Xinxiang vocational and technical college

Xinxiang, China

Xinxiang vocational and technical college

Xinxiang, China
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Zhao Y.,Capital Normal University | Gui L.,Xinxiang Vocational and Technical College | Chen Z.,Capital Normal University
Sensors and Actuators, B: Chemical | Year: 2017

We have proposed a colorimetric sensing assay exploiting the formation of gold amalgamation, combining with Hg2+ mediated the growth of gold nanoparticles (AuNPs) for rapid detecting Hg2+ ions with highly sensitivity and selectivity. In our developed approach, Hg2+ is reduced to elemental mercury by citrate-capped AuNPs, forming gold amalgamation on the surface of AuNPs. AuNP-Hg2+ interaction modulates the growth of AuNPs which is formed in the HAuCl4/NH2OH reaction. The rate of AuNP growth is highly dependent on the target concentration. AuNPs with low Hg coverage grow into spherical AuNPs with slow growth rate, which generates red-colored solutions. Whereas, AuNPs with high Hg coverage accelerate the growth of spherical AuNPs with a larger particle size, which generates blue colored solutions. At higher concentration, however, the growth rate of AuNPs begins to decrease. As the concentration of Hg2+ increases till the saturation of Hg onto the surface of AuNPs, the growth of the AuNPs is inhibited due to full coverage of Hg on the AuNP surface. On the basis of this principle, Hg2+ can be well determined ranging from 0.5 to 10 nM with a 0.26 nM of the detection limit. © 2016 Elsevier B.V.

Zheng W.,Xinxiang Vocational and Technical College | Liu J.,Xinxiang Vocational and Technical College
International Journal of Online Engineering | Year: 2017

The purpose of this study is to solve defects of the existing control strategy long convergence time, sliding mode chattering and so on. For Sensorless Brushless DC motor control strategy, a modified extended Kalman state correction estimation scheme is proposed, and dual mode high-order nonsingular terminal hybrid sliding mode control technology is put forward. TMS320F2812DSP core controller and CM200DY-12H inverter module and construction electric car core control module are established, and the program algorithm of the extended Kalman algorithm and hybrid sliding mode control is constructed. The results showed that the control system designed can suppress the system chattering, and the system has strong robustness, which has low requirement on the system model and can eliminate external disturbance input, showing outstanding performance in the convergence time and anti disturbance performance. In summary, a dual mode high-order non-singular terminal hybrid sliding mode control technology put forward is quite suitable for electric vehicle control system.

Zhai C.,Henan University | Zhai C.,Shandong University | Cui F.,Xinxiang Vocational and Technical College | Liu X.,Henan University
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2015

The molecular geometries, FT-IR and Raman spectra of 2-acetylpyridine were studied using Density functional theory (DFT-B3LYP) with the large basis sets. Theoretical calculations indicate the cis conformer of 2-acetylpyridine is most stable though this conformation was seldom found in the crystal structures of coordinated compounds. Based on the stable conformer, comprehensive assignments of the experimental bands were made. The observed and calculated positions are found to be in good agreement with an average deviation of <4 cm -1. The assignments provide valuable information for the fingerprint and identification of 2-acetylpyridine. © 2014 Elsevier B.V. All rights reserved.

Li W.,Xinxiang University | Wang X.,Xinxiang Vocational and Technical College | Sun L.,Zhengzhou University
Applied Mechanics and Materials | Year: 2011

The modes of a piece of disk spring and two piece of congruent disk spring are calculated by the finite element software ANSYS. Natural frequencies and vibration mode of every step are obtained. The results are analyzed. As a result, some useful references for design of disk spring are provided. © (2011) Trans Tech Publications, Switzerland.

Zhang H.,Xinxiang Vocational and Technical College | Chen H.,Liaocheng University
Fenmo Yejin Jishu/Powder Metallurgy Technology | Year: 2016

Mo5Si3-Al2O3 composites were fabricated using MoO3, Mo, Si and Al as starting materials by mechanical alloying and hot-pressed sintering method. The effects of Al2O3 content on microstructure and mechanical properties of the Mo5Si3-Al2O3 composites were investigated. The results show that the main phase of the composites are Mo5Si3, Al2O3 and Mo3Si. The grain size of Mo5Si3, Al2O3 and Mo3Si are 51~99nm and the Mo5Si3-Al2O3 composites have nano-crystalline structure. Addition of Al2O3 may refine grain of the composites, and improve their density and mechanical properties. The density, hardness, flexure strength and fracture toughness of Mo5Si3-Al2O3 composites are 99.6%, 13.2 GPa, 322 MPa and 6.43 MPa·m1/2, respectively. © 2016, University of Science and Technology Beijing. All right reserved.

Sun M.,Xinxiang vocational and technical college | Cheng Y.B.,Xinxiang vocational and technical college
Applied Mechanics and Materials | Year: 2014

This paper briefly summarized the logical structure of the model's attribute characteristics in the wireless sensor network management system of coal enterprise. Due to all kinds of mapping relations between different datum, while extracting some device status information, we can detect it by the method of hierarchical search, and according to the determined geographical location, then obtain the attribute and graphic information, finally get all the relative information of the device, so that the information management system is fast and convenient to be used. © (2014) Trans Tech Publications, Switzerland.

Miao T.,Huazhong University of Science and Technology | Miao T.,Xinxiang Vocational and Technical College | Yu B.,Huazhong University of Science and Technology | Duan Y.,Southwest Petroleum University | Fang Q.,Southwest Petroleum University
International Journal of Heat and Mass Transfer | Year: 2015

Rocks with shear fractures or faults widely exist in nature such as oil/gas reservoirs, and hot dry rocks, etc. In this work, the fractal scaling law for length distribution of fractures and the relationship among the fractal dimension for fracture length distribution, fracture area porosity and the ratio of the maximum length to the minimum length of fractures are proposed. Then, a fractal model for permeability for fractured rocks is derived based on the fractal geometry theory and the famous cubic law for laminar flow in fractures. It is found that the analytical expression for permeability of fractured rocks is a function of the fractal dimension Df for fracture area, area porosity Φ, fracture density D, the maximum fracture length lmax, aperture a, the facture azimuth α and facture dip angle θ. Furthermore, a novel analytical expression for the fracture density is also proposed based on the fractal geometry theory for porous media. The validity of the fractal model is verified by comparing the model predictions with the available numerical simulations. © 2014 Elsevier Ltd. All rights reserved.

Yang Z.,Henan Mechanical and Electrical Engineering College | Fan G.,Xinxiang Vocational and Technical College
Applied Mechanics and Materials | Year: 2011

This paper introduces blanking, drawing and compound die of the cylindrical parts. The compound die applies the special structure to maintain a constant blank holder pressure, which is not increased by drawing. It reduces the processes and improves the efficiency of production. © (2011) Trans Tech Publications.

Li M.,Xinxiang Vocational and Technical College
Engineering Technology, Engineering Education and Engineering Management - International Conference on Engineering Technology, Engineering Education and Engineering Management, ETEEEM 2014 | Year: 2015

Under the present situation and problems of mechanical drawing class teaching, it aims to explore the mechanical drawing. With the advantage of the Pro/E platform, it aims to solve problems and drawbacks of the conventional mechanical drawing classroom and improve the quality of classroom teaching of mechanical drawing, and enhance student learning interest in cartography, to enhance the students’ information literacy, to open up a new effective way to increase interest in vocational college students studying professional courses, and to provide teachers with practical teaching strategies. © 2015 Taylor & Francis Group, London.

Yu X.,XinXiang Vocational and Technical College | Zhang Q.S.,XinXiang Vocational and Technical College
Applied Mechanics and Materials | Year: 2014

We study the Cauchy problem for the convection-diffusion equation, which describes physical phenomena where particles, energy, or other physical quantities are transferred inside a physical system due to diffusion and convection processes. For α > 2, we show the continuous dependence upon the initial data. Moreover, asymptotically self-similar global solutions are investigated with nonhomogeneous initial date. © (2014) Trans Tech Publications, Switzerland.

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