Yinchuan, China

Ningxia University

www.nxu.edu.cn
Yinchuan, China

Ningxia University is a regional comprehensive university, co-administrated by Ningxia Hui Autonomous Region and Ministry of Education of the People's Republic of China.The school was founded in 1958. In the end of 1997, Ningxia Institute of Technology and Yinchuan Normal College were merged into the University. In February 2002, it was merged with Ningxia Agricultural College, and formed the new Ningxia University.It currently comprises three campuses. It consists of more than 2,600 teachers and staff, over 50% of them are formal instructors. More than half of the instructors hold intermediate to senior titles, 52% of them with masters or doctors degrees. 15 teachers receives special subsidies of the State Council, and 17 were elected into "National Hundreds, Thousands, Tens of Thousands Experts Project". It enrolls more than 15,000 undergraduates and over 1,300 graduates. More than 600 are minority preparatory students. Wikipedia.

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Jinjuan L.,Ningxia University
Proceedings - 9th International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2017 | Year: 2017

In the traditional loan credit risk assessment of enterprise , enterprise credit and loan risk is conflicting. That is, when trying to change the needs of either party, the credit risk will be increased necessarily. Therefore, we proposed an enterprise credit risk assessment method based on the improved genetic algorithm to establish the performance architecture of the latitude-longitude grid performance architecture, the performance of the architecture latitude grid, improving the the generation of initial population, which improved the derivative rate of genetic algorithm and reduced the number of iterations and operations. The speed of operation was improved. For the enterprise credit credit, the fitness function was proposed, and the adaptability of the improved algorithm to the credit risk of the enterprise was satisfied. The experimental results show that the improved and optimized latitude-longitude grid task genetic algorithm improved the enterprise credit risk assessment method, which is better than the traditional strategy, and can be widely used. © 2017 IEEE.


Yang Y.Q.,Ningxia University
Materials Science Forum | Year: 2017

The microwave absorbing rubber was prepared by adding the microwave absorber PPy/Ni/NanoG and other additives into NBR rubber. By analysis, the proper contents of N330, DOP and PPy/Ni/NanoG are 60, 10 and 25, respectively. The reflection loss of the rubber is below -10 dB at 8.2~11.4 GHz and the minimum loss value is -14.58 dB at 9.76 GHz. The work is supported by Natural Science Funds of Ningxia Province (NZ14018). © 2017 Trans Tech Publications, Switzerland.


Lai X.,Ningxia University
Inorganic Chemistry Frontiers | Year: 2017

High-efficiency solar energy utilizing techniques such as photovoltaic systems and photocatalysis have attracted significant interest for use as the most attractive strategies for solving energy and environment problems. However, it is still a great challenge to realize satisfactory solar energy utilizing efficiency to develop ideal electrodes or catalysts with broad-spectrum light harvesting, large accessible surface areas, and superior electrical properties. This article highlights a recent report by Wang's group, who successfully synthesized a dually ordered porous TiO2-rGO composite for efficient solar energy utilization. © The Partner Organisations.


Ma Y.,Ningxia University | Ge Y.,Ningxia University
Applied Mathematics and Computation | Year: 2010

In this paper, we extend the Sun and Zhang's [24] work on high order finite difference method, which is based on the Richardson extrapolation technique and an operator interpolation scheme for the one and two dimensional steady convection diffusion equations to the three dimensional case. Firstly, we employ a fourth order compact difference scheme to get the fourth order accurate solution on the fine and the coarse grids. Then, we use the Richardson extrapolation technique by combining the two approximate solutions to get a sixth order accurate solution on coarse grid. Finally, we apply an operator interpolation scheme to achieve the sixth order accurate solution on the fine grid. During this process, we use alternating direction implicit (ADI) method to solve the resulting linear systems. Numerical experiments are conducted to verify the accuracy and effectiveness of the present method. © 2009 Elsevier Inc. All rights reserved.


Tian X.,Ningxia University
International Journal of Advancements in Computing Technology | Year: 2012

In this paper, the improved version of Prewitt operator edge detection algorithm proposed which is based on the soft-threshold wavelet de-noising is aimed at processing the image with Gaussian white noise. A number of experiments show that this algorithm adds some advantages of wavelet de-noising, such as that the differential nature of the wavelet function can highlight the discontinuous edge of the image, The multi-resolution of wavelet transform overcome the contradiction between reduction of noise and the precision of edge positioning in the field of neighborhood selection. At the same time the wavelet transformation has the function of band-pass filter, and it can extraction the different levels of information. The improvement of algorithm combined by soft-thresholding wavelet de-noise and the conventional prewitt operator is a much better method than the conventional edge detection operator when it detects the edge of the image with White Gauss Noise.


Ding L.-H.,Ningxia University
Yantu Lixue/Rock and Soil Mechanics | Year: 2011

The stability of slope is influenced by multiple factors. It is one important subject to evaluate and predict the stability reasonably in the research of slope. Based on the approved grey correlation analysis and analytic hierarchy process (AHP), the comprehensive method is proposed to analyze the slope stability. According to the principle of grey correlation analysis, associate degree of slope stability is estimated and the slope grade is appraised by maximum correlation law. This method avoids the disadvantage that interval of the grade standards is not taken into account in traditional grey correlation analysis. The AHP of scale 3 is used to discuss the index weights; and precision of grey correlation analysis is improved. Case study shows that this method is reasonable and feasible to estimate slope stability.


Wen Z.,Nanjing University | Wen Z.,Ningxia University | Li C.,Nanjing University | Wu D.,Nanjing University | And 2 more authors.
Nature Materials | Year: 2013

Ferroelectric tunnel junctions (FTJs), composed of two metal electrodes separated by an ultrathin ferroelectric barrier, have attracted much attention as promising candidates for non-volatile resistive memories. Theoretical and experimental works have revealed that the tunnelling resistance switching in FTJs originates mainly from a ferroelectric modulation on the barrier height. However, in these devices, modulation on the barrier width is very limited, although the tunnelling transmittance depends on it exponentially as well. Here we propose a novel tunnelling heterostructure by replacing one of the metal electrodes in a normal FTJ with a heavily doped semiconductor. In these metal/ferroelectric/semiconductor FTJs, not only the height but also the width of the barrier can be electrically modulated as a result of a ferroelectric field effect, leading to a greatly enhanced tunnelling electroresistance. This idea is implemented in Pt/BaTiO3/Nb:SrTiO3 heterostructures, in which an ON/OFF conductance ratio above 104, about one to two orders greater than those reported in normal FTJs, can be achieved at room temperature. The giant tunnelling electroresistance, reliable switching reproducibility and long data retention observed in these metal/ferroelectric/semiconductor FTJs suggest their great potential in non-destructive readout non-volatile memories. © 2013 Macmillan Publishers Limited. All rights reserved.


Huang X.-F.,Lanzhou University | Ma J.-X.,Ningxia University | Liu W.-S.,Lanzhou University
Inorganic Chemistry | Year: 2014

On the basis of lanthanide metalloligands, [Ln(ODA)3] 3- (H2ODA = oxydiacetic acid), three series of d-f heterometallic metal-organic frameworks, {[Co(H2O) 6]·[Ln2(ODA)6Co2] ·6H2O}n [1; Ln = Gd (1a), Dy (1b), and Er (1c)], {[Ln2(ODA)6Cd3(H2O) 6]·mH2O}n [2; Ln = Pr (2a), Nd (2b), Sm (2c), Eu (2d), and Dy (2e), m = 9, 6, or 3], and {[Cd(H2O) 6]·[Ln2(ODA)6Cd2] ·mH2O}n [3; Ln = Dy (3a), Ho (3b), Er (3c), Tm (3d), and Lu (3e), m = 6 or 12], were designed and synthesized by a solvent volatilization and hydrothermal method. Magnetic investigation of 1 reveals the ferromagnetic interactions between the metal ions. In 2, LnIII ions occupied the inversion centers, which are confirmed by the fact that the emission intensity ratio of 5D0 → 7F 1 to 5D0 → 7F2 of the EuIII ion is much more than 3 in 2d. It is worth noting that, in 2d, the intensity ratio I(5D0→7F 1)/I(5D0→7F2) could decrease significantly upon the introduction of different hydrophilic guest molecules, which implies that the luminescent properties of 2d have a strong dependence on the geometry of the first coordination sphere of the Eu III ion. © 2014 American Chemical Society.


A fourth-order compact difference discretization scheme with unequal meshsizes in different coordinate directions is employed to solve a three-dimensional (3D) Poisson equation on a cubic domain. Two multgrid methods are developed to solve the resulting sparse linear systems. One is to use the full-coarsening multigrid method with plane Gauss-Seidel relaxation, which uses line Gauss-Seidel relaxation to compute each planewise solution. The other is to construct a partial semi-coarsening multigrid method with the traditional point or plane Gauss-Seidel relaxations. Numerical experiments are conducted to test the computed accuracy of the fourth-order compact difference scheme and the computational efficiency of the multigrid methods with the fourth-order compact difference scheme. © 2010 Elsevier Inc.


Ma W.-T.,Ningxia University
Yantu Lixue/Rock and Soil Mechanics | Year: 2010

Based on the displacement sequence of slope, the stability of slope could be judged effectively by forecasting the displacement of slope in the future. Through analyzing advantages and disadvantages of grey forecasting methods and least square support vector machines(LSSVM) respectively , a new forecasting model of grey least square support vector machine was proposed. The new model not only developed the advantages of accumulation generation of the grey forecasting method, weakened the effect of stochastic-disturbing factors in original sequence and strengthened the regularity of data, but also used the quickly solving speed and the excellent characteristics of least square support vector machines for nonlinear relationship and avoided the theoretical defects existing in the grey forecasting model. At the same time, the genetic algorithms were used to optimize the parameters of new model. At last, two engineering examples are given to testify the effectiveness of the grey least square support vector machine method to forecast displacements of slope; the results show that the new model has higher precision.

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