Shaanxi University of Technology
Hanzhong, China
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Chen T.,Shaanxi University of Technology
Journal of Chemical and Pharmaceutical Research | Year: 2014

For the characteristics of small samples and high dimension of microarray data, this paper proposes a selective ensemble method teaching-learning-based optimization based to classify microarray data. Firstly, in order to remove irrelevant genes with classification task, reliefF algorithm is used to reduce original gene set, and then a new training set is produced from orginal training set according to top-ranked genes obtained. Secondly, multiple bootstrap training subsets are produced based on bagging algorithm on above obtained training set to train base classifiers. Finally, multiple base classifiers are selected by using teaching-learning-based optimization to build an ensemble classifier. Experimental results on eight microarray datasets show our proposed method is effective and efficient for microarray data classification. © 2014, Journal of Chemical and Pharmaceutical Research. All right reserved.

Rong S.-J.,Shaanxi University of Technology
Physical Review D | Year: 2017

The group Σ(36×3) with the generalized CP transformation is introduced to predict the mixing pattern of leptons. Various combinations of Abelian residual flavor symmetries with CP transformations are surveyed. Six mixing patterns could accommodate the fit data of neutrinos oscillation at the 3σ level. Among them, two patterns predict the nontrivial Dirac CP phase, around ±57° or ±123°, which is in accordance with the result of the literature and the recent fit data. Furthermore, one pattern could satisfy the experimental constraints at the 1σ level. © 2017 American Physical Society.

Peng Y.,Shaanxi University of Technology | Pan Q.,Hunan Normal University
Journal of High Energy Physics | Year: 2014

We study the entanglement entropy of general holographic dual models both in AdS soliton and AdS black hole backgrounds with full backreaction. We find that the entanglement entropy is a good probe to explore the properties of the holographic superconductors and provides richer physics in the phase transition. We obtain the effects of the scalar mass, model parameter and backreaction on the entropy, and argue that the jump of the entanglement entropy may be a quite general feature for the first order phase transition. In strong contrast to the insulator/superconductor system, we note that the backreaction coupled with the scalar mass can not be used to trigger the first order phase transition if the model parameter is below its bottom bound in the metal/superconductor system. © 2014 The Author(s).

Zhao J.,Harbin Institute of Technology | Zhao J.,Shaanxi University of Technology | Wang M.,Harbin Institute of Technology
Nonlinear Analysis: Real World Applications | Year: 2014

This paper is concerned with a free boundary problem for a prey-predator model in higher space dimensions and heterogeneous environment. Such a model may be used to describe the spreading of an invasive or new predator species in which the free boundary represents the spreading front of the predator species and is described by Stefan-like condition. For simplicity, we assume that the environment and solutions are radially symmetric. We prove a spreading-vanishing dichotomy for this model, namely the predator species either successfully spreads to infinity as t→∞ and survives in the new environment, or it fails to establish and dies out in the long run while the prey species stabilizes at a positive equilibrium state. The criteria for spreading and vanishing are given. © 2013 Elsevier Ltd. All rights reserved.

Yuan Z.,Shaanxi University of Technology
Journal of Materials Science: Materials in Electronics | Year: 2014

Zinc oxide (ZnO) nanoparticles were synthesized by a simple wet chemical method at low temperature. Morphologies, crystalline structure, and optical transmission of ZnO nanoparticles were investigated. The results showed that the average diameter of as-synthesized ZnO nanoparticles was about 4.9 nm, the nanoparticles were wurtzite-structured (hexagonal) ZnO and had optical band gap of 3.28 eV. Very high optical transmission (>80 %) in visible light region of ZnO nanoparticulate thin films was achieved. Furthermore, an inverted polymer solar cell consisted of ZnO nanoparticles and polymer were fabricated. The device exhibited an open circuit voltage (Voc) of 0.50 V, a short circuit current density (Jsc) of 1.76 mA/cm2, a fill-factor of 38 %, and a power conversion efficiency of 0.42 %. © 2014 Springer Science+Business Media New York.

Peng Y.,Shaanxi University of Technology
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2015

In this paper, we investigate the holographic phase transition with dark matter sector in the AdS black hole background away from the probe limit. We discuss the properties of phases mostly from the holographic topological entanglement entropy of the system. We find the entanglement entropy is a good probe to the critical temperature and the order of the phase transition in the general model. The behaviors of entanglement entropy at large strip size suggest that the area law still holds when including dark matter sector. We also conclude that the holographic topological entanglement entropy is useful in detecting the stability of the phase transitions. Furthermore, we derive the complete diagram of the effects of coupled parameters on the critical temperature through the entanglement entropy and analytical methods. © 2015 The Author.

Yuan Z.,Shaanxi University of Technology
Journal of Materials Science: Materials in Electronics | Year: 2014

Well-aligned ZnO nanowire arrays were grown on indium tin oxide coated glass substrates by a facile chemical bath deposition technique. Morphologies, crystalline structure and optical transmission were investigated by field-emission scanning electron microscope, X-ray diffraction and UV-visible transmission spectrum, respectively. The results showed that ZnO nanowires were aligned in a dense array approximately perpendicular to substrate surface, they were wurtzite-structured (hexagonal) ZnO. In addition, the nanowire arrays exhibited high optical transmission (>85 %) in the visible region. Furthermore, an inverted inorganic/polymer hybrid solar cell was built using as-grown well-aligned ZnO nanowire arrays as inorganic layer, under the AM 1.5 illumination with a light intensity of 80 mW/cm2, the device showed an open circuit voltage (Voc) of 0.44 V, a short circuit current (Jsc) of 3.23 mA/cm2, a fill-factor of 38 %, and a power conversion efficiency of 0.68 %. © 2014 Springer Science+Business Media New York.

Yuan Z.,Shaanxi University of Technology
Physica E: Low-Dimensional Systems and Nanostructures | Year: 2014

A simple photodiode based on boron subphthalocyanine chloride (SubPc) organic semiconductor and zinc oxide (ZnO) inorganic nanoparticle (NP) thin films planar heterojunction was fabricated. The current density-voltage (J-V) characteristics of ITO/ZnO NPs/SubPc/Ag device in dark and under 20 mW/cm 2 illumination power with a solar simulator were investigated in detail. Measurement results showed that the device exhibited good rectifying behaviors in dark and under illumination. A high rectification ratio (RR) of 607 at ±1.65 V and a low turn-on voltage of 0.9 V were achieved for the device in dark, such high RR was ascribed to high electron mobility of ZnO NPs and large ZnO NPs/SubPc interface in the device. Also, the photoresponsive mechanism of the photodiode was illuminated in term of the schematic band diagram and the transportation process of charge carriers in the device. © 2013 Elsevier B.V.

Xu X.,Shaanxi University of Technology
Computer Methods in Applied Mechanics and Engineering | Year: 2016

In this article, we develop an improved smoothed particle hydrodynamics (SPH) approach for simulating 3D dam-break flows with breaking waves. In order to improve the computational accuracy and pressure distributions, the correction of kernel gradient and the introduction of Rusanov flux into the continuity equation are particularly implemented. Also, both wall and dummy particles are employed for modeling the complex solid boundaries in a flexible way. To show the ability of the improved SPH approach for solving 3D free surface flow problems, three challenging numerical examples including 3D dam-break flow against a vertical wall, against a cuboid obstacle, and against a cylindrical obstacle are numerically simulated and compared with available experimental data in literature. The convergent behavior of the numerical algorithm has also been studied by using different particle resolutions. It is demonstrated that the improved SPH approach is capable of handling with 3D free surface flows with large deformations and fragmentations accurately and stably, and even more important, also computing an accurate and fluctuations-free pressure field. © 2016 Elsevier B.V.

Yong L.,Shaanxi University of Technology
ICIC Express Letters | Year: 2010

A feasible interior-point method for solving a class of nonnegative leastsquares problems is presented. Firstly, nonnegative least squares problem wastransformed into linear complementarity problem. Then we present a feasibleinterior point algorithm for monotone linear complementarity problem. We showthat the algorithm have the polynomial complexity if a feasible starting pointis available. At last, we give some numerical examples to indicate that themethod is feasible and effective. ICIC International © 2010.

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