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浏览/检索结果: 共5条,第1-5条 帮助

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A new cost estimate methodology for onshore pipeline transport of CO2 in China 会议论文  OAI收割
Kyoto, JAPAN, NOV 18-22, 2012
作者:  
Bai, Bing;  Li, Xiaochun;  Yuan, Yuping
  |  收藏  |  浏览/下载:14/0  |  提交时间:2018/06/05
Exploitation of Fenton and Fenton-like reagents as alternative conditioners for alum sludge conditioning 期刊论文  OAI收割
JOURNAL OF ENVIRONMENTAL SCIENCES, 2009, 卷号: 21, 期号: 1, 页码: 101
作者:  
Tony Maha A;  Zhao Y Q;  Tayeb Aghareed M
  |  收藏  |  浏览/下载:16/0  |  提交时间:2021/03/16
Exploitation of Fenton and Fenton-like reagents as alternative conditioners for alum sludge conditioning 期刊论文  OAI收割
JOURNAL OF ENVIRONMENTAL SCIENCES, 2009, 卷号: 21, 期号: 1, 页码: 101
作者:  
Tony Maha A;  Zhao Y Q;  Tayeb Aghareed M
  |  收藏  |  浏览/下载:14/0  |  提交时间:2021/03/16
A MLP-PNN neural network for CCD image super-resolution in wavelet packet domain (EI CONFERENCE) 会议论文  OAI收割
2008 International Conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2008, October 12, 2008 - October 14, 2008, Dalian, China
Zhao X.; Fu D.; Zhai L.
收藏  |  浏览/下载:68/0  |  提交时间:2013/03/25
Image super-resolution methods process an input image sequence of a scene to obtain a still image with increased resolution. Classical approaches to this problem involve complex iterative minimization procedures  typically with high computational costs. In this paper is proposed a novel algorithm for super-resolution that enables a substantial decrease in computer load. First  decompose and reconstruct the image by wavelet packet. Before constructing the image  use neural network in place of other rebuilding method to reconstruct the coefficients in the wavelet packet domain. Second  probabilistic neural network architecture is used to perform a scattered-point interpolation of the image sequence data in the wavelet packet domain. The network kernel function is optimally determined for this problem by a MLP-PNN (Multi Layer Perceptron - Probabilistic Neural Network) trained on synthetic data. Network parameters dependent on the sequence noise level. This super-sampled image is spatially Altered to correct finite pixel size effects  to yield the final high-resolution estimate. This method can decrease the calculation cost and get perfect PSNR. Results are presented  showing the quality of the proposed method. 2008 IEEE.  
Application of CMOS APS star tracker with large FOV in attitude and angular velocity determination (EI CONFERENCE) 会议论文  OAI收割
Advanced Sensor Systems and Applications III, November 12, 2007 - November 14, 2007, Beijing, China
Lu D.; Guang J.; Shaoju W.; Tao C.
收藏  |  浏览/下载:29/0  |  提交时间:2013/03/25
The paper deals with the spacecraft attitude determination problem using a new kind of star tracker with large FOV based on CMOS APS. Star tracker has been developed since 1970s and proved to be the most accurate sensor ever used in the spacecraft attitude determination systems. But the traditional CCD star tracker also has some disadvantages  such as small FOV  high power consumption  low sample rate and low working angular rate limit which prevent the use of CCD star tracker in attitude large angle maneuvering process. The new kind of star tracker based on CMOS APS has no such disadvantages and is more applicable on modern low-cost agile small satellites. Its higher sample rate and working angular rate limit over traditional CCD star tracker make it more adapt for spacecraft angular velocity determination. Because of the large FOV of the star tracker  the mathematical model of traditional CCD star tracker with a small FOV is not appropriate. So a new mathematical model was quoted to fit the star tracker with a large FOV. An alternative adaptive algorithm was also introduced in the paper. It can help the EKF algorithm work lacking of accurate covariance of the observation noise. An optimal estimation algorithm was used to estimate the angular velocity directly from the star tracker measurements. Mathematic simulation results indicate the CMOS APS star tracker can give accurate attitude information and estimated angular rate. The method can be used as the chief attitude determination system design of low-cost satellite without gyros  or be used as a backup strategy in the event of gyro failures to enhance the reliability of the attitude determination system.