The photocatalytic decomposition of acetaldehyde in air at initial concentrations ranging from 3 to 200 mg m −3 has been studied in a semitransparent closed box with an inlet volume of 0.056 m 3 . The photocatalytic r...
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Light adaptive algorithms/architectures are proposed for regularization vision chips. The adaptation mechanisms allow the regularization parameters to change in an adaptive manner in accordance with the light intensit...
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We numerically study the time evolution of coherent vortices in decaying turbulence described by the Charney-Hasegawa-Mima equation with the weak dissipation. Self-organized coherent vortices develop through the mutua...
We numerically study the time evolution of coherent vortices in decaying turbulence described by the Charney-Hasegawa-Mima equation with the weak dissipation. Self-organized coherent vortices develop through the mutual advection and the vortex merging. The dimensional analysis provides the dynamical scaling law of structure function of the potential vorticity field S(k,t)=E5/4λ1/2t1/2G(k/k¯(t)) [k¯(t)∼E−1/8λ3/4t−1/4] with a scaling function G(x), which turns out to be in good agreement with numerical experiments. In physical space, quantities related to coherent vortices develop algebraically with time. The dimensional analysis predicts that the total number N of vortices decreases as N∼t−χ with exponent χ=1/2. Moreover, it is found that the remarkable feature of this system is the approximate conservation of the area of the coherent region in the potential vorticity field.
This paper deals with an adaptive resolved motion rate control (RMRC) method for a cooperative manipulation of a floating object by two free-based space robots with manipulators. Discussions as for the adaptive estima...
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This paper deals with an adaptive resolved motion rate control (RMRC) method for a cooperative manipulation of a floating object by two free-based space robots with manipulators. Discussions as for the adaptive estimation are done on the divided generalized Jacobi matrices, which can be derived by system partition of the whole robot system. The method proposed here has an advantage that control algorithm of each robot is same even if a number of robots increases. The validity of the method was successfully confirmed by computer simulation.
Proposes an efficient and convenient approach to frequency domain subspace identification for continuous-time systems. In the case of continuous-time models, the data matrices often become ill-conditioned if we simply...
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Proposes an efficient and convenient approach to frequency domain subspace identification for continuous-time systems. In the case of continuous-time models, the data matrices often become ill-conditioned if we simply rewrite the Laplace operator s as s=jw, where w denotes the frequency. To avoid the ill-conditioned problem, the operator w=(s-/spl alpha/)/(s+/spl alpha/) is introduced such that the system can be identified based on a state-space model in the w-operator. Then the estimated w-operator state-space model can be transformed back to the common continuous-time state-space model. An instrumental variable matrix in the frequency domain is also proposed to obtain consistent estimates in the presence of measurement noise.
Proposes a robust nonlinear controller for the position tracking problem of a magnetic levitation system, which is governed by a SISO second-order nonlinear differential equation. The controller is designed in a backs...
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Proposes a robust nonlinear controller for the position tracking problem of a magnetic levitation system, which is governed by a SISO second-order nonlinear differential equation. The controller is designed in a backstepping manner, based on the nonlinear system model in the presence of parameter uncertainties. The effects of the parameter uncertainties are reduced by a nonlinear damping term and the effects of position error are removed by a PI controller. Input-to-state stability of the control system is analyzed and experimental results are included to show the excellent position tracking performance of the designed control system.
Molecular packing in helical ribbons of tilted chiral lipid bilayers is investigated as cholesteric liquid crystals. Two types of helices with high- and low-pitch angles observed in the pathway for cholesterol crystal...
Molecular packing in helical ribbons of tilted chiral lipid bilayers is investigated as cholesteric liquid crystals. Two types of helices with high- and low-pitch angles observed in the pathway for cholesterol crystallization (ChC) in native and model biles by Chung et al. [Proc. Natl. Acad. Sci. U.S.A. 90, 11 341 (1993)] correspond to parallel and antiparallel packing of molecules at the edges of the ribbon, respectively. The structural change in the ChC is explained as a decreasing succession of free energy of the metastable intermediate structures.
As a attempt towards brain-computing, adaptive-intelligent controls by neural-network and genetic-algorithm systems are studied. As an application the computer-simulation system for nano-structured materials is constr...
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As a attempt towards brain-computing, adaptive-intelligent controls by neural-network and genetic-algorithm systems are studied. As an application the computer-simulation system for nano-structured materials is constructed.
The purpose of this study is to develop the basic theories and techniques for a plant inspection and diagnosis robot (IDR). The robot dealt with in this study will work in a large scale unmanned plant or a place with ...
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The purpose of this study is to develop the basic theories and techniques for a plant inspection and diagnosis robot (IDR). The robot dealt with in this study will work in a large scale unmanned plant or a place with dangerous environment. It has the ability to monitor the condition of plant machinery with only few sensors, and quickly to discriminate machine failures, in order to guarantee both the quality and quantity of production against accident. The paper proposes a method for detecting a faulty part of a plant machine by the robot. A manipulator installed on the IDR is controlled by genetic algorithms (GA). A microphone installed on the manipulator tip is used to detect a failure signal. It is navigated to the nearby front of the faulty part by sound information and GA control. The method has been proved by practical applications.
This paper describes the method of shape recovery of specular objects illuminated by multiple light sources by pattern recognition. In this method, a three-dimensional shape is recovered from an epipolar plane image (...
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