The preparation of polycrystalline GaAs films by using electrodeposition technology is described in this paper. Using scanning electron microscopy, X-ray diffraction, spectrophotometry and capacitance voltage testing....
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The preparation of polycrystalline GaAs films by using electrodeposition technology is described in this paper. Using scanning electron microscopy, X-ray diffraction, spectrophotometry and capacitance voltage testing. we have measured the characteristics of the films prepared. The results show that the stoichiometry of the film is Ga0.91As1.09. On the basis of a Mott-Schottky plot, the position of the energy band edges of the film is calculated. Finally, the photoelectrochemical characteristic of the Ga0.91As1.09 film/electrolyte junction is measured.
作者：
DUAN, GR[a]P.O. Box 329
Department of Control Engineering Harbin Institute of Technology Harbin 150006 P. R. China
Based on a p-posed complete parametric approach for eigenstructure assignment in multivariable linear systems via dynamical compensators, insightful parametrizations of the closed loop eigenvalues sensitivities to the...
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Based on a p-posed complete parametric approach for eigenstructure assignment in multivariable linear systems via dynamical compensators, insightful parametrizations of the closed loop eigenvalues sensitivities to the perturbed elements in the open loop system matrices are obtained, and an effective algorithm for eigenvalue assignment with minimum sensitivity in multivariable linear systems via dynamical compensators is then proposed. The algorithm does not contain 'going back' procedures, and allows the closed loop eigenvalues to be conveniently optimized within desired regions. A numerical example demonstrates its effect, simplicity and numerical property.
1 Introduction Lithium niobate crystal (LN) has photoelectric effect and nonlinear optic effect, whose properties may be improved by doping impure ions. The study on the Fe: LN crystal was developed early and the holo...
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1 Introduction Lithium niobate crystal (LN) has photoelectric effect and nonlinear optic effect, whose properties may be improved by doping impure ions. The study on the Fe: LN crystal was developed early and the holographic storage, optical amplification and phase conjugation mirror have been carried out, but at present, many problems on the research of Fe: LN crystal are unresolved, for example, the absorption is strong for A_r^+-ion laser beam, the energy loss of light source is large, the scattering of the output light beam is intense, the spatial distribution is not uniform, etc. Therefore, it is necessary to fur-
Ill-conditioned plants with delays are generally difficult to *** by the work of Doyle's[1],this paper deeply investigates the robust control of ill- conditioned plants,and provides some new results.
ISBN:
(纸本)0780312333
Ill-conditioned plants with delays are generally difficult to *** by the work of Doyle's[1],this paper deeply investigates the robust control of ill- conditioned plants,and provides some new results.
This paper concerns the H/sup /spl infin// model-matching problem of discrete-time systems using the conjugation method. The restriction on T/sub 2//sup -1/(z) and T/sub 3//sup -1/(z) which must be antistable is remov...
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ISBN:
(纸本)0780312333
This paper concerns the H/sup /spl infin// model-matching problem of discrete-time systems using the conjugation method. The restriction on T/sub 2//sup -1/(z) and T/sub 3//sup -1/(z) which must be antistable is removed in this paper. The result can be used to solve more general H/sup /spl infin// model-matching problems of discrete-time systems.< >
This paper deals with the mixed-sensitivity problem in the discrete-time case. It is proved if the plant is stable, only one Riccati equation need to be solved. If the plant is unstable, only one full dimension Riccat...
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ISBN:
(纸本)0780312333
This paper deals with the mixed-sensitivity problem in the discrete-time case. It is proved if the plant is stable, only one Riccati equation need to be solved. If the plant is unstable, only one full dimension Riccati equation and a lower dimension Riccati equation need to be solved.< >
Based on a newly proposed eigenstructure assignment result and the matrix eigenvalue sensitivity theory, a simple effective algorithm for robust pole assignment in multivariable linear systems via output feedback is p...
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Based on a newly proposed eigenstructure assignment result and the matrix eigenvalue sensitivity theory, a simple effective algorithm for robust pole assignment in multivariable linear systems via output feedback is presented, which gives a robust solution in the sense that the closed-loop eigenvalues are as insensitive as possible to perturbations in the system coefficient matrices. The algorithm does not contain 'going back' procedures, and may conveniently include closed-loop eigenvalues as optimising parameters, and also possesses good numerical property and better optimality. Computational results show its effect and simplicity.
In this paper, we introduce the structure and function of the inertial component automatic test system first .And then we analyse various methods which are used to dispose the system failure by the experts of the test...
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In this paper, we introduce the structure and function of the inertial component automatic test system first .And then we analyse various methods which are used to dispose the system failure by the experts of the test system in detail . A fault diagnosis system of the inertial component automatic test system is founded by using the theories .techniques and methods of knowledge engineering. The diagnosis system can improve the diagnosis rate by using other kinds of knowledge on the baiss of the hierarchy diagnosis model. The establishment of the protomodel system verifies the feasibility and correctness of the system .
The robust output feedback control of linear systems with cone-bounded nonlinear perturbations is considered. By using the Lyapunov approach, a sufficient robust stability condition for the closed-loop system is obtai...
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The robust output feedback control of linear systems with cone-bounded nonlinear perturbations is considered. By using the Lyapunov approach, a sufficient robust stability condition for the closed-loop system is obtained, which is expressed in terms of closed-loop eigenvalues and eigenvectors. Based on this condition and a parametric eigenstructure assignment result, an algorithm for robust output feedback controller synthesis is presented, which ensures not only the robust stability, but also the robust performance to a certain degree. The approach has the advantage of allowing the nominal closed-loop eigenvalues to be optimized within any desired region, and the closed-loop eigenvalues so determined are naturally insensitive to small parameter perturbations in the open-loop system coefficient matrices.< >
A special least squares (SLS) method is proposed which is based on minimizing the sum of squared relative deviations. The author analyzes the problem of classical least squares (LS) in fitting a static characteristic ...
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A special least squares (SLS) method is proposed which is based on minimizing the sum of squared relative deviations. The author analyzes the problem of classical least squares (LS) in fitting a static characteristic equation and points out the shortcomings of the LS method under some experimental conditions. It is noted that the proposed SLS method could overcome the shortcomings. The formulas of SLS are given and its mathematical characteristics are analyzed. Under the given conditions, this method is unbiased, consistent, and efficient. An example is given of fitting a static characteristic equation of a potentiometer by using the SLS method. The results show that, under the given experimental conditions, the SLS method is superior to the traditional LS method.< >
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