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Guan Y.-J.,Changchun University of Technology
Guangdian Gongcheng/Opto-Electronic Engineering | Year: 2010

The methods of establishing ring bonds finite element model-detailed model and equivalent stiffness model are elaborated in order to research the effect of systems with adhesive. Uniform changing temperature load cases are analyzed through the equivalent stiffness model, and then the results from FEA is compared to the actual tests. Some of factors which affect surface figure errors such as Poisson's ratio of adhesive, bonded position, bonds width, bonds thickness etc., are analyzed for optimal design. Choosing an optimal project, the dimension stability of the focusing mirror component is fully analyzed. Besides eccentricity bonds caused by inaccurate bonding process are also researched within the same model. The analysis result shows that the properties of ring bonds can be properly represented by equivalent stiffness model. The optimal design can meet the tolerance demand, and avoid the influence induced by eccentricity bonds. Source


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. Source


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. Source


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. Source


Liu B.,Northeast Normal University | Liu B.,Jilin Normal University | Yang J.,Northeast Normal University | Yang G.-C.,Changchun University of Technology | Ma J.-F.,Northeast Normal University
Inorganic Chemistry | Year: 2013

Four novel polyoxometalate-based copper(I)-organic frameworks, namely, [CuI 2(cis-L1)2][CuI 2(trans-L1)2Mo6O18(O 3AsPh)2] (1), [CuI 4(L2) 4Mo6O18(O3AsPh)2] (2), [CuI 4(L3)4Mo6O18(O 3AsPh)2] (3), and [CuI 4(L4) 2Mo6O18(O3AsPh)2] (4) (L1 = 1,3-bis(1,2,4-triazol-1-yl)propane, L2 = 1,4-bis(1,2,4-triazol-1-yl)butane, L3 = 1,5-bis(1,2,4-triazol-1-yl)pentane, and L4 = 1,6-bis(1,2,4-triazol-1-yl) hexane), have been successfully synthesized under hydrothermal conditions. Their structures have been determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses, infrared spectra (IR), UV-vis spectra, powder X-ray diffraction (PXRD), and thermogravimetric (TG) analyses. Compound 1 is composed of two crystallographically independent and distinct polymeric motifs: one-dimensional (1D) S-shaped chain and two-dimensional (2D) undulated layer. The S-shaped chains penetrated into the 2D parallel layers to generate an unusual 1D + 2D → three-dimensional (3D) polypseudo-rotaxane framework. In 2, the As2Mo6 polyoxoanions in tetradentate modes link four neighboring -L2-Cu-L2- chains to produce a rare 3D trinodal (3,4)-connected self-penetrated framework with Point Symbol of (8 3)2(82·124). In 3, adjacent CuI atoms are linked by As2Mo6 polyoxoanions and L3 ligands into a 2D layer. The layers are further interlocked by the two nearest neighboring ones to form a 3D polycatenated framework. In 4, L4 ligands bridge four CuI atoms to yield 2D wavelike layers, which are further linked by the octadentate As2Mo6 polyoxoanions to form a 3D tetranodal (3,4,6)-connected framework with Point Symbol of (6 3)(4·63·82)(64· 82)(42·62·810· 10). In addition, the photocatalytic activities of compounds 1, 3, and 4 for decomposition of methylene blue (MB) under UV light have been investigated. Moreover, their electrochemical properties have also been studied in 1 M H 2SO4 aqueous solution. © 2012 American Chemical Society. Source

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