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Nanometer-sized neodymium oxide has been synthesized by humid solid state reaction at room temperature, and characterized by scanning electron microscope, laser light scattering and X-ray diffraction. The effects of nanometer -sized neodymium oxide on catalyzing thermal decomposition reaction of hexogen (cyclotrimethylenetriamine, RDX) and absorbent powder (nitrocellulose absorbed nitroglycerin, NC/NG) have been investigated by DSC method. The mechanism of these catalytic reactions has also been proposed. The experimental results show that nanometer-sized neodymium oxide can catalyze the decomposition reaction of RDX and NC/NG effectively. The experimental results further suggest that nanometer-sized neodymium oxide is a potentially useful combustion catalyst of nitroamine propellant. 相似文献
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自相似业务模型—通信网络突发业务建模的新方法 总被引:26,自引:3,他引:23
在研究通信网络的流量控制及网络性能时,业务源模型是一个十分重要的组成部分。传统的业务模型大多基于Poisson模型或其改进形式,假定业务突发长度呈负指数分布。近年来对大量的WAN、LAN、及VBR业务、ISDN中传输的业务等多种业务的测量表明:在这些业务中普遍存在着自相似性(或称为长相关性)。该性质显著影响宽带网的流量控制及排队分析,因而已经受到越来越多的关注。本文综述了近几年在自相似业务模型研究方面所取得的主要成果,包括自相似业务的数学描述、建模方法、排队分析等。 相似文献
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