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基于李群理论的汽油发动机尾气分析模型匹配算法研究 被引量:1
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作者 吴士力 《交通节能与环保》 2015年第6期37-42,共6页
为了准确对发动机尾气排放状态和规律进行分析,本文提出了一种基于李群理论的汽油发动机尾气分析模型。该模型针对尾气排放量的非线性变化特征,利用李代数和李群之间的指数映射关系建立李群仿射模型,然后在流行拓扑空间上对尾气中主要... 为了准确对发动机尾气排放状态和规律进行分析,本文提出了一种基于李群理论的汽油发动机尾气分析模型。该模型针对尾气排放量的非线性变化特征,利用李代数和李群之间的指数映射关系建立李群仿射模型,然后在流行拓扑空间上对尾气中主要污染物的含量进行建模。通过模型匹配算法实现对尾气排放状态的正常与否进行分析。该方法利用数据的流行拓扑信息,有效提高了非线性建模和匹配的准确性和效率。在福特蒙迪欧牌轿车上的实验结果表明,该模型能够以较高精度对汽油机尾气排放状况进行建模和状态匹配。 展开更多
关键词 李群 汽油机尾气 流行拓扑 仿射
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Epidemic Spread in Networks Induced by Deactivation Mechanism
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作者 YU Xiao-Ling WU Xiao ZHANG Duan-Ming LI Zhi-Hao LIANG Fang WANG Xiao-Yu 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第5期1357-1360,共4页
We have studied the topology and epidemic spreading behaviors on the networks in which deactivation mechanism and long-rang connection are coexisted. By means of numerical simulation, we find that the clustering coeff... We have studied the topology and epidemic spreading behaviors on the networks in which deactivation mechanism and long-rang connection are coexisted. By means of numerical simulation, we find that the clustering coefficient C and the Pearson correlation coefficient r decrease with increasing long-range connection μ and the topological state of the network changes into that of BA model at the end (when μ = 1). For the Susceptible-Infect-Susceptible model of epidemics, the epidemic threshold can reach maximum value at μ = 0.4 and presents two different variable states around μ= 0.4. 展开更多
关键词 epidemic threshold deactivation mechanism long-rang connection
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