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Pore Structure Evolution in Sandstone of Underground Gas Storage during Cyclic Injection and Production Based on Nuclear Magnetic Resonance Technology 期刊论文  OAI收割
ENERGIES, 2023, 卷号: 16, 期号: 5, 页码: -
作者:  
Qiu, Xiaosong;  Liu, Hejuan;  Liu, Mancang;  Mao, Haijun;  Wang, Duocai
  |  收藏  |  浏览/下载:17/0  |  提交时间:2023/08/02
High resolution angle-resolved photoemission spectroscopy on Cu-based and Fe-based high-T-c superconductors 期刊论文  OAI收割
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, 2010, 卷号: 207, 期号: 12, 页码: 2674
Zhou, XJ; Liu, GD; Meng, JQ; Zhang, WT; Liu, HY; Zhao, L; Jia, XW
收藏  |  浏览/下载:24/0  |  提交时间:2013/09/17
Displacement estimation by the phase-shiftings of fourier transform in present white noise (EI CONFERENCE) 会议论文  OAI收割
ICO20: Optical Information Processing, August 21, 2005 - August 26, 2005, Changchun, China
作者:  
Wu Y.-H.
收藏  |  浏览/下载:29/0  |  提交时间:2013/03/25
Displacement estimation is a fundamental problem in Real-time video image processing. It can be typically approached by theories based on features in spatial domain. This paper presents an algorithm which improves the theory for estimating the moving object's displacement in spatial domain by its Fourier transform frequency spectrum. Because of the characters of Fourier transform  the result is based on all the features in the image. Utilizing shift theorem of Fourier transform and auto-registration  the algorithm employs the phase spectrum difference in polar coordinate of two frame images sequence with the moving target1  2. The method needn't transform frequency spectrum to spatial domain after calculation comparing with the traditional algorithm which has to search Direc peak  and it reduces processing time. Since the technique proposed uses all the image information  including all the white noise in the image especially  and it's hard to overcome the aliasing from noises  but the technique can be an effective way to analyze the result in little white noise by the different characters between high and low frequency bands. It can give the displacement of moving target within 1 pixel of accuracy. Experimental evidence of this performance is presented  and the mathematical reasons behind these characteristics are explained in depth. It is proved that the algorithm is fast and simple and can be used in image tracking and video image processing.  
Pressure effects on spectra of tunable laser crystal GSGG : Cr3+ - I: Theory 期刊论文  OAI收割
Communications in Theoretical Physics, 2003, 卷号: 39, 期号: 2, 页码: 249-256
D. P. Ma; J. P. Zhang
收藏  |  浏览/下载:22/0  |  提交时间:2012/04/14
Two-dimensional feature of the Nernst effect in normal state of underdoped La2-xSrxCuO4 single crystals 期刊论文  OAI收割
EUROPHYSICS LETTERS, 2003, 卷号: 63, 期号: 4, 页码: 583
Wen, HH; Liu, ZY; Xu, ZA; Weng, ZY; Zhou, F; Zhao, ZX
收藏  |  浏览/下载:17/0  |  提交时间:2013/09/23