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Liu Y.,Guangxi Normal University | Liang Y.,Guangxi Normal University | Lian H.,Guangxi Normal University | Zhang C.,Guangxi Normal University | And 2 more authors.
International Journal of Electrochemical Science | Year: 2014

The electrolytic manganese dioxide - graphene (EMDG) composite was used in the construction of a sensor, which showed strong electrocatalytic activity to the oxidation of vanillin in neutral solutions. Vanillin produces an anodic peak at about 0.67 V at this electrode. Several electrochemical parameters of these processes were further carefully calculated with the results of the charge transfer coefficient a as 0.703 and the electron transferred number n as 2. The electrocatalytic behavior was further exploited as a sensitive detection scheme for the vanillin determination by differential-pulse voltammetry (DPV). Under optimized conditions, the anodic peak current increased linearly with the vanillin concentration over the range from 1.0×10-7 to 4.5×10-5 mol L-1. The detection limit was calculated as 3.2×10-8 mol L-1 (S/N=3). The proposed method was applied to the detection of biscuits and chocolates samples with satisfactory results. © 2015 The Authors.

Jiang Y.,Guangxi University | Chen W.-H.,Guangxi University | Chen W.-H.,Guangxi Colleges and Universities | Luo S.,Guangxi University
Chinese Control Conference, CCC | Year: 2015

In this paper, we consider the stabilization problem of stochastic delayed neural networks (SDNNs) via periodically intermittent control. Based on a time-varying piecewise Lyapunov functional approach, a mean-square exponential stability criterion for the intermittently controlled SDNNs is firstly obtained and formulated in the form of linear matrix inequalities (LMIs). The relationship among the control period, the control width, and the upper bound on time-delay is built. Then, a sufficient condition on the existence of periodically intermittent state-feedback controllers is derived by employing the obtained stability criterion. The controller gains can be designed by solving a set of LMIs. Finally, a illustrated example is given to show the effectiveness of the proposed intermittent control method. © 2015 Technical Committee on Control Theory, Chinese Association of Automation.

Wu X.,Guangxi University | Wu W.,Guangxi University | Wu W.,Guangxi Colleges and Universities | Zhou Y.,Guangxi University | And 3 more authors.
Powder Technology | Year: 2015

The SnO2-Fe2O3 composite is synthesized by a hydrothermal method in ethanol-water solution. When evaluated as anode materials for Na-ion battery, the SnO2-Fe2O3 composite sample obtained at 400°C could deliver a discharge capacity of 313.1mAhg-1 after the 30th cycle at 25mAg-1, which corresponds to 104.5% of the 2nd discharge capacity. Coulombic efficiency is 95% in the 30th cycle. At the same time, SnO2-Fe2O3 composite is also an excellent anode material for Li-ion battery, which can deliver initial discharge and charge capacities of 1643 and 1120mAhg-1 at 200mAg-1, respectively. Such excellent performance is a result of the formation of mesopores and large specific surface area of the SnO2-Fe2O3 composite. © 2015 Elsevier B.V.

Wu X.,Guangxi University | Wu W.,Guangxi University | Wu W.,Guangxi Colleges and Universities | Qin L.,Guangxi University | And 4 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2015

La3+-doped Ni-Zn ferrites with a nominal composition of Ni0.5Zn0.5LaxFe2-xO4 (where x=0-0.3) are prepared by solid-state reaction at low temperatures. X-ray diffraction data shows that single phase Ni0.5Zn0.5Fe2O4 is obtained at 600°C, but all samples consist of the main spinel phase in combination of a small amount of a foreign LaFeO3 phase after doping. When the precursor is calcined at 900°C, the lattice constants of the ferrites initially increase after La3+ doping, but then become smaller with additional La3+ doping. The addition of La3+ results in a reduction of crystallite size. Magnetic measurement reveals that the specific saturation magnetization (Ms) of the as-prepared ferrites decreases with increasing La3+ substitution, while the coercivity (Hc) of Ni0.5Zn0.5LaxFe2-xO4 obtained above 800°C increases with increasing La3+ substitution. © 2014 Published by Elsevier B.V.

Chen W.,Guangxi University | Wu W.,Guangxi University | Wu W.,Guangxi Colleges and Universities | Liu S.,Guangxi University | And 5 more authors.
Materials Science in Semiconductor Processing | Year: 2015

Co0.5Mn0.5-xNixFe2O4 (0.0≤x≤;0.3) precursor is obtained by solvothermal method at 160 °C in glycol-water. Cubic Co0.5Mn0.5-xNixFe2O4 is obtained by calcining the precursor from 600 °C to 800 °C in air. The precursor and its calcined products are characterized by thermogravimetry and differential scanning calorimetry, X-ray powder diffraction, scanning electron microscopy, and vibrating sample magnetometer. A high-crystallized rod-like Co0.5Mn0.5-xNixFe2O4 with a cubic structure is obtained when the precursor is calcined at 800 °C in air for 2 h. Lattice parameters decrease with the increase of Ni2+ addition amount. The magnetic properties of Co0.5Mn0.5-xNixFe2O4 depend on Ni2+ doped amount and calcination temperature. Co0.5Mn0.3Ni0.2Fe2O4 obtained at 800 °C has the highest specific saturation magnetization value, 63.51 emu/g. However, Co0.5Mn0.3Ni0.2Fe2O4 obtained at 600 °C has the highest coercivity value, 1204.02 Oe. © 2015 Elsevier Ltd.

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