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Du C.,Shaoyang University | Wang Q.,Hezhou University | Huang W.,Guilin University of Electronic Technology
International Journal of Bifurcation and Chaos | Year: 2014

We study the Hopf bifurcation for a class of three-dimensional cubic Kolmogorov model by making use of our method (i.e. singular values method). We show that the positive singular point (1, 1, 1) of an investigated model can become a fine focus of 5 order, and moreover, it can bifurcate five small limit cycles under certain coefficients with disturbed condition. In terms of three-dimensional cubic Kolmogorov model, published references can hardly be seen, and our results are new. At the same time, it is worth pointing out that our method is valid to study the Hopf bifurcation problem for other three-dimensional polynomial differential systems. © 2014 World Scientific Publishing Company.

Hu Y.,Hezhou University
Journal of Chromatography B: Analytical Technologies in the Biomedical and Life Sciences | Year: 2015

A method of capillary electrophoresis (CE) coupled with electrochemiluminescence (ECL) detection has been applied to detect three major phenylurea herbicides (monuron, monolinuron and diuron) simultaneously. The effects of yam sample preparation, injection voltage and time, detection potential, detection buffer concentration and pH, Ru(bpy)3 2+ concentration, separation buffer type, separation buffer pH and concentration, separation voltage were investigated in detail. Under optimum conditions, a good baseline separation and highly sensitive detection for monuron, monolinuron and diuron were achieved. The ECL intensity (I) was in proportion to three analytes concentration (ρ) in the range of 0.1-10,000μg/L for monuron (r≥0.9993), 0.1-18,000μg/L for monolinuron (r≥0.9995) and 0.1-20,000μg/L for diuron (r≥0.9997). The detection limits for monuron, monolinuron and diuron were 0.05, 0.04 and 0.01μg/L (S/N=3), respectively. The developed method was successfully applied for the analysis of monuron, monolinuron and diuron residues in yam simultaneously. The average recoveries are in the ranges of 90.0-99.2% with relative standard deviations less than 3.2%. The limits of detection of the proposed method were 0.010μg/kg for monuron, 0.008μg/kg for monolinuron and diuron in yam. © 2015 Elsevier B.V.

Liang B.,Hezhou University
Advanced Materials Research | Year: 2011

Fe3O4/chitosan magnetic nanoparticles were prepared by chemical cross-linking technique, using dialdehyde starch as a crosslinker, and the adsorption performance of the adsorbent toward Hg2+ was investigated. The adsorption capacity of mercury ions was greatly affected by pH value, adsorption doses and adsorption time. Results indicated that optimal adsorption conditions were pH value, 6, adsorption doses, 140 mg.L-1, adsorption time, 20 min, and the adsorption capacity was 25.12 mg.g -1. The well-defined nanoparticles with a uniform distribution were observed. © (2011) Trans Tech Publications, Switzerland.

Li S.Y.,Hezhou University
Applied Mechanics and Materials | Year: 2014

Gear vibration analysis and gear fault diagnosis are related to the multi-objective decision-making process of machinery equipment production, in which a large amount of data and information should be collected, and the relationship between supply/demand needs and available resources, between production and labor, and between enterprise benefit and social benefit should be balanced generally. Thus, the gear fault diagnosis technologies as well as the professional quality and technical quality are required to be very high. To conform to the forward development of mathematical modeling technology, it is urgent to implement safety product management with computer by using gear vibration analysis and gear fault diagnosis as methods for aiding the research and development of machinery gear fault diagnosis system. © (2014) Trans Tech Publications, Switzerland.

Jiang W.,Hezhou University
Applied Mechanics and Materials | Year: 2014

According to the annual data of rural residents’ per capita net income and urban per capita disposable income throughout the country from 1978 to 2010, we used co-integration analysis to inspect the relation between them, and then established error correction model. The analysis result indicated that there was a secular stable balance relationship between rural residents’ per capita net income and urban per capita disposable income throughout the country, in which elastic coefficient was less than 1. The 22.87% deviation of rural resident’s income and long-term equilibrium value has been amended. We can utilize error correction model to predict the error between rural resident’s income from 2011 to 2013 and real data be within 1%. The model has superior prediction accuracy. © (2014) Trans Tech Publications, Switzerland.

Deng H.,Hezhou University
Advanced Materials Research | Year: 2014

In today's rapid development of network technology, network ideological and political education is becoming increasingly popular, in fact, the basic platform ideological and political education in the social networking offers, more significant is extremely important. In focusing on network brings great benefits to the ideological and political education, but also should be fully aware of the rapid development of the network to the traditional ideological and political education to bring new opportunities and challenges, and how to take effective measures to strengthen the ideological and political education network; how better to make network services in the ideological and political education in universities; how to make ideological and political education under the popular network; how to strengthen the ideological and political education network system management; how to make the network truly become the ideological and political education services, the most important way, this is a major issue of our current research and universities should be addressed. © (2014) Trans Tech Publications, Switzerland.

Zhang X.-N.,Hezhou University
Chinese Physics C | Year: 2011

In this paper, proceeding from the relation between the Cardassian model and the accelerated expansion of the universe, adopting a parametric method which does not depend on a precise mechanism for gravitational baryo/leptogenesis and using the model parameter of CPT-violating interaction, we study the role of the modified Friedmann equation which plays a role in the matter asymmetry of the early epoch and the accelerated expansion of the present universe. Thus the appropriate Cardassian component in the radiation-dominated era or in the matter-dominated universe can be obtained. The results indicate that early CPT-violation is included in the Cardassian term. In the same way, the present Cardassian term that belongs to a quintessence-like model can drive the universe towards a flat, matter-dominated and accelerating expansion. © 2011 Chinese Physical Society.

Du C.,Shaoyang University | Liu Y.,Central South University | Huang W.,Hezhou University
International Journal of Bifurcation and Chaos | Year: 2014

The problem of limit cycles for Kolmogorov model is interesting and significant both in theory and applications. Our work is concerned with limit cycles bifurcations problem for a class of quartic Kolmogorov model with two positive singular points (i.e. (1, 2) and (2, 1)). The investigated model is symmetrical with regard to y = x. We show that each one of points (1, 2) and (2, 1) can bifurcate five small limit cycles at the same step under a certain condition. Hence, the two positive singular points can bifurcate ten limit cycles in sum, in which six cycles can be stable. In terms of symmetrical Kolmogorov model, published references are less. In terms of the Hilbert Number of Kolmogorov model, our results are new. © 2014 World Scientific Publishing Company.

Zhong M.,Hezhou University
Optics Communications | Year: 2015

A broad band metamaterial absorber is designed and simulated, which constitutes by double circular-patterned metal-dielectric stacks. A absorption band is obtained from 14.1 to 16.4 THz. Electric field distributions reveal that the absorption band is obtained from localized surface plasmon (LSP) modes which are excited both on outside and inside edges of each stack, while the high-frequency absorption peak is excited by LSP modes which are excited only on outside edges. The absorption band width can be tuned by increasing the radius (R) of circular-patterned layers and reducing the thickness of dielectric layers (Hd). Moreover, the designed broad band metamaterial absorber is independent of circular-patterned dielectric layer combination. © 2015 Elsevier B.V. All rights reserved.

Pan Y.H.,Hezhou University
Applied Mechanics and Materials | Year: 2014

The calculation of basketball trajectory involves the elastic-plastic mechanics and aerodynamics theory. Besides the deformation of basketball flight, the flight is a complex fluid solid coupling process. If wanting to simulate the flight trajectory of basketball accurately, it must consider the effect of flow field and solid fluid solid coupling field. In order to calculate the flight trajectory of basketball accurately and improve basketball shooting speed and posture training efficiency in the training process, this paper uses the FLUENT to simulate the basketball flight trajectory. Combined with the aerodynamic theory we established the mathematical model of basketball flight. Through the numerical simulation we calculate the velocity field and the monitoring point deformation curve of basketball flight, it provides a new method for computer technical training for basketball players. © (2014) Trans Tech Publications, Switzerland.

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