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Nanchang, China

Ji K.,Beijing University of Chemical Technology | Dai H.,Beijing University of Chemical Technology | Dai J.,Nanchang Military Academy | Deng J.,Beijing University of Chemical Technology | And 3 more authors.
Catalysis Today | Year: 2013

Three-dimensional (3D) macroporous perovskite-type oxides SrFeO 3-δ (i.e., SFO-xEG, x = 1, 3, and 6) with a cubic perovskite structure have been prepared using the citric acid-assisted poly(methyl methacrylate)-templating method in the presence of a certain amount (1, 3 or 6 mL) of ethylene glycol (EG). The physicochemical properties of the materials were characterized by means of numerous techniques and their catalytic activities were evaluated for toluene combustion. It is shown that the SFO-3EG sample possessed the best pore quality and highest surface area (ca. 34 m 2/g). Most of the pores of SFO-xEG (x = 1, 3, and 6) were ca. 72, 52, and 64 nm, respectively. There was a good relationship of surface area, oxygen adspecies concentration, and low-temperature reducibility with catalytic performance of the sample (i.e., SFO-3EG > SFO-6EG > SFO-1EG > SFO-bulk). The SFO-3EG catalyst performed the best, giving a T50% of ca. 270 °C and a T90% of ca. 310 °C at space velocity = 5000 mL/(g h). It is concluded that the good catalytic performance of SFO-3EG was associated with its large surface area, high oxygen adspecies concentration, and good low-temperature reducibility as well as the high-quality 3D macroporous structure. © 2012 Elsevier B.V. Source


Rong B.,Nanjing University of Science and Technology | Rong B.,Nanchang Military Academy | Rui X.,Nanjing University of Science and Technology | Tao L.,CAS Hefei Institutes of Physical Science
Journal of Applied Mechanics, Transactions ASME | Year: 2012

The rapid computation of random eigenvalue problems of uncertain structures is the key point in structural dynamics, and it is prerequisite to the efficient dynamic analysis and optimal design of structures. In this paper, by combining finite element-transfer matrix method (FE-TMM) with perturbation method, a new method named as perturbation FE-TMM is presented for random eigenvalue problems of uncertain structures. By using the proposed method, the rapid computation of random eigenvalue problems of uncertain structures with complicated shapes and boundaries can be achieved, and the repeated eignvalues and characteristic vectors can be solved conveniently. Compared with stochastic finite element method, this method has the low memory requirement, high computational efficiency and high computational stability. It has more advantages for dynamic design of uncertain structures. Formulations as well as some numerical examples are given to validate the method. © 2012 American Society of Mechanical Engineers. Source


Wang G.,Nanjing University of Science and Technology | Rong B.,Nanjing University of Science and Technology | Rong B.,Nanchang Military Academy | Tao L.,CAS Hefei Institutes of Physical Science | Rui X.,Nanjing University of Science and Technology
Journal of Applied Mechanics, Transactions ASME | Year: 2012

Efficient, precise dynamic modeling and control of complex underwater towed systems has become a research focus in the field of multibody dynamics. In this paper, based on finite segment model of cable, by defining the new state vectors and deducing the new transfer equations of underwater towed systems, a new highly efficient method for dynamic modeling and simulation of underwater towed systems is presented and the pay-out/reel-in process of towed cable is studied. The computational efficiency and numerical stability of the proposed method are discussed. When using the method to study the dynamics of underwater towed systems, it avoids the global dynamic equations of system, and simplifies solving procedure. Irrespective of the degree of freedom of underwater towed system, the matrices involved in the proposed method are always very small, which greatly improve the computational efficiency and avoids the computing difficulties caused by too high matrix orders for complex underwater towed systems. Formulations of the method as well as numerical simulations are given to validate the proposed method. Copyright © 2012 American Society of Mechanical Engineers. Source


Xie A.,Shandong University | Liu H.,Shandong University | Qin F.,Jiangxi Normal University | Zeng Z.,Nanchang Military Academy
Information Sciences | Year: 2012

This paper investigates an iterative Boolean-like law with fuzzy implications derived from uninorms. More precisely, we characterize the solutions to the functional equation I(x, y) = I(x, I(x, y)) that involve RU-, (U, N)- and QLU-implications generated by the most usual classes of uninorms. © 2011 Elsevier Inc. All rights reserved. Source


Xu W.-M.,Nanchang Military Academy
Xitong Fangzhen Xuebao / Journal of System Simulation | Year: 2012

Allocation of assault in wargames is critical to decide whether combat units can bring their full potential as a whole into play. Concerning wargames rules and ad hoc assault characteristics, an optimal assault allocation model was proposed based on experimental rules and operation analysis method. A genetic algorithm with detailed steps was employed to find the global optimal allocation of assault resources. Experimental results prove that the proposed algorithm can effectively allocate assault resources in wargames system and offers a reference for wargames playing and Computer Generated Forces simulations. Moreover, this is also very important for commanders both in rehearsal and real combat. Source

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