For nonlinear differential-algebraic equations subsystems satisfying linear growth conditions, the problem of output feedback stabilization control is considered in this paper. The design of the state observer and tha...
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For nonlinear differential-algebraic equations subsystems satisfying linear growth conditions, the problem of output feedback stabilization control is considered in this paper. The design of the state observer and that of the controller are coupled. The proposed observer is non-initialized and linear which robustify the observer. Based on Backstepping approach, a linear dynamic output compensator is constructed, through which the whole closed-loop systems are asymptotically stable. The simulation results demonstrate the effectiveness of the proposed control scheme.
Infrared images are firstly analyzed using the multifractal theory so that the singularity of each pixel can be extracted from the images. The multifractal spectrum is then estimated, which can reflect overall charact...
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Infrared images are firstly analyzed using the multifractal theory so that the singularity of each pixel can be extracted from the images. The multifractal spectrum is then estimated, which can reflect overall characteristic of an infrared image. Thus the edge and texture of an infrared image can be accurately extracted based on the singularity of each pixel and the multifractal spectrum. Finally the edge pixels are classified and enhanced in accordance with the sensitivity of human visual system to the edge profile of an infrared image. The experimental results obtained by this approach are compared with those obtained by other methods. It is found that the proposed approach can be used to highlight the edge area of an infrared image to make an infrared image more suitable for observation by human eyes.
Evolutionary games are widely studied in the fields of biology, sociology, economics and informatics. People's interests focus on how cooperation emerged in a system that individuals are selfish. We studied the it...
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Evolutionary games are widely studied in the fields of biology, sociology, economics and informatics. People's interests focus on how cooperation emerged in a system that individuals are selfish. We studied the iterated Prisoner's Dilemma Game evolved on BA network with genetic algorithm. Nodes in network could remember the game historical strategies and coded into gene. We show that memory length has gentle effect on cooperation level, and that some characteristic genes and frequently used genes emerge after some generations. We also find that cooperate strategy distributed on different degree-nodes equably. These findings give new perspectives to the illustration of cooperation behavior in biological group and society.
A technical review is presented of the development of a special type of planar loudspeaker array for wave field synthesis, known as multiactuator panel. It consists of a thin, stiff panel with a small back volume, whi...
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A technical review is presented of the development of a special type of planar loudspeaker array for wave field synthesis, known as multiactuator panel. It consists of a thin, stiff panel with a small back volume, which vibrates by means of a group of mechanical exciters, each driven by a different signal. Multiactuator panels are used as alternatives to arrays of classic loudspeakers with conically shaped diaphragms for wave field synthesis, with added benefits such as low visual profile and diffuse radiation. However, the use of multiactuator panel arrays poses some problems and technical challenges that have been described in the literature. A historical review of the evolution from single-to multi-excited panels is given, followed by a technical discussion of the current developments in the field of wave field synthesis reproduction by means of multiactuator panels.
Aiming at detecting Cl2 gas, this study was made on how to make In-based compound semiconductor oxide gas sensor. The micro-property and sensitivity of In-based gas sensing material were analyzed and its gas sensitive...
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Aiming at detecting Cl2 gas, this study was made on how to make In-based compound semiconductor oxide gas sensor. The micro-property and sensitivity of In-based gas sensing material were analyzed and its gas sensitive mechanism was also discussed. Adopting constant temperature chemical coprecipitation, the compound oxides such as In-Nb, In-Cd and In-Mg were synthesized, respectively. The products were sintered at 600 ℃ and characterized by the Scanning Electron Microscope （SEM）, showing the grain size almost about 50-60 nm. The test results show that the sensitivities of In-Nb, In-Cd and In-Mg materials under the concentration of 50 × 10^-6 in Cl2 gas are above 100 times, 4 times and 10 times, respectively. The response time of In-Nb, In-Cd and In-Mg materials is about 30, 60 and 30 s, and the recovery time less than 2, 10 and 2 min, respectively. Among them, the In-Nb material was found to have a relatively high conductivity and ideal sensitivity to Cl2 gas, which showed rather good selectivity and stability, and could detect the minimum concentration of 0.5 × 10^-6 with the sensitivity of 2.2, and the upper limit concentration of 500 × 10^-6. The power loss of the device is around 220 mW under the heating voltage of 3 V.
An image restoration method based on least-squares and regularization and fourth-order partial differential equations is proposed in this study. Noise is removed by improved Yu-Li and M. Kaveh's fourth-order parti...
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The light intensity distribution inside organic solar cells is described by optical propagation matrix and the quantity of effective excitons is defined in this paper. The quantity of effective excitons describes the ...
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ISBN:
(纸本)9781424457977
The light intensity distribution inside organic solar cells is described by optical propagation matrix and the quantity of effective excitons is defined in this paper. The quantity of effective excitons describes the total intensity near the donor/acceptor interface, which can contribute to the generation of holes and electrons. The optimum structure then can be obtained by maximizing this parameter. In this paper, CuPc/Qo structure is taken as an example. It is found the optimum structure is CuPc(15nm)/C6o (4Onm). The verification experiments are established and only 5nm error appears in the thickness of CuPc.
Fluorescence analysis applied in the study of lactic acid bacteria （LAB） provides a new method and theory to study probiotics and realize the detection and identification of the strains. It is also possible to achie...
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Fluorescence analysis applied in the study of lactic acid bacteria （LAB） provides a new method and theory to study probiotics and realize the detection and identification of the strains. It is also possible to achieve automation and computerization. In this letter, the differences between the fluorescence spectra of lactobacilIus casei-BDI （Lc-BDI） and Streptococcus thermophilus （St） are shown, and the second-order derivative spectra are used to further study the diversity of these two strains. According to the results, with the excitation wavelengths of 285 and 340 nm, there are significant differences between them. The experiment is repeated for 6 times, showing good repetitiveness.
Due to the difficulty in synthesizing perhalogenated metallophthalocyanine, the method of ammonium molybdate solid phase catalysis was introduced, and by using tetrachlorophthalic anhydride and urea as the raw materia...
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Due to the difficulty in synthesizing perhalogenated metallophthalocyanine, the method of ammonium molybdate solid phase catalysis was introduced, and by using tetrachlorophthalic anhydride and urea as the raw materials, hexadecachloro zinc phthalocyanine （ZnPcCl16） was synthesized. Components of the composite were analyzed by energy spectrum, and its functional group structures and absorption peaks were characterized by IR and UV-vis spectroscopy. The thin films of gas sensors were prepared in a vacuum evaporation system and evaporated onto SiO2 substrates, where sensing electrodes were made by MEMS micromachining. The optimal conditions for the films are： substrate temperature of 150 ℃ evaporation current of 95 A and film thickness of 50 nm. The result showed that the sensors were ideally sensitive to Cl2 gas and could detect the minimum concentration of 0.3 ppm.
To solve the fault diagnosis problem of liquid propellant rocket engine ground testing bed,a fault diagnosis approach based on self-organizing map(SOM)is *** SOM projects the multidimensional ground testing bed data i...
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To solve the fault diagnosis problem of liquid propellant rocket engine ground testing bed,a fault diagnosis approach based on self-organizing map(SOM)is *** SOM projects the multidimensional ground testing bed data into a two-dimensional *** of the SOM is used to cluster the ground testing bed *** out map of the SOM is divided to several *** region is represented for one fault *** fault mode of testing data is determined according to the region of their labels belonged *** method is evaluated using the testing data of a liquid-propellant rocket engine ground testing bed with sixteen fault *** results show that it is a reliable and effective method for fault diagnosis with good visualization property.
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