Changchun University of Technology

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Wang J.,Changchun University of Technology
Operations Research Letters | Year: 2017

In this study, we consider the new trend of counterterror measures and the economic growth differential game. The feedback Nash equilibrium of this game is acquired by dynamical programming. We also characterize the feedback strategies for the government and terrorist organization. The optimal strategy in our study is then compared with a two-player zero-sum feedback equilibrium reported previously. Finally, we discuss the effectiveness of the counterterror game. © 2017 Elsevier B.V.


Han Z.,Changchun University of Technology
Revista de la Facultad de Ingenieria | Year: 2017

In this paper, the effects of compound natural antioxidant on anti-fatigue and protection against oxidative stress injury induced by exercise were studied by high-intensity endurance training and exhaustive swimming injury model. It was found through the experimental study on rats that the compound natural compound antioxidant or endurance training in rats do have certain effect on the anti-fatigue, anti-free radical injury protection and regulation of energy metabolism in the body, but the combination of the two can make its effect significantly improved. Therefore, in the process of exercise training, proper supplementation of compound natural antioxidant can improve the training effect of athletes.


Shan Y.,CAS Changchun Institute of Applied Chemistry | Shan Y.,Changchun University of Technology | Wang H.,CAS Changchun Institute of Applied Chemistry | Wang H.,University of Chinese Academy of Sciences
Chemical Society Reviews | Year: 2015

The cell membrane is one of the most complicated biological complexes, and long-term fierce debates regarding the cell membrane persist because of technical hurdles. With the rapid development of nanotechnology and single-molecule techniques, our understanding of cell membranes has substantially increased. Atomic force microscopy (AFM) has provided several unprecedented advances (e.g., high resolution, three-dimensional and in situ measurements) in the study of cell membranes and has been used to systematically dissect the membrane structure in situ from both sides of membranes; as a result, novel models of cell membranes have recently been proposed. This review summarizes the new progress regarding membrane structure using in situ AFM and single-molecule force spectroscopy (SMFS), which may shed light on the study of the structure and functions of cell membranes. © The Royal Society of Chemistry 2015.


Xu H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Guan Y.-J.,Changchun University of Technology
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2013

A novel flexible support structure for the 1-m primary mirror of a space camera was introduced. By taking the material selection, diameter-thickness ratio, number and positions of support points, and lightweight forms as design variables and the surface figure accuracy rms of the mirror under the self-weight as objective function, a kind of back opening SiC space mirror with triangle lightweight holes and three-point support on the back was designed optimally. Then, the flexible support structure was designed for the primary mirror. Through sensitivity analysis, the parameters of flexible support structure that effect on rms of mirror were found when its optical axis was on the horizontal state. By using finite element method, the dynamic and static stiffnesses as well as thermal character of the primary mirror subassembly were analyzed. The results indicate that surface accuracy of the mirror has reached rms 5.6 nm and 2.7 nm under gravity perpendicular to optical axis and a uniform temperature rise of 4°C, respectively, and the fundamental frequency of the primary mirror subassembly is 192 Hz. Finally, dynamics test was performed in the laboratory, experimental results indicate that the first-order natural frequency is 197 Hz and the maximum stress is 181 MPa, which verifies the accuracy of FEA. Obtained results satisfy the requirements of space application.


Wang X.,Changchun University of Technology
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2011

This paper attempts to improve the commonly used image multi-focus fusion methods, for they could not identify meaningful image features from noises. An antinoise multi-focus image fusion algorithm is presented. The improved adaptive block-based image fusion algorithm combined with a new focus measure with noise immunity is used to focus the noisy image effectively and to achieve good fusion results. Root Mean Square Error (RMSE) and Mutual Information (MI) are selected to evaluate the fused noisy image with different intensities and comparison experiments are performed. As compared with those of contrast pyramid, wavelet transform and Contourlet transform, the average RMSE of the fused image by the proposed method has been decreased by 4.2889, 4.4791 and 4.1871 respectively, while the average MI increased by 2.3664, 3.2825 and 2.0639, respectively. With the noise interference, the proposed method can maintain the useful information of the source images accurately, suppress noise effects effectively and obtain better image fusion quality.


Ye W.L.,Changchun University of Technology
Advanced Materials Research | Year: 2014

With cobalt-based catalyst loaded by Al2O3, TiO2 and ZrO2 as research objectives, in this paper, the performance of these cobalt-based catalysts in Fischer-Tropsch synthesis is discussed. Besides, BET, XRD, FTIR, TPR superficial characteristics and evaluation experiments have been carried out for these catalysts respectively, and the result shows that, the catalyst loaded by ZrO2 has the highest catalytic activity, while the catalyst loaded by Al2O3 has the lowest catalytic activity. The catalyst with higher CO adsorption and dissolving capacity has higher activity; meanwhile, the higher reducibility the catalyst has, the higher the activity of the catalyst will be. In addition, catalyst methane selectivity loaded by Al2O3 is the highest, while catalyst methane selectivity loaded by TiO2 is the lowest, which shows that the large pore structure of catalyst is good for heavy hydrocarbon production, meanwhile, formate species generated on the surface of catalyst implies that the formate species is involved in the generation of methane. © (2014) Trans Tech Publications, Switzerland.


Sun L.,Changchun University of Technology | Zhao Z.,Changchun University of Science and Technology | Zhou Y.,CAS Changchun Institute of Applied Chemistry | Liu L.,Changchun University of Technology
Nanoscale | Year: 2012

Owing to their extensive practical applications and fundamental importance, the controllable synthesis of well-faceted anatase TiO 2 crystal with high percentage of reactive facets has attracted increasing attention. Here, nano-sized anatase TiO 2 sheets mainly dominated by {001} facets had been prepared on graphene sheets by using a facile solvothermal synthetic route. The percentage of {001} facets in TiO 2 nanosheets was calculated to be ca. 64%. The morphologies, structural properties, growth procedures and photocatalytic activities of the resultant TiO 2/graphene nanocomposites were investigated. In comparison with commercial P25 and pure TiO 2 nanosheets, the composite exhibited significant improvement in photocatalytic degradation of the azo dye Rhodamine B under visible light irradiation. The enhancement of photocatalytic activity and stability was attributed to the effective charge anti-recombination of graphene and the high catalytic activity of {001} facets. © 2012 The Royal Society of Chemistry.


Zhang N.,Changchun University of Technology
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2011

The system is decomposed into the input-output subsystem and the zero dynamics subsystem for flexible manipulators with uncertain parameters through the output of manipulators system is redefined. The neural sliding mode control strategy is proposed for the input-output subsystem. The weights of the radial basis function (RBF) neural network is adjusted online to meet sliding mode arrived conditions. It can guarantee the output of the network to approach non-singular terminal sliding mode control input of the system and avoid chattering phenomenon. The zero dynamics subsystem is approximately linearized nearby the equilibrium point to select the design control parameters. Simulation experiment results demonstrate that the method fulfills the accurate point to point control of the flexible manipulator, and the elastic vibration at the end of flexible manipulator is eliminated. © 2011 Journal of Mechanical Engineering.


Mei J.,Changchun University of Technology | Zhang L.,Changchun University of Technology
RSC Advances | Year: 2015

A controllable ultrasonic-assisted self-assembly process is used for the fabrication of novel β-MnO2 nano-branched-graphene composites by branched β-MnO2 interwoven with flake graphene. The composites demonstrate high activity in catalytic oxidation of a methylene blue (MB) model. Roles of different components in the composites were confirmed and the optimum reaction conditions were also investigated. By cyclic tests, the composites show excellent chemical stability. Finally, the catalytic oxidation steps were further studied by analysis of the products. These results will contribute to the wide applications of the new composites in the catalytic oxidation of other aromatic compounds. © The Royal Society of Chemistry 2015.


He W.,CAS Changchun Institute of Applied Chemistry | Jiang C.,CAS Changchun Institute of Applied Chemistry | Wang J.,Changchun University of Technology | Lu L.,CAS Changchun Institute of Applied Chemistry
Angewandte Chemie - International Edition | Year: 2014

Nitrogen-doped species (NDs) are theoretically accepted as a determinant of the catalytic activity of metal-free N-doped carbon (NC) catalysts for oxygen reduction reaction (ORR). However, direct relationships between ND type and ORR activity have been difficult to extract because the complexity of carbon matrix impairs efforts to expose specific NDs. Herein, we demonstrate the fabrication of a 3D hierarchically porous NC catalyst with micro-, meso-, and macroporosity in one structure, in which sufficient exposure and availability of inner-pore catalytic sites can be achieved due to its super-high surface area (2191 cm 2-g-1) and interconnected pore system. More importantly, in-situ formation of graphitic-N species (GNs) on the surface of NC stimulated by KOH activation enables us to experimentally reveal the catalytic nature of GNs for ORR, which is of great significance for the design and development of advanced metal-free NC electrocatalysts. Spotlighting nitrogen: Preferential exposure of graphitic-N species (GNs) on the surface of bi-continuous N-doped carbon (NC) films that feature hierarchically porous frameworks has been achieved. This unique design was used to identify the catalytic nature of GNs which paves the way to developing highly active metal-free NC electrocatalysts for oxygen reduction. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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