Chengdu, China
Chengdu, China

Xihua University is a university in Sichuan province, People's Republic of China. Approved by the State Ministry of Education, Xihua University was founded on April 16, 2003, formed by the merger of the former Sichuan University of Science and Technology and the former Teacher's College. The former Sichuan University of Science and Technology, once called the Sichuan Mechanical College of Agriculture, was founded in 1960. The former Teacher's College, located in Peng Zhou County, was founded in 1971. Wikipedia.

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Liu L.,Xihua University
Advances in Intelligent Systems and Computing | Year: 2017

Financing risks evaluation of green residential buildings is conducted in this paper, based on fuzzy comprehensive evaluation method. The Chengdu Langshi green blocks project is used as a case-study for evaluating financing risks. The results show that real estate development enterprises of Sichuan province are of greater financing risks. The most influential risk factors are laws and policies, enterprise financial position, corporate reputation, enterprise management, macroeconomics, and industry competition, in that order. The results demonstrate measurement of financing risks using a case study, which is useful for the financing risk management of green residential buildings. © Springer Science+Business Media Singapore 2017.

Tian W.,Taiyuan University of Science and Technology | Chen H.,Xihua University
Scientific Reports | Year: 2016

Using the first-principles calculations, the electronic structure, chemical bonding, mechanical, thermodynamics and superconductor properties of NbRuB are investigated. The optimized lattice parameters were in good agreement with the experimental data. The analysis of the density of states and chemical bonding implies that the metallic behavior of NbRuB originates from the Ru and Nb, and the bonding behaviors are a mixture of covalent-ionic bonds. The bulk modulus, shear modulus, Young's modulus, Poisson's ratio and hardness of NbRuB were calculated. The results reveal that the NbRuB is ductility and the Vickers hardness is 15.06 GPa. Moreover, the 3D dependences of reciprocals of Young's modulus is also calculated and discussed, showing strong anisotropic character for NbRuB. Finally, the Debye temperature and superconducting transition temperature are obtained.

Wang Y.,Xihua University | Xiang Z.,University of Electronic Science and Technology of China
Journal of Differential Equations | Year: 2016

In this paper we continue to deal with the initial–boundary value problem for the coupled Keller–Segel–Stokes system{nt+u⋅∇n=Δn−∇⋅(nS(x,n,c)⋅∇c),(x,t)∈Ω×(0,T),ct+u⋅∇c=Δc−c+n,(x,t)∈Ω×(0,T),ut+∇P=Δu+n∇ϕ,(x,t)∈Ω×(0,T),∇⋅u=0,(x,t)∈Ω×(0,T), where Ω⊂Rd is a bounded domain with smooth boundary and the chemotactic sensitivity S is not a scalar function but rather attains values in Rd×d, and satisfies |S(x,n,c)|≤CS(1+n)−α with some CS>0 and α>0. When d=2, our previous work (J. Differential Equations, 2015) has established the existence of global bounded classical solutions under the subcritical assumption α>0, which is consistent with the corresponding results of the fluid-free system, but the method seems to be invalid in the three-dimensional setting. In this paper, for the case d=3, we develop a new method to establish the existence and boundedness of global classical solutions for arbitrarily large initial data under the assumption α>, which is slightly stronger than the corresponding subcritical assumption on the fluid-free system, where such an assumption is essentially necessary and sufficient for the existence of global bounded solutions. The key idea here is to establish the general Lp regularity of u from a rather low Lp regularity of n, which will be obtained by a new combinational functional. © 2016 Elsevier Inc.

Wang Y.,Xihua University | Cao X.,University of Paderborn | Cao X.,Renmin University of China
Discrete and Continuous Dynamical Systems - Series B | Year: 2015

This paper considers the chemotaxis-Stokes system (Equestion Presented) under no-flux boundary conditions in a bounded domain Ω ⊂ ℝ3 with smooth boundary. Here S is a matrix-valued sensitivity satisfying |S(x,n,c)| < C¯(1 + n)-α with some C¯ > 0 and α > 0. Although (∗) does not possess the natural gradient-like functional structure available when S reduces to a scalar function, we can still establish a new energy type inequality. Based on this inequality we achieve a coupled estimate for arbitrarily high Lebesgue norms of n and ∇c. This helps us to finally obtain the existence of a global classical solution when α is bigger than 1/6.

Chen H.,Xihua University
Journal of Convergence Information Technology | Year: 2012

Mammography is the most effective method for early breast cancer detection and diagnosis. Extraction of the breast profile region is helpful for the radiologist screening, and is also an essential preprocessing step for computer aided diagnosis (CAD). This paper proposed a fast classification mask construction algorithm, first to perform initial breast segmentation with optimal threshold combined with an area classifier at low image resolution, then make use of Dijkstra searching method to retrieve the accurate breast profile at the original resolution, finally, a classification mask for the mammogram is constructed. Experiment shows this algorithm can extract breast profile region from raw mammogram data fast, robustly and accurately.

Xu Y.,Xihua University
Optics Communications | Year: 2014

The phase-locking of the radial array CO2 laser (RAL) is introduced based on the injection-locking principle. The characteristic parameters of laser beams used in the phase-locking are described, and the coupling coefficient c00 between the injected mode and the eigenmode of RAL is calculated. The laser modes from RAL are the low-order Hermite Gaussian modes due to the diffraction loss. The analytical formula for the output beam through an ABCD optical system is derived according Collins formula. The numerical examples are given to illustrate our analytical results. © 2014 Elsevier B.V.

Xu Y.,Xihua University
Optics Communications | Year: 2014

A new type of laser resonator is presented to obtained good coherent beam and the parameters of the laser beam are calculated. The principle of phase-locking is described based on the injection-locking, the properties of the injected beam in the resonator are studied in detail. The output beam from output mirror is an annular laser beam with zero central intensity. An analytical expression for the annular laser beam through the ABCD optical system is derived. Typical numerical examples are calculated to confirm our analytical results. It is shown that the good coherent beam can be obtained through phase-locking, and the central intensity of annular beam through ABCD optical system will become maximum when the parameters of laser beam are selected reasonably. © 2014 Elsevier B.V.

Xu Y.,Xihua University
Optics Communications | Year: 2013

The analytical formula of elegant Laguerre Gaussian beam (ELGB) through the misaligned optical system is derived by using the diffraction integral equation. Based on the formula, the propagation properties of ELGB are studied in detail, the numerical examples are given to confirm the correctness of our calculated results. It is shown that the parameters (La, θa,φ,z,m) will influence the intensity distributions and beam shapes of ELGB, these results are useful in the application of laser beams. © 2013 Elsevier B.V.

Meng D.,Southwestern University of Finance and Economics | Pei Z.,Xihua University
Information Sciences | Year: 2013

We generalize linguistic evaluation values and their weights in group decision-making (GDM) problems based on unbalanced linguistic terms. The GDM problems include two types of weights: belief degrees of linguistic evaluation values and experts' weights. Due to the time pressure and conflict of multi-source of information, etc., experts may have various evaluations values on alternatives. The belief degree is used to represent the confidence level of the values. The experts' weight is used to represent the differences among experts' importance which caused by experts' experience or knowledge distinction. We propose the weighted unbalanced linguistic aggregation operators to synthesize linguistic evaluation value, belief degree and experts' weights. Some desired properties of the operator are then studied, these properties show that the operator extends the linguistic weighted averaging operator (LWA) and the linguistic ordered weighted averaging (LOWA) operator. Finally, an illustrative example of human resource performance appraisal based on the linguistic aggregation operator is provided. © 2012 Elsevier Inc. All rights reserved.

The analytical formula of radial array beams generated by radial array laser through misalignment of optical system is derived by using the diffraction integral equation. The propagation characteristics of radial array beams converged by the convergent optical system are studied. As the numerical examples, the influences of the two main parameters (the misalignment line deviation and angle deviation) on the light intensity are analyzed in detail. It is shown that the misalignment will lead to the increase of the light intensity of longitudinal lower-order Hermite-Gaussian beams (for example m=1, n=0), and the maximum light intensity (MLI) of the big misalignment (line deviation is 2 mm) is about 2 times higher than the small misalignment (line deviation is 1 mm). However, it will decrease for the transversal lower-order Hermite-Gaussian beams (for example m=0, n=1), and MLI of the small misalignment (line deviation is 1 mm) is about 2 times higher than the big misalignment (line deviation is 2 mm). The results are important for the laser rapid processing and high precision machining. © 2013 Elsevier Ltd.

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