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Fang S.Y.,Xi'an University of Science and Technology | Yang J.,Gansu Academy of science
Advanced Materials Research | Year: 2014

So far, the definitions of slope debris flow are cinders and divergent, even, some scholars equate it with the hill slope debris flow/landslide-induced debris flow and other similar terms. This article summarizes research on the slope debris flow, from the definition and classification of debris flow, study on the classification of slope debris flow, analyzes the formation conditions, properties and characteristics of slope debris flow, at last, use the definition method of attribute and kind, tentatively give the preliminary definition of the slope debris flow. © (2014) Trans Tech Publications, Switzerland.

Fang S.-Y.,Xi'an University of Science and Technology | Yang J.,Gansu Academy of science
Applied Mechanics and Materials | Year: 2014

Study on the unique activity rules of earthquake induced by coal mining(EICM) is the foundation of earthquake prevention and disaster reduction. Based on the record data of EICM in northern Shaanxi from 2009 to 2012,the time-space distribution rules of seismic events is investigated by statistical methods; the trend of activities is predicted by analysis of magnitude-frequency relationship and creep curves sequence of EICM; the formation mechanics is discussed by using energy principle, the results show that: the corresponding relationship between EICM and on-site mining activity patterns is obvious, with the coal mining scale and depth increasing, EICM is inevitable, caused by the roof fall collapse, its intensity (the maximum magnitude of possible is ML 4.4) and frequency will increase further in the next period of time. © (2014) Trans Tech Publications, Switzerland.

Yu L.,Lanzhou University | Xue W.,Lanzhou University | Cui L.,Lanzhou University | Xing W.,Gansu Academy of science | And 2 more authors.
International Journal of Biological Macromolecules | Year: 2014

Fe3O4 nanoparticles were modified with Hydroxypropyl-β-cyclodextrin (HP-β-CD) and Polyethylene glycol 400 (PEG400) by a facile one-pot homogeneous precipitation method, and were used as a novel nano-adsorbent for the removal of congo red (CR) from aqueous solutions. The polymer-modified composites were characterized by FTIR, TEM, TGA, XRD and VSM, and showed excellent adsorption efficiency for CR. The value of the maximum adsorption capacity calculated according to the Langmuir isotherm model were 1.895g/g, which are much high and about 19 times that of Fe3O4 nanoparticles. Desorption study further indicates the good regeneration ability of the nanocomposites. The results suggest that the HP-β-CD/PEG400-modified Fe3O4 nanoparticles is a promising adsorbent for CR removal from aqueous solutions, and it is easily recycled owing to its large specific surface area and unique magnetic responsiveness. © 2013.

Li F.,Lanzhou University | Li J.,Lanzhou University | Lin X.,Lanzhou University | Li X.,Lanzhou University | And 6 more authors.
Journal of Power Sources | Year: 2015

Design and synthesis of non-precious-metal catalyst for efficient electrochemical transformation of water to molecular hydrogen in acid environments is of paramount importance in reducing energy losses during the water splitting process. Here, the hybrid material of MoS2-coated Cu loaded on the multi-walled carbon nanotubes (MWCNTs@Cu@MoS2) was synthesized using chemical process and hydrothermal method. It was found that the participation of MWCNTs and Cu nanoparticles not only improved the electrical conductivity of the catalyst, but also further enhanced the catalytic activity by synergistic effect with edge-exposed MoS2-coating. Electrochemical experiments demonstrated that the catalyst exhibited excellent hydrogen evolution reaction (HER) activity with large cathode currents (small overpotential of 184 mV for 10 mA cm-2 current density) and a Tafel slope as small as 62 mV per decade. Furthermore, it was discovered that the current density of this composite catalyst had a little decrease after the continual 1000 cycling, which showed the catalyst had a high stability in the recycling process. These findings confirmed that this catalyst was a useful and earth-abundant material for water splitting. © 2015 Elsevier B.V. All rights reserved.

Wang Z.,Lanzhou University | Wang S.,Lanzhou University | Zhu Y.,Gansu Academy of science | Ma Y.,Lanzhou University
Archives of Computational Methods in Engineering | Year: 2015

Recently, many researchers have paid their more attention to image fusion technique based on pulse coupled neural network (PCNN). In order to make the researchers to rapidly understand the research development of image fusion based on PCNN, it is systematically reviewed in the paper. On the basis of statistical analysis on published papers, firstly, PCNN and some modified models are introduced. Then we review the PCNN’s applications in the field of image fusion. Subsequently, some existing problems are summarized, while we give some suggestions for the future research. © 2015 CIMNE, Barcelona, Spain

Wang Z.,Lanzhou University | Li H.,Lanzhou University | Zhu Y.,Gansu Academy of science | Xu T.,Lanzhou University
Archives of Computational Methods in Engineering | Year: 2016

Plant recognition is closely related to people’s life. The operation of the traditional plant identification method is complicated, and is unfavorable for popularization. The rapid development of computer image processing and pattern recognition technology makes it possible for computer’s automatic recognition of plant species based on image processing. There are more and more researchers drawing their attention on the computer’s automatic identification technology based on plant images in recent years. Based on this, we have carried on a wide range of research and analysis on the plant identification method based on image processing in recent years. First of all, the research significance and history of plant recognition technologies are introduced in this paper; secondly, the main technologies and steps of plant recognition are reviewed; thirdly, more than 30 leaf features (including 16 shape features, 11 texture features, four color features), and then SVM was used to evaluate these features and their fusion features, and 8 commonly used classifiers are introduced in detail. Finally, the paper is ended with a conclusion of the insufficient of plant identification technologies and a prediction of future development. © 2016 CIMNE, Barcelona, Spain

Hou X.,Gansu Construction Vocational Technical College | Yao Z.,Gansu Academy of science | Wang J.,Gansu Construction Vocational Technical College
ICTE 2015 - Proceedings of the 5th International Conference on Transportation Engineering | Year: 2015

In this paper, a comparison analysis using FEM calculation was carried out regarding three kinds of anti-slide pile, i.e. The common one, the box-Type reinforced concrete one and the box-Type one with vertical prestressed tendons, showing that the displacement and positive bending moment of the pile with vertical prestressed tendons are smaller than that of the rest ones under 2000 kN landslide thrust, with slight increases of negative bending moment on both ends, indicating that it has obvious advantages in resisting displacement and bending during landslide control; on this basis, the layout patterns of the prestressed tendons were optimized by comparing the 5 types of layout option, and negative bending moment and shearing force of the box-Type pile with vertical end-curve-Arrangement prestressed tendons were found to be smaller than that of the rest ones, while the maximum positive bending moment and positive shearing force on the sliding surface remaining the same, proving that it is more scientific, reasonable and appropriate for landslide control; a loading simulation was conducted, showing that the prestress shall be applied appropriately. Combined with the inherent structure characteristics and internal vertical end-curve-Arrangement prestressed tendons, the landslide stability is improved for box-Type pile. © ASCE.

Liu X.,Gansu Academy of science
Northwestern Geology | Year: 2016

Debris flow risk study has a great significance for the engineering harnessing, as well as the determination of disaster prevention and mitigation countermeasures for Lanzhou city. In this paper, the data of typical debris flows have been investigated and analyzed, the quantitative indexs for Lanzhou debris flow disaster evaluation have been obtained through using the method of grey relational analysis, and the weights of every index have been calculated. On the basis of the evaluation model, the risk of debris flow in Ianzhou city has been evaluated. And then, the calculated risk degree of these 12 debris flows has been taken as testing indexes. It's found that the evaluation results fit well with the theoretical results, showing this method is reliable, simple and practical.

Wang Z.,Lanzhou University | Wang S.,Lanzhou University | Zhu Y.,Gansu Academy of science
Neural Processing Letters | Year: 2016

This paper proposes a novel multi-focus image fusion method based on pulse coupled neural networks (PCNN) and guided filter. PCNN matches human visual perception very well. And guided filter is an edge-preserving filter which is proposed in recent years. In our method, the fusion process consists of the following steps: firstly, the source images are preliminarily fused with the guided filter. Then the intermediate fused image is employed to motivate the improved PCNN to generate a fusion map. Finally, the source images are fused according to the fusion map. Six contrast methods are employed to evaluate the performance of the proposed approach in six groups of experiments. The experimental results show that the proposed method outperforms the most existing methods in both subjective visual effect and objective evaluation criteria. © 2016 Springer Science+Business Media New York

Zhang P.,Northwest Normal University | Mo Z.,Northwest Normal University | Han L.,Gansu Academy of science | Zhu X.,Northwest Normal University | And 2 more authors.
Industrial and Engineering Chemistry Research | Year: 2014

Magnetic TiO2/montmorillonite (MMT) /Fe3O4 nanocomposites were prepared by a single step of hydrolysis. First, a tetra-n-butyl titanate microemulsion wrapping Fe3O4 nanoparticles (NPs) was established through ultrasonic process. Then, the microemulsion was intercalated into MMT layers by vigorous stirring. Thereafter, in a controllable hydrolysis process, the TiO2 NPs were embedded into the layers of MMT. The adsorption and photocatalytic activity were evaluated by using the methylene blue (MB) as contaminants. The results indicated that anatase-TiO2 NPs (10-20 nm in diameter) were embedded in the layers of MMT and Fe3O4 NPs (45-60 nm in diameter) were deposited on the surface of MMT. Additionally, ca. 94% of the initial MB was decomposed by TiO2/MMT/Fe3O4 nanocomposite after 80 min UV irradiation, while ca. 85% of the initial MB was decomposed by TiO2 NPs. Furthermore, after being used 6 times, the TiO 2/MMT/Fe3O4 nanocomposite still maintained a high degradation rate and revealed good reuseability. © 2014 American Chemical Society.

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