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关于两投影运动估计中E矩阵的刚性分解性质
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作者 梁学斌 吴立德 《计算机学报》 EI CSCD 北大核心 1995年第8期588-597,共10页
利用2D点对应由两透视投影恢复刚体3D运动和结构的8点线性算法中的本质参数矩阵E可分解为一个反对称矩阵S与另一个旋转阵R的乘积,称此形式的分解为刚性分解.Huang,T.S.和Faugeras,O.D.得出了3×... 利用2D点对应由两透视投影恢复刚体3D运动和结构的8点线性算法中的本质参数矩阵E可分解为一个反对称矩阵S与另一个旋转阵R的乘积,称此形式的分解为刚性分解.Huang,T.S.和Faugeras,O.D.得出了3×3矩阵可作刚性分解的一个充要条件.本文证明了3×3矩阵的刚性分解具有对偶性质,即若E=SR≠0,S=(Sij)3×3,则E有且仅有一个对偶的刚性分解E=(-S)R’,其中和ri’(i=1,2,3)分别表示R和R’的三个列向量,并给出计算3×3矩阵的两个对偶刚性分解的简单公式;得到了N×N(N≥2)矩阵可作刚性分解的充要条件,并证明矩阵刚性分解的对偶性是N=2或3时的特有性质.最后,给出本文结果在运动分析中的应用. 展开更多
关键词 机器视觉 运动估计 矩阵 刚性分解
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一类并行组合多速率(PCM)方法的阶条件和耦合条件分析
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作者 贾志东 《系统仿真学报》 CAS CSCD 2003年第7期953-955,共3页
对分解的常微刚性大系统,我们考虑对刚性子系统采用稳定性较好的并行扩展Rosenbrock方法,对非刚性子系统采用一般的并行RK方法,进行多速率实施。本文利用P_级数理论给出方法的阶条件,并对阶条件中出现的耦合条件做了简要的分析。
关键词 分解的常微刚性大系统 并行组合多速率方法 P-级数 阶条件 耦合条件
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Solving Nonlinear Differential Equation Governing on the Rigid Beams on Viscoelastic Foundation by AGM 被引量:1
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作者 M. R. Akbari D. D. Ganji +1 位作者 A. K. Rostami M. Nimafar 《Journal of Marine Science and Application》 CSCD 2015年第1期30-38,共9页
In the present paper a vibrational differential equation governing on a rigid beam on viscoelastic foundation has been investigated. The nonlinear differential equation governing on this vibrating system is solved by ... In the present paper a vibrational differential equation governing on a rigid beam on viscoelastic foundation has been investigated. The nonlinear differential equation governing on this vibrating system is solved by a simple and innovative approach, which has been called Akbari-Ganji's method (AGM). AGM is a very suitable computational process and is usable for solving various nonlinear differential equations. Moreover, using AGM which solving a set of algebraic equations, complicated nonlinear equations can easily be solved without any mathematical operations. Also, the damping ratio and energy lost per cycle for three cycles have been investigated. Furthermore, comparisons have been made between the obtained results by numerical method (Runk45) and AGM. Results showed the high accuracy of AGM. The results also showed that by increasing the amount of initial amplitude of vibration (A), the value of damping ratio will be increased, and the energy lost per cycle decreases by increasing the number of cycle. It is concluded that AGM is a reliable and precise approach for solving differential equations. On the other hand, it is better to say that AGM is able to solve linear and nonlinear differential equations directly in most of the situations. This means that the final solution can be obtained without any dimensionless procedure Therefore, AGM can be considered as a significant progress in nonlinear sciences. 展开更多
关键词 nonlinear differential equation Akbari-Ganji's method(AGM) rigid beam viscoelastic foundation vibrating system damping ratio energy lost per cycle
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The effect of volatile components in oil on evolutionary character- istics of diamondoids during oil thermal pyrolysis
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作者 FANG ChenChen XIONG YongQiang +3 位作者 LI Yun LIANG QianYong WANG TongShan LI YongXin 《Science China Earth Sciences》 SCIE EI CAS CSCD 2016年第2期362-370,共9页
On the basis of the results of simulation experiments, now we better understand the contribution of high carbon number hydrocarbons to diamondoid generation during thermal pyrolysis of crude oil and its sub-fractions(... On the basis of the results of simulation experiments, now we better understand the contribution of high carbon number hydrocarbons to diamondoid generation during thermal pyrolysis of crude oil and its sub-fractions(saturated, aromatic, resin, and asphalene fractions). However, little is known about the effect of volatile components in oil on diamondoid generation and diamondoid indices due to the lack of attention to these components in experiments. In this study, the effect of volatile components in oil on diamondoid generation and maturity indices was investigated by the pyrolysis simulation experiments on a normal crude oil from the HD23 well of the Tarim Basin and its residual oil after artificial volatilization, combined with quantitative analysis of diamondoids. The results indicate that the volatile components(≤n C12) in oil have an obvious contribution to the generation of adamantanes, which occurs mainly in the early stage of oil cracking(Easy Ro<1.0%), and influences the variations in maturity indices of adamantanes; but they have no obvious effect on the generation and maturity indices of diamantanes. Therefore, some secondary alterations e.g., migration, gas washing, and biodegradation, which may result in the loss of light hydrocarbons in oil under actual geological conditions, could affect the identification of adamantanes generated during the late-stage cracking of crude oil, and further influence the practical application of adamantane indices. 展开更多
关键词 Crude oil Volatile component Thermal pyrolysis DIAMONDOIDS Evolution characteristics
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