Jin C.,Yibin University
Applied Physics A: Materials Science and Processing | Year: 2017
Polycrystalline MnTeMoO6 powder has been synthesized by a new approach that MnO2 is used as the manganese source. The transformation mechanism of manganese ions in the new approach has been discussed. The nonlinear optical property of polycrystalline MnTeMoO6 has been investigated, and compared with single-crystalline samples. The transformation Mn4+ → Mn2+ may be formed directly without stable intermediates, and TeO2 may serve as catalyst. The SHG response of polycrystalline MnTeMoO6 powder is worse than that of single-crystalline powder in the same particle size distribution as its pseudo-size. The results indicate that it should pay special attention with the pseudo-size of polycrystalline powder when the potential nonlinear optical materials are screened by powder second harmonic generation measurements. © 2017, Springer-Verlag Berlin Heidelberg.
Gao Y.,Henan Normal University |
Wan M.,Yibin University
Physical Chemistry Chemical Physics | Year: 2017
The feasibility of laser cooling of the AlBr molecule is investigated using ab initio quantum chemistry. Potential energy curves, permanent dipole moments, and transition dipole moments for the ground state X1Σ+ and the first two excited states (a3Π and A1Π) are calculated using the multi-reference configuration interaction plus Davidson corrections (MRCI+Q) method with the ACVQZ basis set; the spin-orbit coupling effects are also taken into account in electronic structure calculations at the MRCI level. Based on the acquired potential energy curves and transition dipole moments, highly diagonally distributed Franck-Condon factors (f00 = 0.9540, f11 = 0.8172) and vibrational branching ratios (R00 = 0.9708, R11 = 0.8420) for the transition A1Π1 (ν) → X1∑0+ + (ν)are determined. Radiative lifetime calculations of the A1Π1 (ν = 0-4) state are found to be short (9.16-11.48 ns) enough for rapid laser cooling. The proposed main cycling laser drives the X1∑0+ + (ν = 0) → A1Π1 (ν = 0) transition at the wavelength λ00 = 279.19 nm. The vibrational branching loss ratios of the A1Π1 (ν') state to the intervening states a3Π0 + and a3Π1 are small (<5.2 × 10-6) enough to be negligible. The present theoretical results indicate that the AlBr molecule is a promising candidate for laser cooling. © 2017 the Owner Societies.
Cao Q.-L.,Yibin University |
Wang P.-P.,Yibin University
Journal of Geophysical Research: Solid Earth | Year: 2017
Molecular dynamic simulations were applied to investigate the Stokes-Einstein relation (SER) and the Rosenfeld entropy scaling law (ESL) in liquid Fe0.9Ni0.1 over a sufficiently broad range of temperatures (0.70 < T/Tm < 1.85; Tm is melting temperature) and pressures (from 50 GPa to 300 GPa). Our results suggest that the SER and ESL hold well in the normal liquid region and break down in the supercooled region under high-pressure conditions, and the deviation becomes larger with decreasing temperature. In other words, the SER can be used to calculate the viscosity of liquid Earth's outer core from the self-diffusion coefficients of iron/nickel and the ESL can be used to predict the viscosity and diffusion coefficients of liquid Earth's outer core form its structural properties. In addition, the pressure dependence of effective diameters cannot be ignored in the course of using the SER. Moreover, ESL provides a useful, structure-based probe for the validity of SER, while the ratio of the self-diffusion coefficients of the components cannot be used as a probe for the validity of SER. ©2017. American Geophysical Union. All Rights Reserved.
Chen Y.,Yibin University |
Hu W.,Yibin University |
Feng Y.,Northwest University, China |
Sweeney S.,Northwest University, China
Renewable and Sustainable Energy Reviews | Year: 2014
Developing biogas capacity is a key pillar in China's rural sustainable development program. The very dynamic transition of the rural socio-economic platform on which the current biogas development strategy has been based will require significant adjustments in material, technology and supply. The changes of socio-economic status, the problems of resent state and prospects of rural biogas development in China, including fermentation material, fermentation technology, development model and comprehensive utilization of biogas, are discussed in this paper. The results of our analysis indicated the full use of straw as a raw material will be the direction of biogas development in China. Dry methane fermentation will become an important method in the large scale production of biogas from agricultural wastes. The central supply model is the future biogas development model in rural China. It is with broad market and great potential to produce commercial fertilizer from biogas residue. Using biogas to generate electricity has become a new and efficient way to use biogas. © 2014 Elsevier Ltd.
Zhong F.,Southwest Jiaotong University |
Zhong F.,Yibin University |
Zhang J.,Southwest Jiaotong University
IEEE Transactions on Image Processing | Year: 2013
Linear discriminant analysis (LDA) is a well-known dimensionality reduction technique, which is widely used for many purposes. However, conventional LDA is sensitive to outliers because its objective function is based on the distance criterion using L2-norm. This paper proposes a simple but effective robust LDA version based on L1-norm maximization, which learns a set of local optimal projection vectors by maximizing the ratio of the L1-norm-based between-class dispersion and the L1-norm-based within-class dispersion. The proposed method is theoretically proved to be feasible and robust to outliers while overcoming the singular problem of the within-class scatter matrix for conventional LDA. Experiments on artificial datasets, standard classification datasets and three popular image databases demonstrate the efficacy of the proposed method. © 1992-2012 IEEE.
Qin F.,Yibin University
2012 5th International Congress on Image and Signal Processing, CISP 2012 | Year: 2012
In order to improve the quality of the defocus blurred image, the defocus point spread function (PSF) of the imaging system needs to be estimated. A blind image restoration algorithm was proposed, in which the defocus PSF of the blurred image was estimated through error-parameter estimation method. Firstly, the error-parameter curve was generated through Wiener filtering algorithm. Then, by analyzing the error-parameter curve, the defocus radius of the blurred image was estimated. Finally, utilizing the estimated PSF, image restoration was performed through Wiener filtering algorithm. Experimental results showed that the defocus PSF was estimated with high accuracy, and justified the fact that the defocus PSF estimation plays a great important part in blind image restoration. © 2012 IEEE.
Chen Y.,Yibin University |
Hu W.,Yibin University |
Sweeney S.,Northwest University, China
Renewable and Sustainable Energy Reviews | Year: 2013
The objective of this study was to assess biogas production capacity in different regions of China based on climate conditions and substrate availability. The results of our analysis indicated large differences in below-ground temperature and solar energy resources among different regions of China. According to data collected in 2006, slightly more than 1200 million tons of crop residue and manure could be used as substrates for biogas production. We suggest that household biogas technology must be developed according to local conditions. © 2013 Published by Elsevier Ltd.
Zhong F.J.,Yibin University
Applied Mechanics and Materials | Year: 2013
In this paper, we propose a simple but effective bidirectional 2DPCA based on Ll-norm maximization ((2D)2PCA-Ll). Traditional bidirectional 2DPCA is sensitive to outliers for its L2-norm-based least squares criterion, while (2D)2PCA-Ll is robust. Experimental results demonstrate its advantages in the fields of data compression and object recognition. © (2013) Trans Tech Publications, Switzerland.
Qin X.,Hangzhou Normal University |
Chang S.-S.,Yibin University |
Cho Y.J.,Gyeongsang National University
Nonlinear Analysis: Real World Applications | Year: 2010
In this paper, we consider an iterative method for finding a common element of the set of a generalized equilibrium problem, of the set of solutions to a system of variational inequalities and of the set of fixed points of a strict pseudo-contraction. Strong convergence theorems are established in the framework of Hilbert spaces. The results presented in this paper improve and extend the corresponding results announced by many others. © 2009 Elsevier Ltd. All rights reserved.
Fu X.-H.,Yibin University
Analytical Letters | Year: 2010
The aim of this study is to develop a new potentiometric immunoassay for carbohydrate antigen-125 (CA125) in human serum by using poly(amidoamine) dendrimer-modified multifunctional magnetic beads conjugated with antibodies as immunosensing probes. With an external magnet, the developed immunosensor exhibited rapid potential response and wide linear range from 0.5 to 55 U/mL with a low detection limit of 0.1 U/mL CA125. The precision, selectivity, and stability of the developed immunosensor were acceptable. Analytical results obtained for the clinical serum specimen by the developed immunosensor were in accordance with those assayed by the enzyme-linked immunosorbent assay method. © Taylor & Francis Group, LLC.