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Liu H.,Shaoyang University
RISTI - Revista Iberica de Sistemas e Tecnologias de Informacao | Year: 2016

After the 2008 global financial tsunami, domestic and foreign academia, government agencies and regulatory authorities are actively coping, with more and more financial institutions in our country, the relationship between each other more and more closely, the system of financial supervision has become more difficult. In order to better understand and analyze the role of banks in the system of financial risk, on the basis of clarifying the systemic risk, systemic risk contribution and the importance of the system, the systematic risk transmission mechanism and influencing factors are studied by using the method of systematic expectation loss and marginal expected loss of Acharya to make a quantitative empirical analysis.

Liu Y.,University for Business Studies | Liu X.,Shaoyang University
Mathematical Methods in the Applied Sciences | Year: 2013

Sufficient conditions for the existence of at least one periodic solution of two classes of nonlinear higher order periodic difference equations are established, respectively. The results show us that sufficient conditions for the existence of T - periodic solutions of difference equation are different from those ones for the existence of T - periodic solutions of differential equation. Copyright © 2012 John Wiley & Sons, Ltd. Copyright © 2012 John Wiley & Sons, Ltd.

Du C.,Shaoyang University | Huang W.,Guilin University of Electronic Technology
Nonlinear Dynamics | Year: 2013

The problem of limit cycles for the Kolmogorov model is interesting and significant both in theory and applications. In this paper, we investigate the center-focus problems and limit cycles bifurcations for a class of cubic Kolmogorov model with three positive equilibrium points. The sufficient and necessary condition that each positive equilibrium point becomes a center is given. At the same time, we show that each one of point (1,2) and point (2,1) can bifurcate 1 small limit cycles under a certain condition, and 3 limit cycle can occur near (1,1) at the same step. Among the above limit cycles, 4 limit cycles can be stable. The limit cycles bifurcations problem for Kolmogorov model with several positive equilibrium points are hardly seen in published references. Our result is new and interesting. © 2012 Springer Science+Business Media Dordrecht.

Liang G.,Central South University | Liang G.,Shaoyang University | Zhou J.,Central South University | Huang X.,Central South University
Applied Energy | Year: 2011

The paper studied the performances of parallel thermoelectric generator (TEG) by theoretical analysis and experimental test. An analytical model of parallel TEG was developed by theoretical analysis and calculation, based on thermodynamics theory, semiconductor thermoelectric theory and law of conservation of energy. Approximate expressions of output power and current of parallel TEG were deduced by the analytical model. An experimental system was built to verify the model. The results indicate that only when all of the thermoelectric modules (TE modules) in the parallel TEG have the same inherent parameters and working conditions, the parallel properties of the TEG are the same as that of common DC power. The existence of contact resistance is just like the increase of the TE module's internal resistance, which leads to the deceases of output power. The thermal contact resistance reduces the output power by reducing the temperature difference between the two sides of the thermocouples. The results derived from the model are basically consistent with the experimental results, the model is suitable for the performance researching and designing of parallel TEG. © 2011 Elsevier Ltd.

Li H.,Shaoyang University | Zeng Y.,Shaoyang University | Huang T.,Shaoyang University | Piao L.,CAS National Center for Nanoscience and Technology | And 2 more authors.
Chemistry - A European Journal | Year: 2012

Hierarchical TiO 2 nanospheres with controlled surface morphologies and dominant {001} facets were directly synthesized from Ti powder by a facile, one-pot, hydrothermal method. The obtained hierarchical TiO 2 nanospheres have a uniform size of 400-500 nm and remarkable 78 % fraction of {001} facets. The influence of the reaction temperature, amount of HF, and reaction time on the morphology and the exposed facets was systematically studied. A possible growth mechanism speculates that Ti powder first dissolves in HF solution, and then flowerlike TiO 2 nanostructures are formed by assembly of TiO 2 nanocrystals. Because of the high concentration of HF in the early stage, these TiO 2 nanostructures were etched, and hollow structures formed on the surface. After the F - ions were effectively absorbed on the crystal surfaces, {001} facets appear and grow steadily. At the same time, the {101} facets also grow and meet the {101} facets from adjacent truncated tetragonal pyramids, causing coalescence of these facets and formation of nanospheres with dominant {001} facets. With further extension of the reaction time, single-crystal {001} facets of hierarchical TiO 2 nanospheres are dissolved and TiO 2 nanospheres with dominant {101} facets are obtained. The photocatalytic activities of the hierarchical TiO 2 nanospheres were evaluated and found to be closely related to the exposed {001} facets. Owing to the special hierarchical architecture and high percentage of exposed {001} facets, the TiO 2 nanospheres exhibit much enhanced photocatalytic efficiency (almost fourfold) compared to P25 TiO 2 as a benchmark material. This study provides new insight into crystal-facet engineering of anatase TiO 2 nanostructures with high percentage of {001} facets as well as opportunities for controllable synthesis of 3D hierarchical nanostructures. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Xu J.,Shaoyang University
Yadian Yu Shengguang/Piezoelectrics and Acoustooptics | Year: 2012

The effects of B 2O 3 with w=0.5% to 3.0% on the structure and microwave properties of Ba(Mg 1/3Ta 2/3)O 3(BMT) ceramic has been investigated. It has been found that B 2O 3 doping can improve the BMT microwave ceramic sintering. When w(B 2O 3) is equal to 1%, the densification sintering temperature of BMT ceramic has been reduced to 1200°C, the apparent density ρ is equal to 7306 g/cm 3, the relative density is 95.7%. The BMT microwave ceramic system has good microwave dielectric properties as follows: ε r=22.08, the quality factor Q·f =88 000 GHz(10 GHz), the coefficient of frequency to temperature τ f =3.3×10 -6/°C.

Tang A.Y.,Shaoyang University
Advanced Materials Research | Year: 2014

The research analysis about the current situation of ollege aerobics information resource construction, pointing out the drawbacks about college aerobics information resources construction under the current web environment and proposes the strategy about how to construct college aerobics information resources under the Network Environment. This article includes the principles and feasibility of college aerobics information resources construction under network environment, and put forward our own ideas about the strategy of college aerobics information resources construction under network environment. © (2014) Trans Tech Publications, Switzerland.

Xu J.,Shaoyang University
WIT Transactions on Information and Communication Technologies | Year: 2014

We proposed to filter SMS spam on an independent mobile phone using Naïve Bayes and Word Occurrences table. Our proposed approach does not depend on another computer system for support or a large amount of data in advance while obtaining reasonable accuracy, low storage consumption, and acceptable processing time. Our proposed approach ensures security and privacy because spammers do not have a chance to get the filtering system and users do not have to store SMS to anywhere. We also found that performance based approach can be used to reduce the number of words in the word occurrences table significantly without reducing accuracy significantly. © 2014 WIT Press.

The development of rural e-commerce is a gradual process involving various factors, among which the application of information technology for the role of government is of great importance. Rural e-commerce in China is lagging behind compared with the developed countries. As a kind of basic public service, rural e-commerce has strong positive externality. Government at different levels have to share the responsibility in terms of capital input, financial aid, tax policy and legal support. © (2014) Trans Tech Publications, Switzerland.

Qiu X.,Shaoyang University | Lin T.,Shaoyang University
Journal of Nanomaterials | Year: 2015

Herein, a series of KGdF4:Yb3+/Er3+ upconversion nanoparticles (UCNPs) were synthesized through a one-pot hydrothermal method using polyethylene glycol (PEG) as capping ligands. The phase and microstructure studies show all these as-prepared UCNPs are pure cubic phase and uniformed nanoparticle shape by changing the doped Yb3+ concentration from 18% to 98%. The as-prepared UCNPs can realize the multicolor emissions from yellow to red and the red-to-green (R/G) ratio can be enhanced from 2.05 to 8.35 when Yb3+ varies from 18% to 98%. In addition, the proposed upconversion (UC) mechanisms of these PEGylated UCNPs are investigated in detail. The realization of multicolor tuning and enhanced R/G ratio by only increasing the doping concentration of Yb3+ ions in KGdF4 host indicates that the PEGylated KGdF4:Yb3+/Er3+ UCNPs can find their application on lighting devices, anticounterfeit technology, and even bioimaging field. © 2015 Xionger Qiu and Tiejun Lin.

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