Chongqing Technology and Business University

www.ctbu.edu.cn
Chongqing, China

Chongqing Technology and Business University is a public university located in Nan'an District, Chongqing, China. Wikipedia.


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Chen S.-J.,Chongqing Technology and Business University | Li L.,Southwest University
Nonlinear Analysis: Real World Applications | Year: 2013

In this paper we study the following nonhomogeneous Kirchhoff equation -(a+b∫RNδu2dx)Δu+V(x)u=f(x,u)+h(x), inRN, where f satisfies the Ambrosetti-Rabinowitz type condition. Under appropriate assumptions on V, f and h, the existence of multiple solutions is proved by using the Ekeland's variational principle and the Mountain Pass Theorem in critical point theory. © 2012 Elsevier Ltd. All rights reserved.


Liu Q.,Chongqing Technology and Business University
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2010

Applying the condition of electromagnetic wave restricted in horizontal direction, the conditions that each mode should satisfy are concluded from the one-dimensional rectangle doping photonic crystal. The dependences of defect modes on the mode quantum number and doping thickness are obtained for TE wave and TM wave. These results can be used to design multi-channel filter with frequency tuning.


Zhao Z.,Chongqing Technology and Business University | Sun Y.,Chongqing Technology and Business University | Dong F.,Chongqing Technology and Business University
Nanoscale | Year: 2015

Graphitic carbon nitride (g-C3N4), as an intriguing earth-abundant visible light photocatalyst, possesses a unique two-dimensional structure, excellent chemical stability and tunable electronic structure. Pure g-C3N4 suffers from rapid recombination of photo-generated electron-hole pairs resulting in low photocatalytic activity. Because of the unique electronic structure, the g-C3N4 could act as an eminent candidate for coupling with various functional materials to enhance the performance. According to the discrepancies in the photocatalytic mechanism and process, six primary systems of g-C3N4-based nanocomposites can be classified and summarized: namely, the g-C3N4 based metal-free heterojunction, the g-C3N4/single metal oxide (metal sulfide) heterojunction, g-C3N4/composite oxide, the g-C3N4/halide heterojunction, g-C3N4/noble metal heterostructures, and the g-C3N4 based complex system. Apart from the depiction of the fabrication methods, heterojunction structure and multifunctional application of the g-C3N4-based nanocomposites, we emphasize and elaborate on the underlying mechanisms in the photocatalytic activity enhancement of g-C3N4-based nanocomposites. The unique functions of the p-n junction (semiconductor/semiconductor heterostructures), the Schottky junction (metal/semiconductor heterostructures), the surface plasmon resonance (SPR) effect, photosensitization, superconductivity, etc. are utilized in the photocatalytic processes. Furthermore, the enhanced performance of g-C3N4-based nanocomposites has been widely employed in environmental and energetic applications such as photocatalytic degradation of pollutants, photocatalytic hydrogen generation, carbon dioxide reduction, disinfection, and supercapacitors. This critical review ends with a summary and some perspectives on the challenges and new directions in exploring g-C3N4-based advanced nanomaterials. This journal is © The Royal Society of Chemistry.


Jiang Y.-K.,Chongqing Technology and Business University
Journal of Molecular Modeling | Year: 2010

Three-dimensional quantitative structure-activity relationship (3D-QSAR) and molecular docking studies were carried out to explore the binding of 73 inhibitors to dipeptidyl peptidase IV (DPP-IV), and to construct highly predictive 3D-QSAR models using comparative molecular field analysis (CoMFA) and comparative molecular similarity indices analysis (CoMSIA). The negative logarithm of IC50 (pIC50) was used as the biological activity in the 3D-QSAR study. The CoMFA model was developed by steric and electrostatic field methods, and leave-one-out cross-validated partial least squares analysis yielded a cross-validated value (r2cv) of 0.759. Three CoMSIA models developed by different combinations of steric, electrostatic, hydrophobic and hydrogen-bond fields yielded significant r 2cv values of 0.750, 0.708 and 0.694, respectively. The CoMFA and CoMSIA models were validated by a structurally diversified test set of 18 compounds. All of the test compounds were predicted accurately using these models. The mean and standard deviation of prediction errors were within 0.33 and 0.26 for all models. Analysis of CoMFA and CoMSIA contour maps helped identify the structural requirements of inhibitors, with implications for the design of the next generation of DPP-IV inhibitors for the treatment of type 2 diabetes. © Springer-Verlag 2010.


Yuan L.,Chongqing Technology and Business University | Lu Y.Y.,City University of Hong Kong
Optics Express | Year: 2013

Nonlinear optical effects can be enhanced by photonic crystal microcavities and be used to develop practical ultra-compact optical devices with low power requirements. The finite-difference time-domain method is the standard numerical method for simulating nonlinear optical devices, but it has limitations in terms of accuracy and efficiency. In this paper, a rigorous and efficient frequency-domain numerical method is developed for analyzing nonlinear optical devices where the nonlinear effect is concentrated in the microcavities. The method replaces the linear problem outside the microcavities by a rigorous and numerically computed boundary condition, then solves the nonlinear problem iteratively in a small region around the microcavities. Convergence of the iterative method is much easier to achieve since the size of the problem is significantly reduced. The method is presented for a specific two-dimensional photonic crystal waveguide-cavity system with a Kerr nonlinearity, using numerical methods that can take advantage of the geometric features of the structure. The method is able to calculate multiple solutions exhibiting the optical bistability phenomenon in the strongly nonlinear regime. © 2013 Optical Society of America.


Liu Q.-N.,Chongqing Technology and Business University
Guangzi Xuebao/Acta Photonica Sinica | Year: 2012

In order to obtain resonance theory of 1D doping photonic crystal, a resonant cavity model is set up and the analytical formulas of the defect mode frequency of 1D doping photonic crystal is deduced by resonance conditions of the resonant cavity. The physical mechanism of the defect mode of 1D doping photonic crystal is explained. The use of analytical formulas for the variation, which defect mode frequency with the incident angle and thickness of impurities and refractive index of impurities changes, is studied. Resonance theory results and characteristic matrix method results are compared and their results are the same, and the resonance theory is the right way. The resonance theory to analyze variable relationship is convenient, which makes up the deficiency of the numerical calculation method of 1D photonic crystal.


Han Y.W.,Chongqing Technology and Business University | Chen G.,Chongqing Technology and Business University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2012

In this Letter, we study the properties of the (2. +. 1)-dimensional black holes from the viewpoint of geometrothermodynamics. We show that the Legendre invariant metric of the (2. +. 1)-dimensional black holes can produce correctly the behavior of the thermodynamic interaction and phase transition structure of the corresponding black hole configurations. We find that they are both curved and the curvature scalar gives the information about the phase transition point. © 2012 Elsevier B.V.


Liu Q.-N.,Chongqing Technology and Business University
Wuli Xuebao/Acta Physica Sinica | Year: 2011

For the analytic study of the defect mode of 1D doped phononic crystal, the multiple-beam interference method and Bloh theorem are adopted, the analytical formula of defect mode is derived and the defect mode of 1D doped phononic crystal is studied. The varition law of defect mode is obtained. The method in freed from the weaknewes of other methods that cannot carry on the analysis of defect mode. The method is valid and accurate method of studying the defect mode of 1D doped phononic crystal. © 2011 Chinese Physical Society.


Liu Q.-N.,Chongqing Technology and Business University
Wuli Xuebao/Acta Physica Sinica | Year: 2010

The mode condition of electromagnetic wave is obtained by making use of restriction condition of horizondal direation electromagnetic wave in one-dimensional rectanglular doped photonic crystal and the mode characteristics of electromagnetic wave is studied. The response of the defect mode versus mode quantum number and length of the rectangle is calculated by the characteristic matrix method. Some new defect mode structure of rectangular doped photonic crystal is obtained. ©2010 Chin.Phys.Soc.


Liu Q.,Chongqing Technology and Business University
Guangxue Xuebao/Acta Optica Sinica | Year: 2012

In order to obtain analytic theory of 1D photonic crystal, multi beam interference theory is used. Analytical formulas of total reflection tunnel effect frequency of 1D photonic crystal is deduced. Physical mechanism of total reflection tunnel effect of 1D photonic crystal is explained. Using the analytical formulas change rule of total reflection tunnel effect that response curves of frequency versus cycle number and incident angle and optical thickness are studied. Transmission matrix method and analytical method is compared and their results are the same, which indicates that analytical method is the right way. Analytical theory to analyze variable relation is convenient, it makes up deficiency of numerical calculation method of 1D photonic crystal.

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