Hubei University for Nationalities

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Enshi, China
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Thorn D.A.,State University of New York at Buffalo | Zhang C.,Hubei University for Nationalities | Zhang Y.,Research Triangle Institute | Li J.-X.,State University of New York at Buffalo
Neuroscience Letters | Year: 2014

The trace amine associated receptor (TAAR) 1 is a new G protein coupled receptor that critically modulates central dopaminergic system. Recently, several selective TAAR 1 ligands have been described to possess antipsychotic and antidepressant-like activities. However, it is unknown of the role of these ligands in modulating psychostimulant-induced neurobehavioral plasticity. This study examined the effects of a selective TAAR 1 agonist, RO5263397, on cocaine induced behavioral sensitization in rats, a rodent model of drug-induced behavioral plasticity. Daily treatment with 15. mg/kg cocaine (i.p., 7 days) induced robust locomotor sensitization in rats. RO5263397 (1-10. mg/kg, i.p.) alone did not significantly alter the locomotor activity. Acute treatment with RO5263397 (3.2 and 10. mg/kg) did not significantly modify cocaine-induced hyperactivity; however, the induction of locomotor sensitization was significantly blocked after 7 days of daily RO5263397 treatment. More importantly, the expression of locomotor sensitization remained significantly attenuated when rats were re-tested 7 days after the last drug treatment. The marked attenuation of cocaine sensitization was also evidenced by the suppression of the dose-effect function (3.2-32. mg/kg) of cocaine sensitization. Together, these data represent the first to report a critical modulatory role of TAAR 1 agonists in cocaine-induced behavioral plasticity, which may be indicative of its potential role for altering other long-lasting behavioral maladaptations of cocaine including drug addiction. © 2014 Elsevier Ireland Ltd.


Ma D.-Z.,Hubei University for Nationalities | Cao Y.,Beijing Normal University | Wu J.-P.,Beijing Normal University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2011

In this Letter we construct the Stückelberg holographic superconductor with Weyl corrections. Under such corrections, the Weyl coupling parameter γ plays an important role in the order of phase transitions and the critical exponents of second order phase transitions. So do the model parameters cα, α and c4. Moreover, we show that the Weyl coupling parameter γ and the model parameters cα, α, c4 which together control the size and strength of the conductivity coherence peak and the ratio of gap frequency over critical temperature ωg/Tc. © 2011 Elsevier B.V.


Zeng X.-X.,Chongqing Jiaotong University | Liu X.-M.,Hubei University for Nationalities | Liu W.-B.,Beijing Normal University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2015

Gravitational collapse of a shell of dust in noncommutative geometry is probed by the renormalized geodesic length, which is dual to probe the thermalization by the two-point correlation function in the dual conformal field theory. We find that the larger the noncommutative parameter is, the longer the thermalization time is, which implies that the large noncommutative parameter delays the thermalization process. We also investigate how the noncommutative parameter affects the thermalization velocity and thermalization acceleration. © 2015 The Authors.


Wu D.,Hubei University for Nationalities | Long M.,Shanghai JiaoTong University
ACS Applied Materials and Interfaces | Year: 2011

The visible-light-induced self-cleaning property of cotton has been realized by coating N-TiO 2 film and loading AgI particles simultaneously. The physical properties were characterized by means of XRD, SEM, TEM, XPS, and DRS techniques. The visible light photocatalytic activities of the materials were evaluated using the degradation of methyl orange. In comparison with TiO 2-cotton, the dramatic enhancement in the visible light photocatalytic performance of the AgI-N-TiO 2-cotton could be attributed to the synergistic effect of AgI and N-TiO 2, including generation of visible light photocatalytic activity and the effective electron-hole separations at the interfaces of the two semiconductors. The photocatalytic activity of the AgI-N-TiO 2-cotton was fully maintained upon several numbers of photodegradation cycles. In addition, according to the XRD patterns of the AgI-N-TiO 2-cotton before and after reaction, AgI was stable in the composites under visible light irradiation. Moreover, a possible mechanism for the excellent and stable photocatalytic activity of AgI-N-TiO 2-cotton under visible light irradiation was also proposed. © 2011 American Chemical Society.


Wu D.,Hubei University for Nationalities | Long M.,Shanghai JiaoTong University
Surface and Coatings Technology | Year: 2012

To extend the application of N-TiO 2 to substrates with low thermal resistance, N-TiO 2 sol has been successfully synthesized at low temperature by reflux method and N-TiO 2 coating on cotton fabrics has been successfully prepared in a dip-coating process. Several characterization tools, such as X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV-vis diffuse reflectance spectroscopy, were employed to study the phase structures, morphologies, the chemical states and optical properties of the samples. The photocatalytic properties of the prepared products were measured with the degradation of methyl orange at room temperature under visible light irradiation. In comparison with TiO 2-cotton, the remarkable enhancement in the visible light photocatalytic performance of the N-TiO 2-cotton could be attributed to the existence of N-TiO 2 with narrow band gap. The photocatalytic performances of the N-TiO 2-cotton were maintained for the cycling experiments, indicating that N-TiO 2-cotton could be used as stable and efficient visible-light-induced self-cleaning materials. © 2012 Elsevier B.V.


Li J.,Hubei University for Nationalities
Applied Mechanics and Materials | Year: 2013

For analyzing the multilayer structure of the J2EE, based on Role-Based Access Control, a model of privilege management infrastructure was designed. It was implemented after the discussion of the existing privilege management system. Moreover, the safe authority control was realized with good effect. © (2013) Trans Tech Publications, Switzerland.


In order to sweep completely the obstacle to the whole linearization of photovoltaic (PV) system with non-linear PV cell, in this paper, the voltage-current characteristic of PV cell at the maximum power point (MPP) is linearized and two linear equivalent models including Thevenin equivalent model and Norton equivalent model are proposed. On the basis of this work, the whole linearization of PV system is workable and reasonable, and then the conventional linear theories or laws can be used to study PV system conveniently. Meanwhile, in this work, the direct relationships between three linear model parameters and variable weather parameters (VWP) were found, which ensures the strong adaptation of these proposed models to the varying weather conditions. Finally, some simulation experiments verify that these proposed models are feasible and available in practical application, illustrate that the characteristics of three linear model parameters are influenced by varying weather conditions and unaffected by varying load, and show that PV system using the proposed Thevenin equivalent model has the same maximum power point tacking (MPPT) stead-state performance and similar MPPT transient-state performance with the conventional four-parameter model under fast varying weather conditions. © 2016 Elsevier Ltd


Li S.,Hubei University for Nationalities
Solar Energy | Year: 2014

In this paper, a unified model of three basic DC/DC converters is firstly proposed under certain conditions. This model is named as inductance-capacitor-diode (LCD) circuit and consisted of an inductance, a capacitor and a diode. Based on LCD circuit, a maximum power point tracking (MPPT) control strategy with variable weather parameter is proposed for photovoltaic (PV) generation systems with DC bus. In this strategy, through using LCD circuit instead of DC/DC converter, the MPPT performance of PV system is not influenced by the choice of different DC/DC converter topologies and the configuration of PV system is simplified, which makes the overall cost lower and the system integration, modularization and miniaturization more convenient. Finally, the accuracy of LCD model, and the feasibility and availability of proposed MPPT control strategy are verified by some simulated experiments conducted under random weather conditions; the effect of non-uniform weather on proposed MPPT strategy is tested by some experiments under non-uniform weather conditions; the output transient-state performance of proposed MPPT strategy is analyzed by one experiment under a varying irradiance condition and the performance comparison with conventional P&O method is made by another experiment under a given weather condition. © 2014 Elsevier Ltd.


Liu H.,Hubei University for Nationalities
Journal of Nanoparticle Research | Year: 2010

Iron phosphate nanorods were synthesized via a novel facile route. The structure, composition, and morphology of the prepared material were characterized by X-ray diffraction (XRD) and transmission electron microscope (TEM), respectively. The diffraction lines were indexed to the hexagonal structure. The diameter of these nanorods is about in the range of 20-30 nm and the length 50-100 nm. The preferential growth direction of the prepared material was the [100]. The reaction mechanism for the synthesis of FePO4 nanorods was also primarily discussed. Compared to the bulky and the irregular nanoparticles, the nanometer ones will be more fascinating for application in many areas. © 2010 Springer Science+Business Media B.V.


To improve the tracking speed of maximum power point (MPP) of photovoltaic (PV) system, some maximum power point tracking (MPPT) algorithms or their improved algorithms have been studied in depth. However, these algorithms are usually the improvement for a certain MPPT method, now there still exists no common method for improving the rapidity of the MPP tracking. To solve this question, in this paper, the conceptions of load-variable-weather-parameter (RVWP) optimization interval and variable-weather-parameter (VWP) optimization interval are proposed. Meanwhile, on the basis of them, a VWP optimization strategy, which can optimize the tracking speed of most MPPT algorithms, is proposed. In this strategy, the control signal of PV system has been quickly contracted within RVWP interval or VWP interval before a MPPT method which will implement the MPP tracking is operated. Therefore, the essence of this strategy is that the MPP tracking speed is increased by contracting the optimizing range-in other words, the global optimization is converted into local optimization. Finally, in this paper, the conventional perturb and observe (P&O) method is selected as the optimized object to study the MPP tracking speed under constant load, changing load, constant weather and changing weather conditions. The results of simulated experiments show that the MPP tracking speed can be greatly optimized by VWP optimization strategy with RVWP interval in any case and can be optimized by VWP optimization strategy with VWP interval in most cases, and that the output power stability can be also optimized by proposed optimization strategy for PV system with output power oscillating. © 2014 Elsevier Ltd.

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