In this paper, the mechanical construction, thermal regulator design and temperature measurement system of a local area were set up for large-scale linear measurement. Numerical analysis based on temperature correlate...
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In this paper, the mechanical construction, thermal regulator design and temperature measurement system of a local area were set up for large-scale linear measurement. Numerical analysis based on temperature correlated characteristic is discussed to obtain optimal observation points for the measurements. The horizontal temperature distribution of the measured area is compared with the measurement of the variation of temperature at 15℃ and 20℃ over time, and characteristic of dynamic response is also discussed. In addition, the long-time stability of measured temperature is analyzed by means of using the standard deviation. It characterizes the temperature distribution performance of a large area and how it may impact the measurement of a large-scale object.
Fermentation process possesses high non-linear and time difference, and its inherent mechanism is very complex. To carry out further optimizing and control strategy, reasonable model must be gained. There are many cri...
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Fermentation process possesses high non-linear and time difference, and its inherent mechanism is very complex. To carry out further optimizing and control strategy, reasonable model must be gained. There are many critical variables, which are hard to gain in fermentation process. It hold back the effective application of optimal and strategy procedure. Least square support vector machine (LS-SVM) is a kind of extension of support vector machine (SVM). The algorithm of LS-SVM has high precision, fast computing. It is more suitable for predicting online. LS-SVM is presented for modeling of penicillin fermentation process. A model is built by LS-SVM with RBF kernel for mycelial and penicillin. The research result indicates that LS-SVM is an effective method for penicillin ferment process modeling.
annular beam tri-heterodyne confocal microscope has been proposed to improve the anti-environmental interference capability and the resolution of a eonfoeal microscope. It simultaneously detects far-, on-, and near-fo...
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annular beam tri-heterodyne confocal microscope has been proposed to improve the anti-environmental interference capability and the resolution of a eonfoeal microscope. It simultaneously detects far-, on-, and near-focus signals with given phase differences by dividing the measured light path of the eonfoeal microscope into three sub-paths （signals）. Pair-wise real-time heterodyne subtraction of the three signals is used to improve the anti-environmental interference capability, axial resolution, and linearity; and a shaped annular beam super-resolution technique is used to improve lateral resolution. Theoretical analyses and preliminary experiments indicate that an axial resolution of about 1 nm can be achieved with a shaped annular beam tri-heterodyne confoeal microscope and its lateral resolution can be better than 0.2 um for A = 632.8 nm, the numerical aperture of the lens of the microscope is NA = 0.85, and the normalized radius e = 0.5.
A new method is presented to solve the mode mixing problem, which caused by intermittency signal of sifting process of Empirical mode decomposition (EMD). For achieving exact location of intermittency signal, the time...
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ISBN:
(纸本)0980326702
A new method is presented to solve the mode mixing problem, which caused by intermittency signal of sifting process of Empirical mode decomposition (EMD). For achieving exact location of intermittency signal, the time scale difference between intermittency signal and normal background signal, as well as instantaneous frequency characteristic of intrinsic mode function (IMF) are both used in this method. Depending on the located intermittency signal segment, by boundary extending, redo EMD to separate intermittency signal, accordingly removing the influence of intermittency signal in the following EMD. Compare the results of removing intermittency signal using this method with using wavelet method, results indicate that, using this method, the signal distortion is less than wavelet method. And intermittency signal can be decomposed into one FMF.
To resolve the problem of the missile detection in the space early-warning process, an efficient method based on nonlinear adaptive filtering is proposed to detect the small IR target of low SNR under the complex back...
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Spectral irradiance is an important parameter in the fields of aerospace, aviation, national defense and military. Its advance in emissivity measurement has been reviewed during recent years. The apparatus for measuri...
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Spectral irradiance is an important parameter in the fields of aerospace, aviation, national defense and military. Its advance in emissivity measurement has been reviewed during recent years. The apparatus for measuring infrared target simulator was constructed in author's lab by using standard IR Spectro radiometer. Moreover, some applications of measurement technique were reviewed. In the end, the conclusion was made. There is extensive application in the infrared technology of infrared goal simulator. For ensuring the accuracy and availability of transmitting value on measuring infrared radiation, it is necessary to measure and verify the output of the radiation illumination of infrared goal simulator. The principle of method and each part of the measuring device are described, and the method of signal processing is analyzed in this paper.
A molecular dynamics model of nanoelectromechanical (NEM) switch is established and the dynamic characteristic of this model is investigated. The air damping effect on nanostructure is studied and auto-oscillation of ...
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A molecular dynamics model of nanoelectromechanical (NEM) switch is established and the dynamic characteristic of this model is investigated. The air damping effect on nanostructure is studied and auto-oscillation of an atom is simulated when carbon nanotube (CNT) is in balanced state. For obtaining the natural frequency of CNT by means of exerting external force on the end of CNT, the curve of amplitude-frequency response is given too. Finally, the amplitude is analyzed when CNT has resonance vibration in low vacuum. The simulation results show the natural vibration frequency of atom is 2 THz and the natural frequency of CNT is 4.79 GHz. The results also show that the frequency of CNT decreases with the applied force increase at first, but then increases with the force increase, until the switch is closed. Finally, the experiment indicates that if the variation range of pressure is in the same, the amplitude variation under low pressure is higher than that under high pressure.
In this research, we propose and develop a remote medical-care support system for supporting nurses, care managers and care helpers during their work. The proposed system has two functions: a multi-point communication...
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Vector controltechnology is regard as a kind of controlling manner of AC asynchronous motor, and it is already become the first method of the high-performance variable-frequency speed regulating system. Compared with...
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ISBN:
(纸本)142440813X
Vector controltechnology is regard as a kind of controlling manner of AC asynchronous motor, and it is already become the first method of the high-performance variable-frequency speed regulating system. Compared with SPWM, SVPWM (Space Vector Pulse Width Modulation) has been used widely because it has better performance. This paper introduced the basic principle of voltage SVPWM and vector control. A full-digital solution with TMS320LF2407 using simplified SVPWM control method is presented. Through the experiment of controlling to a practical motor, the resulted shows that this method is feasible, the controlling system has better dynamic and static performances and controlling effect, it would have a prospect widely used.
Powder technology in China has been rapidly developed with the growing modern processing industries in recent two decades. In this paper, general situation of Powder Preparation technology in China is summarized both ...
Powder technology in China has been rapidly developed with the growing modern processing industries in recent two decades. In this paper, general situation of Powder Preparation technology in China is summarized both in fine grinding of minerals and nano-powder synthesis processes. Some organizations of Powder technology in China are also introduced for global cooperation in the future.
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