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Chen H.,Taiyuan University of Technology | Wang W.,Taiyuan University of Technology | Li Y.,Taiyuan University of Technology | Nie H.,Taiyuan University of Technology | And 2 more authors.
Fenmo Yejin Cailiao Kexue yu Gongcheng/Materials Science and Engineering of Powder Metallurgy | Year: 2016

Using 6061Al as cladding material and B4C/Al composite as interlayer, B4C/Al-Al layered composite was fabricated by power metallurgy and followed by hot rolling with different thicknesses. The SEM morphology and microstructure of the fabricated composites were observed and analyzed, the tensile strength and hardness were tested, fracture mechanism was also explored. The results show that the interface of B4C/Al and Al layer is well combined. And the distribution of B4C particles in the 6061Al alloy matrix is almost homogeneous. The hardness of the composite presentes the bread peak distribution, the interlayer has higher hardness than the surface layer. The tensile strength increases with the increase of thickness. The maximum tensile strength is 205 MPa and the rolling direction (0°, 45° and 90°) has little effect on the tensile strength. A temperature fluctuant range of 2℃ in tensile test is found. The B4C particles plays a reinforce role in the composites and the microstructure damage is dominated by interface debonding and Al tearing. © 2016, Editorial Office of Materials Science and Engineering of Powder Metallurgy. All right reserved.


Guo R.,Taiyuan University of Technology | Zhao H.-H.,Taiyuan University of Technology | Wang Y.,Shanxi Coal Mining Administrators College
Nonlinear Dynamics | Year: 2016

Under investigation in this paper is a generalized coupled nonlinear Schrödinger system with higher-order terms, which describes the propagation properties of ultrashort solitons in two ultrashort optical fields. Based on the 3 (Formula presented.) 3 lax pair, the N-fold Darboux transformation (DT) has been constructed. Several kinds of solitons, breathers, and rogue wave solutions are generated on the vanishing and nonvanishing backgrounds by virtue of the DT. Figures are plotted to reveal the dynamic features of those solutions: (1) elastic interactions between two solitons; (2) mutual attractions and repulsions of bound solitons; (3) propagation properties of Ma-breathers, Akhmediev breathers, two-breathers, and rogue waves. The results show that the rogue waves can result from two different ways: the limit process of Ma-breathers and Akhmediev breathers. © 2015, Springer Science+Business Media Dordrecht.


Zhao W.,Shanxi University | Chao J.,Shanxi University | Du R.,Shanxi Coal Mining Administrators College | Huang S.,Shanxi University
Journal of Inclusion Phenomena and Macrocyclic Chemistry | Year: 2011

To investigate the inclusion ability of γ-cyclodextrin (γ-CD) for caffenic acid (CA). The conditions for the formation of inclusion complex and the binding constant between γ-CD and CA were determined by fluorescent and ultraviolet spectroscopic methods. The behavior of CA as a free radical scavenger before and after its inclusion was investigated. In addition, solid samples of the inclusion complex, prepared through the co-precipitation and grinding methods, were characterized via IR spectroscopy and differential scanning calorimetry. The inclusion complex was further characterized with 1H NMR spectroscopy. By using fluorescent and ultraviolet spectroscopy, the conditions for the formation of inclusion complex between γ-CD and CA were optimized and the binding constant determined. It was observed that the guest molecule behaves as a better anti-oxidant after its inclusion into γ-CD. © 2011 Springer Science+Business Media B.V.


Nie H.,Taiyuan University of Technology | Nie H.,Shanxi Coal Mining Administrators College | Liang W.,Taiyuan University of Technology | Zheng L.,Taiyuan University of Technology | And 3 more authors.
Journal of Materials Engineering and Performance | Year: 2016

Two types of three-layered Al/Mg/Al clad sheets were fabricated by hot rolling. The first (sheet A) underwent a single pass with a small rolling reduction of 33% and the second (sheet B) underwent four passes with a large rolling reduction of 71%, and both were subsequently annealed at 200 °C for 1 h. Microstructural examination and tensile tests on the fabricated sheets revealed that 17.8-μm-thick intermetallic compound layers (IMCLs) appeared at AZ31/5052 interfaces in sheet B while none were observed in sheet A. The AZ31 layers in sheets A and B exhibited basal textures with intensities of 15.1 and 9.8, respectively, and only sheet A exhibited tensile twins (TTs) in the AZ31 layer. Recrystallization resulting in grains was preferred near the AZ31/5052 interface and the intersections between TTs. Owing to its larger rolling reduction, more extensive recrystallization was observed in the sheet B component layers than in sheet A. Sheet B exhibited better mechanical properties with a much higher ultimate tensile strength (UTS) than sheet A (230 versus 102 MPa) and a slightly larger elongation (19 versus 17%).This indicates that texture intensities and the extent of recrystallization of component layers have a significant effect upon the mechanical properties of clad sheets. © 2016 ASM International


Wu M.-Q.,CAS Institute of Remote Sensing Applications | Wang J.,Hangzhou Normal University | Niu Z.,CAS Institute of Remote Sensing Applications | Zhao Y.-Q.,Shanxi Coal Mining Administrators College | Wang C.-Y.,CAS Institute of Remote Sensing Applications
Hongwai Yu Haomibo Xuebao/Journal of Infrared and Millimeter Waves | Year: 2012

Spatial and temporal fusion of remote sensing data is a technology that can generate dense time series and high spatial resolution data whose spatial resolution is similar with high spatial resolution date, and temporal resolution is the same as the one with high temporal resolution data. This paper presented a new spatial and temporal data fusion model (STDFM) for blending Landsat and MODIS surface reflectance. Temporal change information was detected from sequence coarser resolution surface images, and new high resolution reflectance was predicted from former high resolution reflectance. This algorithm was tested in red and near-infrared MODIS and Landsat ETM+ images, and over a study area in Jiangning country, Nanjing, Jiangsu, China. Results showed that STDFM was able to produce images very similar with actual observed images. The correlation coefficient r between synthetic imageries and actual observations was 0.939. The correlation coefficient r between NDVI calculated by synthetic imageries and actual observations was 0.938.


Hu C.X.,China University of Mining and Technology | Hu C.X.,Shanxi Coal Mining Administrators college | Liu J.K.,China University of Mining and Technology | Li Q.,China University of Mining and Technology | Zhang Y.,China University of Mining and Technology
Applied Mechanics and Materials | Year: 2014

The gob of small colliery has been one of the main factors threatening the safe production of coal mine. The repeated mining working face in a certain mine is the practical engineering background in this paper to study the influence of gob in small colliery on the mining of lower layer. By using the numerical simulation software FLAC3D, the stress distribution law and the change of displacement during lower layer mining were analysed. It can be concluded from the analysis of field measurement data that: there is stress relief under the gob of small colliery because the distribution of coal is irregular resulting from the random distribution of gobs in small colliery, while the residual coal causes the effect of stress concentration on the lower layer mining; relatively large displacement appears in the caving zone of the upper layer by the roof of working face and the support should be strengthened appropriately during mining; meanwhile, the gob of small colliery can cause the nonuniform distance of periodic weighting in the roof, and segmented pressure behavior can be observed during the periodic weighting of the working face. Research results could provide some guidance to the safe and efficient production in repeated mining working face in the mining with similar conditions. © (2014) Trans Tech Publications, Switzerland.


Chen H.S.,Taiyuan University of Technology | Wang W.X.,Taiyuan University of Technology | Li Y.L.,Taiyuan University of Technology | Zhang P.,Taiyuan University of Technology | And 2 more authors.
Journal of Alloys and Compounds | Year: 2015

Based on the Monte Carlo Particle transport program MCNP, a novel boron carbide particulate reinforced 6061Al composite for neutron shielding (B4C/6061Al NACs) with high strength and low density was designed. The NACs with four volume fractions (10%, 20%, 30% and 40%) were successfully fabricated by vacuum hot pressing followed by hot rolling (VPHR) in atmospheric environments. The calculation results indicated that the neutron transmission ratio decreased with the increasing of B4C content and the thickness of plates. B4C particle is uniformly distributed in the matrix, exhibiting the good bonding in interface. The phases of neutron absorbers were mainly B4C and Al, and a spot of AlB2 and Al3BC. The grain of the matrix was refined and the dislocation was formed around the particles. With increasing the B4C content, the particles gathered, breakage appeared, and the tensile strength of composite first increased and then decreased. The failure mode of B4C/6061Al NACs included: the interfacial debonding and the cleavage fracture of particles. © 2015 Published by Elsevier B.V.


Nie H.,Taiyuan University of Technology | Nie H.,Shanxi Coal Mining Administrators College | Liang W.,Taiyuan University of Technology | Yang F.,Taiyuan University of Technology | And 5 more authors.
JOM | Year: 2016

Three-layered 5052/AZ31/5052 clad sheets with maximum rolling reductions of 33% and 48% were prepared, using single-pass hot rolling followed by thermal annealing at 200°C for 1 h. The evolutions of microstructures and textures were analyzed. The experimental results show that the AZ31 layer exhibited a typical deformation microstructure with rolling-induced twins. The AZ31 layer with the 33% rolling reduction possessed a texture with the basal pole tilting about 35° away from normal direction to transverse direction and the majority of twins consists of {101 ¯ 1}–{101 ¯ 2} double twins and {101 ¯ 2} tensile twins. The AZ31 layer with the 48% rolling reduction possessed a typical basal texture because {101 ¯ 1} compression twins were activated by c-axis strain to compete with the tensile twins. No intermetallics were observed after annealing, and recrystallization occurred preferentially at the interface between AZ31 and 5052. The typical rolling texture of the 5052 layer disappeared, and the stable {001} 〈110〉 rotation cube component was dominant. The tensile test of the rolled three-layered 5052/AZ31/5052 clad sheets was performed. The tensile experimental results show that the annealed clad sheets with 33% rolling reduction and smaller degree of recrystallization have the largest elongation of 22.5% and larger ultimate tensile strength (UTS) than the annealed clad sheets with 48% rolling reduction. © 2016, The Minerals, Metals & Materials Society.


Wei C.C.,China University of Mining and Technology | Hu C.X.,Shanxi Coal Mining Administrators college | Yu Z.W.,China University of Mining and Technology
Advanced Materials Research | Year: 2014

The coal production capacity is determined by many factors, such as geological conditions, production conditions, transportation conditions, environmental factors, coal reserves and so on. The coal reserves play a fundamental role in these factors. Therefore, this paper analyzes whether existing reserves in Shanxi Province could support coal production target which is made by government of Shanxi Province after the integration of coal resources from the perspective of coal reserves. The purpose of this paper is to achieve better sustainable development of coal resources in Shanxi Province. © (2014) Trans Tech Publications, Switzerland.


Chao J.,Shanxi University | Su J.,Shanxi University | Li J.,Shanxi University | Zhao W.,Shanxi University | And 2 more authors.
Supramolecular Chemistry | Year: 2011

The formation of the complexes of baicalein (Ba) with β-cyclodextrin (β-CD) and β-CD derivatives (HP-β-CD and Me-β- CD) was studied by UV-vis absorption spectroscopy, fluorescence method, nuclear magnetic resonance spectroscopy and phase-solubility measurement. The solid-inclusion complexes of Ba with CDs were synthesised by the co-precipitation method. The characterisations of the solid-inclusion complexes have been proved by infrared spectra and differential scanning calorimetry. Experimental conditions including the concentration of various CDs and media acidity were investigated in detail. The results suggested that the inclusion ratio of HP-β-CD with Ba was the highest among the three kinds of CDs. The binding constants (Ks) of the inclusion complexes were determined by fluorescence method and phasesolubility measurement. Kinetic studies of DPPHz with Ba and CDs complexes were also done. The results indicated that the Ba/HP-β-CD complex was the most reactive form. © 2011 Taylor & Francis.

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