91439 Unit

Liaoning, China

91439 Unit

Liaoning, China
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Shao J.-J.,Post Doctoral Scientific Research Station in 92493 Unit | Shao J.-J.,Wuhan Naval University of Engineering | Zhu X.,Wuhan Naval University of Engineering | Zhang Y.-K.,91439 Unit | Wang M.-G.,91439 Unit
Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology | Year: 2012

Co3O4/CeO2 catalyst was prepared by co-precipitation-oxidation method. Adsorption of carbon monoxide and the co-adsorption of CO/O2 over Co3O4/CeO2 sample were investigated. In situ FT-IR analysis of the mechanism in CO oxidation was interpreted over Co3O4/CeO2 sample. Effects of the reaction conditions on the catalytic performance over Co3O4/CeO2 catalyst for carbon monoxide oxidation was investigated at humid and dry conditions. Results indicated that the addition of cerium to the cobalt oxide was beneficial for CO oxidation over Co3O4 at humid condition. The formation of carbonate species with reaction on Co3O4/CeO2 composite oxide slightly deactivated the catalyst. When the temperature was as low as 453 K, the dynamic equilibrium of formation and decomposition of carbonate species existed in Co3O4/CeO2 composite oxide catalyst. The carbonate species disappeared above 493 K. The strong interaction between CeO2 and Co3O4 may contribute to the excellent water resistance for low-temperature CO oxidation over Co3O4/CeO2 catalyst at humid condition.

Gong G.-T.,91439 Unit | Jin H.,91439 Unit | Zhang S.-H.,91439 Unit | Zhou Q.-F.,91439 Unit
Binggong Xuebao/Acta Armamentarii | Year: 2010

The damaging effects of underwater explosion on naval ships and the significance of research on the underwater explosion resisting were analyzed. The summary of the research on ships' anti-explosion capacities abroad was given from five perspectives, including theoretical analyses, experiments, simulations, damaging evaluation and criterions and anti-shock protections, some suggestions about the research on the anti-explosion of naval ships in our country were proposed also.

Jin H.,91439 Unit | Li B.,91439 Unit | Quan L.,91439 Unit | Song J.-L.,91439 Unit
Baozha Yu Chongji/Explosion and Shock Waves | Year: 2013

A series of experiments were carried out to explore the energy output characteristics of the explosive in the different underwater boundary conditions: free field, water bottom, near water bottom and near water surface. The experimental results show that when the explosive is near the water bottom and surface, the boundary conditions weakly affect the explosion-induced shock waves and strongly influence the bubble pulsation. When the distance from the explosive to the water bottom is less than the maximum radius of the bubbles, the underwater explosion of the explosive fails to form an integrated bubble pulsation resulted from the water bottom boundary. When the distance from the explosive to the water surface is less than the maximum radius of the bubbles, the air bubbles overflow the water surface and fail to form the bubble pulsation pressure. When the distance from the explosive to the water surface is 1-1.5 times as great as the maximum radius of the bubbles, partial air bubbles overflow the water surface and the corresponding bubble pulsation pressure is lower than that induced by the explosion in the free field. Because of the air bubble rising in its expansion and contraction processes, the influenced range by the water surface on the bubble pulsation is larger that by the water bottom.

Jin H.,91439 Unit | Zhou X.-B.,91439 Unit | Xi H.-W.,91439 Unit | Liu W.-S.,91439 Unit
Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology | Year: 2016

In the field of ship building and marine engineering, investigations the mechanics and motion characteristics of structures in the flow field and the reaction of structures to the flow field are significant to many aspects. In the present paper, a sphere-into-water model was established using ABAQUS based on the coupled Euler-Lagrangian (CEL) method, which was verified effectively after comparing the numerical results of spheres made by two materials into water with experimental data. According to the established model of the sphere into water, the iterative time step plays more important role than that of Poisson's ratio. It is observed that the change of iterative time step will bring more impacts than the other parameters. © 2016, Editorial Department of Transaction of Beijing Institute of Technology. All right reserved.

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