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Your search keyword '"Lü, Ling"' showing total 14 results
Start Over Author "Lü, Ling" Publisher iop publishing
14 results on '"Lü, Ling"'

4. Backstepping synchronization of uncertain chaotic systems by a single driving variable

Author

Lü Ling, Zhang Qing-ling, and Guo Zhi-An

Subjects
Variable (computer science), Observer (quantum physics), Control theory, Computer science, Chaotic systems, Stability theory, Backstepping, Synchronization of chaos, General Physics and Astronomy, Synchronization
Abstract

In this paper a parameter observer and a synchronization controller are designed to synchronize unknown chaotic systems with diverse structures. Based on stability theory the structures of the observer and the controller are presented. The unknown Coullet system and Rossler system are taken for examples to demonstrate that the method is effective and feasible. The artificial simulation results show that global synchronization between the unknown Coullet system and the Rossler system can be achieved by a single driving variable with co-operation of the observer and the controller, and all parameters of the Coullet system can be identified at the same time.

Published
2008
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13. Stress and morphology of a nonpolar a -plane GaN layer on r -plane sapphire substrate

Author

Lin Zhi-Yu, Li Jian-Ting, Lü Ling, Hao Yue, Xue Xiao-Yong, Li Pei-Xian, Zhang Jin-Cheng, Liu Zi-Yang, Xu Sheng-Rui, He Qiang, and Ma Jun-Cai

Subjects
Materials science, Condensed matter physics, Atomic force microscopy, business.industry, Scanning electron microscope, General Physics and Astronomy, Surface finish, Vapour deposition, Stress relief, Condensed Matter::Materials Science, symbols.namesake, Optics, Lattice (order), symbols, Sapphire substrate, Raman spectroscopy, business
Abstract

The anisotropic strain of a nonpolar (110) a-plane GaN epilayer on an r-plane (102) sapphire substrate, grown by low-pressure metal-organic vapour deposition is investigated by Raman spectroscopy. The room-temperature Raman scattering spectra of nonpolar a-plane GaN are measured in surface and edge backscattering geometries. The lattice is contracted in both the c- and the m-axis directions, and the stress in the m-axis direction is larger than that in the c-axis direction. On the surface of this sample, a number of cracks appear only along the m-axis, which is confirmed by the scanning electron micrograph. Atomic force microscopy images reveal a significant decrease in the root-mean-square roughness and the density of submicron pits after the stress relief.

Published
2011
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14. Synchronization of chaotic systems with different orders.

Author

Lü Ling, Luan Ling, and Guo Zhi

Subjects
*CHAOS theory, *LYAPUNOV functions, *ERROR analysis in mathematics, *SYNCHRONIZATION
Abstract

A controller is designed to realize the synchronization between chaotic systems with different orders. The structure of the controller, the error equations and the Lyapunov functions are determined based on stability theory. Hyperchaotic Chen system and Rossler system are taken for example to demonstrate the method to be effective and feasible. Simulation results show that all the state variables of Rossler system can be synchronized with those of hyperchaotic Chen system by using only one controller, and the error signals approach zero smoothly and quickly. [ABSTRACT FROM AUTHOR]

Published
2007
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