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Zhang G.-Y.,Beijing Institute of Technology | Yang L.,Beijing Institute of Technology | Zhou Z.-N.,Beijing Institute of Technology | Zhang T.-L.,Beijing Institute of Technology | And 2 more authors.
Hanneng Cailiao/Chinese Journal of Energetic Materials | Year: 2012

A SETARAM C80 calorimeter was used in the experiment to measure the enthalpy of dissolution and thermodynamic properties of trinitrophloroglucinol (TNPG) dissolved in deionized water (H 2O) at 298.15 K. The empirical formula for the enthalpy of dissolution was calculated by polynomial expressions. The fomula is: Δ dissH m= 106.799266-2352.19194b 1/2+15538.58581b. The standard molar enthalpy of dissolution, the relative apparent molar dissolution enthalpy and the relative partial molar enthalpy also were obtained from the experimental data of the enthalpy of dissolution of TNPG in water. The kinetic formula was obtained. From the formula the rate constant and reaction order are deduced. Source


Zu X.,Nanjing University of Science and Technology | Huang Z.,Nanjing University of Science and Technology | Zhang L.,Shandong Machinery Group Co. | Zhu C.,Nanjing University of Science and Technology
Advanced Materials Research | Year: 2011

Steel is the most used material for the confinement plates of composite armors, but other materials may afford better protection against shaped charges. One of the most interesting materials is ceramic because of its hardness, of its relatively small density and of the reduction of collateral damages, and the other one of the most interesting materials is aluminum because of its small density and ductility. We have therefore compared the protection capability of rubber composite armors built either with copper or with steel. For each configuration, we measured the loss energy of the standard charge shaped jet and the change of the tangential velocity of the different layers with simulation measure and point the deformation of the jet when they penetrated the composite armors. We also have done some X-ray experiments to observe the deformation of the jet to test and verify the result of the simulation. Clear correlations are observed between the projection capability and the confinement materials. © (2011) Trans Tech Publications, Switzerland. Source


He Z.-W.,Nanjing University of Science and Technology | Liu Z.-L.,Nanjing University of Science and Technology | Wang A.-L.,Shandong Machinery Group Co.
Huozhayao Xuebao/Chinese Journal of Explosives and Propellants | Year: 2010

In order to know the desensitizing efficiency of 2,6-diamino-3,5- dinitropyridine-1-oxide(ANPyO) on hexogen (RDX), ANPyO/RDX composites were prepared by crystal coating and mixing method respectively. The structures and properties of the two samples were characterized by SEM, laser particle size analysis, TG, DSC, mechanical sensitivity and detonation velocity tests. Results show that ANPyO has a better coating on RDX crystal coating than mixing method ; the average particle sizes of the samples are situated between ANPyO and RDX, and the particle size distribution of sample in crystal coating is more uniform; the decomposition peak temperatures of the samples are lower than that of RDX, the thermal decomposition peak temperatures are higher 6-15°C crystal coating than mixing method;in comparison with RDX and the sample obtained by mixing method the mechanical sensitivity of the samples are lower than that of RDX, and the mechanical sensitivity of the sample in crystal coating decreased more significant. Source


Li M.,Beijing University of Technology | Ting W.,Shandong Machinery Group Co.
ICCET 2010 - 2010 International Conference on Computer Engineering and Technology, Proceedings | Year: 2010

As a remedy for pseudo-Gibbs phenomenon commonly existing in contourlet transform image denoising, a perfectly translation-invariant image denoising technique based on nonsubsampled complex contourlet transform (NCCT) is put forward in this paper. First, it use the dual-tree complex wavelet transform (DT-CWT) for multi-scale decomposition. Second, we apply nonsubsampled directional filter banks (NSDFB) to the DT-CWT coefficients, in such a way to maintain the anisotropy scaling law. The experiment results showed that this algorithm can get higher PSNR and the better visual. © 2010 IEEE. Source


Li M.,Beijing University of Technology | Wang T.,Shandong Machinery Group Co. | Wang C.-B.,Beijing University of Technology | Fu Z.-Q.,Beijing University of Technology | Li W.-Q.,Beijing University of Technology
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2010

A novel denoising method based on the nonsubsampled wavelet-based contourlet transform (N-WBCT) was proposed in this paper. It employs wavelet transform for multi-scale decomposition, and nonsubsampled directional filter banks (NSDFB) for directional decomposition. N-WBCT has not only the properties of multi-resolution and multi-direction, but also the property of translation invariance, which is useful in eliminating the Gibbs phenomenon. The experiment results showed that this algorithm can get higher PSNR and the better visual. © 2010 Copyright SPIE - The International Society for Optical Engineering. Source

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