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Symmetry Transformation and New Exact Multiple Kink and Singular Kink Solutions for (2+1)-Dimensional Nonlinear Models Generated by the Jaulent-Miodek Hierarchy

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Communications in Theoretical Physics 2013年第2期59卷 141-145页

作者：马红彩秦振云郑爱平 Department of Applied Mathematics College of Science Donghua University Department of Mathematics Fudan University

In this paper, we consider a system of (2+1)-dimensional nonlinear models by using CK direct method and Hereman-Nuseir method generated by the Jaulent-Miodek Hierarchy. We construct some new multiple kink and singular... 详细信息

关键词：非线性模型对称变换奇异直接方法 ir方法符号计算扭结

Pyrolysis Characteristics and Kinetics of Methyl Oleate Based on TG-FTir Method

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China Petroleum Processing & Petrochemical Technology 2015年第2期17卷 17-25页

作者： Wang Xuechun Fang Jianhua Chen Boshui Wang Jiu Wu Jiang Department of Military Oil Application & Administration Engineering Logistical Engineering University

The thermal decomposition characteristics of methyl oleate were preliminarily investigated under nitrogen atmosphere by a thermogravimetric analyzer when the ester was heated at a heating rate of 10 ℃/min from room temperature to 600 ℃. Furthermore, the pyrolytic and kinetic characteristics of methyl oleate were intensively studied at different heating rates. The gaseous species obtained during thermal decomposition were also identified by the TG-FTir coupling analysis. The results showed that the pyrolysis of methyl oleate proceeded in three stages, viz. the drying stage, the main pyrolysis stage and the residual pyrolysis stage. The initial decomposition temperature, the maximum weight loss temperature, the peak decomposition temperature and the rate of maximum weight loss of methyl oleate increased with the increasing heating rates. Gaseous CO, CO2 and H2 O were the typical decomposition products from pyrolysis of methyl oleate. In addition, a kinetic model for thermal decomposition of methyl oleate was built up based on the experimental results using the CoatsRedfern integral method and the multiple-linear regression method. The activation energy, the pre-exponential factor, the reaction order and the kinetic equation for thermal decomposition of methyl oleate were obtained. Comparison of the experimental data with the calculated ones and analysis of statistical errors of pyrolysis ratios demonstrated that the kinetic model was reliable for studying the pyrolysis of methyl oleate. Finally, the kinetic compensation effect between the preexponential factors and the activation energy in the pyrolysis of methyl oleate was also confirmed.

关键词：热解动力学模型油酸甲酯热解特性 ir方法酯基热分解特性多元线性回归方法 TG-FTir

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各向异性对非对称薄膜中的自旋波的影响

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内蒙古大学学报（自然科学版） 2004年第1期35卷 27-33页

作者：王利霞周文平内蒙古大学理工学院物理系呼和浩特010021

采用界面重标度(ir)方法〔1〕,研究了非周期性边界条件下,双层非对称铁磁薄膜中自旋波的本征值问题,并计入体单轴各向异性,讨论了其对非对称铁磁薄膜中自旋波色散关系以及其波形的影响.结果表明:体单轴各向异性对非对称铁磁薄膜中的自... 详细信息

采用界面重标度(ir)方法〔1〕,研究了非周期性边界条件下,双层非对称铁磁薄膜中自旋波的本征值问题,并计入体单轴各向异性,讨论了其对非对称铁磁薄膜中自旋波色散关系以及其波形的影响.结果表明:体单轴各向异性对非对称铁磁薄膜中的自旋波的影响很大,情况也较复杂.具体来说,随着两层薄膜中某一层的体各向异性常数的增加,体模和相应层内的禁闭模均有所变化(包括数目和数值),在整个变化过程中,光学-光学界面模的数目不变,本征模能量随DA(体各向异性)的增加而线性减小,而且,体单轴各向异性对各种自旋波本征模的波形影响也很大.

关键词： ir方法非周期性边界条件体单轴各向异性