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Chongqing, China

Chongqing University is a key national university located in Chongqing, China,and a member of the "Excellence League". Chongqing University is also one of the "Project 211 and Project 985” universities with full support in the construction and development from the central government and the Chongqing Municipal Government. Among its various departments, Chongqing University is especially highly ranked in the Built Environment, Engineering, Technology, and Business disciplines. Wikipedia.

Ding B.,Chongqing University
IEEE Transactions on Fuzzy Systems | Year: 2010

This paper addresses the stabilization of nonlinear systems, which is represented by a TakagiSugeno (TS) model. Based on the extended nonquadratic Lyapunov function and the nonparallel distributed compensation law, three new results are obtained by using appropriate slack matrices, collection matrices, and the higher dimensional collection matrix. The first two results are less conservative, and computationally less expensive, than some of the existing results. The third result combines the procedures of the first two results, and is less conservative, but is computationally more expensive than the first two results. The effectiveness of the new results is validated by two numerical examples. © 2006 IEEE. Source

Residual tensile stresses often increase the susceptibility to cold cracking, and also promote brittle fracture, fatigue failure, and stress corrosion cracking in combination with tensile stresses experienced during service. Welding-induced deformation usually degrades the performance of a structure. Thus, the control of welding residual stress and distortion is a crucial task in welding manufacturing. There are too many factors that affect welding residual stresses and distortion. Besides material properties and design-related parameters, the welding procedures such as deposition sequence and assembly sequence also have significant influence on the final residual stress distribution and deformation. In this study, a computational approach based on Quick Welder software was developed to simulate the welding temperature field, residual stress distribution and deformation in multi-pass joints. The main objective was to clarify the influence of deposition sequence on the final residual stress distribution and deformation in an austenitic stainless steel tube-block joint with J-groove. The simulation results indicate that deposition sequence not only significantly affects the distribution of residual stress but also can alter the deformation mode to a certain extent. In addition, it was found that the last weld pass seems to have the largest contribution to the final welding residual stress filed of current tube-block joint. © 2013 Elsevier Ltd. Source

Liu R.,Chongqing University
Materials | Year: 2014

Inorganic/organic hybrid solar cells have attracted a lot of interest due to their potential in combining the advantages of both components. To understand the key issues in association with photoinduced charge separation/transportation processes and to improve overall power conversion efficiency, various combinations with nanostructures of hybrid systems have been investigated. Here, we briefly review the structures of hybrid nanocomposites studied so far, and attempt to associate the power conversion efficiency with these nanostructures. Subsequently, we are then able to summarize the factors for optimizing the performance of inorganic/organic hybrid solar cells. © 2014 by the authors. Source

Li X.-H.,Chongqing University
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2010

We present an efficient entanglement purification protocol with hyperentanglement in which additional spatial entanglement is utilized to purify the two-particle polarization-entangled state. The bit-flip error and phase-flip error can be corrected and eliminated in one step. Two remote parties can obtain maximally entangled polarization states deterministically and only passive linear optics are employed. We also discuss the protocol with practical quantum source and noisy channel. © 2010 The American Physical Society. Source

This paper considers stability of discrete-time nonlinear systems in TakagiSugeno (TS) form. This problem has been studied for more than 20 years with many sufficient conditions, and the asymptotically necessary and sufficient (ANS) conditions with respect to the common-quadratic Lyapunov, function, having being obtained. This paper considers general forms of homogeneous polynomially nonquadratic Lyapunov (HPNQL) function and homogeneous polynomially parameterized nonparallel distributed compensation (HPP-non-PDC) law. By generalization of the procedure based on Plyas theorem and techniques used for parameter-dependent linear matrix inequality (PD-LMI) which have been studied previously in different contexts, ANS stability conditions with respect to the general HPNQL function are obtained. © 2010 IEEE. Source

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