/Poly-IL/GCE).Scanning electron microscope and electrochemical impedance spectroscopy were used to characterizeSWCNTs/Poly-IL/GCE. Electrochemical behaviors of bisphenol A (BPA) at the SWCNTs/Poly-IL/GCE wereinvestigated thoroughly. It was found that an obvious oxidation peak appeared without reduction peakin the reverse scanning, indicating an irreversible electrochemical process. The oxidation peak currentsof BPA were linearly related to scan rate in the range of 20-300 mV s-1, suggesting an adsorption con-trolled process rather than a diffusion controlled process. Differential pulse voltammetry was employedfor the voltammetric sensing of BPA. Experimental conditions such as film thickness, pH value, accu-mulation potential and time that influence the analytical performance of the SWCNTs/Poly-IL/GCE wereoptimized. Under optimal conditions, the oxidation peak current was linearly related to BPA concentra-tion in the range of 5.0 × 10-9to 3.0 × 10-5mol L-1with a detection limit of 1.0 × 10 -9mol L-1(S/N = 3).The developed method was successfully employed for the determination of BPA leaching from plasticdrinking bottle. © 2013 Elsevier Ltd. Source

Che X.Y.,Qinzhou University
Applied Mechanics and Materials

This paper firstly analyzes the information flow and logistics factors and establish an integrated information flow based on interface and general framework of logistics integration model, to build VMI & TPL mode integrated information flow and logistics system dynamics model. From logistics integrated subsystems, information flow integrated subsystems, coordination and control subsystem and risk analysis information flow and logistics subsystem integrated system architecture, and analyze various subsystems within the relationship between the various factors, we come to each subsystem causal diagram. Thus establishing an integrated information flow and logistics system model Article demonstrates the implementation of VMI supply chain model brings improvement in the overall economic effect, get a lot of useful conclusions with a wide range of uses. © (2013) Trans Tech Publications, Switzerland. Source

Xu S.-Q.,Qinzhou University
Acta Crystallographica Section E: Structure Reports Online

In the title compound, C14H12N4O 3, the dihedral angle between the benzene rings is 7.6 (4)°. In the crystal, infinite sheets linked by N - H⋯O and bifurcated N - H⋯(O,N) hydrogen bonds propagate in the (10-1) plane, in which R 4 4(36) loops are apparent. Neighbouring layers may inter-act by way of very weak π-π stacking inter-actions [centroid-centroid distances = 3.9329 (13) and 4.0702 (13) Å]. © Shu-Qing Xu 2012. Source

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