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Quantum Dynamics in Condensed Phase Molecular Systems with Classical and Nonclassical Trajectories 其他
2013-01-01
Jian Liu
收藏  |  浏览/下载：4/0  |  提交时间：2017/12/03
Image compression based on contourlet and no lists SPIHT (EI CONFERENCE) 会议论文
2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010, August 24, 2010 - August 26, 2010, Changchun, China
Zhang S.; Xue X.; Shi J.
收藏  |  浏览/下载：38/0  |  提交时间：2013/03/25
The volume of raw image data captured by the high resolution camera is extremely huge. Thus the efficient image compression method should be used to decrease the bit rate. The image compression method based on wavelet is used more widely nowadays. However  two dimensional wavelet is only the tensor product of the one dimensional wavelet whose support region of basis function is extended from interval to square. Contourlet is an image multiscale geometric analysis tool  which could represent image sparsely and has strong capability of nonlinear approximation. The basis function of contourlet is multidirectional and anisotropic. Nevertheless  contourlet is redundant. So the non-redundant Wavelet Based Contourlet Transform (WBCT) is used in this paper. The SPIHT algorithm is very efficient way to coding the significant coefficients. And the improved no lists SPIHT is more easy to implemented by hardware. Image compression method based on the combination of both wavelet based contourlet transform and no lists SPIHT coding is proposed in the paper. Experiment shows that compared to wavelet based scheme the contourlet scheme can reserve the texture of the image. For barbara test image when coding at low bit rate the PSNR can improve about 0.2dB. 2010 IEEE.  
Design of high precision star image locating method used in star sensor technology (EI CONFERENCE) 会议论文
2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010, August 24, 2010 - August 26, 2010, Changchun, China
Zhang S.; Sun H.; Wang Y.; Jia X.; Chen H.
收藏  |  浏览/下载：50/0  |  提交时间：2013/03/25
Nowadays star sensor technology used in aircraft attitude measurement has become more and more popular for its high precision  light weight  without attitude accumulation errors and other advantages. In order to enhance the accuracy of star sensor  it is critical to make efforts to promote the precision of star image locating. High precision star image locating method mentioned in this article includes two aspects. One is sub-pixel dividing algorithm used to acquire the coordinate of stars. The other one is imaging calibration method used to weaken the effect caused by imaging distortion. This method is finally realized in some type of star sensor system. Then an experiment is designed to verify the precision of the method. The result of the experiment shows that the precision of the method is 2" in the experimental environment. 2010 IEEE.  
Optical design of reflecting telescope with large field (EI CONFERENCE) 会议论文
4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, November 19, 2008 - November 21, 2008, Chengdu, China
Gong D.; Wang H.; Tian T.-Y.; Yuan J.-G.
收藏  |  浏览/下载：20/0  |  提交时间：2013/03/25
从杨粲墓看今黔北地域宋代墓葬石刻艺术 学位论文
: 四川大学, 2008
作者:  曾春蓉
收藏  |  浏览/下载：3/0  |  提交时间：2019/04/19
Yangcan’s  tumulus  the  north  of  Qian  nowadays  Song  dynasty  stone  carvings  in  the  tumuli  
Analysis of a precise instrument for measuring reference level involute (EI CONFERENCE) 会议论文
Third International Symposium on Precision Mechanical Measurements, August 2, 2006 - August 6, 2006, Xinjiang, China
Lou Z.; Wang L.; Wang X.; Ma Y.; Zhang Y.
收藏  |  浏览/下载：17/0  |  提交时间：2013/03/25
Reference level involute is used for evaluating other involutes  but it is very difficult to measure reference level involute exactly. Nowadays the available methods for measuring precise involute include single base disc mode  electronic generation mode  and CNC three-coordinate mode. But measurement accuracy of the modes above is not suitable for reference level involute. A precise instrument for measuring reference level involute  double base discs instrument  is introduced. It is consistent with generation principle of the involute entirely. Besides having the advantages of single basic disc instrument  the instrument can remove Abbe error caused by the stylus  and has no pressure deforming. The instrument's structure is described. The main sources of measurement errors are analyzed and methods for compensation are presented. Finally  uncertainty of the instrument is given  which meets reference level involute test specification.  
ISOTHERMAL CRYSTALLIZATION OF LOW MOLECULAR WEIGHT POLY(ETHYLENE OXIDE) FRACTIONS IN QUASI-TWO-DIMENSIONAL SPACE 其他
2004-01-01
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收藏  |  浏览/下载：2/0  |  提交时间：2017/12/03

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