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Chen系统的状态变量周期性反馈控制

李开明 , 李亚洲 , 冯维贵 , 林长

量子电子学报 doi:10.3969/j.issn.1007-5461.2007.05.014

采用非线性反馈控制,用附加了带参数的正弦项对Chen系统进行了有效的控制.随着参数k的逐渐增大,系统的动力学行为呈现出一系列的变化.数值研究结果表明:随控制参数的增大,驱动信号的强度渐大,混沌系统由混沌运动到周期轨道,最终到一相点.

关键词: 混沌 , Chen系统 , 不动点 , Lyapunov指数 , 反馈控制

第27卷B辑作者索引

金属学报

Volu扣ne 27SeriesB1991AUTHOR INDEX CCAO Guanghan(曹光旱)············……6一B科6CAo weijie(曹卫恋)..················……5一

关键词:

Ion sputter erosion in metallic glass-A response to "Comment on: Homogeneity of Zr(64.13)Cu(15.75)Ni(10.12)Al(10) bulk metallic glass" by L-Y. Chen, Y-W. Zeng, Q-P. Cao, B-J. Park, Y-M. Chen, K. Hono, U. Vainio, Z-L. Zhang, U. Kaiser, X-D. Wang, and J-Z Jiang J. Mater. Res. 24, 3116 (2009)

Journal of Materials Research

The morphology of the dark and bright regions observed by transmission electron microscopy for the Zr(64.13)Cu(15.75)Ni(10.12)Al(10) bulk metallic glass strongly depends on the ion beam parameters used for ion milling. This indicates that the ion beam could introduce surface fluctuation to metallic ...

关键词: room-temperature

(a-AB-b+b-C-b)型线型缩聚体系的分子量分布

闫福安

高分子材料科学与工程

用统计理论得到了(a-AB-b+b-C-b)型线型缩聚体系的分子量分布函数;而且双官能度单体可以控制均缩聚的平均聚合度,所得聚合物的分子量分布远比Flory分布窄.

关键词: (a-AB-b+b-C-b)型线型缩聚 , 分子量分布 , 统计理论

Phase relation in the system Sm-Co-B

Journal of Alloys and Compounds

The isothermal section at 700 degrees C in the Co-rich ternary Sm-Co-B system was determined by means of X-ray diffraction. In this range, nine ternary borides were observed: Sm3Co13B2, SmCo4B, Sm3Co11

关键词: Sm-Co-B;phase diagram;magnetic-properties

Phase relation in the system Gd-Co-B

Journal of Alloys and Compounds

The isothermal section at 700 degrees C in the Go-rich ternary Gd-Co-B system was determined by means of x-ray diffraction. In this range, nine ternary borides were observed: Gd3Co13B2, GdCo4B, Gd3Co11

关键词: Gd-Co-B;phase diagram;earth

Dependence of Ni, Al and B boundary concentrations on the B bulk concentration for the Ni3Al-x at.% B grain boundary

Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms

We have applied the embedded atom method (EAM). to calculate boundary concentration distributions of Ni, Al and B, and B probabilities in the "interstitial" and, the "substitutional" sites, at the Ni3Al-x at.% B

关键词: computer-simulation;boron;segregation;fracture;metals;alloys

Decomposition of B4C and magnetic properties of Nd-Fe-(B,C) alloys synthesized by mechanical alloying

Journal of Alloys and Compounds

Nd-Fe-(B.C) alloys have been synthesized by mechanical alloying and subsequent heat-treatment, with B4C as one of the starting materials. It is found that when the pure B4C is milled alone, it proves difficu...

关键词: permanent magnets;mechanical alloying;fe-c alloys;permanent-magnets;r2fe14c;nd

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