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Dadukou, China

A novel metal-organic frameworks, [compound 1, Zn(ATZ)2, ATZ = 5-aminotetrazole], has been synthesized by the solvothermal reaction of zinc nitrate and 5-aminotetrazole. Compound 1 displays a unique three-dimensional four-connected dia topological network. Source

A novel three-dimensional (3D) Cd(II) metal-organic frameworks [Cd 3(2,6-ntd)3(DMA)4] (1; 2,6-ntd = 2,6-naphthalene dicarboxylic acid; DMA = N,N'-dimethyl acetamide) has been solvothermally synthesized. Single-crystal structure analysis reveals that this compound crystallized in a monoclinic space group of C2/c with a = 14.4124(4) Å, b = 18.5328(4) Å, c = 21.3181(5) Å, α = 90.00°, β = 98.811(2)°, λ = 90.00°, V = 5626.9(2) Å3 and Z = 4. From the viewpoint of topology, it can be reduced to a 6-connected PCU topological network. Source

Rui T.,Panzhihua University | Qi Z.,University of Sichuan
Procedia Engineering

In order to solve the uncertainties in the position servo system, caused by servo system without modeling accurately, which may cause the deterioration of the control quality of the electro-hydraulic position servo system (EHPSS) and even lead to its instability, a dynamic sliding mode control strategy is proposed for an EHPSS. Based on dynamic switching function, the proposed control strategy has fast response and good disturbance rejection capability. The numerical simulation is presented to verify the effectiveness of the proposed control scheme. It is shown from the experimental results that the proposed controller offers several advantages such as fast response, good disturbance rejection capability, good position tracking capability and so forth. It is also revealed from simulation results that the proposed control strategy is valid for the EHPSS. © 2011 Published by Elsevier Ltd. Source

This paper considers the stochastic resonance for a time-delayed mono-stable system, driven by correlated multiplicative and additive white noise. It finds that the output signal-to-noise ratio (SNR) varies non-monotonically with the delayed times. The SNR varies non-monotonically with the increase of the intensities of the multiplicative and additive noise, with the increase of the correlation strength between the two noises, as well as with the system parameter. © 2011 Chinese Physical Society and IOP Publishing Ltd. Source

Yan C.,Panzhihua University
Journal of Multimedia

Content-Based Image Retrieval (CBIR) is one of the most active hot spots in the current research field of multimedia retrieval. According to the description and extraction of visual content (feature) of the image, CBIR aims to find images that contain specified content (feature) in the image database. In this paper, several key technologies of CBIR, e. g. the extraction of the color and texture features of the image, as well as the similarity measures are investigated. On the basis of the theoretical research, an image retrieval system based on color and texture features is designed. In this system, the Weighted Color Feature based on HSV space is adopted as a color feature vector, four features of the Co-occurrence Matrix, saying Energy, Entropy, Inertia Quadrature and Correlation, are used to construct texture vectors, and the Euclidean distance for similarity measure is employed as well. Experimental results show that this CBIR system is efficient in image retrieval. © 2013 ACADEMY PUBLISHER. Source

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