Tangshan University

Tangshan, China

Tangshan University

Tangshan, China
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Ma X.Z.,Yanshan University | Ma D.Q.,Yanshan University | Ma D.Q.,Tangshan University | Xu H.,Shandong University | And 4 more authors.
Journal of Non-Crystalline Solids | Year: 2017

Combining copper mold suction-casting and copper mold pouring-casting techniques, in-situ Ti-based bulk metallic glass matrix composites (Ti0.45Zr0.31Be0.17Cu0.07)100 − xNbx (x = 4, 6, 8 and 10) with Φ = 3 mm and composites (x = 6, 8 and 10) with Φ = 8 mm are fabricated in order to perform compressive and tensile tests, respectively. The volume and size of crystalline β-Ti(Zr, Nb) dendrites of these composites increase with the increasing Nb content, resulting in the improvement of compressive and tensile properties of the composites. Among these composites, Ti40.5Zr27.9Be15.3Cu6.3Nb10 (x = 10) has the highest compressive ultimate strength of 2756 MPa and plastic strain of 39.5%; meanwhile, it possesses a high tensile ultimate strength of 1428 MPa and a large tensile plasticity of 7.7%. As indicated by the SEM micrographs, in compressive tests, the more branched the dendrites, the more shear bands, and the higher compressive strength and plasticity of these composites. In tensile tests of Ti40.5Zr27.9Be15.3Cu6.3Nb10 (x = 10), ductile fracture features, including the macroscopic necking, fracture of ligament, vein patterns and sliding traces, are observed. The reason of the excellent mechanical properties of the measured composites is that the propagation of shear bands and cracks are impeded by β-Ti(Zr, Nb) dendrites, and then be confined in a small space. © 2017 Elsevier B.V.

Yu J.-Y.,Yanshan University | Yu J.-Y.,Tangshan University | Wang L.-K.,Yanshan University | Wang L.,Yanshan University | And 2 more authors.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2016

Firstly, the characteristics and applications of FTO thin film were introduced briefly in this paper. Then, the preparation methods and research progresses of FTO thin film, such as sol-gel, magnetron sputtering, chemical vapor deposition and spray pyrolysis method, were overall reviewed. Finally, the perospect of synthesis technology and theoretical design of FTO thin film were discussed. © 2016, Chinese Ceramic Society. All right reserved.

Ren G.F.,Tangshan Design and Research Institute of Buildings | Qiao J.S.,Tangshan University
Applied Mechanics and Materials | Year: 2013

This paper takes Nanhu project of Tangshan City under the soil condition of foundation pit excavation as an example. A model is established to research on the mechanical behavior effect of around composite foundation of CFG under soil lateral displacement by using ANSYS finite element software. The model analyzes the distribution law of horizontal displacement, stress of pile, soil between piles of CFG composite foundation under soil lateral displacement. Put forward a calculation formula of pile displacement by considering excavation depth, excavation distance. © (2013) Trans Tech Publications, Switzerland.

Huang L.,Beijing University of Technology | Huang L.,Beijing Institute of Technology | Liu Z.,Beijing University of Technology | Liu Y.,Beijing University of Technology | And 3 more authors.
Experimental Thermal and Fluid Science | Year: 2012

The effect of contact angle on water droplet freezing process on a cold flat surface under natural convection conditions was experimentally investigated. A series of hydrophobic surfaces with different contact angles were prepared by solution immersion. The contact angles of these surfaces were varied from 97.2° to 154.9°. Comparative observations of water droplet freezing processes were carried out on both plain copper surface and these hydrophobic surfaces under the same conditions. The experimental results showed that the contact angle has a strong influence on the water droplet freezing time. The larger the contact angle is, the longer the freezing time. The frost crystals growth on the droplet surface that frozen on the hydrophobic surface is faster and presents a pattern that is more dendritic than that on the plain copper surface. © 2012 Elsevier Inc.

Gou Y.-J.,Beijing University of Technology | Gou Y.-J.,Tangshan University | Liu Z.-L.,Beijing University of Technology
Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | Year: 2012

A new cooling concept for high power LED by combining the heat release of high power LED with two-phase heat transfer heat pipes was proposed, and in this study a series of heat pipes with specific fins structure were developed. From the experimental results obtained, it is found that the new heat pipe heat exchanger is of high heat dissipation capacity and compact construction that will meet the demand of high power LED cooling. The new heat pipe heat exchangers with different fin shapes have different efficiency of heat dissipation and the new heat exchanger with outwards-radiate fins has the best heat dissipation performance. It is also shown that the heat dissipation performance of the heat pipe heat exchanger changes with the position angle. The effects of the numbers of heat pipes and the fin materials on the heat dissipation performance of the whole cooling system were also carried out.

Hao T.,Beijing University of Technology | Hao T.,Tangshan University | Cao W.,Beijing University of Technology | Dong H.,Beijing University of Technology | And 2 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2016

In order to research the collaborative work performance between steel plate and concrete wall with high axial compression ratio for embedded steel plate-concrete composite shear walls, four 1/4 scaled wall specimens were tested under axial compression to simulate the core tube shear wall in China Zun Tower. The overall dimensions were identical for four specimens. The main test parameter was the constructional measure for the bonding between steel and concrete. The bearing capacity, stiffness degradation, strain distribution and deformation capacity were compared and analyzed with the method of one-way repeated loading. The axial compressive bearing capacity was calculated. The results show that the axial force sharing ratio of steel plate is between 25% and 32%, so the embedded steel plates behave well in compression at ultimate load. Compared with the specimen without lacing wires and studs, the bearing capacity and the axial deformation of the specimen with long studs are improved by 23.6% and 22.6%, the stiffness degradation is slowed down by 17.42%. The specimen with long studs exhibits good collaborative work performance. The strength superposition theory is adopted when the axial compression bearing capacity of the embedded steel plate-concrete composite shear walls is calculated. The test results are in good agreement with the calculated values. © 2016, Editorial Office of Journal of Building Structures. All right reserved.

Huang L.,Beijing University of Technology | Liu Z.,Beijing University of Technology | Liu Y.,Beijing University of Technology | Gou Y.,Beijing University of Technology | Gou Y.,Tangshan University
International Journal of Thermal Sciences | Year: 2011

A flower-like super-hydrophobic surface on the copper foil was fabricated by means of a facile method using solution immersing. The water contact angle of this surface was measured to be as high as 156.2° after modified with fluoroalkylsilane (FAS) coating. To study its effect on frost deposition, a series of micro-observations of the water droplets formation, initial frost crystals growth and frost layer melting process were carried out on both the super-hydrophobic surface and the plain copper foil surface. The experimental results show that the water droplets condensed on the super-hydrophobic were smaller and present a more spherical shape when compared with that on the plain copper foil surface. The freezing time of the droplets on the super-hydrophobic surface was later than that on the plain copper foil surface. Moreover, the super-hydrophobic surface can restrain initial frost crystals formation for 20 min after exposed to the air for one month. The mechanism of surface hydrophobicity influence on droplets frozen and frost formation was analyzed theoretically based on the surface wettability and the phase transition theory. © 2010 Elsevier Masson SAS. All rights reserved.

Zhong X.,Hebei Polytechnic University | Zhai Y.,Hebei Polytechnic University | Gou Y.,Tangshan University
Applied Mechanics and Materials | Year: 2011

The airflow change in cold storage were simulated by FLUENT under following three conditions, pre-cooling, stop to defrost and switch cold storage door. The result shows that the pre-cooling wind speed should be chose reasonably while guarantees the pre-cooling effort, hot air defrost had a favorable defrosting performance, and it is essential to seek optimal defrosting time according to the frost thickness and energy consume. The temperature field near the switch door was analyzed, and the temperature gradient near the switch door is considerable, but the outdoor air can be obstructed by increase air curtain. © (2011) Trans Tech Publications.

Dou C.,Yanshan University | Dou C.,Tangshan University | Jing X.,Yanshan University | Li S.,Yanshan University | And 2 more authors.
Plasmonics | Year: 2015

A single-polarization photonic crystal fiber (PCF) based on surface plasmon resonance (SPR) is proposed. Finite element method is employed in simulating the PCF with gold-coated. The resonance wavelength can be modulated by changing the thickness of gold layer. At the resonance wavelength 1.55 μm, the loss of y-polarized mode is much larger than the loss of x-polarized mode. When the fiber length is set to 2 mm, the value of extinction ratio reaches to −118.7 dB, the y-polarized mode is suppressed and only x-polarized mode can be guided. The fiber is applicable in the production of single-polarization filter. The PCF has a simple structure and a big error tolerance, it has a good practicability. © 2015 Springer Science+Business Media New York

Kang H.,Tangshan University | Zhang K.,University of Science and Technology of China | Ma W.,Tangshan University | Meng Q.,Tangshan University
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2015

In order to investigate stress-strain curves of ferrous tailing concrete, concrete of C20-C55 strength grades were made with ferrous tailing displacing natural sand. Three specimens with dimension of 70 mm×70 mm×210 mm in each group were tested under axial compression. Stress-strain curves of ferrous tailing concrete with different strength were obtained. Meanwhile, stress-strain curves of common concrete specimens were obtained through test. Comparative analysis indicates that the peak stress, strain, initial elastic modulus, the peak secant modulus, point of inflection and point of convergence of stress-strain curves of ferrous tailing concrete and common concrete with strength grade lower than C40 are similar. The experimental stress-strain curves of ferrous tailing concrete coincide with code curves. When the strength grade is larger than C40, the descent stage of stress-strain curves of ferrous tailing concrete is steeper than Code (GB 50010-2010) curves of common concrete. Then, the stress-stain curves of ferrous tailing concrete with strength grade larger than C40 are fitted. © 2015, Science Press. All right reserved.

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